/** * aSrcRect: Rect relative to the aSrc surface * aDestPoint: Point inside aDest surface */ void CopyRect(DataSourceSurface* aSrc, DataSourceSurface* aDest, IntRect aSrcRect, IntPoint aDestPoint) { if (aSrcRect.Overflows() || IntRect(aDestPoint, aSrcRect.Size()).Overflows()) { MOZ_CRASH("we should never be getting invalid rects at this point"); } MOZ_RELEASE_ASSERT(aSrc->GetFormat() == aDest->GetFormat(), "different surface formats"); MOZ_RELEASE_ASSERT(IntRect(IntPoint(), aSrc->GetSize()).Contains(aSrcRect), "source rect too big for source surface"); MOZ_RELEASE_ASSERT(IntRect(IntPoint(), aDest->GetSize()).Contains(IntRect(aDestPoint, aSrcRect.Size())), "dest surface too small"); if (aSrcRect.IsEmpty()) { return; } DataSourceSurface::ScopedMap srcMap(aSrc, DataSourceSurface::READ); DataSourceSurface::ScopedMap destMap(aDest, DataSourceSurface::WRITE); if (MOZ2D_WARN_IF(!srcMap.IsMapped() || !destMap.IsMapped())) { return; } uint8_t* sourceData = DataAtOffset(aSrc, srcMap.GetMappedSurface(), aSrcRect.TopLeft()); uint32_t sourceStride = srcMap.GetStride(); uint8_t* destData = DataAtOffset(aDest, destMap.GetMappedSurface(), aDestPoint); uint32_t destStride = destMap.GetStride(); if (BytesPerPixel(aSrc->GetFormat()) == 4) { for (int32_t y = 0; y < aSrcRect.height; y++) { PodCopy((int32_t*)destData, (int32_t*)sourceData, aSrcRect.width); sourceData += sourceStride; destData += destStride; } } else if (BytesPerPixel(aSrc->GetFormat()) == 1) { for (int32_t y = 0; y < aSrcRect.height; y++) { PodCopy(destData, sourceData, aSrcRect.width); sourceData += sourceStride; destData += destStride; } } }