diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/gdk/cdgdk.c | 707 | ||||
| -rw-r--r-- | src/gdk/cdgdk.h | 42 | ||||
| -rw-r--r-- | src/gdk/cdgdkdbuf.c | 6 | ||||
| -rw-r--r-- | src/gdk/cdgdkimg.c | 4 | ||||
| -rw-r--r-- | src/gdk/cdgdknative.c | 6 | ||||
| -rw-r--r-- | src/svg/base64.c | 231 | ||||
| -rw-r--r-- | src/svg/base64.h | 20 | ||||
| -rw-r--r-- | src/svg/cdsvg.c | 1003 | ||||
| -rw-r--r-- | src/svg/lodepng.c | 4319 | ||||
| -rw-r--r-- | src/svg/lodepng.h | 1708 |
10 files changed, 7630 insertions, 416 deletions
diff --git a/src/gdk/cdgdk.c b/src/gdk/cdgdk.c index 87a7a6c..e0692fc 100644 --- a/src/gdk/cdgdk.c +++ b/src/gdk/cdgdk.c @@ -14,17 +14,12 @@ #include <gdk/gdk.h> -#ifndef M_PI -#define M_PI 3.14159265358979323846 -#endif GdkColor (*cdgdkGetPixel)(cdCtxCanvas *ctxcanvas, unsigned long rgb); /* access to the color table */ void (*cdgdkGetRGB)(cdCtxCanvas *ctxcanvas, unsigned long pixel, unsigned char* red, unsigned char* green, unsigned char* blue); /* access to the color table */ -static GdkGCValues* gcval; - static int cdgdkDirectColorTable[256]; /* used with directColor visuals */ #define NUM_HATCHES 6 @@ -47,14 +42,12 @@ static char hatches[NUM_HATCHES][8] = { /******************************************************/ -/* Done! */ static void update_colors(cdCtxCanvas *ctxcanvas) { gboolean success; gdk_colormap_alloc_colors(ctxcanvas->colormap, ctxcanvas->color_table, ctxcanvas->num_colors, FALSE, TRUE, &success); } -/* Done! */ static int find_color(cdCtxCanvas *ctxcanvas, GdkColor xc1) { int pos = 0, i; @@ -82,7 +75,6 @@ static int find_color(cdCtxCanvas *ctxcanvas, GdkColor xc1) return pos; } -/* Done! */ /* Search the nearest RGB in the color table */ static unsigned long nearest_rgb(cdCtxCanvas *ctxcanvas, GdkColor clr) { @@ -117,7 +109,6 @@ static unsigned long nearest_rgb(cdCtxCanvas *ctxcanvas, GdkColor clr) return ctxcanvas->color_table[pos].pixel; } -/* Done! */ /* GetPixel using the conversion table. Used when the system is not True color. */ static GdkColor not_truecolor_get_pixel(cdCtxCanvas *ctxcanvas, unsigned long rgb) { @@ -142,7 +133,6 @@ static GdkColor not_truecolor_get_pixel(cdCtxCanvas *ctxcanvas, unsigned long rg return clr; } -/* Done! */ /* GetRGB using the conversion table. Used when the system is not True color. */ static void not_truecolor_get_rgb(cdCtxCanvas *ctxcanvas, unsigned long pixel, unsigned char* red, unsigned char* green, unsigned char* blue) { @@ -155,7 +145,6 @@ static void not_truecolor_get_rgb(cdCtxCanvas *ctxcanvas, unsigned long pixel, u *blue = cdCOLOR16TO8(clr.blue); } -/* Done! */ /* GetRGB function used in True color system. */ static void truecolor_get_rgb(cdCtxCanvas *ctxcanvas, unsigned long pixel, unsigned char* red, unsigned char* green, unsigned char* blue) { @@ -183,7 +172,6 @@ static void truecolor_get_rgb(cdCtxCanvas *ctxcanvas, unsigned long pixel, unsig *blue = cdCOLOR16TO8(b); } -/* Done! */ /* GetPixel function used in TrueColor mode. */ static GdkColor truecolor_get_pixel(cdCtxCanvas *ctxcanvas, unsigned long rgb) { @@ -193,29 +181,30 @@ static GdkColor truecolor_get_pixel(cdCtxCanvas *ctxcanvas, unsigned long rgb) clrRGB.green = cdCOLOR8TO16(cdGreen(rgb)); clrRGB.blue = cdCOLOR8TO16(cdBlue(rgb)); - if (ctxcanvas->rshift < 0) - clrRGB.red = clrRGB.red << (-ctxcanvas->rshift); - else - clrRGB.red = clrRGB.red >> ctxcanvas->rshift; - - if (ctxcanvas->gshift < 0) - clrRGB.green = clrRGB.green << (-ctxcanvas->gshift); - else - clrRGB.green = clrRGB.green >> ctxcanvas->gshift; - - if (ctxcanvas->bshift < 0) - clrRGB.blue = clrRGB.blue << (-ctxcanvas->bshift); - else - clrRGB.blue = clrRGB.blue >> ctxcanvas->bshift; + (void)ctxcanvas; - clrRGB.red = clrRGB.red & ctxcanvas->vis->red_mask; - clrRGB.green = clrRGB.green & ctxcanvas->vis->green_mask; - clrRGB.blue = clrRGB.blue & ctxcanvas->vis->blue_mask; + //if (ctxcanvas->rshift < 0) + // clrRGB.red = clrRGB.red << (-ctxcanvas->rshift); + //else + // clrRGB.red = clrRGB.red >> ctxcanvas->rshift; + + //if (ctxcanvas->gshift < 0) + // clrRGB.green = clrRGB.green << (-ctxcanvas->gshift); + //else + // clrRGB.green = clrRGB.green >> ctxcanvas->gshift; + + //if (ctxcanvas->bshift < 0) + // clrRGB.blue = clrRGB.blue << (-ctxcanvas->bshift); + //else + // clrRGB.blue = clrRGB.blue >> ctxcanvas->bshift; + + //clrRGB.red = clrRGB.red & ctxcanvas->vis->red_mask; + //clrRGB.green = clrRGB.green & ctxcanvas->vis->green_mask; + //clrRGB.blue = clrRGB.blue & ctxcanvas->vis->blue_mask; return clrRGB; } -/* Done! */ /* Returns position of highest set bit in 'ul' as an integer (0-31), or -1 if none */ static int highbit(unsigned long ul) { @@ -307,7 +296,7 @@ static void makeDirectCmap(cdCtxCanvas *ctxcanvas, GdkColormap* cmap) /******************************************************/ -void cdxKillCanvas(cdCtxCanvas *ctxcanvas) +void cdgdkKillCanvas(cdCtxCanvas *ctxcanvas) { if (ctxcanvas->canvas->bpp <= 8) { @@ -319,7 +308,7 @@ void cdxKillCanvas(cdCtxCanvas *ctxcanvas) } if (ctxcanvas->xidata) free(ctxcanvas->xidata); - if (ctxcanvas->font) g_object_unref(ctxcanvas->font); + if (ctxcanvas->font) cairo_scaled_font_destroy(ctxcanvas->font); if (ctxcanvas->last_hatch) g_object_unref(ctxcanvas->last_hatch); if (ctxcanvas->clip_polygon) g_object_unref(ctxcanvas->clip_polygon); @@ -349,7 +338,6 @@ void cdxKillCanvas(cdCtxCanvas *ctxcanvas) /******************************************************/ -/* done! */ static void cdflush(cdCtxCanvas *ctxcanvas) { (void)ctxcanvas; @@ -358,21 +346,18 @@ static void cdflush(cdCtxCanvas *ctxcanvas) /******************************************************/ -/* Done! */ static GdkPixmap* build_clip_polygon(cdCtxCanvas *ctxcanvas, GdkPoint* pnt, int n) { GdkPixmap *pix = gdk_pixmap_new(ctxcanvas->wnd, ctxcanvas->canvas->w, ctxcanvas->canvas->h, 1); GdkGC *gc = gdk_gc_new((GdkDrawable*)pix); - GdkGCValues values; - - gdk_gc_get_values(gc, &values); + GdkColor clr; - values.foreground.pixel = 0; - gdk_gc_set_foreground(gc, &values.foreground); + clr.pixel = 0; + gdk_gc_set_foreground(gc, &clr); gdk_draw_rectangle(pix, gc, TRUE, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h); - values.foreground.pixel = 1; - gdk_gc_set_foreground(gc, &values.foreground); + clr.pixel = 1; + gdk_gc_set_foreground(gc, &clr); gdk_region_polygon(pnt, n, ctxcanvas->canvas->fill_mode == CD_EVENODD ? GDK_EVEN_ODD_RULE : GDK_WINDING_RULE); gdk_draw_polygon(pix, gc, TRUE, pnt, n); @@ -381,7 +366,6 @@ static GdkPixmap* build_clip_polygon(cdCtxCanvas *ctxcanvas, GdkPoint* pnt, int return pix; } -/* Done! */ static void gdksetclip_area(cdCtxCanvas *ctxcanvas) { cdRect* clip_rect = &ctxcanvas->canvas->clip_rect; @@ -392,7 +376,7 @@ static void gdksetclip_area(cdCtxCanvas *ctxcanvas) poly[1].x = clip_rect->xmin; poly[1].y = clip_rect->ymax; poly[2].x = clip_rect->xmax; poly[2].y = clip_rect->ymax; poly[3].x = clip_rect->xmax; poly[3].y = clip_rect->ymin; - ctxcanvas->canvas->cxPoly(ctxcanvas, CD_CLIP, poly, 4); // VER ISSO!!!! + ctxcanvas->canvas->cxPoly(ctxcanvas, CD_CLIP, poly, 4); } else { @@ -405,7 +389,6 @@ static void gdksetclip_area(cdCtxCanvas *ctxcanvas) } } -/* Done! */ int cdgdkClip(cdCtxCanvas *ctxcanvas, int clip_mode) { switch (clip_mode) @@ -428,7 +411,6 @@ int cdgdkClip(cdCtxCanvas *ctxcanvas, int clip_mode) return clip_mode; } -/* Done! */ static void cdcliparea(cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax) { if (ctxcanvas->canvas->clip_mode == CD_CLIPAREA) @@ -441,10 +423,9 @@ static void cdcliparea(cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int } } -/* Done! */ static void cdnewregion(cdCtxCanvas *ctxcanvas) { - GdkGCValues values; + GdkColor clr; if (ctxcanvas->new_region) { @@ -458,10 +439,9 @@ static void cdnewregion(cdCtxCanvas *ctxcanvas) { GdkGC* gc = gdk_gc_new((GdkDrawable*)ctxcanvas->new_region); - gdk_gc_get_values(gc, &values); + clr.pixel = 0; + gdk_gc_set_foreground(gc, &clr); - values.foreground.pixel = 0; - gdk_gc_set_foreground(gc, &values.foreground); gdk_draw_rectangle(ctxcanvas->new_region, gc, TRUE, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h); g_object_unref(gc); @@ -470,12 +450,10 @@ static void cdnewregion(cdCtxCanvas *ctxcanvas) ctxcanvas->region_aux = gdk_pixmap_new(ctxcanvas->wnd, ctxcanvas->canvas->w, ctxcanvas->canvas->h, 1); ctxcanvas->region_aux_gc = gdk_gc_new((GdkDrawable*)ctxcanvas->region_aux); - gdk_gc_get_values(ctxcanvas->region_aux_gc, &values); - values.background.pixel = 0; - gdk_gc_set_background(ctxcanvas->region_aux_gc, &values.background); + clr.pixel = 0; + gdk_gc_set_background(ctxcanvas->region_aux_gc, &clr); } -/* Done! */ static int cdispointinregion(cdCtxCanvas *ctxcanvas, int x, int y) { if (!ctxcanvas->new_region) @@ -484,7 +462,7 @@ static int cdispointinregion(cdCtxCanvas *ctxcanvas, int x, int y) if (x >= 0 && y >= 0 && x < ctxcanvas->canvas->w && y < ctxcanvas->canvas->h) { long p; - GdkImage* img = gdk_drawable_get_image((GdkDrawable*)ctxcanvas->new_region, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h); // 1, XYPixmap; + GdkImage* img = gdk_drawable_get_image((GdkDrawable*)ctxcanvas->new_region, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h); p = gdk_image_get_pixel(img, x, y); g_object_unref(img); @@ -496,7 +474,6 @@ static int cdispointinregion(cdCtxCanvas *ctxcanvas, int x, int y) return 0; } -/* Done! */ static void cdgetregionbox(cdCtxCanvas *ctxcanvas, int *xmin, int *xmax, int *ymin, int *ymax) { if (!ctxcanvas->new_region) @@ -510,7 +487,7 @@ static void cdgetregionbox(cdCtxCanvas *ctxcanvas, int *xmin, int *xmax, int *ym { int x, y; long p; - GdkImage* img = gdk_drawable_get_image((GdkDrawable*)ctxcanvas->new_region, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h); // 1, XYPixmap + GdkImage* img = gdk_drawable_get_image((GdkDrawable*)ctxcanvas->new_region, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h); for (y = 0; y < ctxcanvas->canvas->h; y++) { @@ -550,28 +527,24 @@ static void cdgetregionbox(cdCtxCanvas *ctxcanvas, int *xmin, int *xmax, int *ym } } -/* Done! */ static void sPrepareRegion(cdCtxCanvas *ctxcanvas) { - GdkGCValues values; + GdkColor clr; if (!ctxcanvas->new_region) return; - gdk_gc_get_values(ctxcanvas->region_aux_gc, &values); - gdk_gc_set_function(ctxcanvas->region_aux_gc, GDK_COPY); - values.foreground.pixel = 0; - gdk_gc_set_foreground(ctxcanvas->region_aux_gc, &values.foreground); + clr.pixel = 0; + gdk_gc_set_foreground(ctxcanvas->region_aux_gc, &clr); gdk_draw_rectangle(ctxcanvas->region_aux, ctxcanvas->region_aux_gc, TRUE, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h); - values.foreground.pixel = 1; - gdk_gc_set_foreground(ctxcanvas->region_aux_gc, &values.foreground); + clr.pixel = 1; + gdk_gc_set_foreground(ctxcanvas->region_aux_gc, &clr); } -/* Done! */ static void sCombineRegion(cdCtxCanvas *ctxcanvas) { switch(ctxcanvas->canvas->combine_mode) @@ -595,7 +568,6 @@ static void sCombineRegion(cdCtxCanvas *ctxcanvas) ctxcanvas->canvas->w, ctxcanvas->canvas->h); } -/* Done! */ static void cdoffsetregion(cdCtxCanvas *ctxcanvas, int x, int y) { if (!ctxcanvas->new_region) @@ -614,26 +586,24 @@ static void cdoffsetregion(cdCtxCanvas *ctxcanvas, int x, int y) /******************************************************/ -/* Done! */ static int cdwritemode(cdCtxCanvas *ctxcanvas, int write_mode) { switch (write_mode) { case CD_REPLACE: - gdk_gc_set_function(ctxcanvas->region_aux_gc, GDK_COPY); + gdk_gc_set_function(ctxcanvas->gc, GDK_COPY); break; case CD_XOR: - gdk_gc_set_function(ctxcanvas->region_aux_gc, GDK_XOR); + gdk_gc_set_function(ctxcanvas->gc, GDK_XOR); break; case CD_NOT_XOR: - gdk_gc_set_function(ctxcanvas->region_aux_gc, GDK_EQUIV); + gdk_gc_set_function(ctxcanvas->gc, GDK_EQUIV); break; } return write_mode; } -/* Done! */ static int cdinteriorstyle(cdCtxCanvas *ctxcanvas, int style) { GdkFill sty = GDK_SOLID; @@ -676,7 +646,6 @@ static int cdinteriorstyle(cdCtxCanvas *ctxcanvas, int style) return style; } -/* Done! */ static int cdhatch(cdCtxCanvas *ctxcanvas, int hatch_style) { GdkColor fg, bg; @@ -695,7 +664,6 @@ static int cdhatch(cdCtxCanvas *ctxcanvas, int hatch_style) return hatch_style; } -/* Done! */ static void cdstipple(cdCtxCanvas *ctxcanvas, int w, int h, const unsigned char *data) { int x, y; @@ -721,16 +689,14 @@ static void cdstipple(cdCtxCanvas *ctxcanvas, int w, int h, const unsigned char { for (x = 0; x < w; x++) { - GdkGCValues values; - - gdk_gc_get_values(ctxcanvas->last_stipple_gc, &values); + GdkColor clr; if(data[y*w+x]) - values.foreground.pixel = 1; + clr.pixel = 1; else - values.foreground.pixel = 0; + clr.pixel = 0; - gdk_gc_set_foreground(ctxcanvas->last_stipple_gc, &values.foreground); + gdk_gc_set_foreground(ctxcanvas->last_stipple_gc, &clr); gdk_draw_point(ctxcanvas->last_stipple, ctxcanvas->last_stipple_gc, x, h-y-1); } } @@ -738,7 +704,6 @@ static void cdstipple(cdCtxCanvas *ctxcanvas, int w, int h, const unsigned char cdinteriorstyle(ctxcanvas, CD_STIPPLE); } -/* Done! */ static int find_match(unsigned long* palette, int pal_size, unsigned long color, unsigned char *match) { int i; @@ -755,12 +720,11 @@ static int find_match(unsigned long* palette, int pal_size, unsigned long color, return 0; } -/* Done! */ static void cdpattern(cdCtxCanvas *ctxcanvas, int w, int h, const long int *colors) { int x, y, i; int size = w*h; - GdkColor *pixels = NULL; + GdkColor *pixels = g_new (GdkColor, size); if (ctxcanvas->last_pattern == 0 || (ctxcanvas->last_pattern_w != w || ctxcanvas->last_pattern_h != h)) { @@ -774,14 +738,14 @@ static void cdpattern(cdCtxCanvas *ctxcanvas, int w, int h, const long int *colo if (!ctxcanvas->last_pattern) return; - ctxcanvas->last_stipple_gc = gdk_gc_new((GdkDrawable*)ctxcanvas->last_pattern); + ctxcanvas->last_pattern_gc = gdk_gc_new((GdkDrawable*)ctxcanvas->last_pattern); ctxcanvas->last_pattern_w = w; ctxcanvas->last_pattern_h = h; } if (ctxcanvas->canvas->bpp <= 8) { - GdkColor* match_table = NULL; /* GDK colors */ + GdkColor* match_table; /* GDK colors */ unsigned long palette[256]; /* CD colors */ unsigned char *index = (unsigned char*)malloc(size), match; int pal_size = 1; @@ -804,6 +768,7 @@ static void cdpattern(cdCtxCanvas *ctxcanvas, int w, int h, const long int *colo } /* CD colors to GDK colors */ + match_table = g_new (GdkColor, pal_size); for (i = 0; i < pal_size; i++) match_table[i] = cdgdkGetPixel(ctxcanvas, palette[i]); @@ -811,6 +776,7 @@ static void cdpattern(cdCtxCanvas *ctxcanvas, int w, int h, const long int *colo for (i = 0; i < size; i++) pixels[i] = match_table[index[i]]; + g_free(match_table); free(index); } else @@ -823,26 +789,21 @@ static void cdpattern(cdCtxCanvas *ctxcanvas, int w, int h, const long int *colo { for (x = 0; x < w; x++) { - GdkGCValues values; - - gdk_gc_get_values(ctxcanvas->last_pattern_gc, &values); - values.foreground = pixels[y*w+x]; - - gdk_gc_set_foreground(ctxcanvas->last_pattern_gc, &values.foreground); + gdk_gc_set_rgb_fg_color(ctxcanvas->last_pattern_gc, &pixels[y*w+x]); gdk_draw_point(ctxcanvas->last_pattern, ctxcanvas->last_pattern_gc, x, h-y-1); } } cdinteriorstyle(ctxcanvas, CD_PATTERN); + g_free(pixels); } -/* Done! */ static int cdlinestyle(cdCtxCanvas *ctxcanvas, int style) { switch (style) { case CD_CONTINUOUS: - gcval->line_style = GDK_LINE_SOLID; + ctxcanvas->gcval.line_style = GDK_LINE_SOLID; break; case CD_DASHED: case CD_DOTTED: @@ -860,9 +821,9 @@ static int cdlinestyle(cdCtxCanvas *ctxcanvas, int style) }; if (ctxcanvas->canvas->back_opacity == CD_OPAQUE) - gcval->line_style = GDK_LINE_DOUBLE_DASH; + ctxcanvas->gcval.line_style = GDK_LINE_DOUBLE_DASH; else - gcval->line_style = GDK_LINE_ON_OFF_DASH; + ctxcanvas->gcval.line_style = GDK_LINE_ON_OFF_DASH; gdk_gc_set_dashes(ctxcanvas->gc, 0, dashes[style-CD_DASHED].list, dashes[style-CD_DASHED].size); break; @@ -875,9 +836,9 @@ static int cdlinestyle(cdCtxCanvas *ctxcanvas, int style) dash_style[i] = (char)ctxcanvas->canvas->line_dashes[i]; if (ctxcanvas->canvas->back_opacity == CD_OPAQUE) - gcval->line_style = GDK_LINE_DOUBLE_DASH; + ctxcanvas->gcval.line_style = GDK_LINE_DOUBLE_DASH; else - gcval->line_style = GDK_LINE_ON_OFF_DASH; + ctxcanvas->gcval.line_style = GDK_LINE_ON_OFF_DASH; gdk_gc_set_dashes(ctxcanvas->gc, 0, dash_style, ctxcanvas->canvas->line_dashes_count); free(dash_style); @@ -885,47 +846,43 @@ static int cdlinestyle(cdCtxCanvas *ctxcanvas, int style) } } - gdk_gc_set_values(ctxcanvas->gc, gcval, GDK_GC_LINE_STYLE); + gdk_gc_set_values(ctxcanvas->gc, &ctxcanvas->gcval, GDK_GC_LINE_STYLE); return style; } -/* Done! */ static int cdlinewidth(cdCtxCanvas *ctxcanvas, int width) { if (width == 1) - gcval->line_width = 0; + ctxcanvas->gcval.line_width = 0; else - gcval->line_width = width; + ctxcanvas->gcval.line_width = width; - gdk_gc_set_values(ctxcanvas->gc, gcval, GDK_GC_LINE_WIDTH); + gdk_gc_set_values(ctxcanvas->gc, &ctxcanvas->gcval, GDK_GC_LINE_WIDTH); return width; } -/* Done! */ static int cdlinecap(cdCtxCanvas *ctxcanvas, int cap) { int cd2x_cap[] = {GDK_CAP_BUTT, GDK_CAP_PROJECTING, GDK_CAP_ROUND}; - gcval->cap_style = cd2x_cap[cap]; - gdk_gc_set_values(ctxcanvas->gc, gcval, GDK_GC_CAP_STYLE); + ctxcanvas->gcval.cap_style = cd2x_cap[cap]; + gdk_gc_set_values(ctxcanvas->gc, &ctxcanvas->gcval, GDK_GC_CAP_STYLE); return cap; } -/* Done! */ static int cdlinejoin(cdCtxCanvas *ctxcanvas, int join) { int cd2x_join[] = {GDK_JOIN_MITER, GDK_JOIN_BEVEL, GDK_JOIN_ROUND}; - gcval->join_style = cd2x_join[join]; - gdk_gc_set_values(ctxcanvas->gc, gcval, GDK_GC_JOIN_STYLE); + ctxcanvas->gcval.join_style = cd2x_join[join]; + gdk_gc_set_values(ctxcanvas->gc, &ctxcanvas->gcval, GDK_GC_JOIN_STYLE); return join; } -/* Done! */ static int cdbackopacity(cdCtxCanvas *ctxcanvas, int opaque) { ctxcanvas->canvas->back_opacity = opaque; @@ -934,13 +891,10 @@ static int cdbackopacity(cdCtxCanvas *ctxcanvas, int opaque) return opaque; } -/* done! */ static int cdfont(cdCtxCanvas *ctxcanvas, const char *type_face, int style, int size) { cairo_t* crWnd = gdk_cairo_create(ctxcanvas->wnd); - cairo_font_face_t *font; - char font_name[1024]; - char* foundry = "*"; + cairo_scaled_font_t *font; cairo_font_slant_t slant = CAIRO_FONT_SLANT_NORMAL; /* default is */ cairo_font_weight_t weight = CAIRO_FONT_WEIGHT_NORMAL; /* CD_PLAIN */ @@ -953,44 +907,34 @@ static int cdfont(cdCtxCanvas *ctxcanvas, const char *type_face, int style, int else if (cdStrEqualNoCase(type_face, "Sans") || cdStrEqualNoCase(type_face, "Arial")) type_face = "helvetica"; - if (cdStrEqualNoCase(type_face, "Fixed")) - foundry = "misc"; - /* no underline or strikeout support */ - if (style&CD_BOLD) + if (style & CD_BOLD) weight = CAIRO_FONT_WEIGHT_BOLD; - if (style&CD_ITALIC) + if (style & CD_ITALIC) slant = CAIRO_FONT_SLANT_ITALIC; - if (style&CD_BOLD_ITALIC) - { - slant = CAIRO_FONT_SLANT_ITALIC; - weight = CAIRO_FONT_WEIGHT_BOLD; - } - - size = cdGetFontSizePoints(ctxcanvas->canvas, size); - size *= 10; /* convert to deci-points */ + cairo_select_font_face(crWnd, type_face, slant, weight); + cairo_set_font_size(crWnd, (double)cdGetFontSizePixels(ctxcanvas->canvas, size)); - sprintf(font_name,"-%s-%s-*-*-*-*-*-*-*-*-*-*-*", foundry, type_face); - - font = cairo_toy_font_face_create(font_name, slant, weight); + font = cairo_get_scaled_font(crWnd); if (!font) return 0; if (ctxcanvas->font) - cairo_font_face_destroy(ctxcanvas->font); + cairo_scaled_font_destroy(ctxcanvas->font); + + font = cairo_scaled_font_reference(font); ctxcanvas->font = font; - cairo_set_font_face(crWnd, ctxcanvas->font); - cairo_set_font_size(crWnd, size); + + cairo_destroy(crWnd); return 1; } -/* done! */ static int cdnativefont(cdCtxCanvas *ctxcanvas, const char* nativefont) { int size = 12, style = CD_PLAIN; @@ -999,22 +943,28 @@ static int cdnativefont(cdCtxCanvas *ctxcanvas, const char* nativefont) if (nativefont[0] == '-') { - cairo_font_face_t *font = cairo_toy_font_face_create(nativefont, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL); + cairo_scaled_font_t *font; + + cairo_select_font_face(crWnd, nativefont, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL); + cairo_set_font_size(crWnd, (double)cdGetFontSizePixels(ctxcanvas->canvas, size)); + + font = cairo_get_scaled_font(crWnd); if (!font) return 0; if (!cdParseXWinFont(nativefont, type_face, &style, &size)) { - cairo_font_face_destroy(font); + cairo_scaled_font_destroy(font); return 0; } if (ctxcanvas->font) - cairo_font_face_destroy(font); - + cairo_scaled_font_destroy(ctxcanvas->font); + ctxcanvas->font = font; - cairo_set_font_face(crWnd, ctxcanvas->font); + + cairo_set_scaled_font(crWnd, ctxcanvas->font); } else { @@ -1030,10 +980,11 @@ static int cdnativefont(cdCtxCanvas *ctxcanvas, const char* nativefont) ctxcanvas->canvas->font_size = size; strcpy(ctxcanvas->canvas->font_type_face, type_face); + cairo_destroy(crWnd); + return 1; } -/* done! */ static void cdgetfontdim(cdCtxCanvas *ctxcanvas, int *max_width, int *height, int *ascent, int *descent) { cairo_t* crWnd = gdk_cairo_create(ctxcanvas->wnd); @@ -1042,35 +993,38 @@ static void cdgetfontdim(cdCtxCanvas *ctxcanvas, int *max_width, int *height, in if (!ctxcanvas->font) return; - cairo_set_font_face(crWnd, ctxcanvas->font); + cairo_set_scaled_font(crWnd, ctxcanvas->font); cairo_font_extents(crWnd, &extents); if (max_width) *max_width = (int)extents.max_x_advance; if (height) *height = (int)extents.height; if (ascent) *ascent = (int)extents.ascent; if (descent) *descent = (int)extents.descent; + + cairo_destroy(crWnd); } -/* done! */ static long int cdbackground(cdCtxCanvas *ctxcanvas, long int color) { - GdkColor clr = cdgdkGetPixel(ctxcanvas, color); - gdk_gc_set_background(ctxcanvas->gc, &clr); + ctxcanvas->bg = cdgdkGetPixel(ctxcanvas, color); + gdk_gc_set_rgb_bg_color(ctxcanvas->gc, &ctxcanvas->bg); return color; } -/* done! */ static long int cdforeground(cdCtxCanvas *ctxcanvas, long int color) { ctxcanvas->fg = cdgdkGetPixel(ctxcanvas, color); - gdk_gc_set_foreground(ctxcanvas->gc, &ctxcanvas->fg); + gdk_gc_set_rgb_fg_color(ctxcanvas->gc, &ctxcanvas->fg); return color; } -/* done! */ static void cdpalette(cdCtxCanvas *ctxcanvas, int n, const long int *palette, int mode) { int i; + GdkColor *pixels = g_new (GdkColor, 256); + + for(i = 0; i < ctxcanvas->num_colors; i++) + pixels[i] = ctxcanvas->color_table[i]; gdk_colormap_free_colors(ctxcanvas->colormap, ctxcanvas->color_table, ctxcanvas->num_colors); @@ -1096,7 +1050,7 @@ static void cdpalette(cdCtxCanvas *ctxcanvas, int n, const long int *palette, in gdk_colormap_alloc_colors(gdk_colormap_get_system(), ctxcanvas->color_table, tokeep, FALSE, TRUE, &success); - /* reserve these colors to the CD use too */ + /* reserve these colors to use in CD */ for (i=0; i<tokeep; i++) gdk_colormap_alloc_color(ctxcanvas->colormap, &(ctxcanvas->color_table[i]), FALSE, TRUE); } @@ -1131,11 +1085,12 @@ static void cdpalette(cdCtxCanvas *ctxcanvas, int n, const long int *palette, in for (i = 0; i < n; i++) cdgdkGetPixel(ctxcanvas, palette[i]); } + + g_free(pixels); } /******************************************************/ -/* done! */ static void cdgdkCheckSolidStyle(cdCtxCanvas *ctxcanvas, int set) { if (ctxcanvas->canvas->interior_style == CD_SOLID) @@ -1147,7 +1102,6 @@ static void cdgdkCheckSolidStyle(cdCtxCanvas *ctxcanvas, int set) cdinteriorstyle(ctxcanvas, ctxcanvas->canvas->interior_style); } -/* done! */ static void cdclear(cdCtxCanvas* ctxcanvas) { GdkColor clr; @@ -1155,17 +1109,16 @@ static void cdclear(cdCtxCanvas* ctxcanvas) cdgdkCheckSolidStyle(ctxcanvas, 1); clr = cdgdkGetPixel(ctxcanvas, ctxcanvas->canvas->background); - gdk_gc_set_foreground(ctxcanvas->gc, &clr); + gdk_gc_set_rgb_fg_color(ctxcanvas->gc, &clr); gdk_draw_rectangle(ctxcanvas->wnd, ctxcanvas->gc, TRUE, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h); - + clr = cdgdkGetPixel(ctxcanvas, ctxcanvas->canvas->foreground); - gdk_gc_set_foreground(ctxcanvas->gc, &clr); + gdk_gc_set_rgb_fg_color(ctxcanvas->gc, &clr); cdgdkCheckSolidStyle(ctxcanvas, 0); } -/* done! */ static void cdline(cdCtxCanvas *ctxcanvas, int x1, int y1, int x2, int y2) { if (ctxcanvas->canvas->use_matrix) @@ -1179,7 +1132,6 @@ static void cdline(cdCtxCanvas *ctxcanvas, int x1, int y1, int x2, int y2) cdgdkCheckSolidStyle(ctxcanvas, 0); } -/* Done! */ static void cdarc(cdCtxCanvas *ctxcanvas, int xc, int yc, int w, int h, double a1, double a2) { if (ctxcanvas->canvas->use_matrix) @@ -1193,7 +1145,6 @@ static void cdarc(cdCtxCanvas *ctxcanvas, int xc, int yc, int w, int h, double a cdgdkCheckSolidStyle(ctxcanvas, 0); } -/* Done! */ static void cdsector(cdCtxCanvas *ctxcanvas, int xc, int yc, int w, int h, double a1, double a2) { if (ctxcanvas->canvas->use_matrix) @@ -1216,7 +1167,6 @@ static void cdsector(cdCtxCanvas *ctxcanvas, int xc, int yc, int w, int h, doubl } } -/* Done! */ static void cdchord(cdCtxCanvas *ctxcanvas, int xc, int yc, int w, int h, double a1, double a2) { if (ctxcanvas->canvas->new_region) @@ -1231,7 +1181,6 @@ static void cdchord(cdCtxCanvas *ctxcanvas, int xc, int yc, int w, int h, double } } -/* Done! */ static void cdrect(cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax) { if (ctxcanvas->canvas->use_matrix) @@ -1245,23 +1194,6 @@ static void cdrect(cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int yma cdgdkCheckSolidStyle(ctxcanvas, 0); } -static void cdrectCairo(cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax) -{ - if (ctxcanvas->canvas->use_matrix) - { - cdrectSIM(ctxcanvas, xmin, xmax, ymin, ymax); - return; - } - - cdgdkCheckSolidStyle(ctxcanvas, 1); - { - cairo_t* crWnd = gdk_cairo_create(ctxcanvas->wnd); - cairo_rectangle(crWnd, (double)xmin, (double)ymin, (double)(xmax-xmin), (double)(ymax-ymin)); - } - cdgdkCheckSolidStyle(ctxcanvas, 0); -} - -/* Done! */ static void cdbox(cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax) { if (ctxcanvas->canvas->use_matrix) @@ -1280,34 +1212,42 @@ static void cdbox(cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax gdk_draw_rectangle(ctxcanvas->wnd, ctxcanvas->gc, TRUE, xmin, ymin, xmax-xmin+1, ymax-ymin+1); } -/* done! */ static void cdtext(cdCtxCanvas *ctxcanvas, int x, int y, const char *s, int len) { - int dir = -1; - cairo_t* crWnd = gdk_cairo_create(ctxcanvas->wnd); - cairo_t* crWndAux = gdk_cairo_create((GdkDrawable*)ctxcanvas->region_aux); - cairo_matrix_t matrix; + cairo_t *crWnd; cairo_text_extents_t extents; cairo_font_extents_t font_extents; + const char *utf8_text; + + int dir = -1; + int x_origin = x; + int y_origin = y; - cairo_set_font_face(crWnd, ctxcanvas->font); - cairo_font_extents(crWnd, &font_extents); + if (!ctxcanvas->canvas->new_region) + crWnd = gdk_cairo_create(ctxcanvas->wnd); + else + crWnd = gdk_cairo_create((GdkDrawable*)ctxcanvas->region_aux); - cairo_text_extents (crWnd, s, &extents); + utf8_text = g_locale_to_utf8(s, len, NULL, 0, NULL); + cairo_set_scaled_font(crWnd, ctxcanvas->font); + + cairo_font_extents(crWnd, &font_extents); + cairo_text_extents(crWnd, utf8_text, &extents); + switch (ctxcanvas->canvas->text_alignment) { case CD_BASE_RIGHT: case CD_NORTH_EAST: case CD_EAST: case CD_SOUTH_EAST: - x = x - (int)extents.width; + x = x - (int)extents.width; break; case CD_BASE_CENTER: case CD_CENTER: case CD_NORTH: case CD_SOUTH: - x = x - (int)extents.width/2; + x = x - (int)(extents.width/2); break; case CD_BASE_LEFT: case CD_NORTH_WEST: @@ -1335,51 +1275,33 @@ static void cdtext(cdCtxCanvas *ctxcanvas, int x, int y, const char *s, int len) case CD_NORTH_EAST: case CD_NORTH: case CD_NORTH_WEST: - y = y + dir*((int)extents.height - (int)font_extents.descent); + y = y + dir*(int)(extents.height - font_extents.descent); break; case CD_CENTER: case CD_EAST: case CD_WEST: - y = y + dir*((int)extents.height/2 - (int)font_extents.descent); + y = y + dir*(int)(extents.height/2 - font_extents.descent); break; } if (ctxcanvas->canvas->text_orientation != 0) { - cdgdkCheckSolidStyle(ctxcanvas, 1); + cairo_matrix_t matrix; - if (ctxcanvas->canvas->use_matrix) - cdMatrixTransformPoint(ctxcanvas->xmatrix, x, y, &x, &y); - - if (ctxcanvas->canvas->new_region) - { - sPrepareRegion(ctxcanvas); + cairo_translate(crWnd, (double)x_origin, (double)y_origin); + cairo_get_matrix(crWnd, &matrix); - cairo_get_matrix(crWndAux, &matrix); + x -= ctxcanvas->canvas->w/2; + y -= ctxcanvas->canvas->h/2; - cairo_set_font_face(crWndAux, ctxcanvas->font); - cairo_move_to(crWndAux, (double)x, (double)(y)); - cairo_rotate(crWndAux, ctxcanvas->canvas->text_orientation * (M_PI/180)); - cairo_show_text(crWndAux, s); - cairo_set_matrix(crWndAux, &matrix); + cairo_matrix_rotate(&matrix, -ctxcanvas->canvas->text_orientation*CD_DEG2RAD); + cairo_matrix_translate(&matrix, (double)x, (double)y); - sCombineRegion(ctxcanvas); - } - else - { - cairo_get_matrix(crWnd, &matrix); - - cairo_set_font_face(crWnd, ctxcanvas->font); - cairo_move_to(crWnd, (double)x, (double)(y)); - cairo_rotate(crWnd, ctxcanvas->canvas->text_orientation * (M_PI/180)); - cairo_show_text(crWnd, s); - - cairo_set_matrix(crWnd, &matrix); - } - - cdgdkCheckSolidStyle(ctxcanvas, 0); - - return; + cairo_set_matrix(crWnd, &matrix); + } + else + { + cairo_move_to(crWnd, (double)x, (double)y); } cdgdkCheckSolidStyle(ctxcanvas, 1); @@ -1391,33 +1313,35 @@ static void cdtext(cdCtxCanvas *ctxcanvas, int x, int y, const char *s, int len) { sPrepareRegion(ctxcanvas); - cairo_set_font_face(crWndAux, ctxcanvas->font); - cairo_move_to(crWndAux, (double)x, (double)(y+1)); - cairo_show_text(crWndAux, s); + cairo_set_source_rgb(crWnd, 1.0, 1.0, 1.0); + cairo_show_text(crWnd, utf8_text); sCombineRegion(ctxcanvas); } else { - cairo_move_to(crWnd, (double)x, (double)(y+1)); - cairo_show_text(crWnd, s); + cairo_set_source_rgb(crWnd, ctxcanvas->fg.red/255, ctxcanvas->fg.green/255, ctxcanvas->fg.blue/255); + cairo_show_text(crWnd, utf8_text); } cdgdkCheckSolidStyle(ctxcanvas, 0); - (void)len; + cairo_destroy(crWnd); } -/* Done! */ static void cdgettextsize(cdCtxCanvas *ctxcanvas, const char *s, int len, int *width, int *height) { cairo_t* crWnd = gdk_cairo_create(ctxcanvas->wnd); cairo_text_extents_t extents; + const char *utf8_text; if (!ctxcanvas->font) return; - cairo_text_extents(crWnd, s, &extents); + utf8_text = g_locale_to_utf8(s, len, NULL, 0, NULL); + + cairo_set_scaled_font(crWnd, ctxcanvas->font); + cairo_text_extents(crWnd, utf8_text, &extents); if (width) *width = (int)extents.width; @@ -1425,87 +1349,88 @@ static void cdgettextsize(cdCtxCanvas *ctxcanvas, const char *s, int len, int *w if (height) *height = (int)extents.height; - (void)len; + cairo_destroy(crWnd); } -/* Done! */ void cdgdkPoly(cdCtxCanvas *ctxcanvas, int mode, cdPoint* poly, int n) { - int i; - GdkPoint *pnt = NULL; - - if (mode != CD_BEZIER) - { - for (i = 0; i < n; i++) - { - int x = poly[i].x, - y = poly[i].y; + int i; + GdkPoint* pnt; - if (ctxcanvas->canvas->use_matrix) - cdMatrixTransformPoint(ctxcanvas->xmatrix, x, y, &x, &y); - - pnt[i].x = (short)x; - pnt[i].y = (short)y; - } - } + pnt = g_new (GdkPoint, n); - switch( mode ) - { - case CD_FILL: - if (ctxcanvas->canvas->new_region) - { - sPrepareRegion(ctxcanvas); - gdk_region_polygon(pnt, n, ctxcanvas->canvas->fill_mode == CD_EVENODD ? GDK_EVEN_ODD_RULE : GDK_WINDING_RULE); - gdk_draw_polygon(ctxcanvas->region_aux, ctxcanvas->region_aux_gc, TRUE, pnt, n); - sCombineRegion(ctxcanvas); - } - else - { - gdk_region_polygon(pnt, n, ctxcanvas->canvas->fill_mode == CD_EVENODD ? GDK_EVEN_ODD_RULE : GDK_WINDING_RULE); - gdk_draw_polygon(ctxcanvas->wnd, ctxcanvas->gc, TRUE, pnt, n); - } - break; - - case CD_CLOSED_LINES: - pnt[n].x = pnt[0].x; - pnt[n].y = pnt[0].y; - n++; - /* continue... */ - - case CD_OPEN_LINES: - { - cdgdkCheckSolidStyle(ctxcanvas, 1); - gdk_draw_polygon(ctxcanvas->wnd, ctxcanvas->gc, FALSE, pnt, n); - cdgdkCheckSolidStyle(ctxcanvas, 0); - break; - } - - case CD_CLIP: - if (ctxcanvas->clip_polygon) - g_object_unref(ctxcanvas->clip_polygon); - - ctxcanvas->clip_polygon = build_clip_polygon(ctxcanvas, pnt, n); - - if (ctxcanvas->canvas->clip_mode == CD_CLIPPOLYGON) - cdgdkClip(ctxcanvas, CD_CLIPPOLYGON); - - break; - - case CD_BEZIER: - cdSimPolyBezier(ctxcanvas->canvas, poly, n); - break; - } + if(!pnt) + return; - g_object_unref(pnt); + if (mode != CD_BEZIER) + { + for (i = 0; i < n; i++) + { + int x = poly[i].x, + y = poly[i].y; + + if (ctxcanvas->canvas->use_matrix) + cdMatrixTransformPoint(ctxcanvas->xmatrix, x, y, &x, &y); + + pnt[i].x = (short)x; + pnt[i].y = (short)y; + } + } + + switch( mode ) + { + case CD_FILL: + if (ctxcanvas->canvas->new_region) + { + sPrepareRegion(ctxcanvas); + gdk_region_polygon(pnt, n, ctxcanvas->canvas->fill_mode == CD_EVENODD ? GDK_EVEN_ODD_RULE : GDK_WINDING_RULE); + gdk_draw_polygon(ctxcanvas->region_aux, ctxcanvas->region_aux_gc, TRUE, pnt, n); + sCombineRegion(ctxcanvas); + } + else + { + gdk_region_polygon(pnt, n, ctxcanvas->canvas->fill_mode == CD_EVENODD ? GDK_EVEN_ODD_RULE : GDK_WINDING_RULE); + gdk_draw_polygon(ctxcanvas->wnd, ctxcanvas->gc, TRUE, pnt, n); + } + break; + + case CD_CLOSED_LINES: + cdgdkCheckSolidStyle(ctxcanvas, 1); + gdk_draw_polygon(ctxcanvas->wnd, ctxcanvas->gc, FALSE, pnt, n); + cdgdkCheckSolidStyle(ctxcanvas, 0); + break; + + case CD_OPEN_LINES: + cdgdkCheckSolidStyle(ctxcanvas, 1); + gdk_draw_lines(ctxcanvas->wnd, ctxcanvas->gc, pnt, n); + cdgdkCheckSolidStyle(ctxcanvas, 0); + break; + + case CD_CLIP: + if (ctxcanvas->clip_polygon) + g_object_unref(ctxcanvas->clip_polygon); + + ctxcanvas->clip_polygon = build_clip_polygon(ctxcanvas, pnt, n); + + if (ctxcanvas->canvas->clip_mode == CD_CLIPPOLYGON) + cdgdkClip(ctxcanvas, CD_CLIPPOLYGON); + + break; + + case CD_BEZIER: + cdSimPolyBezier(ctxcanvas->canvas, poly, n); + break; + } + + g_free(pnt); } /******************************************************/ -/* done! */ static void cdgetimagergb(cdCtxCanvas *ctxcanvas, unsigned char *r, unsigned char *g, unsigned char *b, int x, int y, int w, int h) { int col, lin, pos; - GdkImage* xi = gdk_drawable_get_image(ctxcanvas->wnd, x, y-h+1, w, h); // ULONG_MAX, ZPixmap); + GdkImage* xi = gdk_drawable_get_image(ctxcanvas->wnd, x, y-h+1, w, h); if (!xi) { fprintf(stderr, "CanvasDraw: error getting image\n"); @@ -1524,7 +1449,6 @@ static void cdgetimagergb(cdCtxCanvas *ctxcanvas, unsigned char *r, unsigned cha g_object_unref(xi); } -/* done */ static long int* get_data_buffer(cdCtxCanvas *ctxcanvas, int size) { if (!ctxcanvas->xidata) @@ -1544,7 +1468,6 @@ static long int* get_data_buffer(cdCtxCanvas *ctxcanvas, int size) return ctxcanvas->xidata; } -/* done! */ static GdkImage *map2gdkImage(cdCtxCanvas *ctxcanvas, int ew, int eh, const unsigned char *index, const long int * colors, int by, int bx, int bw, int bh, int iw) { GdkColor** match_table = NULL; @@ -1622,13 +1545,9 @@ static GdkImage *map2gdkImage(cdCtxCanvas *ctxcanvas, int ew, int eh, const unsi if(xim) { - /* Conferir estes valores, ver se na hora da criação já não são eles próprios... */ xim->depth = (short)ctxcanvas->depth; xim->bpp = 32; xim->bpl = (short)imew; - // format = ZPixmap - // offset = 0; - // data = (char *)imagedata } } break; @@ -1658,13 +1577,9 @@ static GdkImage *map2gdkImage(cdCtxCanvas *ctxcanvas, int ew, int eh, const unsi if(xim) { - /* Conferir estes valores, ver se na hora da criação já não são eles próprios... */ xim->depth = (short)ctxcanvas->depth; xim->bpp = 16; xim->bpl = 0; - // format = ZPixmap - // offset = 0; - // data = (char *)imagedata } if (ctxcanvas->depth == 12 && xim->bits_per_pixel != 16) @@ -1723,13 +1638,9 @@ static GdkImage *map2gdkImage(cdCtxCanvas *ctxcanvas, int ew, int eh, const unsi if(xim) { - /* Conferir estes valores, ver se na hora da criação já não são eles próprios... */ xim->depth = (short)ctxcanvas->depth; xim->bpp = 32; xim->bpl = 0; - // format = ZPixmap - // offset = 0; - // data = (char *)imagedata } do32 = (xim->bits_per_pixel == 32 ? 