2009-03-17 Simon Fraser <simon.fraser@apple.com>

2009-03-17  Simon Fraser  <simon.fraser@apple.com>

        Reviewed by Darin Adler

        https://bugs.webkit.org/show_bug.cgi?id=24396

        * config.h:
        Add WTF_USE_ACCELERATED_COMPOSITING, defined to 0 for now, and add some
        comments to make the #ifdefs more readable.

        * css/CSSComputedStyleDeclaration.cpp:
        (WebCore::computedTransform):
        Add a comment to mention that we don't flatten the matrix.

        * css/MediaQueryEvaluator.cpp:
        (WebCore::transform_3dMediaFeatureEval):
        Have the 'transform-3d' media query evaluate to 'true' if 3d-rendering
        is supported.

        * platform/graphics/mac/GraphicsLayerCA.mm:
        (WebCore::GraphicsLayerCA::animateTransform):
        No need for the #ifdef here. If we don't support 3d, we will have already flattened
        the matrix.

        * platform/graphics/transforms/TransformationMatrix.cpp:
        (WebCore::TransformationMatrix::makeAffine):
        * platform/graphics/transforms/TransformationMatrix.h:
        New method to convert the matrix to an affine matrix by throwing a way the non-affine
        parts.

        * rendering/RenderLayer.cpp:
        (WebCore::RenderLayer::updateTransform):
        (WebCore::RenderLayer::currentTransform):
        * rendering/RenderLayerBacking.cpp:
        (WebCore::RenderLayerBacking::updateLayerTransform):
        If 3d rendering is not supported, convert the matrix to an affine matrix
        which can be rendered, and used for hit testing.

        * rendering/RenderLayerCompositor.cpp:
        Change the name of the exported symbol that webkitdirs.pm uses to know if
        3d rendering is supported. There is no other 3d-rendering-specific symbol we can sniff.

        * rendering/RenderObject.cpp:
        (WebCore::RenderObject::transformFromContainer):
        Only take perspective into account if 3d rendering is supported.

        * rendering/RenderObject.h:
        (WebCore::makeMatrixRenderable):
        Utility method that flattens a matrix if 3d rendering is not supported.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@41780 268f45cc-cd09-0410-ab3c-d52691b4dbfc