Add class GrGLTextureRenderTarget for GL texture/rendertarget objects

include/gpu/GrRenderTarget.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrRenderTarget_DEFINED
 #define GrRenderTarget_DEFINED
 
 #include "GrSurface.h"
 #include "SkRect.h"
 
 class GrStencilBuffer;
-class GrTexture;
 
 /**
  * GrRenderTarget represents a 2D buffer of pixels that can be rendered to.
  * A context's render target is set by setRenderTarget(). Render targets are
- * created by a createTexture with the kRenderTarget_TextureFlag flag.
+ * created by a createTexture with the kRenderTarget_SurfaceFlag flag.
  * Additionally, GrContext provides methods for creating GrRenderTargets
  * that wrap externally created render targets.
  */
-class GrRenderTarget : public GrSurface {
+class GrRenderTarget : virtual public GrSurface {

[brucedawson, 2015/07/15 17:27:33]

Note that the use of virtual here makes the call to the INHERITED constructor a
NOP. See crbug.com/510497

 public:
     SK_DECLARE_INST_COUNT(GrRenderTarget)
 
-    // GrResource overrides
-    virtual size_t gpuMemorySize() const SK_OVERRIDE;
-
     // GrSurface overrides
-    /**
-     * @return the texture associated with the render target, may be NULL.
-     */
-    virtual GrTexture* asTexture() SK_OVERRIDE { return fTexture; }
-    virtual const GrTexture* asTexture() const SK_OVERRIDE { return fTexture; }
-
-    /**
-     * @return this render target.
-     */
     virtual GrRenderTarget* asRenderTarget() SK_OVERRIDE { return this; }
-    virtual const GrRenderTarget* asRenderTarget() const  SK_OVERRIDE {
-        return this;
-    }
+    virtual const GrRenderTarget* asRenderTarget() const  SK_OVERRIDE { return this; }
 
     // GrRenderTarget
     /**
      * If this RT is multisampled, this is the multisample buffer
      * @return the 3D API's handle to this object (e.g. FBO ID in OpenGL)
      */
     virtual GrBackendObject getRenderTargetHandle() const = 0;
 
     /**
      * If this RT is multisampled, this is the buffer it is resolved to.
@@ skipping 72 matching lines @@
 
     /**
      * GrStencilBuffer is not part of the public API.
      */
     GrStencilBuffer* getStencilBuffer() const { return fStencilBuffer; }
     void setStencilBuffer(GrStencilBuffer* stencilBuffer);
 
 protected:
     GrRenderTarget(GrGpu* gpu,
                    bool isWrapped,
-                   GrTexture* texture,
                    const GrSurfaceDesc& desc)
         : INHERITED(gpu, isWrapped, desc)
-        , fStencilBuffer(NULL)
-        , fTexture(texture) {
+        , fStencilBuffer(NULL) {
         fResolveRect.setLargestInverted();
     }
 
     // override of GrResource
     virtual void onAbandon() SK_OVERRIDE;
     virtual void onRelease() SK_OVERRIDE;
 
 private:
-    friend class GrTexture;
-    // called by ~GrTexture to remove the non-ref'ed back ptr.
-    void owningTextureDestroyed() {
-        SkASSERT(fTexture);
-        fTexture = NULL;
-    }
-
     GrStencilBuffer*  fStencilBuffer;
-    GrTexture*        fTexture; // not ref'ed
 
     SkIRect           fResolveRect;
 
     typedef GrSurface INHERITED;
 };
 
 #endif