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[Bug 12716] New: Porter duff names are confusing and currently not implemented consistently. Suggest using A*B + C*D formula. Where A,B,C,D can be Source, Destination, Source Alpha, DestAlpha, 0, 1, Inverse Source Alpha, Inverse Dest Alpha, and so on, similar to OpenGL/We

From: <bugzilla@jessica.w3.org>
Date: Sun, 22 May 2011 05:27:47 +0000
To: public-html@w3.org
Message-ID: <bug-12716-2495@http.www.w3.org/Bugs/Public/>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=12716

           Summary: Porter duff names are confusing and currently not
                    implemented consistently. Suggest using A*B + C*D
                    formula. Where A,B,C,D can be Source, Destination,
                    Source Alpha, DestAlpha, 0, 1, Inverse Source Alpha,
                    Inverse Dest Alpha, and so on, similar to OpenGL/We
           Product: HTML WG
           Version: unspecified
          Platform: Other
               URL: http://www.whatwg.org/specs/web-apps/current-work/#dom
                    -context-2d-globalcompositeoperation
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P3
         Component: HTML Canvas 2D Context (editor: Ian Hickson)
        AssignedTo: ian@hixie.ch
        ReportedBy: contributor@whatwg.org
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-wg-issue-tracking@w3.org,
                    public-html@w3.org


Specification:
http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html
Section:
http://www.whatwg.org/specs/web-apps/current-work/complete.html#dom-context-2d-globalcompositeoperation

Comment:
Porter duff names are confusing and currently not implemented consistently.
Suggest using A*B + C*D formula. Where A,B,C,D can be Source, Destination,
Source Alpha, DestAlpha, 0, 1, Inverse Source Alpha, Inverse Dest Alpha, and
so on, similar to OpenGL/WebGL alpha blending.

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Received on Sunday, 22 May 2011 05:27:49 UTC

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