[Webkit-unassigned] [Bug 140646] New: Support "plus-darker" in mix-blend mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=140646

            Bug ID: 140646
           Summary: Support "plus-darker" in mix-blend mode
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dino at apple.com

Support for "plus-darker" in mix-blend-mode. Here is the email I sent to public-fx.

https://lists.w3.org/Archives/Public/public-fx/2015JanMar/0021.html

Our designers at Apple often request a blending operation that is not supported in the CSS Compositing and Blending specification: plus-darker. You can find many examples and discussion of this mode if you Bing on the Google.

We’d like to add this mode to Level 2.

Details are here: http://en.wikipedia.org/wiki/Blend_modes#Addition

The math is pretty simple:

R = min(0, (1 - D) + (1 - S))

(We should maybe consider adding plus-lighter as well, and subtractive modes based on designer feedback)

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