Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/graphics/gpu/DrawingBuffer.h

Index: Source/core/platform/graphics/gpu/DrawingBuffer.h
diff --git a/Source/core/platform/graphics/gpu/DrawingBuffer.h b/Source/core/platform/graphics/gpu/DrawingBuffer.h
deleted file mode 100644
index 2516e28518007ca3f8a2b98b015ac496e690bfee..0000000000000000000000000000000000000000
--- a/Source/core/platform/graphics/gpu/DrawingBuffer.h
+++ /dev/null
@@ -1,218 +0,0 @@
-/*
- * Copyright (c) 2010, Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef DrawingBuffer_h
-#define DrawingBuffer_h
-
-#include "core/platform/graphics/GraphicsContext3D.h"
-#include "platform/geometry/IntSize.h"
-#include "platform/graphics/GraphicsTypes3D.h"
-
-#include "public/platform/WebExternalTextureLayerClient.h"
-#include "public/platform/WebExternalTextureMailbox.h"
-#include "wtf/Noncopyable.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/PassOwnPtr.h"
-
-namespace blink {
-class WebExternalBitmap;
-class WebExternalTextureLayer;
-class WebGraphicsContext3D;
-class WebLayer;
-}
-
-namespace WebCore {
-class GraphicsContext3D;
-class ImageData;
-
-// Abstract interface to allow basic context eviction management
-class ContextEvictionManager : public RefCounted<ContextEvictionManager> {
-public:
-    virtual ~ContextEvictionManager() {};
-
-    virtual void forciblyLoseOldestContext(const String& reason) = 0;
-    virtual IntSize oldestContextSize() = 0;
-};
-
-// Manages a rendering target (framebuffer + attachment) for a canvas.  Can publish its rendering
-// results to a blink::WebLayer for compositing.
-class DrawingBuffer : public RefCounted<DrawingBuffer>, public blink::WebExternalTextureLayerClient  {
-    struct MailboxInfo : public RefCounted<MailboxInfo> {
-        blink::WebExternalTextureMailbox mailbox;
-        unsigned textureId;
-        IntSize size;
-    };
-public:
-    enum PreserveDrawingBuffer {
-        Preserve,
-        Discard
-    };
-
-    static PassRefPtr<DrawingBuffer> create(GraphicsContext3D*, const IntSize&, PreserveDrawingBuffer, PassRefPtr<ContextEvictionManager>);
-
-    ~DrawingBuffer();
-
-    // Clear all resources from this object, as well as context. Called when context is destroyed
-    // to prevent invalid accesses to the resources.
-    void releaseResources();
-
-    // Issues a glClear() on all framebuffers associated with this DrawingBuffer. The caller is responsible for
-    // making the context current and setting the clear values and masks. Modifies the framebuffer binding.
-    void clearFramebuffers(GC3Dbitfield clearMask);
-
-    // Given the desired buffer size, provides the largest dimensions that will fit in the pixel budget.
-    IntSize adjustSize(const IntSize&);
-    void reset(const IntSize&);
-    void bind();
-    IntSize size() const { return m_size; }
-    bool isZeroSized() const { return m_size.isEmpty(); }
-
-    // Copies the multisample color buffer to the normal color buffer and leaves m_fbo bound.
-    void commit(long x = 0, long y = 0, long width = -1, long height = -1);
-
-    // commit should copy the full multisample buffer, and not respect the
-    // current scissor bounds. Track the state of the scissor test so that it
-    // can be disabled during calls to commit.
-    void setScissorEnabled(bool scissorEnabled) { m_scissorEnabled = scissorEnabled; }
-
-    // The DrawingBuffer needs to track the texture bound to texture unit 0.
-    // The bound texture is tracked to avoid costly queries during rendering.
-    void setTexture2DBinding(Platform3DObject texture) { m_texture2DBinding = texture; }
-
-    // The DrawingBuffer needs to track the currently bound framebuffer so it
-    // restore the binding when needed.
-    void setFramebufferBinding(Platform3DObject fbo) { m_framebufferBinding = fbo; }
-
-    // Track the currently active texture unit. Texture unit 0 is used as host for a scratch
-    // texture.
-    void setActiveTextureUnit(GC3Dint textureUnit) { m_activeTextureUnit = textureUnit; }
-
-    bool multisample() const;
-
-    Platform3DObject framebuffer() const;
-
-    void markContentsChanged();
-
-    blink::WebLayer* platformLayer();
-    void paintCompositedResultsToCanvas(ImageBuffer*);
-
-    // WebExternalTextureLayerClient implementation.
