michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef GFX_AUTOMASKDATA_H_
michael@0: #define GFX_AUTOMASKDATA_H_
michael@0: 
michael@0: #include "mozilla/layers/LayersSurfaces.h"  // for SurfaceDescriptor
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace layers {
michael@0: 
michael@0: /**
michael@0:  * Drawing with a mask requires a mask surface and a transform.
michael@0:  *
michael@0:  * This helper class manages the SourceSurface logic.
michael@0:  */
michael@0: class MOZ_STACK_CLASS AutoMoz2DMaskData {
michael@0: public:
michael@0:   AutoMoz2DMaskData() { }
michael@0:   ~AutoMoz2DMaskData() { }
michael@0: 
michael@0:   void Construct(const gfx::Matrix& aTransform,
michael@0:                  gfx::SourceSurface* aSurface)
michael@0:   {
michael@0:     MOZ_ASSERT(!IsConstructed());
michael@0:     mTransform = aTransform;
michael@0:     mSurface = aSurface;
michael@0:   }
michael@0: 
michael@0:   gfx::SourceSurface* GetSurface()
michael@0:   {
michael@0:     MOZ_ASSERT(IsConstructed());
michael@0:     return mSurface.get();
michael@0:   }
michael@0: 
michael@0:   const gfx::Matrix& GetTransform()
michael@0:   {
michael@0:     MOZ_ASSERT(IsConstructed());
michael@0:     return mTransform;
michael@0:   }
michael@0: 
michael@0: private:
michael@0:   bool IsConstructed()
michael@0:   {
michael@0:     return !!mSurface;
michael@0:   }
michael@0: 
michael@0:   gfx::Matrix mTransform;
michael@0:   RefPtr<gfx::SourceSurface> mSurface;
michael@0: 
michael@0:   AutoMoz2DMaskData(const AutoMoz2DMaskData&) MOZ_DELETE;
michael@0:   AutoMoz2DMaskData& operator=(const AutoMoz2DMaskData&) MOZ_DELETE;
michael@0: };
michael@0: 
michael@0: }
michael@0: }
michael@0: 
michael@0: #endif // GFX_AUTOMASKDATA_H_