[Webkit-unassigned] [Bug 98396] New: [CSS Shaders] Make custom filters use a premultiplied buffer for performance optimization.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=98396

           Summary: [CSS Shaders] Make custom filters use a premultiplied
                    buffer for performance optimization.
           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: luxtella at company100.net


There are three benefits when FECustomFilter uses a premultiplied buffer.
1. FilterEffect::asImageBuffer is faster.
2. The fragment shader is faster as reducing a division by alpha.
3. In the future when AC implementaions uses FECustomFilter, the implementations do not need to convert unmultiplied buffer to premultiplied buffer.

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