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61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
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/* -*- 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_AUTOMASKDATA_H_
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#define GFX_AUTOMASKDATA_H_
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#include "gfxASurface.h"
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#include "mozilla/layers/LayersSurfaces.h" // for SurfaceDescriptor
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namespace mozilla {
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namespace layers {
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/**
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* Drawing with a mask requires a mask surface and a transform.
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* Sometimes the mask surface is a direct gfxASurface, but other times
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* it's a SurfaceDescriptor. For SurfaceDescriptor, we need to use a
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* scoped AutoOpenSurface to get a gfxASurface for the
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* SurfaceDescriptor.
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*
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* This helper class manages the gfxASurface-or-SurfaceDescriptor
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* logic.
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*/
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class MOZ_STACK_CLASS AutoMaskData {
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public:
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AutoMaskData() { }
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~AutoMaskData() { }
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/**
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* Construct this out of either a gfxASurface or a
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* SurfaceDescriptor. Construct() must only be called once.
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* GetSurface() and GetTransform() must not be called until this has
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* been constructed.
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*/
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void Construct(const gfxMatrix& aTransform,
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gfxASurface* aSurface);
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void Construct(const gfxMatrix& aTransform,
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const SurfaceDescriptor& aSurface);
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/** The returned surface can't escape the scope of |this|. */
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gfxASurface* GetSurface();
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const gfxMatrix& GetTransform();
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private:
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bool IsConstructed();
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gfxMatrix mTransform;
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nsRefPtr<gfxASurface> mSurface;
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Maybe<AutoOpenSurface> mSurfaceOpener;
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AutoMaskData(const AutoMaskData&) MOZ_DELETE;
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AutoMaskData& operator=(const AutoMaskData&) MOZ_DELETE;
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};
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}
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}
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#endif // GFX_AUTOMASKDATA_H_
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