https://bugs.webkit.org/show_bug.cgi?id=97011

Reviewed by Andreas Kling.

Source/WebCore:

The CSS Masking specification defines the presentation attribute 'mask-type' to
switch between luminance and alpha masking. 'mask-type' just affects the SVG
mask element. The luminance masking is the current behavior of of SVG masking.
Alpha masking is simular to '-webkit-mask-image'.

This patch implements this property and make it possible to switch between both
masking modes. Since the default value is 'luminance', this does not break
exisiting content which is tested with exisiting tests.

http://dvcs.w3.org/hg/FXTF/raw-file/tip/masking/index.html#the-mask-type

Tests: svg/css/mask-type.html
       svg/masking/mask-type-alpha-expected.svg
       svg/masking/mask-type-alpha.svg
       svg/masking/mask-type-luminance-expected.svg
       svg/masking/mask-type-luminance.svg
       svg/masking/mask-type-not-set-expected.svg
       svg/masking/mask-type-not-set.svg

* css/CSSComputedStyleDeclaration.cpp: Add mask-type property.
(WebCore):
(WebCore::CSSComputedStyleDeclaration::getPropertyCSSValue):
* css/CSSPrimitiveValueMappings.h:
(WebCore::CSSPrimitiveValue::CSSPrimitiveValue):
(WebCore):
(WebCore::CSSPrimitiveValue::operator EMaskType):
* css/CSSProperty.cpp:
(WebCore::CSSProperty::isInheritedProperty):
* css/SVGCSSComputedStyleDeclaration.cpp:
(WebCore::CSSComputedStyleDeclaration::getSVGPropertyCSSValue):
* css/SVGCSSParser.cpp:
(WebCore::CSSParser::parseSVGValue):
* css/SVGCSSPropertyNames.in: Add mask-type.
* css/SVGCSSStyleSelector.cpp:
(WebCore::StyleResolver::applySVGProperty):
* css/SVGCSSValueKeywords.in:
* rendering/style/SVGRenderStyle.cpp:
(WebCore::SVGRenderStyle::diff):
* rendering/style/SVGRenderStyle.h:
(WebCore::SVGRenderStyle::initialMaskType):
(WebCore::SVGRenderStyle::setMaskType):
(SVGRenderStyle):
(WebCore::SVGRenderStyle::maskType):
(WebCore::SVGRenderStyle::setBitDefaults):
* rendering/style/SVGRenderStyleDefs.h:
* rendering/svg/RenderSVGResourceMasker.cpp:

    Switch between the two masking modes according to the
    computed value of mask-type.

(WebCore::RenderSVGResourceMasker::drawContentIntoMaskImage):
* svg/SVGStyledElement.cpp:
(WebCore::SVGStyledElement::cssPropertyIdForSVGAttributeName):
(WebCore::cssPropertyToTypeMap):
* svg/svgattrs.in: Add the new attribute to the attribute list.

LayoutTests:

Added new tests for switching the masking mode on <mask> element with 'mask-type'.

* svg/css/mask-type-expected.txt: Added.
* svg/css/mask-type.html: Added.
* svg/masking/mask-type-alpha-expected.svg: Added.
* svg/masking/mask-type-alpha.svg: Added.
* svg/masking/mask-type-luminance-expected.svg: Added.
* svg/masking/mask-type-luminance.svg: Added.
* svg/masking/mask-type-not-set-expected.svg: Added.
* svg/masking/mask-type-not-set.svg: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@129018 268f45cc-cd09-0410-ab3c-d52691b4dbfc