1 : 0); @@ -1783,13 +1694,9 @@ static GdkImage *map2gdkImage(cdCtxCanvas *ctxcanvas, int ew, int eh, const unsi if(xim) { - /* Conferir estes valores, ver se na hora da criação já não são eles próprios... */ xim->depth = (short)ctxcanvas->depth; xim->bpp = 32; xim->bpl = (short)ew*4; - // format = ZPixmap - // offset = 0; - // data = (char *)imagedata } xim->bits_per_pixel = 32; @@ -1815,27 +1722,22 @@ static GdkImage *map2gdkImage(cdCtxCanvas *ctxcanvas, int ew, int eh, const unsi return(xim); } -/* done! */ static GdkImage *rgb2gdkImage(cdCtxCanvas *ctxcanvas, int ew, int eh, const unsigned char *red, const unsigned char *green, const unsigned char *blue, const unsigned char *alpha, GdkImage *oxi, int by, int bx, int bw, int bh, int iw) { -/* -* if we're displaying on a TrueColor -* or DirectColor display, we've got all the colors we're going to need, -* and 'all we have to do' is convert 24-bit RGB pixels into whatever -* variation of RGB the X device in question wants. No color allocation -* is involved. -*/ - int i,j; +/* if we're displaying on a TrueColor or DirectColor display, we've got all the colors we're going to need, + * and 'all we have to do' is convert 24-bit RGB pixels into whatever variation of RGB the X device in + * question wants. No color allocation is involved. + */ GdkImage *xim; + int *fx, *fy; + int i, j, maplen, src; + int rshift, gshift, bshift, bperpix, bperline, byte_order, cshift; unsigned long r, g, b, rmask, gmask, bmask, xcol; - int rshift, gshift, bshift, bperpix, bperline, byte_order, cshift; - int maplen, src; unsigned char *lip, *ip, *imagedata, or, ob, og, al; - int *fx, *fy; - + /* compute various shifting constants that we'll need... */ rmask = ctxcanvas->vis->red_mask; gmask = ctxcanvas->vis->green_mask; @@ -1843,12 +1745,12 @@ static GdkImage *rgb2gdkImage(cdCtxCanvas *ctxcanvas, int ew, int eh, rshift = 7 - highbit(rmask); gshift = 7 - highbit(gmask); bshift = 7 - highbit(bmask); - - maplen = ctxcanvas->vis->colormap_size; + maplen = ctxcanvas->vis->colormap_size; + if (maplen > 256) maplen = 256; - + cshift = 7 - highbit((unsigned long) (maplen-1)); xim = gdk_image_new(GDK_IMAGE_FASTEST, ctxcanvas->vis, ew, eh); @@ -1859,21 +1761,9 @@ static GdkImage *rgb2gdkImage(cdCtxCanvas *ctxcanvas, int ew, int eh, return NULL; } - if(xim) - { - /* Conferir estes valores, ver se na hora da criação já não são eles próprios... */ - xim->depth = (short)ctxcanvas->depth; - xim->bpp = 32; - xim->bpl = 0; - // format = ZPixmap - // offset = 0; - // data = NULL - } - - - bperline = xim->bpl; - bperpix = xim->bits_per_pixel; - byte_order = xim->byte_order; + bperline = xim->bpl; + bperpix = xim->bits_per_pixel; + byte_order = xim->byte_order; if (bperpix != 8 && bperpix != 16 && bperpix != 24 && bperpix != 32) { @@ -1893,11 +1783,11 @@ static GdkImage *rgb2gdkImage(cdCtxCanvas *ctxcanvas, int ew, int eh, fx = cdGetZoomTable(ew, bw, bx); fy = cdGetZoomTable(eh, bh, by); - lip = imagedata + (eh-1)*bperline; + lip = imagedata + (eh - 1) * bperline; - for (i=0; i<eh; i++, lip -= bperline) + for (i = 0; i < eh; i++, lip -= bperline) { - for (j=0, ip=lip; j<ew; j++) + for (j = 0, ip = lip; j < ew; j++) { src = fy[i]*iw + fx[j]; @@ -1916,11 +1806,9 @@ static GdkImage *rgb2gdkImage(cdCtxCanvas *ctxcanvas, int ew, int eh, b = blue[src]; } - /* shift r,g,b so that high bit of 8-bit color specification is - * aligned with high bit of r,g,b-mask in visual, - * AND each component with its mask, - * and OR the three components together - */ + /* shift r, g, b so that high bit of 8-bit color specification is aligned with + * high bit of r, g, b-mask in visual, AND each component with its mask, and + * OR the three components together */ if(gdk_visual_get_best_type() == GDK_VISUAL_DIRECT_COLOR) { r = (unsigned long) cdgdkDirectColorTable[(r>>cshift) & 0xff] << cshift; @@ -1929,14 +1817,20 @@ static GdkImage *rgb2gdkImage(cdCtxCanvas *ctxcanvas, int ew, int eh, } /* shift the bits around */ - if (rshift < 0) r = r << (-rshift); - else r = r >> rshift; + if (rshift < 0) + r = r << (-rshift); + else + r = r >> rshift; - if (gshift < 0) g = g << (-gshift); - else g = g >> gshift; + if (gshift < 0) + g = g << (-gshift); + else + g = g >> gshift; - if (bshift < 0) b = b << (-bshift); - else b = b >> bshift; + if (bshift < 0) + b = b << (-bshift); + else + b = b >> bshift; r = r & rmask; g = g & gmask; @@ -1994,14 +1888,16 @@ static GdkImage *rgb2gdkImage(cdCtxCanvas *ctxcanvas, int ew, int eh, } } } - + + /* Copy imagedata to GdkImage */ + memcpy (xim->mem, imagedata, eh * bperline); + free(fx); free(fy); return xim; } -/* done! */ static void cdputimagerectrgba_matrix(cdCtxCanvas* ctxcanvas, int iw, int ih, const unsigned char *r, const unsigned char *g, const unsigned char *b, const unsigned char *a, int x, int y, int w, int h, int xmin, int xmax, int ymin, int ymax) { int t_xmin, t_xmax, t_ymin, t_ymax, ew, eh, @@ -2058,7 +1954,7 @@ static void cdputimagerectrgba_matrix(cdCtxCanvas* ctxcanvas, int iw, int ih, co ey = t_ymin + eh-1; /* gdkImage origin is at top-left */ GdkImage *xi, *oxi = NULL; GdkPixmap *clip_polygon, *clip_mask = NULL; - GdkPoint* pnt = NULL; + GdkPoint* pnt = g_malloc(64); /* Since the transformation used was the original transformation, */ /* must invert the Y axis here. */ @@ -2089,7 +1985,7 @@ static void cdputimagerectrgba_matrix(cdCtxCanvas* ctxcanvas, int iw, int ih, co if (a) { - oxi = gdk_drawable_get_image(ctxcanvas->wnd, ex, ey, ew, eh); // ULONG_MAX, ZPixmap); + oxi = gdk_drawable_get_image(ctxcanvas->wnd, ex, ey, ew, eh); if (!oxi) { @@ -2112,12 +2008,13 @@ static void cdputimagerectrgba_matrix(cdCtxCanvas* ctxcanvas, int iw, int ih, co g_object_unref(xi); if (oxi) g_object_unref(oxi); + + g_free(pnt); } free(dst_r); } -/* done! */ static void cdputimagerectmap_matrix(cdCtxCanvas* ctxcanvas, int iw, int ih, const unsigned char *index, const long int *colors, int x, int y, int w, int h, int xmin, int xmax, int ymin, int ymax) { int t_xmin, t_xmax, t_ymin, t_ymax, ew, eh, @@ -2189,8 +2086,8 @@ static void cdputimagerectmap_matrix(cdCtxCanvas* ctxcanvas, int iw, int ih, con gdk_gc_set_function(ctxcanvas->gc, GDK_AND); gdk_draw_drawable((GdkDrawable*)clip_polygon, ctxcanvas->gc, - (GdkDrawable*)clip_mask, 0, 0, 0, 0, - ctxcanvas->canvas->w, ctxcanvas->canvas->h); + (GdkDrawable*)clip_mask, 0, 0, 0, 0, + ctxcanvas->canvas->w, ctxcanvas->canvas->h); gdk_gc_set_clip_mask(ctxcanvas->gc, (GdkBitmap*)clip_polygon); @@ -2212,7 +2109,6 @@ static void cdputimagerectmap_matrix(cdCtxCanvas* ctxcanvas, int iw, int ih, con free(dst_index); } -/* done! */ static void cdputimagerectrgb(cdCtxCanvas *ctxcanvas, int iw, int ih, const unsigned char *r, const unsigned char *g, const unsigned char *b, int x, int y, int w, int h, int xmin, int xmax, int ymin, int ymax) { int ew = w, eh = h, ex = x, ey = y; @@ -2245,7 +2141,6 @@ static void cdputimagerectrgb(cdCtxCanvas *ctxcanvas, int iw, int ih, const unsi g_object_unref(xi); } -/* done! */ static void cdputimagerectrgba(cdCtxCanvas *ctxcanvas, int iw, int ih, const unsigned char *r, const unsigned char *g, const unsigned char *b, const unsigned char *a, int x, int y, int w, int h, int xmin, int xmax, int ymin, int ymax) { GdkImage *xi, *oxi; @@ -2269,7 +2164,7 @@ static void cdputimagerectrgba(cdCtxCanvas *ctxcanvas, int iw, int ih, const uns if (!cdCalcZoom(ctxcanvas->canvas->h, y, h, &ey, &eh, ymin, rh, &by, &bh, 0)) return; - oxi = gdk_drawable_get_image(ctxcanvas->wnd, ex, ey, ew, eh); // ULONG_MAX, ZPixmap); + oxi = gdk_drawable_get_image(ctxcanvas->wnd, ex, ey, ew, eh); if (!oxi) { @@ -2287,7 +2182,6 @@ static void cdputimagerectrgba(cdCtxCanvas *ctxcanvas, int iw, int ih, const uns g_object_unref(oxi); } -/* done! */ static void cdputimagerectmap(cdCtxCanvas *ctxcanvas, int iw, int ih, const unsigned char *index, const long int *colors, int x, int y, int w, int h, int xmin, int xmax, int ymin, int ymax) { int ew = w, eh = h, ex = x, ey = y; @@ -2320,13 +2214,12 @@ static void cdputimagerectmap(cdCtxCanvas *ctxcanvas, int iw, int ih, const unsi g_object_unref(xi); } -/* done! */ static void cdpixel(cdCtxCanvas *ctxcanvas, int x, int y, long int color) { if (ctxcanvas->canvas->foreground != color) { GdkColor clr = cdgdkGetPixel(ctxcanvas, color); - gdk_gc_set_foreground(ctxcanvas->gc, &clr); + gdk_gc_set_rgb_fg_color(ctxcanvas->gc, &clr); } if (ctxcanvas->canvas->use_matrix) @@ -2336,10 +2229,9 @@ static void cdpixel(cdCtxCanvas *ctxcanvas, int x, int y, long int color) gdk_draw_point(ctxcanvas->wnd, ctxcanvas->gc, x, y); if (ctxcanvas->canvas->foreground != color) - gdk_gc_set_foreground(ctxcanvas->gc, &ctxcanvas->fg); + gdk_gc_set_rgb_fg_color(ctxcanvas->gc, &ctxcanvas->fg); } -/* done! */ static cdCtxImage *cdcreateimage (cdCtxCanvas *ctxcanvas, int w, int h) { GdkGC* gc; @@ -2364,7 +2256,7 @@ static cdCtxImage *cdcreateimage (cdCtxCanvas *ctxcanvas, int w, int h) clr = cdgdkGetPixel(ctxcanvas, CD_WHITE); - gdk_gc_set_foreground(gc, &clr); + gdk_gc_set_rgb_fg_color(gc, &clr); gdk_draw_rectangle(ctximage->img, gc, TRUE, 0, 0, ctximage->w, ctxcanvas->canvas->h); g_object_unref(gc); @@ -2372,7 +2264,6 @@ static cdCtxImage *cdcreateimage (cdCtxCanvas *ctxcanvas, int w, int h) return (void*)ctximage; } -/* done! */ static void cdgetimage (cdCtxCanvas *ctxcanvas, cdCtxImage *ctximage, int x, int y) { gdk_draw_drawable(ctximage->img, ctxcanvas->gc, @@ -2380,7 +2271,6 @@ static void cdgetimage (cdCtxCanvas *ctxcanvas, cdCtxImage *ctximage, int x, int ctximage->w, ctximage->h); } -/* done! */ static void cdputimagerect (cdCtxCanvas *ctxcanvas, cdCtxImage *ctximage, int x, int y, int xmin, int xmax, int ymin, int ymax) { gdk_draw_drawable(ctxcanvas->wnd, ctxcanvas->gc, @@ -2388,14 +2278,12 @@ static void cdputimagerect (cdCtxCanvas *ctxcanvas, cdCtxImage *ctximage, int x, xmax-xmin+1, ymax-ymin+1); } -/* done! */ static void cdkillimage (cdCtxImage *ctximage) { g_object_unref(ctximage->img); free(ctximage); } -/* done! */ static void cdscrollarea (cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax, int dx, int dy) { gdk_draw_drawable(ctxcanvas->wnd, ctxcanvas->gc, @@ -2403,7 +2291,6 @@ static void cdscrollarea (cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, xmax-xmin+1, ymax-ymin+1); } -/* done! */ static void cdtransform(cdCtxCanvas *ctxcanvas, const double* matrix) { if (matrix) @@ -2482,6 +2369,58 @@ static cdAttribute gc_attrib = get_gc_attrib }; +static void set_aa_attrib(cdCtxCanvas* ctxcanvas, char* data) +{ + cairo_t* crWnd = gdk_cairo_create(ctxcanvas->wnd); + cairo_font_options_t *crOptions = cairo_font_options_create(); + + cairo_scaled_font_get_font_options (ctxcanvas->font, crOptions); + + if (!data || data[0] == '0') + { + cairo_set_antialias(crWnd, CAIRO_ANTIALIAS_NONE); + cairo_font_options_set_antialias(crOptions, CAIRO_ANTIALIAS_NONE); + } + else + { + cairo_set_antialias(crWnd, CAIRO_ANTIALIAS_DEFAULT); + cairo_font_options_set_antialias(crOptions, CAIRO_ANTIALIAS_DEFAULT); + } + + cairo_font_options_destroy(crOptions); + cairo_destroy(crWnd); +} + +static char* get_aa_attrib(cdCtxCanvas* ctxcanvas) +{ + cairo_t* crWnd = gdk_cairo_create(ctxcanvas->wnd); + + if(cairo_get_antialias(crWnd) == CAIRO_ANTIALIAS_DEFAULT) + return "1"; + else + return "0"; +} + +static cdAttribute aa_attrib = +{ + "ANTIALIAS", + set_aa_attrib, + get_aa_attrib +}; + +static char* get_version_attrib(cdCtxCanvas* ctxcanvas) +{ + (void)ctxcanvas; + return (char*)cairo_version_string(); +} + +static cdAttribute version_attrib = +{ + "CAIROVERSION", + NULL, + get_version_attrib +}; + cdCtxCanvas *cdgdkCreateCanvas(cdCanvas* canvas, GdkDrawable* wnd, GdkScreen* scr, GdkVisual* vis) { static int first = 1; @@ -2501,6 +2440,8 @@ cdCtxCanvas *cdgdkCreateCanvas(cdCanvas* canvas, GdkDrawable* wnd, GdkScreen* sc return NULL; } + gdk_gc_set_colormap(ctxcanvas->gc, gdk_screen_get_default_colormap(ctxcanvas->scr)); + ctxcanvas->canvas = canvas; canvas->ctxcanvas = ctxcanvas; @@ -2509,7 +2450,7 @@ cdCtxCanvas *cdgdkCreateCanvas(cdCanvas* canvas, GdkDrawable* wnd, GdkScreen* sc canvas->bpp = ctxcanvas->depth; canvas->xres = ((double)gdk_screen_get_width(scr) / (double)gdk_screen_get_width_mm(scr)); - canvas->yres = ((double)gdk_screen_get_height(scr) / (double)gdk_screen_get_height(scr)); + canvas->yres = ((double)gdk_screen_get_height(scr) / (double)gdk_screen_get_height_mm(scr)); canvas->w_mm = ((double)canvas->w) / canvas->xres; canvas->h_mm = ((double)canvas->h) / canvas->yres; canvas->invert_yaxis = 1; @@ -2559,13 +2500,15 @@ cdCtxCanvas *cdgdkCreateCanvas(cdCanvas* canvas, GdkDrawable* wnd, GdkScreen* sc cdRegisterAttribute(canvas, &gc_attrib); cdRegisterAttribute(canvas, &rotate_attrib); + cdRegisterAttribute(canvas, &aa_attrib); + cdRegisterAttribute(canvas, &version_attrib); first = 0; return ctxcanvas; } -void cdxInitTable(cdCanvas* canvas) +void cdgdkInitTable(cdCanvas* canvas) { canvas->cxFlush = cdflush; canvas->cxClear = cdclear; @@ -2574,7 +2517,6 @@ void cdxInitTable(cdCanvas* canvas) canvas->cxLine = cdline; canvas->cxPoly = cdgdkPoly; canvas->cxRect = cdrect; -// canvas->cxRect = cdrectCairo; canvas->cxBox = cdbox; canvas->cxArc = cdarc; canvas->cxSector = cdsector; @@ -2620,12 +2562,3 @@ void cdxInitTable(cdCanvas* canvas) if (canvas->bpp > 8) canvas->cxPutImageRectRGBA = cdputimagerectrgba; } - -/* -- ver como ficará o desenho do chord (já que não tem no GDK e Cairo) -- no final, ir convertendo o que der para Cairo -- conferir funcionamento do gdk_gc_new -- text e font = ver o comportamento -- ver como funfa gdk_drawable_get_image // XPixmap, YPixmap, ZPixmap -- conferir funções que usam gdk_image_new -*/
\ No newline at end of file diff --git a/src/gdk/cdgdk.h b/src/gdk/cdgdk.h index aea5e8a..82cb25d 100644 --- a/src/gdk/cdgdk.h +++ b/src/gdk/cdgdk.h @@ -22,15 +22,17 @@ struct _cdCtxImage { struct _cdCtxCanvas { cdCanvas* canvas; - GdkVisual* vis; /* visual usado pela aplicacao */ + GdkVisual* vis; /* visual of the application */ GdkScreen *scr; GdkGC* gc; /* graphic context */ GdkDrawable* wnd; /* drawable */ - GdkColor fg; + GdkColor fg, bg; - GdkPixmap* last_hatch; /* ultimo hatch setado pelo usuario */ - GdkPixmap* last_stipple; /* ultimo stipple setado pelo usuario */ - GdkPixmap* last_pattern; /* ultimo pattern setado pelo usuario */ + GdkGCValues gcval; + + GdkPixmap* last_hatch; /* last hatch set by user */ + GdkPixmap* last_stipple; /* last stipple set by user */ + GdkPixmap* last_pattern; /* last pattern set by user */ GdkGC* last_stipple_gc; int last_stipple_w; int last_stipple_h; @@ -39,28 +41,28 @@ struct _cdCtxCanvas { int last_pattern_w; int last_pattern_h; - unsigned int depth; /* depth do canvas */ - GdkPixmap* clip_polygon; /* poligono de clipping */ + unsigned int depth; /* canvas depth */ + GdkPixmap* clip_polygon; /* clipping polygon */ GdkPixmap* new_region; GdkPixmap* region_aux; GdkGC* region_aux_gc; - void *data; /* informacoes especificas do driver */ - long int *xidata; /* ximage cache */ + void *data; /* specific information about the driver */ + long int *xidata; /* Image cache */ int xisize; - GdkColormap* colormap; /* colormap para todos os canvas */ - GdkColor* color_table; /* tabela de cores do colormap */ - int num_colors; /* tamanho maximo da tabela de cores */ - int rshift; /* constante red para calculo truecolor */ - int gshift; /* constante green para calculo truecolor */ - int bshift; /* constante blue para calculo truecolor */ - double xmatrix[6]; /* transformation matrix that includes axis inversion */ + GdkColormap* colormap; /* Color map default */ + GdkColor* color_table; /* Color table of the color map */ + int num_colors; /* Size of the color table */ + int rshift; /* Red constant to calculate the true color */ + int gshift; /* Green constant to calculate the true color */ + int bshift; /* Blue constant to calculate the true color */ + double xmatrix[6]; /* Transformation matrix that includes axis inversion */ float rotate_angle; int rotate_center_x, rotate_center_y; - cairo_font_face_t* font; /* fonte de caracteres no X */ + cairo_scaled_font_t* font; /* Scaled font (character font + size font */ - cdImage* image_dbuffer; /* utilizado pelo driver de Double buffer */ + cdImage* image_dbuffer; /* Used by double buffer driver */ cdCanvas* canvas_dbuffer; }; @@ -74,8 +76,8 @@ extern void (*cdxGetRGB)(cdCtxCanvas *ctxcanvas, unsigned long pixel, unsigned char* blue); cdCtxCanvas *cdgdkCreateCanvas(cdCanvas* canvas, GdkDrawable* wnd, GdkScreen* scr, GdkVisual* vis); -void cdxInitTable(cdCanvas* canvas); -void cdxKillCanvas(cdCtxCanvas *ctxcanvas); +void cdgdkInitTable(cdCanvas* canvas); +void cdgdkKillCanvas(cdCtxCanvas *ctxcanvas); int cdgdkClip(cdCtxCanvas *ctxcanvas, int clip_mode); void cdgdkPoly(cdCtxCanvas *ctxcanvas, int mode, cdPoint* poly, int n); diff --git a/src/gdk/cdgdkdbuf.c b/src/gdk/cdgdkdbuf.c index 03b49b4..545a9b1 100644 --- a/src/gdk/cdgdkdbuf.c +++ b/src/gdk/cdgdkdbuf.c @@ -13,7 +13,7 @@ static void cdkillcanvas (cdCtxCanvas* ctxcanvas) { cdKillImage(ctxcanvas->image_dbuffer); - cdxKillCanvas(ctxcanvas); + cdgdkKillCanvas(ctxcanvas); } static void cddeactivate(cdCtxCanvas* ctxcanvas) @@ -104,7 +104,7 @@ static int cdactivate(cdCtxCanvas* ctxcanvas) /* remove the old image and canvas */ cdKillImage(old_image_dbuffer); - cdxKillCanvas(old_ctxcanvas); + cdgdkKillCanvas(old_ctxcanvas); ctxcanvas = canvas->ctxcanvas; @@ -137,7 +137,7 @@ static int cdactivate(cdCtxCanvas* ctxcanvas) static void cdinittable(cdCanvas* canvas) { - cdxInitTable(canvas); + cdgdkInitTable(canvas); canvas->cxActivate = cdactivate; canvas->cxDeactivate = cddeactivate; diff --git a/src/gdk/cdgdkimg.c b/src/gdk/cdgdkimg.c index 674792e..729d96c 100644 --- a/src/gdk/cdgdkimg.c +++ b/src/gdk/cdgdkimg.c @@ -12,7 +12,7 @@ static void cdkillcanvas(cdCtxCanvas* ctxcanvas) { - cdxKillCanvas(ctxcanvas); + cdgdkKillCanvas(ctxcanvas); } static void cdcreatecanvas(cdCanvas* canvas, void *data) @@ -23,7 +23,7 @@ static void cdcreatecanvas(cdCanvas* canvas, void *data) static void cdinittable(cdCanvas* canvas) { - cdxInitTable(canvas); + cdgdkInitTable(canvas); canvas->cxKillCanvas = cdkillcanvas; } diff --git a/src/gdk/cdgdknative.c b/src/gdk/cdgdknative.c index 94577fa..6e8cbe5 100644 --- a/src/gdk/cdgdknative.c +++ b/src/gdk/cdgdknative.c @@ -58,8 +58,7 @@ void cdGetScreenSize(int *width, int *height, double *width_mm, double *height_m static void cdkillcanvas(cdCtxCanvas *ctxcanvas) { - cdxKillCanvas(ctxcanvas); - printf("cdkillcanvas\n"); + cdgdkKillCanvas(ctxcanvas); } static int cdactivate(cdCtxCanvas *ctxcanvas) @@ -72,7 +71,6 @@ static int cdactivate(cdCtxCanvas *ctxcanvas) if (ctxcanvas->canvas->use_matrix) ctxcanvas->canvas->cxTransform(ctxcanvas, ctxcanvas->canvas->matrix); - printf("cdactivate\n"); return CD_OK; } @@ -87,7 +85,7 @@ static void cdcreatecanvas(cdCanvas* canvas, void *data) static void cdinittable(cdCanvas* canvas) { - cdxInitTable(canvas); + cdgdkInitTable(canvas); canvas->cxKillCanvas = cdkillcanvas; canvas->cxActivate = cdactivate; diff --git a/src/svg/base64.c b/src/svg/base64.c new file mode 100644 index 0000000..c01b130 --- /dev/null +++ b/src/svg/base64.c @@ -0,0 +1,231 @@ +/*********************************************************************** +=============== +BASE64 Encoding +=============== +Available on: http://freecode-freecode.blogspot.com/2008/02/base64c.html +Last access in: November, 10th 2009. +************************************************************************/ + +#include "stdio.h" +#include "stdlib.h" +#include "string.h" +#include "base64.h" + +/** + * characters used for Base64 encoding + */ +const char *BASE64_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + +/** + * encode three bytes using base64 (RFC 3548) + * + * @param triple three bytes that should be encoded + * @param result buffer of four characters where the result is stored + */ +void _base64_encode_triple(unsigned char triple[3], char result[4]) +{ + int tripleValue, i; + + tripleValue = triple[0]; + tripleValue *= 256; + tripleValue += triple[1]; + tripleValue *= 256; + tripleValue += triple[2]; + + for (i=0; i<4; i++) + { + result[3-i] = BASE64_CHARS[tripleValue%64]; + tripleValue /= 64; + } +} + +/** + * encode an array of bytes using Base64 (RFC 3548) + * + * @param source the source buffer + * @param sourcelen the length of the source buffer + * @param target the target buffer + * @param targetlen the length of the target buffer + * @return 1 on success, 0 otherwise + */ +int base64_encode(unsigned char *source, int sourcelen, char *target, int targetlen) +{ + /* check if the result will fit in the target buffer */ + if ((sourcelen+2)/3*4 > targetlen-1) + return 0; + + /* encode all full triples */ + while (sourcelen >= 3) + { + _base64_encode_triple(source, target); + sourcelen -= 3; + source += 3; + target += 4; + } + + /* encode the last one or two characters */ + if (sourcelen > 0) + { + unsigned char temp[3]; + memset(temp, 0, sizeof(temp)); + memcpy(temp, source, sourcelen); + _base64_encode_triple(temp, target); + target[3] = '='; + + if (sourcelen == 1) + target[2] = '='; + + target += 4; + } + + /* terminate the string */ + target[0] = 0; + + return 1; +} + +/** + * determine the value of a base64 encoding character + * + * @param base64char the character of which the value is searched + * @return the value in case of success (0-63), -1 on failure + */ +int _base64_char_value(char base64char) +{ + if (base64char >= 'A' && base64char <= 'Z') + return base64char-'A'; + + if (base64char >= 'a' && base64char <= 'z') + return base64char-'a'+26; + + if (base64char >= '0' && base64char <= '9') + return base64char-'0'+2*26; + + if (base64char == '+') + return 2*26+10; + + if (base64char == '/') + return 2*26+11; + + return -1; +} + +/** + * decode a 4 char base64 encoded byte triple + * + * @param quadruple the 4 characters that should be decoded + * @param result the decoded data + * @return lenth of the result (1, 2 or 3), 0 on failure + */ +int _base64_decode_triple(char quadruple[4], unsigned char *result) +{ + int i, triple_value, bytes_to_decode = 3, only_equals_yet = 1; + int char_value[4]; + + for (i=0; i<4; i++) + char_value[i] = _base64_char_value(quadruple[i]); + + /* check if the characters are valid */ + for (i=3; i>=0; i--) + { + if (char_value[i]<0) + { + if (only_equals_yet && quadruple[i]=='=') + { + /* we will ignore this character anyway, make it something + * that does not break our calculations */ + + char_value[i]=0; + bytes_to_decode--; + continue; + } + return 0; + } + + /* after we got a real character, no other '=' are allowed anymore */ + only_equals_yet = 0; + } + + /* if we got "====" as input, bytes_to_decode is -1 */ + if (bytes_to_decode < 0) + bytes_to_decode = 0; + + /* make one big value out of the partial values */ + triple_value = char_value[0]; + triple_value *= 64; + triple_value += char_value[1]; + triple_value *= 64; + triple_value += char_value[2]; + triple_value *= 64; + triple_value += char_value[3]; + + /* break the big value into bytes */ + for (i=bytes_to_decode; i<3; i++) + triple_value /= 256; + + for (i=bytes_to_decode-1; i>=0; i--) + { + result[i] = triple_value%256; + triple_value /= 256; + } + + return bytes_to_decode; +} + +/** + * decode base64 encoded data + * + * @param source the encoded data (zero terminated) + * @param target pointer to the target buffer + * @param targetlen length of the target buffer + * @return length of converted data on success, -1 otherwise + */ +int base64_decode(char *source, unsigned char *target, int targetlen) +{ + char *src, *tmpptr; + char quadruple[4], tmpresult[3]; + int i, tmplen = 3; + int converted = 0; + + /* concatenate '===' to the source to handle unpadded base64 data */ + src = (char *)malloc(strlen(source)+5); + if (src == NULL) + return -1; + + strcpy(src, source); + strcat(src, "===="); + tmpptr = src; + + /* convert as long as we get a full result */ + while (tmplen == 3) + { + /* get 4 characters to convert */ + for (i=0; i<4; i++) + { + /* skip invalid characters - we won't reach the end */ + while (*tmpptr != '=' && _base64_char_value(*tmpptr)<0) + tmpptr++; + + quadruple[i] = *(tmpptr++); + } + + /* convert the characters */ + tmplen = _base64_decode_triple(quadruple, (unsigned char*)tmpresult); + + /* check if the fit in the result buffer */ + if (targetlen < tmplen) + { + free(src); + return -1; + } + + /* put the partial result in the result buffer */ + memcpy(target, tmpresult, tmplen); + target += tmplen; + targetlen -= tmplen; + converted += tmplen; + } + + free(src); + return converted; +} diff --git a/src/svg/base64.h b/src/svg/base64.h new file mode 100644 index 0000000..87293e9 --- /dev/null +++ b/src/svg/base64.h @@ -0,0 +1,20 @@ +/** \file + * \brief BASE64 encoding + * + */ + +#ifndef __BASE64_H +#define __BASE64_H + +#ifdef __cplusplus +extern "C" { +#endif + +int base64_encode(unsigned char *source, int sourcelen, char *target, int targetlen); +int base64_decode(char *source, unsigned char *target, int targetlen); + +#ifdef __cplusplus +} +#endif + +#endif /* ifndef __BASE64_ */ diff --git a/src/svg/cdsvg.c b/src/svg/cdsvg.c new file mode 100644 index 0000000..693791b --- /dev/null +++ b/src/svg/cdsvg.c @@ -0,0 +1,1003 @@ +/** \file + * \brief SVG driver + * + * See Copyright Notice in cd.h + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <limits.h> +#include <math.h> +#include <locale.h> + +#include "cd.h" +#include "wd.h" +#include "cd_private.h" +#include "cdsvg.h" + +#include "lodepng.h" +#include "base64.h" + +typedef struct _cdCtxCanvas +{ + cdCanvas* canvas; + char* filename; + + char bgColor[20]; + char fgColor[20]; + char linecap[10]; + char linejoin[10]; + char linestyle[20]; + char poly[256]; + char pattern[30]; + + char font_weight[15]; + char font_style[15]; + char font_decoration[15]; + char font_family[256]; + char font_size[10]; + + int backopacity; + int writemode; + int linewidth; + int hatchboxsize; + + double xmatrix[6]; /* Transformation matrix that includes axis inversion */ + + /* private */ + int last_fill_mode; + + int last_clip_path; + int clip_off_control; + int clip_polygon; + + int transform_control; + + FILE* file; +} cdCtxCanvas; + +static void cdkillcanvas(cdCtxCanvas* ctxcanvas) +{ + while(ctxcanvas->clip_off_control > 0) + { + fprintf(ctxcanvas->file, "</g>\n"); + --ctxcanvas->clip_off_control; + } + + if(ctxcanvas->transform_control) + fprintf(ctxcanvas->file, "</g>\n"); + + fprintf(ctxcanvas->file, "</g>\n"); + fprintf(ctxcanvas->file, "</svg>\n"); + + free(ctxcanvas->filename); + fclose(ctxcanvas->file); + + memset(ctxcanvas, 0, sizeof(cdCtxCanvas)); + free(ctxcanvas); +} + +static void setclip_area(cdCtxCanvas *ctxcanvas) +{ + cdRect* clip_rect = &ctxcanvas->canvas->clip_rect; + + fprintf(ctxcanvas->file, "<clipPath id=\"clippath%d\">\n", ++ctxcanvas->last_clip_path); + + if (ctxcanvas->canvas->use_matrix) + { + cdPoint poly[4]; + poly[0].x = clip_rect->xmin; poly[0].y = clip_rect->ymin; + poly[1].x = clip_rect->xmin; poly[1].y = clip_rect->ymax; + poly[2].x = clip_rect->xmax; poly[2].y = clip_rect->ymax; + poly[3].x = clip_rect->xmax; poly[3].y = clip_rect->ymin; + + sprintf(ctxcanvas->poly, "%g,%g", (double)poly[0].x, (double)poly[0].y); + sprintf(ctxcanvas->poly, "%s %g,%g", ctxcanvas->poly, (double)poly[1].x, (double)poly[1].y); + sprintf(ctxcanvas->poly, "%s %g,%g", ctxcanvas->poly, (double)poly[2].x, (double)poly[2].y); + sprintf(ctxcanvas->poly, "%s %g,%g", ctxcanvas->poly, (double)poly[3].x, (double)poly[3].y); + + fprintf(ctxcanvas->file, "<polygon points=\"%s\" />\n", ctxcanvas->poly); + } + else + { + double x, y, w, h; + x = (double)clip_rect->xmin; + y = (double)clip_rect->ymin; + w = (double)(clip_rect->xmax - clip_rect->xmin + 1); + h = (double)(clip_rect->ymax - clip_rect->ymin + 1); + + fprintf(ctxcanvas->file, "<rect x=\"%g\" y=\"%g\" width=\"%g\" height=\"%g\" />\n", x, y, w, h); + } + + fprintf(ctxcanvas->file, "</clipPath>\n"); + + fprintf(ctxcanvas->file, "<g clip-path=\"url(#clippath%d)\">\n", ctxcanvas->last_clip_path); + ++ctxcanvas->clip_off_control; +} + +int cdclip(cdCtxCanvas *ctxcanvas, int clip_mode) +{ + switch (clip_mode) + { + case CD_CLIPOFF: + if(ctxcanvas->clip_off_control > 0) + { + fprintf(ctxcanvas->file, "</g>\n"); + --ctxcanvas->clip_off_control; + } + break; + case CD_CLIPAREA: + setclip_area(ctxcanvas); + break; + case CD_CLIPPOLYGON: + if (ctxcanvas->clip_polygon) + { + fprintf(ctxcanvas->file, "<g clip-path=\"url(#clippath%d)\">\n", ctxcanvas->last_clip_path); + ++ctxcanvas->clip_off_control; + } + break; + } + return clip_mode; +} + +static void cdfcliparea(cdCtxCanvas *ctxcanvas, double xmin, double xmax, double ymin, double ymax) +{ + if (ctxcanvas->canvas->clip_mode == CD_CLIPAREA) + { + ctxcanvas->canvas->clip_rect.xmin = (int)xmin; + ctxcanvas->canvas->clip_rect.ymin = (int)ymin; + ctxcanvas->canvas->clip_rect.xmax = (int)xmax; + ctxcanvas->canvas->clip_rect.ymax = (int)ymax; + cdclip(ctxcanvas, CD_CLIPAREA); + } +} + +static void cdcliparea(cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax) +{ + cdfcliparea(ctxcanvas, (double)xmin, (double)xmax, (double)ymin, (double)ymax); +} + +static void cdtransform(cdCtxCanvas *ctxcanvas, const double* matrix) +{ + if (matrix) + { + /* Matrix identity */ + ctxcanvas->xmatrix[0] = 1; + ctxcanvas->xmatrix[1] = 0; + ctxcanvas->xmatrix[2] = 0; + ctxcanvas->xmatrix[3] = -1; + ctxcanvas->xmatrix[4] = 0; + ctxcanvas->xmatrix[5] = (ctxcanvas->canvas->h-1); + + if(ctxcanvas->transform_control) + { + fprintf(ctxcanvas->file, "</g>\n"); + --ctxcanvas->transform_control; + } + + cdMatrixMultiply(matrix, ctxcanvas->xmatrix); + + ++ctxcanvas->transform_control; + fprintf(ctxcanvas->file, "<g transform=\"matrix(%g %g %g %g %g %g)\">\n", ctxcanvas->xmatrix[0], ctxcanvas->xmatrix[1], ctxcanvas->xmatrix[2], ctxcanvas->xmatrix[3], ctxcanvas->xmatrix[4], ctxcanvas->xmatrix[5]); + + ctxcanvas->canvas->invert_yaxis = 0; + } + else + { + ctxcanvas->canvas->invert_yaxis = 1; + } +} + +static void cdfline(cdCtxCanvas *ctxcanvas, double x1, double y1, double x2, double y2) +{ + fprintf(ctxcanvas->file, "<line x1=\"%g\" y1=\"%g\" x2=\"%g\" y2=\"%g\" style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; stroke-dasharray:%s; opacity:%d\" />\n", + x1, y1, x2, y2, ctxcanvas->fgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->linestyle, ctxcanvas->backopacity); +} + +static void cdline(cdCtxCanvas *ctxcanvas, int x1, int y1, int x2, int y2) +{ + cdfline(ctxcanvas, (double)x1, (double)y1, (double)x2, (double)y2); +} + +static void cdfrect(cdCtxCanvas *ctxcanvas, double xmin, double xmax, double ymin, double ymax) +{ + fprintf(ctxcanvas->file, "<rect x=\"%g\" y=\"%g\" width=\"%g\" height=\"%g\" style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; stroke-dasharray:%s; opacity:%d\" />\n", + xmin, ymin, xmax-xmin, ymax-ymin, ctxcanvas->fgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->linestyle, ctxcanvas->backopacity); +} + +static void cdrect(cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax) +{ + cdfrect(ctxcanvas, (double)xmin, (double)xmax, (double)ymin, (double)ymax); +} + +static void cdfbox(cdCtxCanvas *ctxcanvas, double xmin, double xmax, double ymin, double ymax) +{ + fprintf(ctxcanvas->file, "<rect x=\"%g\" y=\"%g\" width=\"%g\" height=\"%g\" style=\"fill:%s; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; stroke-dasharray:%s; opacity:%d\" />\n", + xmin, ymin, xmax-xmin, ymax-ymin, (ctxcanvas->canvas->interior_style == CD_SOLID) ? ctxcanvas->fgColor : ctxcanvas->pattern, + (ctxcanvas->canvas->interior_style == CD_SOLID) ? ctxcanvas->fgColor : "none", ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->linestyle, ctxcanvas->backopacity); +} + +static void cdbox(cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax) +{ + cdfbox(ctxcanvas, (double)xmin, (double)xmax, (double)ymin, (double)ymax); +} + +static void cdfarc(cdCtxCanvas *ctxcanvas, double xc, double yc, double w, double h, double a1, double a2) +{ + double arcStartX, arcStartY, arcEndX, arcEndY; + int largeArc = 0; + + if((a1 == 0.0) && (a2 == 360.0)) /* an ellipse/circle */ + { + fprintf(ctxcanvas->file, "<ellipse cx=\"%g\" cy=\"%g\" rx=\"%g\" ry=\"%g\" style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; stroke-dasharray:%s; opacity:%d\" />\n", + xc, yc, w/2, h/2, ctxcanvas->fgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->linestyle, ctxcanvas->backopacity); + + return; + } + + if (ctxcanvas->canvas->use_matrix) /* Transformation active */ + { + double temp = 360 - a1; + a1 = 360 - a2; + a2 = temp; + } + + arcStartX = (xc+(w/2)*cos(a1*CD_DEG2RAD)); + arcStartY = (yc-(h/2)*sin(a1*CD_DEG2RAD)); + arcEndX = (xc+(w/2)*cos(a2*CD_DEG2RAD)); + arcEndY = (yc-(h/2)*sin(a2*CD_DEG2RAD)); + + if((a2-a1) > 180.0) + largeArc = 1; + + fprintf(ctxcanvas->file, "<path d=\"M%g,%g A%g,%g 0 %d,0 %g,%g\" style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; stroke-dasharray:%s; opacity:%d\" />\n", + arcStartX, arcStartY, w/2, h/2, largeArc, arcEndX, arcEndY, ctxcanvas->fgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->linestyle, ctxcanvas->backopacity); +} + +static void cdarc(cdCtxCanvas *ctxcanvas, int xc, int yc, int w, int h, double a1, double a2) +{ + cdfarc(ctxcanvas, (double)xc, (double)yc, (double)w, (double)h, a1, a2); +} + +static void cdfsector(cdCtxCanvas *ctxcanvas, double xc, double yc, double w, double h, double a1, double a2) +{ + double arcStartX, arcStartY, arcEndX, arcEndY; + int largeArc = 0; + + if((a1 == 0.0) && (a2 == 360.0)) /* an ellipse/circle */ + { + fprintf(ctxcanvas->file, "<ellipse cx=\"%g\" cy=\"%g\" rx=\"%g\" ry=\"%g\" style=\"fill:%s; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; stroke-dasharray:%s; opacity:%d\" />\n", + xc, yc, w/2, h/2, (ctxcanvas->canvas->interior_style == CD_SOLID) ? ctxcanvas->fgColor : ctxcanvas->pattern, + (ctxcanvas->canvas->interior_style == CD_SOLID) ? ctxcanvas->fgColor : "none", ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->linestyle, ctxcanvas->backopacity); + + return; + } + + if (ctxcanvas->canvas->use_matrix) /* Transformation active */ + { + double temp = 360 - a1; + a1 = 360 - a2; + a2 = temp; + } + + arcStartX = (xc+(w/2)*cos(a1*CD_DEG2RAD)); + arcStartY = (yc-(h/2)*sin(a1*CD_DEG2RAD)); + arcEndX = (xc+(w/2)*cos(a2*CD_DEG2RAD)); + arcEndY = (yc-(h/2)*sin(a2*CD_DEG2RAD)); + + if((a2-a1) > 180.0) + largeArc = 1; + + fprintf(ctxcanvas->file, "<path d=\"M%g,%g L%g,%g A%g,%g 0 %d,0 %g,%g Z\" style=\"fill:%s; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; stroke-dasharray:%s; opacity:%d\" />\n", + xc, yc, arcStartX, arcStartY, w/2, h/2, largeArc, arcEndX, arcEndY, (ctxcanvas->canvas->interior_style == CD_SOLID) ? ctxcanvas->fgColor : ctxcanvas->pattern, + (ctxcanvas->canvas->interior_style == CD_SOLID) ? ctxcanvas->fgColor : "none", ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->linestyle, ctxcanvas->backopacity); +} + +static void cdsector(cdCtxCanvas *ctxcanvas, int xc, int yc, int w, int h, double a1, double a2) +{ + cdfsector(ctxcanvas, (double)xc, (double)yc, (double)w, (double)h, a1, a2); +} + +static void cdfchord(cdCtxCanvas *ctxcanvas, double xc, double yc, double w, double h, double a1, double a2) +{ + double arcStartX, arcStartY, arcEndX, arcEndY; + int largeArc = 0; + + if (ctxcanvas->canvas->use_matrix) /* Transformation active */ + { + double temp = 360 - a1; + a1 = 360 - a2; + a2 = temp; + } + + arcStartX = (xc+(w/2)*cos(a1*CD_DEG2RAD)); + arcStartY = (yc-(h/2)*sin(a1*CD_DEG2RAD)); + arcEndX = (xc+(w/2)*cos(a2*CD_DEG2RAD)); + arcEndY = (yc-(h/2)*sin(a2*CD_DEG2RAD)); + + if((a2-a1) > 180.0) + largeArc = 1; + + fprintf(ctxcanvas->file, "<path d=\"M%g,%g A%g,%g 0 %d,0 %g,%g Z\" style=\"fill:%s; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; stroke-dasharray:%s; opacity:%d\" />\n", + arcStartX, arcStartY, w/2, h/2, largeArc, arcEndX, arcEndY, (ctxcanvas->canvas->interior_style == CD_SOLID) ? ctxcanvas->fgColor : ctxcanvas->pattern, + (ctxcanvas->canvas->interior_style == CD_SOLID) ? ctxcanvas->fgColor : "none", ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->linestyle, ctxcanvas->backopacity); +} + +static void cdchord(cdCtxCanvas *ctxcanvas, int xc, int yc, int w, int h, double a1, double a2) +{ + cdfchord(ctxcanvas, (double)xc, (double)yc, (double)w, (double)h, a1, a2); +} + +static void cdftext(cdCtxCanvas *ctxcanvas, double x, double y, const char *text, int len) +{ + char anchor[10]; + char alignment[20]; + int i; + + switch (ctxcanvas->canvas->text_alignment) + { + case CD_NORTH: + case CD_NORTH_EAST: + case CD_NORTH_WEST: + sprintf(alignment, "%s", "text-before-edge"); + break; + case CD_SOUTH: + case CD_SOUTH_EAST: + case CD_SOUTH_WEST: + sprintf(alignment, "%s", "text-after-edge"); + break; + case CD_CENTER: + case CD_EAST: + case CD_WEST: + sprintf(alignment, "%s", "middle"); + break; + case CD_BASE_CENTER: + case CD_BASE_LEFT: + case CD_BASE_RIGHT: + sprintf(alignment, "%s", "baseline"); + break; + } + + switch (ctxcanvas->canvas->text_alignment) + { + case CD_WEST: + case CD_NORTH_WEST: + case CD_SOUTH_WEST: + case CD_BASE_LEFT: + sprintf(anchor, "%s", "start"); + break; + case CD_CENTER: + case CD_NORTH: + case CD_SOUTH: + case CD_BASE_CENTER: + sprintf(anchor, "%s", "middle"); + break; + case CD_EAST: + case CD_NORTH_EAST: + case CD_SOUTH_EAST: + case CD_BASE_RIGHT: + sprintf(anchor, "%s", "end"); + break; + } + + /* Characters are putting in file using hexadecimal representations */ + /* <text> string </text> no print special characters, like cedilla and acutes */ + /* Future solution: use glyphs in embedded fonts (TO DO)*/ + + if (ctxcanvas->canvas->text_orientation != 0) + { + double text_cos = cos(ctxcanvas->canvas->text_orientation*CD_DEG2RAD); + double text_sin = sin(ctxcanvas->canvas->text_orientation*CD_DEG2RAD); + + if (ctxcanvas->canvas->use_matrix) /* Transformation active */ + fprintf(ctxcanvas->file, "<text transform=\"matrix(%g %g %g %g %g %g)\" font-family=\"%s\" font-size=\"%s\" font-style=\"%s\" font-weight=\"%s\" text-decoration=\"%s\" text-anchor=\"%s\" dominant-baseline=\"%s\" fill=\"%s\">\n", + text_cos, text_sin, text_sin, -text_cos, x, y, ctxcanvas->font_family, ctxcanvas->font_size, ctxcanvas->font_style, ctxcanvas->font_weight, ctxcanvas->font_decoration, anchor, alignment, ctxcanvas->fgColor); + else + fprintf(ctxcanvas->file, "<text transform=\"matrix(%g %g %g %g %g %g)\" font-family=\"%s\" font-size=\"%s\" font-style=\"%s\" font-weight=\"%s\" text-decoration=\"%s\" text-anchor=\"%s\" dominant-baseline=\"%s\" fill=\"%s\">\n", + text_cos, -text_sin, text_sin, text_cos, x, y, ctxcanvas->font_family, ctxcanvas->font_size, ctxcanvas->font_style, ctxcanvas->font_weight, ctxcanvas->font_decoration, anchor, alignment, ctxcanvas->fgColor); + + for(i = 0; i < len; i++) + fprintf(ctxcanvas->file, "&#x%02X;", (unsigned char)text[i]); + + fprintf(ctxcanvas->file, "\n</text>\n"); + } + else + { + fprintf(ctxcanvas->file, "<text x=\"%g\" y=\"%g\" font-family=\"%s\" font-size=\"%s\" font-style=\"%s\" font-weight=\"%s\" text-decoration=\"%s\" text-anchor=\"%s\" dominant-baseline=\"%s\" fill=\"%s\">\n", + x, y, ctxcanvas->font_family, ctxcanvas->font_size, ctxcanvas->font_style, ctxcanvas->font_weight, ctxcanvas->font_decoration, anchor, alignment, ctxcanvas->fgColor); + + for(i = 0; i < len; i++) + fprintf(ctxcanvas->file, "&#x%02X;", (unsigned char)text[i]); + + fprintf(ctxcanvas->file, "\n</text>\n"); + } +} + +static void cdtext(cdCtxCanvas *ctxcanvas, int x, int y, const char *text, int len) +{ + cdftext(ctxcanvas, (double)x, (double)y, text, len); +} + +static void cdfpoly(cdCtxCanvas *ctxcanvas, int mode, cdfPoint* poly, int n) +{ + int i, m = 0; + char rule[8]; + + if(mode == CD_BEZIER) + m = 1; + + sprintf(ctxcanvas->poly, "%g,%g", poly[m].x, poly[m].y); + for(i = m+1; i<n; i++) + sprintf(ctxcanvas->poly, "%s %g,%g", ctxcanvas->poly, poly[i].x, poly[i].y); + + switch (mode) + { + case CD_CLOSED_LINES : + fprintf(ctxcanvas->file, "<polygon style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; stroke-dasharray:%s; opacity:%d\" points=\"%s\" />\n", + ctxcanvas->fgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->linestyle, ctxcanvas->backopacity, ctxcanvas->poly); + break; + case CD_OPEN_LINES : + fprintf(ctxcanvas->file, "<polyline style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; stroke-dasharray:%s; opacity:%d\" points=\"%s\" />\n", + ctxcanvas->fgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->linestyle, ctxcanvas->backopacity, ctxcanvas->poly); + break; + case CD_BEZIER : + fprintf(ctxcanvas->file, "<path d=\"M%g,%g C%s\" style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; stroke-dasharray:%s; opacity:%d\" />\n", + poly[0].x, poly[0].y, ctxcanvas->poly, ctxcanvas->fgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->linestyle, ctxcanvas->backopacity); + break; + case CD_FILL : + if(ctxcanvas->canvas->fill_mode==CD_EVENODD) + sprintf(rule, "%s", "evenodd"); + else + sprintf(rule, "%s", "nonzero"); + + fprintf(ctxcanvas->file, "<polygon style=\"fill:%s; fill-rule:%s; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; stroke-dasharray:%s; opacity:%d\" points=\"%s\" />\n", + (ctxcanvas->canvas->interior_style == CD_SOLID) ? ctxcanvas->fgColor : ctxcanvas->pattern, rule, (ctxcanvas->canvas->interior_style == CD_SOLID) ? ctxcanvas->fgColor : "none", + ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->linestyle, ctxcanvas->backopacity, ctxcanvas->poly); + break; + case CD_CLIP: + fprintf(ctxcanvas->file, "<clipPath id=\"clippath%d\">\n", ++ctxcanvas->last_clip_path); + + fprintf(ctxcanvas->file, "<polygon points=\"%s\" />\n", ctxcanvas->poly); + + fprintf(ctxcanvas->file, "</clipPath>\n"); + + ctxcanvas->clip_polygon = 1; + + if (ctxcanvas->canvas->clip_mode == CD_CLIPPOLYGON) + cdclip(ctxcanvas, CD_CLIPPOLYGON); + + break; + + } +} + +static void cdpoly(cdCtxCanvas *ctxcanvas, int mode, cdPoint* poly, int n) +{ + int i; + cdfPoint* newPoly = NULL; + + newPoly = (cdfPoint*)malloc(sizeof(cdfPoint)*(n+1)); + + for(i = 0; i < n; i++) + { + newPoly[i].x = (double)poly[i].x; + newPoly[i].y = (double)poly[i].y; + } + + cdfpoly(ctxcanvas, mode, (cdfPoint*)newPoly, n); + + free(newPoly); +} + +static int cdbackopacity(cdCtxCanvas *ctxcanvas, int opacity) +{ + ctxcanvas->backopacity = opacity; + return opacity; +} + +static int cdlinestyle(cdCtxCanvas *ctxcanvas, int style) +{ + switch (style) + { + case CD_CONTINUOUS : /* empty dash */ + sprintf(ctxcanvas->linestyle, "%s", "0"); + break; + case CD_DASHED : + sprintf(ctxcanvas->linestyle, "%s", "6,2"); + break; + case CD_DOTTED : + sprintf(ctxcanvas->linestyle, "%s", "2,2"); + break; + case CD_DASH_DOT : + sprintf(ctxcanvas->linestyle, "%s", "6,2,2,2"); + break; + case CD_DASH_DOT_DOT : + sprintf(ctxcanvas->linestyle, "%s", "6,2,2,2,2,2"); + break; + case CD_CUSTOM : + { + int i; + sprintf(ctxcanvas->linestyle, "%d", ctxcanvas->canvas->line_dashes[0]); + + for (i = 1; i < ctxcanvas->canvas->line_dashes_count; i++) + sprintf(ctxcanvas->linestyle, "%s, %d", ctxcanvas->linestyle, ctxcanvas->canvas->line_dashes[i]); + } + break; + } + + return style; +} + +static int cdlinewidth(cdCtxCanvas *ctxcanvas, int width) +{ + ctxcanvas->linewidth = width; + + return width; +} + +static int cdlinecap(cdCtxCanvas *ctxcanvas, int cap) +{ + if(cap == CD_CAPROUND) + sprintf(ctxcanvas->linecap, "%s", "round"); + else if(cap == CD_CAPSQUARE) + sprintf(ctxcanvas->linecap, "%s", "square"); + else /* CD_CAPFLAT */ + sprintf(ctxcanvas->linecap, "%s", "butt"); + + return cap; +} + +static int cdlinejoin(cdCtxCanvas *ctxcanvas, int join) +{ + if(join == CD_ROUND) + sprintf(ctxcanvas->linejoin, "%s", "round"); + else if(join == CD_BEVEL) + sprintf(ctxcanvas->linejoin, "%s", "bevel"); + else /* CD_MITER */ + sprintf(ctxcanvas->linejoin, "%s", "miter"); + + return join; +} + +static int cdhatch(cdCtxCanvas *ctxcanvas, int style) +{ + int hsize = ctxcanvas->hatchboxsize - 1; + int hhalf = hsize / 2; + + ctxcanvas->canvas->interior_style = CD_HATCH; + sprintf(ctxcanvas->pattern, "url(#pattern%d)", ++ctxcanvas->last_fill_mode); + fprintf(ctxcanvas->file, "<pattern id=\"pattern%d\" patternUnits=\"userSpaceOnUse\" x=\"0\" y=\"0\" width=\"%d\" height=\"%d\">\n", ctxcanvas->last_fill_mode, hsize, hsize); + + switch(style) + { + case CD_HORIZONTAL: + fprintf(ctxcanvas->file, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; opacity:%d\" />\n", + 0, hhalf, hsize, hhalf, (ctxcanvas->canvas->back_opacity != CD_OPAQUE) ? ctxcanvas->fgColor : ctxcanvas->bgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->backopacity); + break; + case CD_VERTICAL: + fprintf(ctxcanvas->file, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; opacity:%d\" />\n", + hhalf, 0, hhalf, hsize, (ctxcanvas->canvas->back_opacity != CD_OPAQUE) ? ctxcanvas->fgColor : ctxcanvas->bgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->backopacity); + break; + case CD_BDIAGONAL: + fprintf(ctxcanvas->file, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; opacity:%d\" />\n", + 0, hsize, hsize, 0, (ctxcanvas->canvas->back_opacity != CD_OPAQUE) ? ctxcanvas->fgColor : ctxcanvas->bgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->backopacity); + break; + case CD_FDIAGONAL: + fprintf(ctxcanvas->file, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; opacity:%d\" />\n", + 0, 0, hsize, hsize, (ctxcanvas->canvas->back_opacity != CD_OPAQUE) ? ctxcanvas->fgColor : ctxcanvas->bgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->backopacity); + break; + case CD_CROSS: + fprintf(ctxcanvas->file, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; opacity:%d\" />\n", + hsize, 0, hsize, hsize, (ctxcanvas->canvas->back_opacity != CD_OPAQUE) ? ctxcanvas->fgColor : ctxcanvas->bgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->backopacity); + fprintf(ctxcanvas->file, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; opacity:%d\" />\n", + 0, hhalf, hsize, hhalf, (ctxcanvas->canvas->back_opacity != CD_OPAQUE) ? ctxcanvas->fgColor : ctxcanvas->bgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->backopacity); + break; + case CD_DIAGCROSS: + fprintf(ctxcanvas->file, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; opacity:%d\" />\n", + 0, 0, hsize, hsize, (ctxcanvas->canvas->back_opacity != CD_OPAQUE) ? ctxcanvas->fgColor : ctxcanvas->bgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->backopacity); + fprintf(ctxcanvas->file, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" style=\"fill:none; stroke:%s; stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; opacity:%d\" />\n", + hsize, 0, 0, hsize, (ctxcanvas->canvas->back_opacity != CD_OPAQUE) ? ctxcanvas->fgColor : ctxcanvas->bgColor, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->backopacity); + break; + } + + fprintf(ctxcanvas->file, "</pattern>\n"); + + return style; +} + +static void make_pattern(cdCtxCanvas *ctxcanvas, int n, int m, void* data, int (*data2rgb)(cdCtxCanvas *ctxcanvas, int n, int i, int j, void* data, unsigned char*r, unsigned char*g, unsigned char*b)) +{ + int i, j; + unsigned char r, g, b; + char color[20]; + + sprintf(ctxcanvas->pattern, "url(#pattern%d)", ++ctxcanvas->last_fill_mode); + fprintf(ctxcanvas->file, "<pattern