/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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_AUTOMASKDATA_H_

#define GFX_AUTOMASKDATA_H_

#include "mozilla/layers/LayersSurfaces.h"  // for SurfaceDescriptor

namespace mozilla {

namespace layers {

/**

 * Drawing with a mask requires a mask surface and a transform.

 *

 * This helper class manages the SourceSurface logic.

 */

class MOZ_STACK_CLASS AutoMoz2DMaskData {

public:

  AutoMoz2DMaskData() { }

  ~AutoMoz2DMaskData() { }

  void Construct(const gfx::Matrix& aTransform,

                 gfx::SourceSurface* aSurface)

  {

    MOZ_ASSERT(!IsConstructed());

    mTransform = aTransform;

    mSurface = aSurface;

  }

  gfx::SourceSurface* GetSurface()

  {

    MOZ_ASSERT(IsConstructed());

    return mSurface.get();

  }

  const gfx::Matrix& GetTransform()

  {

    MOZ_ASSERT(IsConstructed());

    return mTransform;

  }

private:

  bool IsConstructed()

  {

    return !!mSurface;

  }

  gfx::Matrix mTransform;

  RefPtr<gfx::SourceSurface> mSurface;

  AutoMoz2DMaskData(const AutoMoz2DMaskData&) = delete;

  AutoMoz2DMaskData& operator=(const AutoMoz2DMaskData&) = delete;

};

} // namespace layers

} // namespace mozilla

#endif // GFX_AUTOMASKDATA_H_