use SkColorType instead of SkBitmap::Config in samplecode

samplecode/SampleUnpremul.cpp

 /*
  * Copyright 2013 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 "SampleCode.h"
 #include "SkBlurMask.h"
 #include "SkBlurDrawLooper.h"
@@ skipping 107 matching lines @@
         canvas->drawText(header.c_str(), header.size(), 0, height, paint);
 
         // Now draw the image itself.
         canvas->translate(height * 2, height * 2);
         if (!fPremul) {
             // A premultiplied bitmap cannot currently be drawn.
             SkAutoLockPixels alp(fBitmap);
             // Copy it to a bitmap which can be drawn, converting
             // to premultiplied:
             SkBitmap bm;
-            bm.setConfig(SkBitmap::kARGB_8888_Config, fBitmap.width(),
-                         fBitmap.height());
-            SkASSERT(fBitmap.config() == SkBitmap::kARGB_8888_Config);
-            if (!bm.allocPixels()) {
+            if (!bm.allocN32Pixels(fBitmap.width(), fBitmap.height())) {
                 SkString errMsg("allocPixels failed");
                 canvas->drawText(errMsg.c_str(), errMsg.size(), 0, height, paint);
                 return;
             }
             for (int i = 0; i < fBitmap.width(); ++i) {
                 for (int j = 0; j < fBitmap.height(); ++j) {
                     *bm.getAddr32(i, j) = premultiply_unpmcolor(*fBitmap.getAddr32(i, j));
                 }
             }
             canvas->drawBitmap(bm, 0, 0);
@@ skipping 56 matching lines @@
 
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() {
     return new UnpremulView(skiagm::GM::GetResourcePath());
 }
 static SkViewRegister reg(MyFactory);