Add wrapBackendTextureAsRenderTarget API

src/gpu/GrGpu.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 GrGpu_DEFINED
 #define GrGpu_DEFINED
 
@@ skipping 79 matching lines @@
      * @param rowBytes    the number of bytes between consecutive rows. Zero
      *                    means rows are tightly packed. This field is ignored
      *                    for compressed formats.
      *
      * @return    The texture object if successful, otherwise nullptr.
      */
     GrTexture* createTexture(const GrSurfaceDesc& desc, bool budgeted,
                              const void* srcData, size_t rowBytes);
 
     /**
-     * Implements GrContext::wrapBackendTexture
+     * Implements GrTextureProvider::wrapBackendTexture
      */
     GrTexture* wrapBackendTexture(const GrBackendTextureDesc&, GrWrapOwnership);
 
     /**
-     * Implements GrContext::wrapBackendTexture
+     * Implements GrTextureProvider::wrapBackendTexture
      */
     GrRenderTarget* wrapBackendRenderTarget(const GrBackendRenderTargetDesc&, GrWrapOwnership);
 
     /**
+     * Implements GrTextureProvider::wrapBackendTextureAsRenderTarget
+     */
+    GrRenderTarget* wrapBackendTextureAsRenderTarget(const GrBackendTextureDesc&, GrWrapOwnership);
+
+    /**
      * Creates a vertex buffer.
      *
      * @param size    size in bytes of the vertex buffer
      * @param dynamic hints whether the data will be frequently changed
      *                by either GrVertexBuffer::map() or
      *                GrVertexBuffer::updateData().
      *
      * @return    The vertex buffer if successful, otherwise nullptr.
      */
     GrVertexBuffer* createVertexBuffer(size_t size, bool dynamic);
@@ skipping 385 matching lines @@
     // onCreateTexture/CompressedTexture are called.
     virtual GrTexture* onCreateTexture(const GrSurfaceDesc& desc,
                                        GrGpuResource::LifeCycle lifeCycle,
                                        const void* srcData, size_t rowBytes) = 0;
     virtual GrTexture* onCreateCompressedTexture(const GrSurfaceDesc& desc,
                                                  GrGpuResource::LifeCycle lifeCycle,
                                                  const void* srcData) = 0;
     virtual GrTexture* onWrapBackendTexture(const GrBackendTextureDesc&, GrWrapOwnership) = 0;
     virtual GrRenderTarget* onWrapBackendRenderTarget(const GrBackendRenderTargetDesc&,
                                                       GrWrapOwnership) = 0;
+    virtual GrRenderTarget* onWrapBackendTextureAsRenderTarget(const GrBackendTextureDesc&,
+                                                               GrWrapOwnership) = 0;
     virtual GrVertexBuffer* onCreateVertexBuffer(size_t size, bool dynamic) = 0;
     virtual GrIndexBuffer* onCreateIndexBuffer(size_t size, bool dynamic) = 0;
     virtual GrTransferBuffer* onCreateTransferBuffer(size_t size, TransferType type) = 0;
 
     // overridden by backend-specific derived class to perform the clear.
     virtual void onClear(GrRenderTarget*, const SkIRect& rect, GrColor color) = 0;
 
 
     // Overridden by backend specific classes to perform a clear of the stencil clip bits.  This is
     // ONLY used by the the clip target
@@ skipping 50 matching lines @@
     ResetTimestamp                                                      fResetTimestamp;
     uint32_t                                                            fResetBits;
     // The context owns us, not vice-versa, so this ptr is not ref'ed by Gpu.
     GrContext*                                                          fContext;
 
     friend class GrPathRendering;
     typedef SkRefCnt INHERITED;
 };
 
 #endif