change offset to xy for pixelref subsetting

src/gpu/SkGpuDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGpuDevice.h"
 
 #include "effects/GrBicubicEffect.h"
@@ skipping 201 matching lines @@
     // busting chrome (for a currently unknown reason).
     GrSurface* surface = fRenderTarget->asTexture();
     if (NULL == surface) {
         surface = fRenderTarget;
     }
 
     SkImageInfo info;
     surface->asImageInfo(&info);
     SkPixelRef* pr = SkNEW_ARGS(SkGrPixelRef, (info, surface, cached));
 
-    this->setPixelRef(pr, 0)->unref();
+    this->setPixelRef(pr)->unref();
 }
 
 SkGpuDevice::SkGpuDevice(GrContext* context,
                          SkBitmap::Config config,
                          int width,
                          int height,
                          int sampleCount)
     : SkBitmapDevice(make_bitmap(config, width, height, false /*isOpaque*/))
 {
     fDrawProcs = NULL;
@@ skipping 26 matching lines @@
     SkAutoTUnref<GrTexture> texture(fContext->createUncachedTexture(desc, NULL, 0));
 
     if (NULL != texture) {
         fRenderTarget = texture->asRenderTarget();
         fRenderTarget->ref();
 
         SkASSERT(NULL != fRenderTarget);
 
         // wrap the bitmap with a pixelref to expose our texture
         SkGrPixelRef* pr = SkNEW_ARGS(SkGrPixelRef, (info, texture));
-        this->setPixelRef(pr, 0)->unref();
+        this->setPixelRef(pr)->unref();
     } else {
         GrPrintf("--- failed to create gpu-offscreen [%d %d]\n",
                  width, height);
         SkASSERT(false);
     }
 }
 
 SkGpuDevice::~SkGpuDevice() {
     if (fDrawProcs) {
         delete fDrawProcs;
@@ skipping 1639 matching lines @@
                          GrTexture* texture,
                          bool needClear)
     : SkBitmapDevice(make_bitmap(context, texture->asRenderTarget())) {
 
     SkASSERT(texture && texture->asRenderTarget());
     // This constructor is called from onCreateCompatibleDevice. It has locked the RT in the texture
     // cache. We pass true for the third argument so that it will get unlocked.
     this->initFromRenderTarget(context, texture->asRenderTarget(), true);
     fNeedClear = needClear;
 }