id=\"pattern%d\" patternUnits=\"userSpaceOnUse\" x=\"0\" y=\"0\" width=\"%d\" height=\"%d\">\n", ctxcanvas->last_fill_mode, n, m); + + for (j = 0; j < m; j++) + { + for (i = 0; i < n; i++) + { + int ret = data2rgb(ctxcanvas, n, i, j, data, &r, &g, &b); + if (ret == -1) continue; + + sprintf(color, "rgb(%d,%d,%d)", (int)r, (int)g, (int)b); + + fprintf(ctxcanvas->file, "<rect x=\"%g\" y=\"%g\" width=\"%g\" height=\"%g\" style=\"fill:%s; opacity:%d\" />\n", + (double)i, (double)j, 1.0, 1.0, color, ctxcanvas->backopacity); + } + } + + fprintf(ctxcanvas->file, "</pattern>\n"); +} + +static int long2rgb(cdCtxCanvas *ctxcanvas, int n, int i, int j, void* data, unsigned char*r, unsigned char*g, unsigned char*b) +{ + long* long_data = (long*)data; + (void)ctxcanvas; + cdDecodeColor(long_data[j*n+i], r, g, b); + return 1; +} + +static void cdpattern(cdCtxCanvas *ctxcanvas, int n, int m, const long int *pattern) +{ + ctxcanvas->canvas->interior_style = CD_PATTERN; + make_pattern(ctxcanvas, n, m, (void*)pattern, long2rgb); +} + +static int uchar2rgb(cdCtxCanvas *ctxcanvas, int n, int i, int j, void* data, unsigned char*r, unsigned char*g, unsigned char*b) +{ + int ret = 1; + unsigned char* uchar_data = (unsigned char*)data; + if (uchar_data[j*n+i]) + { + cdDecodeColor(ctxcanvas->canvas->foreground, r, g, b); + ret = 1; + } + else + { + cdDecodeColor(ctxcanvas->canvas->background, r, g, b); + if (ctxcanvas->canvas->back_opacity==CD_TRANSPARENT) + ret = -1; + } + + return ret; +} + +static void cdstipple(cdCtxCanvas *ctxcanvas, int n, int m, const unsigned char *stipple) +{ + ctxcanvas->canvas->interior_style = CD_STIPPLE; + make_pattern(ctxcanvas, n, m, (void*)stipple, uchar2rgb); +} + +static int cdfont(cdCtxCanvas *ctxcanvas, const char* type_face, int style, int size) +{ + /* Define type_face and size */ + if(type_face != NULL) + sprintf(ctxcanvas->font_family, "%s", type_face); + + if(size > 0) + sprintf(ctxcanvas->font_size, "%dpt", size); + else + sprintf(ctxcanvas->font_size, "%dpx", (-1)*size); + + if(style != -1) + { + /* Default: CD_PLAIN */ + sprintf(ctxcanvas->font_weight, "%s", "normal"); + sprintf(ctxcanvas->font_style, "%s", "normal"); + sprintf(ctxcanvas->font_decoration, "%s", "none"); + + /* Define styles and decorations */ + if (style & CD_BOLD) + sprintf(ctxcanvas->font_weight, "%s", "bold"); + + if (style & CD_ITALIC) + sprintf(ctxcanvas->font_style, "%s", "italic"); + + if (style & CD_STRIKEOUT) + sprintf(ctxcanvas->font_decoration, "%s", "line-through"); + + if (style & CD_UNDERLINE) + sprintf(ctxcanvas->font_decoration, "%s", "underline"); + } + + return 1; +} + +static long cdbackground(cdCtxCanvas *ctxcanvas, long int color) +{ + unsigned char r, g, b; + cdDecodeColor(color, &r, &g, &b); + sprintf(ctxcanvas->bgColor, "rgb(%d,%d,%d)", (int)r, (int)g, (int)b); + + return color; +} + +static long cdforeground(cdCtxCanvas *ctxcanvas, long int color) +{ + unsigned char r, g, b; + cdDecodeColor(color, &r, &g, &b); + sprintf(ctxcanvas->fgColor, "rgb(%d,%d,%d)", (int)r, (int)g, (int)b); + + return color; +} + +static void cdputimagerectrgb(cdCtxCanvas *ctxcanvas, int iw, int ih, const unsigned char *r, const unsigned char *g, const unsigned char *b, int x, int y, int w, int h, int xmin, int xmax, int ymin, int ymax) +{ + int i, j, d, rw, rh, rgb_size, buffer_size, target_size; + unsigned char* rgb_data, *rgb_buffer; + LodePNG_Encoder encoder; + char* rgb_target; + + if (xmin<0 || ymin<0 || xmax-xmin+1>iw || ymax-ymin+1>ih) return; + + rw = xmax-xmin+1; + rh = ymax-ymin+1; + + rgb_size = 4*rw*rh; + rgb_data = (unsigned char*)malloc(rgb_size); + if (!rgb_data) return; + + d = 0; + for (i=ymax; i>=ymin; i--) + { + for (j=xmin; j<=xmax; j++) + { + rgb_data[d] = r[i*iw+j]; d++; + rgb_data[d] = g[i*iw+j]; d++; + rgb_data[d] = b[i*iw+j]; d++; + rgb_data[d] = (unsigned char)0xFF; d++; + } + } + + LodePNG_Encoder_init(&encoder); + LodePNG_encode(&encoder, &rgb_buffer, &(size_t)buffer_size, rgb_data, rw, rh); + + target_size = (buffer_size+2)/3*4+1; + rgb_target = (char*)malloc(target_size); + base64_encode(rgb_buffer, buffer_size, rgb_target, target_size); + + if (ctxcanvas->canvas->use_matrix) /* Transformation active */ + fprintf(ctxcanvas->file, "<image transform=\"matrix(%d %d %d %d %d %d)\" width=\"%d\" height=\"%d\" xlink:href=\"data:image/png;base64,%s\"/>\n", + 1, 0, 0, -1, x, y+h, w, h, rgb_target); + else + fprintf(ctxcanvas->file, "<image transform=\"matrix(%d %d %d %d %d %d)\" width=\"%d\" height=\"%d\" xlink:href=\"data:image/png;base64,%s\"/>\n", + 1, 0, 0, 1, x, y-h, w, h, rgb_target); + + free(rgb_data); + free(rgb_buffer); + free(rgb_target); + LodePNG_Encoder_cleanup(&encoder); +} + +static void cdputimagerectrgba(cdCtxCanvas *ctxcanvas, int iw, int ih, const unsigned char *r, const unsigned char *g, const unsigned char *b, const unsigned char *a, int x, int y, int w, int h, int xmin, int xmax, int ymin, int ymax) +{ + int i, j, d, rw, rh, rgb_size, buffer_size, target_size; + unsigned char* rgb_data, *rgb_buffer; + LodePNG_Encoder encoder; + char* rgb_target; + + if (xmin<0 || ymin<0 || xmax-xmin+1>iw || ymax-ymin+1>ih) return; + + rw = xmax-xmin+1; + rh = ymax-ymin+1; + + rgb_size = 4*rw*rh; + rgb_data = (unsigned char*)malloc(rgb_size); + if (!rgb_data) return; + + d = 0; + for (i=ymax; i>=ymin; i--) + { + for (j=xmin; j<=xmax; j++) + { + rgb_data[d] = r[i*iw+j]; d++; + rgb_data[d] = g[i*iw+j]; d++; + rgb_data[d] = b[i*iw+j]; d++; + rgb_data[d] = a[i*iw+j]; d++; + } + } + + LodePNG_Encoder_init(&encoder); + LodePNG_encode(&encoder, &rgb_buffer, &(size_t)buffer_size, rgb_data, rw, rh); + + target_size = (buffer_size+2)/3*4+1; + rgb_target = (char*)malloc(target_size); + base64_encode(rgb_buffer, buffer_size, rgb_target, target_size); + + if (ctxcanvas->canvas->use_matrix) /* Transformation active */ + fprintf(ctxcanvas->file, "<image transform=\"matrix(%d %d %d %d %d %d)\" width=\"%d\" height=\"%d\" xlink:href=\"data:image/png;base64,%s\"/>\n", + 1, 0, 0, -1, x, y+h, w, h, rgb_target); + else + fprintf(ctxcanvas->file, "<image transform=\"matrix(%d %d %d %d %d %d)\" width=\"%d\" height=\"%d\" xlink:href=\"data:image/png;base64,%s\"/>\n", + 1, 0, 0, 1, x, y-h, w, h, rgb_target); + + free(rgb_data); + free(rgb_buffer); + free(rgb_target); + LodePNG_Encoder_cleanup(&encoder); +} + +static void cdputimagerectmap(cdCtxCanvas *ctxcanvas, int iw, int ih, const unsigned char *index, const long int *colors, int x, int y, int w, int h, int xmin, int xmax, int ymin, int ymax) +{ + int i, j, d, rw, rh, rgb_size, buffer_size, target_size; + unsigned char* rgb_data, *rgb_buffer; + LodePNG_Encoder encoder; + char* rgb_target; + + if (xmin<0 || ymin<0 || xmax-xmin+1>iw || ymax-ymin+1>ih) return; + + rw = xmax-xmin+1; + rh = ymax-ymin+1; + + rgb_size = 4*rw*rh; + rgb_data = (unsigned char*)malloc(rgb_size); + if (!rgb_data) return; + + d = 0; + for (i=ymax; i>=ymin; i--) + { + for (j=xmin; j<=xmax; j++) + { + unsigned char r, g, b; + cdDecodeColor(colors[index[i*iw+j]], &r, &g, &b); + rgb_data[d] = r; d++; + rgb_data[d] = g; d++; + rgb_data[d] = b; d++; + rgb_data[d] = (unsigned char)0xFF; d++; + } + } + + LodePNG_Encoder_init(&encoder); + LodePNG_encode(&encoder, &rgb_buffer, &(size_t)buffer_size, rgb_data, rw, rh); + + target_size = (buffer_size+2)/3*4+1; + rgb_target = (char*)malloc(target_size); + base64_encode(rgb_buffer, buffer_size, rgb_target, target_size); + + if (ctxcanvas->canvas->use_matrix) /* Transformation active */ + fprintf(ctxcanvas->file, "<image transform=\"matrix(%d %d %d %d %d %d)\" width=\"%d\" height=\"%d\" xlink:href=\"data:image/png;base64,%s\"/>\n", + 1, 0, 0, -1, x, y+h, w, h, rgb_target); + else + fprintf(ctxcanvas->file, "<image transform=\"matrix(%d %d %d %d %d %d)\" width=\"%d\" height=\"%d\" xlink:href=\"data:image/png;base64,%s\"/>\n", + 1, 0, 0, 1, x, y-h, w, h, rgb_target); + + free(rgb_data); + free(rgb_buffer); + free(rgb_target); + LodePNG_Encoder_cleanup(&encoder); +} + +static void cdpixel(cdCtxCanvas *ctxcanvas, int x, int y, long int color) +{ + unsigned char r, g, b; + cdDecodeColor(color, &r, &g, &b); + + fprintf(ctxcanvas->file, "<circle cx=\"%d\" cy=\"%d\" r=\"0.1\" style=\"fill:rgb(%d,%d,%d); stroke:rgb(%d,%d,%d); stroke-width:%d; stroke-linecap:%s; stroke-linejoin:%s; stroke-dasharray:%s; opacity:%d\" />\n", + x, y, r, g, b, r, g, b, ctxcanvas->linewidth, ctxcanvas->linecap, ctxcanvas->linejoin, ctxcanvas->linestyle, ctxcanvas->backopacity); +} + +static void cdcreatecanvas(cdCanvas *canvas, void *data) +{ + char filename[10240] = ""; + char* strdata = (char*)data; + double w_mm = INT_MAX*3.78, h_mm = INT_MAX*3.78, res = 3.78; + cdCtxCanvas* ctxcanvas; + int size; + + strdata += cdGetFileName(strdata, filename); + if (filename[0] == 0) + return; + + sscanf(strdata, "%lgx%lg %lg", &w_mm, &h_mm, &res); + + ctxcanvas = (cdCtxCanvas *)malloc(sizeof(cdCtxCanvas)); + memset(ctxcanvas, 0, sizeof(cdCtxCanvas)); + + ctxcanvas->file = fopen(filename, "w"); + if (!ctxcanvas->file) + { + free(ctxcanvas); + return; + } + + size = strlen(filename); + ctxcanvas->filename = malloc(size+1); + memcpy(ctxcanvas->filename, filename, size+1); + + /* store the base canvas */ + ctxcanvas->canvas = canvas; + + /* update canvas context */ + canvas->w = (int)(w_mm * res); + canvas->h = (int)(h_mm * res); + canvas->w_mm = w_mm; + canvas->h_mm = h_mm; + canvas->bpp = 24; + canvas->xres = res; + canvas->yres = res; + canvas->invert_yaxis = 1; + + /* update canvas context */ + canvas->ctxcanvas = ctxcanvas; + + ctxcanvas->last_fill_mode = -1; + ctxcanvas->last_clip_path = -1; + + ctxcanvas->clip_off_control = 0; + ctxcanvas->transform_control = 0; + + ctxcanvas->clip_polygon = 0; + ctxcanvas->hatchboxsize = 8; + + fprintf(ctxcanvas->file, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"); + fprintf(ctxcanvas->file, "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"%dpt\" height=\"%dpt\" viewBox=\"0 0 %d %d\" version=\"1.1\">\n", canvas->w, canvas->h, canvas->w, canvas->h); + fprintf(ctxcanvas->file, "<g>\n"); +} + +static void cdinittable(cdCanvas* canvas) +{ + canvas->cxPixel = cdpixel; + canvas->cxLine = cdline; + canvas->cxPoly = cdpoly; + canvas->cxRect = cdrect; + canvas->cxBox = cdbox; + canvas->cxArc = cdarc; + canvas->cxSector = cdsector; + canvas->cxChord = cdchord; + canvas->cxText = cdtext; + canvas->cxClip = cdclip; + canvas->cxClipArea = cdcliparea; + canvas->cxFont = cdfont; + + canvas->cxPutImageRectRGB = cdputimagerectrgb; + canvas->cxPutImageRectRGBA = cdputimagerectrgba; + canvas->cxPutImageRectMap = cdputimagerectmap; + + canvas->cxFLine = cdfline; + canvas->cxFPoly = cdfpoly; + canvas->cxFRect = cdfrect; + canvas->cxFBox = cdfbox; + canvas->cxFArc = cdfarc; + canvas->cxFSector = cdfsector; + canvas->cxFChord = cdfchord; + canvas->cxFText = cdftext; + canvas->cxFClipArea = cdfcliparea; + + canvas->cxBackOpacity = cdbackopacity; + canvas->cxLineStyle = cdlinestyle; + canvas->cxLineWidth = cdlinewidth; + canvas->cxLineCap = cdlinecap; + canvas->cxLineJoin = cdlinejoin; + + canvas->cxHatch = cdhatch; + canvas->cxStipple = cdstipple; + canvas->cxPattern = cdpattern; + + canvas->cxBackground = cdbackground; + canvas->cxForeground = cdforeground; + + canvas->cxTransform = cdtransform; + + canvas->cxKillCanvas = (void (*)(cdCtxCanvas*))cdkillcanvas; +} + +static cdContext cdSVGContext = +{ + CD_CAP_ALL & ~(CD_CAP_CLEAR | CD_CAP_FLUSH | CD_CAP_PLAY | CD_CAP_PALETTE | + CD_CAP_REGION | CD_CAP_IMAGESRV | CD_CAP_WRITEMODE | + CD_CAP_FONTDIM | CD_CAP_TEXTSIZE | + CD_CAP_IMAGERGBA | CD_CAP_GETIMAGERGB), + 0, + cdcreatecanvas, + cdinittable, + NULL, + NULL, +}; + +cdContext* cdContextSVG(void) +{ + return &cdSVGContext; +} diff --git a/src/svg/lodepng.c b/src/svg/lodepng.c new file mode 100644 index 0000000..bdc46fe --- /dev/null +++ b/src/svg/lodepng.c @@ -0,0 +1,4319 @@ +/* +LodePNG version 20080927 + +Copyright (c) 2005-2008 Lode Vandevenne + +This software is provided 'as-is', without any express or implied +warranty. In no event will the authors be held liable for any damages +arising from the use of this software. + +Permission is granted to anyone to use this software for any purpose, +including commercial applications, and to alter it and redistribute it +freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + + 3. This notice may not be removed or altered from any source + distribution. +*/ + +/* +The manual and changelog can be found in the header file "lodepng.h" +You are free to name this file lodepng.cpp or lodepng.c depending on your usage. +*/ + +#include "lodepng.h" + +#define VERSION_STRING "20080927" + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Tools For C / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +/* +About these tools (vector, uivector, ucvector and string): +-LodePNG was originally written in C++. The vectors replace the std::vectors that were used in the C++ version. +-The string tools are made to avoid problems with compilers that declare things like strncat as deprecated. +-They're not used in the interface, only internally in this file, so all their functions are made static. +*/ + +#ifdef LODEPNG_COMPILE_ZLIB +#ifdef LODEPNG_COMPILE_ENCODER + +typedef struct vector /*this one is used only by the deflate compressor*/ +{ + void* data; + size_t size; /*in groups of bytes depending on type*/ + size_t allocsize; /*in bytes*/ + unsigned typesize; /*sizeof the type you store in data*/ +} vector; + +static unsigned vector_resize(vector* p, size_t size) /*returns 1 if success, 0 if failure ==> nothing done*/ +{ + if(size * p->typesize > p->allocsize) + { + size_t newsize = size * p->typesize * 2; + void* data = realloc(p->data, newsize); + if(data) + { + p->allocsize = newsize; + p->data = data; + p->size = size; + } + else return 0; + } + else p->size = size; + return 1; +} + +static unsigned vector_resized(vector* p, size_t size, void dtor(void*)) /*resize and use destructor on elements if it gets smaller*/ +{ + size_t i; + if(size < p->size) for(i = size; i < p->size; i++) dtor(&((char*)(p->data))[i * p->typesize]); + return vector_resize(p, size); +} + +static void vector_cleanup(void* p) +{ + ((vector*)p)->size = ((vector*)p)->allocsize = 0; + free(((vector*)p)->data); + ((vector*)p)->data = NULL; +} + +static void vector_cleanupd(vector* p, void dtor(void*)) /*clear and use destructor on elements*/ +{ + vector_resized(p, 0, dtor); + vector_cleanup(p); +} + +static void vector_init(vector* p, unsigned typesize) +{ + p->data = NULL; + p->size = p->allocsize = 0; + p->typesize = typesize; +} + +static void vector_swap(vector* p, vector* q) /*they're supposed to have the same typesize*/ +{ + size_t tmp; + void* tmpp; + tmp = p->size; p->size = q->size; q->size = tmp; + tmp = p->allocsize; p->allocsize = q->allocsize; q->allocsize = tmp; + tmpp = p->data; p->data = q->data; q->data = tmpp; +} + +static void* vector_get(vector* p, size_t index) +{ + return &((char*)p->data)[index * p->typesize]; +} +#endif /*LODEPNG_COMPILE_ENCODER*/ +#endif /*LODEPNG_COMPILE_ZLIB*/ + +/* /////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_ZLIB +typedef struct uivector +{ + unsigned* data; + size_t size; /*size in number of unsigned longs*/ + size_t allocsize; /*allocated size in bytes*/ +} uivector; + +static void uivector_cleanup(void* p) +{ + ((uivector*)p)->size = ((uivector*)p)->allocsize = 0; + free(((uivector*)p)->data); + ((uivector*)p)->data = NULL; +} + +static unsigned uivector_resize(uivector* p, size_t size) /*returns 1 if success, 0 if failure ==> nothing done*/ +{ + if(size * sizeof(unsigned) > p->allocsize) + { + size_t newsize = size * sizeof(unsigned) * 2; + void* data = realloc(p->data, newsize); + if(data) + { + p->allocsize = newsize; + p->data = (unsigned*)data; + p->size = size; + } + else return 0; + } + else p->size = size; + return 1; +} + +static unsigned uivector_resizev(uivector* p, size_t size, unsigned value) /*resize and give all new elements the value*/ +{ + size_t oldsize = p->size, i; + if(!uivector_resize(p, size)) return 0; + for(i = oldsize; i < size; i++) p->data[i] = value; + return 1; +} + +static void uivector_init(uivector* p) +{ + p->data = NULL; + p->size = p->allocsize = 0; +} + +#ifdef LODEPNG_COMPILE_ENCODER +static unsigned uivector_push_back(uivector* p, unsigned c) /*returns 1 if success, 0 if failure ==> nothing done*/ +{ + if(!uivector_resize(p, p->size + 1)) return 0; + p->data[p->size - 1] = c; + return 1; +} + +static unsigned uivector_copy(uivector* p, const uivector* q) /*copy q to p, returns 1 if success, 0 if failure ==> nothing done*/ +{ + size_t i; + if(!uivector_resize(p, q->size)) return 0; + for(i = 0; i < q->size; i++) p->data[i] = q->data[i]; + return 1; +} + +static void uivector_swap(uivector* p, uivector* q) +{ + size_t tmp; + unsigned* tmpp; + tmp = p->size; p->size = q->size; q->size = tmp; + tmp = p->allocsize; p->allocsize = q->allocsize; q->allocsize = tmp; + tmpp = p->data; p->data = q->data; q->data = tmpp; +} +#endif /*LODEPNG_COMPILE_ENCODER*/ +#endif /*LODEPNG_COMPILE_ZLIB*/ + +/* /////////////////////////////////////////////////////////////////////////// */ + +typedef struct ucvector +{ + unsigned char* data; + size_t size; /*used size*/ + size_t allocsize; /*allocated size*/ +} ucvector; + +static void ucvector_cleanup(void* p) +{ + ((ucvector*)p)->size = ((ucvector*)p)->allocsize = 0; + free(((ucvector*)p)->data); + ((ucvector*)p)->data = NULL; +} + +static unsigned ucvector_resize(ucvector* p, size_t size) /*returns 1 if success, 0 if failure ==> nothing done*/ +{ + if(size * sizeof(unsigned) > p->allocsize) + { + size_t newsize = size * sizeof(unsigned) * 2; + void* data = realloc(p->data, newsize); + if(data) + { + p->allocsize = newsize; + p->data = (unsigned char*)data; + p->size = size; + } + else return 0; /*error: not enough memory*/ + } + else p->size = size; + return 1; +} + +#ifdef LODEPNG_COMPILE_DECODER +#ifdef LODEPNG_COMPILE_PNG +static unsigned ucvector_resizev(ucvector* p, size_t size, unsigned char value) /*resize and give all new elements the value*/ +{ + size_t oldsize = p->size, i; + if(!ucvector_resize(p, size)) return 0; + for(i = oldsize; i < size; i++) p->data[i] = value; + return 1; +} +#endif /*LODEPNG_COMPILE_PNG*/ +#endif /*LODEPNG_COMPILE_DECODER*/ + +static void ucvector_init(ucvector* p) +{ + p->data = NULL; + p->size = p->allocsize = 0; +} + +#ifdef LODEPNG_COMPILE_ZLIB +/*you can both convert from vector to buffer&size and vica versa*/ +static void ucvector_init_buffer(ucvector* p, unsigned char* buffer, size_t size) +{ + p->data = buffer; + p->allocsize = p->size = size; +} +#endif /*LODEPNG_COMPILE_ZLIB*/ + +static unsigned ucvector_push_back(ucvector* p, unsigned char c) /*returns 1 if success, 0 if failure ==> nothing done*/ +{ + if(!ucvector_resize(p, p->size + 1)) return 0; + p->data[p->size - 1] = c; + return 1; +} + +/* /////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_PNG +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS +static unsigned string_resize(char** out, size_t size) /*returns 1 if success, 0 if failure ==> nothing done*/ +{ + char* data = (char*)realloc(*out, size + 1); + if(data) + { + data[size] = 0; /*null termination char*/ + *out = data; + } + return data != 0; +} + +static void string_init(char** out) /*init a {char*, size_t} pair for use as string*/ +{ + *out = NULL; + string_resize(out, 0); +} + +static void string_cleanup(char** out) /*free the above pair again*/ +{ + free(*out); + *out = NULL; +} + +static void string_set(char** out, const char* in) +{ + size_t insize = strlen(in), i = 0; + if(string_resize(out, insize)) for(i = 0; i < insize; i++) (*out)[i] = in[i]; +} +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +#endif /*LODEPNG_COMPILE_PNG*/ + +#ifdef LODEPNG_COMPILE_ZLIB + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Reading and writing single bits and bytes from/to stream for Deflate / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_ENCODER +static void addBitToStream(size_t* bitpointer, ucvector* bitstream, unsigned char bit) +{ + if((*bitpointer) % 8 == 0) ucvector_push_back(bitstream, 0); /*add a new byte at the end*/ + (bitstream->data[bitstream->size - 1]) |= (bit << ((*bitpointer) & 0x7)); /*earlier bit of huffman code is in a lesser significant bit of an earlier byte*/ + (*bitpointer)++; +} + +static void addBitsToStream(size_t* bitpointer, ucvector* bitstream, unsigned value, size_t nbits) +{ + size_t i; + for(i = 0; i < nbits; i++) addBitToStream(bitpointer, bitstream, (unsigned char)((value >> i) & 1)); +} + +static void addBitsToStreamReversed(size_t* bitpointer, ucvector* bitstream, unsigned value, size_t nbits) +{ + size_t i; + for(i = 0; i < nbits; i++) addBitToStream(bitpointer, bitstream, (unsigned char)((value >> (nbits - 1 - i)) & 1)); +} +#endif /*LODEPNG_COMPILE_ENCODER*/ + +#ifdef LODEPNG_COMPILE_DECODER +static unsigned char readBitFromStream(size_t* bitpointer, const unsigned char* bitstream) +{ + unsigned char result = (unsigned char)((bitstream[(*bitpointer) >> 3] >> ((*bitpointer) & 0x7)) & 1); + (*bitpointer)++; + return result; +} + +static unsigned readBitsFromStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits) +{ + unsigned result = 0, i; + for(i = 0; i < nbits; i++) result += ((unsigned)readBitFromStream(bitpointer, bitstream)) << i; + return result; +} +#endif /*LODEPNG_COMPILE_DECODER*/ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Deflate - Huffman / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#define FIRST_LENGTH_CODE_INDEX 257 +#define LAST_LENGTH_CODE_INDEX 285 +#define NUM_DEFLATE_CODE_SYMBOLS 288 /*256 literals, the end code, some length codes, and 2 unused codes*/ +#define NUM_DISTANCE_SYMBOLS 32 /*the distance codes have their own symbols, 30 used, 2 unused*/ +#define NUM_CODE_LENGTH_CODES 19 /*the code length codes. 0-15: code lengths, 16: copy previous 3-6 times, 17: 3-10 zeros, 18: 11-138 zeros*/ + +static const unsigned LENGTHBASE[29] /*the base lengths represented by codes 257-285*/ + = {3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258}; +static const unsigned LENGTHEXTRA[29] /*the extra bits used by codes 257-285 (added to base length)*/ + = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0}; +static const unsigned DISTANCEBASE[30] /*the base backwards distances (the bits of distance codes appear after length codes and use their own huffman tree)*/ + = {1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577}; +static const unsigned DISTANCEEXTRA[30] /*the extra bits of backwards distances (added to base)*/ + = {0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13}; +static const unsigned CLCL[NUM_CODE_LENGTH_CODES] /*the order in which "code length alphabet code lengths" are stored, out of this the huffman tree of the dynamic huffman tree lengths is generated*/ + = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; + +/* /////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_ENCODER +/*terminology used for the package-merge algorithm and the coin collector's problem*/ +typedef struct Coin /*a coin can be multiple coins (when they're merged)*/ +{ + uivector symbols; + float weight; /*the sum of all weights in this coin*/ +} Coin; + +static void Coin_init(Coin* c) +{ + uivector_init(&c->symbols); +} + +static void Coin_cleanup(void* c) /*void* so that this dtor can be given as function pointer to the vector resize function*/ +{ + uivector_cleanup(&((Coin*)c)->symbols); +} + +static void Coin_copy(Coin* c1, const Coin* c2) +{ + c1->weight = c2->weight; + uivector_copy(&c1->symbols, &c2->symbols); +} + +static void addCoins(Coin* c1, const Coin* c2) +{ + unsigned i; + for(i = 0; i < c2->symbols.size; i++) uivector_push_back(&c1->symbols, c2->symbols.data[i]); + c1->weight += c2->weight; +} + +static void Coin_sort(Coin* data, size_t amount) /*combsort*/ +{ + size_t gap = amount; + unsigned char swapped = 0; + while(gap > 1 || swapped) + { + size_t i; + gap = (gap * 10) / 13; /*shrink factor 1.3*/ + if(gap == 9 || gap == 10) gap = 11; /*combsort11*/ + if(gap < 1) gap = 1; + swapped = 0; + for(i = 0; i < amount - gap; i++) + { + size_t j = i + gap; + if(data[j].weight < data[i].weight) + { + float temp = data[j].weight; data[j].weight = data[i].weight; data[i].weight = temp; + uivector_swap(&data[i].symbols, &data[j].symbols); + swapped = 1; + } + } + } +} +#endif /*LODEPNG_COMPILE_ENCODER*/ + +typedef struct HuffmanTree +{ + uivector tree2d; + uivector tree1d; + uivector lengths; /*the lengths of the codes of the 1d-tree*/ + unsigned maxbitlen; /*maximum number of bits a single code can get*/ + unsigned numcodes; /*number of symbols in the alphabet = number of codes*/ +} HuffmanTree; + +/*function used for debug purposes*/ +/*#include <iostream> +static void HuffmanTree_draw(HuffmanTree* tree) +{ + std::cout << "tree. length: " << tree->numcodes << " maxbitlen: " << tree->maxbitlen << std::endl; + for(size_t i = 0; i < tree->tree1d.size; i++) + { + if(tree->lengths.data[i]) + std::cout << i << " " << tree->tree1d.data[i] << " " << tree->lengths.data[i] << std::endl; + } + std::cout << std::endl; +}*/ + +static void HuffmanTree_init(HuffmanTree* tree) +{ + uivector_init(&tree->tree2d); + uivector_init(&tree->tree1d); + uivector_init(&tree->lengths); +} + +static void HuffmanTree_cleanup(HuffmanTree* tree) +{ + uivector_cleanup(&tree->tree2d); + uivector_cleanup(&tree->tree1d); + uivector_cleanup(&tree->lengths); +} + +/*the tree representation used by the decoder. return value is error*/ +static unsigned HuffmanTree_make2DTree(HuffmanTree* tree) +{ + unsigned nodefilled = 0; /*up to which node it is filled*/ + unsigned treepos = 0; /*position in the tree (1 of the numcodes columns)*/ + unsigned n, i; + + if(!uivector_resize(&tree->tree2d, tree->numcodes * 2)) return 9901; /*if failed return not enough memory error*/ + /*convert tree1d[] to tree2d[][]. In the 2D array, a value of 32767 means uninited, a value >= numcodes is an address to another bit, a value < numcodes is a code. The 2 rows are the 2 possible bit values (0 or 1), there are as many columns as codes - 1 + a good huffmann tree has N * 2 - 1 nodes, of which N - 1 are internal nodes. Here, the internal nodes are stored (what their 0 and 1 option point to). There is only memory for such good tree currently, if there are more nodes (due to too long length codes), error 55 will happen*/ + for(n = 0; n < tree->numcodes * 2; n++) tree->tree2d.data[n] = 32767; /*32767 here means the tree2d isn't filled there yet*/ + + for(n = 0; n < tree->numcodes; n++) /*the codes*/ + for(i = 0; i < tree->lengths.data[n]; i++) /*the bits for this code*/ + { + unsigned char bit = (unsigned char)((tree->tree1d.data[n] >> (tree->lengths.data[n] - i - 1)) & 1); + if(treepos > tree->numcodes - 2) return 55; /*error 55: oversubscribed; see description in header*/ + if(tree->tree2d.data[2 * treepos + bit] == 32767) /*not yet filled in*/ + { + if(i + 1 == tree->lengths.data[n]) /*last bit*/ + { + tree->tree2d.data[2 * treepos + bit] = n; /*put the current code in it*/ + treepos = 0; + } + else /*put address of the next step in here, first that address has to be found of course (it's just nodefilled + 1)...*/ + { + nodefilled++; + tree->tree2d.data[2 * treepos + bit] = nodefilled + tree->numcodes; /*addresses encoded with numcodes added to it*/ + treepos = nodefilled; + } + } + else treepos = tree->tree2d.data[2 * treepos + bit] - tree->numcodes; + } + for(n = 0; n < tree->numcodes * 2; n++) if(tree->tree2d.data[n] == 32767) tree->tree2d.data[n] = 0; /*remove possible remaining 32767's*/ + + return 0; +} + +static unsigned HuffmanTree_makeFromLengths2(HuffmanTree* tree) /*given that numcodes, lengths and maxbitlen are already filled in correctly. return value is error.*/ +{ + uivector blcount; + uivector nextcode; + unsigned bits, n, error = 0; + + uivector_init(&blcount); + uivector_init(&nextcode); + if(!uivector_resize(&tree->tree1d, tree->numcodes) + || !uivector_resizev(&blcount, tree->maxbitlen + 1, 0) + || !uivector_resizev(&nextcode, tree->maxbitlen + 1, 0)) + error = 9902; + + if(!error) + { + /*step 1: count number of instances of each code length*/ + for(bits = 0; bits < tree->numcodes; bits++) blcount.data[tree->lengths.data[bits]]++; + /*step 2: generate the nextcode values*/ + for(bits = 1; bits <= tree->maxbitlen; bits++) nextcode.data[bits] = (nextcode.data[bits - 1] + blcount.data[bits - 1]) << 1; + /*step 3: generate all the codes*/ + for(n = 0; n < tree->numcodes; n++) if(tree->lengths.data[n] != 0) tree->tree1d.data[n] = nextcode.data[tree->lengths.data[n]]++; + } + + uivector_cleanup(&blcount); + uivector_cleanup(&nextcode); + + if(!error) return HuffmanTree_make2DTree(tree); + else return error; +} + +/*given the code lengths (as stored in the PNG file), generate the tree as defined by Deflate. maxbitlen is the maximum bits that a code in the tree can have. return value is error.*/ +static unsigned HuffmanTree_makeFromLengths(HuffmanTree* tree, const unsigned* bitlen, size_t numcodes, unsigned maxbitlen) +{ + unsigned i; + if(!uivector_resize(&tree->lengths, numcodes)) return 9903; + for(i = 0; i < numcodes; i++) tree->lengths.data[i] = bitlen[i]; + tree->numcodes = (unsigned)numcodes; /*number of symbols*/ + tree->maxbitlen = maxbitlen; + return HuffmanTree_makeFromLengths2(tree); +} + +#ifdef LODEPNG_COMPILE_ENCODER +static unsigned HuffmanTree_fillInCoins(vector* coins, const unsigned* frequencies, unsigned numcodes, size_t sum) +{ + unsigned i; + for(i = 0; i < numcodes; i++) + { + Coin* coin; + if(frequencies[i] == 0) continue; /*it's important to exclude symbols that aren't present*/ + if(!vector_resize(coins, coins->size + 1)) { vector_cleanup(coins); return 9904; } + coin = (Coin*)(vector_get(coins, coins->size - 1)); + Coin_init(coin); + coin->weight = frequencies[i] / (float)sum; + uivector_push_back(&coin->symbols, i); + } + if(coins->size) Coin_sort((Coin*)coins->data, coins->size); + return 0; +} + +static unsigned HuffmanTree_makeFromFrequencies(HuffmanTree* tree, const unsigned* frequencies, size_t numcodes, unsigned maxbitlen) +{ + unsigned i, j; + size_t sum = 0, numpresent = 0; + unsigned error = 0; + + vector prev_row; /*type Coin, the previous row of coins*/ + vector coins; /*type Coin, the coins of the currently calculated row*/ + + tree->maxbitlen = maxbitlen; + + for(i = 0; i < numcodes; i++) + { + if(frequencies[i] > 0) + { + numpresent++; + sum += frequencies[i]; + } + } + + if(numcodes == 0) return 80; /*error: a tree of 0 symbols is not supposed to be made*/ + tree->numcodes = (unsigned)numcodes; /*number of symbols*/ + uivector_resize(&tree->lengths, 0); + if(!uivector_resizev(&tree->lengths, tree->numcodes, 0)) return 9905; + + if(numpresent == 0) /*there are no symbols at all, in that case add one symbol of value 0 to the tree (see RFC 1951 section 3.2.7) */ + { + tree->lengths.data[0] = 1; + return HuffmanTree_makeFromLengths2(tree); + } + else if(numpresent == 1) /*the package merge algorithm gives wrong results if there's only one symbol (theoretically 0 bits would then suffice, but we need a proper symbol for zlib)*/ + { + for(i = 0; i < numcodes; i++) if(frequencies[i]) tree->lengths.data[i] = 1; + return HuffmanTree_makeFromLengths2(tree); + } + + vector_init(&coins, sizeof(Coin)); + vector_init(&prev_row, sizeof(Coin)); + + /*Package-Merge algorithm represented by coin collector's problem + For every symbol, maxbitlen coins will be created*/ + + /*first row, lowest denominator*/ + error = HuffmanTree_fillInCoins(&coins, frequencies, tree->numcodes, sum); + if(!error) + { + for(j = 1; j <= maxbitlen && !error; j++) /*each of the remaining rows*/ + { + vector_swap(&coins, &prev_row); /*swap instead of copying*/ + if(!vector_resized(&coins, 0, Coin_cleanup)) { error = 9906; break; } + + for(i = 0; i + 1 < prev_row.size; i += 2) + { + if(!vector_resize(&coins, coins.size + 1)) { error = 9907; break; } + Coin_init((Coin*)vector_get(&coins, coins.size - 1)); + Coin_copy((Coin*)vector_get(&coins, coins.size - 1), (Coin*)vector_get(&prev_row, i)); + addCoins((Coin*)vector_get(&coins, coins.size - 1), (Coin*)vector_get(&prev_row, i + 1)); /*merge the coins into packages*/ + } + if(j < maxbitlen) + { + error = HuffmanTree_fillInCoins(&coins, frequencies, tree->numcodes, sum); + } + } + } + + if(!error) + { + /*keep the coins with lowest weight, so that they add up to the amount of symbols - 1*/ + vector_resized(&coins, numpresent - 1, Coin_cleanup); + + /*calculate the lenghts of each symbol, as the amount of times a coin of each symbol is used*/ + for(i = 0; i < coins.size; i++) + { + Coin* coin = (Coin*)vector_get(&coins, i); + for(j = 0; j < coin->symbols.size; j++) tree->lengths.data[coin->symbols.data[j]]++; + } + + error = HuffmanTree_makeFromLengths2(tree); + } + + vector_cleanupd(&coins, Coin_cleanup); + vector_cleanupd(&prev_row, Coin_cleanup); + + return error; +} + +static unsigned HuffmanTree_getCode(const HuffmanTree* tree, unsigned index) { return tree->tree1d.data[index]; } +static unsigned HuffmanTree_getLength(const HuffmanTree* tree, unsigned index) { return tree->lengths.data[index]; } +#endif /*LODEPNG_COMPILE_ENCODER*/ + +/*get the tree of a deflated block with fixed tree, as specified in the deflate specification*/ +static unsigned generateFixedTree(HuffmanTree* tree) +{ + unsigned i, error = 0; + uivector bitlen; + uivector_init(&bitlen); + if(!uivector_resize(&bitlen, NUM_DEFLATE_CODE_SYMBOLS)) error = 9909; + + if(!error) + { + /*288 possible codes: 0-255=literals, 256=endcode, 257-285=lengthcodes, 286-287=unused*/ + for(i = 0; i <= 143; i++) bitlen.data[i] = 8; + for(i = 144; i <= 255; i++) bitlen.data[i] = 9; + for(i = 256; i <= 279; i++) bitlen.data[i] = 7; + for(i = 280; i <= 287; i++) bitlen.data[i] = 8; + + error = HuffmanTree_makeFromLengths(tree, bitlen.data, NUM_DEFLATE_CODE_SYMBOLS, 15); + } + + uivector_cleanup(&bitlen); + return error; +} + +static unsigned generateDistanceTree(HuffmanTree* tree) +{ + unsigned i, error = 0; + uivector bitlen; + uivector_init(&bitlen); + if(!uivector_resize(&bitlen, NUM_DISTANCE_SYMBOLS)) error = 9910; + + /*there are 32 distance codes, but 30-31 are unused*/ + if(!error) + { + for(i = 0; i < NUM_DISTANCE_SYMBOLS; i++) bitlen.data[i] = 5; + error = HuffmanTree_makeFromLengths(tree, bitlen.data, NUM_DISTANCE_SYMBOLS, 15); + } + uivector_cleanup(&bitlen); + return error; +} + +#ifdef LODEPNG_COMPILE_DECODER +/*Decodes a symbol from the tree +if decoded is true, then result contains the symbol, otherwise it contains something unspecified (because the symbol isn't fully decoded yet) +bit is the bit that was just read from the stream +you have to decode a full symbol (let the decode function return true) before you can try to decode another one, otherwise the state isn't reset +return value is error.*/ +static unsigned HuffmanTree_decode(const HuffmanTree* tree, unsigned* decoded, unsigned* result, unsigned* treepos, unsigned char bit) +{ + if((*treepos) >= tree->numcodes) return 11; /*error: it appeared outside the codetree*/ + + (*result) = tree->tree2d.data[2 * (*treepos) + bit]; + (*decoded) = ((*result) < tree->numcodes); + + if(*decoded) (*treepos) = 0; + else (*treepos) = (*result) - tree->numcodes; + + return 0; +} + +static unsigned huffmanDecodeSymbol(unsigned int* error, const unsigned char* in, size_t* bp, const HuffmanTree* codetree, size_t inlength) +{ + unsigned treepos = 0, decoded, ct; + for(;;) + { + unsigned char bit; + if(((*bp) & 0x07) == 0 && ((*bp) >> 3) > inlength) { *error = 10; return 0; } /*error: end of input memory reached without endcode*/ + bit = readBitFromStream(bp, in); + *error = HuffmanTree_decode(codetree, &decoded, &ct, &treepos, bit); + if(*error) return 0; /*stop, an error happened*/ + if(decoded) return ct; + } +} +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_DECODER + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Inflator / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +/*get the tree of a deflated block with fixed tree, as specified in the deflate specification*/ +static void getTreeInflateFixed(HuffmanTree* tree, HuffmanTree* treeD) +{ + /*error checking not done, this is fixed stuff, it works, it doesn't depend on the image*/ + generateFixedTree(tree); + generateDistanceTree(treeD); +} + +/*get the tree of a deflated block with dynamic tree, the tree itself is also Huffman compressed with a known tree*/ +static unsigned getTreeInflateDynamic(HuffmanTree* codetree, HuffmanTree* codetreeD, HuffmanTree* codelengthcodetree, + const unsigned char* in, size_t* bp, size_t inlength) +{ + /*make sure that length values that aren't filled in will be 0, or a wrong tree will be generated*/ + /*C-code note: use no "return" between ctor and dtor of an uivector!*/ + unsigned error = 0; + unsigned n, HLIT, HDIST, HCLEN, i; + uivector bitlen; + uivector bitlenD; + uivector codelengthcode; + + if((*bp) >> 3 >= inlength - 2) { return 49; } /*the bit pointer is or will go past the memory*/ + + HLIT = readBitsFromStream(bp, in, 5) + 257; /*number of literal/length codes + 257. Unlike the spec, the value 257 is added to it here already*/ + HDIST = readBitsFromStream(bp, in, 5) + 1; /*number of distance codes. Unlike the spec, the value 1 is added to it here already*/ + HCLEN = readBitsFromStream(bp, in, 4) + 4; /*number of code length codes. Unlike the spec, the value 4 is added to it here already*/ + + /*read the code length codes out of 3 * (amount of code length codes) bits*/ + uivector_init(&codelengthcode); + if(!uivector_resize(&codelengthcode, NUM_CODE_LENGTH_CODES)) error = 9911; + + if(!error) + { + for(i = 0; i < NUM_CODE_LENGTH_CODES; i++) + { + if(i < HCLEN) codelengthcode.data[CLCL[i]] = readBitsFromStream(bp, in, 3); + else codelengthcode.data[CLCL[i]] = 0; /*if not, it must stay 0*/ + } + + error = HuffmanTree_makeFromLengths(codelengthcodetree, codelengthcode.data, codelengthcode.size, 7); + } + + uivector_cleanup(&codelengthcode); + if(error) return error; + + /*now we can use this tree to read the lengths for the tree that this function will return*/ + uivector_init(&bitlen); + uivector_resizev(&bitlen, NUM_DEFLATE_CODE_SYMBOLS, 0); + uivector_init(&bitlenD); + uivector_resizev(&bitlenD, NUM_DISTANCE_SYMBOLS, 0); + i = 0; + if(!bitlen.data || !bitlenD.data) error = 9912; + else while(i < HLIT + HDIST) /*i is the current symbol we're reading in the part that contains the code lengths of lit/len codes and dist codes*/ + { + unsigned code = huffmanDecodeSymbol(&error, in, bp, codelengthcodetree, inlength); + if(error) break; + + if(code <= 15) /*a length code*/ + { + if(i < HLIT) bitlen.data[i] = code; + else bitlenD.data[i - HLIT] = code; + i++; + } + else if(code == 16) /*repeat previous*/ + { + unsigned replength = 3; /*read in the 2 bits that indicate repeat length (3-6)*/ + unsigned value; /*set value to the previous code*/ + + if((*bp) >> 3 >= inlength) { error = 50; break; } /*error, bit pointer jumps past memory*/ + + replength += readBitsFromStream(bp, in, 2); + + if((i - 1) < HLIT) value = bitlen.data[i - 1]; + else value = bitlenD.data[i - HLIT - 1]; + /*repeat this value in the next lengths*/ + for(n = 0; n < replength; n++) + { + if(i >= HLIT + HDIST) { error = 13; break; } /*error: i is larger than the amount of codes*/ + if(i < HLIT) bitlen.data[i] = value; + else bitlenD.data[i - HLIT] = value; + i++; + } + } + else if(code == 17) /*repeat "0" 3-10 times*/ + { + unsigned replength = 3; /*read in the bits that indicate repeat length*/ + if((*bp) >> 3 >= inlength) { error = 50; break; } /*error, bit pointer jumps past memory*/ + + replength += readBitsFromStream(bp, in, 3); + + /*repeat this value in the next lengths*/ + for(n = 0; n < replength; n++) + { + if(i >= HLIT + HDIST) { error = 14; break; } /*error: i is larger than the amount of codes*/ + if(i < HLIT) bitlen.data[i] = 0; + else bitlenD.data[i - HLIT] = 0; + i++; + } + } + else if(code == 18) /*repeat "0" 11-138 times*/ + { + unsigned replength = 11; /*read in the bits that indicate repeat length*/ + if((*bp) >> 3 >= inlength) { error = 50; break; } /*error, bit pointer jumps past memory*/ + replength += readBitsFromStream(bp, in, 7); + + /*repeat this value in the next lengths*/ + for(n = 0; n < replength; n++) + { + if(i >= HLIT + HDIST) { error = 15; break; } /*error: i is larger than the amount of codes*/ + if(i < HLIT) bitlen.data[i] = 0; + else bitlenD.data[i - HLIT] = 0; + i++; + } + } + else { error = 16; break; } /*error: somehow an unexisting code appeared. This can never happen.