First commit - moving from LuaForge to SourceForge

8 files changed, 4512 insertions, 0 deletions

diff --git a/src/x11/cdx11.c b/src/x11/cdx11.c
new file mode 100644
index 0000000..62e81ed
--- /dev/null
+++ b/src/x11/cdx11.c
@@ -0,0 +1,2447 @@
+/** \file
+ * \brief X-Windows Base Driver
+ *
+ * See Copyright Notice in cd.h
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <string.h>
+#include <math.h>
+
+#include "cdx11.h"
+#include "xvertex.h"
+
+#include <X11/Xproto.h>
+
+unsigned long (*cdxGetPixel)(cdCtxCanvas *ctxcanvas, unsigned long rgb); /* acesso a tabela de cores */
+void (*cdxGetRGB)(cdCtxCanvas *ctxcanvas, unsigned long pixel, 
+                                          unsigned char* red, 
+                                          unsigned char* green, 
+                                          unsigned char* blue); /* acesso a tabela de cores */
+static XGCValues gcval;
+
+static int cdxDirectColorTable[256];    /* used with directColor visuals */
+
+#define NUM_HATCHES  6
+#define HATCH_WIDTH  8
+#define HATCH_HEIGHT 8
+/* 
+** 6 padroes pre-definidos a serem acessados atraves de cdHatch(
+   CD_HORIZONTAL | CD_VERTICAL | CD_FDIAGONAL | CD_BDIAGONAL |
+   CD_CROSS      | CD_DIAGCROSS)
+
+*/
+static char hatches[NUM_HATCHES][8] = {
+  {0x00,0x00,0xFF,0x00,0x00,0x00,0xFF,0x00},  /* HORIZONTAL */
+  {0x22,0x22,0x22,0x22,0x22,0x22,0x22,0x22},  /* VERTICAL */
+  {0x08,0x10,0x20,0x40,0x80,0x01,0x02,0x04},  /* FDIAGONAL */
+  {0x10,0x08,0x04,0x02,0x01,0x80,0x40,0x20},  /* BDIAGONAL */
+  {0x22,0x22,0xFF,0x22,0x22,0x22,0xFF,0x22},  /* CROSS */
+  {0x18,0x18,0x24,0x42,0x81,0x81,0x42,0x24}   /* DIAGCROSS */
+};
+
+/******************************************************/
+
+static int cdxErrorHandler(Display* dpy, XErrorEvent *err)
+{
+  char msg[80];
+
+  /* Se for erro de BadMatch em XGetImage, tudo bem */
+  if (err->request_code==X_GetImage && err->error_code==BadMatch)
+    return 0;
+
+  /* Se for erro de BadAcess em XFreeColors, tudo bem */
+  if (err->request_code==X_FreeColors && err->error_code==BadAccess)
+    return 0;
+
+  XGetErrorText(dpy, err->error_code, msg, 80 );
+  fprintf(stderr,"CanvasDraw: Xlib request %d: %s\n", err->request_code, msg);
+
+  return 0;
+}
+                                
+static void update_colors(cdCtxCanvas *ctxcanvas)
+{
+  XQueryColors(ctxcanvas->dpy, ctxcanvas->colormap, ctxcanvas->color_table, ctxcanvas->num_colors);
+}
+
+static int find_color(cdCtxCanvas *ctxcanvas, XColor* xc1)
+{
+  int pos = 0, i;
+  unsigned long min_dist = ULONG_MAX, this_dist;
+  int dr, dg, db;
+  XColor* xc2;
+
+  for (i=0; i<ctxcanvas->num_colors; i++)
+  {
+    xc2 = &(ctxcanvas->color_table[i]);
+    
+    dr = (xc1->red   - xc2->red) / 850;       /* 0.30 / 255 */
+    dg = (xc1->green - xc2->green) / 432;     /* 0.59 / 255 */
+    db = (xc1->blue  - xc2->blue) /  2318;    /* 0.11 / 255 */
+    
+    this_dist = dr*dr + dg*dg + db*db;
+    
+    if (this_dist < min_dist)
+    {
+      min_dist = this_dist;            
+      pos = i;                          
+    }
+  }
+
+  return pos;
+}
+
+/* Busca o RGB mais proximo na tabela de cores */
+static unsigned long nearest_rgb(cdCtxCanvas *ctxcanvas, XColor* xc)
+{
+  static int nearest_try = 0;
+
+  int pos = find_color(ctxcanvas, xc);
+
+  /* verifico se a cor ainda esta alocada */
+  /* Try to allocate the closest match color.
+     This should fail only if the cell is read/write.
+     Otherwise, we're incrementing the cell's reference count.
+     (comentario extraido da biblioteca Mesa) */
+  if (!XAllocColor(ctxcanvas->dpy, ctxcanvas->colormap, &(ctxcanvas->color_table[pos])))
+  {
+    /* nao esta, preciso atualizar a tabela e procurar novamente */
+    /* isto acontece porque a cor encontrada pode ter sido de uma aplicacao que nao existe mais */
+    /* uma vez atualizada, o problema nao ocorrera' na nova procura */
+    /* ou a celula e' read write */
+
+    if (nearest_try == 1)
+    {
+      nearest_try = 0;
+      return ctxcanvas->color_table[pos].pixel;
+    }
+
+    /* o que e' mais lento? 
+       Dar um query colors em todo o nearest,                 --> Isso deve ser mais lento
+       ou fazer a busca acima antes e arriscar uma repeticao? */
+
+    update_colors(ctxcanvas);
+
+    nearest_try = 1; /* garante que so' vai tentar isso uma vez */
+    return nearest_rgb(ctxcanvas, xc);
+  }
+
+  return ctxcanvas->color_table[pos].pixel;
+}
+
+/* Funcao get_pixel usando tabela de conversao. \
+   Usada quando nao estamos em TrueColor. */
+static unsigned long not_truecolor_get_pixel(cdCtxCanvas *ctxcanvas, unsigned long rgb)
+{
+  unsigned long pixel;
+  XColor xc;
+  xc.red = cdCOLOR8TO16(cdRed(rgb));
+  xc.green = cdCOLOR8TO16(cdGreen(rgb));
+  xc.blue = cdCOLOR8TO16(cdBlue(rgb));
+  xc.flags = DoRed | DoGreen | DoBlue;
+
+  /* verificamos se a nova cor ja' esta' disponivel */
+  if (!XAllocColor(ctxcanvas->dpy, ctxcanvas->colormap, &xc))
+  {
+    /* nao estava disponivel, procuro pela mais proxima na tabela de cores */
+    pixel = nearest_rgb(ctxcanvas, &xc); 
+  }
+  else
+  {
+    /* ja' estava disponivel */
+    /* atualizo a tabela de cores */
+    ctxcanvas->color_table[xc.pixel] = xc;
+    pixel = xc.pixel;
+  }
+  
+  return pixel;
+}
+
+/*
+%F Funcao  usando tabela de conversao. \
+   Usada quando nao estamos em TrueColor.
+*/
+static void not_truecolor_get_rgb(cdCtxCanvas *ctxcanvas, unsigned long pixel, unsigned char* red, unsigned char* green, unsigned char* blue)
+{
+  XColor xc;
+  xc.pixel = pixel;
+  XQueryColor(ctxcanvas->dpy, ctxcanvas->colormap, &xc);
+  *red = cdCOLOR16TO8(xc.red);
+  *green = cdCOLOR16TO8(xc.green);
+  *blue = cdCOLOR16TO8(xc.blue);
+}
+
+/*
+%F Funcao get_rgb usada quando estamos em TrueColor.
+*/
+static void truecolor_get_rgb(cdCtxCanvas *ctxcanvas, unsigned long pixel, unsigned char* red, unsigned char* green, unsigned char* blue)
+{
+  unsigned long r = pixel & ctxcanvas->vis->red_mask;
+  unsigned long g = pixel & ctxcanvas->vis->green_mask;
+  unsigned long b = pixel & ctxcanvas->vis->blue_mask;
+  if (ctxcanvas->rshift<0) r = r >> (-ctxcanvas->rshift);
+  else r = r << ctxcanvas->rshift;
+  if (ctxcanvas->gshift<0) g = g >> (-ctxcanvas->gshift);
+  else g = g << ctxcanvas->gshift;
+  if (ctxcanvas->bshift<0) b = b >> (-ctxcanvas->bshift);
+  else b = b << ctxcanvas->bshift;
+  *red = cdCOLOR16TO8(r);
+  *green = cdCOLOR16TO8(g);
+  *blue = cdCOLOR16TO8(b);
+}
+
+/*
+%F Funcao get_pixel usada quando estamos em TrueColor.
+*/
+static unsigned long truecolor_get_pixel(cdCtxCanvas *ctxcanvas, unsigned long rgb)
+{
+  unsigned long r = cdCOLOR8TO16(cdRed(rgb));
+  unsigned long g = cdCOLOR8TO16(cdGreen(rgb));
+  unsigned long b = cdCOLOR8TO16(cdBlue(rgb));
+  
+  if (ctxcanvas->rshift<0) 
+    r = r << (-ctxcanvas->rshift);
+  else 
+    r = r >> ctxcanvas->rshift;
+    
+  if (ctxcanvas->gshift<0) 
+    g = g << (-ctxcanvas->gshift);
+  else 
+    g = g >> ctxcanvas->gshift;
+    
+  if (ctxcanvas->bshift<0) 
+    b = b << (-ctxcanvas->bshift);
+  else 
+    b = b >> ctxcanvas->bshift;
+    
+  r = r & ctxcanvas->vis->red_mask;
+  g = g & ctxcanvas->vis->green_mask;
+  b = b & ctxcanvas->vis->blue_mask;
+  
+  return r | g | b;
+}
+
+static int highbit(unsigned long ul)
+{
+/* returns position of highest set bit in 'ul' as an integer (0-31),
+  or -1 if none */
+  int i;  unsigned long hb;
+  
+  hb = 0x80;  hb = hb << 24;   /* hb = 0x80000000UL */
+  for (i=31; ((ul & hb) == 0) && i>=0;  i--, ul<<=1);
+  return i;
+}
+
+static void makeDirectCmap(cdCtxCanvas *ctxcanvas, Colormap cmap)
+{
+  int    i, cmaplen, numgot;
+  unsigned char   origgot[256];
+  XColor c;
+  unsigned long rmask, gmask, bmask;
+  int    rshift, gshift, bshift;
+  
+  rmask = ctxcanvas->vis->red_mask;
+  gmask = ctxcanvas->vis->green_mask;
+  bmask = ctxcanvas->vis->blue_mask;
+  
+  rshift = highbit(rmask) - 15;
+  gshift = highbit(gmask) - 15;
+  bshift = highbit(bmask) - 15;
+  
+  if (rshift<0) rmask = rmask << (-rshift);
+  else rmask = rmask >> rshift;
+  
+  if (gshift<0) gmask = gmask << (-gshift);
+  else gmask = gmask >> gshift;
+  
+  if (bshift<0) bmask = bmask << (-bshift);
+  else bmask = bmask >> bshift;
+  
+  cmaplen = ctxcanvas->vis->map_entries;
+  if (cmaplen>256) cmaplen=256;
+  
+  /* try to alloc a 'cmaplen' long grayscale colormap.  May not get all
+  entries for whatever reason.  Build table 'cdxDirectColorTable[]' that
+  maps range [0..(cmaplen-1)] into set of colors we did get */
+  
+  for (i=0; i<256; i++) {  origgot[i] = 0;  cdxDirectColorTable[i] = i; }
+  
+  for (i=numgot=0; i<cmaplen; i++) 
+  {
+    c.red = c.green = c.blue = (unsigned short)((i * 0xffff) / (cmaplen - 1));
+    c.red   = (unsigned short)(c.red   & rmask);
+    c.green = (unsigned short)(c.green & gmask);
+    c.blue  = (unsigned short)(c.blue  & bmask);
+    c.flags = DoRed | DoGreen | DoBlue;
+    
+    if (XAllocColor(ctxcanvas->dpy, cmap, &c)) 
+    {
+      origgot[i] = 1;
+      numgot++;
+    }
+  }
+  
+  if (numgot == 0) 
+    return;
+  
+  /* cdxDirectColorTable may or may not have holes in it. */
+  for (i=0; i<cmaplen; i++) 
+  {
+    if (!origgot[i]) 
+    {
+      int numbak, numfwd;
+      numbak = numfwd = 0;
+      while ((i - numbak) >= 0       && !origgot[i-numbak]) numbak++;
+      while ((i + numfwd) <  cmaplen && !origgot[i+numfwd]) numfwd++;
+      
+      if (i-numbak<0        || !origgot[i-numbak]) numbak = 999;
+      if (i+numfwd>=cmaplen || !origgot[i+numfwd]) numfwd = 999;
+      
+      if      (numbak<numfwd) cdxDirectColorTable[i] = cdxDirectColorTable[i-numbak];
+      else if (numfwd<999)    cdxDirectColorTable[i] = cdxDirectColorTable[i+numfwd];
+    }
+  }
+}
+
+/******************************************************/
+
+void cdxKillCanvas(cdCtxCanvas *ctxcanvas)
+{
+  if (ctxcanvas->canvas->bpp <= 8)
+  {
+    unsigned long pixels[256];
+    int i;
+
+    /* libera todas as cores usadas na palette */
+    for(i = 0; i < ctxcanvas->num_colors; i++)
+      pixels[i] = ctxcanvas->color_table[i].pixel;
+
+    if (ctxcanvas->colormap != DefaultColormap(ctxcanvas->dpy, ctxcanvas->scr))
+      XFreeColormap(ctxcanvas->dpy, ctxcanvas->colormap);
+  }
+ 
+  if (ctxcanvas->xidata) free(ctxcanvas->xidata);
+  if (ctxcanvas->font) XFreeFont(ctxcanvas->dpy, ctxcanvas->font);
+  if (ctxcanvas->last_hatch) XFreePixmap(ctxcanvas->dpy, ctxcanvas->last_hatch);
+  if (ctxcanvas->clip_polygon) XFreePixmap(ctxcanvas->dpy, ctxcanvas->clip_polygon);
+
+  if (ctxcanvas->new_region) 
+  {
+    XFreeGC(ctxcanvas->dpy, ctxcanvas->region_aux_gc); 
+    XFreePixmap(ctxcanvas->dpy, ctxcanvas->region_aux);
+    XFreePixmap(ctxcanvas->dpy, ctxcanvas->new_region);
+  }
+
+  if (ctxcanvas->last_pattern)
+  {
+    XFreeGC(ctxcanvas->dpy, ctxcanvas->last_pattern_gc); 
+    XFreePixmap(ctxcanvas->dpy, ctxcanvas->last_pattern);
+  }
+
+  if (ctxcanvas->last_stipple)
+  {
+    XFreeGC(ctxcanvas->dpy, ctxcanvas->last_stipple_gc); 
+    XFreePixmap(ctxcanvas->dpy, ctxcanvas->last_stipple);
+  }
+
+  XFreeGC(ctxcanvas->dpy, ctxcanvas->gc); 
+
+  free(ctxcanvas);
+}
+
+/******************************************************/
+
+static void cdflush(cdCtxCanvas *ctxcanvas)
+{
+  XFlush(ctxcanvas->dpy);
+}
+
+/******************************************************/
+
+static Pixmap build_clip_polygon(cdCtxCanvas *ctxcanvas, XPoint* pnt, int n)
+{
+  Pixmap pix = XCreatePixmap(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->canvas->w, ctxcanvas->canvas->h, 1);
+  GC gc = XCreateGC(ctxcanvas->dpy, pix, 0, NULL);
+
+  XSetForeground(ctxcanvas->dpy, gc, 0);
+  XFillRectangle(ctxcanvas->dpy, pix, gc, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h);
+
+  XSetForeground(ctxcanvas->dpy, gc, 1);
+  XSetFillRule(ctxcanvas->dpy, gc, ctxcanvas->canvas->fill_mode==CD_EVENODD?EvenOddRule:WindingRule);
+  XFillPolygon(ctxcanvas->dpy, pix, gc, pnt, n, Complex, CoordModeOrigin);
+
+  XFreeGC(ctxcanvas->dpy, gc);
+  return pix;
+}
+
+static void xsetclip_area(cdCtxCanvas *ctxcanvas)
+{
+  cdRect* clip_rect = &ctxcanvas->canvas->clip_rect;
+  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;
+    ctxcanvas->canvas->cxPoly(ctxcanvas, CD_CLIP, poly, 4);
+  }
+  else
+  {
+    XRectangle rect;
+    rect.x      = (short)clip_rect->xmin;
+    rect.y      = (short)clip_rect->ymin;
+    rect.width  = (unsigned short)(clip_rect->xmax - clip_rect->xmin + 1);
+    rect.height = (unsigned short)(clip_rect->ymax - clip_rect->ymin + 1);
+    XSetClipRectangles(ctxcanvas->dpy, ctxcanvas->gc, 0, 0, &rect, 1, Unsorted);
+  }
+}
+
+int cdxClip(cdCtxCanvas *ctxcanvas, int clip_mode)
+{
+  switch (clip_mode)
+  {
+  case CD_CLIPOFF:
+    XSetClipMask(ctxcanvas->dpy, ctxcanvas->gc, None);
+    break;
+  case CD_CLIPAREA:
+    xsetclip_area(ctxcanvas);
+    break;
+  case CD_CLIPPOLYGON:
+    if (ctxcanvas->clip_polygon)
+      XSetClipMask(ctxcanvas->dpy, ctxcanvas->gc, ctxcanvas->clip_polygon);
+    break;
+  case CD_CLIPREGION:
+    if (ctxcanvas->new_region)
+      XSetClipMask(ctxcanvas->dpy, ctxcanvas->gc, ctxcanvas->new_region);
+    break;
+  }
+  return clip_mode;
+}
+
+static void cdcliparea(cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax)
+{
+  if (ctxcanvas->canvas->clip_mode == CD_CLIPAREA) 
+  {
+    ctxcanvas->canvas->clip_rect.xmin = xmin;
+    ctxcanvas->canvas->clip_rect.ymin = ymin;
+    ctxcanvas->canvas->clip_rect.xmax = xmax;
+    ctxcanvas->canvas->clip_rect.ymax = ymax;
+    cdxClip(ctxcanvas, CD_CLIPAREA);
+  }
+}
+
+static void cdnewregion(cdCtxCanvas *ctxcanvas)
+{
+  if (ctxcanvas->new_region) 
+  {
+    XFreeGC(ctxcanvas->dpy, ctxcanvas->region_aux_gc); 
+    XFreePixmap(ctxcanvas->dpy, ctxcanvas->region_aux);
+    XFreePixmap(ctxcanvas->dpy, ctxcanvas->new_region);
+  }
+   
+  ctxcanvas->new_region = XCreatePixmap(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->canvas->w, ctxcanvas->canvas->h, 1);
+
+  {
+    GC gc = XCreateGC(ctxcanvas->dpy, ctxcanvas->new_region, 0, NULL);
+    XSetForeground(ctxcanvas->dpy, gc, 0);
+    XFillRectangle(ctxcanvas->dpy, ctxcanvas->new_region, gc, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h);
+    XFreeGC(ctxcanvas->dpy, gc);
+  }
+    
+  ctxcanvas->region_aux = XCreatePixmap(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->canvas->w, ctxcanvas->canvas->h, 1);
+  ctxcanvas->region_aux_gc = XCreateGC(ctxcanvas->dpy, ctxcanvas->region_aux, 0, NULL);
+  XSetBackground(ctxcanvas->dpy, ctxcanvas->region_aux_gc, 0);
+}
+
+static int cdispointinregion(cdCtxCanvas *ctxcanvas, int x, int y)
+{
+  if (!ctxcanvas->new_region)
+    return 0;
+
+  if (x >= 0  && y >= 0 && x < ctxcanvas->canvas->w && y < ctxcanvas->canvas->h)
+  {
+    long p;
