if (!ValidClippedRectangle(src_bitmap, &src_x, &src_y, &width, &height) ||
!ValidClippedRectangle(dst_bitmap, &dst_x, &dst_y, &width, &height))
return;
if (!ValidClippedRectangle(src_bitmap, &src_x, &src_y, &width, &height) ||
!ValidClippedRectangle(dst_bitmap, &dst_x, &dst_y, &width, &height))
return;