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       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2             :  * This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : #ifndef GFX_CLIENTCANVASLAYER_H
       7             : #define GFX_CLIENTCANVASLAYER_H
       8             : 
       9             : #include "CanvasClient.h"               // for CanvasClient, etc
      10             : #include "ClientLayerManager.h"         // for ClientLayerManager, etc
      11             : #include "Layers.h"                     // for CanvasLayer, etc
      12             : #include "mozilla/Attributes.h"         // for override
      13             : #include "mozilla/layers/LayersMessages.h"  // for CanvasLayerAttributes, etc
      14             : #include "mozilla/mozalloc.h"           // for operator delete
      15             : #include "nsDebug.h"                    // for NS_ASSERTION
      16             : #include "nsISupportsImpl.h"            // for MOZ_COUNT_CTOR, etc
      17             : #include "ShareableCanvasLayer.h"
      18             : 
      19             : namespace mozilla {
      20             : namespace layers {
      21             : 
      22             : class CompositableClient;
      23             : class ShadowableLayer;
      24             : 
      25             : class ClientCanvasLayer : public ShareableCanvasLayer,
      26             :                           public ClientLayer
      27             : {
      28             : public:
      29           0 :   explicit ClientCanvasLayer(ClientLayerManager* aLayerManager) :
      30           0 :     ShareableCanvasLayer(aLayerManager, static_cast<ClientLayer*>(this))
      31             :   {
      32           0 :     MOZ_COUNT_CTOR(ClientCanvasLayer);
      33           0 :   }
      34             : 
      35             : protected:
      36             :   virtual ~ClientCanvasLayer();
      37             : 
      38             : public:
      39           0 :   virtual void SetVisibleRegion(const LayerIntRegion& aRegion) override
      40             :   {
      41           0 :     NS_ASSERTION(ClientManager()->InConstruction(),
      42             :                  "Can only set properties in construction phase");
      43           0 :     CanvasLayer::SetVisibleRegion(aRegion);
      44           0 :   }
      45             : 
      46             :   virtual void RenderLayer() override;
      47             : 
      48           0 :   virtual void ClearCachedResources() override
      49             :   {
      50           0 :     if (mBufferProvider) {
      51           0 :       mBufferProvider->ClearCachedResources();
      52             :     }
      53           0 :     if (mCanvasClient) {
      54           0 :       mCanvasClient->Clear();
      55             :     }
      56           0 :   }
      57             : 
      58           0 :   virtual void HandleMemoryPressure() override
      59             :   {
      60           0 :     if (mBufferProvider) {
      61           0 :       mBufferProvider->ClearCachedResources();
      62             :     }
      63           0 :     if (mCanvasClient) {
      64           0 :       mCanvasClient->HandleMemoryPressure();
      65             :     }
      66           0 :   }
      67             : 
      68           0 :   virtual void FillSpecificAttributes(SpecificLayerAttributes& aAttrs) override
      69             :   {
      70           0 :     aAttrs = CanvasLayerAttributes(mSamplingFilter, mBounds);
      71           0 :   }
      72             : 
      73           0 :   virtual Layer* AsLayer()  override { return this; }
      74           0 :   virtual ShadowableLayer* AsShadowableLayer()  override { return this; }
      75             : 
      76           0 :   virtual void Disconnect() override
      77             :   {
      78           0 :     if (mBufferProvider) {
      79           0 :       mBufferProvider->ClearCachedResources();
      80             :     }
      81           0 :     mCanvasClient = nullptr;
      82           0 :   }
      83             : 
      84           0 :   virtual CompositableForwarder* GetForwarder() override
      85             :   {
      86           0 :     return mManager->AsShadowForwarder();
      87             :   }
      88             : 
      89           0 :   virtual CompositableClient* GetCompositableClient() override
      90             :   {
      91           0 :     return mCanvasClient;
      92             :   }
      93             : 
      94           0 :   virtual void AttachCompositable() override
      95             :   {
      96           0 :     if (HasShadow()) {
      97           0 :       if (mAsyncRenderer) {
      98           0 :         static_cast<CanvasClientBridge*>(mCanvasClient.get())->SetLayer(this);
      99             :       } else {
     100           0 :         mCanvasClient->Connect();
     101           0 :         ClientManager()->AsShadowForwarder()->Attach(mCanvasClient, this);
     102             :       }
     103             :     }
     104           0 :   }
     105             : 
     106             : protected:
     107           0 :   ClientLayerManager* ClientManager()
     108             :   {
     109           0 :     return static_cast<ClientLayerManager*>(mManager);
     110             :   }
     111             : };
     112             : 
     113             : } // namespace layers
     114             : } // namespace mozilla
     115             : 
     116             : #endif