Relocate anisotropic mipmap logic to SkMipMap::extractLevel()

tests/MipMapTest.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 "SkBitmap.h"
 #include "SkMipMap.h"
 #include "SkRandom.h"
 #include "Test.h"
 
 static void make_bitmap(SkBitmap* bm, SkRandom& rand) {
     // for now, Build needs a min size of 2, otherwise it will return nullptr.
     // should fix that to support 1 X N, where N > 1 to return non-null.
     int w = 2 + rand.nextU() % 1000;
     int h = 2 + rand.nextU() % 1000;
     bm->allocN32Pixels(w, h);
     bm->eraseColor(SK_ColorWHITE);
 }
 
 DEF_TEST(MipMap, reporter) {
     SkBitmap bm;
     SkRandom rand;
 
     for (int i = 0; i < 500; ++i) {
         make_bitmap(&bm, rand);
         SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(bm, nullptr));
 
-        REPORTER_ASSERT(reporter, !mm->extractLevel(SK_Scalar1, nullptr));
-        REPORTER_ASSERT(reporter, !mm->extractLevel(SK_Scalar1 * 2, nullptr));
+        REPORTER_ASSERT(reporter, !mm->extractLevel(SkSize::Make(SK_Scalar1, SK_Scalar1),
+                                                    nullptr));
+        REPORTER_ASSERT(reporter, !mm->extractLevel(SkSize::Make(SK_Scalar1 * 2, SK_Scalar1 * 2),
+                                                    nullptr));
 
         SkMipMap::Level prevLevel;
         sk_bzero(&prevLevel, sizeof(prevLevel));
 
         SkScalar scale = SK_Scalar1;
         for (int j = 0; j < 30; ++j) {
             scale = scale * 2 / 3;
 
             SkMipMap::Level level;
-            if (mm->extractLevel(scale, &level)) {
+            if (mm->extractLevel(SkSize::Make(scale, scale), &level)) {
                 REPORTER_ASSERT(reporter, level.fPixmap.addr());
                 REPORTER_ASSERT(reporter, level.fPixmap.width() > 0);
                 REPORTER_ASSERT(reporter, level.fPixmap.height() > 0);
                 REPORTER_ASSERT(reporter, (int)level.fPixmap.rowBytes() >= level.fPixmap.width() * 4);
 
                 if (prevLevel.fPixmap.addr()) {
                     REPORTER_ASSERT(reporter, level.fPixmap.width() <= prevLevel.fPixmap.width());
                     REPORTER_ASSERT(reporter, level.fPixmap.height() <= prevLevel.fPixmap.height());
                 }
                 prevLevel = level;
             }
         }
     }
 }