+    XImage* img = XGetImage(ctxcanvas->dpy, ctxcanvas->new_region, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h, 1, XYPixmap); 
+    p = XGetPixel(img, x, y);
+    XDestroyImage(img);
+    
+    if (p) return 1;
+  }
+
+  return 0;
+}
+
+static void cdgetregionbox(cdCtxCanvas *ctxcanvas, int *xmin, int *xmax, int *ymin, int *ymax)
+{
+  if (!ctxcanvas->new_region)
+    return;
+    
+  *xmin = ctxcanvas->canvas->w-1;
+  *xmax = 0;
+  *ymin = ctxcanvas->canvas->h-1;
+  *ymax = 0;
+
+  {
+    int x, y;
+    long p;
+    XImage* img = XGetImage(ctxcanvas->dpy, ctxcanvas->new_region, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h, 1, XYPixmap); 
+  
+    for (y = 0; y < ctxcanvas->canvas->h; y++)
+    {
+      for (x = 0; x < ctxcanvas->canvas->w; x++)
+      {
+        p = XGetPixel(img, x, y);
+        
+        if (p)
+        {
+          if (x < *xmin) *xmin = x; 
+          if (x > *xmax) *xmax = x; 
+          if (y < *ymin) *ymin = y; 
+          if (y > *ymax) *ymax = y; 
+          break;
+        }
+      }
+      
+      if (x != ctxcanvas->canvas->w-1)
+      {
+        for (x = ctxcanvas->canvas->w-1; x >= 0; x--)
+        {
+          p = XGetPixel(img, x, y);
+        
+          if (p)
+          {
+            if (x < *xmin) *xmin = x; 
+            if (x > *xmax) *xmax = x; 
+            if (y < *ymin) *ymin = y; 
+            if (y > *ymax) *ymax = y; 
+            break;
+          }
+        }
+      }
+    }
+
+    XDestroyImage(img);
+  }
+}
+
+static void sPrepareRegion(cdCtxCanvas *ctxcanvas)
+{
+  if (!ctxcanvas->new_region)
+    return;
+
+  XSetFunction(ctxcanvas->dpy, ctxcanvas->region_aux_gc, GXcopy);
+  XSetForeground(ctxcanvas->dpy, ctxcanvas->region_aux_gc, 0);
+  XFillRectangle(ctxcanvas->dpy, ctxcanvas->region_aux, ctxcanvas->region_aux_gc, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h);
+  XSetForeground(ctxcanvas->dpy, ctxcanvas->region_aux_gc, 1);
+}
+
+static void sCombineRegion(cdCtxCanvas *ctxcanvas)
+{
+  switch(ctxcanvas->canvas->combine_mode)
+  {                          
+  case CD_UNION:
+    XSetFunction(ctxcanvas->dpy, ctxcanvas->region_aux_gc, GXor);
+    break;
+  case CD_INTERSECT:   
+    XSetFunction(ctxcanvas->dpy, ctxcanvas->region_aux_gc, GXand);
+    break;
+  case CD_DIFFERENCE:           
+    XSetFunction(ctxcanvas->dpy, ctxcanvas->region_aux_gc, GXandInverted);
+    break;
+  case CD_NOTINTERSECT:
+    XSetFunction(ctxcanvas->dpy, ctxcanvas->region_aux_gc, GXxor);
+    break;
+  }
+  
+  XCopyArea(ctxcanvas->dpy, ctxcanvas->region_aux, ctxcanvas->new_region, ctxcanvas->region_aux_gc,
+            0, 0,
+            ctxcanvas->canvas->w, ctxcanvas->canvas->h,
+            0, 0);  
+}
+
+static void cdoffsetregion(cdCtxCanvas *ctxcanvas, int x, int y)
+{
+  if (!ctxcanvas->new_region)
+    return;
+    
+  sPrepareRegion(ctxcanvas);    
+
+  XCopyArea(ctxcanvas->dpy, ctxcanvas->new_region, ctxcanvas->region_aux, ctxcanvas->region_aux_gc,
+            0, 0,
+            ctxcanvas->canvas->w-x, ctxcanvas->canvas->h-y,
+            x, y);  
+  
+  XCopyArea(ctxcanvas->dpy, ctxcanvas->region_aux, ctxcanvas->new_region, ctxcanvas->region_aux_gc,
+            0, 0,
+            ctxcanvas->canvas->w, ctxcanvas->canvas->h,
+            0, 0);  
+}
+
+/******************************************************/
+
+static int cdwritemode(cdCtxCanvas *ctxcanvas, int write_mode)
+{
+  switch (write_mode)
+  {
+  case CD_REPLACE:
+    XSetFunction(ctxcanvas->dpy, ctxcanvas->gc, GXcopy);
+    break;
+  case CD_XOR:
+    XSetFunction(ctxcanvas->dpy, ctxcanvas->gc, GXxor);
+    break;
+  case CD_NOT_XOR:
+    XSetFunction(ctxcanvas->dpy, ctxcanvas->gc, GXequiv);
+    break;
+  }
+
+  return write_mode;
+}
+
+static int cdinteriorstyle(cdCtxCanvas *ctxcanvas, int style)
+{
+  int sty = FillSolid;
+
+  switch (style)
+  {
+    case CD_SOLID:
+      sty = FillSolid;
+      break;
+    case CD_HATCH :
+      if (!ctxcanvas->last_hatch) 
+        return ctxcanvas->canvas->interior_style;
+
+      XSetStipple(ctxcanvas->dpy, ctxcanvas->gc, ctxcanvas->last_hatch);
+
+      if (ctxcanvas->canvas->back_opacity == CD_OPAQUE)
+        sty = FillOpaqueStippled;
+      else
+        sty = FillStippled;
+      break;
+    case CD_STIPPLE:
+      XSetStipple(ctxcanvas->dpy, ctxcanvas->gc, ctxcanvas->last_stipple);
+
+      if (ctxcanvas->canvas->back_opacity == CD_OPAQUE)
+        sty = FillOpaqueStippled;
+      else
+        sty = FillStippled;
+      break;
+    case CD_PATTERN:
+      XSetTile(ctxcanvas->dpy, ctxcanvas->gc, ctxcanvas->last_pattern);
+      sty = FillTiled;
+      break;
+  }
+
+  XSetFillStyle(ctxcanvas->dpy, ctxcanvas->gc, sty);
+
+  return style;
+}
+
+static int cdhatch(cdCtxCanvas *ctxcanvas, int hatch_style)
+{
+  if (ctxcanvas->last_hatch)
+    XFreePixmap(ctxcanvas->dpy, ctxcanvas->last_hatch);
+
+  ctxcanvas->last_hatch = XCreatePixmapFromBitmapData(ctxcanvas->dpy,
+                          ctxcanvas->wnd, hatches[hatch_style],
+                          HATCH_WIDTH, HATCH_HEIGHT, 1, 0, 1);
+
+  cdinteriorstyle(ctxcanvas, CD_HATCH);
+
+  return hatch_style;
+}
+
+static void cdstipple(cdCtxCanvas *ctxcanvas, int w, int h, const unsigned char *data)
+{
+  int x, y;
+
+  if (ctxcanvas->last_stipple == 0 || (ctxcanvas->last_stipple_w != w || ctxcanvas->last_stipple_h != h))
+  {
+    if (ctxcanvas->last_stipple != 0)
+    {
+      XFreePixmap(ctxcanvas->dpy, ctxcanvas->last_stipple);
+      XFreeGC(ctxcanvas->dpy, ctxcanvas->last_stipple_gc); 
+    }
+
+    ctxcanvas->last_stipple = XCreatePixmap(ctxcanvas->dpy,ctxcanvas->wnd,w,h,1);
+    if (!ctxcanvas->last_stipple) return;
+    ctxcanvas->last_stipple_gc = XCreateGC(ctxcanvas->dpy, ctxcanvas->last_stipple, 0, 0);
+    ctxcanvas->last_stipple_w = w;
+    ctxcanvas->last_stipple_h = h;
+  }
+
+  for (y=0; y<h; y++)
+  {
+    for (x=0; x<w; x++)
+    {
+      XSetForeground(ctxcanvas->dpy, ctxcanvas->last_stipple_gc, data[y*w+x]? 1: 0);
+      XDrawPoint(ctxcanvas->dpy, ctxcanvas->last_stipple, ctxcanvas->last_stipple_gc, x, h-y-1);
+    }
+  }
+
+  cdinteriorstyle(ctxcanvas, CD_STIPPLE);
+}
+
+static int find_match(unsigned long* palette, int pal_size, unsigned long color, unsigned char *match)
+{
+  int i;
+
+  for (i=0;i<pal_size;i++)
+  {
+    if (palette[i] == color)
+    {
+      *match = (unsigned char)i;
+      return 1;
+    }
+  }
+
+  return 0;
+}
+
+static void cdpattern(cdCtxCanvas *ctxcanvas, int w, int h, const long int *colors)
+{
+  int x, y, i;
+  int size = w*h;
+  unsigned long *pixels;
+
+  if (ctxcanvas->last_pattern == 0 || (ctxcanvas->last_pattern_w != w || ctxcanvas->last_pattern_h != h))
+  {
+    if (ctxcanvas->last_pattern != 0)
+    {
+      XFreePixmap(ctxcanvas->dpy, ctxcanvas->last_pattern);
+      XFreeGC(ctxcanvas->dpy, ctxcanvas->last_pattern_gc); 
+    }
+
+    ctxcanvas->last_pattern = XCreatePixmap(ctxcanvas->dpy,ctxcanvas->wnd,w,h,ctxcanvas->depth);
+    if (!ctxcanvas->last_pattern) return;
+    ctxcanvas->last_pattern_gc = XCreateGC(ctxcanvas->dpy, ctxcanvas->last_pattern, 0, 0);
+    ctxcanvas->last_pattern_w = w;
+    ctxcanvas->last_pattern_h = h;
+  }
+
+  pixels = (unsigned long*)malloc(w*h*sizeof(long));
+
+  if (ctxcanvas->canvas->bpp <= 8)
+  {
+    long int match_table[256];    /* X  colors */
+    unsigned long palette[256];   /* CD colors */
+    unsigned char *index = (unsigned char*)malloc(size), match;
+    int pal_size = 1;
+    palette[0] = colors[0];
+
+    /* encontra as n primeiras cores diferentes da imagem (ate 256) */
+    for(i=0;i<size;i++)
+    {
+      if (!find_match(palette, pal_size, colors[i], &match))
+      {
+         palette[pal_size] = colors[i];
+         index[i] = (unsigned char)pal_size;
+         pal_size++;
+
+         if (pal_size == 256)
+           break;
+      }
+      else
+        index[i] = match;
+    }
+
+    /* de cores do CD para cores do X */
+    for (i = 0; i < pal_size; i++)
+      match_table[i] = cdxGetPixel(ctxcanvas, palette[i]);
+
+    /* de imagem do CD para imagem do X */
+    for(i=0;i<size;i++)
+      pixels[i] = match_table[index[i]];
+
+    free(index);
+  }
+  else
+  {
+    for(i=0;i<size;i++)
+      pixels[i] = cdxGetPixel(ctxcanvas, colors[i]);
+  }
+
+  for (y=0; y<h; y++)
+  {
+    for (x=0; x<w; x++)
+    {
+      XSetForeground(ctxcanvas->dpy, ctxcanvas->last_pattern_gc, pixels[y*w+x]);
+      XDrawPoint(ctxcanvas->dpy, ctxcanvas->last_pattern, ctxcanvas->last_pattern_gc, x, h-y-1);
+    }
+  }
+
+  cdinteriorstyle(ctxcanvas, CD_PATTERN);
+
+  free(pixels);
+}
+
+static int cdlinestyle(cdCtxCanvas *ctxcanvas, int style)
+{
+  switch (style)
+  {
+  case CD_CONTINUOUS:
+    gcval.line_style = LineSolid;
+    break;
+  case CD_DASHED:
+  case CD_DOTTED:
+  case CD_DASH_DOT:
+  case CD_DASH_DOT_DOT:
+    {
+      static struct {
+        int size;
+        char list[6];
+      } dashes[4] = {
+        { 2, { 6, 2 } },
+        { 2, { 2, 2 } },
+        { 4, { 6, 2, 2, 2 } },
+        { 6, { 6, 2, 2, 2, 2, 2 } }
+      };
+
+      if (ctxcanvas->canvas->back_opacity == CD_OPAQUE)
+        gcval.line_style = LineDoubleDash;
+      else
+        gcval.line_style = LineOnOffDash;
+        
+      XSetDashes(ctxcanvas->dpy, ctxcanvas->gc, 0, dashes[style-CD_DASHED].list,
+                 dashes[style-CD_DASHED].size);
+      break;
+    }
+  case CD_CUSTOM:        
+    {
+      int i;
+      char* dash_style = (char*)malloc(ctxcanvas->canvas->line_dashes_count);
+      for (i = 0; i < ctxcanvas->canvas->line_dashes_count; i++)
+        dash_style[i] = (char)ctxcanvas->canvas->line_dashes[i];
+
+      if (ctxcanvas->canvas->back_opacity == CD_OPAQUE)
+        gcval.line_style = LineDoubleDash;
+      else
+        gcval.line_style = LineOnOffDash;
+
+      XSetDashes(ctxcanvas->dpy, ctxcanvas->gc, 0, dash_style,
+                 ctxcanvas->canvas->line_dashes_count);
+      free(dash_style);
+      break;
+    }
+  }
+  XChangeGC(ctxcanvas->dpy, ctxcanvas->gc, GCLineStyle, &gcval);
+  return style;
+}
+
+static int cdlinewidth(cdCtxCanvas *ctxcanvas, int width)
+{
+  if (width == 1) 
+    gcval.line_width = 0;
+  else
+    gcval.line_width = width;
+
+  XChangeGC(ctxcanvas->dpy, ctxcanvas->gc, GCLineWidth, &gcval);
+
+  return width;
+}
+
+static int cdlinecap(cdCtxCanvas *ctxcanvas, int cap)
+{
+  int cd2x_cap[] =  {CapButt, CapProjecting, CapRound};
+  
+  gcval.cap_style = cd2x_cap[cap];
+  XChangeGC(ctxcanvas->dpy, ctxcanvas->gc, GCCapStyle, &gcval);
+
+  return cap;
+}
+
+static int cdlinejoin(cdCtxCanvas *ctxcanvas, int join)
+{
+  int cd2x_join[] = {JoinMiter, JoinBevel, JoinRound};
+  
+  gcval.join_style = cd2x_join[join];
+  XChangeGC(ctxcanvas->dpy, ctxcanvas->gc, GCJoinStyle, &gcval);
+
+  return join;
+}
+
+static int cdbackopacity(cdCtxCanvas *ctxcanvas, int opaque)
+{
+  ctxcanvas->canvas->back_opacity = opaque;
+  cdinteriorstyle(ctxcanvas, ctxcanvas->canvas->interior_style);
+  cdlinestyle(ctxcanvas, ctxcanvas->canvas->line_style);
+  return opaque;
+}
+
+static int cdxGetFontSize(char* font_name)
+{
+  int i = 0;
+  while (i < 8)
+  {
+    font_name = strchr(font_name, '-')+1;
+    i++;
+  }
+
+  *(strchr(font_name, '-')) = 0;
+  return atoi(font_name);
+}
+
+static int cdfont(cdCtxCanvas *ctxcanvas, const char *type_face, int style, int size)
+{
+  XFontStruct *font;
+  char **font_names_list;
+  char font_name[1024];
+  char* foundry = "*";
+  int i, num_fonts, font_size, near_size, change_italic = 0;
+
+  /* no underline or strikeout support */
+
+  static char * type[] = 
+  {
+    "medium-r",  /* CD_PLAIN */
+    "bold-r",    /* CD_BOLD */
+    "medium-i",  /* CD_ITALIC */
+    "bold-i"     /* CD_BOLD_ITALIC */
+  };
+
+  if (cdStrEqualNoCase(type_face, "System"))
+    type_face = "fixed";
+  else if (cdStrEqualNoCase(type_face, "Monospace") || cdStrEqualNoCase(type_face, "Courier New"))
+    type_face = "courier";
+  else if (cdStrEqualNoCase(type_face, "Serif") || cdStrEqualNoCase(type_face, "Times New Roman"))
+    type_face = "times";
+  else if (cdStrEqualNoCase(type_face, "Sans") || cdStrEqualNoCase(type_face, "Arial"))
+    type_face = "helvetica";
+
+  if (cdStrEqualNoCase(type_face, "Fixed"))
+    foundry = "misc";
+
+  sprintf(font_name,"-%s-%s-%s-*-*-*-*-*-*-*-*-*-*", foundry, type_face, type[style&3]);
+
+  font_names_list = XListFonts(ctxcanvas->dpy, font_name, 32767, &num_fonts);
+  if (!num_fonts)
+  {
+    /* try changing 'i' to 'o', for italic */
+    if (style&CD_ITALIC)
+    {
+      change_italic = 1;
+      strstr(font_name, "-i-")[1] = 'o';
+      font_names_list = XListFonts(ctxcanvas->dpy, font_name, 32767, &num_fonts);
+    }
+
+    if (!num_fonts)
+      return 0;
+  }
+
+  size = cdGetFontSizePoints(ctxcanvas->canvas, size);
+
+  size *= 10; /* convert to deci-points */
+
+  near_size = -1000;
+  for (i=0; i<num_fonts; i++)
+  {
+    font_size = cdxGetFontSize(font_names_list[i]);
+
+    if (font_size == size)
+    {
+      near_size = font_size;
+      break;
+    }
+
+    if (abs(font_size-size) < abs(near_size-size))
+      near_size = font_size;
+  }
+
+  XFreeFontNames(font_names_list);
+
+  sprintf(font_name,"-%s-%s-%s-*-*-*-%d-*-*-*-*-*-*", foundry, type_face, type[style&3], near_size);
+  if (change_italic) strstr(font_name, "-i-")[1] = 'o';
+
+  font = XLoadQueryFont(ctxcanvas->dpy, font_name);
+  if (!font)
+    return 0;
+
+  if (ctxcanvas->font) 
+    XFreeFont(ctxcanvas->dpy, ctxcanvas->font);
+
+  ctxcanvas->font = font;
+  XSetFont(ctxcanvas->dpy, ctxcanvas->gc, ctxcanvas->font->fid);
+  return 1;
+}
+
+static int cdnativefont(cdCtxCanvas *ctxcanvas, const char* nativefont)
+{
+  int size = 12, style = CD_PLAIN;
+  char type_face[1024];
+
+  if (nativefont[0] == '-')
+  {
+    XFontStruct *font = XLoadQueryFont(ctxcanvas->dpy, nativefont);
+    if (!font)
+      return 0;
+
+    if (!cdParseXWinFont(nativefont, type_face, &style, &size))
+    {
+      XFreeFont(ctxcanvas->dpy, font);
+      return 0;
+    }
+
+    if (ctxcanvas->font) XFreeFont(ctxcanvas->dpy, ctxcanvas->font);
+    ctxcanvas->font = font;
+    XSetFont(ctxcanvas->dpy, ctxcanvas->gc, ctxcanvas->font->fid);
+  }
+  else
+  {
+    if (!cdParsePangoFont(nativefont, type_face, &style, &size))
+      return 0;
+
+    if (!cdfont(ctxcanvas, type_face, style, size))
+      return 0;
+  }
+
+  /* update cdfont parameters */
+  ctxcanvas->canvas->font_style = style;
+  ctxcanvas->canvas->font_size = size;
+  strcpy(ctxcanvas->canvas->font_type_face, type_face);
+
+  return 1;
+}
+
+static void cdgetfontdim(cdCtxCanvas *ctxcanvas, int *max_width, int *height, int *ascent, int *descent)
+{
+  if (!ctxcanvas->font) return;
+  if (max_width) *max_width = ctxcanvas->font->max_bounds.width;
