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Bug 21199 - Add blend modes to Canvas' globalCompositeOperation
Summary: Add blend modes to Canvas' globalCompositeOperation
Status: NEW
Alias: None
Product: HTML WG
Classification: Unclassified
Component: HTML Canvas 2D Context (show other bugs)
Version: unspecified
Hardware: All All
: P2 normal
Target Milestone: ---
Assignee: Jay Munro
QA Contact: HTML WG Bugzilla archive list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2013-03-05 18:53 UTC by rcabanie
Modified: 2013-03-05 18:57 UTC (History)
3 users (show)

See Also:

Attachments

Description rcabanie 2013-03-05 18:53:19 UTC 

    


    


      



        
          Comment 1
        

        
          rcabanie

        

        
        

        
          2013-03-05 18:57:16 UTC
        

      






The spec (http://www.w3.org/html/wg/drafts/2dcontext/html5_canvas/#compositing) currently defines the set of porter-duff compositing operators.

There is a new specificiation (https://dvcs.w3.org/hg/FXTF/rawfile/default/compositing/index.html#canvascompositingandblending) that extends this flag so you can also specify a blending operation.
The canvas spec should be updated with the new blend modes and a reference to the compositing spec. Alternately, the canvas spec could remove the description of globalCompositeOperation and just refer to the compositing for its definition.