gecko-dev/gfx/layers/client/ClientThebesLayer.h

/* -*- 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/. */

#ifndef GFX_CLIENTTHEBESLAYER_H
#define GFX_CLIENTTHEBESLAYER_H

#include "ClientLayerManager.h"
#include "ThebesLayerBuffer.h"
#include "mozilla/layers/ContentClient.h"

namespace mozilla {
namespace layers {

class ClientThebesLayer : public ThebesLayer, 
                          public ClientLayer {
public:
  typedef ThebesLayerBuffer::PaintState PaintState;
  typedef ThebesLayerBuffer::ContentType ContentType;

  ClientThebesLayer(ClientLayerManager* aLayerManager) :
    ThebesLayer(aLayerManager, static_cast<ClientLayer*>(this)),
    mContentClient(nullptr)
  {
    MOZ_COUNT_CTOR(ClientThebesLayer);
  }
  virtual ~ClientThebesLayer()
  {
    MOZ_COUNT_DTOR(ClientThebesLayer);
  }

  virtual void SetVisibleRegion(const nsIntRegion& aRegion)
  {
    NS_ASSERTION(ClientManager()->InConstruction(),
                 "Can only set properties in construction phase");
    ThebesLayer::SetVisibleRegion(aRegion);
  }
  virtual void InvalidateRegion(const nsIntRegion& aRegion)
  {
    NS_ASSERTION(ClientManager()->InConstruction(),
                 "Can only set properties in construction phase");
    mInvalidRegion.Or(mInvalidRegion, aRegion);
    mInvalidRegion.SimplifyOutward(10);
    mValidRegion.Sub(mValidRegion, mInvalidRegion);
  }

  virtual void RenderLayer();

  virtual void ClearCachedResources()
  {
    if (mContentClient) {
      mContentClient->Clear();
    }
    mValidRegion.SetEmpty();
    DestroyBackBuffer();
  }
  
  virtual void FillSpecificAttributes(SpecificLayerAttributes& aAttrs)
  {
    aAttrs = ThebesLayerAttributes(GetValidRegion());
  }
  
  ClientLayerManager* ClientManager()
  {
    return static_cast<ClientLayerManager*>(mManager);
  }
  
  virtual Layer* AsLayer() { return this; }
  virtual ShadowableLayer* AsShadowableLayer() { return this; }

  virtual CompositableClient* GetCompositableClient() MOZ_OVERRIDE
  {
    return mContentClient;
  }

  virtual void Disconnect()
  {
    mContentClient = nullptr;
    ClientLayer::Disconnect();
  }

protected:
  void
  PaintBuffer(gfxContext* aContext,
              const nsIntRegion& aRegionToDraw,
              const nsIntRegion& aExtendedRegionToDraw,
              const nsIntRegion& aRegionToInvalidate,
              bool aDidSelfCopy);
  
  void PaintThebes();
  
  void DestroyBackBuffer()
  {
    mContentClient = nullptr;
  }

  RefPtr<ContentClient> mContentClient;
};

}
}

#endif