+  if (height)    *height    = ctxcanvas->font->ascent + ctxcanvas->font->descent;
+  if (ascent)    *ascent    = ctxcanvas->font->ascent;
+  if (descent)   *descent   = ctxcanvas->font->descent;
+}
+
+static long int cdbackground(cdCtxCanvas *ctxcanvas, long int color)
+{
+  XSetBackground(ctxcanvas->dpy, ctxcanvas->gc, cdxGetPixel(ctxcanvas, color));
+  return color;
+}
+
+static long int cdforeground(cdCtxCanvas *ctxcanvas, long int color)
+{          
+  ctxcanvas->fg = cdxGetPixel(ctxcanvas, color);
+  XSetForeground(ctxcanvas->dpy, ctxcanvas->gc, ctxcanvas->fg);
+  return color;
+}
+
+static void cdpalette(cdCtxCanvas *ctxcanvas, int n, const long int *palette, int mode)
+{
+  unsigned long pixels[256];
+  int i;
+
+  for(i = 0; i < ctxcanvas->num_colors; i++)
+    pixels[i] = ctxcanvas->color_table[i].pixel;
+
+  XFreeColors(ctxcanvas->dpy, ctxcanvas->colormap, pixels, ctxcanvas->num_colors, 0);
+
+  if (mode == CD_FORCE)
+  {
+    XColor xc;
+    int tokeep;
+
+    /* se antes era POLITE aloca palette propria */
+    if (ctxcanvas->colormap == DefaultColormap(ctxcanvas->dpy, ctxcanvas->scr))
+      ctxcanvas->colormap = XCreateColormap(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->vis, AllocNone);
+
+    /* se for FORCE ira' alocar todas as cores, 
+       mas se o numero de cores desejado e' menor que o maximo
+       entao uso a diferenca para preservar as primeiras cores alocadas no colormap default. */
+    tokeep = ctxcanvas->num_colors - n;
+    if (tokeep)
+    {
+      for (i=0; i<tokeep; i++) 
+        ctxcanvas->color_table[i].pixel=i;
+
+      XQueryColors(ctxcanvas->dpy, DefaultColormap(ctxcanvas->dpy, ctxcanvas->scr), ctxcanvas->color_table, tokeep);
+
+      /* reservo estas cores para o CD tambem */
+      for (i=0; i<tokeep; i++)
+        XAllocColor(ctxcanvas->dpy, ctxcanvas->colormap, &(ctxcanvas->color_table[i])); 
+    }
+
+    /*aloco todas as cores da palette para o CD */
+    for (i=0; i<n; i++)
+    {
+      xc.red = cdCOLOR8TO16(cdRed(palette[i]));
+      xc.green = cdCOLOR8TO16(cdGreen(palette[i]));
+      xc.blue = cdCOLOR8TO16(cdBlue(palette[i]));
+      xc.flags = DoRed | DoGreen | DoBlue;
+      XAllocColor(ctxcanvas->dpy, ctxcanvas->colormap, &xc); 
+    }
+
+    /* atualizo toda a tabela de cores */
+    XSetWindowColormap(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->colormap);
+    update_colors(ctxcanvas);
+  }
+  else
+  {
+    /* se antes era FORCE, remove palette propria */
+    if (ctxcanvas->colormap != DefaultColormap(ctxcanvas->dpy, ctxcanvas->scr))
+    {
+      XFreeColormap(ctxcanvas->dpy, ctxcanvas->colormap);
+      ctxcanvas->colormap = DefaultColormap(ctxcanvas->dpy, ctxcanvas->scr);
+    }
+
+    /* atualizo a tabela antes de acrescentar novas cores afinal liberamos todas as que podiamos antes disso */
+    update_colors(ctxcanvas);
+
+    /* se for POLITE apenas tento alocar todas as cores da palette */
+    for (i=0; i<n; i++)
+      cdxGetPixel(ctxcanvas, palette[i]);
+  }
+}
+
+/******************************************************/
+
+static void cdxCheckSolidStyle(cdCtxCanvas *ctxcanvas, int set)
+{
+  if (ctxcanvas->canvas->interior_style == CD_SOLID)
+    return;
+
+  if (set)
+    XSetFillStyle(ctxcanvas->dpy, ctxcanvas->gc, FillSolid);
+  else
+    cdinteriorstyle(ctxcanvas, ctxcanvas->canvas->interior_style);
+}
+
+static void cdclear(cdCtxCanvas* ctxcanvas)
+{
+  cdxCheckSolidStyle(ctxcanvas, 1);
+  XSetForeground(ctxcanvas->dpy, ctxcanvas->gc, cdxGetPixel(ctxcanvas, ctxcanvas->canvas->background));
+  XFillRectangle(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, 0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h);
+  XSetForeground(ctxcanvas->dpy, ctxcanvas->gc, cdxGetPixel(ctxcanvas, ctxcanvas->canvas->foreground));
+  cdxCheckSolidStyle(ctxcanvas, 0);
+}
+
+static void cdline(cdCtxCanvas *ctxcanvas, int x1, int y1, int x2, int y2)
+{ 
+  if (ctxcanvas->canvas->use_matrix)
+  {
+    cdMatrixTransformPoint(ctxcanvas->xmatrix, x1, y1, &x1, &y1);
+    cdMatrixTransformPoint(ctxcanvas->xmatrix, x2, y2, &x2, &y2);
+  }
+
+  cdxCheckSolidStyle(ctxcanvas, 1);
+  XDrawLine(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, x1, y1, x2, y2);
+  cdxCheckSolidStyle(ctxcanvas, 0);
+}
+
+static void cdarc(cdCtxCanvas *ctxcanvas, int xc, int yc, int w, int h, double a1, double a2)
+{
+  if (ctxcanvas->canvas->use_matrix)
+  {
+    cdarcSIM(ctxcanvas, xc, yc, w, h, a1, a2);
+    return;
+  }
+
+  cdxCheckSolidStyle(ctxcanvas, 1);
+  XDrawArc(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, xc-w/2, yc-h/2, w, h, cdRound(a1*64), cdRound((a2 - a1)*64));
+  cdxCheckSolidStyle(ctxcanvas, 0);
+}
+
+static void cdsector(cdCtxCanvas *ctxcanvas, int xc, int yc, int w, int h, double a1, double a2)
+{
+  if (ctxcanvas->canvas->use_matrix)
+  {
+    cdsectorSIM(ctxcanvas, xc, yc, w, h, a1, a2);
+    return;
+  }
+
+  if (ctxcanvas->canvas->new_region)
+  {
+    sPrepareRegion(ctxcanvas);
+    XSetArcMode(ctxcanvas->dpy, ctxcanvas->region_aux_gc, ArcPieSlice);
+    XFillArc(ctxcanvas->dpy, ctxcanvas->region_aux, ctxcanvas->region_aux_gc, xc-w/2, yc-h/2, w, h, cdRound(a1*64), cdRound((a2 - a1)*64));
+    sCombineRegion(ctxcanvas);
+  }
+  else
+  {
+    XSetArcMode(ctxcanvas->dpy, ctxcanvas->gc, ArcPieSlice);
+    XFillArc(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, xc-w/2, yc-h/2, w, h, cdRound(a1*64), cdRound((a2 - a1)*64));
+  }
+}
+
+static void cdchord(cdCtxCanvas *ctxcanvas, int xc, int yc, int w, int h, double a1, double a2)
+{
+  if (ctxcanvas->canvas->use_matrix)
+  {
+    cdchordSIM(ctxcanvas, xc, yc, w, h, a1, a2);
+    return;
+  }
+
+  if (ctxcanvas->canvas->new_region)
+  {
+    sPrepareRegion(ctxcanvas);
+    XSetArcMode(ctxcanvas->dpy, ctxcanvas->region_aux_gc, ArcChord);
+    XFillArc(ctxcanvas->dpy, ctxcanvas->region_aux, ctxcanvas->region_aux_gc, xc-w/2, yc-h/2, w, h, cdRound(a1*64), cdRound((a2 - a1)*64));
+    sCombineRegion(ctxcanvas);
+  }
+  else
+  {
+    XSetArcMode(ctxcanvas->dpy, ctxcanvas->gc, ArcChord);
+    XFillArc(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, xc-w/2, yc-h/2, w, h, cdRound(a1*64), cdRound((a2 - a1)*64));
+  }
+}
+
+static void cdrect(cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax)
+{
+  if (ctxcanvas->canvas->use_matrix)
+  {
+    cdrectSIM(ctxcanvas, xmin, xmax, ymin, ymax);
+    return;
+  }
+
+  cdxCheckSolidStyle(ctxcanvas, 1);
+  XDrawRectangle(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, xmin, ymin, xmax-xmin, ymax-ymin);
+  cdxCheckSolidStyle(ctxcanvas, 0);
+}
+
+static void cdbox(cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax)
+{
+  if (ctxcanvas->canvas->use_matrix)
+  {
+    cdboxSIM(ctxcanvas, xmin, xmax, ymin, ymax);
+    return;
+  }
+
+  if (ctxcanvas->canvas->new_region)
+  {
+    sPrepareRegion(ctxcanvas);
+    XFillRectangle(ctxcanvas->dpy, ctxcanvas->region_aux, ctxcanvas->region_aux_gc, xmin, ymin, xmax-xmin+1, ymax-ymin+1);
+    sCombineRegion(ctxcanvas);
+  }
+  else
+    XFillRectangle(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, xmin, ymin, xmax-xmin+1, ymax-ymin+1);
+}
+
+static int cd2xvertex [12] = {XR_TCENTRE, XR_BCENTRE, 
+                              XR_MRIGHT,  XR_MLEFT, 
+                              XR_TRIGHT,  XR_TLEFT, 
+                              XR_BRIGHT,  XR_BLEFT, 
+                              XR_MCENTRE, XR_LEFT, 
+                              XR_CENTRE,  XR_RIGHT};
+
+static void cdtext(cdCtxCanvas *ctxcanvas, int x, int y, const char *s)
+{
+  int w, h, n, dir = -1;
+
+  if (ctxcanvas->canvas->text_orientation != 0)
+  {
+    cdxCheckSolidStyle(ctxcanvas, 1);
+  
+    if (ctxcanvas->canvas->use_matrix)
+      cdMatrixTransformPoint(ctxcanvas->xmatrix, x, y, &x, &y);
+
+    if (ctxcanvas->canvas->new_region)
+    {
+      sPrepareRegion(ctxcanvas);
+      XRotDrawString(ctxcanvas->dpy, ctxcanvas->font, ctxcanvas->canvas->text_orientation, 
+                     ctxcanvas->region_aux, ctxcanvas->region_aux_gc, x, y, s, 
+                     cd2xvertex[ctxcanvas->canvas->text_alignment], 0);
+      sCombineRegion(ctxcanvas);
+    }
+    else
+      XRotDrawString(ctxcanvas->dpy, ctxcanvas->font, ctxcanvas->canvas->text_orientation, 
+                     ctxcanvas->wnd, ctxcanvas->gc, x, y, s, 
+                     cd2xvertex[ctxcanvas->canvas->text_alignment], 0);
+
+    cdxCheckSolidStyle(ctxcanvas, 0);
+      
+    return;
+  }
+
+  n = strlen(s);
+  w = XTextWidth(ctxcanvas->font, s, n);
+  h = ctxcanvas->font->ascent + ctxcanvas->font->descent;
+
+  switch (ctxcanvas->canvas->text_alignment)
+  {
+  case CD_BASE_RIGHT:
+  case CD_NORTH_EAST:
+  case CD_EAST:
+  case CD_SOUTH_EAST:
+    x = x - w;    
+    break;
+  case CD_BASE_CENTER:
+  case CD_CENTER:
+  case CD_NORTH:
+  case CD_SOUTH:
+    x = x - w/2;  
+    break;
+  case CD_BASE_LEFT:
+  case CD_NORTH_WEST:
+  case CD_WEST:
+  case CD_SOUTH_WEST:
+    x = x;         
+    break;
+  }
+
+  if (ctxcanvas->canvas->invert_yaxis)
+    dir = 1;
+
+  switch (ctxcanvas->canvas->text_alignment)
+  {
+  case CD_BASE_LEFT:
+  case CD_BASE_CENTER:
+  case CD_BASE_RIGHT:
+    y = y;
+    break;
+  case CD_SOUTH_EAST:
+  case CD_SOUTH_WEST:
+  case CD_SOUTH:
+    y = y - dir*ctxcanvas->font->descent;
+    break;
+  case CD_NORTH_EAST:
+  case CD_NORTH:
+  case CD_NORTH_WEST:
+    y = y + dir*(h - ctxcanvas->font->descent);
+    break;
+  case CD_CENTER:
+  case CD_EAST:
+  case CD_WEST:
+    y = y + dir*(h/2 - ctxcanvas->font->descent);
+    break;
+  }
+
+  cdxCheckSolidStyle(ctxcanvas, 1);
+
+  if (ctxcanvas->canvas->use_matrix)
+    cdMatrixTransformPoint(ctxcanvas->xmatrix, x, y, &x, &y);
+
+  if (ctxcanvas->canvas->new_region)
+  {
+    sPrepareRegion(ctxcanvas);
+    XSetFont(ctxcanvas->dpy, ctxcanvas->region_aux_gc, ctxcanvas->font->fid);
+    XDrawString(ctxcanvas->dpy, ctxcanvas->region_aux, ctxcanvas->region_aux_gc, x, y+1, s, n);
+    sCombineRegion(ctxcanvas);
+  }
+  else
+    XDrawString(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, x, y+1, s, n);
+
+  cdxCheckSolidStyle(ctxcanvas, 0);
+}
+
+static void cdgettextsize(cdCtxCanvas *ctxcanvas, const char *s, int *width, int *height)
+{
+  if (!ctxcanvas->font) return;
+  if (width)  *width  = XTextWidth(ctxcanvas->font, s, strlen(s));
+  if (height) *height = ctxcanvas->font->ascent + ctxcanvas->font->descent;
+}
+
+void cdxPoly(cdCtxCanvas *ctxcanvas, int mode, cdPoint* poly, int n)
+{
+  int i;
+  XPoint* pnt = NULL;
+  
+  if (mode != CD_BEZIER)
+  {
+    pnt = (XPoint*)malloc((n+1) * sizeof(XPoint)); /* XPoint uses short for coordinates */
+    
+    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);
+      XSetFillRule(ctxcanvas->dpy, ctxcanvas->region_aux_gc, ctxcanvas->canvas->fill_mode==CD_EVENODD?EvenOddRule:WindingRule);
+      XFillPolygon(ctxcanvas->dpy, ctxcanvas->region_aux, ctxcanvas->region_aux_gc,
+                   pnt, n, Complex, CoordModeOrigin);
+      sCombineRegion(ctxcanvas);
+    }
+    else
+    {
+      XSetFillRule(ctxcanvas->dpy, ctxcanvas->gc, ctxcanvas->canvas->fill_mode==CD_EVENODD?EvenOddRule:WindingRule);
+      XFillPolygon(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc,
+                   pnt, n, Complex, CoordModeOrigin);
+    }
+    break;
+  case CD_CLOSED_LINES:
+    pnt[n].x = pnt[0].x;
+    pnt[n].y = pnt[0].y;
+    n++;
+    /* continua */
+  case CD_OPEN_LINES:
+    {
+      cdxCheckSolidStyle(ctxcanvas, 1);
+      XDrawLines(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, pnt, n, CoordModeOrigin);
+      cdxCheckSolidStyle(ctxcanvas, 0);
+      break;
+    }
+  case CD_CLIP:
+    if (ctxcanvas->clip_polygon) XFreePixmap(ctxcanvas->dpy, ctxcanvas->clip_polygon);
+    ctxcanvas->clip_polygon = build_clip_polygon(ctxcanvas, pnt, n);
+    if (ctxcanvas->canvas->clip_mode == CD_CLIPPOLYGON) cdxClip(ctxcanvas, CD_CLIPPOLYGON);
+    break;
+  case CD_BEZIER:
+    cdSimPolyBezier(ctxcanvas->canvas, poly, n);
+    break;
+  }
+
+  if (pnt) free(pnt);
+}
+
+/******************************************************/
+
+static int byte_order(void)
+{
+  unsigned short us = 0xFF00;
+  unsigned char *uc = (unsigned char *)&us;
+  return (uc[0]==0xFF) ? MSBFirst : LSBFirst;
+}
+
+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;
+  XImage *xi = XGetImage(ctxcanvas->dpy, ctxcanvas->wnd, x, y-h+1, w, h, ULONG_MAX, ZPixmap);
+  if (!xi)
+  {
+    fprintf(stderr, "CanvasDraw: error getting image\n");
+    return;
+  }
+  
+  for (lin=0; lin<h; lin++)
+  {
+    for (col=0; col<w; col++)
+    {
+      pos = (h-lin-1)*w+col;
+      cdxGetRGB(ctxcanvas, XGetPixel(xi, col, lin), r+pos, g+pos, b+pos);
+    }
+  }
+  
+  XDestroyImage(xi);
+}
+
+static long int* get_data_buffer(cdCtxCanvas *ctxcanvas, int size)
+{
+  if (!ctxcanvas->xidata)
+  {
+    ctxcanvas->xisize = size;
+    ctxcanvas->xidata = (long int *)malloc(ctxcanvas->xisize);
+  }
+  else if (ctxcanvas->xisize < size)
+  {
+    ctxcanvas->xisize = size;
+    ctxcanvas->xidata = (long int *)realloc(ctxcanvas->xidata, ctxcanvas->xisize);
+  }
+
+  if (!ctxcanvas->xidata)
+    ctxcanvas->xisize = 0;
+
+  return ctxcanvas->xidata;
+}
+  
+static XImage *map2ximage(cdCtxCanvas *ctxcanvas, int ew, int eh, const unsigned char *index, const long int * colors, int by, int bx, int bw, int bh, int iw)
+{
+  long int match_table[256];
+  int i, j, pal_size;
+  unsigned long xcol;
+  XImage *xim;
+  int *fx, *fy, src, dst;
+  unsigned char idx;
+  
+  xim = (XImage *) NULL;
+  
+  /* Como nao sabemos o tamanho da palette a priori, 
+  teremos que ver qual o maior indice usado na imagem. */
+  pal_size = 0;
+  
+  for (i=0; i<bh; i++) 
+  {
+    for (j=0; j<bw; j++) 
+    {
+      src = (i+by)*iw + j+bx;
+      idx = index[src];
+      if (idx > pal_size)
+        pal_size = idx;
+    }
+  }
+  
+  pal_size++;
+
+  for (i = 0; i < pal_size; i++)
+    match_table[i] = cdxGetPixel(ctxcanvas, colors[i]);
+
+  fx = cdGetZoomTable(ew, bw, bx);
+  fy = cdGetZoomTable(eh, bh, by);
+
+  switch (ctxcanvas->depth) 
+  {
+  case 8: 
+    {
+      unsigned char  *imagedata, *ip;
+      int imew, nullCount;
+    
+      nullCount = (4 - (ew % 4)) & 0x03;  /* # of padding bytes per line */
+      imew = ew + nullCount;
+    
+      /* Now get the image data - pad each scanline as necessary */
+      imagedata = (unsigned char*)get_data_buffer(ctxcanvas, eh * imew);
+      if (!imagedata) 
+      {
+        fprintf(stderr, "CanvasDraw: not enough memory putting image\n");
+        return NULL;
+      }
+    
+      for (i=0; i<eh; i++) 
+      {
+        ip = imagedata + (eh-1-i)*imew;
+
+        for (j=0; j<ew; j++, ip++) 
+        {
+          src = (fy[i])*iw + fx[j];
+          *ip = (unsigned char) match_table[index[src]];