*/ + } + + if(!error && bitlen.data[256] == 0) { error = 64; } /*the length of the end code 256 must be larger than 0*/ + + /*now we've finally got HLIT and HDIST, so generate the code trees, and the function is done*/ + if(!error) error = HuffmanTree_makeFromLengths(codetree, &bitlen.data[0], bitlen.size, 15); + if(!error) error = HuffmanTree_makeFromLengths(codetreeD, &bitlenD.data[0], bitlenD.size, 15); + + uivector_cleanup(&bitlen); + uivector_cleanup(&bitlenD); + + return error; +} + +/*inflate a block with dynamic of fixed Huffman tree*/ +static unsigned inflateHuffmanBlock(ucvector* out, const unsigned char* in, size_t* bp, size_t* pos, size_t inlength, unsigned btype) +{ + unsigned endreached = 0, error = 0; + HuffmanTree codetree; /*287, the code tree for Huffman codes*/ + HuffmanTree codetreeD; /*31, the code tree for distance codes*/ + + HuffmanTree_init(&codetree); + HuffmanTree_init(&codetreeD); + + if(btype == 1) getTreeInflateFixed(&codetree, &codetreeD); + else if(btype == 2) + { + HuffmanTree codelengthcodetree; /*18, the code tree for code length codes*/ + HuffmanTree_init(&codelengthcodetree); + error = getTreeInflateDynamic(&codetree, &codetreeD, &codelengthcodetree, in, bp, inlength); + HuffmanTree_cleanup(&codelengthcodetree); + } + + while(!endreached && !error) + { + unsigned code = huffmanDecodeSymbol(&error, in, bp, &codetree, inlength); + if(error) break; /*some error happened in the above function*/ + if(code == 256) endreached = 1; /*end code*/ + else if(code <= 255) /*literal symbol*/ + { + if((*pos) >= out->size) ucvector_resize(out, ((*pos) + 1) * 2); /*reserve more room at once*/ + if((*pos) >= out->size) { error = 9913; break; } /*not enough memory*/ + out->data[(*pos)] = (unsigned char)(code); + (*pos)++; + } + else if(code >= FIRST_LENGTH_CODE_INDEX && code <= LAST_LENGTH_CODE_INDEX) /*length code*/ + { + /*part 1: get length base*/ + size_t length = LENGTHBASE[code - FIRST_LENGTH_CODE_INDEX]; + unsigned codeD, distance, numextrabitsD; + size_t start, forward, backward, numextrabits; + + /*part 2: get extra bits and add the value of that to length*/ + numextrabits = LENGTHEXTRA[code - FIRST_LENGTH_CODE_INDEX]; + if(((*bp) >> 3) >= inlength) { error = 51; break; } /*error, bit pointer will jump past memory*/ + length += readBitsFromStream(bp, in, numextrabits); + + /*part 3: get distance code*/ + codeD = huffmanDecodeSymbol(&error, in, bp, &codetreeD, inlength); + if(error) break; + if(codeD > 29) { error = 18; break; } /*error: invalid distance code (30-31 are never used)*/ + distance = DISTANCEBASE[codeD]; + + /*part 4: get extra bits from distance*/ + numextrabitsD = DISTANCEEXTRA[codeD]; + if(((*bp) >> 3) >= inlength) { error = 51; break; } /*error, bit pointer will jump past memory*/ + distance += readBitsFromStream(bp, in, numextrabitsD); + + /*part 5: fill in all the out[n] values based on the length and dist*/ + start = (*pos); + backward = start - distance; + if((*pos) + length >= out->size) ucvector_resize(out, ((*pos) + length) * 2); /*reserve more room at once*/ + if((*pos) + length >= out->size) { error = 9914; break; } /*not enough memory*/ + + for(forward = 0; forward < length; forward++) + { + out->data[(*pos)] = out->data[backward]; + (*pos)++; + backward++; + if(backward >= start) backward = start - distance; + } + } + } + + HuffmanTree_cleanup(&codetree); + HuffmanTree_cleanup(&codetreeD); + + return error; +} + +static unsigned inflateNoCompression(ucvector* out, const unsigned char* in, size_t* bp, size_t* pos, size_t inlength) +{ + /*go to first boundary of byte*/ + size_t p; + unsigned LEN, NLEN, n, error = 0; + while(((*bp) & 0x7) != 0) (*bp)++; + p = (*bp) / 8; /*byte position*/ + + /*read LEN (2 bytes) and NLEN (2 bytes)*/ + if(p >= inlength - 4) return 52; /*error, bit pointer will jump past memory*/ + LEN = in[p] + 256 * in[p + 1]; p += 2; + NLEN = in[p] + 256 * in[p + 1]; p += 2; + + /*check if 16-bit NLEN is really the one's complement of LEN*/ + if(LEN + NLEN != 65535) return 21; /*error: NLEN is not one's complement of LEN*/ + + if((*pos) + LEN >= out->size) { if(!ucvector_resize(out, (*pos) + LEN)) return 9915; } + + /*read the literal data: LEN bytes are now stored in the out buffer*/ + if(p + LEN > inlength) return 23; /*error: reading outside of in buffer*/ + for(n = 0; n < LEN; n++) out->data[(*pos)++] = in[p++]; + + (*bp) = p * 8; + + return error; +} + +/*inflate the deflated data (cfr. deflate spec); return value is the error*/ +unsigned LodeFlate_inflate(ucvector* out, const unsigned char* in, size_t insize, size_t inpos) +{ + size_t bp = 0; /*bit pointer in the "in" data, current byte is bp >> 3, current bit is bp & 0x7 (from lsb to msb of the byte)*/ + unsigned BFINAL = 0; + size_t pos = 0; /*byte position in the out buffer*/ + + unsigned error = 0; + + while(!BFINAL) + { + unsigned BTYPE; + if((bp >> 3) >= insize) return 52; /*error, bit pointer will jump past memory*/ + BFINAL = readBitFromStream(&bp, &in[inpos]); + BTYPE = 1 * readBitFromStream(&bp, &in[inpos]); BTYPE += 2 * readBitFromStream(&bp, &in[inpos]); + + if(BTYPE == 3) return 20; /*error: invalid BTYPE*/ + else if(BTYPE == 0) error = inflateNoCompression(out, &in[inpos], &bp, &pos, insize); /*no compression*/ + else error = inflateHuffmanBlock(out, &in[inpos], &bp, &pos, insize, BTYPE); /*compression, BTYPE 01 or 10*/ + if(error) return error; + } + + if(!ucvector_resize(out, pos)) error = 9916; /*Only now we know the true size of out, resize it to that*/ + + return error; +} + +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Deflator / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +static const size_t MAX_SUPPORTED_DEFLATE_LENGTH = 258; + +/*bitlen is the size in bits of the code*/ +static void addHuffmanSymbol(size_t* bp, ucvector* compressed, unsigned code, unsigned bitlen) +{ + addBitsToStreamReversed(bp, compressed, code, bitlen); +} + +/*search the index in the array, that has the largest value smaller than or equal to the given value, given array must be sorted (if no value is smaller, it returns the size of the given array)*/ +static size_t searchCodeIndex(const unsigned* array, size_t array_size, size_t value) +{ + /*linear search implementation*/ + /*for(size_t i = 1; i < array_size; i++) if(array[i] > value) return i - 1; + return array_size - 1;*/ + + /*binary search implementation (not that much faster) (precondition: array_size > 0)*/ + size_t left = 1; + size_t right = array_size - 1; + while(left <= right) + { + size_t mid = (left + right) / 2; + if(array[mid] <= value) left = mid + 1; /*the value to find is more to the right*/ + else if(array[mid - 1] > value) right = mid - 1; /*the value to find is more to the left*/ + else return mid - 1; + } + return array_size - 1; +} + +static void addLengthDistance(uivector* values, size_t length, size_t distance) +{ + /*values in encoded vector are those used by deflate: + 0-255: literal bytes + 256: end + 257-285: length/distance pair (length code, followed by extra length bits, distance code, extra distance bits) + 286-287: invalid*/ + + unsigned length_code = (unsigned)searchCodeIndex(LENGTHBASE, 29, length); + unsigned extra_length = (unsigned)(length - LENGTHBASE[length_code]); + unsigned dist_code = (unsigned)searchCodeIndex(DISTANCEBASE, 30, distance); + unsigned extra_distance = (unsigned)(distance - DISTANCEBASE[dist_code]); + + uivector_push_back(values, length_code + FIRST_LENGTH_CODE_INDEX); + uivector_push_back(values, extra_length); + uivector_push_back(values, dist_code); + uivector_push_back(values, extra_distance); +} + +#if 0 +/*the "brute force" version of the encodeLZ7 algorithm, not used anymore, kept here for reference*/ +static void encodeLZ77_brute(uivector* out, const unsigned char* in, size_t size, unsigned windowSize) +{ + size_t pos; + /*using pointer instead of vector for input makes it faster when NOT using optimization when compiling; no influence if optimization is used*/ + for(pos = 0; pos < size; pos++) + { + size_t length = 0, offset = 0; /*the length and offset found for the current position*/ + size_t max_offset = pos < windowSize ? pos : windowSize; /*how far back to test*/ + size_t current_offset; + + /**search for the longest string**/ + for(current_offset = 1; current_offset < max_offset; current_offset++) /*search backwards through all possible distances (=offsets)*/ + { + size_t backpos = pos - current_offset; + if(in[backpos] == in[pos]) + { + /*test the next characters*/ + size_t current_length = 1; + size_t backtest = backpos + 1; + size_t foretest = pos + 1; + while(foretest < size && in[backtest] == in[foretest] && current_length < MAX_SUPPORTED_DEFLATE_LENGTH) /*maximum supporte length by deflate is max length*/ + { + if(backpos >= pos) backpos -= current_offset; /*continue as if we work on the decoded bytes after pos by jumping back before pos*/ + current_length++; + backtest++; + foretest++; + } + if(current_length > length) + { + length = current_length; /*the longest length*/ + offset = current_offset; /*the offset that is related to this longest length*/ + if(current_length == MAX_SUPPORTED_DEFLATE_LENGTH) break; /*you can jump out of this for loop once a length of max length is found (gives significant speed gain)*/ + } + } + } + + /**encode it as length/distance pair or literal value**/ + if(length < 3) /*only lengths of 3 or higher are supported as length/distance pair*/ + { + uivector_push_back(out, in[pos]); + } + else + { + addLengthDistance(out, length, offset); + pos += (length - 1); + } + } /*end of the loop through each character of input*/ +} +#endif + +static const unsigned HASH_NUM_VALUES = 65536; +static const unsigned HASH_NUM_CHARACTERS = 6; +static const unsigned HASH_SHIFT = 2; +/* +Good and fast values: HASH_NUM_VALUES=65536, HASH_NUM_CHARACTERS=6, HASH_SHIFT=2 +making HASH_NUM_CHARACTERS larger (like 8), makes the file size larger but is a bit faster +making HASH_NUM_CHARACTERS smaller (like 3), makes the file size smaller but is slower +*/ + +static unsigned getHash(const unsigned char* data, size_t size, size_t pos) +{ + unsigned result = 0; + size_t amount, i; + if(pos >= size) return 0; + amount = HASH_NUM_CHARACTERS; if(pos + amount >= size) amount = size - pos; + for(i = 0; i < amount; i++) result ^= (data[pos + i] << (i * HASH_SHIFT)); + return result % HASH_NUM_VALUES; +} + +/*LZ77-encode the data using a hash table technique to let it encode faster. Return value is error code*/ +static unsigned encodeLZ77(uivector* out, const unsigned char* in, size_t size, unsigned windowSize) +{ + /**generate hash table**/ + vector table; /*HASH_NUM_VALUES uivectors; this represents what would be an std::vector<std::vector<unsigned> > in C++*/ + uivector tablepos1, tablepos2; + unsigned pos, i, error = 0; + + vector_init(&table, sizeof(uivector)); + if(!vector_resize(&table, HASH_NUM_VALUES)) return 9917; + for(i = 0; i < HASH_NUM_VALUES; i++) + { + uivector* v = (uivector*)vector_get(&table, i); + uivector_init(v); + } + + /*remember start and end positions in the tables to searching in*/ + uivector_init(&tablepos1); + uivector_init(&tablepos2); + if(!uivector_resizev(&tablepos1, HASH_NUM_VALUES, 0)) error = 9918; + if(!uivector_resizev(&tablepos2, HASH_NUM_VALUES, 0)) error = 9919; + + if(!error) + { + for(pos = 0; pos < size; pos++) + { + unsigned length = 0, offset = 0; /*the length and offset found for the current position*/ + unsigned max_offset = pos < windowSize ? pos : windowSize; /*how far back to test*/ + unsigned tablepos; + + /*/search for the longest string*/ + /*first find out where in the table to start (the first value that is in the range from "pos - max_offset" to "pos")*/ + unsigned hash = getHash(in, size, pos); + if(!uivector_push_back((uivector*)vector_get(&table, hash), pos)) { error = 9920; break; } + + while(((uivector*)vector_get(&table, hash))->data[tablepos1.data[hash]] < pos - max_offset) tablepos1.data[hash]++; /*it now points to the first value in the table for which the index is larger than or equal to pos - max_offset*/ + while(((uivector*)vector_get(&table, hash))->data[tablepos2.data[hash]] < pos) tablepos2.data[hash]++; /*it now points to the first value in the table for which the index is larger than or equal to pos*/ + + for(tablepos = tablepos2.data[hash] - 1; tablepos >= tablepos1.data[hash] && tablepos < tablepos2.data[hash]; tablepos--) + { + unsigned backpos = ((uivector*)vector_get(&table, hash))->data[tablepos]; + unsigned current_offset = pos - backpos; + + /*test the next characters*/ + unsigned current_length = 0; + unsigned backtest = backpos; + unsigned foretest = pos; + while(foretest < size && in[backtest] == in[foretest] && current_length < MAX_SUPPORTED_DEFLATE_LENGTH) /*maximum supporte length by deflate is max length*/ + { + if(backpos >= pos) backpos -= current_offset; /*continue as if we work on the decoded bytes after pos by jumping back before pos*/ + current_length++; + backtest++; + foretest++; + } + if(current_length > length) + { + length = current_length; /*the longest length*/ + offset = current_offset; /*the offset that is related to this longest length*/ + if(current_length == MAX_SUPPORTED_DEFLATE_LENGTH) break; /*you can jump out of this for loop once a length of max length is found (gives significant speed gain)*/ + } + } + + /**encode it as length/distance pair or literal value**/ + if(length < 3) /*only lengths of 3 or higher are supported as length/distance pair*/ + { + if(!uivector_push_back(out, in[pos])) { error = 9921; break; } + } + else + { + unsigned j; + addLengthDistance(out, length, offset); + for(j = 0; j < length - 1; j++) + { + pos++; + if(!uivector_push_back((uivector*)vector_get(&table, getHash(in, size, pos)), pos)) { error = 9922; break; } + } + } + } /*end of the loop through each character of input*/ + } /*end of "if(!error)"*/ + + /*cleanup*/ + for(i = 0; i < table.size; i++) + { + uivector* v = (uivector*)vector_get(&table, i); + uivector_cleanup(v); + } + vector_cleanup(&table); + uivector_cleanup(&tablepos1); + uivector_cleanup(&tablepos2); + return error; +} + +/* /////////////////////////////////////////////////////////////////////////// */ + +static unsigned deflateNoCompression(ucvector* out, const unsigned char* data, size_t datasize) +{ + /*non compressed deflate block data: 1 bit BFINAL,2 bits BTYPE,(5 bits): it jumps to start of next byte, 2 bytes LEN, 2 bytes NLEN, LEN bytes literal DATA*/ + + size_t i, j, numdeflateblocks = datasize / 65536 + 1; + unsigned datapos = 0; + for(i = 0; i < numdeflateblocks; i++) + { + unsigned BFINAL, BTYPE, LEN, NLEN; + unsigned char firstbyte; + + BFINAL = (i == numdeflateblocks - 1); + BTYPE = 0; + + firstbyte = (unsigned char)(BFINAL + ((BTYPE & 1) << 1) + ((BTYPE & 2) << 1)); + ucvector_push_back(out, firstbyte); + + LEN = 65535; + if(datasize - datapos < 65535) LEN = (unsigned)datasize - datapos; + NLEN = 65535 - LEN; + + ucvector_push_back(out, (unsigned char)(LEN % 256)); + ucvector_push_back(out, (unsigned char)(LEN / 256)); + ucvector_push_back(out, (unsigned char)(NLEN % 256)); + ucvector_push_back(out, (unsigned char)(NLEN / 256)); + + /*Decompressed data*/ + for(j = 0; j < 65535 && datapos < datasize; j++) + { + ucvector_push_back(out, data[datapos++]); + } + } + + return 0; +} + +/*write the encoded data, using lit/len as well as distance codes*/ +static void writeLZ77data(size_t* bp, ucvector* out, const uivector* lz77_encoded, const HuffmanTree* codes, const HuffmanTree* codesD) +{ + size_t i = 0; + for(i = 0; i < lz77_encoded->size; i++) + { + unsigned val = lz77_encoded->data[i]; + addHuffmanSymbol(bp, out, HuffmanTree_getCode(codes, val), HuffmanTree_getLength(codes, val)); + if(val > 256) /*for a length code, 3 more things have to be added*/ + { + unsigned length_index = val - FIRST_LENGTH_CODE_INDEX; + unsigned n_length_extra_bits = LENGTHEXTRA[length_index]; + unsigned length_extra_bits = lz77_encoded->data[++i]; + + unsigned distance_code = lz77_encoded->data[++i]; + + unsigned distance_index = distance_code; + unsigned n_distance_extra_bits = DISTANCEEXTRA[distance_index]; + unsigned distance_extra_bits = lz77_encoded->data[++i]; + + addBitsToStream(bp, out, length_extra_bits, n_length_extra_bits); + addHuffmanSymbol(bp, out, HuffmanTree_getCode(codesD, distance_code), HuffmanTree_getLength(codesD, distance_code)); + addBitsToStream(bp, out, distance_extra_bits, n_distance_extra_bits); + } + } +} + +static unsigned deflateDynamic(ucvector* out, const unsigned char* data, size_t datasize, const LodeZlib_DeflateSettings* settings) +{ + /* + after the BFINAL and BTYPE, the dynamic block consists out of the following: + - 5 bits HLIT, 5 bits HDIST, 4 bits HCLEN + - (HCLEN+4)*3 bits code lengths of code length alphabet + - HLIT + 257 code lenghts of lit/length alphabet (encoded using the code length alphabet, + possible repetition codes 16, 17, 18) + - HDIST + 1 code lengths of distance alphabet (encoded using the code length alphabet, + possible repetition codes 16, 17, 18) + - compressed data + - 256 (end code) + */ + + unsigned error = 0; + + uivector lz77_encoded; + HuffmanTree codes; /*tree for literal values and length codes*/ + HuffmanTree codesD; /*tree for distance codes*/ + HuffmanTree codelengthcodes; + uivector frequencies; + uivector frequenciesD; + uivector amounts; /*the amounts in the "normal" order*/ + uivector lldl; + uivector lldll; /*lit/len & dist code lenghts*/ + uivector clcls; + + unsigned BFINAL = 1; /*make only one block... the first and final one*/ + size_t numcodes, numcodesD, i, bp = 0; /*the bit pointer*/ + unsigned HLIT, HDIST, HCLEN; + + uivector_init(&lz77_encoded); + HuffmanTree_init(&codes); + HuffmanTree_init(&codesD); + HuffmanTree_init(&codelengthcodes); + uivector_init(&frequencies); + uivector_init(&frequenciesD); + uivector_init(&amounts); + uivector_init(&lldl); + uivector_init(&lldll); + uivector_init(&clcls); + + while(!error) /*the goto-avoiding while construct: break out to go to the cleanup phase, a break at the end makes sure the while is never repeated*/ + { + if(settings->useLZ77) + { + error = encodeLZ77(&lz77_encoded, data, datasize, settings->windowSize); /*LZ77 encoded*/ + if(error) break; + } + else + { + if(!uivector_resize(&lz77_encoded, datasize)) { error = 9923; break; } + for(i = 0; i < datasize; i++) lz77_encoded.data[i] = data[i]; /*no LZ77, but still will be Huffman compressed*/ + } + + if(!uivector_resizev(&frequencies, 286, 0)) { error = 9924; break; } + if(!uivector_resizev(&frequenciesD, 30, 0)) { error = 9925; break; } + for(i = 0; i < lz77_encoded.size; i++) + { + unsigned symbol = lz77_encoded.data[i]; + frequencies.data[symbol]++; + if(symbol > 256) + { + unsigned dist = lz77_encoded.data[i + 2]; + frequenciesD.data[dist]++; + i += 3; + } + } + frequencies.data[256] = 1; /*there will be exactly 1 end code, at the end of the block*/ + + error = HuffmanTree_makeFromFrequencies(&codes, frequencies.data, frequencies.size, 15); + if(error) break; + error = HuffmanTree_makeFromFrequencies(&codesD, frequenciesD.data, frequenciesD.size, 15); + if(error) break; + + addBitToStream(&bp, out, BFINAL); + addBitToStream(&bp, out, 0); /*first bit of BTYPE "dynamic"*/ + addBitToStream(&bp, out, 1); /*second bit of BTYPE "dynamic"*/ + + numcodes = codes.numcodes; if(numcodes > 286) numcodes = 286; + numcodesD = codesD.numcodes; if(numcodesD > 30) numcodesD = 30; + for(i = 0; i < numcodes; i++) uivector_push_back(&lldll, HuffmanTree_getLength(&codes, (unsigned)i)); + for(i = 0; i < numcodesD; i++) uivector_push_back(&lldll, HuffmanTree_getLength(&codesD, (unsigned)i)); + + /*make lldl smaller by using repeat codes 16 (copy length 3-6 times), 17 (3-10 zeroes), 18 (11-138 zeroes)*/ + for(i = 0; i < (unsigned)lldll.size; i++) + { + unsigned j = 0; + while(i + j + 1 < (unsigned)lldll.size && lldll.data[i + j + 1] == lldll.data[i]) j++; + + if(lldll.data[i] == 0 && j >= 2) + { + j++; /*include the first zero*/ + if(j <= 10) { uivector_push_back(&lldl, 17); uivector_push_back(&lldl, j - 3); } + else + { + if(j > 138) j = 138; + uivector_push_back(&lldl, 18); uivector_push_back(&lldl, j - 11); + } + i += (j - 1); + } + else if(j >= 3) + { + size_t k; + unsigned num = j / 6, rest = j % 6; + uivector_push_back(&lldl, lldll.data[i]); + for(k = 0; k < num; k++) { uivector_push_back(&lldl, 16); uivector_push_back(&lldl, 6 - 3); } + if(rest >= 3) { uivector_push_back(&lldl, 16); uivector_push_back(&lldl, rest - 3); } + else j -= rest; + i += j; + } + else uivector_push_back(&lldl, lldll.data[i]); + } + + /*generate huffmantree for the length codes of lit/len and dist codes*/ + if(!uivector_resizev(&amounts, 19, 0)) { error = 9926; break; } /*16 possible lengths (0-15) and 3 repeat codes (16, 17 and 18)*/ + for(i = 0; i < lldl.size; i++) + { + amounts.data[lldl.data[i]]++; + if(lldl.data[i] >= 16) i++; /*after a repeat code come the bits that specify the amount, those don't need to be in the amounts calculation*/ + } + + error = HuffmanTree_makeFromFrequencies(&codelengthcodes, amounts.data, amounts.size, 7); + if(error) break; + + if(!uivector_resize(&clcls, 19)) { error = 9927; break; } + for(i = 0; i < 19; i++) clcls.data[i] = HuffmanTree_getLength(&codelengthcodes, CLCL[i]); /*lenghts of code length tree is in the order as specified by deflate*/ + while(clcls.data[clcls.size - 1] == 0 && clcls.size > 4) + { + if(!uivector_resize(&clcls, clcls.size - 1)) { error = 9928; break; } /*remove zeros at the end, but minimum size must be 4*/ + } + if(error) break; + + /*write the HLIT, HDIST and HCLEN values*/ + HLIT = (unsigned)(numcodes - 257); + HDIST = (unsigned)(numcodesD - 1); + HCLEN = (unsigned)clcls.size - 4; + addBitsToStream(&bp, out, HLIT, 5); + addBitsToStream(&bp, out, HDIST, 5); + addBitsToStream(&bp, out, HCLEN, 4); + + /*write the code lenghts of the code length alphabet*/ + for(i = 0; i < HCLEN + 4; i++) addBitsToStream(&bp, out, clcls.data[i], 3); + + /*write the lenghts of the lit/len AND the dist alphabet*/ + for(i = 0; i < lldl.size; i++) + { + addHuffmanSymbol(&bp, out, HuffmanTree_getCode(&codelengthcodes, lldl.data[i]), HuffmanTree_getLength(&codelengthcodes, lldl.data[i])); + /*extra bits of repeat codes*/ + if(lldl.data[i] == 16) addBitsToStream(&bp, out, lldl.data[++i], 2); + else if(lldl.data[i] == 17) addBitsToStream(&bp, out, lldl.data[++i], 3); + else if(lldl.data[i] == 18) addBitsToStream(&bp, out, lldl.data[++i], 7); + } + + /*write the compressed data symbols*/ + writeLZ77data(&bp, out, &lz77_encoded, &codes, &codesD); + if(HuffmanTree_getLength(&codes, 256) == 0) { error = 64; break; } /*the length of the end code 256 must be larger than 0*/ + addHuffmanSymbol(&bp, out, HuffmanTree_getCode(&codes, 256), HuffmanTree_getLength(&codes, 256)); /*end code*/ + + break; /*end of error-while*/ + } + + /*cleanup*/ + uivector_cleanup(&lz77_encoded); + HuffmanTree_cleanup(&codes); + HuffmanTree_cleanup(&codesD); + HuffmanTree_cleanup(&codelengthcodes); + uivector_cleanup(&frequencies); + uivector_cleanup(&frequenciesD); + uivector_cleanup(&amounts); + uivector_cleanup(&lldl); + uivector_cleanup(&lldll); + uivector_cleanup(&clcls); + + return error; +} + +static unsigned deflateFixed(ucvector* out, const unsigned char* data, size_t datasize, const LodeZlib_DeflateSettings* settings) +{ + HuffmanTree codes; /*tree for literal values and length codes*/ + HuffmanTree codesD; /*tree for distance codes*/ + + unsigned BFINAL = 1; /*make only one block... the first and final one*/ + unsigned error = 0; + size_t i, bp = 0; /*the bit pointer*/ + + HuffmanTree_init(&codes); + HuffmanTree_init(&codesD); + + generateFixedTree(&codes); + generateDistanceTree(&codesD); + + addBitToStream(&bp, out, BFINAL); + addBitToStream(&bp, out, 1); /*first bit of BTYPE*/ + addBitToStream(&bp, out, 0); /*second bit of BTYPE*/ + + if(settings->useLZ77) /*LZ77 encoded*/ + { + uivector lz77_encoded; + uivector_init(&lz77_encoded); + error = encodeLZ77(&lz77_encoded, data, datasize, settings->windowSize); + if(!error) writeLZ77data(&bp, out, &lz77_encoded, &codes, &codesD); + uivector_cleanup(&lz77_encoded); + } + else /*no LZ77, but still will be Huffman compressed*/ + { + for(i = 0; i < datasize; i++) addHuffmanSymbol(&bp, out, HuffmanTree_getCode(&codes, data[i]), HuffmanTree_getLength(&codes, data[i])); + } + if(!error) addHuffmanSymbol(&bp, out, HuffmanTree_getCode(&codes, 256), HuffmanTree_getLength(&codes, 256)); /*"end" code*/ + + /*cleanup*/ + HuffmanTree_cleanup(&codes); + HuffmanTree_cleanup(&codesD); + + return error; +} + +unsigned LodeFlate_deflate(ucvector* out, const unsigned char* data, size_t datasize, const LodeZlib_DeflateSettings* settings) +{ + unsigned error = 0; + if(settings->btype == 0) error = deflateNoCompression(out, data, datasize); + else if(settings->btype == 1) error = deflateFixed(out, data, datasize, settings); + else if(settings->btype == 2) error = deflateDynamic(out, data, datasize, settings); + else error = 61; + return error; +} + +#endif /*LODEPNG_COMPILE_DECODER*/ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Adler32 */ +/* ////////////////////////////////////////////////////////////////////////// */ + +static unsigned update_adler32(unsigned adler, const unsigned char* data, unsigned len) +{ + unsigned s1 = adler & 0xffff; + unsigned s2 = (adler >> 16) & 0xffff; + + while(len > 0) + { + /*at least 5550 sums can be done before the sums overflow, saving us from a lot of module divisions*/ + unsigned amount = len > 5550 ? 5550 : len; + len -= amount; + while(amount > 0) + { + s1 = (s1 + *data++); + s2 = (s2 + s1); + amount--; + } + s1 %= 65521; + s2 %= 65521; + } + + return (s2 << 16) | s1; +} + +/*Return the adler32 of the bytes data[0..len-1]*/ +static unsigned adler32(const unsigned char* data, unsigned len) +{ + return update_adler32(1L, data, len); +} + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Reading and writing single bits and bytes from/to stream for Zlib / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_ENCODER +void LodeZlib_add32bitInt(ucvector* buffer, unsigned value) +{ + ucvector_push_back(buffer, (unsigned char)((value >> 24) & 0xff)); + ucvector_push_back(buffer, (unsigned char)((value >> 16) & 0xff)); + ucvector_push_back(buffer, (unsigned char)((value >> 8) & 0xff)); + ucvector_push_back(buffer, (unsigned char)((value ) & 0xff)); +} +#endif /*LODEPNG_COMPILE_ENCODER*/ + +unsigned LodeZlib_read32bitInt(const unsigned char* buffer) +{ + return (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]; +} + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Zlib / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_DECODER + +unsigned LodeZlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, const LodeZlib_DecompressSettings* settings) +{ + unsigned error = 0; + unsigned CM, CINFO, FDICT; + ucvector outv; + + if(insize < 2) { error = 53; return error; } /*error, size of zlib data too small*/ + /*read information from zlib header*/ + if((in[0] * 256 + in[1]) % 31 != 0) { error = 24; return error; } /*error: 256 * in[0] + in[1] must be a multiple of 31, the FCHECK value is supposed to be made that way*/ + + CM = in[0] & 15; + CINFO = (in[0] >> 4) & 15; + /*FCHECK = in[1] & 31; //FCHECK is already tested above*/ + FDICT = (in[1] >> 5) & 1; + /*FLEVEL = (in[1] >> 6) & 3; //not really important, all it does it to give a compiler warning about unused variable, we don't care what encoding setting the encoder used*/ + + if(CM != 8 || CINFO > 7) { error = 25; return error; } /*error: only compression method 8: inflate with sliding window of 32k is supported by the PNG spec*/ + if(FDICT != 0) { error = 26; return error; } /*error: the specification of PNG says about the zlib stream: "The additional flags shall not specify a preset dictionary."*/ + + ucvector_init_buffer(&outv, *out, *outsize); /*ucvector-controlled version of the output buffer, for dynamic array*/ + error = LodeFlate_inflate(&outv, in, insize, 2); + *out = outv.data; + *outsize = outv.size; + if(error) return error; + + if(!settings->ignoreAdler32) + { + unsigned ADLER32 = LodeZlib_read32bitInt(&in[insize - 4]); + unsigned checksum = adler32(outv.data, (unsigned)outv.size); + if(checksum != ADLER32) { error = 58; return error; } + } + + return error; +} + +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER + +unsigned LodeZlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, const LodeZlib_DeflateSettings* settings) +{ + /*initially, *out must be NULL and outsize 0, if you just give some random *out that's pointing to a non allocated buffer, this'll crash*/ + ucvector deflatedata, outv; + size_t i; + unsigned error; + + unsigned ADLER32; + /*zlib data: 1 byte CMF (CM+CINFO), 1 byte FLG, deflate data, 4 byte ADLER32 checksum of the Decompressed data*/ + unsigned CMF = 120; /*0b01111000: CM 8, CINFO 7. With CINFO 7, any window size up to 32768 can be used.*/ + unsigned FLEVEL = 0; + unsigned FDICT = 0; + unsigned CMFFLG = 256 * CMF + FDICT * 32 + FLEVEL * 64; + unsigned FCHECK = 31 - CMFFLG % 31; + CMFFLG += FCHECK; + + ucvector_init_buffer(&outv, *out, *outsize); /*ucvector-controlled version of the output buffer, for dynamic array*/ + + ucvector_push_back(&outv, (unsigned char)(CMFFLG / 256)); + ucvector_push_back(&outv, (unsigned char)(CMFFLG % 256)); + + ucvector_init(&deflatedata); + error = LodeFlate_deflate(&deflatedata, in, insize, settings); + + if(!error) + { + ADLER32 = adler32(in, (unsigned)insize); + for(i = 0; i < deflatedata.size; i++) ucvector_push_back(&outv, deflatedata.data[i]); + ucvector_cleanup(&deflatedata); + LodeZlib_add32bitInt(&outv, ADLER32); + } + + *out = outv.data; + *outsize = outv.size; + + return error; +} + +#endif /*LODEPNG_COMPILE_ENCODER*/ + +#endif /*LODEPNG_COMPILE_ZLIB*/ + +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_ENCODER + +void LodeZlib_DeflateSettings_init(LodeZlib_DeflateSettings* settings) +{ + settings->btype = 2; /*compress with dynamic huffman tree (not in the mathematical sense, just not the predefined one)*/ + settings->useLZ77 = 1; + settings->windowSize = 2048; /*this is a good tradeoff between speed and compression ratio*/ +} + +const LodeZlib_DeflateSettings LodeZlib_defaultDeflateSettings = {2, 1, 2048}; + +#endif /*LODEPNG_COMPILE_ENCODER*/ + +#ifdef LODEPNG_COMPILE_DECODER + +void LodeZlib_DecompressSettings_init(LodeZlib_DecompressSettings* settings) +{ + settings->ignoreAdler32 = 0; +} + +const LodeZlib_DecompressSettings LodeZlib_defaultDecompressSettings = {0}; + +#endif /*LODEPNG_COMPILE_DECODER*/ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* // End of Zlib related code, now comes the PNG related code that uses it// */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_PNG + +/* +The two functions below (LodePNG_decompress and LodePNG_compress) directly call the +LodeZlib_decompress and LodeZlib_compress functions. The only purpose of the functions +below, is to provide the ability to let LodePNG use a different Zlib encoder by only +changing the two functions below, instead of changing it inside the vareous places +in the other LodePNG functions. + +*out must be NULL and *outsize must be 0 initially, and after the function is done, +*out must point to the decompressed data, *outsize must be the size of it, and must +be the size of the useful data in bytes, not the alloc size. +*/ + +#ifdef LODEPNG_COMPILE_DECODER +static unsigned LodePNG_decompress(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, const LodeZlib_DecompressSettings* settings) +{ + return LodeZlib_decompress(out, outsize, in, insize, settings); +} +#endif /*LODEPNG_COMPILE_DECODER*/ +#ifdef LODEPNG_COMPILE_ENCODER +static unsigned LodePNG_compress(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, const LodeZlib_DeflateSettings* settings) +{ + return LodeZlib_compress(out, outsize, in, insize, settings); +} +#endif /*LODEPNG_COMPILE_ENCODER*/ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / CRC32 / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +static unsigned Crc32_crc_table_computed = 0; +static unsigned Crc32_crc_table[256]; + +/*Make the table for a fast CRC.*/ +static void Crc32_make_crc_table(void) +{ + unsigned c, k, n; + for(n = 0; n < 256; n++) + { + c = n; + for(k = 0; k < 8; k++) + { + if(c & 1) c = 0xedb88320L ^ (c >> 1); + else c = c >> 1; + } + Crc32_crc_table[n] = c; + } + Crc32_crc_table_computed = 1; +} + +/*Update a running CRC with the bytes buf[0..len-1]--the CRC should be +initialized to all 1's, and the transmitted value is the 1's complement of the +final running CRC (see the crc() routine below).*/ +static unsigned Crc32_update_crc(const unsigned char* buf, unsigned crc, size_t len) +{ + unsigned c = crc; + size_t n; + + if(!Crc32_crc_table_computed) Crc32_make_crc_table(); + for(n = 0; n < len; n++) + { + c = Crc32_crc_table[(c ^ buf[n]) & 0xff] ^ (c >> 8); + } + return c; +} + +/*Return the CRC of the bytes buf[0..len-1].*/ +static unsigned Crc32_crc(const unsigned char* buf, size_t len) +{ + return Crc32_update_crc(buf, 0xffffffffL, len) ^ 0xffffffffL; +} + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Reading and writing single bits and bytes from/to stream for LodePNG / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +static unsigned char readBitFromReversedStream(size_t* bitpointer, const unsigned char* bitstream) +{ + unsigned char result = (unsigned char)((bitstream[(*bitpointer) >> 3] >> (7 - ((*bitpointer) & 0x7))) & 1); + (*bitpointer)++; + return result; +} + +static unsigned readBitsFromReversedStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits) +{ + unsigned result = 0; + size_t i; + for(i = nbits - 1; i < nbits; i--) result += (unsigned)readBitFromReversedStream(bitpointer, bitstream) << i; + return result; +} + +#ifdef LODEPNG_COMPILE_DECODER +static void setBitOfReversedStream0(size_t* bitpointer, unsigned char* bitstream, unsigned char bit) +{ + /*the current bit in bitstream must be 0 for this to work*/ + if(bit) bitstream[(*bitpointer) >> 3] |= (bit << (7 - ((*bitpointer) & 0x7))); /*earlier bit of huffman code is in a lesser significant bit of an earlier byte*/ + (*bitpointer)++; +} +#endif /*LODEPNG_COMPILE_DECODER*/ + +static void setBitOfReversedStream(size_t* bitpointer, unsigned char* bitstream, unsigned char bit) +{ + /*the current bit in bitstream may be 0 or 1 for this to work*/ + if(bit == 0) bitstream[(*bitpointer) >> 3] &= (unsigned char)(~(1 << (7 - ((*bitpointer) & 0x7)))); + else bitstream[(*bitpointer) >> 3] |= (1 << (7 - ((*bitpointer) & 0x7))); + (*bitpointer)++; +} + +static unsigned LodePNG_read32bitInt(const unsigned char* buffer) +{ + return (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]; +} + +static void LodePNG_set32bitInt(unsigned char* buffer, unsigned value) /*buffer must have at least 4 allocated bytes available*/ +{ + buffer[0] = (unsigned char)((value >> 24) & 0xff); + buffer[1] = (unsigned char)((value >> 16) & 0xff); + buffer[2] = (unsigned char)((value >> 8) & 0xff); + buffer[3] = (unsigned char)((value ) & 0xff); +} + +#ifdef LODEPNG_COMPILE_ENCODER +static void LodePNG_add32bitInt(ucvector* buffer, unsigned value) +{ + ucvector_resize(buffer, buffer->size + 4); + LodePNG_set32bitInt(&buffer->data[buffer->size - 4], value); +} +#endif /*LODEPNG_COMPILE_ENCODER*/ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / PNG chunks / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +unsigned LodePNG_chunk_length(const unsigned char* chunk) /*get the length of the data of the chunk. Total chunk length has 12 bytes more.*/ +{ + return LodePNG_read32bitInt(&chunk[0]); +} + +void LodePNG_chunk_type(char type[5], const unsigned char* chunk) /*puts the 4-byte type in null terminated string*/ +{ + unsigned i; + for(i = 0; i < 4; i++) type[i] = chunk[4 + i]; + type[4] = 0; /*null termination char*/ +} + +unsigned char LodePNG_chunk_type_equals(const unsigned char* chunk, const char* type) /*check if the type is the given type*/ +{ + if(strlen(type) != 4) return 0; + return (chunk[4] == type[0] && chunk[5] == type[1] && chunk[6] == type[2] && chunk[7] == type[3]); +} + +/*properties of PNG chunks gotten from capitalization of chunk type name, as defined by the standard*/ +unsigned char LodePNG_chunk_critical(const unsigned char* chunk) /*0: ancillary chunk, 1: it's one of the critical chunk types*/ +{ + return((chunk[4] & 32) == 0); +} + +unsigned char LodePNG_chunk_private(const unsigned char* chunk) /*0: public, 1: private*/ +{ + return((chunk[6] & 32) != 0); +} + +unsigned char LodePNG_chunk_safetocopy(const unsigned char* chunk) /*0: the chunk is unsafe to copy, 1: the chunk is safe to copy*/ +{ + return((chunk[7] & 32) != 0); +} + +unsigned char* LodePNG_chunk_data(unsigned char* chunk) /*get pointer to the data of the chunk*/ +{ + return &chunk[8]; +} + +const unsigned char* LodePNG_chunk_data_const(const unsigned char* chunk) /*get pointer to the data of the chunk*/ +{ + return &chunk[8]; +} + +unsigned LodePNG_chunk_check_crc(const unsigned char* chunk) /*returns 0 if the crc is correct, error code if it's incorrect*/ +{ + unsigned length = LodePNG_chunk_length(chunk); + unsigned CRC = LodePNG_read32bitInt(&chunk[length + 8]); + unsigned checksum = Crc32_crc(&chunk[4], length + 4); /*the CRC is taken of the data and the 4 chunk type letters, not the length*/ + if(CRC != checksum) return 1; + else return 0; +} + +void LodePNG_chunk_generate_crc(unsigned char* chunk) /*generates the correct CRC from the data and puts it in the last 4 bytes of the chunk*/ +{ + unsigned length = LodePNG_chunk_length(chunk); + unsigned CRC = Crc32_crc(&chunk[4], length + 4); + LodePNG_set32bitInt(chunk + 8 + length, CRC); +} + +unsigned char* LodePNG_chunk_next(unsigned char* chunk) /*don't use on IEND chunk, as there is no next chunk then*/ +{ + unsigned total_chunk_length = LodePNG_chunk_length(chunk) + 12; + return &chunk[total_chunk_length]; +} + +const unsigned char* LodePNG_chunk_next_const(const unsigned char* chunk) /*don't use on IEND chunk, as there is no next chunk then*/ +{ + unsigned total_chunk_length = LodePNG_chunk_length(chunk) + 12; + return &chunk[total_chunk_length]; +} + +unsigned LodePNG_append_chunk(unsigned char** out, size_t* outlength, const unsigned char* chunk) /*appends chunk that was already created, to the data. Returns error code.*/ +{ + unsigned i; + unsigned total_chunk_length = LodePNG_chunk_length(chunk) + 12; + unsigned char *chunk_start, *new_buffer; + size_t new_length = (*outlength) + total_chunk_length; + if(new_length < total_chunk_length || new_length < (*outlength)) return 77; /*integer overflow happened*/ + + new_buffer = (unsigned char*)realloc(*out, new_length); + if(!new_buffer) return 9929; + (*out) = new_buffer; + (*outlength) = new_length; + chunk_start = &(*out)[new_length - total_chunk_length]; + + for(i = 0; i < total_chunk_length; i++) chunk_start[i] = chunk[i]; + + return 0; +} + +unsigned LodePNG_create_chunk(unsigned char** out, size_t* outlength, unsigned length, const char* type, const unsigned char* data) /*appends new chunk to out. Returns error code; may change memory address of out buffer*/ +{ + unsigned i; + unsigned char *chunk, *new_buffer; + size_t new_length = (*outlength) + length + 12; + if(new_length < length + 12 || new_length < (*outlength)) return 77; /*integer overflow happened*/ + new_buffer = (unsigned char*)realloc(*out, new_length); + if(!new_buffer) return 9930; + (*out) = new_buffer; + (*outlength) = new_length; + chunk = &(*out)[(*outlength) - length - 12]; + + /*1: length*/ + LodePNG_set32bitInt(chunk, (unsigned)length); + + /*2: chunk name (4 letters)*/ + chunk[4] = type[0]; + chunk[5] = type[1]; + chunk[6] = type[2]; + chunk[7] = type[3]; + + /*3: the data*/ + for(i = 0; i < length; i++) chunk[8 + i] = data[i]; + + /*4: CRC (of the chunkname characters and the data)*/ + LodePNG_chunk_generate_crc(chunk); + + return 0; +} + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Color types and such / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +/*return type is a LodePNG error code*/ +static unsigned checkColorValidity(unsigned colorType, unsigned bd) /*bd = bitDepth*/ +{ + switch(colorType) + { + case 0: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16)) return 37; break; /*grey*/ + case 2: if(!( bd == 8 || bd == 16)) return 37; break; /*RGB*/ + case 3: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 )) return 37; break; /*palette*/ + case 4: if(!( bd == 8 || bd == 16)) return 37; break; /*grey + alpha*/ + case 6: if(!( bd == 8 || bd == 16)) return 37; break; /*RGBA*/ + default: return 31; + } + return 0; /*allowed color type / bits combination*/ +} + +static unsigned getNumColorChannels(unsigned colorType) +{ + switch(colorType) + { + case 0: return 1; /*grey*/ + case 2: return 3; /*RGB*/ + case 3: return 1; /*palette*/ + case 4: return 2; /*grey + alpha*/ + case 6: return 4; /*RGBA*/ + } + return 0; /*unexisting color type*/ +} + +static unsigned getBpp(unsigned colorType, unsigned bitDepth) +{ + return getNumColorChannels(colorType) * bitDepth; /*bits per pixel is amount of channels * bits per channel*/ +} + +/* ////////////////////////////////////////////////////////////////////////// */ + +void LodePNG_InfoColor_init(LodePNG_InfoColor* info) +{ + info->key_defined = 0; + info->key_r = info->key_g = info->key_b = 0; + info->colorType = 6; + info->bitDepth = 8; + info->palette = 0; + info->palettesize = 0; +} + +void LodePNG_InfoColor_cleanup(LodePNG_InfoColor* info) +{ + LodePNG_InfoColor_clearPalette(info); +} + +void LodePNG_InfoColor_clearPalette(LodePNG_InfoColor* info) +{ + if(info->palette) free(info->palette); + info->palettesize = 0; +} + +unsigned LodePNG_InfoColor_addPalette(LodePNG_InfoColor* info, unsigned char r, unsigned char g, unsigned char b, unsigned char a) +{ + unsigned char* data; + /*the same resize technique as C++ std::vectors is used, and here it's made so that for a palette with the max of 256 colors, it'll have the exact alloc size*/ + if(!(info->palettesize & (info->palettesize - 1))) /*if palettesize is 0 or a power of two*/ + { + /*allocated data must be at least 4* palettesize (for 4 color bytes)*/ + size_t alloc_size = info->palettesize == 0 ? 