Revert "[offscreenCanvas] Take WebGL's rendered textures directly to the compositor instead of copying."

This reverts commit 871c426.

Author: pgorszkowski-igalia

Source/WebCore/html/OffscreenCanvas.cpp

@@ -209,7 +209,6 @@ void OffscreenCanvas::createContextWebGL(RenderingContextType contextType, WebGL
     UNUSED_PARAM(contextType);
 #endif
     m_context = WebGLRenderingContextBase::create(*this, attrs, webGLVersion);
-    m_placeholderData->bufferPipeSource->setGraphicsContextGL(static_cast<WebGLRenderingContextBase*>(m_context.get())->graphicsContextGL());
 }
 
 #endif // ENABLE(WEBGL)
@@ -449,10 +448,8 @@ void OffscreenCanvas::commitToPlaceholderCanvas()
 
     // FIXME: Transfer texture over if we're using accelerated compositing
     if (m_context && (m_context->isWebGL() || m_context->isAccelerated())) {
-        m_context->prepareForDisplayWithSwapBuffers();
-        m_placeholderData->bufferPipeSource->swapBuffers();
+        m_context->prepareForDisplayWithPaint();
         m_context->paintRenderingResultsToCanvas();
-        return;
     }
 
     if (m_placeholderData->bufferPipeSource) {

Source/WebCore/html/canvas/CanvasRenderingContext.h

@@ -76,7 +76,6 @@ class CanvasRenderingContext : public ScriptWrappable, public CanMakeWeakPtr<Can
     // Called before paintRenderingResultsToCanvas if paintRenderingResultsToCanvas is
     // used for compositing purposes.
     virtual void prepareForDisplayWithPaint() { }
-    virtual void prepareForDisplayWithSwapBuffers() { }
     virtual void paintRenderingResultsToCanvas() { }
     virtual RefPtr<GraphicsLayerContentsDisplayDelegate> layerContentsDisplayDelegate();
 

Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp

@@ -1455,22 +1455,11 @@ void WebGLRenderingContextBase::prepareForDisplayWithPaint()
     m_isDisplayingWithPaint = true;
 }
 
-void WebGLRenderingContextBase::prepareForDisplayWithSwapBuffers()
-{
-    m_isDisplayingWithSwapBuffers = true;
-}
-
 void WebGLRenderingContextBase::paintRenderingResultsToCanvas()
 {
     if (isContextLostOrPending())
         return;
 
-    if (m_isDisplayingWithSwapBuffers) {
-        m_isDisplayingWithSwapBuffers = false;
-        m_markedCanvasDirty = false;
-        return;
-    }
-
     if (m_isDisplayingWithPaint) {
         bool canvasContainsDisplayBuffer = !m_markedCanvasDirty;
         prepareForDisplay();

Source/WebCore/html/canvas/WebGLRenderingContextBase.h

@@ -424,7 +424,6 @@ class WebGLRenderingContextBase : public GraphicsContextGL::Client, public GPUBa
     void reshape(int width, int height) override;
 
     void prepareForDisplayWithPaint() final;
-    void prepareForDisplayWithSwapBuffers() final;
     void paintRenderingResultsToCanvas() final;
     RefPtr<PixelBuffer> paintRenderingResultsToPixelBuffer();
 #if ENABLE(MEDIA_STREAM)
@@ -748,7 +747,6 @@ class WebGLRenderingContextBase : public GraphicsContextGL::Client, public GPUBa
 
     bool m_compositingResultsNeedUpdating { false };
     bool m_isDisplayingWithPaint { false };
-    bool m_isDisplayingWithSwapBuffers { false };
 
     // Enabled extension objects.
     // FIXME: Move some of these to WebGLRenderingContext, the ones not needed for WebGL2

Source/WebCore/platform/graphics/ImageBufferPipe.h

@@ -34,7 +34,6 @@
 namespace WebCore {
 
 class ImageBuffer;
-class GraphicsContextGL;
 
