/* -*- 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_BASICCOMPOSITOR_H

#define MOZILLA_GFX_BASICCOMPOSITOR_H

#include "mozilla/layers/Compositor.h"

#include "mozilla/layers/TextureHost.h"

#include "mozilla/gfx/2D.h"

#include "mozilla/gfx/Triangle.h"

#include "mozilla/gfx/Polygon.h"

namespace mozilla {

namespace layers {

class BasicCompositingRenderTarget : public CompositingRenderTarget

{

public:

  BasicCompositingRenderTarget(gfx::DrawTarget* aDrawTarget, const gfx::IntRect& aRect)

    : CompositingRenderTarget(aRect.TopLeft())

    , mDrawTarget(aDrawTarget)

    , mSize(aRect.Size())

  { }

  virtual const char* Name() const override { return "BasicCompositingRenderTarget"; }

  virtual gfx::IntSize GetSize() const override { return mSize; }

  void BindRenderTarget();

  virtual gfx::SurfaceFormat GetFormat() const override

  {

    return mDrawTarget ? mDrawTarget->GetFormat()

                       : gfx::SurfaceFormat(gfx::SurfaceFormat::UNKNOWN);

  }

  RefPtr<gfx::DrawTarget> mDrawTarget;

  gfx::IntSize mSize;

};

class BasicCompositor : public Compositor

{

public:

  explicit BasicCompositor(CompositorBridgeParent* aParent, widget::CompositorWidget* aWidget);

protected:

  virtual ~BasicCompositor();

public:

  virtual BasicCompositor* AsBasicCompositor() override { return this; }

  virtual bool Initialize(nsCString* const out_failureReason) override;

  virtual void DetachWidget() override;

  virtual TextureFactoryIdentifier GetTextureFactoryIdentifier() override;

  virtual already_AddRefed<CompositingRenderTarget>

  CreateRenderTarget(const gfx::IntRect &aRect, SurfaceInitMode aInit) override;

  virtual already_AddRefed<CompositingRenderTarget>

  CreateRenderTargetFromSource(const gfx::IntRect &aRect,

                               const CompositingRenderTarget *aSource,

                               const gfx::IntPoint &aSourcePoint) override;

  virtual already_AddRefed<CompositingRenderTarget>

  CreateRenderTargetForWindow(const LayoutDeviceIntRect& aRect,

                              const LayoutDeviceIntRect& aClearRect,

                              BufferMode aBufferMode);

  virtual already_AddRefed<DataTextureSource>

  CreateDataTextureSource(TextureFlags aFlags = TextureFlags::NO_FLAGS) override;

  virtual already_AddRefed<DataTextureSource>

  CreateDataTextureSourceAround(gfx::DataSourceSurface* aSurface) override;

  virtual already_AddRefed<DataTextureSource>

  CreateDataTextureSourceAroundYCbCr(TextureHost* aTexture) override;

  virtual bool SupportsEffect(EffectTypes aEffect) override;

  bool SupportsLayerGeometry() const override;

  virtual void SetRenderTarget(CompositingRenderTarget *aSource) override

  {

    mRenderTarget = static_cast<BasicCompositingRenderTarget*>(aSource);

    mRenderTarget->BindRenderTarget();

  }

  virtual CompositingRenderTarget* GetCurrentRenderTarget() const override

  {

    return mRenderTarget;

  }

  virtual void DrawQuad(const gfx::Rect& aRect,

                        const gfx::IntRect& aClipRect,

                        const EffectChain &aEffectChain,

                        gfx::Float aOpacity,

                        const gfx::Matrix4x4& aTransform,

                        const gfx::Rect& aVisibleRect) override;

  virtual void ClearRect(const gfx::Rect& aRect) override;

  virtual void BeginFrame(const nsIntRegion& aInvalidRegion,

                          const gfx::IntRect *aClipRectIn,

                          const gfx::IntRect& aRenderBounds,

                          const nsIntRegion& aOpaqueRegion,

                          gfx::IntRect *aClipRectOut = nullptr,

                          gfx::IntRect *aRenderBoundsOut = nullptr) override;

  virtual void EndFrame() override;

  virtual bool SupportsPartialTextureUpdate() override { return true; }

  virtual bool CanUseCanvasLayerForSize(const gfx::IntSize &aSize) override { return true; }

  virtual int32_t GetMaxTextureSize() const override;

  virtual void SetDestinationSurfaceSize(const gfx::IntSize& aSize) override { }

  virtual void SetScreenRenderOffset(const ScreenPoint& aOffset) override {

  }

  virtual void MakeCurrent(MakeCurrentFlags aFlags = 0) override { }

#ifdef MOZ_DUMP_PAINTING

  virtual const char* Name() const override { return "Basic"; }

#endif // MOZ_DUMP_PAINTING

  virtual LayersBackend GetBackendType() const override {

    return LayersBackend::LAYERS_BASIC;

  }

  gfx::DrawTarget *GetDrawTarget() { return mDrawTarget; }

  virtual bool IsPendingComposite() override

  {

    return mIsPendingEndRemoteDrawing;

  }

  virtual void FinishPendingComposite() override;

private:

  template<typename Geometry>

  void DrawGeometry(const Geometry& aGeometry,

                    const gfx::Rect& aRect,

                    const gfx::IntRect& aClipRect,

                    const EffectChain& aEffectChain,

                    gfx::Float aOpacity,

                    const gfx::Matrix4x4& aTransform,

                    const gfx::Rect& aVisibleRect,

                    const bool aEnableAA);

  virtual void DrawPolygon(const gfx::Polygon& aPolygon,

                           const gfx::Rect& aRect,

                           const gfx::IntRect& aClipRect,

                           const EffectChain& aEffectChain,

                           gfx::Float aOpacity,

                           const gfx::Matrix4x4& aTransform,

                           const gfx::Rect& aVisibleRect) override;

  void TryToEndRemoteDrawing(bool aForceToEnd = false);

  bool NeedsToDeferEndRemoteDrawing();

  // The final destination surface

  RefPtr<gfx::DrawTarget> mDrawTarget;

  // The current render target for drawing

  RefPtr<BasicCompositingRenderTarget> mRenderTarget;

  LayoutDeviceIntRect mInvalidRect;

  LayoutDeviceIntRegion mInvalidRegion;

  uint32_t mMaxTextureSize;

  bool mIsPendingEndRemoteDrawing;

};

BasicCompositor* AssertBasicCompositor(Compositor* aCompositor);

} // namespace layers

} // namespace mozilla

#endif /* MOZILLA_GFX_BASICCOMPOSITOR_H */