change offset to xy for pixelref subsetting

include/core/SkPixelRef.h

 
 /*
  * Copyright 2008 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPixelRef_DEFINED
@@ skipping 51 matching lines @@
 
     /** Return the pixel memory returned from lockPixels, or null if the
         lockCount is 0.
     */
     void* pixels() const { return fRec.fPixels; }
 
     /** Return the current colorTable (if any) if pixels are locked, or null.
     */
     SkColorTable* colorTable() const { return fRec.fColorTable; }
 
+    size_t rowBytes() const { return fRec.fRowBytes; }
+
     /**
      *  To access the actual pixels of a pixelref, it must be "locked".
      *  Calling lockPixels returns a LockRec struct (on success).
      */
     struct LockRec {
         void*           fPixels;
         SkColorTable*   fColorTable;
         size_t          fRowBytes;
 
         void zero() { sk_bzero(this, sizeof(*this)); }
@@ skipping 274 matching lines @@
 
     // When copying a bitmap to another with the same shape and config, we can safely
     // clone the pixelref generation ID too, which makes them equivalent under caching.
     friend class SkBitmap;  // only for cloneGenID
     void cloneGenID(const SkPixelRef&);
 
     typedef SkFlattenable INHERITED;
 };
 
 #endif