SkMemoryStream::setData should also set the current offset to 0.

src/core/SkStream.cpp

 
 /*
  * Copyright 2006 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 "SkStream.h"
@@ skipping 346 matching lines @@
 }
 
 SkData* SkMemoryStream::setData(SkData* data) {
     fData->unref();
     if (NULL == data) {
         fData = SkData::NewEmpty();
     } else {
         fData = data;
         fData->ref();
     }
+    fOffset = 0;
     return data;
 }
 
 void SkMemoryStream::skipToAlign4() {
     // cast to remove unary-minus warning
     fOffset += -(int)fOffset & 0x03;
 }
 
 size_t SkMemoryStream::read(void* buffer, size_t size) {
     size_t dataSize = fData->size();
@@ skipping 460 matching lines @@
 
     // If we get here, then our attempt at using mmap failed, so try normal
     // file access.
     SkFILEStream* stream = SkNEW_ARGS(SkFILEStream, (path));
     if (!stream->isValid()) {
         stream->unref();
         stream = NULL;
     }
     return stream;
 }