/* -*- 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/. */

#include "TexturedLayerMLGPU.h"

#include "LayerManagerMLGPU.h"

#include "RenderViewMLGPU.h"

#include "FrameBuilder.h"

#include "mozilla/gfx/Types.h"

#include "mozilla/layers/ImageHost.h"

#include "UnitTransforms.h"

namespace mozilla {

namespace layers {

using namespace gfx;

TexturedLayerMLGPU::TexturedLayerMLGPU(LayerManagerMLGPU* aManager)

 : LayerMLGPU(aManager)

{

}

TexturedLayerMLGPU::~TexturedLayerMLGPU()

{

  // Note: we have to cleanup resources in derived classes, since we can't

  // easily tell in our destructor if we have a TempImageLayerMLGPU, which

  // should not have its compositable detached, and we can't call GetLayer

  // here.

}

bool

TexturedLayerMLGPU::SetCompositableHost(CompositableHost* aHost)

{

  switch (aHost->GetType()) {

    case CompositableType::IMAGE:

      mHost = aHost->AsImageHost();

      return true;

    default:

      return false;

  }

}

CompositableHost*

TexturedLayerMLGPU::GetCompositableHost()

{

  if (mHost && mHost->IsAttached()) {

    return mHost.get();

  }

  return nullptr;

}

RefPtr<TextureSource>

TexturedLayerMLGPU::BindAndGetTexture()

{

  if (!mHost) {

    return nullptr;

  }

  LayerManagerMLGPU* lm = GetLayerManager()->AsLayerManagerMLGPU();

  // Note: we don't call FinishRendering since mask layers do not need

  // composite notifications or bias updates. (This function should

  // not be called for non-mask-layers).

  ImageHost::RenderInfo info;

  if (!mHost->PrepareToRender(lm->GetTextureSourceProvider(), &info)) {

    return nullptr;

  }

  RefPtr<TextureSource> source = mHost->AcquireTextureSource(info);

  if (!source) {

    return nullptr;

  }

  mTexture = source;

  return source;

}

bool

TexturedLayerMLGPU::OnPrepareToRender(FrameBuilder* aBuilder)

{

  if (!mHost) {

    return false;

  }

  LayerManagerMLGPU* lm = GetLayerManager()->AsLayerManagerMLGPU();

  ImageHost::RenderInfo info;

  if (!mHost->PrepareToRender(lm->GetTextureSourceProvider(), &info)) {

    return false;

  }

  RefPtr<TextureSource> source = mHost->AcquireTextureSource(info);

  if (!source) {

    return false;

  }

  if (source->AsBigImageIterator()) {

    mBigImageTexture = source;

    mTexture = nullptr;

  } else {

    mTexture = source;

  }

  mPictureRect = IntRect(0, 0, info.img->mPictureRect.Width(), info.img->mPictureRect.Height());

  mHost->FinishRendering(info);

  return true;

}

void

TexturedLayerMLGPU::AssignToView(FrameBuilder* aBuilder,

                                 RenderViewMLGPU* aView,

                                 Maybe<Polygon>&& aGeometry)

{

  if (mBigImageTexture) {

    BigImageIterator* iter = mBigImageTexture->AsBigImageIterator();

    iter->BeginBigImageIteration();

    AssignBigImage(aBuilder, aView, iter, aGeometry);

    iter->EndBigImageIteration();

  } else {

    LayerMLGPU::AssignToView(aBuilder, aView, std::move(aGeometry));

  }

}

void

TexturedLayerMLGPU::AssignBigImage(FrameBuilder* aBuilder,

                                   RenderViewMLGPU* aView,

                                   BigImageIterator* aIter,

                                   const Maybe<Polygon>& aGeometry)

{

  const Matrix4x4& transform = GetLayer()->GetEffectiveTransformForBuffer();

  // Note that we don't need to assign these in any particular order, since

  // they do not overlap.

  do {

    IntRect tileRect = aIter->GetTileRect();

    IntRect rect = tileRect.Intersect(mPictureRect);

    if (rect.IsEmpty()) {

      continue;

    }

    {

      Rect screenRect = transform.TransformBounds(Rect(rect));

      screenRect.MoveBy(-aView->GetTargetOffset());

      screenRect = screenRect.Intersect(Rect(mComputedClipRect.ToUnknownRect()));

      if (screenRect.IsEmpty()) {

        // This tile is not in the clip region, so skip it.

        continue;

      }

    }

    RefPtr<TextureSource> tile = mBigImageTexture->ExtractCurrentTile();

    if (!tile) {

      continue;

    }

    // Create a temporary item.

    RefPtr<TempImageLayerMLGPU> item = new TempImageLayerMLGPU(aBuilder->GetManager());

    item->Init(this, tile, rect);

    Maybe<Polygon> geometry = aGeometry;

    item->AddBoundsToView(aBuilder, aView, std::move(geometry));

    // Since the layer tree is not holding this alive, we have to ask the

    // FrameBuilder to do it for us.

    aBuilder->RetainTemporaryLayer(item);

  } while (aIter->NextTile());

}

TempImageLayerMLGPU::TempImageLayerMLGPU(LayerManagerMLGPU* aManager)

 : ImageLayer(aManager, static_cast<HostLayer*>(this)),

   TexturedLayerMLGPU(aManager),

   mFilter(gfx::SamplingFilter::GOOD),

   mIsOpaque(false)

{

}

TempImageLayerMLGPU::~TempImageLayerMLGPU()

{

}

void

TempImageLayerMLGPU::Init(TexturedLayerMLGPU* aSource,

                          const RefPtr<TextureSource>& aTexture,

                          const gfx::IntRect& aPictureRect)

{

  // ImageLayer properties.

  mEffectiveTransform = aSource->GetLayer()->GetEffectiveTransform();

  mEffectiveTransformForBuffer = aSource->GetLayer()->GetEffectiveTransformForBuffer();

  // Base LayerMLGPU properties.

  mComputedClipRect = aSource->GetComputedClipRect();

  mMask = aSource->GetMask();

  mComputedOpacity = aSource->GetComputedOpacity();

  // TexturedLayerMLGPU properties.

  mHost = aSource->GetImageHost();

  mTexture = aTexture;

  mPictureRect = aPictureRect;

  // Local properties.

  mFilter = aSource->GetSamplingFilter();

  mShadowVisibleRegion = aSource->GetShadowVisibleRegion();

  mIsOpaque = aSource->IsContentOpaque();

  // Set this layer to prepared so IsPrepared() assertions don't fire.

  MarkPrepared();

}

} // namespace layers

} // namespace mozilla