static void gif_copy_img_rect(const uint32_t *src, uint32_t *dst, int linesize, int l, int t, int w, int h) { const int y_start = t * linesize; const uint32_t *src_px, *src_pr, *src_py = src + y_start, *dst_py = dst + y_start; const uint32_t *src_pb = src_py + t * linesize; uint32_t *dst_px; for (; src_py < src_pb; src_py += linesize, dst_py += linesize) { src_px = src_py + l; dst_px = (uint32_t *)dst_py + l; src_pr = src_px + w; for (; src_px < src_pr; src_px++, dst_px++) *dst_px = *src_px; } }