/* -*- 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 "PaintedLayerComposite.h"
#include "CompositableHost.h"            // for TiledLayerProperties, etc
#include "FrameMetrics.h"                // for FrameMetrics
#include "Units.h"                       // for CSSRect, LayerPixel, etc
#include "gfxEnv.h"                      // for gfxEnv
#include "mozilla/Assertions.h"          // for MOZ_ASSERT, etc
#include "mozilla/gfx/Matrix.h"          // for Matrix4x4
#include "mozilla/gfx/Point.h"           // for Point
#include "mozilla/gfx/Polygon.h"         // for Polygon
#include "mozilla/gfx/Rect.h"            // for RoundedToInt, Rect
#include "mozilla/gfx/Types.h"           // for SamplingFilter::LINEAR
#include "mozilla/layers/Compositor.h"   // for Compositor
#include "mozilla/layers/ContentHost.h"  // for ContentHost
#include "mozilla/layers/Effects.h"      // for EffectChain
#include "mozilla/layers/LayerManagerCompositeUtils.h"
#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 "nsMathUtils.h"      // for NS_lround
#include "nsString.h"         // for nsAutoCString
#include "TextRenderer.h"
#include "GeckoProfiler.h"

namespace mozilla {
namespace layers {

PaintedLayerComposite::PaintedLayerComposite(LayerManagerComposite* aManager)
    : PaintedLayer(aManager, nullptr),
      LayerComposite(aManager),
      mBuffer(nullptr) {
  MOZ_COUNT_CTOR(PaintedLayerComposite);
  mImplData = static_cast<LayerComposite*>(this);
}

PaintedLayerComposite::~PaintedLayerComposite() {
  MOZ_COUNT_DTOR(PaintedLayerComposite);
  CleanupResources();
}

bool PaintedLayerComposite::SetCompositableHost(CompositableHost* aHost) {
  switch (aHost->GetType()) {
    case CompositableType::CONTENT_TILED:
    case CompositableType::CONTENT_SINGLE:
    case CompositableType::CONTENT_DOUBLE: {
      ContentHost* newBuffer = static_cast<ContentHost*>(aHost);
      if (mBuffer && newBuffer != mBuffer) {
        mBuffer->Detach(this);
      }
      mBuffer = newBuffer;
      return true;
    }
    default:
      return false;
  }
}

void PaintedLayerComposite::Disconnect() { Destroy(); }

void PaintedLayerComposite::Destroy() {
  if (!mDestroyed) {
    CleanupResources();
    mDestroyed = true;
  }
}

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

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

void PaintedLayerComposite::RenderLayer(const gfx::IntRect& aClipRect,
                                        const Maybe<gfx::Polygon>& aGeometry) {
  if (!mBuffer || !mBuffer->IsAttached()) {
    return;
  }
  AUTO_PROFILER_LABEL("PaintedLayerComposite::RenderLayer", GRAPHICS);

  Compositor* compositor = mCompositeManager->GetCompositor();

  MOZ_ASSERT(mBuffer->GetTextureSourceProvider() == compositor &&
                 mBuffer->GetLayer() == this,
             "buffer is corrupted");

  const nsIntRegion visibleRegion = GetLocalVisibleRegion().ToUnknownRegion();

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

  RenderWithAllMasks(
      this, compositor, aClipRect,
      [&](EffectChain& effectChain, const gfx::IntRect& clipRect) {
        mBuffer->SetPaintWillResample(MayResample());

        mBuffer->Composite(compositor, this, effectChain, GetEffectiveOpacity(),
                           GetEffectiveTransform(), GetSamplingFilter(),
                           clipRect, &visibleRegion, aGeometry);
      });

  mBuffer->BumpFlashCounter();

  compositor->MakeCurrent();
}

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

  return nullptr;
}

void PaintedLayerComposite::CleanupResources() {
  if (mBuffer) {
    mBuffer->Detach(this);
  }
  mBuffer = nullptr;
}

bool PaintedLayerComposite::IsOpaque() {
  if (!mBuffer || !mBuffer->IsAttached()) {
    return false;
  }
  return PaintedLayer::IsOpaque();
}

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

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

const gfx::TiledIntRegion& PaintedLayerComposite::GetInvalidRegion() {
  if (mBuffer) {
    nsIntRegion region = mInvalidRegion.GetRegion();
    mBuffer->AddAnimationInvalidation(region);
  }
  return mInvalidRegion;
}

}  // namespace layers
}  // namespace mozilla