+        }
+      }
+    
+      xim = XCreateImage(ctxcanvas->dpy,ctxcanvas->vis,ctxcanvas->depth,ZPixmap,0, (char *) imagedata,  ew,  eh, 32, imew);
+      if (!xim) 
+      {
+        fprintf(stderr, "CanvasDraw: not enough memory putting image\n");
+        return NULL;
+      }
+    }
+    break;
+
+  case 12:
+  case 15:
+  case 16: 
+    {
+      unsigned char *imagedata;
+      unsigned short *ip, *tip;
+    
+      /* Now get the image data - pad each scanline as necessary */
+      imagedata = (unsigned char*)get_data_buffer(ctxcanvas, 2*ew*eh);
+      if (!imagedata) 
+      {
+        fprintf(stderr, "CanvasDraw: not enough memory putting image\n");
+        return NULL;
+      }
+    
+      xim = XCreateImage(ctxcanvas->dpy,ctxcanvas->vis,ctxcanvas->depth,ZPixmap,0, (char *) imagedata,  ew,  eh, 16, 0);
+      if (!xim) 
+      {
+        fprintf(stderr, "CanvasDraw: not enough memory putting image\n");
+        return NULL;
+      }
+    
+      if (ctxcanvas->depth == 12 && xim->bits_per_pixel != 16) 
+      {
+        xim->data = NULL;
+        XDestroyImage(xim);
+        fprintf(stderr,"No code for this type of display (depth=%d, bperpix=%d)", ctxcanvas->depth, xim->bits_per_pixel);
+        return NULL;
+      }
+    
+      ip = (unsigned short*)(imagedata + (eh-1)*xim->bytes_per_line);
+
+      for (i=0; i<eh; i++) 
+      {
+        for (j=0, tip=ip; j<ew; j++) 
+        {
+          src = (fy[i])*iw + fx[j];
+          xcol = match_table[index[src]];
+          
+          if (xim->byte_order == MSBFirst) 
+          {
+            *tip++ = (unsigned short)(xcol & 0xffff);
+          }
+          else
+          {
+            /*  WAS *tip++ = ((xcol>>8) & 0xff) | ((xcol&0xff) << 8);  */
+            *tip++ = (unsigned short)(xcol);
+          }
+        }
+
+        ip -= ew;
+      }
+    }
+    break;
+
+  case 24:
+  case 32: 
+    {
+      unsigned char  *imagedata, *ip, *tip;
+      int do32;
+    
+      /* Now get the image data - pad each scanline as necessary */
+      imagedata = (unsigned char*)get_data_buffer(ctxcanvas, 4*ew*eh);
+      if (!imagedata) 
+      {
+        fprintf(stderr, "CanvasDraw: not enough memory putting image\n");
+        return NULL;
+      }
+    
+      xim = XCreateImage(ctxcanvas->dpy,ctxcanvas->vis,ctxcanvas->depth,ZPixmap,0, (char *) imagedata,  ew,  eh, 32, 0);
+      if (!xim) 
+      {
+        fprintf(stderr, "CanvasDraw: not enough memory putting image\n");
+        return NULL;
+      }
+    
+      do32 = (xim->bits_per_pixel == 32? 1: 0);
+    
+      ip = imagedata + (eh-1)*xim->bytes_per_line;
+
+      for (i=0; i<eh; i++) 
+      {
+        for (j=0, tip=ip; j<ew; j++) 
+        {
+          src = (fy[i])*iw + fx[j];
+          xcol = match_table[index[src]];
+        
+          if (xim->byte_order == MSBFirst) 
+          {
+            if (do32) *tip++ = 0;
+            *tip++ = (unsigned char)((xcol>>16) & 0xff);
+            *tip++ = (unsigned char)((xcol>>8)  & 0xff);
+            *tip++ = (unsigned char)( xcol      & 0xff);
+          }
+          else 
+          {  /* LSBFirst */
+            *tip++ = (unsigned char)( xcol      & 0xff);
+            *tip++ = (unsigned char)((xcol>>8)  & 0xff);
+            *tip++ = (unsigned char)((xcol>>16) & 0xff);
+            if (do32) *tip++ = 0;
+          }
+        }
+
+        ip -= xim->bytes_per_line;
+      }
+    }
+    break;
+  default: 
+    {
+      /* Now get the image data - pad each scanline as necessary */
+      unsigned long* imagedata = (unsigned long*)get_data_buffer(ctxcanvas, 4*ew*eh);
+      if (!imagedata) 
+      {
+        fprintf(stderr, "CanvasDraw: not enough memory putting image\n");
+        return NULL;
+      }
+    
+      xim = XCreateImage(ctxcanvas->dpy,ctxcanvas->vis,ctxcanvas->depth,ZPixmap,0, (char *) imagedata,  ew,  eh, 32, ew*4);
+      if (!xim) 
+      {
+        fprintf(stderr, "CanvasDraw: not enough memory putting image\n");
+        return NULL;
+      }
+    
+      xim->bits_per_pixel = 32;
+      xim->bytes_per_line = 4 * iw;
+      xim->byte_order = byte_order();
+      xim->bitmap_bit_order = MSBFirst;
+
+      for (i=0; i<eh; i++) 
+      {
+        for (j=0; j<ew; j++) 
+        {
+          src = (fy[i])*iw + fx[j];
+          dst = (eh-1 - i)*ew + j;
+          imagedata[dst] = match_table[index[src]];
+        }
+      }
+    }
+    break;
+  }
+  
+  free(fx);
+  free(fy);
+
+  return(xim);
+}
+
+static XImage *rgb2ximage(cdCtxCanvas *ctxcanvas, int ew, int eh, 
+                          const unsigned char *red, const unsigned char *green, const unsigned char *blue, 
+                          const unsigned char *alpha, XImage *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;
+  XImage *xim;
+  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;
+  bmask = ctxcanvas->vis->blue_mask;
+  rshift = 7 - highbit(rmask);
+  gshift = 7 - highbit(gmask);
+  bshift = 7 - highbit(bmask);
+  
+  maplen = ctxcanvas->vis->map_entries;
+  if (maplen>256) maplen=256;
+  cshift = 7 - highbit((unsigned long) (maplen-1));
+  
+  xim = XCreateImage(ctxcanvas->dpy, ctxcanvas->vis, ctxcanvas->depth, ZPixmap, 0, NULL, ew,  eh, 32, 0);
+  if (!xim) 
+  {
+    fprintf(stderr, "CanvasDraw: not enough memory putting image\n");
+    return NULL;
+  }
+  
+  bperline = xim->bytes_per_line;
+  bperpix  = xim->bits_per_pixel;
+  byte_order   = xim->byte_order;
+  
+  if (bperpix != 8 && bperpix != 16 && bperpix != 24 && bperpix != 32) 
+  {
+    XDestroyImage(xim);
+    fprintf(stderr, "CanvasDraw: bpp=%d not supported!\n", bperpix);
+    return NULL;
+  }
+  
+  imagedata = (unsigned char*)get_data_buffer(ctxcanvas, eh * bperline);
+  if (!imagedata)
+  {
+    XDestroyImage(xim);
+    fprintf(stderr, "CanvasDraw: not enough memory putting image\n");
+    return NULL;
+  }
+
+  fx = cdGetZoomTable(ew, bw, bx);
+  fy = cdGetZoomTable(eh, bh, by);
+
+  xim->data = (char *) imagedata;
+  
+  lip = imagedata + (eh-1)*bperline;
+
+  for (i=0; i<eh; i++, lip -= bperline) 
+  {
+    for (j=0, ip=lip; j<ew; j++) 
+    {
+      src = fy[i]*iw + fx[j];
+
+      if (alpha)
+      {
+        cdxGetRGB(ctxcanvas, XGetPixel(oxi, j, eh-i-1), &or, &og, &ob);
+        al = alpha[src];
+        r = CD_ALPHA_BLEND(red[src], or, al);
+        g = CD_ALPHA_BLEND(green[src], og, al);
+        b = CD_ALPHA_BLEND(blue[src], ob, al);
+      }
+      else
+      {
+        r = red[src];  
+        g = green[src];  
+        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
+      */
+
+#ifdef __cplusplus
+      if (ctxcanvas->vis->c_class == DirectColor) 
+#else
+      if (ctxcanvas->vis->class == DirectColor) 
+#endif
+      {
+        r = (unsigned long) cdxDirectColorTable[(r>>cshift) & 0xff] << cshift;
+        g = (unsigned long) cdxDirectColorTable[(g>>cshift) & 0xff] << cshift;
+        b = (unsigned long) cdxDirectColorTable[(b>>cshift) & 0xff] << cshift;
+      }
+      
+      /* shift the bits around */
+      if (rshift<0) r = r << (-rshift);
+      else r = r >> rshift;
+      
+      if (gshift<0) g = g << (-gshift);
+      else g = g >> gshift;
+      
+      if (bshift<0) b = b << (-bshift);
+      else b = b >> bshift;
+      
+      r = r & rmask;
+      g = g & gmask;
+      b = b & bmask;
+      
+      xcol = r | g | b;
+      
+      if (bperpix == 32) 
+      {
+        if (byte_order == MSBFirst) {
+          *ip++ = (unsigned char)((xcol>>24) & 0xff);
+          *ip++ = (unsigned char)((xcol>>16) & 0xff);
+          *ip++ = (unsigned char)((xcol>>8)  & 0xff);
+          *ip++ = (unsigned char)( xcol      & 0xff);
+        }
+        else 
+        {  /* LSBFirst */
+          *ip++ = (unsigned char)( xcol      & 0xff);
+          *ip++ = (unsigned char)((xcol>>8)  & 0xff);
+          *ip++ = (unsigned char)((xcol>>16) & 0xff);
+          *ip++ = (unsigned char)((xcol>>24) & 0xff);
+        }
+      }
+      else if (bperpix == 24) 
+      {
+        if (byte_order == MSBFirst) 
+        {
+          *ip++ = (unsigned char)((xcol>>16) & 0xff);
+          *ip++ = (unsigned char)((xcol>>8)  & 0xff);
+          *ip++ = (unsigned char)( xcol      & 0xff);
+        }
+        else 
+        {  /* LSBFirst */
+          *ip++ = (unsigned char)( xcol      & 0xff);
+          *ip++ = (unsigned char)((xcol>>8)  & 0xff);
+          *ip++ = (unsigned char)((xcol>>16) & 0xff);
+        }
+      }
+      else if (bperpix == 16) 
+      {
+        if (byte_order == MSBFirst) 
+        {
+          *ip++ = (unsigned char)((xcol>>8)  & 0xff);
+          *ip++ = (unsigned char)( xcol      & 0xff);
+        }
+        else {  /* LSBFirst */
+          *ip++ = (unsigned char)( xcol      & 0xff);
+          *ip++ = (unsigned char)((xcol>>8)  & 0xff);
+        }
+      }
+      else if (bperpix == 8) 
+      {
+        *ip++ =  (unsigned char)(xcol      & 0xff);
+      }
+    }
+  }
+  
+  free(fx);
+  free(fy);
+
+  return xim;
+}
+
+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,
+      t_x, t_y, dst_offset, size, nc, doff, rect[8];
+  float i_x, i_y, xfactor, yfactor;
+  unsigned char *dst_r, *dst_g, *dst_b, *dst_a = NULL;
+  double inv_matrix[6];
+
+  /* calculate the destination limits */
+  cdImageRGBCalcDstLimits(ctxcanvas->canvas, x, y, w, h, &t_xmin, &t_xmax, &t_ymin, &t_ymax, rect);
+
+  /* Setup inverse transform (use the original transform here, NOT ctxcanvas->xmatrix) */
+  cdImageRGBInitInverseTransform(w, h, xmin, xmax, ymin, ymax, &xfactor, &yfactor, ctxcanvas->canvas->matrix, inv_matrix);
+
+  /* create an image for the destination area */
+  ew = (t_xmax-t_xmin+1);
+  eh = (t_ymax-t_ymin+1); 
+  size = ew*eh;
+  nc = 3;
+  if (a) nc = 4;
+  dst_r = malloc(nc*size);
+  if (!dst_r)
+  {
+    fprintf(stderr, "CanvasDraw: no enough memory\n");
+    return;
+  }
+  dst_g = dst_r + size;
+  dst_b = dst_g + size;
+  if (a) dst_a = dst_b + size;
+  memset(dst_r, 0, nc*size);
+
+  /* for all pixels in the destiny area */
+  for(t_y = t_ymin; t_y <= t_ymax; t_y++)
+  {
+    dst_offset = (t_y-t_ymin) * ew;
+
+    for(t_x = t_xmin; t_x <= t_xmax; t_x++)
+    {
+      cdImageRGBInverseTransform(t_x, t_y, &i_x, &i_y, xfactor, yfactor, xmin, ymin, x, y, inv_matrix);
+
+      if (i_x > xmin && i_y > ymin && i_x < xmax+1 && i_y < ymax+1)
+      {
+        doff = (t_x-t_xmin) + dst_offset;
+        *(dst_r+doff) = cdBilinearInterpolation(iw, ih, r, i_x, i_y);
+        *(dst_g+doff) = cdBilinearInterpolation(iw, ih, g, i_x, i_y);
+        *(dst_b+doff) = cdBilinearInterpolation(iw, ih, b, i_x, i_y);
+        if (a) *(dst_a+doff) = cdBilinearInterpolation(iw, ih, a, i_x, i_y);
+      }
+    }
+  }
+
+  {
+    int ex = t_xmin, 
+        ey = t_ymin + eh-1;  /* XImage origin is at top-left */
+    XImage *xi, *oxi = NULL;
+    Pixmap clip_polygon, clip_mask = 0;
+    XPoint pnt[4];
+
+    /* Since the transformation used was the original transformation, */
+    /* must invert the Y axis here. */
+    ey = _cdInvertYAxis(ctxcanvas->canvas, ey);
+
+    /* use clipping to select only the transformed rectangle */
+    pnt[0].x = (short)rect[0]; pnt[0].y = (short)_cdInvertYAxis(ctxcanvas->canvas, rect[1]);
+    pnt[1].x = (short)rect[2]; pnt[1].y = (short)_cdInvertYAxis(ctxcanvas->canvas, rect[3]);
+    pnt[2].x = (short)rect[4]; pnt[2].y = (short)_cdInvertYAxis(ctxcanvas->canvas, rect[5]);
+    pnt[3].x = (short)rect[6]; pnt[3].y = (short)_cdInvertYAxis(ctxcanvas->canvas, rect[7]);
+    clip_polygon = build_clip_polygon(ctxcanvas, pnt, 4);
+
+    /* combine with the existing clipping */
+    if (ctxcanvas->canvas->clip_mode == CD_CLIPAREA || ctxcanvas->canvas->clip_mode == CD_CLIPPOLYGON)
+      clip_mask = ctxcanvas->clip_polygon;
+    else if (ctxcanvas->canvas->clip_mode == CD_CLIPREGION)
+      clip_mask = ctxcanvas->new_region;
+    XSetFunction(ctxcanvas->dpy, ctxcanvas->gc, GXand);
+    XCopyArea(ctxcanvas->dpy, clip_mask, clip_polygon, ctxcanvas->gc,
+              0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h, 0, 0);  
+    XSetClipMask(ctxcanvas->dpy, ctxcanvas->gc, clip_polygon);
+    cdwritemode(ctxcanvas, ctxcanvas->canvas->write_mode); /* reset XSetFunction */
+
+    if (a)
+    {
+      oxi = XGetImage(ctxcanvas->dpy, ctxcanvas->wnd, ex, ey, ew, eh, ULONG_MAX, ZPixmap);
+      if (!oxi)
+      {
+        fprintf(stderr, "CanvasDraw: error getting image\n");
+        free(dst_r);
+        return;
+      }
+    }
+
+    xi = rgb2ximage(ctxcanvas, ew, eh, dst_r, dst_g, dst_b, dst_a, oxi, 0, 0, ew, eh, ew);
+    if (!xi)
+      return;
+
+    XPutImage(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, xi, 0, 0, ex, ey, ew, eh);
+
+    /* reset cliping */
+    XFreePixmap(ctxcanvas->dpy, clip_polygon);
+    cdxClip(ctxcanvas, ctxcanvas->canvas->clip_mode);
+
+    xi->data = NULL;
+    XDestroyImage(xi);
+    if (oxi) XDestroyImage(oxi);
+  }
+
+  free(dst_r);
+}
+
+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,
+      t_x, t_y, dst_offset, size, doff, rect[8];
+  float i_x, i_y, xfactor, yfactor;
+  unsigned char *dst_index;
+  double inv_matrix[6];
+
+  /* calculate the destination limits */
+  cdImageRGBCalcDstLimits(ctxcanvas->canvas, x, y, w, h, &t_xmin, &t_xmax, &t_ymin, &t_ymax, rect);
+
+  /* Setup inverse transform (use the original transform here, NOT ctxcanvas->xmatrix) */
+  cdImageRGBInitInverseTransform(w, h, xmin, xmax, ymin, ymax, &xfactor, &yfactor, ctxcanvas->canvas->matrix, inv_matrix);
+
+  /* create an image for the destination area */
+  ew = (t_xmax-t_xmin+1);
+  eh = (t_ymax-t_ymin+1); 
+  size = ew*eh;
+  dst_index = malloc(size);
+  if (!dst_index)
+  {
+    fprintf(stderr, "CanvasDraw: no enough memory\n");
+    return;
+  }
+  memset(dst_index, 0, size);
+
+  /* for all pixels in the destiny area */
+  for(t_y = t_ymin; t_y <= t_ymax; t_y++)
+  {
+    dst_offset = (t_y-t_ymin) * ew;
+
+    for(t_x = t_xmin; t_x <= t_xmax; t_x++)
+    {
+      cdImageRGBInverseTransform(t_x, t_y, &i_x, &i_y, xfactor, yfactor, xmin, ymin, x, y, inv_matrix);
+
+      if (i_x > xmin && i_y > ymin && i_x < xmax+1 && i_y < ymax+1)
+      {
+        doff = (t_x-t_xmin) + dst_offset;
+        *(dst_index+doff) = cdZeroOrderInterpolation(iw, ih, index, i_x, i_y);
+      }
+    }
+  }
+
+  {
+    int ex = t_xmin, 
+        ey = t_ymin + eh-1;  /* XImage origin is at top-left */
+    XImage *xi;
+    Pixmap clip_polygon, clip_mask = 0;
+    XPoint pnt[4];
+
+    /* Since the transformation used was the original transformation, */
+    /* must invert the Y axis here. */
+    ey = _cdInvertYAxis(ctxcanvas->canvas, ey);
+
+    /* use clipping to select only the transformed rectangle */
+    pnt[0].x = (short)rect[0]; pnt[0].y = (short)_cdInvertYAxis(ctxcanvas->canvas, rect[1]);
