Add SkAutoPixmapStorage::detachPixelsAsData()

src/core/SkPixmap.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColorPriv.h"
 #include "SkConfig8888.h"
+#include "SkData.h"
 #include "SkMask.h"
 #include "SkPixmap.h"
 #include "SkUtils.h"
 
 void SkAutoPixmapUnlock::reset(const SkPixmap& pm, void (*unlock)(void*), void* ctx) {
     SkASSERT(pm.addr() != nullptr);
 
     this->unlock();
     fPixmap = pm;
     fUnlockProc = unlock;
@@ skipping 245 matching lines @@
     this->reset(info, pixels, rb);
     fStorage = pixels;
     return true;
 }
 
 void SkAutoPixmapStorage::alloc(const SkImageInfo& info) {
     if (!this->tryAlloc(info)) {
         sk_throw();
     }
 }
+
+const SkData* SkAutoPixmapStorage::detachPixelsAsData() {
+    if (!fStorage) {
+        return nullptr;
+    }
+
+    const SkData* data = SkData::NewFromMalloc(fStorage, this->getSafeSize());
+    fStorage = nullptr;
+    this->INHERITED::reset();
+
+    return data;
+}