/* -*- 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_PAINTEDLAYERMLGPU_H

#define MOZILLA_GFX_PAINTEDLAYERMLGPU_H

#include "LayerManagerMLGPU.h"

#include "mozilla/layers/ContentHost.h"

#include "MLGDeviceTypes.h"

#include "nsRegionFwd.h"

#include <functional>

namespace mozilla {

namespace layers {

class TiledLayerBufferComposite;

class PaintedLayerMLGPU final

  : public PaintedLayer,

    public LayerMLGPU

{

public:

  explicit PaintedLayerMLGPU(LayerManagerMLGPU* aManager);

  ~PaintedLayerMLGPU() override;

  // Layer

  HostLayer* AsHostLayer() override { return this; }

  PaintedLayerMLGPU* AsPaintedLayerMLGPU() override { return this; }

  virtual Layer* GetLayer() override { return this; }

  bool SetCompositableHost(CompositableHost*) override;

  CompositableHost* GetCompositableHost() override;

  void Disconnect() override;

  bool IsContentOpaque() override;

  // PaintedLayer

  void InvalidateRegion(const nsIntRegion& aRegion) override { 

    MOZ_CRASH("PaintedLayerMLGPU can't fill invalidated regions");

  }

  bool HasComponentAlpha() const {

    return !!mTextureOnWhite;

  }

  TextureSource* GetTexture() const {

    return mTexture;

  }

  TextureSource* GetTextureOnWhite() const {

    MOZ_ASSERT(HasComponentAlpha());

    return mTextureOnWhite;

  }

  gfx::Point GetDestOrigin() const;

  SamplerMode GetSamplerMode() {

    // Note that when resamping, we must break the texture coordinates into

    // no-repeat rects. When we have simple integer translations we can

    // simply wrap around the edge of the buffer texture.

    return MayResample()

           ? SamplerMode::LinearClamp

           : SamplerMode::LinearRepeat;

  }

  void SetRenderRegion(LayerIntRegion&& aRegion) override;

  // To avoid sampling issues with complex regions and transforms, we

  // squash the visible region for PaintedLayers into a single draw

  // rect. RenderPasses should use this method instead of GetRenderRegion.

  const LayerIntRegion& GetDrawRects();

  MOZ_LAYER_DECL_NAME("PaintedLayerMLGPU", TYPE_PAINTED)

  void CleanupCachedResources();

protected:

  void PrintInfo(std::stringstream& aStream, const char* aPrefix) override;

  bool OnPrepareToRender(FrameBuilder* aBuilder) override;

  // We override this to support tiling.

  void AssignToView(FrameBuilder* aBuilder,

                    RenderViewMLGPU* aView,

                    Maybe<gfx::Polygon>&& aGeometry) override;

  void AssignHighResTilesToView(FrameBuilder* aBuilder,

                                RenderViewMLGPU* aView,

                                TiledContentHost* aTileHost,

                                const Maybe<gfx::Polygon>& aGeometry);

  // Helper for Assign*TilesToView.

  void AssignTileBufferToView(FrameBuilder* aBuilder,

                              RenderViewMLGPU* aView,

                              TiledLayerBufferComposite& aTiles,

                              const LayerIntRegion& aCompositeRegion,

                              const Maybe<gfx::Polygon>& aGeometry);

  void CleanupResources();

private:

  RefPtr<ContentHost> mHost;

  RefPtr<TextureSource> mTexture;

  RefPtr<TextureSource> mTextureOnWhite;

#ifndef MOZ_IGNORE_PAINT_WILL_RESAMPLE

  LayerIntRegion mDrawRects;

#endif

  gfx::IntPoint mDestOrigin;

};

} // namespace layers

} // namespace mozilla

#endif