Handling large jpegs in CPU raster - downsample to display res and 565

src/core/SkImageCacherator.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkImageCacherator_DEFINED
 #define SkImageCacherator_DEFINED
 
@@ skipping 18 matching lines @@
     const SkImageInfo& info() const { return fInfo; }
     uint32_t uniqueID() const { return fUniqueID; }
 
     /**
      *  On success (true), bitmap will point to the pixels for this generator. If this returns
      *  false, the bitmap will be reset to empty.
      *
      *  If not NULL, the client will be notified (->notifyAddedToCache()) when resources are
      *  added to the cache on its behalf.
      */
-    bool lockAsBitmap(SkBitmap*, const SkImage* client);
+    bool lockAsBitmap(SkBitmap*, const SkImage* client, SkScalar scaleHint = SK_Scalar1);
 
     /**
      *  Returns a ref() on the texture produced by this generator. The caller must call unref()
      *  when it is done. Will return nullptr on failure.
      *
      *  If not NULL, the client will be notified (->notifyAddedToCache()) when resources are
      *  added to the cache on its behalf.
      *
      *  The caller is responsible for calling texture->unref() when they are done.
      */
     GrTexture* lockAsTexture(GrContext*, const GrTextureParams&, const SkImage* client);
 
     /**
      *  If the underlying src naturally is represented by an encoded blob (in SkData), this returns
      *  a ref to that data. If not, it returns null.
      */
     SkData* refEncoded();
 
 private:
     SkImageCacherator(SkImageGenerator*, const SkImageInfo&, const SkIPoint&, uint32_t uniqueID);
 
-    bool generateBitmap(SkBitmap*);
-    bool tryLockAsBitmap(SkBitmap*, const SkImage*);
+    bool generateBitmap(SkBitmap*, SkScalar scaleHint);
+    bool tryLockAsBitmap(SkBitmap*, const SkImage*, SkScalar scaleHint = SK_Scalar1);
 #if SK_SUPPORT_GPU
     // Returns the texture. If the cacherator is generating the texture and wants to cache it,
     // it should use the passed in key (if the key is valid).
     GrTexture* lockTexture(GrContext*, const GrUniqueKey& key, const SkImage* client);
 #endif
 
     class ScopedGenerator {
         SkImageCacherator* fCacher;
     public:
         ScopedGenerator(SkImageCacherator* cacher) : fCacher(cacher) {
@@ skipping 10 matching lines @@
     SkAutoTDelete<SkImageGenerator> fNotThreadSafeGenerator;
 
     const SkImageInfo   fInfo;
     const SkIPoint      fOrigin;
     const uint32_t      fUniqueID;
 
     friend class Cacherator_GrTextureParamsAdjuster;
 };
 
 #endif