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[Qt] Fix issues when using the WebView as ShaderEffectSource
https://bugs.webkit.org/show_bug.cgi?id=83587 Reviewed by Noam Rosenthal. Source/WebCore: - Make sure that the bound frame buffer is preserved instead of binding to the default one - Accept a "mirrored" flag in beginPainting that we're applying on the projection matrix just as with internal FBOs The "flip" logic in createProjectionMatrix has been reversed and renamed to mirrored so that FBO rendering is considered the special case and not the other way around just like within Qt. * platform/graphics/texmap/TextureMapper.h: (WebCore::TextureMapper::beginPainting): * platform/graphics/texmap/TextureMapperGL.cpp: (WebCore::TextureMapperGLData::TextureMapperGLData): (TextureMapperGLData): (WebCore::TextureMapperGL::beginPainting): (WebCore::createProjectionMatrix): (WebCore::BitmapTextureGL::bind): (WebCore::TextureMapperGL::bindSurface): * platform/graphics/texmap/TextureMapperGL.h: Source/WebKit2: Qt is going to mirror the projection matrix when the shader effect source is grabbed. Detect that the matrix is mirrored and pass on this information to TextureMapper so that it can do the same. * UIProcess/WebLayerTreeRenderer.cpp: (WebKit::WebLayerTreeRenderer::paintToCurrentGLContext): * UIProcess/WebLayerTreeRenderer.h: (WebLayerTreeRenderer): * UIProcess/qt/QtWebPageSGNode.cpp: (WebKit::ContentsSGNode::render): Canonical link: https://commits.webkit.org/101157@main git-svn-id: https://svn.webkit.org/repository/webkit/trunk@113859 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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