77 lines
2.8 KiB
C++
77 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 20; 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 MOZILLA_GFX_PersistentBUFFERPROVIDER_H
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#define MOZILLA_GFX_PersistentBUFFERPROVIDER_H
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#include "mozilla/Assertions.h" // for MOZ_ASSERT, etc
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#include "mozilla/RefPtr.h" // for RefPtr, already_AddRefed, etc
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#include "mozilla/layers/LayersTypes.h"
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#include "mozilla/layers/CompositableForwarder.h"
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#include "mozilla/gfx/Types.h"
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namespace mozilla {
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namespace layers {
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class CopyableCanvasLayer;
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/**
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* A PersistentBufferProvider is for users which require the temporary use of
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* a DrawTarget to draw into. When they're done drawing they return the
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* DrawTarget, when they later need to continue drawing they get a DrawTarget
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* from the provider again, the provider will guarantee the contents of the
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* previously returned DrawTarget is persisted into the one newly returned.
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*/
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class PersistentBufferProvider : public RefCounted<PersistentBufferProvider>
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{
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public:
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MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(PersistentBufferProvider)
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virtual ~PersistentBufferProvider() { }
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virtual LayersBackend GetType() { return LayersBackend::LAYERS_NONE; }
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/**
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* Get a DrawTarget from the PersistentBufferProvider.
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*
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* \param aPersistedRect This indicates the area of the DrawTarget that needs
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* to have remained the same since the call to
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* ReturnAndUseDT.
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*/
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virtual gfx::DrawTarget* GetDT(const gfx::IntRect& aPersistedRect) = 0;
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/**
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* Return a DrawTarget to the PersistentBufferProvider and indicate the
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* contents of this DrawTarget is to be considered current by the
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* BufferProvider
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*/
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virtual bool ReturnAndUseDT(gfx::DrawTarget* aDT) = 0;
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virtual already_AddRefed<gfx::SourceSurface> GetSnapshot() = 0;
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protected:
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};
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class PersistentBufferProviderBasic : public PersistentBufferProvider
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{
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public:
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MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(PersistentBufferProviderBasic)
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PersistentBufferProviderBasic(gfx::IntSize aSize, gfx::SurfaceFormat aFormat,
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gfx::BackendType aBackend);
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explicit PersistentBufferProviderBasic(gfx::DrawTarget* aTarget) : mDrawTarget(aTarget) {}
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bool IsValid() { return !!mDrawTarget; }
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virtual LayersBackend GetType() { return LayersBackend::LAYERS_BASIC; }
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gfx::DrawTarget* GetDT(const gfx::IntRect& aPersistedRect) { return mDrawTarget; }
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bool ReturnAndUseDT(gfx::DrawTarget* aDT) { MOZ_ASSERT(mDrawTarget == aDT); return true; }
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virtual already_AddRefed<gfx::SourceSurface> GetSnapshot() { return mDrawTarget->Snapshot(); }
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private:
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RefPtr<gfx::DrawTarget> mDrawTarget;
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};
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} // namespace layers
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} // namespace mozilla
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#endif
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