 // Used to provide GraphicsLayer contents for an externally managed ImageBuffer; e.g. an ImageBuffer created and owned by a Worker thread
 class ImageBufferPipe : public RefCounted<ImageBufferPipe> {
@@ -44,8 +43,6 @@ class ImageBufferPipe : public RefCounted<ImageBufferPipe> {
         virtual ~Source() = default;
 
         virtual void handle(RefPtr<ImageBuffer>&&) = 0;
-        virtual void swapBuffers() = 0;
-        virtual void setGraphicsContextGL(GraphicsContextGL*) = 0;
     };
 
     static RefPtr<ImageBufferPipe> create();

Source/WebCore/platform/graphics/nicosia/NicosiaImageBufferPipe.cpp

@@ -104,36 +104,6 @@ void NicosiaImageBufferPipeSource::handle(RefPtr<ImageBuffer>&& buffer)
     m_imageBuffer = WTFMove(buffer);
 }
 
-void NicosiaImageBufferPipeSource::swapBuffers()
-{
-    if (!m_context)
-        return;
-
-    if (m_context->layerComposited())
-        return;
-
-    m_context->prepareTexture();
-    IntSize textureSize(m_context->m_currentWidth, m_context->m_currentHeight);
-
-    TextureMapperGL::Flags flags = TextureMapperGL::ShouldFlipTexture;
-    if (m_context->contextAttributes().alpha)
-        flags |= TextureMapperGL::ShouldBlend;
-
-    {
-        auto& proxy = downcast<Nicosia::ContentLayerTextureMapperImpl>(m_nicosiaLayer->impl()).proxy();
-        Locker locker { proxy.lock() };
-        ASSERT(is<TextureMapperPlatformLayerProxyGL>(proxy));
-        downcast<TextureMapperPlatformLayerProxyGL>(proxy).pushNextBuffer(makeUnique<TextureMapperPlatformLayerBuffer>(m_context->m_compositorTexture, textureSize, flags, m_context->m_internalColorFormat));
-    }
-
-    m_context->markLayerComposited();
-}
-
-void NicosiaImageBufferPipeSource::setGraphicsContextGL(GraphicsContextGL* context)
-{
-    m_context = static_cast<GraphicsContextGLOpenGL*>(context);
-}
-
 void NicosiaImageBufferPipeSource::swapBuffersIfNeeded()
 {
 }

Source/WebCore/platform/graphics/nicosia/NicosiaImageBufferPipe.h

@@ -26,7 +26,6 @@
 
 #pragma once
 
-#include "GraphicsContextGLOpenGL.h"
 #include "ImageBufferPipe.h"
 #include "NicosiaContentLayerTextureMapperImpl.h"
 
@@ -57,8 +56,6 @@ class NicosiaImageBufferPipeSource : public WebCore::ImageBufferPipe::Source, pu
 
     // ImageBufferPipe::Source overrides.
     void handle(RefPtr<WebCore::ImageBuffer>&&) final;
-    void swapBuffers() final;
-    void setGraphicsContextGL(WebCore::GraphicsContextGL*) final;
 
     // ContentLayerTextureMapperImpl::Client overrides.
     void swapBuffersIfNeeded() override;
@@ -69,7 +66,6 @@ class NicosiaImageBufferPipeSource : public WebCore::ImageBufferPipe::Source, pu
 
     mutable Lock m_imageBufferLock;
     RefPtr<WebCore::ImageBuffer> m_imageBuffer;
-    WebCore::GraphicsContextGLOpenGL* m_context;
 };
 
 class NicosiaImageBufferPipe final : public WebCore::ImageBufferPipe {

Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGL.h

@@ -39,7 +39,6 @@
 #if USE(NICOSIA)
 namespace Nicosia {
 class GCGLLayer;
-class NicosiaImageBufferPipeSource;
 }
 #endif
 
@@ -575,7 +574,6 @@ class WEBCORE_EXPORT GraphicsContextGLOpenGL : public GraphicsContextGL
 
 #if USE(NICOSIA)
     friend class Nicosia::GCGLLayer;
-    friend class Nicosia::NicosiaImageBufferPipeSource;
     std::unique_ptr<Nicosia::GCGLLayer> m_nicosiaLayer;
 #elif USE(TEXTURE_MAPPER)
     friend class TextureMapperGCGLPlatformLayer;