NEW 231169
[Performance] Optimize RenderLayer::calculateRects 
https://bugs.webkit.org/show_bug.cgi?id=231169
Summary [Performance] Optimize RenderLayer::calculateRects
cathiechen
Reported 2021-10-04 07:39:55 PDT
Optimize the performance of RenderLayer::calculateRects
Attachments
Patch (7.39 KB, patch)
2021-10-06 06:30 PDT, cathiechen 		simon.fraser: review-
DetailsFormatted DiffDiff
screenshot-of-optimized-collectRects (597.97 KB, image/png)
2021-10-06 06:34 PDT, cathiechen 		no flags
Details
screenshot-of-original-collectRects (604.42 KB, image/png)
2021-10-06 06:38 PDT, cathiechen 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
cathiechen
Comment 1 2021-10-06 06:30:44 PDT
Created attachment 440356 [details] Patch
cathiechen
Comment 2 2021-10-06 06:33:08 PDT
Here are the percentage of RenderLayer::calculateRects * Original: 24.1%, 25.7%, 25% * This patch: 14.9%, 14.9%, 16.0%
cathiechen
Comment 3 2021-10-06 06:34:56 PDT
Created attachment 440357 [details] screenshot-of-optimized-collectRects
cathiechen
Comment 4 2021-10-06 06:38:46 PDT
Created attachment 440358 [details] screenshot-of-original-collectRects
Simon Fraser (smfr)
Comment 5 2021-10-06 21:00:29 PDT
Comment on attachment 440356 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=440356&action=review > Source/WebCore/rendering/RenderLayer.cpp:4630 > + bool backgroundRectNotNeedRepaint = !hasBackgroundClipRect > + && m_repaintRectsValid > + && !m_repaintRects.clippedOverflowRect.intersects(backgroundRect.rect()) > + && !m_repaintRects.outlineBoundsRect.intersects(backgroundRect.rect()); This seems wrong. Clip rect computation should be independent of cached repaint rects, and this code is not about needing repaint.
cathiechen
Comment 6 2021-10-06 21:12:12 PDT
Comment on attachment 440356 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=440356&action=review >> Source/WebCore/rendering/RenderLayer.cpp:4630 >> + && !m_repaintRects.outlineBoundsRect.intersects(backgroundRect.rect()); > > This seems wrong. Clip rect computation should be independent of cached repaint rects, and this code is not about needing repaint. Hmm, it seems if backgroundRect or foregroundRect doesn't intersect with repaint rests, then they can't intersect with these rects: overflowClipRect, clipRect, or borderBoxRect. The repaint rests always cover these rests, no?
Radar WebKit Bug Importer
Comment 7 2021-10-11 07:40:24 PDT
<rdar://problem/84098726>
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