[Webkit-unassigned] [Bug 125145] New: [CSS Grid Layout] Speed up painting of large grids

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=125145

           Summary: [CSS Grid Layout] Speed up painting of large grids
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: svillar at igalia.com


Bug 123989 tracked improvements in laying out grid items in large grids. Next step is to reduce also the painting time.

The idea is to try to use our knowledge about the grid structure in order to perform the smallest amount of paint operations as possible. This was already being done in blink, the tracking issue is this one http://code.google.com/p/chromium/issues/detail?id=248151.

My idea is to merge Blink's r155262 and r157993. Regarding the issue with overflowing grid items I proposed a better fix in blink herehttps://codereview.chromium.org/98563003/. I'd follow that approach in WebKit too.

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