https://bugs.webkit.org/show_bug.cgi?id=49907

Reviewed by Dirk Schulze.

SVG filter primitives can use the output of other filters. The
input and output format of a filter can be a premultiplied or
unmultiplied RGBA array, or an image buffer. All filter
primitive results were converted to image buffers before, which
could be an unecessary (and really costly) operation, if
a filter expects its input in the same format as the output
of the input filter primitive. This overhead is removed by
this patch. All apply() methods are updated according to this
new filter primitive interface.

Filters do not generate their results twice (or more) anymore,
when their apply() called multiple times.

The existing tests cover this feature.

* manual-tests/svg-filter-animation.svg: Added.
* platform/graphics/filters/FEBlend.cpp:
(WebCore::FEBlend::apply):
* platform/graphics/filters/FEColorMatrix.cpp:
(WebCore::FEColorMatrix::apply):
* platform/graphics/filters/FEComponentTransfer.cpp:
(WebCore::FEComponentTransfer::apply):
* platform/graphics/filters/FEComposite.cpp:
(WebCore::FEComposite::apply):
* platform/graphics/filters/FEConvolveMatrix.cpp:
(WebCore::FEConvolveMatrix::apply):
* platform/graphics/filters/FEDisplacementMap.cpp:
(WebCore::FEDisplacementMap::apply):
* platform/graphics/filters/FEFlood.cpp:
(WebCore::FEFlood::apply):
* platform/graphics/filters/FEGaussianBlur.cpp:
(WebCore::FEGaussianBlur::apply):
* platform/graphics/filters/FELighting.cpp:
(WebCore::FELighting::apply):
* platform/graphics/filters/FEMerge.cpp:
(WebCore::FEMerge::apply):
* platform/graphics/filters/FEMerge.h:
* platform/graphics/filters/FEMorphology.cpp:
(WebCore::FEMorphology::apply):
* platform/graphics/filters/FEOffset.cpp:
(WebCore::FEOffset::apply):
* platform/graphics/filters/FETile.cpp:
(WebCore::FETile::apply):
* platform/graphics/filters/FETurbulence.cpp:
(WebCore::FETurbulence::apply):
* platform/graphics/filters/FilterEffect.cpp:
(WebCore::FilterEffect::requestedRegionOfInputImageData):
(WebCore::FilterEffect::asImageBuffer):
(WebCore::FilterEffect::asUnmultipliedImage):
(WebCore::FilterEffect::asPremultipliedImage):
(WebCore::FilterEffect::copyImageBytes):
(WebCore::FilterEffect::copyUnmultipliedImage):
(WebCore::FilterEffect::copyPremultipliedImage):
(WebCore::FilterEffect::createImageBufferResult):
(WebCore::FilterEffect::createUnmultipliedImageResult):
(WebCore::FilterEffect::createPremultipliedImageResult):
* platform/graphics/filters/FilterEffect.h:
(WebCore::FilterEffect::hasResult):
* platform/graphics/filters/SourceAlpha.cpp:
(WebCore::SourceAlpha::apply):
* platform/graphics/filters/SourceGraphic.cpp:
(WebCore::SourceGraphic::apply):
* platform/graphics/filters/SourceGraphic.h:
* rendering/RenderSVGResourceFilter.cpp:
(WebCore::RenderSVGResourceFilter::postApplyResource):
* svg/graphics/filters/SVGFEImage.cpp:
(WebCore::FEImage::apply):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@73894 268f45cc-cd09-0410-ab3c-d52691b4dbfc