+    pnt[1].x = (short)rect[2]; pnt[1].y = (short)_cdInvertYAxis(ctxcanvas->canvas, rect[3]);
+    pnt[2].x = (short)rect[4]; pnt[2].y = (short)_cdInvertYAxis(ctxcanvas->canvas, rect[5]);
+    pnt[3].x = (short)rect[6]; pnt[3].y = (short)_cdInvertYAxis(ctxcanvas->canvas, rect[7]);
+    clip_polygon = build_clip_polygon(ctxcanvas, pnt, 4);
+
+    /* combine with the existing clipping */
+    if (ctxcanvas->canvas->clip_mode == CD_CLIPAREA || ctxcanvas->canvas->clip_mode == CD_CLIPPOLYGON)
+      clip_mask = ctxcanvas->clip_polygon;
+    else if (ctxcanvas->canvas->clip_mode == CD_CLIPREGION)
+      clip_mask = ctxcanvas->new_region;
+    XSetFunction(ctxcanvas->dpy, ctxcanvas->gc, GXand);
+    XCopyArea(ctxcanvas->dpy, clip_mask, clip_polygon, ctxcanvas->gc,
+              0, 0, ctxcanvas->canvas->w, ctxcanvas->canvas->h, 0, 0);  
+    XSetClipMask(ctxcanvas->dpy, ctxcanvas->gc, clip_polygon);
+    cdwritemode(ctxcanvas, ctxcanvas->canvas->write_mode); /* reset XSetFunction */
+
+    xi = map2ximage(ctxcanvas, ew, eh, dst_index, colors, 0, 0, ew, eh, ew);
+    if (!xi)
+      return;
+
+    XPutImage(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, xi, 0, 0, ex, ey, ew, eh);
+
+    /* reset cliping */
+    XFreePixmap(ctxcanvas->dpy, clip_polygon);
+    cdxClip(ctxcanvas, ctxcanvas->canvas->clip_mode);
+
+    xi->data = NULL;
+    XDestroyImage(xi);
+  }
+
+  free(dst_index);
+}
+
+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;
+  int bw = iw, bh = ih, bx = 0, by = 0;
+  int rw, rh;
+  XImage *xi;
+
+  if (ctxcanvas->canvas->use_matrix)
+  {
+    cdputimagerectrgba_matrix(ctxcanvas, iw, ih, r, g, b, NULL, x, y, w, h, xmin, xmax, ymin, ymax);
+    return;
+  }
+
+  rw = xmax-xmin+1;
+  rh = ymax-ymin+1;
+  y -= (h - 1);        /* XImage origin is at top-left */
+
+  if (!cdCalcZoom(ctxcanvas->canvas->w, x, w, &ex, &ew, xmin, rw, &bx, &bw, 1))
+    return;
+  
+  if (!cdCalcZoom(ctxcanvas->canvas->h, y, h, &ey, &eh, ymin, rh, &by, &bh, 0))
+    return;
+
+  xi = rgb2ximage(ctxcanvas, ew, eh, r, g, b, NULL, NULL, by, bx, bw, bh, iw);
+  if (!xi)
+    return;
+
+  XPutImage(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, xi, 0, 0, ex, ey, ew, eh);
+
+  xi->data = NULL;
+  XDestroyImage(xi);
+}
+
+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)
+{
+  XImage *xi, *oxi;
+  int ew = w, eh = h, ex = x, ey = y;
+  int bw = iw, bh = ih, bx = 0, by = 0;
+  int rw, rh;
+
+  if (ctxcanvas->canvas->use_matrix)
+  {
+    cdputimagerectrgba_matrix(ctxcanvas, iw, ih, r, g, b, a, x, y, w, h, xmin, xmax, ymin, ymax);
+    return;
+  }
+
+  rw = xmax-xmin+1;
+  rh = ymax-ymin+1;
+  y -= (h - 1);        /* XImage origin is at top-left */
+
+  if (!cdCalcZoom(ctxcanvas->canvas->w, x, w, &ex, &ew, xmin, rw, &bx, &bw, 1))
+    return;
+  
+  if (!cdCalcZoom(ctxcanvas->canvas->h, y, h, &ey, &eh, ymin, rh, &by, &bh, 0))
+    return;
+
+  oxi = XGetImage(ctxcanvas->dpy, ctxcanvas->wnd, ex, ey, ew, eh, ULONG_MAX, ZPixmap);
+  if (!oxi)
+  {
+    fprintf(stderr, "CanvasDraw: error getting image\n");
+    return;
+  }
+
+  xi = rgb2ximage(ctxcanvas, ew, eh, r, g, b, a, oxi, by, bx, bw, bh, iw);
+  if (!xi)
+    return;
+
+  XPutImage(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, xi, 0, 0, ex, ey, ew, eh);
+
+  xi->data = NULL;
+  XDestroyImage(xi);
+  XDestroyImage(oxi);
+}
+
+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;
+  int bw = iw, bh = ih, bx = 0, by = 0;
+  int rw, rh;
+  XImage *xi;
+
+  if (ctxcanvas->canvas->use_matrix)
+  {
+    cdputimagerectmap_matrix(ctxcanvas, iw, ih, index, colors, x, y, w, h, xmin, xmax, ymin, ymax);
+    return;
+  }
+
+  rw = xmax-xmin+1;
+  rh = ymax-ymin+1;
+  y -= (h - 1);        /* XImage origin is at top-left */
+
+  if (!cdCalcZoom(ctxcanvas->canvas->w, x, w, &ex, &ew, xmin, rw, &bx, &bw, 1))
+    return;
+  
+  if (!cdCalcZoom(ctxcanvas->canvas->h, y, h, &ey, &eh, ymin, rh, &by, &bh, 0))
+    return;
+
+  xi = map2ximage(ctxcanvas, ew, eh, index, colors, by, bx, bw, bh, iw);
+  if (!xi)
+    return;
+
+  XPutImage(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, xi, 0, 0, ex, ey, ew, eh);
+
+  xi->data = NULL;
+  XDestroyImage(xi);
+}
+
+static void cdpixel(cdCtxCanvas *ctxcanvas, int x, int y, long int color)
+{
+  if (ctxcanvas->canvas->foreground != color)
+    XSetForeground(ctxcanvas->dpy, ctxcanvas->gc, cdxGetPixel(ctxcanvas, color));
+
+  if (ctxcanvas->canvas->use_matrix)
+    cdMatrixTransformPoint(ctxcanvas->xmatrix, x, y, &x, &y);
+
+  XDrawPoint(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->gc, x, y);
+
+  if (ctxcanvas->canvas->foreground != color)
+    XSetForeground(ctxcanvas->dpy, ctxcanvas->gc, ctxcanvas->fg);
+}
+
+static cdCtxImage *cdcreateimage (cdCtxCanvas *ctxcanvas, int w, int h)
+{
+  GC gc;
+  cdCtxImage *ctximage = (cdCtxImage *)malloc(sizeof(cdCtxImage));
+
+  ctximage->w = w;
+  ctximage->h = h;
+  ctximage->depth = ctxcanvas->depth;
+  ctximage->dpy = ctxcanvas->dpy;
+  ctximage->scr = ctxcanvas->scr;
+  ctximage->vis = ctxcanvas->vis;
+
+  ctximage->img = XCreatePixmap(ctxcanvas->dpy, ctxcanvas->wnd, w, h, ctxcanvas->depth);
+  if (!ctximage->img)
+  {
+    free(ctximage);
+    return (void *)0;
+  }
+
+  gc = XCreateGC(ctximage->dpy, ctximage->img, 0, NULL);
+  XSetForeground(ctximage->dpy, gc, cdxGetPixel(ctxcanvas, CD_WHITE));
+  XFillRectangle(ctximage->dpy, ctximage->img, gc, 0, 0, ctximage->w, ctxcanvas->canvas->h);
+  XFreeGC(ctximage->dpy, gc);
+
+  return (void *)ctximage;
+}
+
+static void cdgetimage (cdCtxCanvas *ctxcanvas, cdCtxImage *ctximage, int x, int y)
+{
+  XCopyArea(ctxcanvas->dpy, ctxcanvas->wnd, ctximage->img, ctxcanvas->gc,
+            x, y - ctximage->h+1, ctximage->w, ctximage->h, 0, 0);
+}
+
+static void cdputimagerect (cdCtxCanvas *ctxcanvas, cdCtxImage *ctximage, int x, int y, int xmin, int xmax, int ymin, int ymax)
+{
+  XCopyArea(ctxcanvas->dpy, ctximage->img, ctxcanvas->wnd, ctxcanvas->gc,
+            xmin, ctximage->h-ymax-1, xmax-xmin+1, ymax-ymin+1, x, y-(ymax-ymin+1)+1);
+}
+
+static void cdkillimage (cdCtxImage *ctximage)
+{
+  XFreePixmap(ctximage->dpy, ctximage->img);
+  free(ctximage);
+}
+
+static void cdscrollarea (cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax, int dx, int dy)
+{
+  XCopyArea(ctxcanvas->dpy, ctxcanvas->wnd, ctxcanvas->wnd, ctxcanvas->gc,
+            xmin, ymin,
+            xmax-xmin+1, ymax-ymin+1,
+            xmin+dx, ymin+dy);
+}
+
+static void cdtransform(cdCtxCanvas *ctxcanvas, const double* matrix)
+{
+  if (matrix)
+  {
+    /* configure a bottom-up coordinate system */
+    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); 
+    cdMatrixMultiply(matrix, ctxcanvas->xmatrix);
+
+    ctxcanvas->canvas->invert_yaxis = 0;
+  }
+  else
+  {
+    ctxcanvas->canvas->invert_yaxis = 1;
+  }
+}
+
+/******************************************************************/
+
+static void set_rotate_attrib(cdCtxCanvas* ctxcanvas, char* data)
+{
+  if (data)
+  {
+    sscanf(data, "%g %d %d", &ctxcanvas->rotate_angle,
+                             &ctxcanvas->rotate_center_x,
+                             &ctxcanvas->rotate_center_y);
+
+    cdCanvasTransformTranslate(ctxcanvas->canvas, ctxcanvas->rotate_center_x, ctxcanvas->rotate_center_y);
+    cdCanvasTransformRotate(ctxcanvas->canvas, ctxcanvas->rotate_angle);
+    cdCanvasTransformTranslate(ctxcanvas->canvas, -ctxcanvas->rotate_center_x, -ctxcanvas->rotate_center_y);
+  }
+  else
+  {
+    ctxcanvas->rotate_angle = 0;
+    ctxcanvas->rotate_center_x = 0;
+    ctxcanvas->rotate_center_y = 0;
+
+    cdCanvasTransform(ctxcanvas->canvas, NULL);
+  }
+}
+
+static char* get_rotate_attrib(cdCtxCanvas* ctxcanvas)
+{
+  static char data[100];
+
+  if (!ctxcanvas->rotate_angle)
+    return NULL;
+
+  sprintf(data, "%g %d %d", (double)ctxcanvas->rotate_angle,
+                            ctxcanvas->rotate_center_x,
+                            ctxcanvas->rotate_center_y);
+
+  return data;
+}
+
+static cdAttribute rotate_attrib =
+{
+  "ROTATE",
+  set_rotate_attrib,
+  get_rotate_attrib
+}; 
+
+static char* get_gc_attrib(cdCtxCanvas *ctxcanvas)
+{
+  return (char*)ctxcanvas->gc;
+}
+
+static cdAttribute gc_attrib =
+{
+  "GC",
+  NULL,
+  get_gc_attrib
+}; 
+
+static void get_geometry(Display *dpy, Drawable wnd, cdCtxCanvas *ctxcanvas)
+{
+  Window root;
+  int x, y;
+  unsigned int w, h, b, d;
+  XGetGeometry(dpy, wnd, &root, &x, &y, &w, &h, &b, &d);
+  ctxcanvas->canvas->w = w;
+  ctxcanvas->canvas->h = h;
+  ctxcanvas->depth = d;
+}
+
+cdCtxCanvas *cdxCreateCanvas(cdCanvas* canvas, Display *dpy, int scr, Drawable wnd, Visual *vis)
+{
+  static int first = 1;
+  cdCtxCanvas *ctxcanvas = (cdCtxCanvas *)malloc(sizeof(cdCtxCanvas));
+  memset(ctxcanvas, 0, sizeof(cdCtxCanvas));
+
+  ctxcanvas->dpy = dpy;
+  ctxcanvas->scr = scr;
+  ctxcanvas->wnd = wnd;
+  ctxcanvas->vis = vis;
+  ctxcanvas->gc = XCreateGC(dpy, wnd, 0, NULL);
+  if (ctxcanvas->gc == 0) 
+  {
+    free(canvas);
+    return NULL;
+  }
+
+  ctxcanvas->canvas = canvas;
+  canvas->ctxcanvas = ctxcanvas;
+  
+  get_geometry(dpy, wnd, ctxcanvas);
+
+  canvas->bpp = ctxcanvas->depth;
+  canvas->xres = ((double)DisplayWidth(dpy, scr) / (double)DisplayWidthMM(dpy, scr));
+  canvas->yres = ((double)DisplayHeight(dpy, scr) / (double)DisplayHeightMM(dpy, scr));
+  canvas->w_mm = ((double)canvas->w) / canvas->xres;
+  canvas->h_mm = ((double)canvas->h) / canvas->yres;
+  canvas->invert_yaxis = 1;
+
+  if (first)
+  {
+    if (canvas->bpp > 8)
+    {
+      cdxGetRGB = truecolor_get_rgb;
+      cdxGetPixel = truecolor_get_pixel;
+
+       /* make linear colormap for DirectColor visual */
+#ifdef __cplusplus
+      if (ctxcanvas->vis->c_class == DirectColor) 
+#else
+      if (ctxcanvas->vis->class == DirectColor) 
+#endif
+        makeDirectCmap(ctxcanvas, DefaultColormap(ctxcanvas->dpy, ctxcanvas->scr));
+    }
+    else
+    {
+      cdxGetRGB = not_truecolor_get_rgb;
+      cdxGetPixel = not_truecolor_get_pixel;
+    }
+  }
+  
+  if (canvas->bpp > 8)
+  {
+    ctxcanvas->rshift = 15 - highbit(ctxcanvas->vis->red_mask);
+    ctxcanvas->gshift = 15 - highbit(ctxcanvas->vis->green_mask);
+    ctxcanvas->bshift = 15 - highbit(ctxcanvas->vis->blue_mask);
+  
+    ctxcanvas->num_colors = 0;
+    ctxcanvas->colormap = (Colormap)0;
+
+    /* para canvas bpp <= 8 RGBA e' simulado com cdGetImageRGB */
+    canvas->cxPutImageRectRGBA = cdputimagerectrgba;
+  }
+  else
+  {
+    int i;
+
+    ctxcanvas->colormap = DefaultColormap(dpy, scr);
+    ctxcanvas->num_colors = 1L << canvas->bpp;
+
+    for (i=0; i<ctxcanvas->num_colors; i++) 
+      ctxcanvas->color_table[i].pixel = i;
+
+    update_colors(ctxcanvas);
+  }
+
+  if (first)
+  {
+    if(!getenv("CD_XERROR"))
+      XSetErrorHandler(cdxErrorHandler);
+  }
+
+  cdRegisterAttribute(canvas, &gc_attrib);
+  cdRegisterAttribute(canvas, &rotate_attrib);
+
+  first = 0;
+
+  return ctxcanvas;
+}
+
+void cdxInitTable(cdCanvas* canvas)
+{
+  canvas->cxFlush = cdflush;
+  canvas->cxClear = cdclear;
+  canvas->cxPixel = cdpixel;
+  canvas->cxLine = cdline;
+  canvas->cxPoly = cdxPoly;
+  canvas->cxRect = cdrect;
+  canvas->cxBox = cdbox;
+  canvas->cxArc = cdarc;
+  canvas->cxSector = cdsector;
+  canvas->cxChord = cdchord;
+  canvas->cxText = cdtext;
+
+  canvas->cxNewRegion = cdnewregion;
+  canvas->cxIsPointInRegion = cdispointinregion;
+  canvas->cxOffsetRegion = cdoffsetregion;
+  canvas->cxGetRegionBox = cdgetregionbox;
+  canvas->cxClip = cdxClip;
+  canvas->cxClipArea = cdcliparea;
+  canvas->cxWriteMode = cdwritemode;
+  canvas->cxLineStyle = cdlinestyle;
+  canvas->cxLineWidth = cdlinewidth;
+  canvas->cxLineCap = cdlinecap;
+  canvas->cxLineJoin = cdlinejoin;
+  canvas->cxBackOpacity = cdbackopacity;
+  canvas->cxInteriorStyle = cdinteriorstyle;
+  canvas->cxHatch = cdhatch;
+  canvas->cxStipple = cdstipple;
+  canvas->cxPattern = cdpattern;
+  canvas->cxFont = cdfont;
+  canvas->cxNativeFont = cdnativefont;
+  canvas->cxGetFontDim = cdgetfontdim;
+  canvas->cxGetTextSize = cdgettextsize;
+  canvas->cxPalette = cdpalette;
+  canvas->cxBackground = cdbackground;
+  canvas->cxForeground = cdforeground;
+  canvas->cxTransform = cdtransform;
+
+  canvas->cxGetImageRGB = cdgetimagergb;
+  canvas->cxScrollArea = cdscrollarea;
+
+  canvas->cxCreateImage = cdcreateimage;
+  canvas->cxGetImage = cdgetimage;
+  canvas->cxPutImageRect = cdputimagerect;
+  canvas->cxKillImage = cdkillimage;
+
+  canvas->cxPutImageRectRGB = cdputimagerectrgb;
+  canvas->cxPutImageRectMap = cdputimagerectmap;
+
+  if (canvas->bpp > 8)
+    canvas->cxPutImageRectRGBA = cdputimagerectrgba;
+}
diff --git a/src/x11/cdx11.h b/src/x11/cdx11.h
new file mode 100644
index 0000000..a68fdf9
--- /dev/null
+++ b/src/x11/cdx11.h
@@ -0,0 +1,85 @@
+/** \file
+ * \brief X-Windows Base Driver
+ *
+ * See Copyright Notice in cd.h
+ */
+
+#ifndef __CDX11_H
+#define __CDX11_H
+
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+#include "cd.h"
+#include "cd_private.h"
+
+
+/* Hidden declaration for the Context Plus driver */
+typedef struct _cdxContextPlus cdxContextPlus;
+
+struct _cdCtxImage {
+  unsigned int w, h, depth;
+  Pixmap img;
+  Display *dpy;
+  int scr;
+  Visual *vis;
+};
+
+struct _cdCtxCanvas {
+  cdCanvas* canvas;
+  Display* dpy;          /* display da aplicacao no X */
+  Visual* vis;           /* visual usado pela aplicacao */
+  int scr;               /* screen da aplicacao */
+  GC gc;                 /* contexto grafico */
+  Drawable wnd;          /* drawable */
+  long int fg;
+  Pixmap last_hatch;     /* ultimo hatch setado pelo usuario */
+  Pixmap last_stipple;   /* ultimo stipple setado pelo usuario */
+  Pixmap last_pattern;   /* ultimo pattern setado pelo usuario */
+  GC last_stipple_gc;
+  int last_stipple_w;
+  int last_stipple_h;
+  GC last_pattern_gc;
+  int last_pattern_w;
+  int last_pattern_h;
+  XFontStruct *font;     /* fonte de caracteres no X */
+  unsigned int depth;    /* depth do canvas */
+  Pixmap clip_polygon;   /* poligono de clipping */
+  Pixmap new_region, region_aux;
+  GC region_aux_gc;
+  void *data;            /* informacoes especificas do driver */
+  long int *xidata;      /* ximage cache */
+  int xisize;
+  Colormap colormap;          /* colormap para todos os canvas */
+  XColor color_table[256];    /* 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 */
+  float  rotate_angle;
+  int    rotate_center_x,
+         rotate_center_y;
+
+  cdImage* image_dbuffer; /* utilizado pelo driver de Double buffer */
+  cdCanvas* canvas_dbuffer;
+
+  cdxContextPlus* ctxplus;
+};
+
+#define cdCOLOR8TO16(_x) (_x*257)  /* 65535/255 = 257 */
+#define cdCOLOR16TO8(_x) ((unsigned char)(_x/257))
