[Webkit-unassigned] [Bug 89116] New: Specular light filters produce dark results

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=89116

           Summary: Specular light filters produce dark results
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fmalita at chromium.org
                CC: zimmermann at kde.org


Created an attachment (id=147628)
 --> (https://bugs.webkit.org/attachment.cgi?id=147628&action=review)
White light filters should not produce grey rectangles around the target

This is most obvious if the light filter overlay is not clipped (see attached test).

FELighting is applied in unmultiplied space, but the alpha channel is set for premultiplied RGBA. Then when the image is converted to premultiplied for compositing, the RGB values are scaled down resulting in a darker image.

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