Initial work to get ETC1 data up to the GPU

gm/etc1bitmap.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 "gm.h"
 #include "SkCanvas.h"
+#include "SkData.h"
+#include "SkDecodingImageGenerator.h"
 #include "SkImageDecoder.h"
 #include "SkOSFile.h"
 
 namespace skiagm {
 
 /**
  *  Test decoding an image from a PKM file and then
  *  from compressed ETC1 data.
  */
 class ETC1BitmapGM : public GM {
 public:
     ETC1BitmapGM() { }
     virtual ~ETC1BitmapGM() { }
 
 protected:
     virtual SkString onShortName() SK_OVERRIDE {
         return SkString("etc1bitmap");
     }
 
     virtual SkISize onISize() SK_OVERRIDE {
         return make_isize(512, 512);
     }
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
 
         SkBitmap bm;
         SkString filename = SkOSPath::SkPathJoin(
                 INHERITED::gResourcePath.c_str(), "mandrill_512.pkm");
-        if (!SkImageDecoder::DecodeFile(filename.c_str(), &bm,
-                                        SkBitmap::kARGB_8888_Config,
-                                        SkImageDecoder::kDecodePixels_Mode)) {
-            SkDebugf("Could not decode the file. Did you forget to set the "
-                     "resourcePath?\n");
+
+        SkData *fileData = SkData::NewFromFileName(filename.c_str());
+        if (NULL == fileData) {
+            SkDebugf("Could not open the file. Did you forget to set the resourcePath?\n");
             return;
         }
+
+        if (!SkInstallDiscardablePixelRef(
+                SkDecodingImageGenerator::Create(
+                    fileData, SkDecodingImageGenerator::Options()), &bm)) {
+            SkDebugf("Could not install discardable pixel ref.\n");
+            return;
+        }
+
         canvas->drawBitmap(bm, 0, 0);
     }
 
 private:
     typedef GM INHERITED;
 };
 
 }  // namespace skiagm
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM( return SkNEW(skiagm::ETC1BitmapGM); )