https://bugs.webkit.org/show_bug.cgi?id=43507, stop ImageBuffer from copying its data when rendering after canvas changes happen.
        
Reviewed by Anders Carlsson.

This patch renames ImageBuffer::image() to ImageBuffer::copyImage(). The new method always returns a new copy that is a current
snapshot of the ImageBuffer.
        
To draw an ImageBuffer, you now use new GraphicsContext calls: drawImageBuffer.  Platforms can then optimize these calls to draw
efficiently without having to copy the bits of the ImageBuffer into an Image.

* WebCore.xcodeproj/project.pbxproj:
* css/CSSCanvasValue.cpp:
(WebCore::CSSCanvasValue::image):
* html/HTMLCanvasElement.cpp:
(WebCore::HTMLCanvasElement::willDraw):
(WebCore::HTMLCanvasElement::reset):
(WebCore::HTMLCanvasElement::paint):
(WebCore::HTMLCanvasElement::setSurfaceSize):
(WebCore::HTMLCanvasElement::copiedImage):
(WebCore::HTMLCanvasElement::clearCopiedImage):
* html/HTMLCanvasElement.h:
* html/canvas/CanvasPattern.cpp:
(WebCore::CanvasPattern::CanvasPattern):
* html/canvas/CanvasPattern.h:
(WebCore::CanvasPattern::create):
* html/canvas/CanvasRenderingContext2D.cpp:
(WebCore::CanvasRenderingContext2D::drawImage):
(WebCore::CanvasRenderingContext2D::createPattern):
(WebCore::CanvasRenderingContext2D::drawTextInternal):
* html/canvas/WebGLRenderingContext.cpp:
(WebCore::WebGLRenderingContext::paintRenderingResultsToCanvas):
(WebCore::WebGLRenderingContext::reshape):
(WebCore::WebGLRenderingContext::texImage2D):
(WebCore::WebGLRenderingContext::texSubImage2D):
* html/canvas/WebGLRenderingContext.h:
(WebCore::WebGLRenderingContext::paintsIntoCanvasBuffer):
* platform/graphics/GeneratedImage.cpp:
(WebCore::GeneratedImage::drawPattern):
* platform/graphics/GraphicsContext.cpp:
(WebCore::GraphicsContext::drawImageBuffer):
(WebCore::GraphicsContext::clipToImageBuffer):
* platform/graphics/GraphicsContext.h:
* platform/graphics/GraphicsContext3D.h:
(WebCore::GraphicsContext3D::paintsIntoCanvasBuffer):
* platform/graphics/Image.h:
* platform/graphics/ImageBuffer.h:
(WebCore::ImageBuffer::width):
(WebCore::ImageBuffer::height):
* platform/graphics/Pattern.cpp:
(WebCore::Pattern::Pattern):
* platform/graphics/Pattern.h:
(WebCore::Pattern::create):
* platform/graphics/cairo/GraphicsContextCairo.cpp:
* platform/graphics/cairo/ImageBufferCairo.cpp:
(WebCore::ImageBuffer::drawsUsingCopy):
(WebCore::ImageBuffer::copyImage):
(WebCore::ImageBuffer::clip):
(WebCore::ImageBuffer::draw):
(WebCore::ImageBuffer::drawPattern):
* platform/graphics/cg/GraphicsContextCG.cpp:
* platform/graphics/cg/ImageBufferCG.cpp:
(WebCore::ImageBuffer::ImageBuffer):
(WebCore::ImageBuffer::drawsUsingCopy):
(WebCore::ImageBuffer::copyImage):
(WebCore::ImageBuffer::draw):
(WebCore::ImageBuffer::drawPattern):
(WebCore::ImageBuffer::clip):
* platform/graphics/cg/ImageBufferData.h:
* platform/graphics/filters/FEColorMatrix.cpp:
(WebCore::FEColorMatrix::apply):
* platform/graphics/filters/FEComposite.cpp:
(WebCore::FEComposite::apply):
* platform/graphics/filters/SourceAlpha.cpp:
(WebCore::SourceAlpha::apply):
* platform/graphics/filters/SourceGraphic.cpp:
(WebCore::SourceGraphic::apply):
* platform/graphics/mac/GraphicsContext3DMac.mm:
* platform/graphics/qt/GraphicsContext3DQt.cpp:
* platform/graphics/qt/GraphicsContextQt.cpp:
* platform/graphics/qt/ImageBufferData.h:
* platform/graphics/qt/ImageBufferQt.cpp:
(WebCore::ImageBufferData::ImageBufferData):
(WebCore::ImageBuffer::drawsUsingCopy):
(WebCore::ImageBuffer::copyImage):
(WebCore::ImageBuffer::draw):
(WebCore::ImageBuffer::drawPattern):
(WebCore::ImageBuffer::clip):
* platform/graphics/skia/GraphicsContextSkia.cpp:
* platform/graphics/skia/ImageBufferSkia.cpp:
(WebCore::ImageBuffer::drawsUsingCopy):
(WebCore::ImageBuffer::copyImage):
(WebCore::ImageBuffer::clip):
(WebCore::):
* platform/graphics/wx/GraphicsContextWx.cpp:
* platform/graphics/wx/ImageBufferWx.cpp:
(WebCore::ImageBuffer::drawsUsingCopy):
(WebCore::ImageBuffer::copyImage):
(WebCore::ImageBuffer::clip):
(WebCore::ImageBuffer::draw):
(WebCore::ImageBuffer::drawPattern):
* platform/mac/ScrollbarThemeMac.mm:
(WebCore::ScrollbarThemeMac::paint):
* rendering/RenderBoxModelObject.cpp:
(WebCore::RenderBoxModelObject::paintFillLayerExtended):
* rendering/RenderSVGResourceClipper.cpp:
(WebCore::RenderSVGResourceClipper::applyClippingToContext):
* rendering/RenderSVGResourceFilter.cpp:
(WebCore::RenderSVGResourceFilter::postApplyResource):
* rendering/RenderSVGResourceGradient.cpp:
(WebCore::clipToTextMask):
* rendering/RenderSVGResourceMasker.cpp:
(WebCore::RenderSVGResourceMasker::applyResource):
* rendering/RenderSVGResourcePattern.cpp:
(WebCore::RenderSVGResourcePattern::buildPattern):
* rendering/RenderThemeMac.mm:
(WebCore::RenderThemeMac::paintProgressBar):
* svg/SVGFEImageElement.cpp:
(WebCore::SVGFEImageElement::build):
* svg/graphics/SVGImage.cpp:
(WebCore::SVGImage::nativeImageForCurrentFrame):
* svg/graphics/SVGImage.h:
* svg/graphics/filters/SVGFEMerge.cpp:
(WebCore::FEMerge::apply):
* svg/graphics/filters/SVGFEOffset.cpp:
(WebCore::FEOffset::apply):
* svg/graphics/filters/SVGFETile.cpp:
(WebCore::FETile::apply):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@65449 268f45cc-cd09-0410-ab3c-d52691b4dbfc