/* -*- 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 mozilla_gfx_layers_mlgpu_MaskOperation_h

#define mozilla_gfx_layers_mlgpu_MaskOperation_h

#include "mozilla/RefPtr.h"

#include "mozilla/gfx/Rect.h"

#include "SharedBufferMLGPU.h"

#include <vector>

namespace mozilla {

namespace layers {

class FrameBuilder;

class Layer;

class MLGDevice;

class MLGRenderTarget;

class MLGTexture;

class TextureSource;

class MaskOperation

{

  NS_INLINE_DECL_REFCOUNTING(MaskOperation)

public:

  // For when the exact texture is known ahead of time.

  MaskOperation(FrameBuilder* aBuilder, MLGTexture* aSource);

  // Return the mask rectangle in screen coordinates. This function takes a

  // layer because a single-texture mask operation is not dependent on a

  // specific mask transform. (Multiple mask layer operations are, and they

  // ignore the layer parameter).

  virtual gfx::Rect ComputeMaskRect(Layer* aLayer) const;

  MLGTexture* GetTexture() const {

    return mTexture;

  }

  bool IsEmpty() const {

    return !mTexture;

  }

protected:

  explicit MaskOperation(FrameBuilder* aBuilder);

  virtual ~MaskOperation();

protected:

  RefPtr<MLGTexture> mTexture;

};

struct MaskTexture

{

  MaskTexture() : mSource(nullptr)

  {}

  MaskTexture(const gfx::Rect& aRect, TextureSource* aSource)

   : mRect(aRect), mSource(aSource)

  {}

  bool operator <(const MaskTexture& aOther) const;

  gfx::Rect mRect;

  RefPtr<TextureSource> mSource;

};

typedef std::vector<MaskTexture> MaskTextureList;

class MaskCombineOperation final : public MaskOperation

{

public:

  explicit MaskCombineOperation(FrameBuilder* aBuilder);

  ~MaskCombineOperation() override;

  void Init(const MaskTextureList& aTextures);

  void PrepareForRendering();

  void Render();

  gfx::Rect ComputeMaskRect(Layer* aLayer) const override {

    return mArea;

  }

private:

  FrameBuilder* mBuilder;

  gfx::Rect mArea;

  MaskTextureList mTextures;

  RefPtr<MLGRenderTarget> mTarget;

  std::vector<VertexBufferSection> mInputBuffers;

};

RefPtr<TextureSource> GetMaskLayerTexture(Layer* aLayer);

void AppendToMaskTextureList(MaskTextureList& aList, Layer* aLayer);

} // namespace layers

} // namespace mozilla

#endif // mozilla_gfx_layers_mlgpu_MaskOperation_h