4 : info->palettesize * 4 * 2; + data = (unsigned char*)realloc(info->palette, alloc_size); + if(!data) return 9931; + else info->palette = data; + } + info->palette[4 * info->palettesize + 0] = r; + info->palette[4 * info->palettesize + 1] = g; + info->palette[4 * info->palettesize + 2] = b; + info->palette[4 * info->palettesize + 3] = a; + info->palettesize++; + return 0; +} + +unsigned LodePNG_InfoColor_getBpp(const LodePNG_InfoColor* info) { return getBpp(info->colorType, info->bitDepth); } /*calculate bits per pixel out of colorType and bitDepth*/ +unsigned LodePNG_InfoColor_getChannels(const LodePNG_InfoColor* info) { return getNumColorChannels(info->colorType); } +unsigned LodePNG_InfoColor_isGreyscaleType(const LodePNG_InfoColor* info) { return info->colorType == 0 || info->colorType == 4; } +unsigned LodePNG_InfoColor_isAlphaType(const LodePNG_InfoColor* info) { return (info->colorType & 4) != 0; } + +unsigned LodePNG_InfoColor_equal(const LodePNG_InfoColor* info1, const LodePNG_InfoColor* info2) +{ + return info1->colorType == info2->colorType + && info1->bitDepth == info2->bitDepth; /*palette and color key not compared*/ +} + +#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS + +void LodePNG_UnknownChunks_init(LodePNG_UnknownChunks* chunks) +{ + unsigned i; + for(i = 0; i < 3; i++) chunks->data[i] = 0; + for(i = 0; i < 3; i++) chunks->datasize[i] = 0; +} + +void LodePNG_UnknownChunks_cleanup(LodePNG_UnknownChunks* chunks) +{ + unsigned i; + for(i = 0; i < 3; i++) free(chunks->data[i]); +} + +unsigned LodePNG_UnknownChunks_copy(LodePNG_UnknownChunks* dest, const LodePNG_UnknownChunks* src) +{ + unsigned i; + + LodePNG_UnknownChunks_cleanup(dest); + + for(i = 0; i < 3; i++) + { + size_t j; + dest->datasize[i] = src->datasize[i]; + dest->data[i] = (unsigned char*)malloc(src->datasize[i]); + if(!dest->data[i] && dest->datasize[i]) return 9932; + for(j = 0; j < src->datasize[i]; j++) dest->data[i][j] = src->data[i][j]; + } + + return 0; +} + +#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + +void LodePNG_Text_init(LodePNG_Text* text) +{ + text->num = 0; + text->keys = NULL; + text->strings = NULL; +} + +void LodePNG_Text_cleanup(LodePNG_Text* text) +{ + LodePNG_Text_clear(text); +} + +unsigned LodePNG_Text_copy(LodePNG_Text* dest, const LodePNG_Text* source) +{ + size_t i = 0; + dest->keys = 0; + dest->strings = 0; + dest->num = 0; + for(i = 0; i < source->num; i++) + { + unsigned error = LodePNG_Text_add(dest, source->keys[i], source->strings[i]); + if(error) return error; + } + return 0; +} + +void LodePNG_Text_clear(LodePNG_Text* text) +{ + size_t i; + for(i = 0; i < text->num; i++) + { + string_cleanup(&text->keys[i]); + string_cleanup(&text->strings[i]); + } + free(text->keys); + free(text->strings); +} + +unsigned LodePNG_Text_add(LodePNG_Text* text, const char* key, const char* str) +{ + char** new_keys = (char**)(realloc(text->keys, sizeof(char*) * (text->num + 1))); + char** new_strings = (char**)(realloc(text->strings, sizeof(char*) * (text->num + 1))); + if(!new_keys || !new_strings) + { + free(new_keys); + free(new_strings); + return 9933; + } + + text->num++; + text->keys = new_keys; + text->strings = new_strings; + + string_init(&text->keys[text->num - 1]); + string_set(&text->keys[text->num - 1], key); + + string_init(&text->strings[text->num - 1]); + string_set(&text->strings[text->num - 1], str); + + return 0; +} + +/******************************************************************************/ + +void LodePNG_IText_init(LodePNG_IText* text) +{ + text->num = 0; + text->keys = NULL; + text->langtags = NULL; + text->transkeys = NULL; + text->strings = NULL; +} + +void LodePNG_IText_cleanup(LodePNG_IText* text) +{ + LodePNG_IText_clear(text); +} + +unsigned LodePNG_IText_copy(LodePNG_IText* dest, const LodePNG_IText* source) +{ + size_t i = 0; + dest->keys = 0; + dest->langtags = 0; + dest->transkeys = 0; + dest->strings = 0; + dest->num = 0; + for(i = 0; i < source->num; i++) + { + unsigned error = LodePNG_IText_add(dest, source->keys[i], source->langtags[i], source->transkeys[i], source->strings[i]); + if(error) return error; + } + return 0; +} + +void LodePNG_IText_clear(LodePNG_IText* text) +{ + size_t i; + for(i = 0; i < text->num; i++) + { + string_cleanup(&text->keys[i]); + string_cleanup(&text->langtags[i]); + string_cleanup(&text->transkeys[i]); + string_cleanup(&text->strings[i]); + } + free(text->keys); + free(text->langtags); + free(text->transkeys); + free(text->strings); +} + +unsigned LodePNG_IText_add(LodePNG_IText* text, const char* key, const char* langtag, const char* transkey, const char* str) +{ + char** new_keys = (char**)(realloc(text->keys, sizeof(char*) * (text->num + 1))); + char** new_langtags = (char**)(realloc(text->langtags, sizeof(char*) * (text->num + 1))); + char** new_transkeys = (char**)(realloc(text->transkeys, sizeof(char*) * (text->num + 1))); + char** new_strings = (char**)(realloc(text->strings, sizeof(char*) * (text->num + 1))); + if(!new_keys || !new_langtags || !new_transkeys || !new_strings) + { + free(new_keys); + free(new_langtags); + free(new_transkeys); + free(new_strings); + return 9934; + } + + text->num++; + text->keys = new_keys; + text->langtags = new_langtags; + text->transkeys = new_transkeys; + text->strings = new_strings; + + string_init(&text->keys[text->num - 1]); + string_set(&text->keys[text->num - 1], key); + + string_init(&text->langtags[text->num - 1]); + string_set(&text->langtags[text->num - 1], langtag); + + string_init(&text->transkeys[text->num - 1]); + string_set(&text->transkeys[text->num - 1], transkey); + + string_init(&text->strings[text->num - 1]); + string_set(&text->strings[text->num - 1], str); + + return 0; +} + +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +void LodePNG_InfoPng_init(LodePNG_InfoPng* info) +{ + info->width = info->height = 0; + LodePNG_InfoColor_init(&info->color); + info->interlaceMethod = 0; + info->compressionMethod = 0; + info->filterMethod = 0; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + info->background_defined = 0; + info->background_r = info->background_g = info->background_b = 0; + + LodePNG_Text_init(&info->text); + LodePNG_IText_init(&info->itext); + + info->time_defined = 0; + info->phys_defined = 0; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS + LodePNG_UnknownChunks_init(&info->unknown_chunks); +#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ +} + +void LodePNG_InfoPng_cleanup(LodePNG_InfoPng* info) +{ + LodePNG_InfoColor_cleanup(&info->color); +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + LodePNG_Text_cleanup(&info->text); + LodePNG_IText_cleanup(&info->itext); +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS + LodePNG_UnknownChunks_cleanup(&info->unknown_chunks); +#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ +} + +unsigned LodePNG_InfoPng_copy(LodePNG_InfoPng* dest, const LodePNG_InfoPng* source) +{ + unsigned error = 0; + LodePNG_InfoPng_cleanup(dest); + *dest = *source; + LodePNG_InfoColor_init(&dest->color); + error = LodePNG_InfoColor_copy(&dest->color, &source->color); if(error) return error; + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + error = LodePNG_Text_copy(&dest->text, &source->text); if(error) return error; + error = LodePNG_IText_copy(&dest->itext, &source->itext); if(error) return error; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS + LodePNG_UnknownChunks_init(&dest->unknown_chunks); + error = LodePNG_UnknownChunks_copy(&dest->unknown_chunks, &source->unknown_chunks); if(error) return error; +#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ + return error; +} + +void LodePNG_InfoPng_swap(LodePNG_InfoPng* a, LodePNG_InfoPng* b) +{ + LodePNG_InfoPng temp = *a; + *a = *b; + *b = temp; +} + +unsigned LodePNG_InfoColor_copy(LodePNG_InfoColor* dest, const LodePNG_InfoColor* source) +{ + size_t i; + LodePNG_InfoColor_cleanup(dest); + *dest = *source; + dest->palette = (unsigned char*)malloc(source->palettesize * 4); + if(!dest->palette && source->palettesize) return 9935; + for(i = 0; i < source->palettesize * 4; i++) dest->palette[i] = source->palette[i]; + return 0; +} + +void LodePNG_InfoRaw_init(LodePNG_InfoRaw* info) +{ + LodePNG_InfoColor_init(&info->color); +} + +void LodePNG_InfoRaw_cleanup(LodePNG_InfoRaw* info) +{ + LodePNG_InfoColor_cleanup(&info->color); +} + +unsigned LodePNG_InfoRaw_copy(LodePNG_InfoRaw* dest, const LodePNG_InfoRaw* source) +{ + unsigned error = 0; + LodePNG_InfoRaw_cleanup(dest); + *dest = *source; + LodePNG_InfoColor_init(&dest->color); + error = LodePNG_InfoColor_copy(&dest->color, &source->color); if(error) return error; + return error; +} + +/* ////////////////////////////////////////////////////////////////////////// */ + +/* +converts from any color type to 24-bit or 32-bit (later maybe more supported). return value = LodePNG error code +the out buffer must have (w * h * bpp + 7) / 8 bytes, where bpp is the bits per pixel of the output color type (LodePNG_InfoColor_getBpp) +for < 8 bpp images, there may _not_ be padding bits at the end of scanlines. +*/ +unsigned LodePNG_convert(unsigned char* out, const unsigned char* in, LodePNG_InfoColor* infoOut, LodePNG_InfoColor* infoIn, unsigned w, unsigned h) +{ + const size_t numpixels = w * h; /*amount of pixels*/ + const unsigned OUT_BYTES = LodePNG_InfoColor_getBpp(infoOut) / 8; /*bytes per pixel in the output image*/ + const unsigned OUT_ALPHA = LodePNG_InfoColor_isAlphaType(infoOut); /*use 8-bit alpha channel*/ + size_t i, c, bp = 0; /*bitpointer, used by less-than-8-bit color types*/ + + /*cases where in and out already have the same format*/ + if(LodePNG_InfoColor_equal(infoIn, infoOut)) + { + size_t i, size = (w * h * LodePNG_InfoColor_getBpp(infoIn) + 7) / 8; + for(i = 0; i < size; i++) out[i] = in[i]; + return 0; + } + + if((infoOut->colorType == 2 || infoOut->colorType == 6) && infoOut->bitDepth == 8) + { + if(infoIn->bitDepth == 8) + { + switch(infoIn->colorType) + { + case 0: /*greyscale color*/ + for(i = 0; i < numpixels; i++) + { + if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; + out[OUT_BYTES * i + 0] = out[OUT_BYTES * i + 1] = out[OUT_BYTES * i + 2] = in[i]; + if(OUT_ALPHA && infoIn->key_defined && in[i] == infoIn->key_r) out[OUT_BYTES * i + 3] = 0; + } + break; + case 2: /*RGB color*/ + for(i = 0; i < numpixels; i++) + { + if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; + for(c = 0; c < 3; c++) out[OUT_BYTES * i + c] = in[3 * i + c]; + if(OUT_ALPHA && infoIn->key_defined == 1 && in[3 * i + 0] == infoIn->key_r && in[3 * i + 1] == infoIn->key_g && in[3 * i + 2] == infoIn->key_b) out[OUT_BYTES * i + 3] = 0; + } + break; + case 3: /*indexed color (palette)*/ + for(i = 0; i < numpixels; i++) + { + if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; + if(in[i] >= infoIn->palettesize) return 46; + for(c = 0; c < OUT_BYTES; c++) out[OUT_BYTES * i + c] = infoIn->palette[4 * in[i] + c]; /*get rgb colors from the palette*/ + } + break; + case 4: /*greyscale with alpha*/ + for(i = 0; i < numpixels; i++) + { + out[OUT_BYTES * i + 0] = out[OUT_BYTES * i + 1] = out[OUT_BYTES * i + 2] = in[2 * i + 0]; + if(OUT_ALPHA) out[OUT_BYTES * i + 3] = in[2 * i + 1]; + } + break; + case 6: /*RGB with alpha*/ + for(i = 0; i < numpixels; i++) + { + for(c = 0; c < OUT_BYTES; c++) out[OUT_BYTES * i + c] = in[4 * i + c]; + } + break; + default: break; + } + } + else if(infoIn->bitDepth == 16) + { + switch(infoIn->colorType) + { + case 0: /*greyscale color*/ + for(i = 0; i < numpixels; i++) + { + if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; + out[OUT_BYTES * i + 0] = out[OUT_BYTES * i + 1] = out[OUT_BYTES * i + 2] = in[2 * i]; + if(OUT_ALPHA && infoIn->key_defined && 256U * in[i] + in[i + 1] == infoIn->key_r) out[OUT_BYTES * i + 3] = 0; + } + break; + case 2: /*RGB color*/ + for(i = 0; i < numpixels; i++) + { + if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; + for(c = 0; c < 3; c++) out[OUT_BYTES * i + c] = in[6 * i + 2 * c]; + if(OUT_ALPHA && infoIn->key_defined && 256U * in[6 * i + 0] + in[6 * i + 1] == infoIn->key_r && 256U * in[6 * i + 2] + in[6 * i + 3] == infoIn->key_g && 256U * in[6 * i + 4] + in[6 * i + 5] == infoIn->key_b) out[OUT_BYTES * i + 3] = 0; + } + break; + case 4: /*greyscale with alpha*/ + for(i = 0; i < numpixels; i++) + { + out[OUT_BYTES * i + 0] = out[OUT_BYTES * i + 1] = out[OUT_BYTES * i + 2] = in[4 * i]; /*most significant byte*/ + if(OUT_ALPHA) out[OUT_BYTES * i + 3] = in[4 * i + 2]; + } + break; + case 6: /*RGB with alpha*/ + for(i = 0; i < numpixels; i++) + { + for(c = 0; c < OUT_BYTES; c++) out[OUT_BYTES * i + c] = in[8 * i + 2 * c]; + } + break; + default: break; + } + } + else /*infoIn->bitDepth is less than 8 bit per channel*/ + { + switch(infoIn->colorType) + { + case 0: /*greyscale color*/ + for(i = 0; i < numpixels; i++) + { + unsigned value = readBitsFromReversedStream(&bp, in, infoIn->bitDepth); + if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; + if(OUT_ALPHA && infoIn->key_defined && value && ((1U << infoIn->bitDepth) - 1U) == infoIn->key_r && ((1U << infoIn->bitDepth) - 1U)) out[OUT_BYTES * i + 3] = 0; + value = (value * 255) / ((1 << infoIn->bitDepth) - 1); /*scale value from 0 to 255*/ + out[OUT_BYTES * i + 0] = out[OUT_BYTES * i + 1] = out[OUT_BYTES * i + 2] = (unsigned char)(value); + } + break; + case 3: /*indexed color (palette)*/ + for(i = 0; i < numpixels; i++) + { + unsigned value = readBitsFromReversedStream(&bp, in, infoIn->bitDepth); + if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; + if(value >= infoIn->palettesize) return 47; + for(c = 0; c < OUT_BYTES; c++) out[OUT_BYTES * i + c] = infoIn->palette[4 * value + c]; /*get rgb colors from the palette*/ + } + break; + default: break; + } + } + } + else if(LodePNG_InfoColor_isGreyscaleType(infoOut) && infoOut->bitDepth == 8) /*conversion from greyscale to greyscale*/ + { + if(!LodePNG_InfoColor_isGreyscaleType(infoIn)) return 62; + if(infoIn->bitDepth == 8) + { + switch(infoIn->colorType) + { + case 0: /*greyscale color*/ + for(i = 0; i < numpixels; i++) + { + if(OUT_ALPHA) out[OUT_BYTES * i + 1] = 255; + out[OUT_BYTES * i] = in[i]; + if(OUT_ALPHA && infoIn->key_defined && in[i] == infoIn->key_r) out[OUT_BYTES * i + 1] = 0; + } + break; + case 4: /*greyscale with alpha*/ + for(i = 0; i < numpixels; i++) + { + out[OUT_BYTES * i + 0] = in[2 * i + 0]; + if(OUT_ALPHA) out[OUT_BYTES * i + 1] = in[2 * i + 1]; + } + break; + default: return 31; + } + } + else if(infoIn->bitDepth == 16) + { + switch(infoIn->colorType) + { + case 0: /*greyscale color*/ + for(i = 0; i < numpixels; i++) + { + if(OUT_ALPHA) out[OUT_BYTES * i + 1] = 255; + out[OUT_BYTES * i] = in[2 * i]; + if(OUT_ALPHA && infoIn->key_defined && 256U * in[i] + in[i + 1] == infoIn->key_r) out[OUT_BYTES * i + 1] = 0; + } + break; + case 4: /*greyscale with alpha*/ + for(i = 0; i < numpixels; i++) + { + out[OUT_BYTES * i] = in[4 * i]; /*most significant byte*/ + if(OUT_ALPHA) out[OUT_BYTES * i + 1] = in[4 * i + 2]; /*most significant byte*/ + } + break; + default: return 31; + } + } + else /*infoIn->bitDepth is less than 8 bit per channel*/ + { + if(infoIn->colorType != 0) return 31; /*colorType 0 is the only greyscale type with < 8 bits per channel*/ + for(i = 0; i < numpixels; i++) + { + unsigned value = readBitsFromReversedStream(&bp, in, infoIn->bitDepth); + if(OUT_ALPHA) out[OUT_BYTES * i + 1] = 255; + if(OUT_ALPHA && infoIn->key_defined && value && ((1U << infoIn->bitDepth) - 1U) == infoIn->key_r && ((1U << infoIn->bitDepth) - 1U)) out[OUT_BYTES * i + 1] = 0; + value = (value * 255) / ((1 << infoIn->bitDepth) - 1); /*scale value from 0 to 255*/ + out[OUT_BYTES * i] = (unsigned char)(value); + } + } + } + else return 59; + + return 0; +} + +/*Paeth predicter, used by PNG filter type 4*/ +static int paethPredictor(int a, int b, int c) +{ + int p = a + b - c; + int pa = p > a ? p - a : a - p; + int pb = p > b ? p - b : b - p; + int pc = p > c ? p - c : c - p; + + if(pa <= pb && pa <= pc) return a; + else if(pb <= pc) return b; + else return c; +} + +/*shared values used by multiple Adam7 related functions*/ + +static const unsigned ADAM7_IX[7] = { 0, 4, 0, 2, 0, 1, 0 }; /*x start values*/ +static const unsigned ADAM7_IY[7] = { 0, 0, 4, 0, 2, 0, 1 }; /*y start values*/ +static const unsigned ADAM7_DX[7] = { 8, 8, 4, 4, 2, 2, 1 }; /*x delta values*/ +static const unsigned ADAM7_DY[7] = { 8, 8, 8, 4, 4, 2, 2 }; /*y delta values*/ + +static void Adam7_getpassvalues(unsigned passw[7], unsigned passh[7], size_t filter_passstart[8], size_t padded_passstart[8], size_t passstart[8], unsigned w, unsigned h, unsigned bpp) +{ + /*the passstart values have 8 values: the 8th one actually indicates the byte after the end of the 7th (= last) pass*/ + unsigned i; + + /*calculate width and height in pixels of each pass*/ + for(i = 0; i < 7; i++) + { + passw[i] = (w + ADAM7_DX[i] - ADAM7_IX[i] - 1) / ADAM7_DX[i]; + passh[i] = (h + ADAM7_DY[i] - ADAM7_IY[i] - 1) / ADAM7_DY[i]; + if(passw[i] == 0) passh[i] = 0; + if(passh[i] == 0) passw[i] = 0; + } + + filter_passstart[0] = padded_passstart[0] = passstart[0] = 0; + for(i = 0; i < 7; i++) + { + filter_passstart[i + 1] = filter_passstart[i] + ((passw[i] && passh[i]) ? passh[i] * (1 + (passw[i] * bpp + 7) / 8) : 0); /*if passw[i] is 0, it's 0 bytes, not 1 (no filtertype-byte)*/ + padded_passstart[i + 1] = padded_passstart[i] + passh[i] * ((passw[i] * bpp + 7) / 8); /*bits padded if needed to fill full byte at end of each scanline*/ + passstart[i + 1] = passstart[i] + (passh[i] * passw[i] * bpp + 7) / 8; /*only padded at end of reduced image*/ + } +} + +#ifdef LODEPNG_COMPILE_DECODER + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / PNG Decoder / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +/*read the information from the header and store it in the LodePNG_Info. return value is error*/ +void LodePNG_inspect(LodePNG_Decoder* decoder, const unsigned char* in, size_t inlength) +{ + if(inlength == 0 || in == 0) { decoder->error = 48; return; } /*the given data is empty*/ + if(inlength < 29) { decoder->error = 27; return; } /*error: the data length is smaller than the length of the header*/ + + /*when decoding a new PNG image, make sure all parameters created after previous decoding are reset*/ + LodePNG_InfoPng_cleanup(&decoder->infoPng); + LodePNG_InfoPng_init(&decoder->infoPng); + decoder->error = 0; + + if(in[0] != 137 || in[1] != 80 || in[2] != 78 || in[3] != 71 || in[4] != 13 || in[5] != 10 || in[6] != 26 || in[7] != 10) { decoder->error = 28; return; } /*error: the first 8 bytes are not the correct PNG signature*/ + if(in[12] != 'I' || in[13] != 'H' || in[14] != 'D' || in[15] != 'R') { decoder->error = 29; return; } /*error: it doesn't start with a IHDR chunk!*/ + + /*read the values given in the header*/ + decoder->infoPng.width = LodePNG_read32bitInt(&in[16]); + decoder->infoPng.height = LodePNG_read32bitInt(&in[20]); + decoder->infoPng.color.bitDepth = in[24]; + decoder->infoPng.color.colorType = in[25]; + decoder->infoPng.compressionMethod = in[26]; + decoder->infoPng.filterMethod = in[27]; + decoder->infoPng.interlaceMethod = in[28]; + + if(!decoder->settings.ignoreCrc) + { + unsigned CRC = LodePNG_read32bitInt(&in[29]); + unsigned checksum = Crc32_crc(&in[12], 17); + if(CRC != checksum) { decoder->error = 57; return; } + } + + if(decoder->infoPng.compressionMethod != 0) { decoder->error = 32; return; } /*error: only compression method 0 is allowed in the specification*/ + if(decoder->infoPng.filterMethod != 0) { decoder->error = 33; return; } /*error: only filter method 0 is allowed in the specification*/ + if(decoder->infoPng.interlaceMethod > 1) { decoder->error = 34; return; } /*error: only interlace methods 0 and 1 exist in the specification*/ + + decoder->error = checkColorValidity(decoder->infoPng.color.colorType, decoder->infoPng.color.bitDepth); +} + +static unsigned unfilterScanline(unsigned char* recon, const unsigned char* scanline, const unsigned char* precon, size_t bytewidth, unsigned char filterType, size_t length) +{ + /* + For PNG filter method 0 + unfilter a PNG image scanline by scanline. when the pixels are smaller than 1 byte, the filter works byte per byte (bytewidth = 1) + precon is the previous unfiltered scanline, recon the result, scanline the current one + the incoming scanlines do NOT include the filtertype byte, that one is given in the parameter filterType instead + recon and scanline MAY be the same memory address! precon must be disjoint. + */ + + size_t i; + switch(filterType) + { + case 0: + for(i = 0; i < length; i++) recon[i] = scanline[i]; + break; + case 1: + for(i = 0; i < bytewidth; i++) recon[i] = scanline[i]; + for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth]; + break; + case 2: + if(precon) for(i = 0; i < length; i++) recon[i] = scanline[i] + precon[i]; + else for(i = 0; i < length; i++) recon[i] = scanline[i]; + break; + case 3: + if(precon) + { + for(i = 0; i < bytewidth; i++) recon[i] = scanline[i] + precon[i] / 2; + for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + ((recon[i - bytewidth] + precon[i]) / 2); + } + else + { + for(i = 0; i < bytewidth; i++) recon[i] = scanline[i]; + for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth] / 2; + } + break; + case 4: + if(precon) + { + for(i = 0; i < bytewidth; i++) recon[i] = (unsigned char)(scanline[i] + paethPredictor(0, precon[i], 0)); + for(i = bytewidth; i < length; i++) recon[i] = (unsigned char)(scanline[i] + paethPredictor(recon[i - bytewidth], precon[i], precon[i - bytewidth])); + } + else + { + for(i = 0; i < bytewidth; i++) recon[i] = scanline[i]; + for(i = bytewidth; i < length; i++) recon[i] = (unsigned char)(scanline[i] + paethPredictor(recon[i - bytewidth], 0, 0)); + } + break; + default: return 36; /*error: unexisting filter type given*/ + } + return 0; +} + +static unsigned unfilter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) +{ + /* + For PNG filter method 0 + this function unfilters a single image (e.g. without interlacing this is called once, with Adam7 it's called 7 times) + out must have enough bytes allocated already, in must have the scanlines + 1 filtertype byte per scanline + w and h are image dimensions or dimensions of reduced image, bpp is bits per pixel + in and out are allowed to be the same memory address! + */ + + unsigned y; + unsigned char* prevline = 0; + + size_t bytewidth = (bpp + 7) / 8; /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/ + size_t linebytes = (w * bpp + 7) / 8; + + for(y = 0; y < h; y++) + { + size_t outindex = linebytes * y; + size_t inindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/ + unsigned char filterType = in[inindex]; + + unsigned error = unfilterScanline(&out[outindex], &in[inindex + 1], prevline, bytewidth, filterType, linebytes); + if(error) return error; + + prevline = &out[outindex]; + } + + return 0; +} + +static void Adam7_deinterlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) +{ + /*Note: this function works on image buffers WITHOUT padding bits at end of scanlines with non-multiple-of-8 bit amounts, only between reduced images is padding + out must be big enough AND must be 0 everywhere if bpp < 8 in the current implementation (because that's likely a little bit faster)*/ + unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; + unsigned i; + + Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); + + if(bpp >= 8) + { + for(i = 0; i < 7; i++) + { + unsigned x, y, b; + size_t bytewidth = bpp / 8; + for(y = 0; y < passh[i]; y++) + for(x = 0; x < passw[i]; x++) + { + size_t pixelinstart = passstart[i] + (y * passw[i] + x) * bytewidth; + size_t pixeloutstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth; + for(b = 0; b < bytewidth; b++) + { + out[pixeloutstart + b] = in[pixelinstart + b]; + } + } + } + } + else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ + { + for(i = 0; i < 7; i++) + { + unsigned x, y, b; + unsigned ilinebits = bpp * passw[i]; + unsigned olinebits = bpp * w; + size_t obp, ibp; /*bit pointers (for out and in buffer)*/ + for(y = 0; y < passh[i]; y++) + for(x = 0; x < passw[i]; x++) + { + ibp = (8 * passstart[i]) + (y * ilinebits + x * bpp); + obp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp; + for(b = 0; b < bpp; b++) + { + unsigned char bit = readBitFromReversedStream(&ibp, in); + setBitOfReversedStream0(&obp, out, bit); /*note that this function assumes the out buffer is completely 0, use setBitOfReversedStream otherwise*/ + } + } + } + } +} + +static void removePaddingBits(unsigned char* out, const unsigned char* in, size_t olinebits, size_t ilinebits, unsigned h) +{ + /* + After filtering there are still padding bits if scanlines have non multiple of 8 bit amounts. They need to be removed (except at last scanline of (Adam7-reduced) image) before working with pure image buffers for the Adam7 code, the color convert code and the output to the user. + in and out are allowed to be the same buffer, in may also be higher but still overlapping; in must have >= ilinebits*h bits, out must have >= olinebits*h bits, olinebits must be <= ilinebits + also used to move bits after earlier such operations happened, e.g. in a sequence of reduced images from Adam7 + only useful if (ilinebits - olinebits) is a value in the range 1..7 + */ + unsigned y; + size_t diff = ilinebits - olinebits; + size_t obp = 0, ibp = 0; /*bit pointers*/ + for(y = 0; y < h; y++) + { + size_t x; + for(x = 0; x < olinebits; x++) + { + unsigned char bit = readBitFromReversedStream(&ibp, in); + setBitOfReversedStream(&obp, out, bit); + } + ibp += diff; + } +} + +/*out must be buffer big enough to contain full image, and in must contain the full decompressed data from the IDAT chunks*/ +static unsigned postProcessScanlines(unsigned char* out, unsigned char* in, const LodePNG_InfoPng* infoPng) /*return value is error*/ +{ + /* + This function converts the filtered-padded-interlaced data into pure 2D image buffer with the PNG's colortype. Steps: + *) if no Adam7: 1) unfilter 2) remove padding bits (= posible extra bits per scanline if bpp < 8) + *) if adam7: 1) 7x unfilter 2) 7x remove padding bits 3) Adam7_deinterlace + NOTE: the in buffer will be overwritten with intermediate data! + */ + unsigned bpp = LodePNG_InfoColor_getBpp(&infoPng->color); + unsigned w = infoPng->width; + unsigned h = infoPng->height; + unsigned error = 0; + if(bpp == 0) return 31; /*error: invalid colortype*/ + + if(infoPng->interlaceMethod == 0) + { + if(bpp < 8 && w * bpp != ((w * bpp + 7) / 8) * 8) + { + error = unfilter(in, in, w, h, bpp); + if(error) return error; + removePaddingBits(out, in, w * bpp, ((w * bpp + 7) / 8) * 8, h); + } + else error = unfilter(out, in, w, h, bpp); /*we can immediatly filter into the out buffer, no other steps needed*/ + } + else /*interlaceMethod is 1 (Adam7)*/ + { + unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; + unsigned i; + + Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); + + for(i = 0; i < 7; i++) + { + error = unfilter(&in[padded_passstart[i]], &in[filter_passstart[i]], passw[i], passh[i], bpp); + if(error) return error; + if(bpp < 8) /*TODO: possible efficiency improvement: if in this reduced image the bits fit nicely in 1 scanline, move bytes instead of bits or move not at all*/ + { + /*remove padding bits in scanlines; after this there still may be padding bits between the different reduced images: each reduced image still starts nicely at a byte*/ + removePaddingBits(&in[passstart[i]], &in[padded_passstart[i]], passw[i] * bpp, ((passw[i] * bpp + 7) / 8) * 8, passh[i]); + } + } + + Adam7_deinterlace(out, in, w, h, bpp); + } + + return error; +} + +/*read a PNG, the result will be in the same color type as the PNG (hence "generic")*/ +static void decodeGeneric(LodePNG_Decoder* decoder, unsigned char** out, size_t* outsize, const unsigned char* in, size_t size) +{ + unsigned char IEND = 0; + const unsigned char* chunk; + size_t i; + ucvector idat; /*the data from idat chunks*/ + + /*for unknown chunk order*/ + unsigned unknown = 0; + unsigned critical_pos = 1; /*1 = after IHDR, 2 = after PLTE, 3 = after IDAT*/ + + /*provide some proper output values if error will happen*/ + *out = 0; + *outsize = 0; + + if(size == 0 || in == 0) { decoder->error = 48; return; } /*the given data is empty*/ + + LodePNG_inspect(decoder, in, size); /*reads header and resets other parameters in decoder->infoPng*/ + if(decoder->error) return; + + ucvector_init(&idat); + + chunk = &in[33]; /*first byte of the first chunk after the header*/ + + while(!IEND) /*loop through the chunks, ignoring unknown chunks and stopping at IEND chunk. IDAT data is put at the start of the in buffer*/ + { + unsigned chunkLength; + const unsigned char* data; /*the data in the chunk*/ + + if((size_t)((chunk - in) + 12) > size || chunk < in) { decoder->error = 30; break; } /*error: size of the in buffer too small to contain next chunk*/ + chunkLength = LodePNG_chunk_length(chunk); /*length of the data of the chunk, excluding the length bytes, chunk type and CRC bytes*/ + if(chunkLength > 2147483647) { decoder->error = 63; break; } + if((size_t)((chunk - in) + chunkLength + 12) > size || (chunk + chunkLength + 12) < in) { decoder->error = 35; break; } /*error: size of the in buffer too small to contain next chunk*/ + data = LodePNG_chunk_data_const(chunk); + + /*IDAT chunk, containing compressed image data*/ + if(LodePNG_chunk_type_equals(chunk, "IDAT")) + { + size_t oldsize = idat.size; + if(!ucvector_resize(&idat, oldsize + chunkLength)) { decoder->error = 9936; break; } + for(i = 0; i < chunkLength; i++) idat.data[oldsize + i] = data[i]; + critical_pos = 3; + } + /*IEND chunk*/ + else if(LodePNG_chunk_type_equals(chunk, "IEND")) + { + IEND = 1; + } + /*palette chunk (PLTE)*/ + else if(LodePNG_chunk_type_equals(chunk, "PLTE")) + { + unsigned pos = 0; + if(decoder->infoPng.color.palette) free(decoder->infoPng.color.palette); + decoder->infoPng.color.palettesize = chunkLength / 3; + decoder->infoPng.color.palette = (unsigned char*)malloc(4 * decoder->infoPng.color.palettesize); + if(!decoder->infoPng.color.palette && decoder->infoPng.color.palettesize) { decoder->error = 9937; break; } + if(!decoder->infoPng.color.palette) decoder->infoPng.color.palettesize = 0; /*malloc failed...*/ + if(decoder->infoPng.color.palettesize > 256) { decoder->error = 38; break; } /*error: palette too big*/ + for(i = 0; i < decoder->infoPng.color.palettesize; i++) + { + decoder->infoPng.color.palette[4 * i + 0] = data[pos++]; /*R*/ + decoder->infoPng.color.palette[4 * i + 1] = data[pos++]; /*G*/ + decoder->infoPng.color.palette[4 * i + 2] = data[pos++]; /*B*/ + decoder->infoPng.color.palette[4 * i + 3] = 255; /*alpha*/ + } + critical_pos = 2; + } + /*palette transparency chunk (tRNS)*/ + else if(LodePNG_chunk_type_equals(chunk, "tRNS")) + { + if(decoder->infoPng.color.colorType == 3) + { + if(chunkLength > decoder->infoPng.color.palettesize) { decoder->error = 39; break; } /*error: more alpha values given than there are palette entries*/ + for(i = 0; i < chunkLength; i++) decoder->infoPng.color.palette[4 * i + 3] = data[i]; + } + else if(decoder->infoPng.color.colorType == 0) + { + if(chunkLength != 2) { decoder->error = 40; break; } /*error: this chunk must be 2 bytes for greyscale image*/ + decoder->infoPng.color.key_defined = 1; + decoder->infoPng.color.key_r = decoder->infoPng.color.key_g = decoder->infoPng.color.key_b = 256 * data[0] + data[1]; + } + else if(decoder->infoPng.color.colorType == 2) + { + if(chunkLength != 6) { decoder->error = 41; break; } /*error: this chunk must be 6 bytes for RGB image*/ + decoder->infoPng.color.key_defined = 1; + decoder->infoPng.color.key_r = 256 * data[0] + data[1]; + decoder->infoPng.color.key_g = 256 * data[2] + data[3]; + decoder->infoPng.color.key_b = 256 * data[4] + data[5]; + } + else { decoder->error = 42; break; } /*error: tRNS chunk not allowed for other color models*/ + } +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /*background color chunk (bKGD)*/ + else if(LodePNG_chunk_type_equals(chunk, "bKGD")) + { + if(decoder->infoPng.color.colorType == 3) + { + if(chunkLength != 1) { decoder->error = 43; break; } /*error: this chunk must be 1 byte for indexed color image*/ + decoder->infoPng.background_defined = 1; + decoder->infoPng.background_r = decoder->infoPng.background_g = decoder->infoPng.background_g = data[0]; + } + else if(decoder->infoPng.color.colorType == 0 || decoder->infoPng.color.colorType == 4) + { + if(chunkLength != 2) { decoder->error = 44; break; } /*error: this chunk must be 2 bytes for greyscale image*/ + decoder->infoPng.background_defined = 1; + decoder->infoPng.background_r = decoder->infoPng.background_g = decoder->infoPng.background_b = 256 * data[0] + data[1]; + } + else if(decoder->infoPng.color.colorType == 2 || decoder->infoPng.color.colorType == 6) + { + if(chunkLength != 6) { decoder->error = 45; break; } /*error: this chunk must be 6 bytes for greyscale image*/ + decoder->infoPng.background_defined = 1; + decoder->infoPng.background_r = 256 * data[0] + data[1]; + decoder->infoPng.background_g = 256 * data[2] + data[3]; + decoder->infoPng.background_b = 256 * data[4] + data[5]; + } + } + /*text chunk (tEXt)*/ + else if(LodePNG_chunk_type_equals(chunk, "tEXt")) + { + if(decoder->settings.readTextChunks) + { + char *key = 0, *str = 0; + + while(!decoder->error) /*not really a while loop, only used to break on error*/ + { + unsigned length, string2_begin; + + for(length = 0; length < chunkLength && data[length] != 0; length++) ; + if(length + 1 >= chunkLength) { decoder->error = 75; break; } + key = (char*)malloc(length + 1); + if(!key) { decoder->error = 9938; break; } + key[length] = 0; + for(i = 0; i < length; i++) key[i] = data[i]; + + string2_begin = length + 1; + if(string2_begin > chunkLength) { decoder->error = 75; break; } + length = chunkLength - string2_begin; + str = (char*)malloc(length + 1); + if(!str) { decoder->error = 9939; break; } + str[length] = 0; + for(i = 0; i < length; i++) str[i] = data[string2_begin + i]; + + decoder->error = LodePNG_Text_add(&decoder->infoPng.text, key, str); + + break; + } + + free(key); + free(str); + } + } + /*compressed text chunk (zTXt)*/ + else if(LodePNG_chunk_type_equals(chunk, "zTXt")) + { + if(decoder->settings.readTextChunks) + { + unsigned length, string2_begin; + char *key = 0; + ucvector decoded; + + ucvector_init(&decoded); + + while(!decoder->error) /*not really a while loop, only used to break on error*/ + { + for(length = 0; length < chunkLength && data[length] != 0; length++) ; + if(length + 2 >= chunkLength) { decoder->error = 75; break; } + key = (char*)malloc(length + 1); + if(!key) { decoder->error = 9940; break; } + key[length] = 0; + for(i = 0; i < length; i++) key[i] = data[i]; + + if(data[length + 1] != 0) { decoder->error = 72; break; } /*the 0 byte indicating compression must be 0*/ + + string2_begin = length + 2; + if(string2_begin > chunkLength) { decoder->error = 75; break; } + length = chunkLength - string2_begin; + decoder->error = LodePNG_decompress(&decoded.data, &decoded.size, (unsigned char*)(&data[string2_begin]), length, &decoder->settings.zlibsettings); + if(decoder->error) break; + ucvector_push_back(&decoded, 0); + + decoder->error = LodePNG_Text_add(&decoder->infoPng.text, key, (char*)decoded.data); + + break; + } + + free(key); + ucvector_cleanup(&decoded); + if(decoder->error) break; + } + } + /*international text chunk (iTXt)*/ + else if(LodePNG_chunk_type_equals(chunk, "iTXt")) + { + if(decoder->settings.readTextChunks) + { + unsigned length, begin, compressed; + char *key = 0, *langtag = 0, *transkey = 0; + ucvector decoded; + ucvector_init(&decoded); + + while(!decoder->error) /*not really a while loop, only used to break on error*/ + { + if(chunkLength < 5) { decoder->error = 76; break; } + for(length = 0; length < chunkLength && data[length] != 0; length++) ; + if(length + 2 >= chunkLength) { decoder->error = 75; break; } + key = (char*)malloc(length + 1); + if(!key) { decoder->error = 9941; break; } + key[length] = 0; + for(i = 0; i < length; i++) key[i] = data[i]; + + compressed = data[length + 1]; + if(data[length + 2] != 0) { decoder->error = 72; break; } /*the 0 byte indicating compression must be 0*/ + + begin = length + 3; + length = 0; + for(i = begin; i < chunkLength && data[i] != 0; i++) length++; + if(begin + length + 1 >= chunkLength) { decoder->error = 75; break; } + langtag = (char*)malloc(length + 1); + if(!langtag) { decoder->error = 9942; break; } + langtag[length] = 0; + for(i = 0; i < length; i++) langtag[i] = data[begin + i]; + + begin += length + 1; + length = 0; + for(i = begin; i < chunkLength && data[i] != 0; i++) length++; + if(begin + length + 1 >= chunkLength) { decoder->error = 75; break; } + transkey = (char*)malloc(length + 1); + if(!transkey) { decoder->error = 9943; break; } + transkey[length] = 0; + for(i = 0; i < length; i++) transkey[i] = data[begin + i]; + + begin += length + 1; + if(begin > chunkLength) { decoder->error = 75; break; } + length = chunkLength - begin; + + if(compressed) + { + decoder->error = LodePNG_decompress(&decoded.data, &decoded.size, (unsigned char*)(&data[begin]), length, &decoder->settings.zlibsettings); + if(decoder->error) break; + ucvector_push_back(&decoded, 0); + } + else + { + if(!ucvector_resize(&decoded, length + 1)) { decoder->error = 9944; break; } + decoded.data[length] = 0; + for(i = 0; i < length; i++) decoded.data[i] = data[begin + i]; + } + + decoder->error = LodePNG_IText_add(&decoder->infoPng.itext, key, langtag, transkey, (char*)decoded.data); + + break; + } + + free(key); + free(langtag); + free(transkey); + ucvector_cleanup(&decoded); + if(decoder->error) break; + } + } + else if(LodePNG_chunk_type_equals(chunk, "tIME")) + { + if(chunkLength != 7) { decoder->error = 73; break; } + decoder->infoPng.time_defined = 1; + decoder->infoPng.time.year = 256 * data[0] + data[+ 1]; + decoder->infoPng.time.month = data[2]; + decoder->infoPng.time.day = data[3]; + decoder->infoPng.time.hour = data[4]; + decoder->infoPng.time.minute = data[5]; + decoder->infoPng.time.second = data[6]; + } + else if(LodePNG_chunk_type_equals(chunk, "pHYs")) + { + if(chunkLength != 9) { decoder->error = 74; break; } + decoder->infoPng.phys_defined = 1; + decoder->infoPng.phys_x = 16777216 * data[0] + 65536 * data[1] + 256 * data[2] + data[3]; + decoder->infoPng.phys_y = 16777216 * data[4] + 65536 * data[5] + 256 * data[6] + data[7]; + decoder->infoPng.phys_unit = data[8]; + } +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + else /*it's not an implemented chunk type, so ignore it: skip over the data*/ + { + if(LodePNG_chunk_critical(chunk)) { decoder->error = 69; break; } /*error: unknown critical chunk (5th bit of first byte of chunk type is 0)*/ + unknown = 1; +#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS + if(decoder->settings.rememberUnknownChunks) + { + LodePNG_UnknownChunks* unknown = &decoder->infoPng.unknown_chunks; + decoder->error = LodePNG_append_chunk(&unknown->data[critical_pos - 1], &unknown->datasize[critical_pos - 1], chunk); + if(decoder->error) break; + } +#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ + } + + if(!decoder->settings.ignoreCrc && !unknown) /*check CRC if wanted, only on known chunk types*/ + { + if(LodePNG_chunk_check_crc(chunk)) { decoder->error = 57; break; } + } + + if(!IEND) chunk = LodePNG_chunk_next_const(chunk); + } + + if(!decoder->error) + { + ucvector scanlines; + ucvector_init(&scanlines); + if(!ucvector_resize(&scanlines, ((decoder->infoPng.width * (decoder->infoPng.height * LodePNG_InfoColor_getBpp(&decoder->infoPng.color) + 7)) / 8) + decoder->infoPng.height)) decoder->error = 9945; /*maximum final image length is already reserved in the vector's length - this is not really necessary*/ + if(!decoder->error) decoder->error = LodePNG_decompress(&scanlines.data, &scanlines.size, idat.data, idat.size, &decoder->settings.zlibsettings); /*decompress with the Zlib decompressor*/ + + if(!decoder->error) + { + ucvector outv; + ucvector_init(&outv); + if(!ucvector_resizev(&outv, (decoder->infoPng.height * decoder->infoPng.width * LodePNG_InfoColor_getBpp(&decoder->infoPng.color) + 7) / 8, 0)) decoder->error = 9946; + if(!decoder->error) decoder->error = postProcessScanlines(outv.data, scanlines.data, &decoder->infoPng); + *out = outv.data; + *outsize = outv.size; + } + ucvector_cleanup(&scanlines); + } + + ucvector_cleanup(&idat); +} + +void LodePNG_decode(LodePNG_Decoder* decoder, unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize) +{ + *out = 0; + *outsize = 0; + decodeGeneric(decoder, out, outsize, in, insize); + if(decoder->error) return; + if(!decoder->settings.color_convert || LodePNG_InfoColor_equal(&decoder->infoRaw.color, &decoder->infoPng.color)) + { + /*same color type, no copying or converting of data needed*/ + /*store the infoPng color settings on the infoRaw so that the infoRaw still reflects what colorType + the raw image has to the end user*/ + if(!decoder->settings.color_convert) + { + decoder->error = LodePNG_InfoColor_copy(&decoder->infoRaw.color, &decoder->infoPng.color); + if(decoder->error) return; + } + } + else + { + /*color conversion needed; sort of copy of the data*/ + unsigned char* data = *out; + + /*TODO: check if this works according to the statement in the documentation: "The converter can convert from greyscale input color type, to 8-bit greyscale or greyscale with alpha"*/ + if(!(decoder->infoRaw.color.colorType == 2 || decoder->infoRaw.color.colorType == 6) && !