void WebPCopyPixels(const WebPPicture* const src, WebPPicture* const dst) {
assert(src != NULL && dst != NULL);
assert(src->width == dst->width && src->height == dst->height);
assert(src->use_argb && dst->use_argb);
WebPCopyPlane((uint8_t*)src->argb, 4 * src->argb_stride, (uint8_t*)dst->argb,
4 * dst->argb_stride, 4 * src->width, src->height);
}
void GIFDisposeFrame(GIFDisposeMethod dispose, const GIFFrameRect* const rect,
const WebPPicture* const prev_canvas,
WebPPicture* const curr_canvas) {
assert(rect != NULL);
if (dispose == GIF_DISPOSE_BACKGROUND) {
GIFClearPic(curr_canvas, rect);
} else if (dispose == GIF_DISPOSE_RESTORE_PREVIOUS) {
const size_t src_stride = prev_canvas->argb_stride;
const uint32_t* const src = prev_canvas->argb + rect->x_offset
+ rect->y_offset * src_stride;
const size_t dst_stride = curr_canvas->argb_stride;
uint32_t* const dst = curr_canvas->argb + rect->x_offset
+ rect->y_offset * dst_stride;
assert(prev_canvas != NULL);
WebPCopyPlane((uint8_t*)src, (int)(4 * src_stride),
(uint8_t*)dst, (int)(4 * dst_stride),
4 * rect->width, rect->height);
}
}