+
+extern unsigned long (*cdxGetPixel)(cdCtxCanvas *ctxcanvas, unsigned long rgb);
+extern void (*cdxGetRGB)(cdCtxCanvas *ctxcanvas, unsigned long pixel, 
+                                                 unsigned char* red, 
+                                                 unsigned char* green, 
+                                                 unsigned char* blue);
+
+cdCtxCanvas *cdxCreateCanvas(cdCanvas* canvas, Display *dpy, int scr, Drawable wnd, Visual *vis);
+void cdxInitTable(cdCanvas* canvas);
+void cdxKillCanvas(cdCtxCanvas *ctxcanvas);
+int cdxClip(cdCtxCanvas *ctxcanvas, int clip_mode);
+void cdxPoly(cdCtxCanvas *ctxcanvas, int mode, cdPoint* poly, int n);
+
+#endif
diff --git a/src/x11/cdxclp.c b/src/x11/cdxclp.c
new file mode 100644
index 0000000..d775fde
--- /dev/null
+++ b/src/x11/cdxclp.c
@@ -0,0 +1,136 @@
+/** \file
+ * \brief X-Windows Clipboard Driver
+ *
+ * See Copyright Notice in cd.h
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+#include "cd.h"
+#include "cd_private.h"
+#include "cdclipbd.h"
+#include "cdmf.h"
+#include "cdmf_private.h"
+
+
+static void cdkillcanvas(cdCtxCanvas *ctxcanvas)
+{
+  char* buffer;
+  long dwSize;
+  FILE* file;
+  char filename[10240];
+  cdCanvasMF* mfcanvas = (cdCanvasMF*)ctxcanvas;
+  Display* dpy = (Display*)mfcanvas->data;
+
+  /* guardar antes de remover o canvas */
+  strcpy(filename, mfcanvas->filename);
+
+  cdkillcanvasMF(mfcanvas);
+
+  file = fopen(filename, "r");
+  fseek(file, 0, SEEK_END);
+  dwSize = ftell(file); 
+  fseek(file, 0, SEEK_SET);
+
+  buffer = (char*)malloc(dwSize);
+  fread(buffer, dwSize, 1, file);
+
+  fclose(file);
+
+  remove(filename);
+
+  XStoreBytes(dpy, buffer, dwSize);
+}
+
+static int cdplay(cdCanvas* canvas, int xmin, int xmax, int ymin, int ymax, void *data)
+{
+  char filename[1024]; 
+  char* buffer;
+  int dwSize;
+  FILE* file;
+
+  buffer = XFetchBytes((Display*)data, &dwSize);
+  if (!buffer)
+    return CD_ERROR;
+
+  tmpnam(filename);
+  file = fopen(filename, "w");
+  fwrite(buffer, dwSize, 1, file);
+  fclose(file);
+
+  cdCanvasPlay(canvas, CD_METAFILE, xmin, xmax, ymin, ymax, filename);
+
+  remove(filename);
+
+  XFree(buffer);
+
+  return CD_OK;
+}
+
+static void cdcreatecanvas(cdCanvas* canvas, void *data)
+{
+  char tmpPath[512];
+  char* str = (char*)data;
+  Display* dpy = NULL;
+
+  /* Inicializa parametros */
+  if (str == NULL) 
+    return;
+
+#ifdef SunOS_OLD
+  sscanf(str, "%d", &dpy); 
+#else
+  sscanf(str, "%p", &dpy); 
+#endif
+
+  if (!dpy)
+    return;
+
+  str = strstr(str, " ");
+  if (!str)
+    return;
+
+  str++;
+  tmpnam(tmpPath);
+
+  strcat(tmpPath, " ");
+  strcat(tmpPath, str);
+
+  cdcreatecanvasMF(canvas, str);
+  if (!canvas->ctxcanvas)
+    return;
+
+  {
+    cdCanvasMF* mfcanvas = (cdCanvasMF*)canvas->ctxcanvas;
+    mfcanvas->data = dpy;
+  }
+}
+
+static void cdinittable(cdCanvas* canvas)
+{
+  cdinittableMF(canvas);
+  canvas->cxKillCanvas = cdkillcanvas;
+}
+
+
+static cdContext cdClipboardContext =
+{
+  CD_CAP_ALL & ~(CD_CAP_GETIMAGERGB | CD_CAP_IMAGESRV | CD_CAP_FONTDIM | CD_CAP_TEXTSIZE),
+  0,
+  cdcreatecanvas,  
+  cdinittable,
+  cdplay,          
+  NULL
+};
+
+cdContext* cdContextClipboard(void)
+{
+  return &cdClipboardContext;
+}
+
+
diff --git a/src/x11/cdxdbuf.c b/src/x11/cdxdbuf.c
new file mode 100644
index 0000000..1c92da5
--- /dev/null
+++ b/src/x11/cdxdbuf.c
@@ -0,0 +1,156 @@
+/** \file
+ * \brief X-Windows Double Buffer Driver
+ *
+ * See Copyright Notice in cd.h
+ */
+
+#include "cdx11.h"
+#include "cddbuf.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+
+static void cdkillcanvas (cdCtxCanvas* ctxcanvas)
+{
+  cdKillImage(ctxcanvas->image_dbuffer);
+  cdxKillCanvas(ctxcanvas);
+}
+
+static void cddeactivate(cdCtxCanvas* ctxcanvas)
+{
+  cdCanvas* canvas_dbuffer = ctxcanvas->canvas_dbuffer;
+  /* this is done in the canvas_dbuffer context */
+  cdCanvasDeactivate(canvas_dbuffer);
+}
+
+static void cdflush(cdCtxCanvas* ctxcanvas)
+{
+  int old_writemode;
+  cdImage* image_dbuffer = ctxcanvas->image_dbuffer;
+  cdCanvas* canvas_dbuffer = ctxcanvas->canvas_dbuffer;
+
+  /* flush the writing in the image */
+  XFlush(ctxcanvas->dpy);
+
+  /* this is done in the canvas_dbuffer context */
+  /* Flush can be affected by Origin and Clipping, but not WriteMode */
+  old_writemode = cdCanvasWriteMode(canvas_dbuffer, CD_REPLACE);
+  cdCanvasPutImageRect(canvas_dbuffer, image_dbuffer, 0, 0, 0, 0, 0, 0);
+  cdCanvasWriteMode(canvas_dbuffer, old_writemode);
+}
+
+static void cdcreatecanvas(cdCanvas* canvas, cdCanvas* canvas_dbuffer)
+{
+  cdCtxCanvas* ctxcanvas;
+  cdImage* image_dbuffer;
+  cdCtxImage* ctximage;
+
+  /* this is done in the canvas_dbuffer context */
+  image_dbuffer = cdCanvasCreateImage(canvas_dbuffer, canvas_dbuffer->w, canvas_dbuffer->h);
+  if (!image_dbuffer) 
+    return;
+
+  ctximage = image_dbuffer->ctximage;
+
+  /* Inicializa driver DBuffer */
+  ctxcanvas = cdxCreateCanvas(canvas, ctximage->dpy, ctximage->scr, ctximage->img, ctximage->vis);
+  if (!ctxcanvas)
+    return;
+
+  ctxcanvas->image_dbuffer = image_dbuffer;
+  ctxcanvas->canvas_dbuffer = canvas_dbuffer;
+}
+
+static int cdactivate(cdCtxCanvas* ctxcanvas)
+{
+  cdCanvas* canvas_dbuffer = ctxcanvas->canvas_dbuffer;
+
+  /* this is done in the canvas_dbuffer context */
+  /* this will update canvas size */
+  cdCanvasActivate(canvas_dbuffer);
+
+  /* check if the size changed */
+  if (canvas_dbuffer->w != ctxcanvas->image_dbuffer->w ||
+      canvas_dbuffer->h != ctxcanvas->image_dbuffer->h)
+  {
+    cdCanvas* canvas = ctxcanvas->canvas;
+    /* save the current, if the rebuild fail */
+    cdImage* old_image_dbuffer = ctxcanvas->image_dbuffer;
+    cdCtxCanvas* old_ctxcanvas = ctxcanvas;
+
+    /* if the image is rebuild, the canvas that uses the image must be also rebuild */
+
+    /* rebuild the image and the canvas */
+    canvas->ctxcanvas = NULL;
+    canvas->context->cxCreateCanvas(canvas, canvas_dbuffer);
+    if (!canvas->ctxcanvas)
+    {
+      canvas->ctxcanvas = old_ctxcanvas;
+      return CD_ERROR;
+    }
+
+    /* remove the old image and canvas */
+    cdKillImage(old_image_dbuffer);
+    cdxKillCanvas(old_ctxcanvas);
+
+    ctxcanvas = canvas->ctxcanvas;
+
+    /* update canvas attributes */
+    canvas->cxBackground(ctxcanvas, canvas->background);
+    canvas->cxForeground(ctxcanvas, canvas->foreground);
+    canvas->cxBackOpacity(ctxcanvas, canvas->back_opacity);
+    canvas->cxWriteMode(ctxcanvas, canvas->write_mode);
+    canvas->cxLineStyle(ctxcanvas, canvas->line_style);
+    canvas->cxLineWidth(ctxcanvas, canvas->line_width);
+    canvas->cxLineCap(ctxcanvas, canvas->line_cap);
+    canvas->cxLineJoin(ctxcanvas, canvas->line_join);
+    canvas->cxHatch(ctxcanvas, canvas->hatch_style);
+    if (canvas->stipple) canvas->cxStipple(ctxcanvas, canvas->stipple_w, canvas->stipple_h, canvas->stipple);
+    if (canvas->pattern) canvas->cxPattern(ctxcanvas, canvas->pattern_w, canvas->pattern_h, canvas->pattern);
+    canvas->cxInteriorStyle(ctxcanvas, canvas->interior_style);
+    if (canvas->native_font[0] == 0) canvas->cxFont(ctxcanvas, canvas->font_type_face, canvas->font_style, canvas->font_size);
+    else canvas->cxNativeFont(ctxcanvas, canvas->native_font);
+/*    canvas->cxTextAlignment(ctxcanvas, canvas->text_alignment);     */
+/*    canvas->cxTextOrientation(ctxcanvas, canvas->text_orientation); */
+    if (canvas->clip_mode == CD_CLIPAREA && canvas->cxClipArea) canvas->cxClipArea(ctxcanvas, canvas->clip_rect.xmin, canvas->clip_rect.xmax, canvas->clip_rect.ymin, canvas->clip_rect.ymax);
+/*    if (canvas->clip_mode == CD_CLIPAREA && canvas->cxFClipArea) canvas->cxFClipArea(ctxcanvas, canvas->clip_frect.xmin, canvas->clip_frect.xmax, canvas->clip_frect.ymin, canvas->clip_frect.ymax); */
+    if (canvas->clip_mode == CD_CLIPPOLYGON && canvas->clip_poly) canvas->cxPoly(ctxcanvas, CD_CLIP, canvas->clip_poly, canvas->clip_poly_n);
+/*    if (canvas->clip_mode == CD_CLIPPOLYGON && canvas->clip_fpoly) canvas->cxFPoly(ctxcanvas, CD_CLIP, canvas->clip_fpoly, canvas->clip_poly_n); */
+    if (canvas->clip_mode != CD_CLIPOFF) canvas->cxClip(ctxcanvas, canvas->clip_mode);
+  }
+
+  return CD_OK;
+}
+
+static void cdinittable(cdCanvas* canvas)
+{
+  cdxInitTable(canvas);
+
+  canvas->cxActivate = cdactivate;
+  canvas->cxDeactivate = cddeactivate;
+  canvas->cxFlush = cdflush;
+  canvas->cxKillCanvas = cdkillcanvas;
+}
+
+static cdContext cdDBufferContext =
+{
+  CD_CAP_ALL & ~(CD_CAP_PLAY | CD_CAP_YAXIS | 
+                 CD_CAP_FPRIMTIVES ),
+  0,
+  cdcreatecanvas,  
+  cdinittable,
+  NULL,             
+  NULL, 
+};
+
+cdContext* cdContextDBuffer(void)
+{
+  if (cdUseContextPlus(CD_QUERY))
+  {
+    cdContext* ctx = cdGetContextPlus(CD_CTX_DBUFFER);
+    if (ctx != NULL)
+      return ctx;
+  }
+
+  return &cdDBufferContext;
+}
diff --git a/src/x11/cdximg.c b/src/x11/cdximg.c
new file mode 100644
index 0000000..8131f78
--- /dev/null
+++ b/src/x11/cdximg.c
@@ -0,0 +1,52 @@
+/** \file
+ * \brief X-Windows Image Driver
+ *
+ * See Copyright Notice in cd.h
+ */
+
+#include <stdlib.h>
+
+#include "cdx11.h"
+#include "cdimage.h"
+
+
+static void cdkillcanvas(cdCtxCanvas* ctxcanvas)
+{
+  cdxKillCanvas(ctxcanvas);
+}
+
+static void cdcreatecanvas(cdCanvas* canvas, void *data)
+{
+  cdCtxImage *ctximage = ((cdImage*)data)->ctximage;
+  cdxCreateCanvas(canvas, ctximage->dpy, ctximage->scr, ctximage->img, ctximage->vis);
+}
+
+static void cdinittable(cdCanvas* canvas)
+{
+  cdxInitTable(canvas);
+
+  canvas->cxKillCanvas = cdkillcanvas;
+}
+
+static cdContext cdImageContext =
+{
+  CD_CAP_ALL & ~(CD_CAP_PLAY | CD_CAP_YAXIS | CD_CAP_FPRIMTIVES ),
+  0,
+  cdcreatecanvas,
+  cdinittable,
+  NULL,
+  NULL
+};
+
+
+cdContext* cdContextImage(void)
+{
+  if (cdUseContextPlus(CD_QUERY))
+  {
+    cdContext* ctx = cdGetContextPlus(CD_CTX_IMAGE);
+    if (ctx != NULL)
+      return ctx;
+  }
+
+  return &cdImageContext;
+}
diff --git a/src/x11/cdxnative.c b/src/x11/cdxnative.c
new file mode 100644
index 0000000..c708d20
--- /dev/null
+++ b/src/x11/cdxnative.c
@@ -0,0 +1,165 @@
+/** \file
+ * \brief X-Windows Native Window Driver
+ *
+ * See Copyright Notice in cd.h
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "cdx11.h"
+#include "cdnative.h"
+
+
+int cdGetScreenColorPlanes(void)
+{
+  static int first = 1;
+  static int bpp;
+
+  if (first)
+  {
+    int nitems;
+    XVisualInfo info;
+    Display* drv_display = XOpenDisplay(NULL);
+
+    info.depth = 24;
+    if (XGetVisualInfo(drv_display, VisualDepthMask, &info, &nitems) != NULL)
+    {
+      bpp = 24;
+      XCloseDisplay(drv_display);
+      return bpp;
+    }
+
+    info.depth = 16;
+    if (XGetVisualInfo(drv_display, VisualDepthMask, &info, &nitems) != NULL)
+    {
+      bpp = 16;
+      XCloseDisplay(drv_display);
+      return bpp;
+    }
+
+    info.depth = 8;
+    if (XGetVisualInfo(drv_display, VisualDepthMask, &info, &nitems) != NULL)
+    {
+      bpp = 8;
+      XCloseDisplay(drv_display);
+      return bpp;
+    }
+
+    info.depth = 4;
+    if (XGetVisualInfo(drv_display, VisualDepthMask, &info, &nitems) != NULL)
+    {
+      bpp = 4;
+      XCloseDisplay(drv_display);
+      return bpp;
+    }
+
+    bpp = 2;
+    XCloseDisplay(drv_display);
+
+    first = 0;
+  }
+
+  return bpp;
+}
+
+void cdGetScreenSize(int *width, int *height, double *width_mm, double *height_mm)
+{
+  static int first = 1;
+  static int dpy_width, dpy_height, dpy_width_mm, dpy_height_mm;
+
+  if (first)
+  {
+    Display* drv_display = XOpenDisplay(NULL);
+    int drv_screen  = DefaultScreen (drv_display);
+
+    dpy_width = DisplayWidth(drv_display,drv_screen);
+    dpy_height = DisplayHeight(drv_display,drv_screen);
+    dpy_width_mm = DisplayWidthMM(drv_display,drv_screen);
+    dpy_height_mm = DisplayHeightMM(drv_display,drv_screen);
+
+    XCloseDisplay(drv_display);
+
+    first = 0;
+  }
+
+  if (width) *width = dpy_width;
+  if (height) *height = dpy_height;
+  if (width_mm) *width_mm = dpy_width_mm;
+  if (height_mm) *height_mm = dpy_height_mm;
+}
+
+static void cdkillcanvas(cdCtxCanvas *ctxcanvas)
+{
+  cdxKillCanvas(ctxcanvas);
+}
+
+static int cdactivate(cdCtxCanvas *ctxcanvas)
+{
+  Window root;
+  int x, y;
+  unsigned int bw, d;
+  XGetGeometry(ctxcanvas->dpy, ctxcanvas->wnd, &root, &x, &y,
+               (unsigned int*)&ctxcanvas->canvas->w, (unsigned int*)&ctxcanvas->canvas->h, &bw, &d);
+
+  ctxcanvas->canvas->w_mm = ((double)ctxcanvas->canvas->w) / ctxcanvas->canvas->xres;
+  ctxcanvas->canvas->h_mm = ((double)ctxcanvas->canvas->h) / ctxcanvas->canvas->yres;
+
+  if (ctxcanvas->canvas->use_matrix)
+    ctxcanvas->canvas->cxTransform(ctxcanvas, ctxcanvas->canvas->matrix);
+
+  return CD_OK;
+}
+
+static void cdcreatecanvas(cdCanvas* canvas, void *data)
+{
+  char* data_str = (char*)data;
+  Window wnd;
+  Display *dpy;
+  XWindowAttributes wa;
+
+#ifdef SunOS_OLD
+  sscanf(data_str, "%d %lu", &dpy, &wnd); 
+#else
+  sscanf(data_str, "%p %lu", &dpy, &wnd); 
+#endif
+
+  if (!dpy || !wnd) 
+    return;
+
+  XGetWindowAttributes(dpy, wnd, &wa);
+  cdxCreateCanvas(canvas, dpy, XScreenNumberOfScreen(wa.screen), wnd, wa.visual);
+}
+
+static void cdinittable(cdCanvas* canvas)
+{
+  cdxInitTable(canvas);
+
+  canvas->cxKillCanvas = cdkillcanvas;
+  canvas->cxActivate = cdactivate;
+}
+
+/******************************************************/
+
+static cdContext cdNativeWindowContext =
+{
+  CD_CAP_ALL & ~(CD_CAP_PLAY | CD_CAP_YAXIS | CD_CAP_FPRIMTIVES ),
+  1,
+  cdcreatecanvas,
+  cdinittable,
+  NULL,
+  NULL,
+};
+
+
+cdContext* cdContextNativeWindow(void)
+{
+  if (cdUseContextPlus(CD_QUERY))
+  {
+    cdContext* ctx = cdGetContextPlus(CD_CTX_NATIVEWINDOW);
+    if (ctx != NULL)
+      return ctx;
+  }
+
+  return &cdNativeWindowContext;
+}
diff --git a/src/x11/xvertex.c b/src/x11/xvertex.c
new file mode 100644
index 0000000..87a05e9
--- /dev/null
+++ b/src/x11/xvertex.c
@@ -0,0 +1,1440 @@
+/* ********************************************************************** */
+
+/* xvertext 5.0, Copyright (c) 1993 Alan Richardson (mppa3@uk.ac.sussex.syma)
+*
+* Permission to use, copy, modify, and distribute this software and its
+* documentation for any purpose and without fee is hereby granted, provided
+* that the above copyright notice appear in all copies and that both the
+* copyright notice and this permission notice appear in supporting
+* documentation.  All work developed as a consequence of the use of
+* this program should duly acknowledge such use. No representations are
+* made about the suitability of this software for any purpose.  It is
+* provided "as is" without express or implied warranty.
