Fix bug where offscreen layers would erroneously draw black pixels#55762
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Abbondanzo wants to merge 1 commit intofacebook:mainfrom
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Fix bug where offscreen layers would erroneously draw black pixels#55762Abbondanzo wants to merge 1 commit intofacebook:mainfrom
Abbondanzo wants to merge 1 commit intofacebook:mainfrom
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…acebook#55762) Summary: On API <= 28, `clipWithAntiAliasing` uses `saveLayer` for anti-aliased border radius clipping. When a view is partially off-screen, the GPU only renders into the visible portion of the `saveLayer` buffer, leaving off-screen pixels as opaque black. These black pixels survive Porter-Duff compositing and appear as visible artifacts. Adding `canvas.clipRect(0, 0, view.width, view.height)` before `saveLayer` forces HWUI to properly initialize the offscreen buffer relative to the GPU scissor. The clip is in local coordinates, so it stays correct across parent transform animations and scrolling offsets. Changelog: [Internal] Reviewed By: NickGerleman Differential Revision: D94447724
…acebook#55762) Summary: On API <= 28, `clipWithAntiAliasing` uses `saveLayer` for anti-aliased border radius clipping. When a view is partially off-screen, the GPU only renders into the visible portion of the `saveLayer` buffer, leaving off-screen pixels as opaque black. These black pixels survive Porter-Duff compositing and appear as visible artifacts. Adding `canvas.clipRect(0, 0, view.width, view.height)` before `saveLayer` forces HWUI to properly initialize the offscreen buffer relative to the GPU scissor. The clip is in local coordinates, so it stays correct across parent transform animations and scrolling offsets. Changelog: [Internal] Reviewed By: NickGerleman Differential Revision: D94447724
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Summary:
On API <= 28,
clipWithAntiAliasingusessaveLayerfor anti-aliased border radius clipping. When a view is partially off-screen, the GPU only renders into the visible portion of thesaveLayerbuffer, leaving off-screen pixels as opaque black. These black pixels survive Porter-Duff compositing and appear as visible artifacts.Adding
canvas.clipRect(0, 0, view.width, view.height)beforesaveLayerforces HWUI to properly initialize the offscreen buffer relative to the GPU scissor. The clip is in local coordinates, so it stays correct across parent transform animations and scrolling offsets.Changelog: [Internal]
Differential Revision: D94447724