[Webkit-unassigned] [Bug 98504] New: [CSS Shaders] Implement overlay, color-dodge, color-burn, hard-light, soft-light blend modes.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=98504

           Summary: [CSS Shaders] Implement overlay, color-dodge,
                    color-burn, hard-light, soft-light blend modes.
           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


Implement the overlay, color-dodge, color-burn, hard-light and soft-light blend mode in the CSS Shaders mix function. For example:
-webkit-filter: custom(none mix(shader.fs multiply));

This will blend the special css_MixColor symbol in the fragment shader with the DOM element texture.

This bug is follow-up of Bug 93870 to implement all of the following: overlay, color-dodge, color-burn, hard-light and soft-light.

CSS Shaders can support all of Separable blend modes after this bug. This bug does not cover Non-separable blend modes, which is tricky to implement.

https://dvcs.w3.org/hg/FXTF/rawfile/tip/compositing/index.html#blendingseparable
https://dvcs.w3.org/hg/FXTF/rawfile/tip/compositing/index.html#blendingnonseparable

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