-    virtual blink::WebGraphicsContext3D* context() OVERRIDE;
-    virtual bool prepareMailbox(blink::WebExternalTextureMailbox*, blink::WebExternalBitmap*) OVERRIDE;
-    virtual void mailboxReleased(const blink::WebExternalTextureMailbox&) OVERRIDE;
-
-    bool copyToPlatformTexture(GraphicsContext3D&, Platform3DObject texture, GC3Denum internalFormat,
-        GC3Denum destType, GC3Dint level, bool premultiplyAlpha, bool flipY);
-
-private:
-    DrawingBuffer(GraphicsContext3D*, const IntSize&, bool multisampleExtensionSupported,
-                  bool packedDepthStencilExtensionSupported, PreserveDrawingBuffer, PassRefPtr<ContextEvictionManager>);
-
-    void initialize(const IntSize&);
-
-    Platform3DObject frontColorBuffer() const;
-    Platform3DObject colorBuffer() const { return m_colorBuffer; }
-
-    unsigned createColorTexture(const IntSize& size = IntSize());
-    // Create the depth/stencil and multisample buffers, if needed.
-    void createSecondaryBuffers();
-    bool resizeFramebuffer(const IntSize&);
-    bool resizeMultisampleFramebuffer(const IntSize&);
-    void resizeDepthStencil(const IntSize&, int sampleCount);
-
-    // Bind to the m_framebufferBinding if it's not 0.
-    void restoreFramebufferBinding();
-
-    void clearPlatformLayer();
-
-    PassRefPtr<MailboxInfo> recycledMailbox();
-    PassRefPtr<MailboxInfo> createNewMailbox(unsigned);
-
-    // Updates the current size of the buffer, ensuring that s_currentResourceUsePixels is updated.
-    void setSize(const IntSize& size);
-
-    // Calculates the difference in pixels between the current buffer size and the proposed size.
-    int pixelDelta(const IntSize& size);
-
-    // Given the desired buffer size, provides the largest dimensions that will fit in the pixel budget
-    // Returns true if the buffer will only fit if the oldest WebGL context is forcibly lost
-    IntSize adjustSizeWithContextEviction(const IntSize&, bool& evictContext);
-
-    PreserveDrawingBuffer m_preserveDrawingBuffer;
-    bool m_scissorEnabled;
-    Platform3DObject m_texture2DBinding;
-    Platform3DObject m_framebufferBinding;
-    GC3Denum m_activeTextureUnit;
-
-    RefPtr<GraphicsContext3D> m_context;
-    IntSize m_size;
-    bool m_multisampleExtensionSupported;
-    bool m_packedDepthStencilExtensionSupported;
-    Platform3DObject m_fbo;
-    Platform3DObject m_colorBuffer;
-    Platform3DObject m_frontColorBuffer;
-
-    // This is used when we have OES_packed_depth_stencil.
-    Platform3DObject m_depthStencilBuffer;
-
-    // These are used when we don't.
-    Platform3DObject m_depthBuffer;
-    Platform3DObject m_stencilBuffer;
-
-    // For multisampling.
-    Platform3DObject m_multisampleFBO;
-    Platform3DObject m_multisampleColorBuffer;
-
-    // True if our contents have been modified since the last presentation of this buffer.
-    bool m_contentsChanged;
-
-    // True if commit() has been called since the last time markContentsChanged() had been called.
-    bool m_contentsChangeCommitted;
-
-    GraphicsContext3D::Attributes m_attributes;
-    unsigned m_internalColorFormat;
-    unsigned m_colorFormat;
-    unsigned m_internalRenderbufferFormat;
-    int m_maxTextureSize;
-
-    OwnPtr<blink::WebExternalTextureLayer> m_layer;
-
-    // All of the mailboxes that this DrawingBuffer has ever created.
-    Vector<RefPtr<MailboxInfo> > m_textureMailboxes;
-    // Mailboxes that were released by the compositor and can be used again by this DrawingBuffer.
-    Vector<RefPtr<MailboxInfo> > m_recycledMailboxes;
-    RefPtr<MailboxInfo> m_lastColorBuffer;
-
-    RefPtr<ContextEvictionManager> m_contextEvictionManager;
-};
-
-} // namespace WebCore
-
-#endif // DrawingBuffer_h