[Webkit-unassigned] [Bug 66382] LayerTilerChromium: Grow layers with tile granularity

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Aug 17 12:04:44 PDT 2011


https://bugs.webkit.org/show_bug.cgi?id=66382





--- Comment #4 from Sami Kyostila <skyostil at google.com>  2011-08-17 12:04:43 PST ---
I'm seeing partial tiles (and tile textures) along the viewport edges, i.e., not layer edges like you meant?. This is a problem because when a tile is invalidated or resized, it needs to be completely redrawn. This means that when scrolling slowly, all tiles along the leading viewport edge are continually being refreshed from scratch, causing lots of redundant WebKit rendering.

What my patch does is opportunistically grows the layer one tile beyond the viewport, so that a new row of tiles only needs to be generated for every 'tilesize' pixels scrolled.

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