gecko-dev/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 "BasicLayersImpl.h"            // for FillWithMask, etc
#include "Layers.h"                     // for ColorLayer, etc
#include "BasicImplData.h"              // for BasicImplData
#include "BasicLayers.h"                // for BasicLayerManager
#include "gfxContext.h"                 // for gfxContext, etc
#include "gfxRect.h"                    // for gfxRect
#include "gfx2DGlue.h"
#include "mozilla/mozalloc.h"           // for operator new
#include "nsAutoPtr.h"                  // for nsRefPtr
#include "nsCOMPtr.h"                   // for already_AddRefed
#include "nsDebug.h"                    // for NS_ASSERTION
#include "nsISupportsImpl.h"            // for Layer::AddRef, etc
#include "nsRect.h"                     // for nsIntRect
#include "nsRegion.h"                   // for nsIntRegion

using namespace mozilla::gfx;

namespace mozilla {
namespace layers {

class BasicColorLayer : public ColorLayer, public BasicImplData {
public:
  BasicColorLayer(BasicLayerManager* aLayerManager) :
    ColorLayer(aLayerManager,
               static_cast<BasicImplData*>(MOZ_THIS_IN_INITIALIZER_LIST()))
  {
    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(DrawTarget* aTarget, SourceSurface* aMaskSurface)
  {
    if (IsHidden()) {
      return;
    }

    CompositionOp op = GetEffectiveOperator(this);

    DrawOptions opts = DrawOptions();
    opts.mCompositionOp = op;
    ColorPattern pattern(ToColor(mColor));
    aTarget->MaskSurface(pattern,
                         aMaskSurface,
                         ToIntRect(GetBounds()).TopLeft(),
                         opts);
  }

  virtual void DeprecatedPaint(gfxContext* aContext, Layer* aMaskLayer)
  {
    if (IsHidden()) {
      return;
    }
    gfxContextAutoSaveRestore contextSR(aContext);
    gfxContext::GraphicsOperator mixBlendMode = DeprecatedGetEffectiveMixBlendMode();
    AutoSetOperator setOptimizedOperator(aContext,
                                         mixBlendMode != gfxContext::OPERATOR_OVER ?
                                           mixBlendMode :
                                           DeprecatedGetOperator());

    aContext->SetColor(mColor);

    nsIntRect bounds = GetBounds();
    aContext->NewPath();
    aContext->SnappedRectangle(gfxRect(bounds.x, bounds.y, bounds.width, bounds.height));

    FillWithMask(aContext, GetEffectiveOpacity(), aMaskLayer);
  }

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

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

}
}