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path: root/gfx/layers/composite/CanvasLayerComposite.cpp
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/* -*- 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 "CanvasLayerComposite.h"
#include "composite/CompositableHost.h"  // for CompositableHost
#include "gfx2DGlue.h"                   // for ToFilter
#include "gfxEnv.h"                      // for gfxEnv, etc
#include "mozilla/gfx/Matrix.h"          // for Matrix4x4
#include "mozilla/gfx/Point.h"           // for Point
#include "mozilla/gfx/Rect.h"            // for Rect
#include "mozilla/layers/Compositor.h"   // for Compositor
#include "mozilla/layers/Effects.h"      // for EffectChain
#include "mozilla/mozalloc.h"            // for operator delete
#include "nsAString.h"
#include "mozilla/RefPtr.h"   // for nsRefPtr
#include "nsISupportsImpl.h"  // for MOZ_COUNT_CTOR, etc
#include "nsString.h"         // for nsAutoCString

namespace mozilla {
namespace layers {

using namespace mozilla::gfx;

CanvasLayerComposite::CanvasLayerComposite(LayerManagerComposite* aManager)
    : CanvasLayer(aManager, nullptr),
      LayerComposite(aManager),
      mCompositableHost(nullptr) {
  MOZ_COUNT_CTOR(CanvasLayerComposite);
  mImplData = static_cast<LayerComposite*>(this);
}

CanvasLayerComposite::~CanvasLayerComposite() {
  MOZ_COUNT_DTOR(CanvasLayerComposite);

  CleanupResources();
}

bool CanvasLayerComposite::SetCompositableHost(CompositableHost* aHost) {
  switch (aHost->GetType()) {
    case CompositableType::IMAGE: {
      if (mCompositableHost && aHost != mCompositableHost) {
        mCompositableHost->Detach(this);
      }
      mCompositableHost = aHost;
      return true;
    }
    default:
      return false;
  }
}

Layer* CanvasLayerComposite::GetLayer() { return this; }

void CanvasLayerComposite::SetLayerManager(HostLayerManager* aManager) {
  LayerComposite::SetLayerManager(aManager);
  mManager = aManager;
  if (mCompositableHost && mCompositor) {
    mCompositableHost->SetTextureSourceProvider(mCompositor);
  }
}

void CanvasLayerComposite::RenderLayer(const IntRect& aClipRect,
                                       const Maybe<gfx::Polygon>& aGeometry) {
  if (!mCompositableHost || !mCompositableHost->IsAttached()) {
    return;
  }

  mCompositor->MakeCurrent();

#ifdef MOZ_DUMP_PAINTING
  if (gfxEnv::DumpCompositorTextures()) {
    RefPtr<gfx::DataSourceSurface> surf = mCompositableHost->GetAsSurface();
    if (surf) {
      WriteSnapshotToDumpFile(this, surf);
    }
  }
#endif

  RenderWithAllMasks(this, mCompositor, aClipRect,
                     [&](EffectChain& effectChain, const IntRect& clipRect) {
                       mCompositableHost->Composite(
                           mCompositor, this, effectChain,
                           GetEffectiveOpacity(), GetEffectiveTransform(),
                           GetSamplingFilter(), clipRect);
                     });

  mCompositableHost->BumpFlashCounter();
}

CompositableHost* CanvasLayerComposite::GetCompositableHost() {
  if (mCompositableHost && mCompositableHost->IsAttached()) {
    return mCompositableHost.get();
  }

  return nullptr;
}

void CanvasLayerComposite::CleanupResources() {
  if (mCompositableHost) {
    mCompositableHost->Detach(this);
  }
  mCompositableHost = nullptr;
}

gfx::SamplingFilter CanvasLayerComposite::GetSamplingFilter() {
  gfx::SamplingFilter filter = mSamplingFilter;
#ifdef ANDROID
  // Bug 691354
  // Using the LINEAR filter we get unexplained artifacts.
  // Use NEAREST when no scaling is required.
  Matrix matrix;
  bool is2D = GetEffectiveTransform().Is2D(&matrix);
  if (is2D && !ThebesMatrix(matrix).HasNonTranslationOrFlip()) {
    filter = SamplingFilter::POINT;
  }
#endif
  return filter;
}

void CanvasLayerComposite::GenEffectChain(EffectChain& aEffect) {
  aEffect.mLayerRef = this;
  aEffect.mPrimaryEffect = mCompositableHost->GenEffect(GetSamplingFilter());
}

void CanvasLayerComposite::PrintInfo(std::stringstream& aStream,
                                     const char* aPrefix) {
  CanvasLayer::PrintInfo(aStream, aPrefix);
  aStream << "\n";
  if (mCompositableHost && mCompositableHost->IsAttached()) {
    nsAutoCString pfx(aPrefix);
    pfx += "  ";
    mCompositableHost->PrintInfo(aStream, pfx.get());
  }
}

}  // namespace layers
}  // namespace mozilla