[Webkit-unassigned] [Bug 86906] New: GeneratorGeneratedImage should cache intermediate images

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=86906

           Summary: GeneratorGeneratedImage should cache intermediate
                    images
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: timothy_horton at apple.com
                CC: adele at apple.com, simon.fraser at apple.com,
                    dino at apple.com


Some pages include complicated, expensive, large gradients (the only currently implemented GeneratorGeneratedImage). Worse yet, some include them in fixed-position elements, which we currently have to repaint every frame during a scroll.

We should temporarily cache gradients while they're being used to relieve some of this stress on the graphics library.

We have measured significant (>2x!) speedups scrolling some high-profile public sites on the Mac port.

<rdar://problem/11484852>

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