change offset to xy for pixelref subsetting

include/core/SkBitmapDevice.h

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBitmapDevice_DEFINED
 #define SkBitmapDevice_DEFINED
@@ skipping 181 matching lines @@
 
     /** Update as needed the pixel value in the bitmap, so that the caller can
         access the pixels directly. Note: only the pixels field should be
         altered. The config/width/height/rowbytes must remain unchanged.
         @return the device contents as a bitmap
     */
     virtual const SkBitmap& onAccessBitmap() SK_OVERRIDE;
 
     SkPixelRef* getPixelRef() const { return fBitmap.pixelRef(); }
     // just for subclasses, to assign a custom pixelref
-    SkPixelRef* setPixelRef(SkPixelRef* pr, size_t offset) {
-        fBitmap.setPixelRef(pr, offset);
+    SkPixelRef* setPixelRef(SkPixelRef* pr) {
+        fBitmap.setPixelRef(pr);
         return pr;
     }
 
     /**
      * Implements readPixels API. The caller will ensure that:
      *  1. bitmap has pixel config kARGB_8888_Config.
      *  2. bitmap has pixels.
      *  3. The rectangle (x, y, x + bitmap->width(), y + bitmap->height()) is
      *     contained in the device bounds.
      */
@@ skipping 62 matching lines @@
     /** Causes any deferred drawing to the device to be completed.
      */
     virtual void flush() SK_OVERRIDE {}
 
     SkBitmap    fBitmap;
 
     typedef SkBaseDevice INHERITED;
 };
 
 #endif // SkBitmapDevice_DEFINED