(decoder->infoRaw.color.bitDepth == 8)) { decoder->error = 56; return; } + + *outsize = (decoder->infoPng.width * decoder->infoPng.height * LodePNG_InfoColor_getBpp(&decoder->infoRaw.color) + 7) / 8; + *out = (unsigned char*)malloc(*outsize); + if(!(*out)) + { + decoder->error = 9947; + *outsize = 0; + } + else decoder->error = LodePNG_convert(*out, data, &decoder->infoRaw.color, &decoder->infoPng.color, decoder->infoPng.width, decoder->infoPng.height); + free(data); + } +} + +unsigned LodePNG_decode32(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize) +{ + unsigned error; + size_t dummy_size; + LodePNG_Decoder decoder; + LodePNG_Decoder_init(&decoder); + LodePNG_decode(&decoder, out, &dummy_size, in, insize); + error = decoder.error; + *w = decoder.infoPng.width; + *h = decoder.infoPng.height; + LodePNG_Decoder_cleanup(&decoder); + return error; +} + +#ifdef LODEPNG_COMPILE_DISK +unsigned LodePNG_decode32f(unsigned char** out, unsigned* w, unsigned* h, const char* filename) +{ + unsigned char* buffer; + size_t buffersize; + unsigned error; + error = LodePNG_loadFile(&buffer, &buffersize, filename); + if(!error) error = LodePNG_decode32(out, w, h, buffer, buffersize); + free(buffer); + return error; +} +#endif /*LODEPNG_COMPILE_DISK*/ + +void LodePNG_DecodeSettings_init(LodePNG_DecodeSettings* settings) +{ + settings->color_convert = 1; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + settings->readTextChunks = 1; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + settings->ignoreCrc = 0; +#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS + settings->rememberUnknownChunks = 0; +#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ + LodeZlib_DecompressSettings_init(&settings->zlibsettings); +} + +void LodePNG_Decoder_init(LodePNG_Decoder* decoder) +{ + LodePNG_DecodeSettings_init(&decoder->settings); + LodePNG_InfoRaw_init(&decoder->infoRaw); + LodePNG_InfoPng_init(&decoder->infoPng); + decoder->error = 1; +} + +void LodePNG_Decoder_cleanup(LodePNG_Decoder* decoder) +{ + LodePNG_InfoRaw_cleanup(&decoder->infoRaw); + LodePNG_InfoPng_cleanup(&decoder->infoPng); +} + +void LodePNG_Decoder_copy(LodePNG_Decoder* dest, const LodePNG_Decoder* source) +{ + LodePNG_Decoder_cleanup(dest); + *dest = *source; + LodePNG_InfoRaw_init(&dest->infoRaw); + LodePNG_InfoPng_init(&dest->infoPng); + dest->error = LodePNG_InfoRaw_copy(&dest->infoRaw, &source->infoRaw); if(dest->error) return; + dest->error = LodePNG_InfoPng_copy(&dest->infoPng, &source->infoPng); if(dest->error) return; +} + +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / PNG Encoder / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +/*chunkName must be string of 4 characters*/ +static unsigned addChunk(ucvector* out, const char* chunkName, const unsigned char* data, size_t length) +{ + unsigned error = LodePNG_create_chunk(&out->data, &out->size, (unsigned)length, chunkName, data); + if(error) return error; + out->allocsize = out->size; /*fix the allocsize again*/ + return 0; +} + +static void writeSignature(ucvector* out) +{ + /*8 bytes PNG signature*/ + ucvector_push_back(out, 137); + ucvector_push_back(out, 80); + ucvector_push_back(out, 78); + ucvector_push_back(out, 71); + ucvector_push_back(out, 13); + ucvector_push_back(out, 10); + ucvector_push_back(out, 26); + ucvector_push_back(out, 10); +} + +static unsigned addChunk_IHDR(ucvector* out, unsigned w, unsigned h, unsigned bitDepth, unsigned colorType, unsigned interlaceMethod) +{ + unsigned error = 0; + ucvector header; + ucvector_init(&header); + + LodePNG_add32bitInt(&header, w); /*width*/ + LodePNG_add32bitInt(&header, h); /*height*/ + ucvector_push_back(&header, (unsigned char)bitDepth); /*bit depth*/ + ucvector_push_back(&header, (unsigned char)colorType); /*color type*/ + ucvector_push_back(&header, 0); /*compression method*/ + ucvector_push_back(&header, 0); /*filter method*/ + ucvector_push_back(&header, interlaceMethod); /*interlace method*/ + + error = addChunk(out, "IHDR", header.data, header.size); + ucvector_cleanup(&header); + + return error; +} + +static unsigned addChunk_PLTE(ucvector* out, const LodePNG_InfoColor* info) +{ + unsigned error = 0; + size_t i; + ucvector PLTE; + ucvector_init(&PLTE); + for(i = 0; i < info->palettesize * 4; i++) if(i % 4 != 3) ucvector_push_back(&PLTE, info->palette[i]); /*add all channels except alpha channel*/ + error = addChunk(out, "PLTE", PLTE.data, PLTE.size); + ucvector_cleanup(&PLTE); + + return error; +} + +static unsigned addChunk_tRNS(ucvector* out, const LodePNG_InfoColor* info) +{ + unsigned error = 0; + size_t i; + ucvector tRNS; + ucvector_init(&tRNS); + if(info->colorType == 3) + { + for(i = 0; i < info->palettesize; i++) ucvector_push_back(&tRNS, info->palette[4 * i + 3]); /*add only alpha channel*/ + } + else if(info->colorType == 0) + { + if(info->key_defined) + { + ucvector_push_back(&tRNS, (unsigned char)(info->key_r / 256)); + ucvector_push_back(&tRNS, (unsigned char)(info->key_r % 256)); + } + } + else if(info->colorType == 2) + { + if(info->key_defined) + { + ucvector_push_back(&tRNS, (unsigned char)(info->key_r / 256)); + ucvector_push_back(&tRNS, (unsigned char)(info->key_r % 256)); + ucvector_push_back(&tRNS, (unsigned char)(info->key_g / 256)); + ucvector_push_back(&tRNS, (unsigned char)(info->key_g % 256)); + ucvector_push_back(&tRNS, (unsigned char)(info->key_b / 256)); + ucvector_push_back(&tRNS, (unsigned char)(info->key_b % 256)); + } + } + + error = addChunk(out, "tRNS", tRNS.data, tRNS.size); + ucvector_cleanup(&tRNS); + + return error; +} + +static unsigned addChunk_IDAT(ucvector* out, const unsigned char* data, size_t datasize, LodeZlib_DeflateSettings* zlibsettings) +{ + ucvector zlibdata; + unsigned error = 0; + + /*compress with the Zlib compressor*/ + ucvector_init(&zlibdata); + error = LodePNG_compress(&zlibdata.data, &zlibdata.size, data, datasize, zlibsettings); + if(!error) error = addChunk(out, "IDAT", zlibdata.data, zlibdata.size); + ucvector_cleanup(&zlibdata); + + return error; +} + +static unsigned addChunk_IEND(ucvector* out) +{ + unsigned error = 0; + error = addChunk(out, "IEND", 0, 0); + return error; +} + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + +static unsigned addChunk_tEXt(ucvector* out, const char* keyword, const char* textstring) /*add text chunk*/ +{ + unsigned error = 0; + size_t i; + ucvector text; + ucvector_init(&text); + for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&text, (unsigned char)keyword[i]); + ucvector_push_back(&text, 0); + for(i = 0; textstring[i] != 0; i++) ucvector_push_back(&text, (unsigned char)textstring[i]); + error = addChunk(out, "tEXt", text.data, text.size); + ucvector_cleanup(&text); + + return error; +} + +static unsigned addChunk_zTXt(ucvector* out, const char* keyword, const char* textstring, LodeZlib_DeflateSettings* zlibsettings) +{ + unsigned error = 0; + ucvector data, compressed; + size_t i, textsize = strlen(textstring); + + ucvector_init(&data); + ucvector_init(&compressed); + for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&data, (unsigned char)keyword[i]); + ucvector_push_back(&data, 0); /* 0 termination char*/ + ucvector_push_back(&data, 0); /*compression method: 0*/ + + error = LodePNG_compress(&compressed.data, &compressed.size, (unsigned char*)textstring, textsize, zlibsettings); + if(!error) + { + for(i = 0; i < compressed.size; i++) ucvector_push_back(&data, compressed.data[i]); + error = addChunk(out, "zTXt", data.data, data.size); + } + + ucvector_cleanup(&compressed); + ucvector_cleanup(&data); + return error; +} + +static unsigned addChunk_iTXt(ucvector* out, unsigned compressed, const char* keyword, const char* langtag, const char* transkey, const char* textstring, LodeZlib_DeflateSettings* zlibsettings) +{ + unsigned error = 0; + ucvector data, compressed_data; + size_t i, textsize = strlen(textstring); + + ucvector_init(&data); + + for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&data, (unsigned char)keyword[i]); + ucvector_push_back(&data, 0); /*null termination char*/ + ucvector_push_back(&data, compressed ? 1 : 0); /*compression flag*/ + ucvector_push_back(&data, 0); /*compression method*/ + for(i = 0; langtag[i] != 0; i++) ucvector_push_back(&data, (unsigned char)langtag[i]); + ucvector_push_back(&data, 0); /*null termination char*/ + for(i = 0; transkey[i] != 0; i++) ucvector_push_back(&data, (unsigned char)transkey[i]); + ucvector_push_back(&data, 0); /*null termination char*/ + + if(compressed) + { + ucvector_init(&compressed_data); + error = LodePNG_compress(&compressed_data.data, &compressed_data.size, (unsigned char*)textstring, textsize, zlibsettings); + if(!error) + { + for(i = 0; i < compressed_data.size; i++) ucvector_push_back(&data, compressed_data.data[i]); + for(i = 0; textstring[i] != 0; i++) ucvector_push_back(&data, (unsigned char)textstring[i]); + } + } + else /*not compressed*/ + { + for(i = 0; textstring[i] != 0; i++) ucvector_push_back(&data, (unsigned char)textstring[i]); + } + + if(!error) error = addChunk(out, "iTXt", data.data, data.size); + ucvector_cleanup(&data); + return error; +} + +static unsigned addChunk_bKGD(ucvector* out, const LodePNG_InfoPng* info) +{ + unsigned error = 0; + ucvector bKGD; + ucvector_init(&bKGD); + if(info->color.colorType == 0 || info->color.colorType == 4) + { + ucvector_push_back(&bKGD, (unsigned char)(info->background_r / 256)); + ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256)); + } + else if(info->color.colorType == 2 || info->color.colorType == 6) + { + ucvector_push_back(&bKGD, (unsigned char)(info->background_r / 256)); + ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256)); + ucvector_push_back(&bKGD, (unsigned char)(info->background_g / 256)); + ucvector_push_back(&bKGD, (unsigned char)(info->background_g % 256)); + ucvector_push_back(&bKGD, (unsigned char)(info->background_b / 256)); + ucvector_push_back(&bKGD, (unsigned char)(info->background_b % 256)); + } + else if(info->color.colorType == 3) + { + ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256)); /*palette index*/ + } + + error = addChunk(out, "bKGD", bKGD.data, bKGD.size); + ucvector_cleanup(&bKGD); + + return error; +} + +static unsigned addChunk_tIME(ucvector* out, const LodePNG_Time* time) +{ + unsigned error = 0; + unsigned char* data = (unsigned char*)malloc(7); + if(!data) return 9948; + data[0] = (unsigned char)(time->year / 256); + data[1] = (unsigned char)(time->year % 256); + data[2] = time->month; + data[3] = time->day; + data[4] = time->hour; + data[5] = time->minute; + data[6] = time->second; + error = addChunk(out, "tIME", data, 7); + free(data); + return error; +} + +static unsigned addChunk_pHYs(ucvector* out, const LodePNG_InfoPng* info) +{ + unsigned error = 0; + ucvector data; + ucvector_init(&data); + + LodePNG_add32bitInt(&data, info->phys_x); + LodePNG_add32bitInt(&data, info->phys_y); + ucvector_push_back(&data, info->phys_unit); + + error = addChunk(out, "pHYs", data.data, data.size); + ucvector_cleanup(&data); + + return error; +} + +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +static void filterScanline(unsigned char* out, const unsigned char* scanline, const unsigned char* prevline, size_t length, size_t bytewidth, unsigned char filterType) +{ + size_t i; + switch(filterType) + { + case 0: + if(prevline) for(i = 0; i < length; i++) out[i] = scanline[i]; + else for(i = 0; i < length; i++) out[i] = scanline[i]; + break; + case 1: + if(prevline) + { + for(i = 0; i < bytewidth; i++) out[i] = scanline[i]; + for(i = bytewidth; i < length ; i++) out[i] = scanline[i] - scanline[i - bytewidth]; + } + else + { + for(i = 0; i < bytewidth; i++) out[i] = scanline[i]; + for(i = bytewidth; i < length; i++) out[i] = scanline[i] - scanline[i - bytewidth]; + } + break; + case 2: + if(prevline) for(i = 0; i < length; i++) out[i] = scanline[i] - prevline[i]; + else for(i = 0; i < length; i++) out[i] = scanline[i]; + break; + case 3: + if(prevline) + { + for(i = 0; i < bytewidth; i++) out[i] = scanline[i] - prevline[i] / 2; + for(i = bytewidth; i < length; i++) out[i] = scanline[i] - ((scanline[i - bytewidth] + prevline[i]) / 2); + } + else + { + for(i = 0; i < length; i++) out[i] = scanline[i]; + for(i = bytewidth; i < length; i++) out[i] = scanline[i] - scanline[i - bytewidth] / 2; + } + break; + case 4: + if(prevline) + { + for(i = 0; i < bytewidth; i++) out[i] = (unsigned char)(scanline[i] - paethPredictor(0, prevline[i], 0)); + for(i = bytewidth; i < length; i++) out[i] = (unsigned char)(scanline[i] - paethPredictor(scanline[i - bytewidth], prevline[i], prevline[i - bytewidth])); + } + else + { + for(i = 0; i < bytewidth; i++) out[i] = scanline[i]; + for(i = bytewidth; i < length; i++) out[i] = (unsigned char)(scanline[i] - paethPredictor(scanline[i - bytewidth], 0, 0)); + } + break; + default: return; /*unexisting filter type given*/ + } +} + +static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, const LodePNG_InfoColor* info) +{ + /* + For PNG filter method 0 + out must be a buffer with as size: h + (w * h * bpp + 7) / 8, because there are the scanlines with 1 extra byte per scanline + + There is a nice heuristic described here: http://www.cs.toronto.edu/~cosmin/pngtech/optipng.html. It says: + * If the image type is Palette, or the bit depth is smaller than 8, then do not filter the image (i.e. use fixed filtering, with the filter None). + * (The other case) If the image type is Grayscale or RGB (with or without Alpha), and the bit depth is not smaller than 8, then use adaptive filtering heuristic as follows: independently for each row, apply all five filters and select the filter that produces the smallest sum of absolute values per row. + + Here the above method is used mostly. Note though that it appears to be better to use the adaptive filtering on the plasma 8-bit palette example, but that image isn't the best reference for palette images in general. + */ + + unsigned bpp = LodePNG_InfoColor_getBpp(info); + size_t linebytes = (w * bpp + 7) / 8; /*the width of a scanline in bytes, not including the filter type*/ + size_t bytewidth = (bpp + 7) / 8; /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/ + const unsigned char* prevline = 0; + unsigned x, y; + unsigned heuristic; + unsigned error = 0; + + if(bpp == 0) return 31; /*invalid color type*/ + + /*choose heuristic as described above*/ + if(info->colorType == 3 || info->bitDepth < 8) heuristic = 0; + else heuristic = 1; + + if(heuristic == 0) /*None filtertype for everything*/ + { + for(y = 0; y < h; y++) + { + size_t outindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/ + size_t inindex = linebytes * y; + const unsigned TYPE = 0; + out[outindex] = TYPE; /*filter type byte*/ + filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, TYPE); + prevline = &in[inindex]; + } + } + else if(heuristic == 1) /*adaptive filtering*/ + { + size_t sum[5]; + ucvector attempt[5]; /*five filtering attempts, one for each filter type*/ + size_t smallest = 0; + unsigned type, bestType = 0; + + for(type = 0; type < 5; type++) ucvector_init(&attempt[type]); + for(type = 0; type < 5; type++) + { + if(!ucvector_resize(&attempt[type], linebytes)) { error = 9949; break; } + } + + if(!error) + { + for(y = 0; y < h; y++) + { + /*try the 5 filter types*/ + for(type = 0; type < 5; type++) + { + filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type); + + /*calculate the sum of the result*/ + sum[type] = 0; + for(x = 0; x < attempt[type].size; x+=3) sum[type] += attempt[type].data[x]; /*note that not all pixels are checked to speed this up while still having probably the best choice*/ + + /*check if this is smallest sum (or if type == 0 it's the first case so always store the values)*/ + if(type == 0 || sum[type] < smallest) + { + bestType = type; + smallest = sum[type]; + } + } + + prevline = &in[y * linebytes]; + + /*now fill the out values*/ + out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/ + for(x = 0; x < linebytes; x++) out[y * (linebytes + 1) + 1 + x] = attempt[bestType].data[x]; + } + } + + for(type = 0; type < 5; type++) ucvector_cleanup(&attempt[type]); + } + #if 0 /*deflate the scanline with a fixed tree after every filter attempt to see which one deflates best. This is slow, and _does not work as expected_: the heuristic gives smaller result!*/ + else if(heuristic == 2) /*adaptive filtering by using deflate*/ + { + size_t size[5]; + ucvector attempt[5]; /*five filtering attempts, one for each filter type*/ + size_t smallest; + unsigned type = 0, bestType = 0; + unsigned char* dummy; + LodeZlib_DeflateSettings deflatesettings = LodeZlib_defaultDeflateSettings; + deflatesettings.btype = 1; /*use fixed tree on the attempts so that the tree is not adapted to the filtertype on purpose, to simulate the true case where the tree is the same for the whole image*/ + for(type = 0; type < 5; type++) { ucvector_init(&attempt[type]); ucvector_resize(&attempt[type], linebytes); } + for(y = 0; y < h; y++) /*try the 5 filter types*/ + { + for(type = 0; type < 5; type++) + { + filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type); + size[type] = 0; dummy = 0; + LodePNG_compress(&dummy, &size[type], attempt[type].data, attempt[type].size, &deflatesettings); + free(dummy); + /*check if this is smallest size (or if type == 0 it's the first case so always store the values)*/ + if(type == 0 || size[type] < smallest) { bestType = type; smallest = size[type]; } + } + prevline = &in[y * linebytes]; + out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/ + for(x = 0; x < linebytes; x++) out[y * (linebytes + 1) + 1 + x] = attempt[bestType].data[x]; + } + for(type = 0; type < 5; type++) ucvector_cleanup(&attempt[type]); + } + #endif + + return error; +} + +static void addPaddingBits(unsigned char* out, const unsigned char* in, size_t olinebits, size_t ilinebits, unsigned h) +{ + /*The opposite of the removePaddingBits function + olinebits must be >= ilinebits*/ + unsigned y; + size_t diff = olinebits - ilinebits; + size_t obp = 0, ibp = 0; /*bit pointers*/ + for(y = 0; y < h; y++) + { + size_t x; + for(x = 0; x < ilinebits; x++) + { + unsigned char bit = readBitFromReversedStream(&ibp, in); + setBitOfReversedStream(&obp, out, bit); + } + /*obp += diff; --> no, fill in some value in the padding bits too, to avoid "Use of uninitialised value of size ###" warning from valgrind*/ + for(x = 0; x < diff; x++) setBitOfReversedStream(&obp, out, 0); + } +} + +static void Adam7_interlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) +{ + /*Note: this function works on image buffers WITHOUT padding bits at end of scanlines with non-multiple-of-8 bit amounts, only between reduced images is padding*/ + unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; + unsigned i; + + Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); + + if(bpp >= 8) + { + for(i = 0; i < 7; i++) + { + unsigned x, y, b; + size_t bytewidth = bpp / 8; + for(y = 0; y < passh[i]; y++) + for(x = 0; x < passw[i]; x++) + { + size_t pixelinstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth; + size_t pixeloutstart = passstart[i] + (y * passw[i] + x) * bytewidth; + for(b = 0; b < bytewidth; b++) + { + out[pixeloutstart + b] = in[pixelinstart + b]; + } + } + } + } + else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ + { + for(i = 0; i < 7; i++) + { + unsigned x, y, b; + unsigned ilinebits = bpp * passw[i]; + unsigned olinebits = bpp * w; + size_t obp, ibp; /*bit pointers (for out and in buffer)*/ + for(y = 0; y < passh[i]; y++) + for(x = 0; x < passw[i]; x++) + { + ibp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp; + obp = (8 * passstart[i]) + (y * ilinebits + x * bpp); + for(b = 0; b < bpp; b++) + { + unsigned char bit = readBitFromReversedStream(&ibp, in); + setBitOfReversedStream(&obp, out, bit); + } + } + } + } +} + +/*out must be buffer big enough to contain uncompressed IDAT chunk data, and in must contain the full image*/ +static unsigned preProcessScanlines(unsigned char** out, size_t* outsize, const unsigned char* in, const LodePNG_InfoPng* infoPng) /*return value is error*/ +{ + /* + This function converts the pure 2D image with the PNG's colortype, into filtered-padded-interlaced data. Steps: + *) if no Adam7: 1) add padding bits (= posible extra bits per scanline if bpp < 8) 2) filter + *) if adam7: 1) Adam7_interlace 2) 7x add padding bits 3) 7x filter + */ + unsigned bpp = LodePNG_InfoColor_getBpp(&infoPng->color); + unsigned w = infoPng->width; + unsigned h = infoPng->height; + unsigned error = 0; + + if(infoPng->interlaceMethod == 0) + { + *outsize = h + (h * ((w * bpp + 7) / 8)); /*image size plus an extra byte per scanline + possible padding bits*/ + *out = (unsigned char*)malloc(*outsize); + if(!(*out) && (*outsize)) error = 9950; + + if(!error) + { + if(bpp < 8 && w * bpp != ((w * bpp + 7) / 8) * 8) /*non multiple of 8 bits per scanline, padding bits needed per scanline*/ + { + ucvector padded; + ucvector_init(&padded); + if(!ucvector_resize(&padded, h * ((w * bpp + 7) / 8))) error = 9951; + if(!error) + { + addPaddingBits(padded.data, in, ((w * bpp + 7) / 8) * 8, w * bpp, h); + error = filter(*out, padded.data, w, h, &infoPng->color); + } + ucvector_cleanup(&padded); + } + else error = filter(*out, in, w, h, &infoPng->color); /*we can immediatly filter into the out buffer, no other steps needed*/ + } + } + else /*interlaceMethod is 1 (Adam7)*/ + { + unsigned char* adam7 = (unsigned char*)malloc((h * w * bpp + 7) / 8); + if(!adam7 && ((h * w * bpp + 7) / 8)) error = 9952; /*malloc failed*/ + + while(!error) /*not a real while loop, used to break out to cleanup to avoid a goto*/ + { + unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; + unsigned i; + + Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); + + *outsize = filter_passstart[7]; /*image size plus an extra byte per scanline + possible padding bits*/ + *out = (unsigned char*)malloc(*outsize); + if(!(*out) && (*outsize)) { error = 9953; break; } + + Adam7_interlace(adam7, in, w, h, bpp); + + for(i = 0; i < 7; i++) + { + if(bpp < 8) + { + ucvector padded; + ucvector_init(&padded); + if(!ucvector_resize(&padded, h * ((w * bpp + 7) / 8))) error = 9954; + if(!error) + { + addPaddingBits(&padded.data[padded_passstart[i]], &adam7[passstart[i]], ((passw[i] * bpp + 7) / 8) * 8, passw[i] * bpp, passh[i]); + error = filter(&(*out)[filter_passstart[i]], &padded.data[padded_passstart[i]], passw[i], passh[i], &infoPng->color); + } + + ucvector_cleanup(&padded); + } + else + { + error = filter(&(*out)[filter_passstart[i]], &adam7[padded_passstart[i]], passw[i], passh[i], &infoPng->color); + } + } + + break; + } + + free(adam7); + } + + return error; +} + +/*palette must have 4 * palettesize bytes allocated*/ +static unsigned isPaletteFullyOpaque(const unsigned char* palette, size_t palettesize) /*palette given in format RGBARGBARGBARGBA...*/ +{ + size_t i; + for(i = 0; i < palettesize; i++) + { + if(palette[4 * i + 3] != 255) return 0; + } + return 1; +} + +/*this function checks if the input image given by the user has no transparent pixels*/ +static unsigned isFullyOpaque(const unsigned char* image, unsigned w, unsigned h, const LodePNG_InfoColor* info) +{ + /*TODO: When the user specified a color key for the input image, then this function must also check for pixels that are the same as the color key and treat those as transparent.*/ + + unsigned i, numpixels = w * h; + if(info->colorType == 6) + { + if(info->bitDepth == 8) + { + for(i = 0; i < numpixels; i++) if(image[i * 4 + 3] != 255) return 0; + } + else + { + for(i = 0; i < numpixels; i++) if(image[i * 8 + 6] != 255 || image[i * 8 + 7] != 255) return 0; + } + return 1; /*no single pixel with alpha channel other than 255 found*/ + } + else if(info->colorType == 4) + { + if(info->bitDepth == 8) + { + for(i = 0; i < numpixels; i++) if(image[i * 2 + 1] != 255) return 0; + } + else + { + for(i = 0; i < numpixels; i++) if(image[i * 4 + 2] != 255 || image[i * 4 + 3] != 255) return 0; + } + return 1; /*no single pixel with alpha channel other than 255 found*/ + } + else if(info->colorType == 3) + { + /*when there's a palette, we could check every pixel for translucency, but much quicker is to just check the palette*/ + return(isPaletteFullyOpaque(info->palette, info->palettesize)); + } + + return 0; /*color type that isn't supported by this function yet, so assume there is transparency to be safe*/ +} + +#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS +static unsigned addUnknownChunks(ucvector* out, unsigned char* data, size_t datasize) +{ + unsigned char* inchunk = data; + while((size_t)(inchunk - data) < datasize) + { + unsigned error = LodePNG_append_chunk(&out->data, &out->size, inchunk); + if(error) return error; /*error: not enough memory*/ + out->allocsize = out->size; /*fix the allocsize again*/ + inchunk = LodePNG_chunk_next(inchunk); + } + return 0; +} +#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ + +void LodePNG_encode(LodePNG_Encoder* encoder, unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) +{ + LodePNG_InfoPng info; + ucvector outv; + unsigned char* data = 0; /*uncompressed version of the IDAT chunk data*/ + size_t datasize = 0; + + /*provide some proper output values if error will happen*/ + *out = 0; + *outsize = 0; + encoder->error = 0; + + info = encoder->infoPng; /*UNSAFE copy to avoid having to cleanup! but we will only change primitive parameters, and not invoke the cleanup function nor touch the palette's buffer so we use it safely*/ + info.width = w; + info.height = h; + + if(encoder->settings.autoLeaveOutAlphaChannel && isFullyOpaque(image, w, h, &encoder->infoRaw.color)) + { + /*go to a color type without alpha channel*/ + if(info.color.colorType == 6) info.color.colorType = 2; + else if(info.color.colorType == 4) info.color.colorType = 0; + } + + if(encoder->settings.zlibsettings.windowSize > 32768) { encoder->error = 60; return; } /*error: windowsize larger than allowed*/ + if(encoder->settings.zlibsettings.btype > 2) { encoder->error = 61; return; } /*error: unexisting btype*/ + if(encoder->infoPng.interlaceMethod > 1) { encoder->error = 71; return; } /*error: unexisting interlace mode*/ + if((encoder->error = checkColorValidity(info.color.colorType, info.color.bitDepth))) return; /*error: unexisting color type given*/ + if((encoder->error = checkColorValidity(encoder->infoRaw.color.colorType, encoder->infoRaw.color.bitDepth))) return; /*error: unexisting color type given*/ + + if(!LodePNG_InfoColor_equal(&encoder->infoRaw.color, &info.color)) + { + unsigned char* converted; + size_t size = (w * h * LodePNG_InfoColor_getBpp(&info.color) + 7) / 8; + + if((info.color.colorType != 6 && info.color.colorType != 2) || (info.color.bitDepth != 8)) { encoder->error = 59; return; } /*for the output image, only these types are supported*/ + converted = (unsigned char*)malloc(size); + if(!converted && size) encoder->error = 9955; /*error: malloc failed*/ + if(!encoder->error) encoder->error = LodePNG_convert(converted, image, &info.color, &encoder->infoRaw.color, w, h); + if(!encoder->error) preProcessScanlines(&data, &datasize, converted, &info);/*filter(data.data, converted.data, w, h, LodePNG_InfoColor_getBpp(&info.color));*/ + free(converted); + } + else preProcessScanlines(&data, &datasize, image, &info);/*filter(data.data, image, w, h, LodePNG_InfoColor_getBpp(&info.color));*/ + + ucvector_init(&outv); + while(!encoder->error) /*not really a while loop, this is only used to break out if an error happens to avoid goto's to do the ucvector cleanup*/ + { +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + size_t i; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + /*write signature and chunks*/ + writeSignature(&outv); + /*IHDR*/ + addChunk_IHDR(&outv, w, h, info.color.bitDepth, info.color.colorType, info.interlaceMethod); +#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS + /*unknown chunks between IHDR and PLTE*/ + if(info.unknown_chunks.data[0]) { encoder->error = addUnknownChunks(&outv, info.unknown_chunks.data[0], info.unknown_chunks.datasize[0]); if(encoder->error) break; } +#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ + /*PLTE*/ + if(info.color.colorType == 3) + { + if(info.color.palettesize == 0 || info.color.palettesize > 256) { encoder->error = 68; break; } + addChunk_PLTE(&outv, &info.color); + } + if(encoder->settings.force_palette && (info.color.colorType == 2 || info.color.colorType == 6)) + { + if(info.color.palettesize == 0 || info.color.palettesize > 256) { encoder->error = 68; break; } + addChunk_PLTE(&outv, &info.color); + } + /*tRNS*/ + if(info.color.colorType == 3 && !isPaletteFullyOpaque(info.color.palette, info.color.palettesize)) addChunk_tRNS(&outv, &info.color); + if((info.color.colorType == 0 || info.color.colorType == 2) && info.color.key_defined) addChunk_tRNS(&outv, &info.color); +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /*bKGD (must come between PLTE and the IDAt chunks*/ + if(info.background_defined) addChunk_bKGD(&outv, &info); + /*pHYs (must come before the IDAT chunks)*/ + if(info.phys_defined) addChunk_pHYs(&outv, &info); +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS + /*unknown chunks between PLTE and IDAT*/ + if(info.unknown_chunks.data[1]) { encoder->error = addUnknownChunks(&outv, info.unknown_chunks.data[1], info.unknown_chunks.datasize[1]); if(encoder->error) break; } +#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ + /*IDAT (multiple IDAT chunks must be consecutive)*/ + encoder->error = addChunk_IDAT(&outv, data, datasize, &encoder->settings.zlibsettings); + if(encoder->error) break; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /*tIME*/ + if(info.time_defined) addChunk_tIME(&outv, &info.time); + /*tEXt and/or zTXt*/ + for(i = 0; i < info.text.num; i++) + { + if(strlen(info.text.keys[i]) > 79) { encoder->error = 66; break; } + if(strlen(info.text.keys[i]) < 1) { encoder->error = 67; break; } + if(encoder->settings.text_compression) + addChunk_zTXt(&outv, info.text.keys[i], info.text.strings[i], &encoder->settings.zlibsettings); + else + addChunk_tEXt(&outv, info.text.keys[i], info.text.strings[i]); + } + /*LodePNG version id in text chunk*/ + if(encoder->settings.add_id) + { + unsigned alread_added_id_text = 0; + for(i = 0; i < info.text.num; i++) + if(!strcmp(info.text.keys[i], "LodePNG")) { alread_added_id_text = 1; break; } + if(alread_added_id_text == 0) + addChunk_tEXt(&outv, "LodePNG", VERSION_STRING); /*it's shorter as tEXt than as zTXt chunk*/ + } + /*iTXt*/ + for(i = 0; i < info.itext.num; i++) + { + if(strlen(info.itext.keys[i]) > 79) { encoder->error = 66; break; } + if(strlen(info.itext.keys[i]) < 1) { encoder->error = 67; break; } + addChunk_iTXt(&outv, encoder->settings.text_compression, + info.itext.keys[i], info.itext.langtags[i], info.itext.transkeys[i], info.itext.strings[i], + &encoder->settings.zlibsettings); + } +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS + /*unknown chunks between IDAT and IEND*/ + if(info.unknown_chunks.data[2]) { encoder->error = addUnknownChunks(&outv, info.unknown_chunks.data[2], info.unknown_chunks.datasize[2]); if(encoder->error) break; } +#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ + /*IEND*/ + addChunk_IEND(&outv); + + break; /*this isn't really a while loop; no error happened so break out now!*/ + } + + free(data); + /*instead of cleaning the vector up, give it to the output*/ + *out = outv.data; + *outsize = outv.size; +} + +unsigned LodePNG_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) +{ + unsigned error; + LodePNG_Encoder encoder; + LodePNG_Encoder_init(&encoder); + LodePNG_encode(&encoder, out, outsize, image, w, h); + error = encoder.error; + LodePNG_Encoder_cleanup(&encoder); + return error; +} + +#ifdef LODEPNG_COMPILE_DISK +unsigned LodePNG_encode32f(const char* filename, const unsigned char* image, unsigned w, unsigned h) +{ + unsigned char* buffer; + size_t buffersize; + unsigned error = LodePNG_encode32(&buffer, &buffersize, image, w, h); + LodePNG_saveFile(buffer, buffersize, filename); + free(buffer); + return error; +} +#endif /*LODEPNG_COMPILE_DISK*/ + +void LodePNG_EncodeSettings_init(LodePNG_EncodeSettings* settings) +{ + LodeZlib_DeflateSettings_init(&settings->zlibsettings); + settings->autoLeaveOutAlphaChannel = 1; + settings->force_palette = 0; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + settings->add_id = 1; + settings->text_compression = 0; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +} + +void LodePNG_Encoder_init(LodePNG_Encoder* encoder) +{ + LodePNG_EncodeSettings_init(&encoder->settings); + LodePNG_InfoPng_init(&encoder->infoPng); + LodePNG_InfoRaw_init(&encoder->infoRaw); + encoder->error = 1; +} + +void LodePNG_Encoder_cleanup(LodePNG_Encoder* encoder) +{ + LodePNG_InfoPng_cleanup(&encoder->infoPng); + LodePNG_InfoRaw_cleanup(&encoder->infoRaw); +} + +void LodePNG_Encoder_copy(LodePNG_Encoder* dest, const LodePNG_Encoder* source) +{ + LodePNG_Encoder_cleanup(dest); + *dest = *source; + LodePNG_InfoPng_init(&dest->infoPng); + LodePNG_InfoRaw_init(&dest->infoRaw); + dest->error = LodePNG_InfoPng_copy(&dest->infoPng, &source->infoPng); if(dest->error) return; + dest->error = LodePNG_InfoRaw_copy(&dest->infoRaw, &source->infoRaw); if(dest->error) return; +} + +#endif /*LODEPNG_COMPILE_ENCODER*/ + +#endif /*LODEPNG_COMPILE_PNG*/ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / File IO / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_DISK + +unsigned LodePNG_loadFile(unsigned char** out, size_t* outsize, const char* filename) /*designed for loading files from hard disk in a dynamically allocated buffer*/ +{ + FILE* file; + long size; + + /*provide some proper output values if error will happen*/ + *out = 0; + *outsize = 0; + + file = fopen(filename, "rb"); + if(!file) return 78; + + /*get filesize:*/ + fseek(file , 0 , SEEK_END); + size = ftell(file); + rewind(file); + + /*read contents of the file into the vector*/ + *outsize = 0; + *out = (unsigned char*)malloc((size_t)size); + if(size && (*out)) (*outsize) = fread(*out, 1, (size_t)size, file); + + fclose(file); + if(!(*out) && size) return 80; /*the above malloc failed*/ + return 0; +} + +/*write given buffer to the file, overwriting the file, it doesn't append to it.*/ +unsigned LodePNG_saveFile(const unsigned char* buffer, size_t buffersize, const char* filename) +{ + FILE* file; + file = fopen(filename, "wb" ); + if(!file) return 79; + fwrite((char*)buffer , 1 , buffersize, file); + fclose(file); + return 0; +} + +#endif /*LODEPNG_COMPILE_DISK*/ + +#ifdef __cplusplus +/* ////////////////////////////////////////////////////////////////////////// */ +/* / C++ RAII wrapper / */ +/* ////////////////////////////////////////////////////////////////////////// */ +namespace LodeZlib +{ + unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, const LodeZlib_DecompressSettings& settings) + { + unsigned char* buffer = 0; + size_t buffersize = 0; + unsigned error = LodeZlib_decompress(&buffer, &buffersize, in.empty() ? 0 : &in[0], in.size(), &settings); + if(buffer) + { + out.insert(out.end(), &buffer[0], &buffer[buffersize]); + free(buffer); + } + return error; + } + + unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, const LodeZlib_DeflateSettings& settings) + { + unsigned char* buffer = 0; + size_t buffersize = 0; + unsigned error = LodeZlib_compress(&buffer, &buffersize, in.empty() ? 0 : &in[0], in.size(), &settings); + if(buffer) + { + out.insert(out.end(), &buffer[0], &buffer[buffersize]); + free(buffer); + } + return error; + } +} + +namespace LodePNG +{ + Decoder::Decoder() { LodePNG_Decoder_init(this); } + Decoder::~Decoder() { LodePNG_Decoder_cleanup(this); } + void Decoder::operator=(const LodePNG_Decoder& other) { LodePNG_Decoder_copy(this, &other); } + + bool Decoder::hasError() const { return error != 0; } + unsigned Decoder::getError() const { return error; } + + unsigned Decoder::getWidth() const { return infoPng.width; } + unsigned Decoder::getHeight() const { return infoPng.height; } + unsigned Decoder::getBpp() { return LodePNG_InfoColor_getBpp(&infoPng.color); } + unsigned Decoder::getChannels() { return LodePNG_InfoColor_getChannels(&infoPng.color); } + unsigned Decoder::isGreyscaleType() { return LodePNG_InfoColor_isGreyscaleType(&infoPng.color); } + unsigned Decoder::isAlphaType() { return LodePNG_InfoColor_isAlphaType(&infoPng.color); } + + void Decoder::decode(std::vector<unsigned char>& out, const unsigned char* in, size_t insize) + { + unsigned char* buffer; + size_t buffersize; + LodePNG_decode(this, &buffer, &buffersize, in, insize); + if(buffer) + { + out.insert(out.end(), &buffer[0], &buffer[buffersize]); + free(buffer); + } + } + + void Decoder::decode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in) + { + decode(out, in.empty() ? 0 : &in[0], in.size()); + } + + void Decoder::inspect(const unsigned char* in, size_t size) + { + LodePNG_inspect(this, in, size); + } + + void Decoder::inspect(const std::vector<unsigned char>& in) + { + inspect(in.empty() ? 0 : &in[0], in.size()); + } + + const LodePNG_DecodeSettings& Decoder::getSettings() const { return settings; } + LodePNG_DecodeSettings& Decoder::getSettings() { return settings; } + void Decoder::setSettings(const LodePNG_DecodeSettings& settings) { this->settings = settings; } + + const LodePNG_InfoPng& Decoder::getInfoPng() const { return infoPng; } + LodePNG_InfoPng& Decoder::getInfoPng() { return infoPng; } + void Decoder::setInfoPng(const LodePNG_InfoPng& info) { error = LodePNG_InfoPng_copy(&this->infoPng, &info); } + void Decoder::swapInfoPng(LodePNG_InfoPng& info) { LodePNG_InfoPng_swap(&this->infoPng, &info); } + + const LodePNG_InfoRaw& Decoder::getInfoRaw() const { return infoRaw; } + LodePNG_InfoRaw& Decoder::getInfoRaw() { return infoRaw; } + void Decoder::setInfoRaw(const LodePNG_InfoRaw& info) { error = LodePNG_InfoRaw_copy(&this->infoRaw, &info); } + + /* ////////////////////////////////////////////////////////////////////////// */ + + Encoder::Encoder() { LodePNG_Encoder_init(this); } + Encoder::~Encoder() { LodePNG_Encoder_cleanup(this); } + void Encoder::operator=(const LodePNG_Encoder& other) { LodePNG_Encoder_copy(this, &other); } + + bool Encoder::hasError() const { return error != 0; } + unsigned Encoder::getError() const { return error; } + + void Encoder::encode(std::vector<unsigned char>& out, const unsigned char* image, unsigned w, unsigned h) + { + unsigned char* buffer; + size_t buffersize; + LodePNG_encode(this, &buffer, &buffersize, image, w, h); + if(buffer) + { + out.insert(out.end(), &buffer[0], &buffer[buffersize]); + free(buffer); + } + } + + void Encoder::encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& image, unsigned w, unsigned h) + { + encode(out, image.empty() ? 0 : &image[0], w, h); + } + + void Encoder::clearPalette() { LodePNG_InfoColor_clearPalette(&infoPng.color); } + void Encoder::addPalette(unsigned char r, unsigned char g, unsigned char b, unsigned char a) { error = LodePNG_InfoColor_addPalette(&infoPng.color, r, g, b, a); } +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + void Encoder::clearText() { LodePNG_Text_clear(&infoPng.text); } + void Encoder::addText(const std::string& key, const std::string& str) { error = LodePNG_Text_add(&infoPng.text, key.c_str(), str.c_str()); } + void Encoder::clearIText() { LodePNG_IText_clear(&infoPng.itext); } + void Encoder::addIText(const std::string& key, const std::string& langtag, const std::string& transkey, const std::string& str) { error = LodePNG_IText_add(&infoPng.itext, key.c_str(), langtag.c_str(), transkey.c_str(), str.c_str()); } +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + + const LodePNG_EncodeSettings& Encoder::getSettings() const { return settings; } + LodePNG_EncodeSettings& Encoder::getSettings() { return settings; } + void Encoder::setSettings(const LodePNG_EncodeSettings& settings) { this->settings = settings; } + + const LodePNG_InfoPng& Encoder::getInfoPng() const { return infoPng; } + LodePNG_InfoPng& Encoder::getInfoPng() { return infoPng; } + void Encoder::setInfoPng(const LodePNG_InfoPng& info) { error = LodePNG_InfoPng_copy(&this->infoPng, &info); } + void Encoder::swapInfoPng(LodePNG_InfoPng& info) { LodePNG_InfoPng_swap(&this->infoPng, &info); } + + const LodePNG_InfoRaw& Encoder::getInfoRaw() const { return infoRaw; } + LodePNG_InfoRaw& Encoder::getInfoRaw() { return infoRaw; } + void Encoder::setInfoRaw(const LodePNG_InfoRaw& info) { error = LodePNG_InfoRaw_copy(&this->infoRaw, &info); } + + /* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_DISK + + void loadFile(std::vector<unsigned char>& buffer, const std::string& filename) //designed for loading files from hard disk in an std::vector + { + std::ifstream file(filename.c_str(), std::ios::in|std::ios::binary|std::ios::ate); + + /*get filesize*/ + std::streamsize size = 0; + if(file.seekg(0, std::ios::end).good()) size = file.tellg(); + if(file.seekg(0, std::ios::beg).good()) size -= file.tellg(); + + /*read contents of the file into the vector*/ + buffer.resize(size_t(size)); + if(size > 0) file.read((char*)(&buffer[0]), size); + } + + /*write given buffer to the file, overwriting the file, it doesn't append to it.*/ + void saveFile(const std::vector<unsigned char>& buffer, const std::string& filename) + { + std::ofstream file(filename.c_str(), std::ios::out|std::ios::binary); + file.write(buffer.empty() ? 