Make copySurface work for texture dsts, return a bool, & add unit test.

src/gpu/GrDrawTarget.cpp

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDrawTarget.h"
 
@@ skipping 388 matching lines @@
 void GrDrawTarget::discard(GrRenderTarget* renderTarget) {
     if (this->caps()->discardRenderTargetSupport()) {
         GrBatch* batch = new GrDiscardBatch(renderTarget);
         this->recordBatch(batch);
         batch->unref();
     }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
-void GrDrawTarget::copySurface(GrSurface* dst,
+bool GrDrawTarget::copySurface(GrSurface* dst,
                                GrSurface* src,
                                const SkIRect& srcRect,
                                const SkIPoint& dstPoint) {
     GrBatch* batch = GrCopySurfaceBatch::Create(dst, src, srcRect, dstPoint);
-    if (batch) {
+    if (!batch) {
+        return false;
+    }
 #ifdef ENABLE_MDB
-        this->addDependency(src);
+    this->addDependency(src);
 #endif
 
-        this->recordBatch(batch);
-        batch->unref();
-    }
+    this->recordBatch(batch);
+    batch->unref();
+    return true;
 }
 
 template <class Left, class Right> static bool intersect(const Left& a, const Right& b) {
     SkASSERT(a.fLeft <= a.fRight && a.fTop <= a.fBottom &&
              b.fLeft <= b.fRight && b.fTop <= b.fBottom);
     return a.fLeft < b.fRight && b.fLeft < a.fRight && a.fTop < b.fBottom && b.fTop < a.fBottom;
 }
 
 void GrDrawTarget::recordBatch(GrBatch* batch) {
     // A closed drawTarget should never receive new/more batches
@@ skipping 98 matching lines @@
     }
 
     return true;
 }
 
 void GrDrawTarget::clearStencilClip(const SkIRect& rect, bool insideClip, GrRenderTarget* rt) {
     GrBatch* batch = new GrClearStencilClipBatch(rect, insideClip, rt);
     this->recordBatch(batch);
     batch->unref();
 }