+*/
+
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xatom.h>
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+
+#include "xvertex.h"
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/* Make sure cache size is set */
+
+#ifndef CACHE_SIZE_LIMIT
+#define CACHE_SIZE_LIMIT 300
+#endif /*CACHE_SIZE_LIMIT */
+
+/* Make sure a cache method is specified */
+
+#ifndef CACHE_XIMAGES
+#ifndef CACHE_BITMAPS
+#define CACHE_BITMAPS
+#endif /*CACHE_BITMAPS*/
+#endif /*CACHE_XIMAGES*/
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/* Debugging macros */
+
+#ifdef DEBUG
+static int debug=1;
+#else
+static int debug=0;
+#endif /*DEBUG*/
+
+#define DEBUG_PRINT1(a) if (debug) printf (a)
+#define DEBUG_PRINT2(a, b) if (debug) printf (a, b)
+#define DEBUG_PRINT3(a, b, c) if (debug) printf (a, b, c)
+#define DEBUG_PRINT4(a, b, c, d) if (debug) printf (a, b, c, d)
+#define DEBUG_PRINT5(a, b, c, d, e) if (debug) printf (a, b, c, d, e)
+
+
+/* ---------------------------------------------------------------------- */
+
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/* A structure holding everything needed for a rotated string */
+
+typedef struct rotated_text_item_template {
+  Pixmap bitmap;
+  XImage *ximage;
+  
+  char *text;
+  char *font_name;
+  Font fid;
+  double angle;
+  int align;
+  double magnify;
+  
+  int cols_in;
+  int rows_in;
+  int cols_out;
+  int rows_out;
+  
+  int nl;
+  int max_width;
+  double *corners_x;
+  double *corners_y;
+  
+  long int size;
+  int cached;
+  
+  struct rotated_text_item_template *next;
+} RotatedTextItem;
+
+static RotatedTextItem *first_text_item=NULL;
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/* A structure holding current magnification and bounding box padding */
+
+static struct style_template {
+  double magnify;
+  int bbx_pad;
+} style={
+  1.,
+    0
+};
+
+
+/* ---------------------------------------------------------------------- */
+
+static RotatedTextItem *XRotCreateTextItem(Display *dpy, XFontStruct *font, double angle, char *text, int align);
+static void XRotAddToLinkedList(Display *dpy, RotatedTextItem *item);
+static XImage *XRotMagnifyImage(Display *dpy, XImage *ximage);
+static void XRotFreeTextItem(Display *dpy, RotatedTextItem *item);
+
+/* ---------------------------------------------------------------------- */
+
+
+/**************************************************************************/
+/* Routine to mimic `strdup()' (some machines don't have it)              */
+/**************************************************************************/
+
+static char *my_strdup(const char *str)
+{
+  char *s;
+  
+  if(str==NULL)
+    return NULL;
+  
+  s=(char *)malloc((unsigned)(strlen(str)+1));
+  if(s!=NULL) 
+    strcpy(s, str);
+  
+  return s;
+}
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/**************************************************************************/
+/* Routine to replace `strtok' : this one returns a zero length string if */
+/* it encounters two consecutive delimiters                               */
+/**************************************************************************/
+
+static char *my_strtok(char *str1, const char *str2)
+{
+  char *ret;
+  int i, j, stop;
+  static int start, len;
+  static char *stext;
+  
+  if(str2==NULL)
+    return NULL;
+  
+  /* initialise if str1 not NULL */
+  if(str1!=NULL) 
+  {
+    start=0;
+    stext=str1;
+    len=strlen(str1);
+  }
+  
+  /* run out of tokens ? */
+  if(start>=len)
+    return NULL;
+  
+  /* loop through characters */
+  for(i=start; i<len; i++) 
+  {
+    /* loop through delimiters */
+    stop=0;
+    for(j=0; j<strlen(str2); j++)
+      if(stext[i]==str2[j])
+        stop=1;
+      
+    if(stop)
+      break;
+  }
+  
+  stext[i]='\0';
+  
+  ret=stext+start;
+  
+  start=i+1;
+  
+  return ret;
+}
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/**************************************************************************/
+/*  Create an XImage structure and allocate memory for it                 */
+/**************************************************************************/
+
+static XImage *MakeXImage(Display *dpy, int w, int h)
+{
+  XImage *I;
+  char *data;
+  
+  /* reserve memory for image */
+  data=(char *)calloc((unsigned)(((w-1)/8+1)*h), 1);
+  if(data==NULL)
+    return NULL;
+  
+  /* create the XImage */
+  I=XCreateImage(dpy, DefaultVisual(dpy, DefaultScreen(dpy)), 1, XYBitmap, 0, data, w, h, 8, 0);
+  if(I==NULL)
+    return NULL;
+  
+  I->byte_order=I->bitmap_bit_order=MSBFirst;
+  return I;
+}
+
+/* ---------------------------------------------------------------------- */
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/**************************************************************************/
+/*  Draw a horizontal string in a quick fashion                           */
+/**************************************************************************/
+
+static int XRotDrawHorizontalString(Display *dpy, XFontStruct *font, Drawable drawable, GC gc, int x, int y, const char *text, int align, int bg)
+{
+  GC my_gc;
+  int nl=1, i;
+  int height;
+  int xp, yp;
+  char *str1, *str2, *str3;
+  char *str2_a="\0", *str2_b="\n\0";
+  int dir, asc, desc;
+  XCharStruct overall;
+  
+  DEBUG_PRINT1("**\nHorizontal text.\n");
+  
+  /* this gc has similar properties to the user's gc (including stipple) */
+  my_gc=XCreateGC(dpy, drawable, 0, 0);
+  XCopyGC(dpy, gc, GCForeground|GCBackground|GCFunction|GCStipple|GCFillStyle| GCTileStipXOrigin|GCTileStipYOrigin|GCPlaneMask, my_gc);
+  XSetFont(dpy, my_gc, font->fid);
+  
+  /* count number of sections in string */
+  if(align!=XR_LEFT)
+    for(i=0; i<strlen(text)-1; i++)
+      if(text[i]=='\n')
+        nl++;
+      
+  /* ignore newline characters if not doing alignment */
+  if(align==XR_LEFT)
+    str2=str2_a;
+  else
+    str2=str2_b;
+  
+  /* overall font height */
+  height=font->ascent+font->descent;
+  
+  /* y position */
+  if(align==XR_TLEFT || align==XR_TCENTRE || align==XR_TRIGHT)
+    yp=y+font->ascent;
+  else if(align==XR_MLEFT || align==XR_MCENTRE || align==XR_MRIGHT)
+    yp=y-nl*height/2+font->ascent;
+  else if(align==XR_BLEFT || align==XR_BCENTRE || align==XR_BRIGHT)
+    yp=y-nl*height+font->ascent;
+  else
+    yp=y;
+  
+  str1=my_strdup(text);
+  if(str1==NULL)
+    return 1;
+  
+  str3=my_strtok(str1, str2);
+  
+  /* loop through each section in the string */
+  do {
+    XTextExtents(font, str3, strlen(str3), &dir, &asc, &desc,
+      &overall);
+    
+    /* where to draw section in x ? */
+    if(align==XR_TLEFT || align==XR_MLEFT || align==XR_BLEFT || align==XR_LEFT)
+      xp=x;
+    else if(align==XR_TCENTRE || align==XR_MCENTRE || align==XR_BCENTRE || align==XR_CENTRE)
+      xp=x-overall.rbearing/2;
+    else
+      xp=x-overall.rbearing;
+    
+    /* draw string onto bitmap */
+    if(!bg)
+      XDrawString(dpy, drawable, my_gc, xp, yp, str3, strlen(str3));
+    else
+      XDrawImageString(dpy, drawable, my_gc, xp, yp, str3, strlen(str3));
+    
+    /* move to next line */
+    yp+=height;
+    
+    str3=my_strtok((char *)NULL, str2);
+  }
+  while(str3!=NULL);
+  
+  free(str1);
+  XFreeGC(dpy, my_gc);
+  
+  return 0;
+}
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/**************************************************************************/
+/*   Query cache for a match with this font/text/angle/alignment          */
+/*       request, otherwise arrange for its creation                      */
+/**************************************************************************/
+
+static RotatedTextItem *XRotRetrieveFromCache(Display *dpy, XFontStruct *font, double angle, const char *text, int align)
+{
+  Font fid;
+  char *font_name=NULL;
+  unsigned long name_value;
+  RotatedTextItem *item=NULL;
+  RotatedTextItem *i1=first_text_item;
+  
+  /* get font name, if it exists */
+  if(XGetFontProperty(font, XA_FONT, &name_value)) {
+    DEBUG_PRINT1("got font name OK\n");
+    font_name=XGetAtomName(dpy, name_value);
+    fid=0;
+  }
+#ifdef CACHE_FID
+  /* otherwise rely (unreliably?) on font ID */
+  else {
+    DEBUG_PRINT1("can't get fontname, caching FID\n");
+    font_name=NULL;
+    fid=font->fid;
+  }
+#else
+  /* not allowed to cache font ID's */
+  else {
+    DEBUG_PRINT1("can't get fontname, can't cache\n");
+    font_name=NULL;
+    fid=0;
+  }
+#endif /*CACHE_FID*/
+  
+  /* look for a match in cache */
+  
+  /* matching formula:
+  identical text;
+  identical fontname (if defined, font ID's if not);
+  angles close enough (<0.00001 here, could be smaller);
+  HORIZONTAL alignment matches, OR it's a one line string;
+  magnifications the same */
+  
+  while(i1 && !item) 
+  {
+    /* match everything EXCEPT fontname/ID */
+    if(strcmp(text, i1->text)==0 &&
+      fabs(angle-i1->angle)<0.00001 &&
+      style.magnify==i1->magnify &&
+      (i1->nl==1 ||
+      ((align==0)?9:(align-1))%3==
+      ((i1->align==0)?9:(i1->align-1))%3)) 
+    {
+      
+      /* now match fontname/ID */
+      if(font_name!=NULL && i1->font_name!=NULL) 
+      {
+        if(strcmp(font_name, i1->font_name)==0) 
+        {
+          item=i1;
+          DEBUG_PRINT1("Matched against font names\n");
+        }
+        else
+          i1=i1->next;
+      }
+#ifdef CACHE_FID
+      else if(font_name==NULL && i1->font_name==NULL) 
+      {
+        if(fid==i1->fid) 
+        {
+          item=i1;
+          DEBUG_PRINT1("Matched against FID's\n");
+        }
+        else
+          i1=i1->next;
+      }
+#endif /*CACHE_FID*/
+      else
+        i1=i1->next;
+    }
+    else
+      i1=i1->next;
+  }
+  
+  if(item)
+    DEBUG_PRINT1("**\nFound target in cache.\n");
+  if(!item)
+    DEBUG_PRINT1("**\nNo match in cache.\n");
+  
+  /* no match */
+  if(!item) 
+  {
+    /* create new item */
+    item=XRotCreateTextItem(dpy, font, angle, text, align);
+    if(!item)
+      return NULL;
+    
+    /* record what it shows */
+    item->text=my_strdup(text);
+    
+    /* fontname or ID */
+    if(font_name!=NULL) 
+    {
+      item->font_name=my_strdup(font_name);
+      item->fid=0;
+    }
+    else 
+    {
+      item->font_name=NULL;
+      item->fid=fid;
+    }
+    
+    item->angle=angle;
+    item->align=align;
+    item->magnify=style.magnify;
+    
+    /* cache it */
+    XRotAddToLinkedList(dpy, item);
+  }
+  
+  if(font_name)
+    XFree(font_name);
+  
+  /* if XImage is cached, need to recreate the bitmap */
+  
+#ifdef CACHE_XIMAGES
+  {
+    GC depth_one_gc;
+    
+    /* create bitmap to hold rotated text */
+    item->bitmap=XCreatePixmap(dpy, DefaultRootWindow(dpy),
+      item->cols_out, item->rows_out, 1);
+    
+    /* depth one gc */
+    depth_one_gc=XCreateGC(dpy, item->bitmap, 0, 0);
+    XSetBackground(dpy, depth_one_gc, 0);
+    XSetForeground(dpy, depth_one_gc, 1);
+    
+    /* make the text bitmap from XImage */
+    XPutImage(dpy, item->bitmap, depth_one_gc, item->ximage, 0, 0, 0, 0,
+      item->cols_out, item->rows_out);
+    
+    XFreeGC(dpy, depth_one_gc);
+  }
+#endif /*CACHE_XIMAGES*/
+  
+  return item;
+}
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/**************************************************************************/
+/*  Create a rotated text item                                            */
+/**************************************************************************/
+
+static RotatedTextItem *XRotCreateTextItem(Display *dpy, XFontStruct *font, double angle, char *text, int align)
+{
+  RotatedTextItem *item=NULL;
+  Pixmap canvas;
+  GC font_gc;
+  XImage *I_in;
+  register int i, j;
+  char *str1, *str2, *str3;
+  char *str2_a="\0", *str2_b="\n\0";
+  int height;
+  int byte_w_in, byte_w_out;
+  int xp, yp;
+  double sin_angle, cos_angle;
+  int it, jt;
+  double di, dj;
+  int ic=0;
+  double xl, xr, xinc;
+  int byte_out;
+  int dir, asc, desc;
+  XCharStruct overall;
+  int old_cols_in=0, old_rows_in=0;
+  
+  /* allocate memory */
+  item=(RotatedTextItem *)malloc((unsigned)sizeof(RotatedTextItem));
+  if(!item)
+    return NULL;
+  
+  /* count number of sections in string */
+  item->nl=1;
+  if(align!=XR_LEFT)
+    for(i=0; i<strlen(text)-1; i++)
+      if(text[i]=='\n')
+        item->nl++;
+      
+  /* ignore newline characters if not doing alignment */
+  if(align==XR_LEFT)
+    str2=str2_a;
+  else
+    str2=str2_b;
+  
+  /* find width of longest section */
+  str1=my_strdup(text);
+  if(str1==NULL)
+    return NULL;
+  
+  str3=my_strtok(str1, str2);
+  
+  XTextExtents(font, str3, strlen(str3), &dir, &asc, &desc,
+    &overall);
+  
+  item->max_width=overall.rbearing;
+  
+  /* loop through each section */
+  do 
+  {
+    str3=my_strtok((char *)NULL, str2);
+    
+    if(str3!=NULL) 
+    {
+      XTextExtents(font, str3, strlen(str3), &dir, &asc, &desc,
+        &overall);
+      
+      if(overall.rbearing>item->max_width)
+        item->max_width=overall.rbearing;
+    }
+  } while(str3!=NULL);
+  
+  free(str1);
+  
+  /* overall font height */
+  height=font->ascent+font->descent;
+  
+  /* dimensions horizontal text will have */
+  item->cols_in=item->max_width;
+  item->rows_in=item->nl*height;
+  
+  /* bitmap for drawing on */
+  canvas=XCreatePixmap(dpy, DefaultRootWindow(dpy),
+    item->cols_in, item->rows_in, 1);
+  
+  /* create a GC for the bitmap */
+  font_gc=XCreateGC(dpy, canvas, 0, 0);
+  XSetBackground(dpy, font_gc, 0);
+  XSetFont(dpy, font_gc, font->fid);
+  
+  /* make sure the bitmap is blank */
+  XSetForeground(dpy, font_gc, 0);
+  XFillRectangle(dpy, canvas, font_gc, 0, 0, 
+    item->cols_in+1, item->rows_in+1);
+  XSetForeground(dpy, font_gc, 1);
+  
+  /* pre-calculate sin and cos */
+  sin_angle=sin(angle);
+  cos_angle=cos(angle);
+  
+  if (fabs(sin_angle)==1.0) cos_angle=0;
+  if (fabs(cos_angle)==1.0) sin_angle=0;
+  
+  /* text background will be drawn using XFillPolygon */
+  item->corners_x=
+    (double *)malloc((unsigned)(4*item->nl*sizeof(double)));
+  if(!item->corners_x)
+    return NULL;
+  
+  item->corners_y=
+    (double *)malloc((unsigned)(4*item->nl*sizeof(double)));
+  if(!item->corners_y)
+    return NULL;
+  
+  /* draw text horizontally */
+  
+  /* start at top of bitmap */
+  yp=font->ascent;
+  
+  str1=my_strdup(text);
+  if(str1==NULL)
+    return NULL;
+  
+  str3=my_strtok(str1, str2);
+  
+  /* loop through each section in the string */
+  do 
+  {
+    XTextExtents(font, str3, strlen(str3), &dir, &asc, &desc, &overall);
+    
+    /* where to draw section in x ? */
+    if(align==XR_TLEFT || align==XR_MLEFT || align==XR_BLEFT || align==XR_LEFT)
+      xp=0;
+    else if(align==XR_TCENTRE || align==XR_MCENTRE || align==XR_BCENTRE || align==XR_CENTRE)
+      xp=(item->max_width-overall.rbearing)/2;
+    else
+      xp=item->max_width-overall.rbearing;
+    
+    /* draw string onto bitmap */
+    XDrawString(dpy, canvas, font_gc, xp, yp, str3, strlen(str3));
+    
+    /* keep a note of corner positions of this string */
+    item->corners_x[ic]=((double)xp-(double)item->cols_in/2)*style.magnify;
+    item->corners_y[ic]=((double)(yp-font->ascent)-(double)item->rows_in/2)
+      *style.magnify;
+    item->corners_x[ic+1]=item->corners_x[ic];
+    item->corners_y[ic+1]=item->corners_y[ic]+(double)height*style.magnify;
+    item->corners_x[item->nl*4-1-ic]=item->corners_x[ic]+
+      (double)overall.rbearing*style.magnify;
+    item->corners_y[item->nl*4-1-ic]=item->corners_y[ic];
+    item->corners_x[item->nl*4-2-ic]=
+      item->corners_x[item->nl*4-1-ic];
+    item->corners_y[item->nl*4-2-ic]=item->corners_y[ic+1];
+    
+    ic+=2;
+    
+    /* move to next line */
+    yp+=height;
+    
+    str3=my_strtok((char *)NULL, str2);
+  } while(str3!=NULL);
+  
+  free(str1);
+  
+  /* create image to hold horizontal text */
+  I_in=MakeXImage(dpy, item->cols_in, item->rows_in);
+  if(I_in==NULL)
+    return NULL;
+  
+  /* extract horizontal text */
+  XGetSubImage(dpy, canvas, 0, 0, item->cols_in, item->rows_in,
+    1, XYPixmap, I_in, 0, 0);
+  I_in->format=XYBitmap;
+  
+  /* magnify horizontal text */
+  if(style.magnify!=1.) 
+  {
+    I_in=XRotMagnifyImage(dpy, I_in);
+    
+    old_cols_in=item->cols_in;
+    old_rows_in=item->rows_in;
+    item->cols_in=(double)item->cols_in*style.magnify;
+    item->rows_in=(double)item->rows_in*style.magnify;
+  }
+  
+  /* how big will rotated text be ? */
+  item->cols_out=fabs((double)item->rows_in*sin_angle) +
+    fabs((double)item->cols_in*cos_angle) +0.99999 +2;
+  
+  item->rows_out=fabs((double)item->rows_in*cos_angle) +
+    fabs((double)item->cols_in*sin_angle) +0.99999 +2;
+  
+  if(item->cols_out%2==0)
+    item->cols_out++;
+  
+  if(item->rows_out%2==0)
+    item->rows_out++;
+  
+  /* create image to hold rotated text */
+  item->ximage=MakeXImage(dpy, item->cols_out, item->rows_out);
+  if(item->ximage==NULL)
+    return NULL;
+  
+  byte_w_in=(item->cols_in-1)/8+1;
+  byte_w_out=(item->cols_out-1)/8+1;
+  
+  /* we try to make this bit as fast as possible - which is why it looks
+  a bit over-the-top */
+  
+  /* vertical distance from centre */
+  dj=0.5-(double)item->rows_out/2;
+  
+  /* where abouts does text actually lie in rotated image? */
+  if(angle==0 || angle==M_PI/2 || angle==M_PI || angle==3*M_PI/2) 
+  {
+    xl=0;
+    xr=(double)item->cols_out;
+    xinc=0;
+  }
+  else if(angle<M_PI) 
+  {
+    xl=(double)item->cols_out/2+
+      (dj-(double)item->rows_in/(2*cos_angle))/
+      tan(angle)-2;
+
+    xr=(double)item->cols_out/2+
+      (dj+(double)item->rows_in/(2*cos_angle))/
+      tan(angle)+2;
+
+    xinc=1./tan(angle);
+  }
+  else 
+  {
+    xl=(double)item->cols_out/2+
+      (dj+(double)item->rows_in/(2*cos_angle))/
+      tan(angle)-2;
+
+    xr=(double)item->cols_out/2+
+      (dj-(double)item->rows_in/(2*cos_angle))/
+      tan(angle)+2;
+    
+    xinc=1./tan(angle);
+  }
+  
+  /* loop through all relevent bits in rotated image */
+  for(j=0; j<item->rows_out; j++) 
+  {
+    /* no point re-calculating these every pass */
+    di=(double)((xl<0)?0:(int)xl)+0.5-(double)item->cols_out/2;
+    byte_out=(item->rows_out-j-1)*byte_w_out;
+    
+    /* loop through meaningful columns */
+    for(i=((xl<0)?0:(int)xl);i<((xr>=item->cols_out)?item->cols_out:(int)xr); i++) 
+    {
+      /* rotate coordinates */
+      it=(double)item->cols_in/2 + ( di*cos_angle + dj*sin_angle);
+      jt=(double)item->rows_in/2 - (-di*sin_angle + dj*cos_angle);
+      
+      /* set pixel if required */
+      if(it>=0 && it<item->cols_in && jt>=0 && jt<item->rows_in)
+        if((I_in->data[jt*byte_w_in+it/8] & 128>>(it%8))>0)
+          item->ximage->data[byte_out+i/8]|=128>>i%8;
+        
+      di+=1;
+    }
+
+    dj+=1;
+    xl+=xinc;
+    xr+=xinc;
+  }
+
+  XDestroyImage(I_in);
+  
+  if(style.magnify!=1.) 
+  {
+    item->cols_in=old_cols_in;
+    item->rows_in=old_rows_in;
+  }
+      
+      
+#ifdef CACHE_BITMAPS
+      
+  /* create a bitmap to hold rotated text */
+  item->bitmap=XCreatePixmap(dpy, DefaultRootWindow(dpy),
+    item->cols_out, item->rows_out, 1);
+  
+  /* make the text bitmap from XImage */
+  XPutImage(dpy, item->bitmap, font_gc, item->ximage, 0, 0, 0, 0,
+    item->cols_out, item->rows_out);
+  
+  XDestroyImage(item->ximage);
+      
+#endif /*CACHE_BITMAPS*/
+      
+  XFreeGC(dpy, font_gc);
+  XFreePixmap(dpy, canvas);
+  
+  return item;
+}
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/**************************************************************************/
+/*  Adds a text item to the end of the cache, removing as many items      */
+/*      from the front as required to keep cache size below limit         */
+/**************************************************************************/
+
+static void XRotAddToLinkedList(Display *dpy, RotatedTextItem *item)
+{
+  
+  static long int current_size=0;
+  static RotatedTextItem *last=NULL;
+  RotatedTextItem *i1=first_text_item, *i2=NULL;
+  
+#ifdef CACHE_BITMAPS
+  
+  /* I don't know how much memory a pixmap takes in the server -
+  probably this + a bit more we can't account for */
+  
+  item->size=((item->cols_out-1)/8+1)*item->rows_out;
+  
+#else
+  
+  /* this is pretty much the size of a RotatedTextItem */
+  
+  item->size=((item->cols_out-1)/8+1)*item->rows_out +
+    sizeof(XImage) + strlen(item->text) + 
+    item->nl*8*sizeof(double) + sizeof(RotatedTextItem);
+  
+  if(item->font_name!=NULL)
+    item->size+=strlen(item->font_name);
+  else
+    item->size+=sizeof(Font);
+  
+#endif /*CACHE_BITMAPS */
+  
+#ifdef DEBUG
+  /* count number of items in cache, for debugging */
+  {
+    int i=0;
+    
+    while(i1) {
+      i++;
+      i1=i1->next;
+    }
+    DEBUG_PRINT2("Cache has %d items.\n", i);
+    i1=first_text_item;
+  }
+#endif
+  
+  DEBUG_PRINT4("current cache size=%ld, new item=%ld, limit=%d\n",
+    current_size, item->size, CACHE_SIZE_LIMIT*1024);
+  
+  /* if this item is bigger than whole cache, forget it */
+  if(item->size>CACHE_SIZE_LIMIT*1024) {
+    DEBUG_PRINT1("Too big to cache\n\n");
+    item->cached=0;
+    return;
+  }
+  
+  /* remove elements from cache as needed */
+  while(i1 && current_size+item->size>CACHE_SIZE_LIMIT*1024) {
+    
+    DEBUG_PRINT2("Removed %ld bytes\n", i1->size);
+    
+    if(i1->font_name!=NULL)
+      DEBUG_PRINT5("  (`%s'\n   %s\n   angle=%f align=%d)\n",
+      i1->text, i1->font_name, i1->angle, i1->align);
+    
+#ifdef CACHE_FID
+    if(i1->font_name==NULL)
+      DEBUG_PRINT5("  (`%s'\n  FID=%ld\n   angle=%f align=%d)\n",
+      i1->text, i1->fid, i1->angle, i1->align);
+#endif /*CACHE_FID*/
+    
+    current_size-=i1->size;
+    
+    i2=i1->next;
+    
+    /* free resources used by the unlucky item */
+    XRotFreeTextItem(dpy, i1);
+    
+    /* remove it from linked list */
+    first_text_item=i2;
+    i1=i2;
+  }
+  
+  /* add new item to end of linked list */
+  if(first_text_item==NULL) {
+    item->next=NULL;
+    first_text_item=item;
+    last=item;
+  }
+  else {
+    item->next=NULL;
+    last->next=item;
+    last=item;
+  }
+  
+  /* new cache size */
+  current_size+=item->size;
+  
+  item->cached=1;
+  
+  DEBUG_PRINT1("Added item to cache.\n");
+}
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/**************************************************************************/
+/*  Free the resources used by a text item                                */
+/**************************************************************************/
+
+static void XRotFreeTextItem(Display *dpy, RotatedTextItem *item)
+{
+  free(item->text);
+  
+  if(item->font_name!=NULL)
+    free(item->font_name);
+  
+  free((char *)item->corners_x);
+  free((char *)item->corners_y);
+  
+#ifdef CACHE_BITMAPS
+  XFreePixmap(dpy, item->bitmap);
+#else
+  XDestroyImage(item->ximage);
+#endif /* CACHE_BITMAPS */
+  
+  free((char *)item);
+}
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/**************************************************************************/
+/* Magnify an XImage using bilinear interpolation                         */
+/**************************************************************************/
+
+static XImage *XRotMagnifyImage(Display *dpy, XImage *ximage)
+{
+  int i, j;
+  double x, y;
+  double u,t;
+  XImage *I_out;
+  int cols_in, rows_in;
+  int cols_out, rows_out;
+  register int i2, j2;
+  double z1, z2, z3, z4;
+  int byte_width_in, byte_width_out;
+  double mag_inv;
+  
+  /* size of input image */
+  cols_in=ximage->width;
+  rows_in=ximage->height;
+  
+  /* size of final image */
+  cols_out=(double)cols_in*style.magnify;
+  rows_out=(double)rows_in*style.magnify;
+  
+  /* this will hold final image */
+  I_out=MakeXImage(dpy, cols_out, rows_out);
+  if(I_out==NULL)
+    return NULL;
+  
+  /* width in bytes of input, output images */
+  byte_width_in=(cols_in-1)/8+1;
+  byte_width_out=(cols_out-1)/8+1;
+  
+  /* for speed */
+  mag_inv=1./style.magnify;
+  
+  y=0.;
+  
+  /* loop over magnified image */
+  for(j2=0; j2<rows_out; j2++) 
+  {
+    x=0;
+    j=y;
+    
+    for(i2=0; i2<cols_out; i2++) 
+    {
+      i=x;
+      
+      /* bilinear interpolation - where are we on bitmap ? */
+      /* right edge */
+      if(i==cols_in-1 && j!=rows_in-1) 
+      {
+        t=0;
+        u=y-(double)j;
+        
+        z1=(ximage->data[j*byte_width_in+i/8] & 128>>(i%8))>0;
+        z2=z1;
+        z3=(ximage->data[(j+1)*byte_width_in+i/8] & 128>>(i%8))>0;
+        z4=z3;
+      }
+      /* top edge */
+      else if(i!=cols_in-1 && j==rows_in-1) 
+      {
+        t=x-(double)i;
+        u=0;
+        
+        z1=(ximage->data[j*byte_width_in+i/8] & 128>>(i%8))>0;
+        z2=(ximage->data[j*byte_width_in+(i+1)/8] & 128>>((i+1)%8))>0;
+        z3=z2;
+        z4=z1;
+      }
+      /* top right corner */
+      else if(i==cols_in-1 && j==rows_in-1) 
+      {
+        u=0;
+        t=0;
+        
+        z1=(ximage->data[j*byte_width_in+i/8] & 128>>(i%8))>0;
+        z2=z1;
+        z3=z1;
+        z4=z1;
+      }
+      /* somewhere `safe' */
+      else 
+      {
+        t=x-(double)i;
+        u=y-(double)j;
+        
+        z1=(ximage->data[j*byte_width_in+i/8] & 128>>(i%8))>0;
+        z2=(ximage->data[j*byte_width_in+(i+1)/8] & 128>>((i+1)%8))>0;
+        z3=(ximage->data[(j+1)*byte_width_in+(i+1)/8] &
+          128>>((i+1)%8))>0;
+        z4=(ximage->data[(j+1)*byte_width_in+i/8] & 128>>(i%8))>0;
+      }
+      
+      /* if interpolated value is greater than 0.5, set bit */
+      if(((1-t)*(1-u)*z1 + t*(1-u)*z2 + t*u*z3 + (1-t)*u*z4)>0.5)
+        I_out->data[j2*byte_width_out+i2/8]|=128>>i2%8;
+      
+      x+=mag_inv;
+    }
+    y+=mag_inv;
+  }
+  
+  /* destroy original */
+  XDestroyImage(ximage);
+  
+  /* return big image */
+  return I_out;
+}
+
+
+
+
+/**************************************************************************/
+/* Return version/copyright information                                   */
+/**************************************************************************/
+
+double   XRotVersion(char* str, int n)
+{
+  if(str!=NULL)
+    strncpy(str, XV_COPYRIGHT, n);
+  return XV_VERSION;
+}
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/**************************************************************************/
+/* Set the font magnification factor for all subsequent operations        */
+/**************************************************************************/
+
+void XRotSetMagnification(double m)
+{
+  if(m>0.)
