2008-04-22  David Hyatt  <hyatt@apple.com>

        Fix for <rdar://5589634>.

        Implement CSS alpha masks.  The syntax is very similar to that used for backgrounds.  Multiple mask images
        can be specified, and each one can be tiled, positioned, etc.  The following new properties have been
        added (all of which are analogous to their background-* counterparts).

        mask, mask-image, mask-clip, mask-origin, mask-repeat, mask-attachment, mask-position

        The alpha values in the final composite image are used to determine how the mask applies (alpha of 1 = show,
        alpha of 0 = don't show).

        SVG images and CSS gradients can also be used as masks.

        Reviewed by Dan

        Added fast/backgrounds/repeat/mask-negative-offset-repeat.html, fast/backgrounds/svg-as-mask.html

        * css/CSSMutableStyleDeclaration.cpp:
        (WebCore::CSSMutableStyleDeclaration::getPropertyValue):
        (WebCore::initShorthandMap):
        * css/CSSParser.cpp:
        (WebCore::CSSParser::parseFillProperty):
        (WebCore::CSSParser::parseTransformOrigin):
        * css/CSSStyleSelector.cpp:
        (WebCore::CSSStyleSelector::adjustRenderStyle):
        (WebCore::CSSStyleSelector::applyProperty):
        * rendering/InlineFlowBox.cpp:
        (WebCore::InlineFlowBox::paint):
        (WebCore::InlineFlowBox::paintFillLayers):
        (WebCore::InlineFlowBox::paintFillLayer):
        (WebCore::InlineFlowBox::paintBoxDecorations):
        (WebCore::InlineFlowBox::paintMask):
        * rendering/InlineFlowBox.h:
        * rendering/RenderBlock.cpp:
        (WebCore::RenderBlock::paint):
        (WebCore::RenderBlock::paintObject):
        * rendering/RenderBox.cpp:
        (WebCore::RenderBox::paintRootBoxDecorations):
        (WebCore::RenderBox::paintBoxDecorations):
        (WebCore::RenderBox::paintMask):
        (WebCore::RenderBox::paintFillLayers):
        (WebCore::RenderBox::paintFillLayer):
        (WebCore::RenderBox::paintFillLayerExtended):
        * rendering/RenderBox.h:
        * rendering/RenderFieldset.cpp:
        (WebCore::RenderFieldset::paintBoxDecorations):
        (WebCore::RenderFieldset::paintMask):
        * rendering/RenderFieldset.h:
        * rendering/RenderInline.cpp:
        (WebCore::RenderInline::requiresLayer):
        * rendering/RenderLayer.cpp:
        (WebCore::RenderLayer::isTransparent):
        (WebCore::RenderLayer::paintLayer):
        * rendering/RenderObject.cpp:
        (WebCore::RenderObject::requiresLayer):
        (WebCore::mustRepaintFillLayers):
        (WebCore::RenderObject::mustRepaintBackgroundOrBorder):
        (WebCore::RenderObject::setStyle):
        (WebCore::RenderObject::updateFillImages):
        * rendering/RenderObject.h:
        (WebCore::):
        (WebCore::RenderObject::hasMask):
        (WebCore::RenderObject::paintMask):
        (WebCore::RenderObject::paintFillExtended):
        * rendering/RenderReplaced.cpp:
        (WebCore::RenderReplaced::paint):
        * rendering/RenderStyle.cpp:
        (WebCore::FillLayer::FillLayer):
        (WebCore::StyleRareNonInheritedData::StyleRareNonInheritedData):
        * rendering/RenderStyle.h:
        (WebCore::FillLayer::initialFillComposite):
        (WebCore::FillLayer::initialFillSize):
        (WebCore::FillLayer::FillLayer):
        (WebCore::RenderStyle::hasMask):
        * rendering/RenderTable.cpp:
        (WebCore::RenderTable::paint):
        (WebCore::RenderTable::paintBoxDecorations):
        (WebCore::RenderTable::paintMask):
        * rendering/RenderTable.h:
        * rendering/RenderTableCell.cpp:
        (WebCore::RenderTableCell::requiresLayer):
        (WebCore::RenderTableCell::paintBackgroundsBehindCell):
        (WebCore::RenderTableCell::paintMask):
        * rendering/RenderTableCell.h:
        * rendering/RenderWidget.cpp:
        (WebCore::RenderWidget::paint):
        * svg/graphics/SVGImage.cpp:
        (WebCore::SVGImage::draw):
        (WebCore::SVGImage::dataChanged):

LayoutTests:

2008-04-22  David Hyatt  <hyatt@apple.com>

        Add support for CSS alpha masks.  Test cases.

        Reviewed by Dan

        * fast/backgrounds/repeat/mask-negative-offset-repeat.html: Added.
        * fast/backgrounds/repeat/resources/white.gif: Added.
        * fast/backgrounds/svg-as-mask.html: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@32406 268f45cc-cd09-0410-ab3c-d52691b4dbfc