hide SkBitmap::setConfig

tools/skpdiff/SkDifferentPixelsMetric_cpu.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 "SkDifferentPixelsMetric.h"
 
 #include "SkBitmap.h"
@@ skipping 12 matching lines @@
         baseline->width() <= 0 || baseline->height() <= 0 ||
         baseline->config() != test->config()) {
         return false;
     }
 
     int width = baseline->width();
     int height = baseline->height();
 
     // Prepare the POI alpha mask if needed
     if (computeMask) {
-        result->poiAlphaMask.setConfig(SkBitmap::kA8_Config, width, height);
-        result->poiAlphaMask.allocPixels();
-        result->poiAlphaMask.lockPixels();
+        result->poiAlphaMask.allocPixels(SkImageInfo::MakeA8(width, height));
         result->poiAlphaMask.eraseARGB(SK_AlphaOPAQUE, 0, 0, 0);
     }
 
     // Prepare the pixels for comparison
     result->poiCount = 0;
     baseline->lockPixels();
     test->lockPixels();
     for (int y = 0; y < height; y++) {
         // Grab a row from each image for easy comparison
         unsigned char* baselineRow = (unsigned char*)baseline->getAddr(0, y);
@@ skipping 14 matching lines @@
     if (computeMask) {
         result->poiAlphaMask.unlockPixels();
     }
 
     // Calculates the percentage of identical pixels
     result->result = 1.0 - ((double)result->poiCount / (width * height));
     result->timeElapsed = get_seconds() - startTime;
 
     return true;
 }