[Webkit-unassigned] [Bug 97745] New: [Cairo] Unnecessary creation of ShareableBitmap's for directly composited images

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=97745

           Summary: [Cairo] Unnecessary creation of ShareableBitmap's for
                    directly composited images
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: helder.correia at nokia.com
                CC: mrobinson at webkit.org, noam.rosenthal at nokia.com


In LayerTreeCoordinator::adoptImageBackingStore(), there is a PLATFORM(QT) code path to check for identical images, but nothing is done for Cairo, which results in the occurrence of avoidable resource allocations. The issue happens in e.g. http://www.webkit.org/blog-files/leaves/, where there are many leaves flying around while they're produced out of only four bitmaps.

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