gboolean colors_too_similar(const GdkColor *colora, const GdkColor *colorb)
{
  return (abs(colora->red - colorb->red) < 256 &&
	  abs(colora->green - colorb->green) < 256 &&
	  abs(colora->blue - colorb->blue) < 256);
}

/* gdk_cursor_new_from_pixmap is broken on Windows.
   this is a workaround using gdk_cursor_new_from_pixbuf. */
#ifdef WIN32
GdkCursor* fixed_gdk_cursor_new_from_pixmap(GdkPixmap *source, GdkPixmap *mask,
					    const GdkColor *fg, const GdkColor *bg,
					    gint x, gint y) 
{
  GdkPixmap *rgb_pixmap;
  GdkGC *gc;
  GdkPixbuf *rgb_pixbuf, *rgba_pixbuf;
  GdkCursor *cursor;
  int width, height;

  /* HACK!  It seems impossible to work with RGBA pixmaps directly in
     GDK-Win32.  Instead we pick some third color, different from fg
     and bg and use that as the 'transparent color'.  We do this using
     colors_too_similar (see above) because two colors could be
     unequal in GdkColor's 16-bit/sample, but equal in GdkPixbuf's
     8-bit/sample. */
  GdkColor candidates[3] = {{0,65535,0,0}, {0,0,65535,0}, {0,0,0,65535}};
  GdkColor *trans = &candidates[0];
  if (colors_too_similar(trans, fg) || colors_too_similar(trans, bg)) {
    trans = &candidates[1];
    if (colors_too_similar(trans, fg) || colors_too_similar(trans, bg)) {
      trans = &candidates[2]; 
    }
  } /* trans is now guaranteed to be unique from fg and bg */

  /* create an empty pixmap to hold the cursor image */
  gdk_drawable_get_size(source, &width, &height);
  rgb_pixmap = gdk_pixmap_new(NULL, width, height, 24);

  /* blit the bitmaps defining the cursor onto a transparent background */
  gc = gdk_gc_new(rgb_pixmap);
  gdk_gc_set_fill(gc, GDK_SOLID);
  gdk_gc_set_rgb_fg_color(gc, trans);
  gdk_draw_rectangle(rgb_pixmap, gc, TRUE, 0, 0, width, height);
  gdk_gc_set_fill(gc, GDK_OPAQUE_STIPPLED);
  gdk_gc_set_stipple(gc, source);
  gdk_gc_set_clip_mask(gc, mask);
  gdk_gc_set_rgb_fg_color(gc, fg);
  gdk_gc_set_rgb_bg_color(gc, bg);
  gdk_draw_rectangle(rgb_pixmap, gc, TRUE, 0, 0, width, height);
  gdk_gc_unref(gc);

  /* create a cursor out of the created pixmap */
  rgb_pixbuf = gdk_pixbuf_get_from_drawable(NULL, rgb_pixmap, gdk_colormap_get_system(),
					    0, 0, 0, 0, width, height);
  gdk_pixmap_unref(rgb_pixmap);
  rgba_pixbuf = gdk_pixbuf_add_alpha(rgb_pixbuf, TRUE, trans->red, trans->green, trans->blue);
  gdk_pixbuf_unref(rgb_pixbuf);
  cursor = gdk_cursor_new_from_pixbuf(gdk_display_get_default(), rgba_pixbuf, x, y);
  gdk_pixbuf_unref(rgba_pixbuf);

  return cursor;
}
#else

#define fixed_gdk_cursor_new_from_pixmap gdk_cursor_new_from_pixmap

#endif
