scaling API on SkPixmap

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 103 matching lines @@
         if (!orig.requestLock(&src)) {
             return false;
         }
         if (!SkBitmapScaler::Resize(&fResultBitmap, src.pixmap(), kHQ_RESIZE_METHOD,
                                     dstW, dstH, SkResourceCache::GetAllocator())) {
             return false; // we failed to create fScaledBitmap
         }
         
         SkASSERT(fResultBitmap.getPixels());
         fResultBitmap.setImmutable();
-        if (SkBitmapCache::AddWH(desc, fResultBitmap)) {
-            provider.notifyAddedToCache();
+        if (!provider.isVolatile()) {
+            if (SkBitmapCache::AddWH(desc, fResultBitmap)) {
+                provider.notifyAddedToCache();
+            }
         }
     }
     
     SkASSERT(fResultBitmap.getPixels());
     
     fInvMatrix.postScale(SkIntToScalar(dstW) / provider.width(),
                          SkIntToScalar(dstH) / provider.height());
     fQuality = kLow_SkFilterQuality;
     return true;
 }
@@ skipping 74 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);
 }