[Webkit-unassigned] [Bug 234606] New: Add support for premultiplied alpha interpolated color stop gradients in the Cairo backend

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234606

            Bug ID: 234606
           Summary: Add support for premultiplied alpha interpolated color
                    stop gradients in the Cairo backend
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit API
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sam at webkit.org

With https://bugs.webkit.org/show_bug.cgi?id=234492, we added support for choosing between premultiplied alpha and unpremultiplied alpha color stop interpolation for Gradient, but only for the CoreGraphics backend.

To support CSS gradients, the Cairo needs to add support for both modes as well (the unpremultiplied case is still needed for SVG and Canvas).

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