API looks good for partial present. The patch expose dirty rects, but non-dirty rects area are also rendered with the patch. Is it possible not to render non-dirty rects and WR exposes rects that are actually rendered to default frame buffer? It could reduce GPU tasks at WR and RenderCompositorANGLE. The following has related information. https://docs.microsoft.com/en-us/windows/win32/direct3ddxgi/dxgi-1-2-presentation-improvements
Bug 1581650 Comment 2 Edit History
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API looks good for partial present. The patch expose dirty rects, but non-dirty rects area are also rendered by WR with the patch. Is it possible not to render non-dirty rects by WR and WR exposes rects that are actually rendered to default frame buffer? It could reduce GPU tasks at WR and RenderCompositorANGLE. The following has related information. https://docs.microsoft.com/en-us/windows/win32/direct3ddxgi/dxgi-1-2-presentation-improvements