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92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GFX_COPYABLECANVASLAYER_H
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#define GFX_COPYABLECANVASLAYER_H
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#include "Layers.h"
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#include "mozilla/layers/CanvasClient.h"
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#include "mozilla/Preferences.h"
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#include "gfxPlatform.h"
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using namespace mozilla::gfx;
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namespace mozilla {
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namespace layers {
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class CanvasClient2D;
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class CanvasClientWebGL;
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/**
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* A shared CanvasLayer implementation that supports copying
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* its contents into a gfxASurface using UpdateSurface.
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*/
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class CopyableCanvasLayer : public CanvasLayer
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{
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public:
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CopyableCanvasLayer(LayerManager* aLayerManager, void *aImplData) :
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CanvasLayer(aLayerManager, aImplData)
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{
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MOZ_COUNT_CTOR(CopyableCanvasLayer);
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mForceReadback = Preferences::GetBool("webgl.force-layers-readback", false);
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}
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virtual ~CopyableCanvasLayer()
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{
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MOZ_COUNT_DTOR(CopyableCanvasLayer);
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}
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virtual void Initialize(const Data& aData);
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protected:
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void PaintWithOpacity(gfxContext* aContext,
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float aOpacity,
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Layer* aMaskLayer,
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gfxContext::GraphicsOperator aOperator = gfxContext::OPERATOR_OVER);
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void UpdateSurface(gfxASurface* aDestSurface = nullptr, Layer* aMaskLayer = nullptr);
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nsRefPtr<gfxASurface> mSurface;
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nsRefPtr<mozilla::gl::GLContext> mGLContext;
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mozilla::RefPtr<mozilla::gfx::DrawTarget> mDrawTarget;
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uint32_t mCanvasFramebuffer;
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bool mIsGLAlphaPremult;
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bool mNeedsYFlip;
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bool mForceReadback;
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nsRefPtr<gfxImageSurface> mCachedTempSurface;
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gfxIntSize mCachedSize;
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gfxImageFormat mCachedFormat;
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gfxImageSurface* GetTempSurface(const gfxIntSize& aSize, const gfxImageFormat aFormat)
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{
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if (!mCachedTempSurface ||
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aSize.width != mCachedSize.width ||
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aSize.height != mCachedSize.height ||
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aFormat != mCachedFormat)
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{
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mCachedTempSurface = new gfxImageSurface(aSize, aFormat);
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mCachedSize = aSize;
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mCachedFormat = aFormat;
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}
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MOZ_ASSERT(mCachedTempSurface->Stride() == mCachedTempSurface->Width() * 4);
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return mCachedTempSurface;
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}
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void DiscardTempSurface()
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{
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mCachedTempSurface = nullptr;
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}
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};
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}
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}
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#endif
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