+    style.magnify=m;
+}
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/**************************************************************************/
+/* Set the padding used when calculating bounding boxes                   */
+/**************************************************************************/
+
+void XRotSetBoundingBoxPad(int p)
+{
+  if(p>=0)
+    style.bbx_pad=p;
+}
+
+
+/* ---------------------------------------------------------------------- */
+
+
+/**************************************************************************/
+/* Calculate the bounding box some text will have when painted            */
+/**************************************************************************/
+
+XPoint *XRotTextExtents(Display* dpy, XFontStruct* font, double angle, int x, int y, const char* text, int align)
+{
+  register int i;
+  char *str1, *str2, *str3;
+  char *str2_a="\0", *str2_b="\n\0";
+  int height;
+  double sin_angle, cos_angle;
+  int nl, max_width;
+  int cols_in, rows_in;
+  double hot_x, hot_y;
+  XPoint *xp_in, *xp_out;
+  int dir, asc, desc;
+  XCharStruct overall;
+  
+  /* manipulate angle to 0<=angle<360 degrees */
+  while(angle<0)
+    angle+=360;
+  
+  while(angle>360)
+    angle-=360;
+  
+  angle*=M_PI/180;
+  
+  /* count number of sections in string */
+  nl=1;
+  if(align!=XR_LEFT)
+    for(i=0; i<strlen(text)-1; i++)
+      if(text[i]=='\n')
+        nl++;
+      
+  /* ignore newline characters if not doing alignment */
+  if(align==XR_LEFT)
+    str2=str2_a;
+  else
+    str2=str2_b;
+  
+  /* find width of longest section */
+  str1=my_strdup(text);
+  if(str1==NULL)
+    return NULL;
+  
+  str3=my_strtok(str1, str2);
+  
+  XTextExtents(font, str3, strlen(str3), &dir, &asc, &desc,
+    &overall);
+  
+  max_width=overall.rbearing;
+  
+  /* loop through each section */
+  do 
+  {
+    str3=my_strtok((char *)NULL, str2);
+    
+    if(str3!=NULL) 
+    {
+      XTextExtents(font, str3, strlen(str3), &dir, &asc, &desc,
+        &overall);
+      
+      if(overall.rbearing>max_width)
+        max_width=overall.rbearing;
+    }
+  } while(str3!=NULL);
+  
+  free(str1);
+  
+  /* overall font height */
+  height=font->ascent+font->descent;
+  
+  /* dimensions horizontal text will have */
+  cols_in=max_width;
+  rows_in=nl*height;
+  
+  /* pre-calculate sin and cos */
+  sin_angle=sin(angle);
+  cos_angle=cos(angle);
+  
+  /* y position */
+  if(align==XR_TLEFT || align==XR_TCENTRE || align==XR_TRIGHT)
+    hot_y=(double)rows_in/2*style.magnify;
+  else if(align==XR_MLEFT || align==XR_MCENTRE || align==XR_MRIGHT)
+    hot_y=0;
+  else if(align==XR_BLEFT || align==XR_BCENTRE || align==XR_BRIGHT)
+    hot_y=-(double)rows_in/2*style.magnify;
+  else
+    hot_y=-((double)rows_in/2-(double)font->descent)*style.magnify;
+  
+  /* x position */
+  if(align==XR_TLEFT || align==XR_MLEFT || align==XR_BLEFT || align==XR_LEFT)
+    hot_x=-(double)max_width/2*style.magnify;
+  else if(align==XR_TCENTRE || align==XR_MCENTRE || align==XR_BCENTRE || align==XR_CENTRE)
+    hot_x=0;
+  else
+    hot_x=(double)max_width/2*style.magnify;
+  
+  /* reserve space for XPoints */
+  xp_in=(XPoint *)malloc((unsigned)(5*sizeof(XPoint)));
+  if(!xp_in)
+    return NULL;
+  
+  xp_out=(XPoint *)malloc((unsigned)(5*sizeof(XPoint)));
+  if(!xp_out)
+    return NULL;
+  
+  /* bounding box when horizontal, relative to bitmap centre */
+  xp_in[0].x=-(double)cols_in*style.magnify/2-style.bbx_pad;
+  xp_in[0].y= (double)rows_in*style.magnify/2+style.bbx_pad;
+  xp_in[1].x= (double)cols_in*style.magnify/2+style.bbx_pad;
+  xp_in[1].y= (double)rows_in*style.magnify/2+style.bbx_pad;
+  xp_in[2].x= (double)cols_in*style.magnify/2+style.bbx_pad;
+  xp_in[2].y=-(double)rows_in*style.magnify/2-style.bbx_pad;
+  xp_in[3].x=-(double)cols_in*style.magnify/2-style.bbx_pad;
+  xp_in[3].y=-(double)rows_in*style.magnify/2-style.bbx_pad;
+  xp_in[4].x=xp_in[0].x;
+  xp_in[4].y=xp_in[0].y;
+  
+  /* rotate and translate bounding box */
+  for(i=0; i<5; i++) 
+  {
+    xp_out[i].x=(double)x + ( ((double)xp_in[i].x-hot_x)*cos_angle +
+      ((double)xp_in[i].y+hot_y)*sin_angle);
+
+    xp_out[i].y=(double)y + (-((double)xp_in[i].x-hot_x)*sin_angle +
+      ((double)xp_in[i].y+hot_y)*cos_angle);
+  }
+  
+  free((char *)xp_in);
+  
+  return xp_out;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/**************************************************************************/
+/*  Aligns and paints a rotated string                                    */
+/**************************************************************************/
+
+int XRotDrawString(Display* dpy, XFontStruct* font, double angle, Drawable drawable, GC gc, int x, int y, const char* text, int align, int bg)
+{
+  int i;
+  GC my_gc;
+  int xp, yp;
+  double hot_x, hot_y;
+  double hot_xp, hot_yp;
+  double sin_angle, cos_angle;
+  RotatedTextItem *item;
+  Pixmap bitmap_to_paint;
+  
+  /* return early for NULL/empty strings */
+  if(text==NULL)
+    return 0;
+  
+  if(strlen(text)==0)
+    return 0;
+  
+  /* manipulate angle to 0<=angle<360 degrees */
+  while(angle<0)
+    angle+=360;
+  
+  while(angle>=360)
+    angle-=360;
+  
+  angle*=M_PI/180;
+  
+  /* horizontal text made easy */
+  if(angle==0. && style.magnify==1.) 
+    return(XRotDrawHorizontalString(dpy, font, drawable, gc, x, y, text, align, bg));
+  
+  /* get a rotated bitmap */
+  item=XRotRetrieveFromCache(dpy, font, angle, text, align);
+  if(item==NULL)
+    return 0;
+  
+  /* this gc has similar properties to the user's gc */
+  my_gc=XCreateGC(dpy, drawable, 0, 0);
+  XCopyGC(dpy, gc, GCForeground|GCBackground|GCFunction|GCPlaneMask, my_gc);
+  
+    /* alignment : which point (hot_x, hot_y) relative to bitmap centre
+  coincides with user's specified point? */
+  
+  /* y position */
+  if(align==XR_TLEFT || align==XR_TCENTRE || align==XR_TRIGHT)
+    hot_y=(double)item->rows_in/2*style.magnify;
+  else if(align==XR_MLEFT || align==XR_MCENTRE || align==XR_MRIGHT)
+    hot_y=0;
+  else if(align==XR_BLEFT || align==XR_BCENTRE || align==XR_BRIGHT)
+    hot_y=-(double)item->rows_in/2*style.magnify;
+  else
+    hot_y=-((double)item->rows_in/2-(double)font->descent)*style.magnify;
+  
+  /* x position */
+  if(align==XR_TLEFT || align==XR_MLEFT || align==XR_BLEFT || align==XR_LEFT)
+    hot_x=-(double)item->max_width/2*style.magnify;
+  else if(align==XR_TCENTRE || align==XR_MCENTRE || align==XR_BCENTRE || align==XR_CENTRE)
+    hot_x=0;
+  else
+    hot_x=(double)item->max_width/2*style.magnify;
+  
+  /* pre-calculate sin and cos */
+  sin_angle=sin(angle);
+  cos_angle=cos(angle);
+  
+  /* rotate hot_x and hot_y around bitmap centre */
+  hot_xp= hot_x*cos_angle - hot_y*sin_angle;
+  hot_yp= hot_x*sin_angle + hot_y*cos_angle;
+  
+  /* text background will be drawn using XFillPolygon */
+  if(bg) 
+  {
+    GC depth_one_gc;
+    XPoint *xpoints;
+    Pixmap empty_stipple;
+    
+    /* reserve space for XPoints */
+    xpoints=(XPoint *)malloc((unsigned)(4*item->nl*sizeof(XPoint)));
+    if(!xpoints)
+      return 1;
+    
+    /* rotate corner positions */
+    for(i=0; i<4*item->nl; i++) 
+    {
+      xpoints[i].x=(double)x + ( (item->corners_x[i]-hot_x)*cos_angle + 
+        (item->corners_y[i]+hot_y)*sin_angle);
+
+      xpoints[i].y=(double)y + (-(item->corners_x[i]-hot_x)*sin_angle + 
+        (item->corners_y[i]+hot_y)*cos_angle);
+    }
+    
+    /* we want to swap foreground and background colors here;
+    XGetGCValues() is only available in R4+ */
+    
+    empty_stipple=XCreatePixmap(dpy, drawable, 1, 1, 1);
+    
+    depth_one_gc=XCreateGC(dpy, empty_stipple, 0, 0);
+    XSetForeground(dpy, depth_one_gc, 0);
+    XFillRectangle(dpy, empty_stipple, depth_one_gc, 0, 0, 2, 2);
+    
+    XSetStipple(dpy, my_gc, empty_stipple);
+    XSetFillStyle(dpy, my_gc, FillOpaqueStippled);
+    
+    XFillPolygon(dpy, drawable, my_gc, xpoints, 4*item->nl, Nonconvex,
+      CoordModeOrigin);
+    
+    /* free our resources */
+    free((char *)xpoints);
+    XFreeGC(dpy, depth_one_gc);
+    XFreePixmap(dpy, empty_stipple);
+  }
+  
+  /* where should top left corner of bitmap go ? */
+  xp=(double)x-((double)item->cols_out/2 +hot_xp);
+  yp=(double)y-((double)item->rows_out/2 -hot_yp);
+  
+  /* by default we draw the rotated bitmap, solid */
+  bitmap_to_paint=item->bitmap;
+  
+  /* handle user stippling */
+#ifndef X11R3
+  {
+    GC depth_one_gc;
+    XGCValues values;
+    Pixmap new_bitmap, inverse;
+    
+    /* try and get some GC properties */
+    if(XGetGCValues(dpy, gc, 
+      GCStipple|GCFillStyle|GCForeground|GCBackground|
+      GCTileStipXOrigin|GCTileStipYOrigin,
+      &values)) 
+    {
+      /* only do this if stippling requested */
+      if((values.fill_style==FillStippled ||
+        values.fill_style==FillOpaqueStippled) && !bg) 
+      {
+        /* opaque stipple: draw rotated text in background colour */
+        if(values.fill_style==FillOpaqueStippled) 
+        {
+          XSetForeground(dpy, my_gc, values.background);
+          XSetFillStyle(dpy, my_gc, FillStippled);
+          XSetStipple(dpy, my_gc, item->bitmap);
+          XSetTSOrigin(dpy, my_gc, xp, yp);
+          XFillRectangle(dpy, drawable, my_gc, xp, yp,
+            item->cols_out, item->rows_out);
+          XSetForeground(dpy, my_gc, values.foreground);
+        }
+        
+        /* this will merge the rotated text and the user's stipple */
+        new_bitmap=XCreatePixmap(dpy, drawable,
+          item->cols_out, item->rows_out, 1);
+        
+        /* create a GC */
+        depth_one_gc=XCreateGC(dpy, new_bitmap, 0, 0);
+        XSetForeground(dpy, depth_one_gc, 1);
+        XSetBackground(dpy, depth_one_gc, 0);
+        
+        /* set the relative stipple origin */
+        XSetTSOrigin(dpy, depth_one_gc, 
+          values.ts_x_origin-xp, values.ts_y_origin-yp);
+        
+        /* fill the whole bitmap with the user's stipple */
+        XSetStipple(dpy, depth_one_gc, values.stipple);
+        XSetFillStyle(dpy, depth_one_gc, FillOpaqueStippled);
+        XFillRectangle(dpy, new_bitmap, depth_one_gc,
+          0, 0, item->cols_out, item->rows_out);
+        
+        /* set stipple origin back to normal */
+        XSetTSOrigin(dpy, depth_one_gc, 0, 0);
+        
+        /* this will contain an inverse copy of the rotated text */
+        inverse=XCreatePixmap(dpy, drawable,
+          item->cols_out, item->rows_out, 1);
+        
+        /* invert text */
+        XSetFillStyle(dpy, depth_one_gc, FillSolid);
+        XSetFunction(dpy, depth_one_gc, GXcopyInverted);
+        XCopyArea(dpy, item->bitmap, inverse, depth_one_gc,
+          0, 0, item->cols_out, item->rows_out, 0, 0);
+        
+        /* now delete user's stipple everywhere EXCEPT on text */
+        XSetForeground(dpy, depth_one_gc, 0);
+        XSetBackground(dpy, depth_one_gc, 1);
+        XSetStipple(dpy, depth_one_gc, inverse);
+        XSetFillStyle(dpy, depth_one_gc, FillStippled);
+        XSetFunction(dpy, depth_one_gc, GXcopy);
+        XFillRectangle(dpy, new_bitmap, depth_one_gc,
+          0, 0, item->cols_out, item->rows_out);
+        
+        /* free resources */
+        XFreePixmap(dpy, inverse);
+        XFreeGC(dpy, depth_one_gc);
+        
+        /* this is the new bitmap */
+        bitmap_to_paint=new_bitmap;
+      }
+    }
+  }
+#endif /*X11R3*/
+  
+  /* paint text using stipple technique */
+  XSetFillStyle(dpy, my_gc, FillStippled);
+  XSetStipple(dpy, my_gc, bitmap_to_paint);
+  XSetTSOrigin(dpy, my_gc, xp, yp);
+  XFillRectangle(dpy, drawable, my_gc, xp, yp, 
+    item->cols_out, item->rows_out);
+  
+  /* free our resources */
+  XFreeGC(dpy, my_gc);
+  
+  /* stippled bitmap no longer needed */
+  if(bitmap_to_paint!=item->bitmap)
+    XFreePixmap(dpy, bitmap_to_paint);
+  
+#ifdef CACHE_XIMAGES
+  XFreePixmap(dpy, item->bitmap);
+#endif /*CACHE_XIMAGES*/
+  
+  /* if item isn't cached, destroy it completely */
+  if(!item->cached) 
+    XRotFreeTextItem(dpy,item);
+  
+  /* we got to the end OK! */
+  return 0;
+}
+
+
diff --git a/src/x11/xvertex.h b/src/x11/xvertex.h
new file mode 100644
index 0000000..b1b4e3a
--- /dev/null
+++ b/src/x11/xvertex.h
@@ -0,0 +1,31 @@
+/* ************************************************************************ */
+/* Header file for the `xvertext 5.0' routines.
+
+   Copyright (c) 1993 Alan Richardson (mppa3@uk.ac.sussex.syma) */
+/* ************************************************************************ */
+
+#ifndef __XVERTEXT_H 
+#define __XVERTEXT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+#define XV_VERSION      5.0
+#define XV_COPYRIGHT \
+      "xvertext routines Copyright (c) 1993 Alan Richardson"
+
+/* text alignment */
+enum {XR_LEFT, XR_CENTRE, XR_RIGHT, XR_TLEFT, XR_TCENTRE, XR_TRIGHT, XR_MLEFT, XR_MCENTRE, XR_MRIGHT, XR_BLEFT, XR_BCENTRE, XR_BRIGHT};
+
+double   XRotVersion(char* str, int n);
+void    XRotSetMagnification(double m);
+void    XRotSetBoundingBoxPad(int p);
+XPoint *XRotTextExtents(Display* dpy, XFontStruct* font, double angle, int x, int y, const char* text, int align);
+int     XRotDrawString(Display* dpy, XFontStruct* font, double angle, Drawable drawable, GC gc, int x, int y, const char* text, int align, int bg);
+
+#ifdef __cplusplus
+}
+#endif 
+
+#endif /* _XVERTEXT_INCLUDED_ */