choose better mip level

src/core/SkMipMap.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 "SkMipMap.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 233 matching lines @@
 
 bool SkMipMap::extractLevel(SkScalar scale, Level* levelPtr) const {
     if (NULL == fLevels) {
         return false;
     }
 
     if (scale >= SK_Scalar1) {
         return false;
     }
 
-    int level = compute_level(scale) >> 16;
+    int level = SkFixedRoundToInt(compute_level(scale));
     SkASSERT(level >= 0);
     if (level <= 0) {
         return false;
     }
 
     if (level > fCount) {
         level = fCount;
     }
     if (levelPtr) {
         *levelPtr = fLevels[level - 1];
     }
     return true;
 }