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Add coverage for blend operations #1822

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@acomminos acomminos commented May 12, 2015

@KyleFung and I from Mozilla have been working on adding coverage for blend operations to Philip Taylor's compositing tests. Please let us know if there are any changes to be made!

acomminos and others added 24 commits May 11, 2015 17:50
…latform-tests into 2dcontext-coverage

Conflicts:
	2dcontext/tools/tests2d.yaml
…latform-tests into 2dcontext-coverage

Conflicts:
	2dcontext/tools/tests2d.yaml
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These tests from @acomminos need review from @junov or other canvas SME. @Ms2ger?

('copy', '1', '0'),
('lighter', '1', '1'),
# Composite operation tests
# <http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2007-March/010608.html>
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This reference is out of date. The current version of the whatwg spec references the CSS blending and Compositing spec for enumerating available modes.
There are trivial compositing modes in that spec that are missing here: destination and clear. Also, there are the plus-darker and plus-lighter modes

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