Bug 620665 - Part 1: Expose backend type on ImageContainers. r=roc a=blocking-beta9

gfx/layers/ImageLayers.h

@@ -195,6 +195,13 @@ public:
    */
   virtual void SetScaleHint(const gfxIntSize& /* aScaleHint */) { }
 
+  /**
+   * Get the layer manager type this image container was created with,
+   * presumably its users might want to do something special if types do not
+   * match.
+   */
+  virtual LayerManager::LayersBackend GetBackendType() = 0;
+
 protected:
   LayerManager* mManager;
 

gfx/layers/basic/BasicImages.cpp

@@ -305,6 +305,7 @@ public:
   virtual PRBool SetLayerManager(LayerManager *aManager);
   virtual void SetScaleHint(const gfxIntSize& aScaleHint);
   void SetOffscreenFormat(gfxImageFormat aFormat) { mOffscreenFormat = aFormat; }
+  virtual LayerManager::LayersBackend GetBackendType() { return LayerManager::LAYERS_BASIC; }
 
 protected:
   Monitor mMonitor;

gfx/layers/d3d10/ImageLayerD3D10.h

@@ -65,6 +65,8 @@ public:
 
   virtual PRBool SetLayerManager(LayerManager *aManager);
 
+  virtual LayerManager::LayersBackend GetBackendType() { return LayerManager::LAYERS_D3D10; }
+
 private:
   typedef mozilla::Mutex Mutex;
 

gfx/layers/d3d9/ImageLayerD3D9.h

@@ -65,6 +65,8 @@ public:
 
   virtual PRBool SetLayerManager(LayerManager *aManager);
 
+  virtual LayerManager::LayersBackend GetBackendType() { return LayerManager::LAYERS_D3D9; }
+
 private:
   typedef mozilla::Mutex Mutex;
 

gfx/layers/opengl/ImageLayerOGL.h

@@ -156,6 +156,8 @@ public:
 
   virtual PRBool SetLayerManager(LayerManager *aManager);
 
+  virtual LayerManager::LayersBackend GetBackendType() { return LayerManager::LAYERS_OPENGL; }
+
 private:
   typedef mozilla::Mutex Mutex;