https://bugs.webkit.org/show_bug.cgi?id=90101

Patch by Max Vujovic <mvujovic@adobe.com> on 2012-08-06
Reviewed by Dirk Schulze.

Source/WebCore:

Parse the mix function syntax for CSS Shaders as defined in the Filter Effects spec:
https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#FilterFunction

The fragment shader argument of the custom filter function can now be a mix function with
the following syntax:
mix(<uri> [ <blend-mode> || <alpha-compositing> ]?)

For example:
-webkit-filter: custom(url(shader.vert) mix(url(shader.frag multiply source-over))

The Filter Effects spec references the Compositing and Blending spec, which defines the
supported blend modes and alpha compositing modes.

Blend modes:
https://dvcs.w3.org/hg/FXTF/rawfile/tip/compositing/index.html#blend-mode

This patch adds all of the blend modes in the spec.

Alpha compositing modes:
https://dvcs.w3.org/hg/FXTF/rawfile/tip/compositing/index.html#alpha-compositing

This patch does not add any new CSS values for alpha compositing. Currently, we parse the
values that are the same between the spec and the -webkit-background-composite property,
including:
    clear
    copy
    source-over
    source-in
    source-out
    source-atop
    destination-over
    destination-in
    destination-out
    destination-atop
    xor

In the future, we may need to add the following CSS values for alpha compositing:
    lighter
    destination

This is currently under discussion on the www-style mailing list:
http://lists.w3.org/Archives/Public/www-style/2012Aug/0123.html

No new test files. Add test cases in:
    css3/filters/script-tests/custom-filter-property-computed-style.js:
    css3/filters/script-tests/custom-filter-property-parsing-invalid.js:
    css3/filters/script-tests/custom-filter-property-parsing.js:

* GNUmakefile.list.am:
* Target.pri:
* WebCore.gypi:
* WebCore.vcproj/WebCore.vcproj:
* WebCore.xcodeproj/project.pbxproj:
* css/CSSComputedStyleDeclaration.cpp:
(WebCore::CSSComputedStyleDeclaration::valueForFilter):
* css/CSSParser.cpp:
(WebCore::CSSParser::isBlendMode):
(WebCore):
(WebCore::CSSParser::isCompositeOperator):
(WebCore::CSSParser::parseMixFunction):
(WebCore::CSSParser::parseCustomFilter):
* css/CSSParser.h:
(WebCore):
* css/CSSParserValues.h:
(WebCore::CSSParserValueList::currentIndex):
* css/CSSPrimitiveValueMappings.h:
(WebCore::CSSPrimitiveValue::CSSPrimitiveValue):
(WebCore):
(WebCore::CSSPrimitiveValue::operator BlendMode):
* css/CSSValue.cpp:
(WebCore::CSSValue::reportMemoryUsage):
(WebCore::CSSValue::cssText):
(WebCore::CSSValue::destroy):
(WebCore::CSSValue::cloneForCSSOM):
* css/CSSValue.h:
(WebCore::CSSValue::isWebKitCSSMixFunctionValue):
(CSSValue):
* css/CSSValueKeywords.in:
* css/StyleResolver.cpp:
(WebCore::StyleResolver::collectMatchingRulesForList):
* css/WebKitCSSMixFunctionValue.cpp: Added.
(WebCore):
(WebCore::WebKitCSSMixFunctionValue::WebKitCSSMixFunctionValue):
(WebCore::WebKitCSSMixFunctionValue::customCssText):
(WebCore::WebKitCSSMixFunctionValue::cloneForCSSOM):
(WebCore::WebKitCSSMixFunctionValue::reportDescendantMemoryUsage):
* css/WebKitCSSMixFunctionValue.h: Added.
(WebCore):
(WebKitCSSMixFunctionValue):
(WebCore::WebKitCSSMixFunctionValue::create):
* platform/graphics/GraphicsTypes.h:
* platform/graphics/filters/CustomFilterProgram.cpp:
(WebCore::CustomFilterProgram::CustomFilterProgram):
* platform/graphics/filters/CustomFilterProgram.h:
(WebCore::CustomFilterProgramMixSettings::CustomFilterProgramMixSettings):
(CustomFilterProgramMixSettings):
(WebCore):
* rendering/style/StyleCustomFilterProgram.h:
(WebCore::StyleCustomFilterProgram::create):
(WebCore::StyleCustomFilterProgram::StyleCustomFilterProgram):

LayoutTests:

Add tests for custom filter mix function parsing as defined in the Filter Effects spec:
https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#FilterFunction

Remove some mac-wk2 and chromium expectations because they are the same as the general
expectations.

* css3/filters/custom/custom-filter-property-computed-style-expected.txt:
* css3/filters/custom/custom-filter-property-parsing-expected.txt:
* css3/filters/custom/custom-filter-property-parsing-invalid-expected.txt:
* css3/filters/script-tests/custom-filter-property-computed-style.js:
* css3/filters/script-tests/custom-filter-property-parsing-invalid.js:
* css3/filters/script-tests/custom-filter-property-parsing.js:
* platform/chromium/css3/filters/custom/custom-filter-property-computed-style-expected.txt:
* platform/chromium/css3/filters/custom/custom-filter-property-parsing-expected.txt:
* platform/chromium/css3/filters/custom/custom-filter-property-parsing-invalid-expected.txt: Removed.
* platform/mac-wk2/css3/filters/custom/custom-filter-property-computed-style-expected.txt: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@124820 268f45cc-cd09-0410-ab3c-d52691b4dbfc