[Webkit-unassigned] [Bug 113088] New: [CSS Shaders] Clamp css_MixColor before the blending and compositing steps

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=113088

           Summary: [CSS Shaders] Clamp css_MixColor before the blending
                    and compositing steps
           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: mvujovic at adobe.com
                CC: achicu at adobe.com
            Blocks: 71392


The blending and compositing operations from the spec [1] expect that they are operating on valid color inputs, in the range [0.0, 1.0]. Thus, we should clamp the css_MixColor input to this range to avoid implementation-dependent behavior for invalid color input.

[1]: https://dvcs.w3.org/hg/FXTF/rawfile/tip/compositing/index.html#blending

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