gecko-dev/gfx/layers/CopyableCanvasLayer.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GFX_COPYABLECANVASLAYER_H
#define GFX_COPYABLECANVASLAYER_H
#include <stdint.h> // for uint32_t
#include "GLContextTypes.h" // for GLContext
#include "Layers.h" // for CanvasLayer, etc
#include "gfxASurface.h" // for gfxASurface
#include "gfxContext.h" // for gfxContext, etc
#include "gfxTypes.h"
#include "gfxPlatform.h" // for gfxImageFormat
#include "mozilla/Assertions.h" // for MOZ_ASSERT, etc
#include "mozilla/Preferences.h" // for Preferences
#include "mozilla/RefPtr.h" // for RefPtr
#include "mozilla/gfx/2D.h" // for DrawTarget
#include "mozilla/mozalloc.h" // for operator delete, etc
#include "nsAutoPtr.h" // for nsRefPtr
#include "nsTraceRefcnt.h" // for MOZ_COUNT_CTOR, etc
namespace mozilla {
namespace layers {
class CanvasClientWebGL;
/**
* A shared CanvasLayer implementation that supports copying
* its contents into a gfxASurface using UpdateSurface.
*/
class CopyableCanvasLayer : public CanvasLayer
{
public:
CopyableCanvasLayer(LayerManager* aLayerManager, void *aImplData);
virtual ~CopyableCanvasLayer();
virtual void Initialize(const Data& aData);
virtual bool IsDataValid(const Data& aData);
protected:
void PaintWithOpacity(gfxContext* aContext,
float aOpacity,
Layer* aMaskLayer,
gfxContext::GraphicsOperator aOperator = gfxContext::OPERATOR_OVER);
void UpdateSurface(gfxASurface* aDestSurface = nullptr,
Layer* aMaskLayer = nullptr);
nsRefPtr<gfxASurface> mSurface;
nsRefPtr<mozilla::gl::GLContext> mGLContext;
mozilla::RefPtr<mozilla::gfx::DrawTarget> mDrawTarget;
uint32_t mCanvasFramebuffer;
bool mIsGLAlphaPremult;
bool mNeedsYFlip;
bool mForceReadback;
nsRefPtr<gfxImageSurface> mCachedTempSurface;
gfx::IntSize mCachedSize;
gfxImageFormat mCachedFormat;
gfxImageSurface* GetTempSurface(const gfx::IntSize& aSize, const gfxImageFormat aFormat);
void DiscardTempSurface();
};
}
}
#endif