Add SkSurface factory for wrapping an FBO in SkSurface

src/image/SkSurface_Gpu.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkSurface_Gpu.h"
 
 #include "SkCanvas.h"
@@ skipping 99 matching lines @@
 SkSurface* SkSurface::NewRenderTarget(GrContext* ctx, Budgeted budgeted, const SkImageInfo& info,
                                       int sampleCount, const SkSurfaceProps* props) {
     SkAutoTUnref<SkGpuDevice> device(SkGpuDevice::Create(ctx, budgeted, info, sampleCount, props,
                                                          SkGpuDevice::kClear_InitContents));
     if (!device) {
         return NULL;
     }
     return SkNEW_ARGS(SkSurface_Gpu, (device));
 }
 
-SkSurface* SkSurface::NewWrappedRenderTarget(GrContext* context, GrBackendTextureDesc desc,
-                                             const SkSurfaceProps* props) {
+SkSurface* SkSurface::NewFromBackendTexture(GrContext* context, const GrBackendTextureDesc& desc,
+                                            const SkSurfaceProps* props) {
     if (NULL == context) {
         return NULL;
     }
     if (!SkToBool(desc.fFlags & kRenderTarget_GrBackendTextureFlag)) {
         return NULL;
     }
     SkAutoTUnref<GrSurface> surface(context->textureProvider()->wrapBackendTexture(desc,
                                     kBorrow_GrWrapOwnership));
     if (!surface) {
         return NULL;
     }
     SkAutoTUnref<SkGpuDevice> device(SkGpuDevice::Create(surface->asRenderTarget(), props,
                                                          SkGpuDevice::kUninit_InitContents));
     if (!device) {
         return NULL;
     }
     return SkNEW_ARGS(SkSurface_Gpu, (device));
 }
 
+SkSurface* SkSurface::NewFromBackendRenderTarget(GrContext* context,
+                                                 const GrBackendRenderTargetDesc& desc,
+                                                 const SkSurfaceProps* props) {
+    if (NULL == context) {
+        return NULL;
+    }
+    SkAutoTUnref<GrRenderTarget> rt(context->textureProvider()->wrapBackendRenderTarget(desc));
+    if (!rt) {
+        return NULL;
+    }
+    SkAutoTUnref<SkGpuDevice> device(SkGpuDevice::Create(rt, props,
+                                                         SkGpuDevice::kUninit_InitContents));
+    if (!device) {
+        return NULL;
+    }
+    return SkNEW_ARGS(SkSurface_Gpu, (device));
+}
+
 #endif