Big Cleanup: SkBitmapFactory, SkLazyPixelRef, SkImageCache

src/lazy/SkDiscardablePixelRef.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDiscardablePixelRef_DEFINED
 #define SkDiscardablePixelRef_DEFINED
 
+#include "SkDiscardableMemory.h"
 #include "SkPixelRef.h"
 #include "SkImageGenerator.h"
 #include "SkImageInfo.h"
 
-class SkDiscardableMemory;
-
 /**
  * An interface that allows a purgable PixelRef to re-decode an image.
  */
 
+typedef SkDiscardableMemory* (*SkDiscardableMemoryFactory)(size_t bytes);
+
+
 class SkDiscardablePixelRef : public SkPixelRef {
 public:
     /**
      *  Takes ownership of SkImageGenerator.  If this method fails for
      *  whatever reason, it will return false and immediatetely delete
      *  the generator.  If it succeeds, it will modify destination
      *  bitmap.
      *
      *  If Install fails or when the SkDiscardablePixelRef that is
      *  installed into destination is destroyed, it will call
      *  SkDELETE() on the generator.  Therefore, generator should be
      *  allocated with SkNEW() or SkNEW_ARGS().
+     *
+     *  @param destination Upon success, this bitmap will be
+     *  configured and have a pixelref installed.
+     *
+     *  @param factory If not NULL, this object will be used as a
+     *  source of discardable memory when decoding.  If NULL, then
+     *  SkDiscardableMemory::Create() will be called.
+     *
+     *  @return true iff successful.
      */
-    static bool Install(SkImageGenerator* generator, SkBitmap* destination);
+    static bool Install(SkImageGenerator* generator,
+                        SkBitmap* destination,
+                        SkDiscardableMemory::Factory* factory = NULL);
 
     SK_DECLARE_UNFLATTENABLE_OBJECT()
 
 protected:
     ~SkDiscardablePixelRef();
     virtual void* onLockPixels(SkColorTable**) SK_OVERRIDE;
     virtual void onUnlockPixels() SK_OVERRIDE;
     virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; }
 
     virtual SkData* onRefEncodedData() SK_OVERRIDE {
         return fGenerator->refEncodedData();
     }
 
 private:
     SkImageGenerator* const fGenerator;
+    SkDiscardableMemory::Factory* const fDMFactory;
     const SkImageInfo fInfo;
     const size_t fSize;  // size of memory to be allocated
     const size_t fRowBytes;
     // These const members should not change over the life of the
     // PixelRef, since the SkBitmap doesn't expect them to change.
 
     SkDiscardableMemory* fDiscardableMemory;
 
     /* Takes ownership of SkImageGenerator. */
     SkDiscardablePixelRef(SkImageGenerator* generator,
                           const SkImageInfo& info,
                           size_t size,
-                          size_t rowBytes);
+                          size_t rowBytes,
+                          SkDiscardableMemory::Factory* factory);
 };
 #endif  // SkDiscardablePixelRef_DEFINED