[Webkit-unassigned] [Bug 91007] New: Seams appear when zooming page with absolutely positioned canvas objects

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=91007

           Summary: Seams appear when zooming page with absolutely
                    positioned canvas objects
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: junov at chromium.org


This bug is reproducible in Safari and Chrome with GPU-accelerated canvas rendering.

Load attached "grid bug.html" file in the browser, and zoom the page in or out.
Result -> White grid lines appear and most zoom factors

Seems to be a problem with the compositor's layout algorithm.  The rounding of canvas layers' zoomed size is probably to blame.

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