add assert that the pixelref really did success in requestlock

src/core/SkBitmap.cpp

 
 /*
  * 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.
  */
 
 
 #include "SkBitmap.h"
@@ skipping 1343 matching lines @@
     SkASSERT(result);
 
     SkPixelRef* pr = fPixelRef;
     if (NULL == pr) {
         return false;
     }
 
     SkPixelRef::LockRequest req = { fInfo.dimensions(), kNone_SkFilterQuality };
     SkPixelRef::LockResult res;
     if (pr->requestLock(req, &res)) {
+        SkASSERT(res.fPixels);
         // The bitmap may be a subset of the pixelref's dimensions
         SkASSERT(fPixelRefOrigin.x() + fInfo.width()  <= res.fSize.width());
         SkASSERT(fPixelRefOrigin.y() + fInfo.height() <= res.fSize.height());
         const void* addr = (const char*)res.fPixels + SkColorTypeComputeOffset(fInfo.colorType(),
                                                                                fPixelRefOrigin.x(),
                                                                                fPixelRefOrigin.y(),
                                                                                res.fRowBytes);
 
         result->reset(SkPixmap(this->info(), addr, res.fRowBytes, res.fCTable),
                       res.fUnlockProc, res.fUnlockContext);
         return true;
     }
     return false;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifdef SK_DEBUG
 void SkImageInfo::validate() const {
     SkASSERT(fWidth >= 0);
     SkASSERT(fHeight >= 0);
     SkASSERT(SkColorTypeIsValid(fColorType));
     SkASSERT(SkAlphaTypeIsValid(fAlphaType));
 }
 #endif