0 : (char*)&buffer[0], std::streamsize(buffer.size())); + } + +#endif /*LODEPNG_COMPILE_DISK*/ + + /* ////////////////////////////////////////////////////////////////////////// */ + + unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const unsigned char* in, unsigned size, unsigned colorType, unsigned bitDepth) + { + Decoder decoder; + decoder.getInfoRaw().color.colorType = colorType; + decoder.getInfoRaw().color.bitDepth = bitDepth; + decoder.decode(out, in, size); + w = decoder.getWidth(); + h = decoder.getHeight(); + return decoder.getError(); + } + + unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::vector<unsigned char>& in, unsigned colorType, unsigned bitDepth) + { + return decode(out, w, h, in.empty() ? 0 : &in[0], (unsigned)in.size(), colorType, bitDepth); + } + +#ifdef LODEPNG_COMPILE_DISK + unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::string& filename, unsigned colorType, unsigned bitDepth) + { + std::vector<unsigned char> buffer; + loadFile(buffer, filename); + return decode(out, w, h, buffer, colorType, bitDepth); + } +#endif /*LODEPNG_COMPILE_DISK*/ + + unsigned encode(std::vector<unsigned char>& out, const unsigned char* in, unsigned w, unsigned h, unsigned colorType, unsigned bitDepth) + { + Encoder encoder; + encoder.getInfoRaw().color.colorType = colorType; + encoder.getInfoRaw().color.bitDepth = bitDepth; + encoder.encode(out, in, w, h); + return encoder.getError(); + } + + unsigned encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, unsigned w, unsigned h, unsigned colorType, unsigned bitDepth) + { + return encode(out, in.empty() ? 0 : &in[0], w, h, colorType, bitDepth); + } + +#ifdef LODEPNG_COMPILE_DISK + unsigned encode(const std::string& filename, const unsigned char* in, unsigned w, unsigned h, unsigned colorType, unsigned bitDepth) + { + std::vector<unsigned char> buffer; + Encoder encoder; + encoder.getInfoRaw().color.colorType = colorType; + encoder.getInfoRaw().color.bitDepth = bitDepth; + encoder.encode(buffer, in, w, h); + if(!encoder.hasError()) saveFile(buffer, filename); + return encoder.getError(); + } + + unsigned encode(const std::string& filename, const std::vector<unsigned char>& in, unsigned w, unsigned h, unsigned colorType, unsigned bitDepth) + { + return encode(filename, in.empty() ? 0 : &in[0], w, h, colorType, bitDepth); + } +#endif /*LODEPNG_COMPILE_DISK*/ + +} +#endif /*__cplusplus C++ RAII wrapper*/ diff --git a/src/svg/lodepng.h b/src/svg/lodepng.h new file mode 100644 index 0000000..530c9ab --- /dev/null +++ b/src/svg/lodepng.h @@ -0,0 +1,1708 @@ +/* +LodePNG version 20080927 + +Copyright (c) 2005-2008 Lode Vandevenne + +This software is provided 'as-is', without any express or implied +warranty. In no event will the authors be held liable for any damages +arising from the use of this software. + +Permission is granted to anyone to use this software for any purpose, +including commercial applications, and to alter it and redistribute it +freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + + 3. This notice may not be removed or altered from any source + distribution. +*/ + +#ifndef LODEPNG_H +#define LODEPNG_H + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +/* ////////////////////////////////////////////////////////////////////////// */ +/* Code Sections */ +/* ////////////////////////////////////////////////////////////////////////// */ + +/*The following defines can be commented disable code sections. Gives potential faster compile and smaller binary.*/ + +#define LODEPNG_COMPILE_ZLIB /*deflate&zlib encoder and deflate&zlib decoder*/ +#define LODEPNG_COMPILE_PNG /*png encoder and png decoder*/ +#define LODEPNG_COMPILE_DECODER /*deflate&zlib decoder and png decoder*/ +#define LODEPNG_COMPILE_ENCODER /*deflate&zlib encoder and png encoder*/ +#define LODEPNG_COMPILE_DISK /*the optional built in harddisk file loading and saving functions*/ +#define LODEPNG_COMPILE_ANCILLARY_CHUNKS /*any code or struct datamember related to chunks other than IHDR, IDAT, PLTE, tRNS, IEND*/ +#define LODEPNG_COMPILE_UNKNOWN_CHUNKS /*handling of unknown chunks*/ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* LodeFlate & LodeZlib Setting structs */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_DECODER +typedef struct LodeZlib_DecompressSettings +{ + unsigned ignoreAdler32; +} LodeZlib_DecompressSettings; + +extern const LodeZlib_DecompressSettings LodeZlib_defaultDecompressSettings; +void LodeZlib_DecompressSettings_init(LodeZlib_DecompressSettings* settings); +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER +typedef struct LodeZlib_DeflateSettings /*deflate = compress*/ +{ + /*LZ77 related settings*/ + unsigned btype; /*the block type for LZ*/ + unsigned useLZ77; /*whether or not to use LZ77*/ + unsigned windowSize; /*the maximum is 32768*/ +} LodeZlib_DeflateSettings; + +extern const LodeZlib_DeflateSettings LodeZlib_defaultDeflateSettings; +void LodeZlib_DeflateSettings_init(LodeZlib_DeflateSettings* settings); +#endif /*LODEPNG_COMPILE_ENCODER*/ + +#ifdef LODEPNG_COMPILE_ZLIB +/* ////////////////////////////////////////////////////////////////////////// */ +/* LodeFlate & LodeZlib */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_DECODER +/*This function reallocates the out buffer and appends the data. +Either, *out must be NULL and *outsize must be 0, or, *out must be a valid buffer and *outsize its size in bytes.*/ +unsigned LodeZlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, const LodeZlib_DecompressSettings* settings); +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER +/*This function reallocates the out buffer and appends the data. +Either, *out must be NULL and *outsize must be 0, or, *out must be a valid buffer and *outsize its size in bytes.*/ +unsigned LodeZlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, const LodeZlib_DeflateSettings* settings); +#endif /*LODEPNG_COMPILE_ENCODER*/ +#endif /*LODEPNG_COMPILE_ZLIB*/ + +#ifdef LODEPNG_COMPILE_PNG + +/* ////////////////////////////////////////////////////////////////////////// */ +/* LodePNG */ +/* ////////////////////////////////////////////////////////////////////////// */ + +/*LodePNG_chunk functions: These functions need as input a large enough amount of allocated memory.*/ + +unsigned LodePNG_chunk_length(const unsigned char* chunk); /*get the length of the data of the chunk. Total chunk length has 12 bytes more.*/ + +void LodePNG_chunk_type(char type[5], const unsigned char* chunk); /*puts the 4-byte type in null terminated string*/ +unsigned char LodePNG_chunk_type_equals(const unsigned char* chunk, const char* type); /*check if the type is the given type*/ + +/*properties of PNG chunks gotten from capitalization of chunk type name, as defined by the standard*/ +unsigned char LodePNG_chunk_critical(const unsigned char* chunk); /*0: ancillary chunk, 1: it's one of the critical chunk types*/ +unsigned char LodePNG_chunk_private(const unsigned char* chunk); /*0: public, 1: private*/ +unsigned char LodePNG_chunk_safetocopy(const unsigned char* chunk); /*0: the chunk is unsafe to copy, 1: the chunk is safe to copy*/ + +unsigned char* LodePNG_chunk_data(unsigned char* chunk); /*get pointer to the data of the chunk*/ +const unsigned char* LodePNG_chunk_data_const(const unsigned char* chunk); /*get pointer to the data of the chunk*/ + +unsigned LodePNG_chunk_check_crc(const unsigned char* chunk); /*returns 0 if the crc is correct, 1 if it's incorrect*/ +void LodePNG_chunk_generate_crc(unsigned char* chunk); /*generates the correct CRC from the data and puts it in the last 4 bytes of the chunk*/ + +/*iterate to next chunks.*/ +unsigned char* LodePNG_chunk_next(unsigned char* chunk); +const unsigned char* LodePNG_chunk_next_const(const unsigned char* chunk); + +/*add chunks to out buffer. It reallocs the buffer to append the data. returns error code*/ +unsigned LodePNG_append_chunk(unsigned char** out, size_t* outlength, const unsigned char* chunk); /*appends chunk that was already created, to the data. Returns pointer to start of appended chunk, or NULL if error happened*/ +unsigned LodePNG_create_chunk(unsigned char** out, size_t* outlength, unsigned length, const char* type, const unsigned char* data); /*appends new chunk to out. Returns pointer to start of appended chunk, or NULL if error happened; may change memory address of out buffer*/ + +typedef struct LodePNG_InfoColor /*info about the color type of an image*/ +{ + /*header (IHDR)*/ + unsigned colorType; /*color type*/ + unsigned bitDepth; /*bits per sample*/ + + /*palette (PLTE)*/ + unsigned char* palette; /*palette in RGBARGBA... order*/ + size_t palettesize; /*palette size in number of colors (amount of bytes is 4 * palettesize)*/ + + /*transparent color key (tRNS)*/ + unsigned key_defined; /*is a transparent color key given?*/ + unsigned key_r; /*red component of color key*/ + unsigned key_g; /*green component of color key*/ + unsigned key_b; /*blue component of color key*/ +} LodePNG_InfoColor; + +void LodePNG_InfoColor_init(LodePNG_InfoColor* info); +void LodePNG_InfoColor_cleanup(LodePNG_InfoColor* info); +unsigned LodePNG_InfoColor_copy(LodePNG_InfoColor* dest, const LodePNG_InfoColor* source); + +/*Use these functions instead of allocating palette manually*/ +void LodePNG_InfoColor_clearPalette(LodePNG_InfoColor* info); +unsigned LodePNG_InfoColor_addPalette(LodePNG_InfoColor* info, unsigned char r, unsigned char g, unsigned char b, unsigned char a); /*add 1 color to the palette*/ + +/*additional color info*/ +unsigned LodePNG_InfoColor_getBpp(const LodePNG_InfoColor* info); /*bits per pixel*/ +unsigned LodePNG_InfoColor_getChannels(const LodePNG_InfoColor* info); /*amount of channels*/ +unsigned LodePNG_InfoColor_isGreyscaleType(const LodePNG_InfoColor* info); /*is it a greyscale type? (colorType 0 or 4)*/ +unsigned LodePNG_InfoColor_isAlphaType(const LodePNG_InfoColor* info); /*has it an alpha channel? (colorType 2 or 6)*/ + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS +typedef struct LodePNG_Time /*LodePNG's encoder does not generate the current time. To make it add a time chunk the correct time has to be provided*/ +{ + unsigned year; /*2 bytes*/ + unsigned char month; /*1-12*/ + unsigned char day; /*1-31*/ + unsigned char hour; /*0-23*/ + unsigned char minute; /*0-59*/ + unsigned char second; /*0-60 (to allow for leap seconds)*/ +} LodePNG_Time; + +typedef struct LodePNG_Text /*non-international text*/ +{ + size_t num; + char** keys; /*the keyword of a text chunk (e.g. "Comment")*/ + char** strings; /*the actual text*/ +} LodePNG_Text; + +void LodePNG_Text_init(LodePNG_Text* text); +void LodePNG_Text_cleanup(LodePNG_Text* text); +unsigned LodePNG_Text_copy(LodePNG_Text* dest, const LodePNG_Text* source); + +/*Use these functions instead of allocating the char**s manually*/ +void LodePNG_Text_clear(LodePNG_Text* text); +unsigned LodePNG_Text_add(LodePNG_Text* text, const char* key, const char* str); /*push back both texts at once*/ + + +typedef struct LodePNG_IText /*international text*/ +{ + size_t num; + char** keys; /*the English keyword of the text chunk (e.g. "Comment")*/ + char** langtags; /*the language tag for this text's international language, ISO/IEC 646 string, e.g. ISO 639 language tag*/ + char** transkeys; /*keyword translated to the international language - UTF-8 string*/ + char** strings; /*the actual international text - UTF-8 string*/ +} LodePNG_IText; + +void LodePNG_IText_init(LodePNG_IText* text); +void LodePNG_IText_cleanup(LodePNG_IText* text); +unsigned LodePNG_IText_copy(LodePNG_IText* dest, const LodePNG_IText* source); + +/*Use these functions instead of allocating the char**s manually*/ +void LodePNG_IText_clear(LodePNG_IText* text); +unsigned LodePNG_IText_add(LodePNG_IText* text, const char* key, const char* langtag, const char* transkey, const char* str); /*push back the 4 texts of 1 chunk at once*/ +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS +typedef struct LodePNG_UnknownChunks /*unknown chunks read from the PNG, or extra chunks the user wants to have added in the encoded PNG*/ +{ + /*There are 3 buffers, one for each position in the PNG where unknown chunks can appear + each buffer contains all unknown chunks for that position consecutively + The 3 buffers are the unknown chunks between certain critical chunks: + 0: IHDR-PLTE, 1: PLTE-IDAT, 2: IDAT-IEND*/ + unsigned char* data[3]; + size_t datasize[3]; /*size in bytes of the unknown chunks, given for protection*/ + +} LodePNG_UnknownChunks; + +void LodePNG_UnknownChunks_init(LodePNG_UnknownChunks* chunks); +void LodePNG_UnknownChunks_cleanup(LodePNG_UnknownChunks* chunks); +unsigned LodePNG_UnknownChunks_copy(LodePNG_UnknownChunks* dest, const LodePNG_UnknownChunks* src); +#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ + +typedef struct LodePNG_InfoPng /*information about the PNG image, except pixels and sometimes except width and height*/ +{ + /*header (IHDR), palette (PLTE) and transparency (tRNS)*/ + unsigned width; /*width of the image in pixels (ignored by encoder, but filled in by decoder)*/ + unsigned height; /*height of the image in pixels (ignored by encoder, but filled in by decoder)*/ + unsigned compressionMethod; /*compression method of the original file*/ + unsigned filterMethod; /*filter method of the original file*/ + unsigned interlaceMethod; /*interlace method of the original file*/ + LodePNG_InfoColor color; /*color type and bits, palette, transparency*/ + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + + /*suggested background color (bKGD)*/ + unsigned background_defined; /*is a suggested background color given?*/ + unsigned background_r; /*red component of suggested background color*/ + unsigned background_g; /*green component of suggested background color*/ + unsigned background_b; /*blue component of suggested background color*/ + + /*non-international text chunks (tEXt and zTXt)*/ + LodePNG_Text text; + + /*international text chunks (iTXt)*/ + LodePNG_IText itext; + + /*time chunk (tIME)*/ + unsigned char time_defined; /*if 0, no tIME chunk was or will be generated in the PNG image*/ + LodePNG_Time time; + + /*phys chunk (pHYs)*/ + unsigned phys_defined; /*is pHYs chunk defined?*/ + unsigned phys_x; + unsigned phys_y; + unsigned char phys_unit; /*may be 0 (unknown unit) or 1 (metre)*/ + +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS + /*unknown chunks*/ + LodePNG_UnknownChunks unknown_chunks; +#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ + +} LodePNG_InfoPng; + +void LodePNG_InfoPng_init(LodePNG_InfoPng* info); +void LodePNG_InfoPng_cleanup(LodePNG_InfoPng* info); +unsigned LodePNG_InfoPng_copy(LodePNG_InfoPng* dest, const LodePNG_InfoPng* source); + +typedef struct LodePNG_InfoRaw /*contains user-chosen information about the raw image data, which is independent of the PNG image*/ +{ + LodePNG_InfoColor color; +} LodePNG_InfoRaw; + +void LodePNG_InfoRaw_init(LodePNG_InfoRaw* info); +void LodePNG_InfoRaw_cleanup(LodePNG_InfoRaw* info); +unsigned LodePNG_InfoRaw_copy(LodePNG_InfoRaw* dest, const LodePNG_InfoRaw* source); + +/* +LodePNG_convert: Converts from any color type to 24-bit or 32-bit (later maybe more supported). return value = LodePNG error code +The out buffer must have (w * h * bpp + 7) / 8, where bpp is the bits per pixel of the output color type (LodePNG_InfoColor_getBpp) +*/ +unsigned LodePNG_convert(unsigned char* out, const unsigned char* in, LodePNG_InfoColor* infoOut, LodePNG_InfoColor* infoIn, unsigned w, unsigned h); + +#ifdef LODEPNG_COMPILE_DECODER + +typedef struct LodePNG_DecodeSettings +{ + LodeZlib_DecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/ + + unsigned ignoreCrc; /*ignore CRC checksums*/ + unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/ + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + unsigned readTextChunks; /*if false but rememberUnknownChunks is true, they're stored in the unknown chunks*/ +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS + unsigned rememberUnknownChunks; /*store all bytes from unknown chunks in the InfoPng (off by default, useful for a png editor)*/ +#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ +} LodePNG_DecodeSettings; + +void LodePNG_DecodeSettings_init(LodePNG_DecodeSettings* settings); + +typedef struct LodePNG_Decoder +{ + LodePNG_DecodeSettings settings; + LodePNG_InfoRaw infoRaw; + LodePNG_InfoPng infoPng; /*info of the PNG image obtained after decoding*/ + unsigned error; +} LodePNG_Decoder; + +void LodePNG_Decoder_init(LodePNG_Decoder* decoder); +void LodePNG_Decoder_cleanup(LodePNG_Decoder* decoder); +void LodePNG_Decoder_copy(LodePNG_Decoder* dest, const LodePNG_Decoder* source); + +/*decoding functions*/ +/*This function allocates the out buffer and stores the size in *outsize.*/ +void LodePNG_decode(LodePNG_Decoder* decoder, unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize); +unsigned LodePNG_decode32(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize); /*return value is error*/ +#ifdef LODEPNG_COMPILE_DISK +unsigned LodePNG_decode32f(unsigned char** out, unsigned* w, unsigned* h, const char* filename); +#endif /*LODEPNG_COMPILE_DISK*/ +void LodePNG_inspect(LodePNG_Decoder* decoder, const unsigned char* in, size_t size); /*read the png header*/ + +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER + +typedef struct LodePNG_EncodeSettings +{ + LodeZlib_DeflateSettings zlibsettings; /*settings for the zlib encoder, such as window size, ...*/ + + unsigned autoLeaveOutAlphaChannel; /*automatically use color type without alpha instead of given one, if given image is opaque*/ + unsigned force_palette; /*force creating a PLTE chunk if colortype is 2 or 6 (= a suggested palette). If colortype is 3, PLTE is _always_ created.*/ +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + unsigned add_id; /*add LodePNG version as text chunk*/ + unsigned text_compression; /*encode text chunks as zTXt chunks instead of tEXt chunks, and use compression in iTXt chunks*/ +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +} LodePNG_EncodeSettings; + +void LodePNG_EncodeSettings_init(LodePNG_EncodeSettings* settings); + +typedef struct LodePNG_Encoder +{ + LodePNG_EncodeSettings settings; + LodePNG_InfoPng infoPng; /*the info specified by the user may not be changed by the encoder. The encoder will try to generate a PNG close to the given info.*/ + LodePNG_InfoRaw infoRaw; /*put the properties of the input raw image in here*/ + unsigned error; +} LodePNG_Encoder; + +void LodePNG_Encoder_init(LodePNG_Encoder* encoder); +void LodePNG_Encoder_cleanup(LodePNG_Encoder* encoder); +void LodePNG_Encoder_copy(LodePNG_Encoder* dest, const LodePNG_Encoder* source); + +/*This function allocates the out buffer and stores the size in *outsize.*/ +void LodePNG_encode(LodePNG_Encoder* encoder, unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h); +unsigned LodePNG_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h); /*return value is error*/ +#ifdef LODEPNG_COMPILE_DISK +unsigned LodePNG_encode32f(const char* filename, const unsigned char* image, unsigned w, unsigned h); +#endif /*LODEPNG_COMPILE_DISK*/ +#endif /*LODEPNG_COMPILE_ENCODER*/ +#endif /*LODEPNG_COMPILE_PNG*/ + +#ifdef LODEPNG_COMPILE_DISK +/*free functions allowing to load and save a file from/to harddisk*/ +/*This function allocates the out buffer and stores the size in *outsize.*/ +unsigned LodePNG_loadFile(unsigned char** out, size_t* outsize, const char* filename); +unsigned LodePNG_saveFile(const unsigned char* buffer, size_t buffersize, const char* filename); +#endif /*LODEPNG_COMPILE_DISK*/ + +#ifdef __cplusplus + +//LodePNG C++ wrapper: wraps interface with destructors and std::vectors around the harder to use C version + +#include <vector> +#include <string> +#include <fstream> + +#ifdef LODEPNG_COMPILE_ZLIB +namespace LodeZlib +{ +#ifdef LODEPNG_COMPILE_DECODER + unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, const LodeZlib_DecompressSettings& settings = LodeZlib_defaultDecompressSettings); +#endif //LODEPNG_COMPILE_DECODER +#ifdef LODEPNG_COMPILE_ENCODER + unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, const LodeZlib_DeflateSettings& settings = LodeZlib_defaultDeflateSettings); +#endif //LODEPNG_COMPILE_ENCODER +} +#endif //LODEPNG_COMPILE_ZLIB + +#ifdef LODEPNG_COMPILE_PNG +namespace LodePNG +{ + +#ifdef LODEPNG_COMPILE_DECODER + class Decoder : public LodePNG_Decoder + { + public: + + Decoder(); + ~Decoder(); + void operator=(const LodePNG_Decoder& other); + + //decoding functions + void decode(std::vector<unsigned char>& out, const unsigned char* in, size_t insize); + void decode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in); + + void inspect(const unsigned char* in, size_t size); + void inspect(const std::vector<unsigned char>& in); + + //error checking after decoding + bool hasError() const; + unsigned getError() const; + + //convenient access to some InfoPng parameters after decoding + unsigned getWidth() const; + unsigned getHeight() const; + unsigned getBpp(); //bits per pixel + unsigned getChannels(); //amount of channels + unsigned isGreyscaleType(); //is it a greyscale type? (colorType 0 or 4) + unsigned isAlphaType(); //has it an alpha channel? (colorType 2 or 6) + + const LodePNG_DecodeSettings& getSettings() const; + LodePNG_DecodeSettings& getSettings(); + void setSettings(const LodePNG_DecodeSettings& info); + + const LodePNG_InfoPng& getInfoPng() const; + LodePNG_InfoPng& getInfoPng(); + void setInfoPng(const LodePNG_InfoPng& info); + void swapInfoPng(LodePNG_InfoPng& info); //faster than copying with setInfoPng + + const LodePNG_InfoRaw& getInfoRaw() const; + LodePNG_InfoRaw& getInfoRaw(); + void setInfoRaw(const LodePNG_InfoRaw& info); + }; + + //simple functions for encoding/decoding the PNG in one call (RAW image always 32-bit) + unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const unsigned char* in, unsigned size, unsigned colorType = 6, unsigned bitDepth = 8); + unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::vector<unsigned char>& in, unsigned colorType = 6, unsigned bitDepth = 8); +#ifdef LODEPNG_COMPILE_DISK + unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::string& filename, unsigned colorType = 6, unsigned bitDepth = 8); +#endif //LODEPNG_COMPILE_DISK +#endif //LODEPNG_COMPILE_DECODER + +#ifdef LODEPNG_COMPILE_ENCODER + class Encoder : public LodePNG_Encoder + { + public: + + Encoder(); + ~Encoder(); + void operator=(const LodePNG_Encoder& other); + + void encode(std::vector<unsigned char>& out, const unsigned char* image, unsigned w, unsigned h); + void encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& image, unsigned w, unsigned h); + + //error checking after decoding + bool hasError() const; + unsigned getError() const; + + //convenient direct access to some parameters of the InfoPng + void clearPalette(); + void addPalette(unsigned char r, unsigned char g, unsigned char b, unsigned char a); //add 1 color to the palette +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + void clearText(); + void addText(const std::string& key, const std::string& str); //push back both texts at once + void clearIText(); + void addIText(const std::string& key, const std::string& langtag, const std::string& transkey, const std::string& str); +#endif //LODEPNG_COMPILE_ANCILLARY_CHUNKS + + const LodePNG_EncodeSettings& getSettings() const; + LodePNG_EncodeSettings& getSettings(); + void setSettings(const LodePNG_EncodeSettings& info); + + const LodePNG_InfoPng& getInfoPng() const; + LodePNG_InfoPng& getInfoPng(); + void setInfoPng(const LodePNG_InfoPng& info); + void swapInfoPng(LodePNG_InfoPng& info); //faster than copying with setInfoPng + + const LodePNG_InfoRaw& getInfoRaw() const; + LodePNG_InfoRaw& getInfoRaw(); + void setInfoRaw(const LodePNG_InfoRaw& info); + }; + + unsigned encode(std::vector<unsigned char>& out, const unsigned char* in, unsigned w, unsigned h, unsigned colorType = 6, unsigned bitDepth = 8); + unsigned encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, unsigned w, unsigned h, unsigned colorType = 6, unsigned bitDepth = 8); +#ifdef LODEPNG_COMPILE_DISK + unsigned encode(const std::string& filename, const unsigned char* in, unsigned w, unsigned h, unsigned colorType = 6, unsigned bitDepth = 8); + unsigned encode(const std::string& filename, const std::vector<unsigned char>& in, unsigned w, unsigned h, unsigned colorType = 6, unsigned bitDepth = 8); +#endif //LODEPNG_COMPILE_DISK +#endif //LODEPNG_COMPILE_ENCODER + +#ifdef LODEPNG_COMPILE_DISK + //free functions allowing to load and save a file from/to harddisk + void loadFile(std::vector<unsigned char>& buffer, const std::string& filename); + void saveFile(const std::vector<unsigned char>& buffer, const std::string& filename); +#endif //LODEPNG_COMPILE_DISK + +} //namespace LodePNG + +#endif //LODEPNG_COMPILE_PNG + +#endif /*end of __cplusplus wrapper*/ + +/* +TODO: +[ ] test if there are no memory leaks or security exploits - done a lot but needs to be checked often +[ ] LZ77 encoder more like the one described in zlib - to make sure it's patentfree +[ ] converting color to 16-bit types +[ ] read all public PNG chunk types (but never let the color profile and gamma ones ever touch RGB values, that is very annoying for textures as well as images in a browser) +[ ] make sure encoder generates no chunks with size > (2^31)-1 +[ ] partial decoding (stream processing) +[ ] let the "isFullyOpaque" function check color keys and transparent palettes too +[ ] better name for the variables "codes", "codesD", "codelengthcodes", "clcl" and "lldl" +[ ] check compatibility with vareous compilers - done but needs to be redone for every newer version +[ ] don't stop decoding on errors like 69, 57, 58 (make warnings that the decoder stores in the error at the very end? and make some errors just let it stop with this one chunk but still do the next ones) +[ ] make option to choose if the raw image with non multiple of 8 bits per scanline should have padding bits or not, if people like storing raw images that way +*/ + +#endif + +/* +LodePNG Documentation +--------------------- + +0. table of contents +-------------------- + + 1. about + 1.1. supported features + 1.2. features not supported + 2. C and C++ version + 3. A note about security! + 4. simple functions + 4.1 C Simple Functions + 4.2 C++ Simple Functions + 5. decoder + 6. encoder + 7. color conversions + 8. info values + 9. error values + 10. file IO + 11. chunks and PNG editing + 12. compiler support + 13. examples + 13.1. decoder example + 13.2. encoder example + 14. LodeZlib + 15. changes + 16. contact information + + +1. about +-------- + +PNG is a file format to store raster images losslessly with good compression, +supporting different color types. It can be implemented in a patent-free way. + +LodePNG is a PNG codec according to the Portable Network Graphics (PNG) +Specification (Second Edition) - W3C Recommendation 10 November 2003. + +The specifications used are: + +*) Portable Network Graphics (PNG) Specification (Second Edition): + http://www.w3.org/TR/2003/REC-PNG-20031110 +*) RFC 1950 ZLIB Compressed Data Format version 3.3: + http://www.gzip.org/zlib/rfc-zlib.html +*) RFC 1951 DEFLATE Compressed Data Format Specification ver 1.3: + http://www.gzip.org/zlib/rfc-deflate.html + +The most recent version of LodePNG can currently be found at +http://members.gamedev.net/lode/projects/LodePNG/ + +LodePNG works both in C (ISO C90) and C++, with a C++ wrapper that adds +extra functionality. + +LodePNG exists out of two files: +-lodepng.h: the header file for both C and C++ +-lodepng.c(pp): give it the name lodepng.c or lodepng.cpp depending on your usage + +If you want to start using LodePNG right away without reading this doc, get the +files lodepng_examples.c or lodepng_examples.cpp to see how to use it in code, +or check the (smaller) examples in chapter 13 here. + +LodePNG is simple but only supports the basic requirements. To achieve +simplicity, the following design choices were made: There are no dependencies +on any external library. To decode PNGs, there's a Decoder struct or class that +can convert any PNG file data into an RGBA image buffer with a single function +call. To encode PNGs, there's an Encoder struct or class that can convert image +data into PNG file data with a single function call. To read and write files, +there are simple functions to convert the files to/from buffers in memory. + +This all makes LodePNG suitable for loading textures in games, demoscene +productions, saving a screenshot, images in programs that require them for simple +usage, ... It's less suitable for full fledged image editors, loading PNGs +over network (it requires all the image data to be available before decoding can +begin), life-critical systems, ... +LodePNG has a standards conformant decoder and encoder, and supports the ability +to make a somewhat conformant editor. + +1.1. supported features +----------------------- + +The following features are supported by the decoder: + +*) decoding of PNGs with any color type, bit depth and interlace mode, to a 24- or 32-bit color raw image, or the same color type as the PNG +*) encoding of PNGs, from any raw image to 24- or 32-bit color, or the same color type as the raw image +*) Adam7 interlace and deinterlace for any color type +*) loading the image from harddisk or decoding it from a buffer from other sources than harddisk +*) support for alpha channels, including RGBA color model, translucent palettes and color keying +*) zlib decompression (inflate) +*) zlib compression (deflate) +*) CRC32 and ADLER32 checksums +*) handling of unknown chunks, allowing making a PNG editor that stores custom and unknown chunks. +*) the following chunks are supported (generated/interpreted) by both encoder and decoder: + IHDR: header information + PLTE: color palette + IDAT: pixel data + IEND: the final chunk + tRNS: transparency for palettized images + tEXt: textual information + zTXt: compressed textual information + iTXt: international textual information + bKGD: suggested background color + pHYs: physical dimensions + tIME: modification time + +1.2. features not supported +--------------------------- + +The following features are _not_ supported: + +*) some features needed to make a conformant PNG-Editor might be still missing. +*) partial loading/stream processing. All data must be available and is processed in one call. +*) The following public chunks are not supported but treated as unknown chunks by LodePNG + cHRM, gAMA, iCCP, sRGB, sBIT, hIST, sPLT + + +2. C and C++ version +-------------------- + +The C version uses buffers allocated with alloc instead that you need to free() +yourself. On top of that, you need to use init and cleanup functions for each +struct whenever using a struct from the C version to avoid exploits and memory leaks. + +The C++ version has constructors and destructors that take care of these things, +and uses std::vectors in the interface for storing data. + +Both the C and the C++ version are contained in this file! The C++ code depends on +the C code, the C code works on its own. + +These files work without modification for both C and C++ compilers because all the +additional C++ code is in "#ifdef __cplusplus" blocks that make C-compilers ignore +it, and the C code is made to compile both with strict ISO C90 and C++. + +To use the C++ version, you need to rename the source file to lodepng.cpp (instead +of lodepng.c), and compile it with a C++ compiler. + +To use the C version, you need to rename the source file to lodepng.c (instead +of lodepng.cpp), and compile it with a C compiler. + + +3. A note about security! +------------------------- + +Despite being used already and having received bug fixes whenever bugs were reported, +LodePNG may still contain possible exploits. + +If you discover a possible exploit, please let me know, and it will be eliminated. + +When using LodePNG, care has to be taken with the C version of LodePNG, as well as the C-style +structs when working with C++. The following conventions are used for all C-style structs: + +-if a struct has a corresponding init function, always call the init function when making a new one, to avoid exploits +-if a struct has a corresponding cleanup function, call it before the struct disappears to avoid memory leaks +-if a struct has a corresponding copy function, use the copy function instead of "=". The destination must be inited already! + + +4. "Simple" Functions +--------------------- + +For the most simple usage cases of loading and saving a PNG image, there +are some simple functions that do everything in 1 call (instead of you +having to instantiate a struct or class). + +The simple versions always use 32-bit RGBA color for the raw image, but +still support loading arbitrary-colortype PNG images. + +The later sections of this manual are devoted to the complex versions, where +you can use other color types and conversions. + +4.1 C Simple Functions +---------------------- + +The C simple functions have a "32" or "32f" in their name, and don't take a struct as +parameter, unlike the non-simple ones (see more down in the documentation). + +unsigned LodePNG_decode32(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize); + +Load PNG from given buffer. +As input, give an unsigned char* buffer gotten by loading the .png file and its size. +As output, you get a dynamically allocated buffer of large enough size, and the width and height of the image. +The buffer's size is w * h * 4. The image is in RGBA format. +The return value is the error (0 if ok). +You need to do free(out) after usage to clean up the memory. + +unsigned LodePNG_decode32f(unsigned char** out, unsigned* w, unsigned* h, const char* filename); + +Load PNG from disk, from file with given name. +Same as decode32, except you give a filename instead of an input buffer. + +unsigned LodePNG_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h); + +Encode PNG into buffer. +As input, give a image buffer of size w * h * 4, in RGBA format. +As output, you get a dynamically allocated buffer and its size, which is a PNG file that can +directly be saved in this form to the harddisk. +The return value is the error (0 if ok). +You need to do free(out) after usage to clean up the memory. + +unsigned LodePNG_encode32f(const char* filename, const unsigned char* image, unsigned w, unsigned h); + +Encode PNG into file on disk with given name. +If the file exists, it's overwritten without warning! +Same parameters as encode2, except the result is stored in a file instead of a dynamic buffer. + +4.2 C++ Simple Functions +------------------------ + +For decoding a PNG there are: + +unsigned LodePNG::decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const unsigned char* in, unsigned size); +unsigned LodePNG::decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::vector<unsigned char>& in); +unsigned LodePNG::decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::string& filename); + +These store the pixel data as 32-bit RGBA color in the out vector, and the width +and height of the image in w and h. +The 3 functions each have a different input type: The first as unsigned char +buffer, the second as std::vector buffer, and the third allows you to give the +filename in case you want to load the PNG from disk instead of from a buffer. +The return value is the error (0 if ok). + +For encoding a PNG there are: + +unsigned LodePNG::encode(std::vector<unsigned char>& out, const unsigned char* in, unsigned w, unsigned h); +unsigned LodePNG::encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, unsigned w, unsigned h); +unsigned LodePNG::encode(const std::string& filename, const std::vector<unsigned char>& in, unsigned w, unsigned h); +unsigned LodePNG::encode(const std::string& filename, const unsigned char* in, unsigned w, unsigned h); + +Specify the width and height of the input image with w and h. +You can choose to get the output in an std::vector or stored in a file, and +the input can come from an std::vector or an unsigned char* buffer. The input +buffer must be in RGBA format and the size must be w * h * 4 bytes. + +The first two functions append to the out buffer, they don't clear it, clear it +first before encoding into a buffer that you expect to only contain this result. + +On the other hand, the functions that encode to a file will completely overwrite +the original file without warning if it exists. + +The return value is the error (0 if ok). + +5. Decoder +---------- + +This is about the LodePNG_Decoder struct in the C version, and the +LodePNG::Decoder class in the C++ version. The C++ version inherits +from the C struct and adds functions in the interface. + +The Decoder class can be used to convert a PNG image to a raw image. + +Usage: + +-in C++: + declare a LodePNG::Decoder + call its decode member function with the parameters described below + +-in C more needs to be done due to the lack of constructors and destructors: + declare a LodePNG_Decoder struct + call LodePNG_Decoder_init with the struct as parameter + call LodePNG_Decode with the parameters described below + after usage, call LodePNG_Decoder_cleanup with the struct as parameter + after usage, free() the out buffer with image data that was created by the decode function + +The other parameters of the decode function are: +*) out: this buffer will be filled with the raw image pixels +*) in: pointer to the PNG image data or std::vector with the data +*) size: the size of the PNG image data (not needed for std::vector version) + +After decoding you need to read the width and height of the image from the +decoder, see further down in this manual to see how. + +There's also an optional function "inspect". It has the same parameters as decode except +the "out" parameter. This function will read only the header chunk of the PNG +image, and store the information from it in the LodePNG_InfoPng (see below). +This allows knowing information about the image without decoding it. Only the +header (IHDR) information is read by this, not text chunks, not the palette, ... + +During the decoding it's possible that an error can happen, for example if the +PNG image was corrupted. To check if an error happened during the last decoding, +check the value error, which is a member of the decoder struct. +In the C++ version, use hasError() and getError() of the Decoder. +The error codes are explained in another section. + +Now about colors and settings... + +The Decoder contains 3 components: +*) LodePNG_InfoPng: it stores information about the PNG (the input) in an LodePNG_InfoPng struct, don't modify this one yourself +*) Settings: you can specify a few other settings for the decoder to use +*) LodePNG_InfoRaw: here you can say what type of raw image (the output) you want to get + +Some of the parameters described below may be inside the sub-struct "LodePNG_InfoColor color". +In the C and C++ version, when using Info structs outside of the decoder or encoder, you need to use their +init and cleanup functions, but normally you use the ones in the decoder that are already handled +in the init and cleanup functions of the decoder itself. + +=LodePNG_InfoPng= + +This contains information such as the original color type of the PNG image, text +comments, suggested background color, etc... More details about the LodePNG_InfoPng struct +are in another section. + +Because the dimensions of the image are important, there are shortcuts to get them in the +C++ version: use decoder.getWidth() and decoder.getHeight(). +In the C version, use decoder.infoPng.width and decoder.infoPng.height. + +=LodePNG_InfoRaw= + +In the LodePNG_InfoRaw struct of the Decoder, you can specify which color type you want +the resulting raw image to be. If this is different from the colorType of the +PNG, then the decoder will automatically convert the result to your LodePNG_InfoRaw +settings. Currently the following options are supported to convert to: +-colorType 6, bitDepth 8: 32-bit RGBA +-colorType 2, bitDepth 8: 24-bit RGB +-other color types if it's exactly the same as that in the PNG image + +Palette of LodePNG_InfoRaw isn't used by the Decoder, when converting from palette color +to palette color, the values of the pixels are left untouched so that the colors +will change if the palette is different. Color key of LodePNG_InfoRaw is not used by the +Decoder. If setting color_convert is false then LodePNG_InfoRaw is completely ignored, +but it will be modified to match the color type of the PNG so will be overwritten. + +By default, 32-bit color is used for the result. + +=Settings= + +The Settings can be used to ignore the errors created by invalid CRC and Adler32 +chunks, and to disable the decoding of tEXt chunks. + +There's also a setting color_convert, true by default. If false, no conversion +is done, the resulting data will be as it was in the PNG (after decompression) +and you'll have to puzzle the colors of the pixels together yourself using the +color type information in the LodePNG_InfoPng. + + +6. Encoder +---------- + +This is about the LodePNG_Encoder struct in the C version, and the +LodePNG::Encoder class in the C++ version. + +The Encoder class can be used to convert raw image data into a PNG image. + +The PNG part of the encoder is working good, the zlib compression part is +becoming quite fine but not as good as the official zlib yet, because it's not +as fast and doesn't provide an as high compression ratio. + +Usage: + +-in C++: + declare a LodePNG::Encoder + call its encode member function with the parameters described below + +-in C more needs to be done due to the lack of constructors and destructors: + declare a LodePNG_Encoder struct + call LodePNG_Encoder_init with the struct as parameter + call LodePNG_Encode with the parameters described below + after usage, call LodePNG_Encoder_cleanup with the struct as parameter + after usage, free() the out buffer with PNG data that was created by the encode function + +The raw image given to the encoder is an unsigned char* buffer. You also have to +specify the width and height of the raw image. The result is stored in a given +buffer. These buffers can be unsigned char* pointers, std::vectors or dynamically +allocated unsigned char* buffers that you have to free() yourself, depending on +which you use. + +The parameters of the encode function are: +*) out: in this buffer the PNG file data will be stored (it will be appended) +*) in: vector of or pointer to a buffer containing the raw image +*) w and h: the width and height of the raw image in pixels + +Make sure that the in buffer you provide, is big enough to contain w * h pixels +of the color type specified by the LodePNG_InfoRaw. + +In the C version, you need to free() the out buffer after usage to avoid memory leaks. +In the C version, you need to use the LodePNG_Encoder_init function before using the decoder, +and the LodePNG_Encoder_cleanup function after using it. +In the C++ version, you don't need to do this since RAII takes care of it. + +The encoder generates some errors but not for everything, because, unlike when +decoding a PNG, when encoding one there aren't so much parameters of the input +that can be corrupted. It's the responsibility of the user to make sure that all +preconditions are satesfied, such as giving a correct window size, giving an +existing btype, making sure the given buffer is large enough to contain an image +with the given width and height and colortype, ... The encoder can generate +some errors, see the section with the explanations of errors for those. + +Like the Decoder, the Encoder has 3 components: +*) LodePNG_InfoRaw: here you say what color type of the raw image (the input) has +*) Settings: you can specify a few settings for the encoder to use +*) LodePNG_InfoPng: the same LodePNG_InfoPng struct as created by the Decoder. For the encoder, +with this you specify how you want the PNG (the output) to be. + +Some of the parameters described below may be inside the sub-struct "LodePNG_InfoColor color". +In the C and C++ version, when using Info structs outside of the decoder or encoder, you need to use their +init and cleanup functions, but normally you use the ones in the encoder that are already handled +in the init and cleanup functions of the decoder itself. + +=LodePNG_InfoPng= + +The Decoder class stores information about the PNG image in an LodePNG_InfoPng object. With +the Encoder you can do the opposite: you give it an LodePNG_InfoPng object, and it'll try +to match the LodePNG_InfoPng you give as close as possible in the PNG it encodes. For +example in the LodePNG_InfoPng you can specify the color type you want to use, possible +tEXt chunks you want the PNG to contain, etc... For an explanation of all the +values in LodePNG_InfoPng see a further section. Not all PNG color types are supported +by the Encoder. + +Note that the encoder will only TRY to match the LodePNG_InfoPng struct you give. +Some things are ignored by the encoder. The width and height of LodePNG_InfoPng are +ignored as well, because instead the width and height of the raw image you give +in the input are used. In fact the encoder currently uses only the following +settings from it: +-colorType: the ones it supports +-text chunks, that you can add to the LodePNG_InfoPng with "addText" +-the color key, if applicable for the given color type +-the palette, if you encode to a PNG with colorType 3 +-the background color: it'll add a bKGD chunk to the PNG if one is given +-the interlaceMethod: None (0) or Adam7 (1) + +When encoding to a PNG with colorType 3, the encoder will generate a PLTE chunk. +If the palette contains any colors for which the alpha channel is not 255 (so +there are translucent colors in the palette), it'll add a tRNS chunk. + +=LodePNG_InfoRaw= + +You specify the color type of the raw image that you give to the input here, +including a possible transparent color key and palette you happen to be using in +your raw image data. + +By default, 32-bit color is assumed, meaning your input has to be in RGBA +format with 4 bytes (unsigned chars) per pixel. + +=Settings= + +The following settings are supported (some are in sub-structs): +*) autoLeaveOutAlphaChannel: when this option is enabled, when you specify a PNG +color type with alpha channel (not to be confused with the color type of the raw +image you specify!!), but the encoder detects that all pixels of the given image +are opaque, then it'll automatically use the corresponding type without alpha +channel, resulting in a smaller PNG image. +*) btype: the block type for LZ77. 