https://bugs.webkit.org/show_bug.cgi?id=116643

Source/WebCore:

Reviewed by Alexandru Chiculita.

This is a first small step towards supporting CSS shapes defined by an
image URL and a alpha channel threshold. To keep the patch as small as
possible, there are many limitations and remaining work items. For
example images are currently restricted to same-origin, although CORS
should be supported. See https://bugs.webkit.org/show_bug.cgi?id=116348
for the current list.

Test: fast/exclusions/shape-inside/shape-inside-image-001.html
Test: fast/exclusions/shape-inside/shape-inside-image-002.html

* CMakeLists.txt:
* GNUmakefile.list.am:
* Target.pri:
* WebCore.vcxproj/WebCore.vcxproj:
* WebCore.xcodeproj/project.pbxproj:
* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::imageChanged): When the image has finished loading, request a layout.
* rendering/RenderBlock.h:
* rendering/RenderObject.cpp:
(WebCore::RenderObject::setStyle): Add notify clients for shape images.
(WebCore::RenderObject::updateShapeImage):
(WebCore::removeShapeImageClient):
(WebCore::RenderObject::arenaDelete): Remove notify clients for shape images.
* rendering/RenderObject.h:
* rendering/shapes/RasterShape.cpp: Added. A Shape defined by thresholding an image's alpha channel.
(WebCore::RasterShapeIntervals::bounds):
(WebCore::RasterShapeIntervals::addInterval): Add a single run to the shape.
(WebCore::alignedRect):
(WebCore::RasterShapeIntervals::getIntervals): Return the shape's runs that fall within a horizonal box.
(WebCore::RasterShape::marginIntervals): Internal representation of the shape with shape-margin factored in.  Currently only a stub.
(WebCore::RasterShape::paddingIntervals): Internal representation of the shape with shape-padding factored in.  Currently only a stub.
(WebCore::RasterShape::getExcludedIntervals):
(WebCore::RasterShape::getIncludedIntervals):
(WebCore::RasterShape::firstIncludedIntervalLogicalTop):
* rendering/shapes/RasterShape.h:
(WebCore::RasterShapeIntervals::RasterShapeIntervals): Internal run length encoded representation of a RasterShape.
(WebCore::RasterShapeIntervals::isEmpty):
(WebCore::RasterShape::RasterShape):
* rendering/shapes/Shape.cpp:
(WebCore::Shape::createShape): Support for creating a Shape based on a RasterShapeIntervals object.
* rendering/shapes/Shape.h:
* rendering/shapes/ShapeInfo.cpp:
(WebCore::::computedShape): Added support for the Image ShapeValue type.
* rendering/shapes/ShapeInsideInfo.cpp:
(WebCore::ShapeInsideInfo::isEnabledFor): Added support for the Image ShapeValue type.
* rendering/shapes/ShapeOutsideInfo.cpp:
(WebCore::ShapeOutsideInfo::isEnabledFor): Added support for the Image ShapeValue type.
* rendering/style/ShapeValue.h:
(WebCore::ShapeValue::isImageValid): True if the shape's image is ready to be be processed.

LayoutTests:

Two tests to verify that the initial implementation of shape valued images is working
for shape-inside.

Reviewed by Alexandru Chiculita.

* fast/exclusions/shape-inside/shape-inside-image-001-expected.html: Added.
* fast/exclusions/shape-inside/shape-inside-image-001.html: Added.
* fast/exclusions/shape-inside/shape-inside-image-002-expected.html: Added.
* fast/exclusions/shape-inside/shape-inside-image-002.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154081 268f45cc-cd09-0410-ab3c-d52691b4dbfc