[Webkit-unassigned] [Bug 96698] New: Lots of repaints in the top left tile on this site

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=96698

           Summary: Lots of repaints in the top left tile on this site
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://www.telegraaf.nl/
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com
                CC: andersca at apple.com, timothy_horton at apple.com


Note how, when you load http://www.telegraaf.nl/, the top left tile is continually repainting. If you scroll down you'll see a ticker on the right; deleting this ticker stops the repaints.

But why is the top left tile repainting?

TileCache::setNeedsDisplayInRect() calls:
  getTileIndexRangeForRect(intersection(enclosingIntRect(scaledRect), m_tileCoverageRect), topLeft, bottomRight);

but in some cases intersection(enclosingIntRect(scaledRect), m_tileCoverageRect) returns an empty rect. However, getTileIndexRangeForRect happily returns tile 0,0 in that case, so we dirty the top left tile anyway.

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