diff options
Diffstat (limited to 'src/im_convertbitmap.cpp')
| -rw-r--r-- | src/im_convertbitmap.cpp | 165 |
1 files changed, 164 insertions, 1 deletions
diff --git a/src/im_convertbitmap.cpp b/src/im_convertbitmap.cpp index c9570d7..9d3c720 100644 --- a/src/im_convertbitmap.cpp +++ b/src/im_convertbitmap.cpp @@ -2,7 +2,7 @@ * \brief Image Conversion * * See Copyright Notice in im_lib.h - * $Id: im_convertbitmap.cpp,v 1.1 2008/10/17 06:10:16 scuri Exp $ + * $Id: im_convertbitmap.cpp,v 1.2 2009/08/13 22:34:25 scuri Exp $ */ #include "im.h" @@ -119,3 +119,166 @@ void imConvertPacking(const void* src_data, void* dst_data, int width, int heigh } } +static void iImageMakeGray(imbyte *map, int count, int step) +{ + for(int i = 0; i < count; i++) + { + if (*map) + *map = 255; + map += step; + } +} + +static void iImageCopyMapAlpha(imbyte *map, imbyte *gldata, int depth, int count) +{ + /* gldata can be GL_RGBA or GL_LUMINANCE_ALPHA */ + gldata += depth-1; /* position at first alpha */ + for(int i = 0; i < count; i++) + { + *gldata = *map; + map++; + gldata += depth; /* skip to next alpha */ + } +} + +static void iImageSetTranspMap(imbyte *map, imbyte *gldata, int count, imbyte *transp_map, int transp_count) +{ + /* gldata is GL_RGBA */ + gldata += 3; /* position at first alpha */ + for(int i = 0; i < count; i++) + { + if (*map < transp_count) + *gldata = transp_map[*map]; + else + *gldata = 255; /* opaque */ + + map++; + gldata += 4; + } +} + +static void iImageSetTranspColor(imbyte *gldata, int count, imbyte r, imbyte g, imbyte b) +{ + /* gldata is GL_RGBA */ + for(int i = 0; i < count; i++) + { + if (*(gldata+0) == r && + *(gldata+1) == g && + *(gldata+2) == b) + *(gldata+3) = 0; /* transparent */ + else + *(gldata+3) = 255; /* opaque */ + gldata += 4; + } +} + +static void iImageSetTranspIndex(imbyte *map, imbyte *gldata, int depth, int count, imbyte index) +{ + /* gldata can be GL_RGBA or GL_LUMINANCE_ALPHA */ + gldata += depth-1; /* position at first alpha */ + for(int i = 0; i < count; i++) + { + if (*map == index) + *gldata = 0; /* full transparent */ + else + *gldata = 255; /* opaque */ + + map++; + gldata += depth; /* skip to next alpha */ + } +} + +/* To avoid including gl.h */ +#define GL_RGB 0x1907 +#define GL_RGBA 0x1908 +#define GL_LUMINANCE 0x1909 +#define GL_LUMINANCE_ALPHA 0x190A + +void* imImageGetOpenGLData(const imImage* image, int *format) +{ + if (!imImageIsBitmap(image)) + return NULL; + + int transp_count; + imbyte* transp_index = (imbyte*)imImageGetAttribute(image, "TransparencyIndex", NULL, NULL); + imbyte* transp_map = (imbyte*)imImageGetAttribute(image, "TransparencyMap", NULL, &transp_count); + imbyte* transp_color = (imbyte*)imImageGetAttribute(image, "TransparencyColor", NULL, NULL); + + int glformat; + switch(image->color_space) + { + case IM_MAP: + if (image->has_alpha || transp_map || transp_index) + glformat = GL_RGBA; + else + glformat = GL_RGB; + break; + case IM_RGB: + if (image->has_alpha || transp_color) + glformat = GL_RGBA; + else + glformat = GL_RGB; + break; + case IM_BINARY: + default: /* IM_GRAY */ + if (image->has_alpha || transp_index) + glformat = GL_LUMINANCE_ALPHA; + else + glformat = GL_LUMINANCE; + break; + } + + int depth; + switch (glformat) + { + case GL_RGB: + depth = 3; + break; + case GL_RGBA: + depth = 4; + break; + case GL_LUMINANCE_ALPHA: + depth = 2; + break; + default: /* GL_LUMINANCE */ + depth = 1; + break; + } + + int size = image->count*depth; + imImageSetAttribute(image, "GLDATA", IM_BYTE, size, NULL); + imbyte* gldata = (imbyte*)imImageGetAttribute(image, "GLDATA", NULL, NULL); + + if (image->color_space == IM_RGB) + { + if (image->has_alpha) + imConvertPacking(image->data[0], gldata, image->width, image->height, 4, IM_BYTE, 0); + else + { + imConvertPacking(image->data[0], gldata, image->width, image->height, 3, IM_BYTE, 0); + + if (transp_color) + iImageSetTranspColor(gldata, image->count, *(transp_color+0), *(transp_color+1), *(transp_color+2)); + } + } + else + { + memcpy(gldata, image->data[0], image->size); + + if (image->color_space == IM_MAP) + imConvertMapToRGB(gldata, image->count, depth, 1, image->palette, image->palette_count); + else if (image->color_space == IM_BINARY) + iImageMakeGray(gldata, image->count, (glformat==GL_LUMINANCE_ALPHA)? 2: 1); + + if (image->has_alpha) + iImageCopyMapAlpha((imbyte*)image->data[1], gldata, depth, image->count); + else if (transp_map) + iImageSetTranspMap((imbyte*)image->data[0], gldata, image->count, transp_map, transp_count); + else if (transp_index) + iImageSetTranspIndex((imbyte*)image->data[0], gldata, depth, image->count, *transp_index); + } + + if (format) *format = glformat; + return gldata; +} + |