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/*
* 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 "GraphicsContext3D.h"
#include "GraphicsLayer.h"
#include "IntSize.h"
#include <wtf/Noncopyable.h>
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
#if PLATFORM(MAC)
#include <wtf/RetainPtr.h>
#endif
namespace WebCore {
#if PLATFORM(CHROMIUM)
struct DrawingBufferInternal;
#endif
// Manages a rendering target (framebuffer + attachment) for a canvas. Can publish its rendering
// results to a PlatformLayer for compositing.
class DrawingBuffer : public RefCounted<DrawingBuffer> {
public:
friend class GraphicsContext3D;
~DrawingBuffer();
void reset(const IntSize&);
void bind();
IntSize size() const { return m_size; }
// Clear all resources from this object, as well as context. Called when context is destroyed
// to prevent invalid accesses to the resources.
void clear();
// 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);
bool multisample() const { return m_context && m_context->getContextAttributes().antialias && m_multisampleExtensionSupported; }
Platform3DObject platformColorBuffer() const;
#if USE(ACCELERATED_COMPOSITING)
PlatformLayer* platformLayer();
void publishToPlatformLayer();
#endif
#if PLATFORM(CHROMIUM)
class WillPublishCallback : public Noncopyable {
public:
virtual ~WillPublishCallback() { }
virtual void willPublish() = 0;
};
void setWillPublishCallback(PassOwnPtr<WillPublishCallback> callback) { m_callback = callback; }
#endif
PassRefPtr<GraphicsContext3D> graphicsContext3D() const { return m_context; }
private:
static PassRefPtr<DrawingBuffer> create(GraphicsContext3D*, const IntSize&);
DrawingBuffer(GraphicsContext3D*, const IntSize&);
// Platform specific function called after reset() so each platform can do extra work if needed
void didReset();
RefPtr<GraphicsContext3D> m_context;
IntSize m_size;
bool m_multisampleExtensionSupported;
Platform3DObject m_fbo;
Platform3DObject m_colorBuffer;
Platform3DObject m_depthStencilBuffer;
// For multisampling
Platform3DObject m_multisampleFBO;
Platform3DObject m_multisampleColorBuffer;
Platform3DObject m_multisampleDepthStencilBuffer;
#if PLATFORM(CHROMIUM)
OwnPtr<WillPublishCallback> m_callback;
OwnPtr<DrawingBufferInternal> m_internal;
#endif
#if PLATFORM(MAC)
RetainPtr<WebGLLayer> m_platformLayer;
#endif
};
} // namespace WebCore
#endif // DrawingBuffer_h
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