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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 LayerRendererChromium_h
#define LayerRendererChromium_h
#if USE(ACCELERATED_COMPOSITING)
#include "CanvasLayerChromium.h"
#include "ContentLayerChromium.h"
#include "IntRect.h"
#include "LayerChromium.h"
#include "SkBitmap.h"
#include <wtf/HashMap.h>
#include <wtf/Noncopyable.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/Vector.h>
#if PLATFORM(CG)
#include <CoreGraphics/CGContext.h>
#include <wtf/RetainPtr.h>
#endif
namespace WebCore {
class GraphicsContext3D;
// Class that handles drawing of composited render layers using GL.
class LayerRendererChromium : public Noncopyable {
public:
static PassOwnPtr<LayerRendererChromium> create(PassOwnPtr<GraphicsContext3D> graphicsContext3D);
LayerRendererChromium(PassOwnPtr<GraphicsContext3D> graphicsContext3D);
~LayerRendererChromium();
GraphicsContext3D* context();
// updates size of root texture, if needed, and scrolls the backbuffer.
void prepareToDrawLayers(const IntRect& visibleRect, const IntRect& contentRect, const IntPoint& scrollPosition);
// updates a rectangle within the root layer texture
void updateRootLayerTextureRect(const IntRect& updateRect);
// draws the current layers onto the backbuffer
void drawLayers(const IntRect& visibleRect, const IntRect& contentRect);
// waits for rendering to finish
void finish();
// puts backbuffer onscreen
void present();
void setRootLayer(PassRefPtr<LayerChromium> layer) { m_rootLayer = layer; }
LayerChromium* rootLayer() { return m_rootLayer.get(); }
void setNeedsDisplay() { m_needsDisplay = true; }
bool hardwareCompositing() const { return m_hardwareCompositing; }
void setRootLayerCanvasSize(const IntSize&);
GraphicsContext* rootLayerGraphicsContext() const { return m_rootLayerGraphicsContext.get(); }
unsigned createLayerTexture();
static void debugGLCall(GraphicsContext3D*, const char* command, const char* file, int line);
const TransformationMatrix& projectionMatrix() const { return m_projectionMatrix; }
void useShader(unsigned);
bool checkTextureSize(const IntSize&);
const LayerChromium::SharedValues* layerSharedValues() const { return m_layerSharedValues.get(); }
const ContentLayerChromium::SharedValues* contentLayerSharedValues() const { return m_contentLayerSharedValues.get(); }
const CanvasLayerChromium::SharedValues* canvasLayerSharedValues() const { return m_canvasLayerSharedValues.get(); }
void resizeOnscreenContent(const IntSize&);
IntSize rootLayerTextureSize() const { return IntSize(m_rootLayerTextureWidth, m_rootLayerTextureHeight); }
void getFramebufferPixels(void *pixels, const IntRect& rect);
private:
void updateLayersRecursive(LayerChromium* layer, const TransformationMatrix& parentMatrix, float opacity);
void drawLayersRecursive(LayerChromium*, const FloatRect& scissorRect);
void drawLayer(LayerChromium*);
bool isLayerVisible(LayerChromium*, const TransformationMatrix&, const IntRect& visibleRect);
void drawLayerIntoStencilBuffer(LayerChromium*, bool decrement);
void scissorToRect(const FloatRect&);
bool makeContextCurrent();
bool initializeSharedObjects();
void cleanupSharedObjects();
unsigned m_rootLayerTextureId;
int m_rootLayerTextureWidth;
int m_rootLayerTextureHeight;
// Scroll shader uniform locations.
unsigned m_scrollShaderProgram;
int m_scrollShaderSamplerLocation;
int m_scrollShaderMatrixLocation;
TransformationMatrix m_projectionMatrix;
RefPtr<LayerChromium> m_rootLayer;
bool m_needsDisplay;
IntPoint m_scrollPosition;
bool m_hardwareCompositing;
unsigned int m_currentShader;
#if PLATFORM(SKIA)
OwnPtr<skia::PlatformCanvas> m_rootLayerCanvas;
OwnPtr<PlatformContextSkia> m_rootLayerSkiaContext;
OwnPtr<GraphicsContext> m_rootLayerGraphicsContext;
#elif PLATFORM(CG)
Vector<uint8_t> m_rootLayerBackingStore;
RetainPtr<CGContextRef> m_rootLayerCGContext;
OwnPtr<GraphicsContext> m_rootLayerGraphicsContext;
#endif
IntSize m_rootLayerCanvasSize;
IntRect m_rootVisibleRect;
int m_maxTextureSize;
int m_numStencilBits;
// Store values that are shared between instances of each layer type
// associated with this instance of the compositor. Since there can be
// multiple instances of the compositor running in the same renderer process
// we cannot store these values in static variables.
OwnPtr<LayerChromium::SharedValues> m_layerSharedValues;
OwnPtr<ContentLayerChromium::SharedValues> m_contentLayerSharedValues;
OwnPtr<CanvasLayerChromium::SharedValues> m_canvasLayerSharedValues;
OwnPtr<GraphicsContext3D> m_context;
};
// Setting DEBUG_GL_CALLS to 1 will call glGetError() after almost every GL
// call made by the compositor. Useful for debugging rendering issues but
// will significantly degrade performance.
#define DEBUG_GL_CALLS 0
#if DEBUG_GL_CALLS && !defined ( NDEBUG )
#define GLC(context, x) { (x), LayerRendererChromium::debugGLCall(context, #x, __FILE__, __LINE__); }
#else
#define GLC(context, x) (x)
#endif
}
#endif // USE(ACCELERATED_COMPOSITING)
#endif
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