67854 2011-09-09 10:14:10 -0700 [chromium] Add a paint aggregator to TiledLayerChromium 2013-04-08 11:14:26 -0700 1 1 1 Unclassified WebKit WebCore Misc. 528+ (Nightly build) Unspecified Unspecified RESOLVED WONTFIX P2 Normal --- 1 enne enne amruthraj enne jamesr shawnsingh vangelis oldest_to_newest 464866 0 enne 2011-09-09 10:14:10 -0700 TiledLayerChromium currently unions all invalidations together before painting the combined region. This is inefficient in certain cases (L-shaped invalidations) and it should support at least some small number of discrete invalidation regions. It should be smart about merging adjacent regions. This is similar to what paint_aggregator.cc does in Chromium. 481689 1 enne 2011-10-11 09:54:16 -0700 As a part of fixing this bug, consider tracking a set of update rects rather than a single update rect per layer so that --show-paint-rects is more accurate. See: https://bugs.webkit.org/show_bug.cgi?id=69441 481744 2 vangelis 2011-10-11 11:12:42 -0700 (In reply to comment #1) > As a part of fixing this bug, consider tracking a set of update rects rather than a single update rect per layer so that --show-paint-rects is more accurate. > > See: https://bugs.webkit.org/show_bug.cgi?id=69441 I'm curious whether a good first approximation would be to register the dirty regions directly with the tiles, instead of doing a union. That way at least we wouldn't be unioning dirty regions across tile borders.