use pixmaps in mipmap api

src/core/SkBitmapController.cpp

 /*
  * Copyright 2015 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 "SkBitmapController.h"
 #include "SkBitmapProvider.h"
@@ skipping 167 matching lines @@
         if (nullptr == fCurrMip->data()) {
             sk_throw();
         }
         
         SkScalar levelScale = SkScalarInvert(invScale);
         SkMipMap::Level level;
         if (fCurrMip->extractLevel(levelScale, &level)) {
             SkScalar invScaleFixup = level.fScale;
             fInvMatrix.postScale(invScaleFixup, invScaleFixup);
             
-            const SkImageInfo info = provider.info().makeWH(level.fWidth, level.fHeight);
             // todo: if we could wrap the fCurrMip in a pixelref, then we could just install
             //       that here, and not need to explicitly track it ourselves.
-            return fResultBitmap.installPixels(info, level.fPixels, level.fRowBytes);
+            return fResultBitmap.installPixels(level.fPixmap);
         } else {
             // failed to extract, so release the mipmap
             fCurrMip.reset(nullptr);
         }
     }
     return false;
 }
 
 SkDefaultBitmapControllerState::SkDefaultBitmapControllerState(const SkBitmapProvider& provider,
                                                                const SkMatrix& inv,
@@ skipping 16 matching lines @@
                   fResultBitmap.getColorTable());
 }
 
 SkBitmapController::State* SkDefaultBitmapController::onRequestBitmap(const SkBitmapProvider& bm,
                                                                       const SkMatrix& inverse,
                                                                       SkFilterQuality quality,
                                                                       void* storage, size_t size) {
     return SkInPlaceNewCheck<SkDefaultBitmapControllerState>(storage, size, bm, inverse, quality);
 }