change pixel-serializer to support reencoding existing data

tests/KtxTest.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Resources.h"
 #include "SkBitmap.h"
 #include "SkData.h"
+#include "SkImage.h"
 #include "SkImageGenerator.h"
 #include "SkForceLinking.h"
 #include "SkImageDecoder.h"
 #include "SkOSFile.h"
 #include "SkRandom.h"
 #include "SkStream.h"
 #include "Test.h"
 
 __SK_FORCE_IMAGE_DECODER_LINKING;
 
@@ skipping 121 matching lines @@
     SkString pkmFilename = GetResourcePath("mandrill_128.pkm");
 
     // Load PKM file into a bitmap
     SkBitmap etcBitmap;
     SkAutoTUnref<SkData> fileData(SkData::NewFromFileName(pkmFilename.c_str()));
     if (nullptr == fileData) {
         SkDebugf("KtxReexportPKM: can't load test file %s\n", pkmFilename.c_str());
         return;
     }
 
-    bool installDiscardablePixelRefSuccess =
-        SkDEPRECATED_InstallDiscardablePixelRef(fileData, &etcBitmap);
-    REPORTER_ASSERT(reporter, installDiscardablePixelRefSuccess);
+    SkAutoTUnref<SkImage> image(SkImage::NewFromEncoded(fileData));
+    REPORTER_ASSERT(reporter, image.get());
 
-    // Write the bitmap out to a KTX file.
-    SkData *ktxDataPtr = SkImageEncoder::EncodeData(etcBitmap, SkImageEncoder::kKTX_Type, 0);
-    SkAutoDataUnref newKtxData(ktxDataPtr);
-    REPORTER_ASSERT(reporter, ktxDataPtr);
+    SkAutoDataUnref newKtxData(image->encode(SkImageEncoder::kKTX_Type, 0));
+    REPORTER_ASSERT(reporter, newKtxData.get());
 
     // See is this data is identical to data in existing ktx file.
     SkString ktxFilename = GetResourcePath("mandrill_128.ktx");
     SkAutoDataUnref oldKtxData(SkData::NewFromFileName(ktxFilename.c_str()));
     REPORTER_ASSERT(reporter, oldKtxData->equals(newKtxData));
 }