gecko/gfx/layers/basic/BasicColorLayer.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * 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 "mozilla/layers/PLayersParent.h"
#include "BasicLayersImpl.h"

using namespace mozilla::gfx;

namespace mozilla {
namespace layers {

class BasicColorLayer : public ColorLayer, public BasicImplData {
public:
  BasicColorLayer(BasicLayerManager* aLayerManager) :
    ColorLayer(aLayerManager, static_cast<BasicImplData*>(this))
  {
    MOZ_COUNT_CTOR(BasicColorLayer);
  }
  virtual ~BasicColorLayer()
  {
    MOZ_COUNT_DTOR(BasicColorLayer);
  }

  virtual void SetVisibleRegion(const nsIntRegion& aRegion)
  {
    NS_ASSERTION(BasicManager()->InConstruction(),
                 "Can only set properties in construction phase");
    ColorLayer::SetVisibleRegion(aRegion);
  }

  virtual void Paint(gfxContext* aContext, Layer* aMaskLayer)
  {
    if (IsHidden())
      return;
    AutoSetOperator setOperator(aContext, GetOperator());
    PaintColorTo(mColor, GetEffectiveOpacity(), aContext, aMaskLayer);
  }

  static void PaintColorTo(gfxRGBA aColor, float aOpacity,
                           gfxContext* aContext,
                           Layer* aMaskLayer);

protected:
  BasicLayerManager* BasicManager()
  {
    return static_cast<BasicLayerManager*>(mManager);
  }
};

/*static*/ void
BasicColorLayer::PaintColorTo(gfxRGBA aColor, float aOpacity,
                              gfxContext* aContext,
                              Layer* aMaskLayer)
{
  aContext->SetColor(aColor);
  PaintWithMask(aContext, aOpacity, aMaskLayer);
}

class BasicShadowableColorLayer : public BasicColorLayer,
                                  public BasicShadowableLayer
{
public:
  BasicShadowableColorLayer(BasicShadowLayerManager* aManager) :
    BasicColorLayer(aManager)
  {
    MOZ_COUNT_CTOR(BasicShadowableColorLayer);
  }
  virtual ~BasicShadowableColorLayer()
  {
    MOZ_COUNT_DTOR(BasicShadowableColorLayer);
  }

  virtual void FillSpecificAttributes(SpecificLayerAttributes& aAttrs)
  {
    aAttrs = ColorLayerAttributes(GetColor());
  }

  virtual Layer* AsLayer() { return this; }
  virtual ShadowableLayer* AsShadowableLayer() { return this; }

  virtual void Disconnect()
  {
    BasicShadowableLayer::Disconnect();
  }

  virtual void Paint(gfxContext* aContext, Layer* aMaskLayer);
};

void
BasicShadowableColorLayer::Paint(gfxContext* aContext, Layer* aMaskLayer)
{
  BasicColorLayer::Paint(aContext, aMaskLayer);

  if (!HasShadow()) {
    return;
  }

  if (aMaskLayer) {
    static_cast<BasicImplData*>(aMaskLayer->ImplData())
      ->Paint(aContext, nullptr);
  }
}

class BasicShadowColorLayer : public ShadowColorLayer,
                              public BasicImplData
{
public:
  BasicShadowColorLayer(BasicShadowLayerManager* aLayerManager) :
    ShadowColorLayer(aLayerManager, static_cast<BasicImplData*>(this))
  {
    MOZ_COUNT_CTOR(BasicShadowColorLayer);
  }
  virtual ~BasicShadowColorLayer()
  {
    MOZ_COUNT_DTOR(BasicShadowColorLayer);
  }

  virtual void Paint(gfxContext* aContext, Layer* aMaskLayer)
  {
    AutoSetOperator setOperator(aContext, GetOperator());
    BasicColorLayer::PaintColorTo(mColor, GetEffectiveOpacity(),
                                  aContext, aMaskLayer);
  }
};

already_AddRefed<ColorLayer>
BasicLayerManager::CreateColorLayer()
{
  NS_ASSERTION(InConstruction(), "Only allowed in construction phase");
  nsRefPtr<ColorLayer> layer = new BasicColorLayer(this);
  return layer.forget();
}

already_AddRefed<ColorLayer>
BasicShadowLayerManager::CreateColorLayer()
{
  NS_ASSERTION(InConstruction(), "Only allowed in construction phase");
  nsRefPtr<BasicShadowableColorLayer> layer =
    new BasicShadowableColorLayer(this);
  MAYBE_CREATE_SHADOW(Color);
  return layer.forget();
}

already_AddRefed<ShadowColorLayer>
BasicShadowLayerManager::CreateShadowColorLayer()
{
  NS_ASSERTION(InConstruction(), "Only allowed in construction phase");
  nsRefPtr<ShadowColorLayer> layer = new BasicShadowColorLayer(this);
  return layer.forget();
}

}
}