static void drawFrame(SkBitmap* bm, const SavedImage* frame, const ColorMapObject* cmap)
{
int transparent = -1;
for (int i = 0; i < frame->ExtensionBlockCount; ++i) {
ExtensionBlock* eb = frame->ExtensionBlocks + i;
if (eb->Function == GRAPHICS_EXT_FUNC_CODE &&
eb->ByteCount == 4) {
bool has_transparency = ((eb->Bytes[0] & 1) == 1);
if (has_transparency) {
transparent = (unsigned char)eb->Bytes[3];
}
}
}
if (frame->ImageDesc.ColorMap != NULL) {
// use local color table
cmap = frame->ImageDesc.ColorMap;
}
if (cmap == NULL || cmap->ColorCount != (1 << cmap->BitsPerPixel)) {
SkDEBUGFAIL("bad colortable setup");
return;
}
if (frame->ImageDesc.Interlace) {
blitInterlace(bm, frame, cmap, transparent);
} else {
blitNormal(bm, frame, cmap, transparent);
}
}
static void drawFrame(argb *bm, GifInfo *info, SavedImage *frame) {
ColorMapObject *cmap;
if (frame->ImageDesc.ColorMap != NULL)
cmap = frame->ImageDesc.ColorMap;// use local color table
else if (info->gifFilePtr->SColorMap != NULL)
cmap = info->gifFilePtr->SColorMap;
else
cmap = getDefColorMap();
blitNormal(bm, info, frame, cmap);
}