0 = uncompressed, 1 = fixed huffman tree, 2 = dynamic huffman tree (best compression) +*) useLZ77: whether or not to use LZ77 for compressed block types +*) windowSize: the window size used by the LZ77 encoder (1 - 32768) +*) force_palette: if colorType is 2 or 6, you can make the encoder write a PLTE + chunk if force_palette is true. This can used as suggested palette to convert + to by viewers that don't support more than 256 colors (if those still exist) +*) add_id: add text chunk "Encoder: LodePNG <version>" to the image. +*) text_compression: default 0. If 1, it'll store texts as zTXt instead of tEXt chunks. + zTXt chunks use zlib compression on the text. This gives a smaller result on + large texts but a larger result on small texts (such as a single program name). + It's all tEXt or all zTXt though, there's no separate setting per text yet. + + +7. color conversions +-------------------- + +For trickier usage of LodePNG, you need to understand about PNG color types and +about how and when LodePNG uses the settings in LodePNG_InfoPng, LodePNG_InfoRaw and Settings. + +=PNG color types= + +A PNG image can have many color types, ranging from 1-bit color to 64-bit color, +as well as palettized color modes. After the zlib decompression and unfiltering +in the PNG image is done, the raw pixel data will have that color type and thus +a certain amount of bits per pixel. If you want the output raw image after +decoding to have another color type, a conversion is done by LodePNG. + +The PNG specification mentions the following color types: + +0: greyscale, bit depths 1, 2, 4, 8, 16 +2: RGB, bit depths 8 and 16 +3: palette, bit depths 1, 2, 4 and 8 +4: greyscale with alpha, bit depths 8 and 16 +6: RGBA, bit depths 8 and 16 + +Bit depth is the amount of bits per color channel. + +=Default Behaviour of LodePNG= + +By default, the Decoder will convert the data from the PNG to 32-bit RGBA color, +no matter what color type the PNG has, so that the result can be used directly +as a texture in OpenGL etc... without worries about what color type the original +image has. + +The Encoder assumes by default that the raw input you give it is a 32-bit RGBA +buffer and will store the PNG as either 32 bit or 24 bit depending on whether +or not any translucent pixels were detected in it. + +To get the default behaviour, don't change the values of LodePNG_InfoRaw and LodePNG_InfoPng of +the encoder, and don't change the values of LodePNG_InfoRaw of the decoder. + +=Color Conversions= + +As explained in the sections about the Encoder and Decoder, you can specify +color types and bit depths in LodePNG_InfoPng and LodePNG_InfoRaw, to change the default behaviour +explained above. (for the Decoder you can only specify the LodePNG_InfoRaw, because the +LodePNG_InfoPng contains what the PNG file has). + +To avoid some confusion: +-the Decoder converts from PNG to raw image +-the Encoder converts from raw image to PNG +-the color type and bit depth in LodePNG_InfoRaw, are those of the raw image +-the color type and bit depth in LodePNG_InfoPng, are those of the PNG +-if the color type of the LodePNG_InfoRaw and PNG image aren't the same, a conversion +between the color types is done if the color types are supported + +Supported color types: +-It's possible to load PNGs from any colortype and to save PNGs of any colorType. +-Both encoder and decoder use the same converter. So both encoder and decoder +suport the same color types at the input and the output. So the decoder supports +any type of PNG image and can convert it to certain types of raw image, while the +encoder supports any type of raw data but only certain color types for the output PNG. +-The converter can convert from _any_ input color type, to 24-bit RGB or 32-bit RGBA +-The converter can convert from greyscale input color type, to 8-bit greyscale or greyscale with alpha +-If both color types are the same, conversion from anything to anything is possible +-Color types that are invalid according to the PNG specification are not allowed +-When converting from a type with alpha channel to one without, the alpha channel information is discarded +-When converting from a type without alpha channel to one with, the result will be opaque except pixels that have the same color as the color key of the input if one was given +-When converting from 16-bit bitDepth to 8-bit bitDepth, the 16-bit precision information is lost, only the most significant byte is kept +-Converting from color to greyscale is not supported on purpose: choosing what kind of color to greyscale conversion to do is not a decision a PNG codec should make +-Converting from/to a palette type, only keeps the indices, it ignores the colors defined in the palette + +No conversion needed...: +-If the color type of the PNG image and raw image are the same, then no +conversion is done, and all color types are supported. +-In the encoder, you can make it save a PNG with any color by giving the +LodePNG_InfoRaw and LodePNG_InfoPng the same color type. +-In the decoder, you can make it store the pixel data in the same color type +as the PNG has, by setting the color_convert setting to false. Settings in +infoRaw are then ignored. + +The function LodePNG_convert does this, which is available in the interface but +normally isn't needed since the encoder and decoder already call it. + +=More Notes= + +In the PNG file format, if a less than 8-bit per pixel color type is used and the scanlines +have a bit amount that isn't a multiple of 8, then padding bits are used so that each +scanline starts at a fresh byte. +However: The input image you give to the encoder, and the output image you get from the decoder +will NOT have these padding bits in that case, e.g. in the case of a 1-bit image with a width +of 7 pixels, the first pixel of the second scanline will the the 8th bit of the first byte, +not the first bit of a new byte. + +8. info values +-------------- + +Both the encoder and decoder use a variable of type LodePNG_InfoPng and LodePNG_InfoRaw, which +both also contain a LodePNG_InfoColor. Here's a list of each of the values stored in them: + +*) info from the PNG header (IHDR chunk): + +width: width of the image in pixels +height: height of the image in pixels +colorType: color type of the original PNG file +bitDepth: bits per sample +compressionMethod: compression method of the original file. Always 0. +filterMethod: filter method of the original file. Always 0. +interlaceMethod: interlace method of the original file. 0 is no interlace, 1 is adam7 interlace. + +Note: width and height are only used as information of a decoded PNG image. When encoding one, you don't have +to specify width and height in an LodePNG_Info struct, but you give them as parameters of the encode function. +The rest of the LodePNG_Info struct IS used by the encoder though! + +*) palette: + +This is a dynamically allocated unsigned char array with the colors of the palette. The value palettesize +indicates the amount of colors in the palette. The allocated size of the buffer is 4 * palettesize bytes, +because there are 4 values per color: R, G, B and A. Even if less color channels are used, the palette +is always in RGBA format, in the order RGBARGBARGBA..... + +When encoding a PNG, to store your colors in the palette of the LodePNG_InfoRaw, first use +LodePNG_InfoColor_clearPalette, then for each color use LodePNG_InfoColor_addPalette. +In the C++ version the Encoder class also has the above functions available directly in its interface. + +Note that the palette information from the tRNS chunk is also already included in this palette vector. + +If you encode an image with palette, don't forget that you have to set the alpha channels (A) of the palette +too, set them to 255 for an opaque palette. If you leave them at zero, the image will be encoded as +fully invisible. This both for the palette in the infoRaw and the infoPng if the png is to have a palette. + +*) transparent color key + +key_defined: is a transparent color key given? +key_r: red/greyscale component of color key +key_g: green component of color key +key_b: blue component of color key + +For greyscale PNGs, r, g and b will all 3 be set to the same. + +This color is 8-bit for 8-bit PNGs, 16-bit for 16-bit per channel PNGs. + +*) suggested background color + +background_defined: is a suggested background color given? +background_r: red component of sugg. background color +background_g: green component of sugg. background color +background_b: blue component of sugg. background color + +This color is 8-bit for 8-bit PNGs, 16-bit for 16-bit PNGs + +For greyscale PNGs, r, g and b will all 3 be set to the same. When encoding +the encoder writes the red one away. +For palette PNGs: When decoding, the RGB value will be stored, no a palette +index. But when encoding, specify the index of the palette in background_r, +the other two are then ignored. + +The decoder pretty much ignores this background color, after all if you make a +PNG translucent normally you intend it to be used against any background, on +websites, as translucent textures in games, ... But you can get the color this +way if needed. + +*) text and itext + +Non-international text: + +-text.keys: a char** buffer containing the keywords (see below) +-text.strings: a char** buffer containing the texts (see below) +-text.num: the amount of texts in the above char** buffers (there may be more texts in itext) +-LodePNG_InfoText_clearText: use this to clear the texts again after you filled them in +-LodePNG_InfoText_addText: this function is used to push back a keyword and text + +International text: This is stored in separate arrays! The sum text.num and itext.num is the real amount of texts. + +-itext.keys: keyword in English +-itext.langtags: ISO 639 letter code for the language +-itext.transkeys: keyword in this language +-itext.strings: the text in this language, in UTF-8 +-itext.num: the amount of international texts in this PNG +-LodePNG_InfoIText_clearText: use this to clear the itexts again after you filled them in +-LodePNG_InfoIText_addText: this function is used to push back all 4 parts of an itext + +Don't allocate these text buffers yourself. Use the init/cleanup functions +correctly and use addText and clearText. + +In the C++ version the Encoder class also has the above functions available directly in its interface. +The char** buffers are used like the argv parameter of a main() function, and (i)text.num takes the role +of argc. + +In a text, there must be as much keys as strings because they always form pairs. In an itext, +there must always be as much keys, langtags, transkeys and strings. + +They keyword of text chunks gives a short description what the actual text +represents. There are a few standard standard keywords recognised +by many programs: Title, Author, Description, Copyright, Creation Time, +Software, Disclaimer, Warning, Source, Comment. It's allowed to use other keys. + +The keyword is minimum 1 character and maximum 79 characters long. It's +discouraged to use a single line length longer than 79 characters for texts. + +*) additional color info + +These functions are available with longer names in the C version, and directly +in the Decoder's interface in the C++ version. + +getBpp(): bits per pixel of the PNG image +getChannels(): amount of color channels of the PNG image +isGreyscaleType(): it's color type 0 or 4 +isAlphaType(): it's color type 2 or 6 + +These values are calculated out of color type and bit depth of InfoColor. + +The difference between bits per pixel and bit depth is that bit depth is the +number of bits per color channel, while a pixel can have multiple channels. + +*) pHYs chunk (image dimensions) + +phys_defined: if 0, there is no pHYs chunk and the values are undefined, if 1 else there is one +phys_x: pixels per unit in x direction +phys_y: pixels per unit in y direction +phys_unit: the unit, 0 is no unit (x and y only give the ratio), 1 is metre + +*) tIME chunk (modification time) + +time_defined: if 0, there is no tIME chunk and the values are undefined, if 1 there is one +time: this struct contains year as a 2-byte number (0-65535), month, day, hour, minute, +second as 1-byte numbers that must be in the correct range + +Note: to make the encoder add a time chunk, set time_defined to 1 and fill in +the correct values in all the time parameters, LodePNG will not fill the current +time in these values itself, all it does is copy them over into the chunk bytes. + + +9. error values +--------------- + +The meanings of the LodePNG error values: + +*) 0: no error, everything went ok +*) 1: the Encoder/Decoder has done nothing yet, so error checking makes no sense yet +*) 10: while huffman decoding: end of input memory reached without endcode +*) 11: while huffman decoding: error in code tree made it jump outside of tree +*) 13: problem while processing dynamic deflate block +*) 14: problem while processing dynamic deflate block +*) 15: problem while processing dynamic deflate block +*) 16: unexisting code while processing dynamic deflate block +*) 17: while inflating: end of out buffer memory reached +*) 18: while inflating: invalid distance code +*) 19: while inflating: end of out buffer memory reached +*) 20: invalid deflate block BTYPE encountered while decoding +*) 21: NLEN is not ones complement of LEN in a deflate block +*) 22: while inflating: end of out buffer memory reached. + This can happen if the inflated deflate data is longer than the amount of bytes required to fill up + all the pixels of the image, given the color depth and image dimensions. Something that doesn't + happen in a normal, well encoded, PNG image. +*) 23: while inflating: end of in buffer memory reached +*) 24: invalid FCHECK in zlib header +*) 25: invalid compression method in zlib header +*) 26: FDICT encountered in zlib header while it's not used for PNG +*) 27: PNG file is smaller than a PNG header +*) 28: incorrect PNG signature (the first 8 bytes of the PNG file) + Maybe it's not a PNG, or a PNG file that got corrupted so that the header indicates the corruption. +*) 29: first chunk is not the header chunk +*) 30: chunk length too large, chunk broken off at end of file +*) 31: illegal PNG color type or bpp +*) 32: illegal PNG compression method +*) 33: illegal PNG filter method +*) 34: illegal PNG interlace method +*) 35: chunk length of a chunk is too large or the chunk too small +*) 36: illegal PNG filter type encountered +*) 37: illegal bit depth for this color type given +*) 38: the palette is too big (more than 256 colors) +*) 39: more palette alpha values given in tRNS, than there are colors in the palette +*) 40: tRNS chunk has wrong size for greyscale image +*) 41: tRNS chunk has wrong size for RGB image +*) 42: tRNS chunk appeared while it was not allowed for this color type +*) 43: bKGD chunk has wrong size for palette image +*) 44: bKGD chunk has wrong size for greyscale image +*) 45: bKGD chunk has wrong size for RGB image +*) 46: value encountered in indexed image is larger than the palette size (bitdepth == 8). Is the palette too small? +*) 47: value encountered in indexed image is larger than the palette size (bitdepth < 8). Is the palette too small? +*) 48: the input data is empty. Maybe a PNG file you tried to load doesn't exist or is in the wrong path. +*) 49: jumped past memory while generating dynamic huffman tree +*) 50: jumped past memory while generating dynamic huffman tree +*) 51: jumped past memory while inflating huffman block +*) 52: jumped past memory while inflating +*) 53: size of zlib data too small +*) 55: jumped past tree while generating huffman tree, this could be when the + tree will have more leaves than symbols after generating it out of the + given lenghts. They call this an oversubscribed dynamic bit lengths tree in zlib. +*) 56: given output image colorType or bitDepth not supported for color conversion +*) 57: invalid CRC encountered (checking CRC can be disabled) +*) 58: invalid ADLER32 encountered (checking ADLER32 can be disabled) +*) 59: conversion to unexisting or unsupported color type or bit depth requested by encoder or decoder +*) 60: invalid window size given in the settings of the encoder (must be 0-32768) +*) 61: invalid BTYPE given in the settings of the encoder (only 0, 1 and 2 are allowed) +*) 62: conversion from non-greyscale color to greyscale color requested by encoder or decoder. LodePNG + leaves the choice of RGB to greyscale conversion formula to the user. +*) 63: length of a chunk too long, max allowed for PNG is 2147483647 bytes per chunk (2^31-1) +*) 64: the length of the "end" symbol 256 in the Huffman tree is 0, resulting in the inability of a deflated + block to ever contain an end code. It must be at least 1. +*) 66: the length of a text chunk keyword given to the encoder is longer than the maximum 79 bytes. +*) 67: the length of a text chunk keyword given to the encoder is smaller than the minimum 1 byte. +*) 68: tried to encode a PLTE chunk with a palette that has less than 1 or more than 256 colors +*) 69: unknown chunk type with "critical" flag encountered by the decoder +*) 71: unexisting interlace mode given to encoder (must be 0 or 1) +*) 72: while decoding, unexisting compression method encountering in zTXt or iTXt chunk (it must be 0) +*) 73: invalid tIME chunk size +*) 74: invalid pHYs chunk size +*) 75: no null termination char found while decoding any kind of text chunk, or wrong length +*) 76: iTXt chunk too short to contain required bytes +*) 77: integer overflow in buffer size happened somewhere +*) 78: file doesn't exist or couldn't be opened for reading +*) 79: file couldn't be opened for writing +*) 80: tried creating a tree for 0 symbols +*) 9900-9999: out of memory while allocating chunk of memory somewhere + + +10. file IO +----------- + +For cases where you want to load the PNG image from a file, you can use your own +file loading code, or the file loading and saving functions provided with +LodePNG. These use the same unsigned char format used by the Decoder and Encoder. + +The loadFile function fills the given buffer up with the file from harddisk +with the given name. + +The saveFile function saves the contents of the given buffer to the file +with given name. Warning: this overwrites the contents that were previously in +the file if it already existed, without warning. + +Note that you don't have to decode a PNG image from a file, you can as well +retrieve the buffer another way in your code, because the decode function takes +a buffer as parameter, not a filename. + +Both C and C++ versions of the loadFile and saveFile functions are available. +For the C version of loadFile, you need to free() the buffer after use. The +C++ versions use std::vectors so they clean themselves automatically. + + +11. chunks and PNG editing +-------------------------- + +If you want to add extra chunks to a PNG you encode, or use LodePNG for a PNG +editor that should follow the rules about handling of unknown chunks, or if you +program is able to read other types of chunks than the ones handled by LodePNG, +then that's possible with the chunk functions of LodePNG. + +A PNG chunk has the following layout: + +4 bytes length +4 bytes type name +length bytes data +4 bytes CRC + + +11.1 iterating through chunks +----------------------------- + +If you have a buffer containing the PNG image data, then the first chunk (the +IHDR chunk) starts at byte number 8 of that buffer. The first 8 bytes are the +signature of the PNG and are not part of a chunk. But if you start at byte 8 +then you have a chunk, and can check the following things of it. + +NOTE: none of these functions check for memory buffer boundaries. To avoid +exploits, always make sure the buffer contains all the data of the chunks. +When using LodePNG_chunk_next, make sure the returned value is within the +allocated memory. + +unsigned LodePNG_chunk_length(const unsigned char* chunk): + +Get the length of the chunk's data. The total chunk length is this length + 12. + +void LodePNG_chunk_type(char type[5], const unsigned char* chunk): +unsigned char LodePNG_chunk_type_equals(const unsigned char* chunk, const char* type): + +Get the type of the chunk or compare if it's a certain type + +unsigned char LodePNG_chunk_critical(const unsigned char* chunk): +unsigned char LodePNG_chunk_private(const unsigned char* chunk): +unsigned char LodePNG_chunk_safetocopy(const unsigned char* chunk): + +Check if the chunk is critical in the PNG standard (only IHDR, PLTE, IDAT and IEND are). +Check if the chunk is private (public chunks are part of the standard, private ones not). +Check if the chunk is safe to copy. If it's not, then, when modifying data in a critical +chunk, unsafe to copy chunks of the old image may NOT be saved in the new one if your +program doesn't handle that type of unknown chunk. + +unsigned char* LodePNG_chunk_data(unsigned char* chunk): +const unsigned char* LodePNG_chunk_data_const(const unsigned char* chunk): + +Get a pointer to the start of the data of the chunk. + +unsigned LodePNG_chunk_check_crc(const unsigned char* chunk): +void LodePNG_chunk_generate_crc(unsigned char* chunk): + +Check if the crc is correct or generate a correct one. + +unsigned char* LodePNG_chunk_next(unsigned char* chunk): +const unsigned char* LodePNG_chunk_next_const(const unsigned char* chunk): + +Iterate to the next chunk. This works if you have a buffer with consecutive chunks. Note that these +functions do no boundary checking of the allocated data whatsoever, so make sure there is enough +data available in the buffer to be able to go to the next chunk. + +unsigned LodePNG_append_chunk(unsigned char** out, size_t* outlength, const unsigned char* chunk): +unsigned LodePNG_create_chunk(unsigned char** out, size_t* outlength, unsigned length, const char* type, const unsigned char* data): + +These functions are used to create new chunks that are appended to the data in *out that has +length *outlength. The append function appends an existing chunk to the new data. The create +function creates a new chunk with the given parameters and appends it. Type is the 4-letter +name of the chunk. + + +11.2 chunks in infoPng +---------------------- + +The LodePNG_InfoPng struct contains a struct LodePNG_UnknownChunks in it. This +struct has 3 buffers (each with size) to contain 3 types of unknown chunks: +the ones that come before the PLTE chunk, the ones that come between the PLTE +and the IDAT chunks, and the ones that come after the IDAT chunks. +It's necessary to make the distionction between these 3 cases because the PNG +standard forces to keep the ordering of unknown chunks compared to the critical +chunks, but does not force any other ordering rules. + +infoPng.unknown_chunks.data[0] is the chunks before PLTE +infoPng.unknown_chunks.data[1] is the chunks after PLTE, before IDAT +infoPng.unknown_chunks.data[2] is the chunks after IDAT + +The chunks in these 3 buffers can be iterated through and read by using the same +way described in the previous subchapter. + +When using the decoder to decode a PNG, you can make it store all unknown chunks +if you set the option settings.rememberUnknownChunks to 1. By default, this option +is off and is 0. + +The encoder will always encode unknown chunks that are stored in the infoPng. If +you need it to add a particular chunk that isn't known by LodePNG, you can use +LodePNG_append_chunk or LodePNG_create_chunk to the chunk data in +infoPng.unknown_chunks.data[x]. + +Chunks that are known by LodePNG should not be added in that way. E.g. to make +LodePNG add a bKGD chunk, set background_defined to true and add the correct +parameters there and LodePNG will generate the chunk. + + +12. compiler support +-------------------- + +No libraries other than the current standard C library are needed to compile +LodePNG. For the C++ version, only the standard C++ library is needed on top. +Add the files lodepng.c(pp) and lodepng.h to your project, include +lodepng.h where needed, and your program can read/write PNG files. + +Use optimization! For both the encoder and decoder, compiling with the best +optimizations makes a large difference. + +Make sure that LodePNG is compiled with the same compiler of the same version +and with the same settings as the rest of the program, or the interfaces with +std::vectors and std::strings in C++ can be incompatible resulting in bad things. + +CHAR_BITS must be 8 or higher, because LodePNG uses unsigned chars for octets. + +*) gcc and g++ + +LodePNG is developed in gcc so this compiler is natively supported. It gives no +warnings with compiler options "-Wall -Wextra -pedantic -ansi", with gcc and g++ +version 4.2.2 on Linux. + +*) Mingw and Bloodshed DevC++ + +The Mingw compiler (a port of gcc) used by Bloodshed DevC++ for Windows is fully +supported by LodePNG. + +*) Visual Studio 2005 and Visual C++ 2005 Express Edition + +Versions 20070604 up to 20080107 have been tested on VS2005 and work. There are no +warnings, except two warnings about 'fopen' being deprecated. 'fopen' is a function +required by the C standard, so this warning is the fault of VS2005, it's nice of +them to enforce secure code, however the multiplatform LodePNG can't follow their +non-standard extensions. LodePNG is fully ISO C90 compliant. + +If you're using LodePNG in VS2005 and don't want to see the deprecated warnings, +put this on top of lodepng.h before the inclusions: #define _CRT_SECURE_NO_DEPRECATE + +*) Visual Studio 6.0 + +The C++ version of LodePNG was not supported by Visual Studio 6.0 because Visual +Studio 6.0 doesn't follow the C++ standard and implements it incorrectly. +The current C version of LodePNG has not been tested in VS6 but may work now. + +*) Comeau C/C++ + +Vesion 20070107 compiles without problems on the Comeau C/C++ Online Test Drive +at http://www.comeaucomputing.com/tryitout in both C90 and C++ mode. + +*) Compilers on Macintosh + +I'd love to support Macintosh but don't have one available to test it on. +If it doesn't work with your compiler, maybe it can be gotten to work with the +gcc compiler for Macintosh. Someone reported that it doesn't work well at all +for Macintosh. All information on attempts to get it to work on Mac is welcome. + +*) Other Compilers + +If you encounter problems on other compilers, I'm happy to help out make LodePNG +support the compiler if it supports the ISO C90 and C++ standard well enough. If +the required modification to support the compiler requires using non standard or +lesser C/C++ code or headers, I won't support it. + + +13. examples +------------ + +This decoder and encoder example show the most basic usage of LodePNG (using the +classes, not the simple functions, which would be trivial) + +More complex examples can be found in: +-lodepng_examples.c: 9 different examples in C, such as showing the image with SDL, ... +-lodepng_examples.cpp: the exact same examples in C++ using the C++ wrapper of LodePNG + + +13.1. decoder C++ example +------------------------- + +//////////////////////////////////////////////////////////////////////////////// +#include "lodepng.h" +#include <iostream> + +int main(int argc, char *argv[]) +{ + const char* filename = argc > 1 ? argv[1] : "test.png"; + + //load and decode + std::vector<unsigned char> buffer, image; + LodePNG::loadFile(buffer, filename); //load the image file with given filename + LodePNG::Decoder decoder; + decoder.decode(image, buffer.size() ? &buffer[0] : 0, (unsigned)buffer.size()); //decode the png + + //if there's an error, display it + if(decoder.hasError()) std::cout << "error: " << decoder.getError() << std::endl; + + //the pixels are now in the vector "image", use it as texture, draw it, ... +} + +//alternative version using the "simple" function +int main(int argc, char *argv[]) +{ + const char* filename = argc > 1 ? argv[1] : "test.png"; + + //load and decode + std::vector<unsigned char> image; + unsigned w, h; + unsigned error = LodePNG::decode(image, w, h, filename); + + //if there's an error, display it + if(error != 0) std::cout << "error: " << error << std::endl; + + //the pixels are now in the vector "image", use it as texture, draw it, ... +} +//////////////////////////////////////////////////////////////////////////////// + + +13.2 encoder C++ example +------------------------ + +//////////////////////////////////////////////////////////////////////////////// +#include "lodepng.h" +#include <iostream> + +int main(int argc, char *argv[]) +{ + //check if user gave a filename + if(argc <= 1) + { + std::cout << "please provide a filename to save to\n"; + return 0; + } + + //generate some image + std::vector<unsigned char> image; + image.resize(512 * 512 * 4); + for(unsigned y = 0; y < 512; y++) + for(unsigned x = 0; x < 512; x++) + { + image[4 * 512 * y + 4 * x + 0] = 255 * !(x & y); + image[4 * 512 * y + 4 * x + 1] = x ^ y; + image[4 * 512 * y + 4 * x + 2] = x | y; + image[4 * 512 * y + 4 * x + 3] = 255; + } + + //encode and save + std::vector<unsigned char> buffer; + LodePNG::Encoder encoder; + encoder.encode(buffer, image, 512, 512); + LodePNG::saveFile(buffer, argv[1]); + + //the same as the 4 lines of code above, but in 1 call: + //LodePNG::encode(argv[1], image, 512, 512); +} +//////////////////////////////////////////////////////////////////////////////// + + +13.3 Decoder C example +---------------------- + +This example loads the PNG in 1 function call + +#include "lodepng.h" + +int main(int argc, char *argv[]) +{ + unsigned error; + unsigned char* image; + size_t w, h; + + if(argc <= 1) return 0; + + error = LodePNG_decode3(&image, &w, &h, filename); + + free(image); +} + + +14. LodeZlib +------------ + +Also available in the interface is LodeZlib. Both C and C++ versions of these +functions are available. The interface is similar to that of the "simple" PNG +encoding and decoding functions. + +LodeZlib can be used to zlib compress and decompress a buffer. It cannot be +used to create gzip files however. Also, it only supports the part of zlib +that is required for PNG, it does not support compression and decompression +with dictionaries. + + +15. changes +----------- + +The version number of LodePNG is the date of the change given in the format +yyyymmdd. + +Some changes aren't backwards compatible. Those are indicated with a (!) +symbol. + +*) 02 sep 2008: fixed bug where it could create empty tree that linux apps could + read by ignoring the problem but windows apps couldn't. +*) 06 jun 2008: added more error checks for out of memory cases. +*) 26 apr 2008: added a few more checks here and there to ensure more safety. +*) 06 mar 2008: crash with encoding of strings fixed +*) 02 feb 2008: support for international text chunks added (iTXt) +*) 23 jan 2008: small cleanups, and #defines to divide code in sections +*) 20 jan 2008: support for unknown chunks allowing using LodePNG for an editor. +*) 18 jan 2008: support for tIME and pHYs chunks added to encoder and decoder. +*) 17 jan 2008: ability to encode and decode compressed zTXt chunks added + Also vareous fixes, such as in the deflate and the padding bits code. +*) 13 jan 2008: Added ability to encode Adam7-interlaced images. Improved + filtering code of encoder. +*) 07 jan 2008: (!) changed LodePNG to use ISO C90 instead of C++. A + C++ wrapper around this provides an interface almost identical to before. + Having LodePNG be pure ISO C90 makes it more portable. The C and C++ code + are together in these files but it works both for C and C++ compilers. +*) 29 dec 2007: (!) changed most integer types to unsigned int + other tweaks +*) 30 aug 2007: bug fixed which makes this Borland C++ compatible +*) 09 aug 2007: some VS2005 warnings removed again +*) 21 jul 2007: deflate code placed in new namespace separate from zlib code +*) 08 jun 2007: fixed bug with 2- and 4-bit color, and small interlaced images +*) 04 jun 2007: improved support for Visual Studio 2005: crash with accessing + invalid std::vector element [0] fixed, and level 3 and 4 warnings removed +*) 02 jun 2007: made the encoder add a tag with version by default +*) 27 may 2007: zlib and png code separated (but still in the same file), + simple encoder/decoder functions added for more simple usage cases +*) 19 may 2007: minor fixes, some code cleaning, new error added (error 69), + moved some examples from here to lodepng_examples.cpp +*) 12 may 2007: palette decoding bug fixed +*) 24 apr 2007: changed the license from BSD to the zlib license +*) 11 mar 2007: very simple addition: ability to encode bKGD chunks. +*) 04 mar 2007: (!) tEXt chunk related fixes, and support for encoding + palettized PNG images. Plus little interface change with palette and texts. +*) 03 mar 2007: Made it encode dynamic Huffman shorter with repeat codes. + Fixed a bug where the end code of a block had length 0 in the Huffman tree. +*) 26 feb 2007: Huffman compression with dynamic trees (BTYPE 2) now implemented + and supported by the encoder, resulting in smaller PNGs at the output. +*) 27 jan 2007: Made the Adler-32 test faster so that a timewaste is gone. +*) 24 jan 2007: gave encoder an error interface. Added color conversion from any + greyscale type to 8-bit greyscale with or without alpha. +*) 21 jan 2007: (!) Totally changed the interface. It allows more color types + to convert to and is more uniform. See the manual for how it works now. +*) 07 jan 2007: Some cleanup & fixes, and a few changes over the last days: + encode/decode custom tEXt chunks, separate classes for zlib & deflate, and + at last made the decoder give errors for incorrect Adler32 or Crc. +*) 01 jan 2007: Fixed bug with encoding PNGs with less than 8 bits per channel. +*) 29 dec 2006: Added support for encoding images without alpha channel, and + cleaned out code as well as making certain parts faster. +*) 28 dec 2006: Added "Settings" to the encoder. +*) 26 dec 2006: The encoder now does LZ77 encoding and produces much smaller files now. + Removed some code duplication in the decoder. Fixed little bug in an example. +*) 09 dec 2006: (!) Placed output parameters of public functions as first parameter. + Fixed a bug of the decoder with 16-bit per color. +*) 15 okt 2006: Changed documentation structure +*) 09 okt 2006: Encoder class added. It encodes a valid PNG image from the + given image buffer, however for now it's not compressed. +*) 08 sep 2006: (!) Changed to interface with a Decoder class +*) 30 jul 2006: (!) LodePNG_InfoPng , width and height are now retrieved in different + way. Renamed decodePNG to decodePNGGeneric. +*) 29 jul 2006: (!) Changed the interface: image info is now returned as a + struct of type LodePNG::LodePNG_Info, instead of a vector, which was a bit clumsy. +*) 28 jul 2006: Cleaned the code and added new error checks. + Corrected terminology "deflate" into "inflate". +*) 23 jun 2006: Added SDL example in the documentation in the header, this + example allows easy debugging by displaying the PNG and its transparency. +*) 22 jun 2006: (!) Changed way to obtain error value. Added + loadFile function for convenience. Made decodePNG32 faster. +*) 21 jun 2006: (!) Changed type of info vector to unsigned. + Changed position of palette in info vector. Fixed an important bug that + happened on PNGs with an uncompressed block. +*) 16 jun 2006: Internally changed unsigned into unsigned where + needed, and performed some optimizations. +*) 07 jun 2006: (!) Renamed functions to decodePNG and placed them + in LodePNG namespace. Changed the order of the parameters. Rewrote the + documentation in the header. Renamed files to lodepng.cpp and lodepng.h +*) 22 apr 2006: Optimized and improved some code +*) 07 sep 2005: (!) Changed to std::vector interface +*) 12 aug 2005: Initial release + + +16. contact information +----------------------- + +Feel free to contact me with suggestions, problems, comments, ... concerning +LodePNG. If you encounter a PNG image that doesn't work properly with this +decoder, feel free to send it and I'll use it to find and fix the problem. + +My email address is (puzzle the account and domain together with an @ symbol): +Domain: gmail dot com. +Account: lode dot vandevenne. + + +Copyright (c) 2005-2008 Lode Vandevenne +*/ |