265365 2023-11-27 01:37:55 -0800 [CoordinatedGraphics] Canvas 2D rendering context causes unnecessary tile invalidations 2023-11-27 07:03:14 -0800 1 1 1 Unclassified WebKit Canvas WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 jani webkit-unassigned dino webkit-bug-importer oldest_to_newest 1994886 0 jani 2023-11-27 01:37:55 -0800 CanvasRenderingContext2DBase tracks one dirty rect and does union of all incoming dirty rects within repaint cycle. In coordinated graphics, canvas is tiled and this unification of rects causes unnecessary invalidation of tiles which are not dirty. For example in case where canvas spans over multiple tiles and only small areas at top-left and bottom-right corners of canvas are changed. This scenario causes whole canvas and all tiles to be marked dirty because of unification of dirty areas although only top-left and bottom-right tiles are actually dirty. 1994887 1 jani 2023-11-27 01:44:40 -0800 In coordinated graphics tiles do dirty rect unification internally 1994888 2 jani 2023-11-27 01:50:17 -0800 Pull request: https://github.com/WebKit/WebKit/pull/20917 1994923 3 ews-feeder 2023-11-27 07:02:03 -0800 Committed 271139@main (b2410e35eca0): <https://commits.webkit.org/271139@main> Reviewed commits have been landed. Closing PR #20917 and removing active labels. 1994924 4 webkit-bug-importer 2023-11-27 07:03:14 -0800 <rdar://problem/118832308>