respect srgb gamma when building mips

gm/showmiplevels.cpp

 /*
  * Copyright 2016 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 "Resources.h"
@@ skipping 126 matching lines @@
     }
 
     template <typename F> void drawLevels(SkCanvas* canvas, const SkBitmap& baseBM, F func) {
         SkScalar x = 4;
         SkScalar y = 4;
 
         SkPixmap prevPM;
         baseBM.lockPixels();
         baseBM.peekPixels(&prevPM);
 
-        SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(baseBM, nullptr));
+        SkSourceGammaTreatment treatment = SkSourceGammaTreatment::kIgnore;
+        SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(baseBM, treatment, nullptr));
 
         int index = 0;
         SkMipMap::Level level;
         SkScalar scale = 0.5f;
         while (mm->extractLevel(SkSize::Make(scale, scale), &level)) {
             SkBitmap bm = func(prevPM, level.fPixmap);
             DrawAndFrame(canvas, bm, x, y);
 
             if (level.fPixmap.width() <= 2 || level.fPixmap.height() <= 2) {
                 break;
@@ skipping 87 matching lines @@
         SkPaint paint;
         paint.setStyle(SkPaint::kStroke_Style);
         paint.setColor(0xFFFFCCCC);
         canvas->drawRect(SkRect::MakeIWH(bm.width(), bm.height()).makeOffset(x, y).makeOutset(0.5f, 0.5f), paint);
     }
 
     void drawLevels(SkCanvas* canvas, const SkBitmap& baseBM) {
         SkScalar x = 4;
         SkScalar y = 4;
 
-        SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(baseBM, nullptr));
+        SkSourceGammaTreatment treatment = SkSourceGammaTreatment::kIgnore;
+        SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(baseBM, treatment, nullptr));
 
         int index = 0;
         SkMipMap::Level level;
         SkScalar scale = 0.5f;
         while (mm->extractLevel(SkSize::Make(scale, scale), &level)) {
             SkBitmap bm;
             bm.installPixels(level.fPixmap);
             DrawAndFrame(canvas, bm, x, y);
 
             if (level.fPixmap.width() <= 2 || level.fPixmap.height() <= 2) {
@@ skipping 35 matching lines @@
         }
     }
 
 private:
     typedef skiagm::GM INHERITED;
 };
 DEF_GM( return new ShowMipLevels2(255, 255); )
 DEF_GM( return new ShowMipLevels2(256, 255); )
 DEF_GM( return new ShowMipLevels2(255, 256); )
 DEF_GM( return new ShowMipLevels2(256, 256); )