Allow SkLazyPixelRef to use SkScaledImageCache

src/lazy/SkLazyPixelRef.h

Index: src/lazy/SkLazyPixelRef.h
diff --git a/src/lazy/SkLazyPixelRef.h b/src/lazy/SkLazyPixelRef.h
index 8f7a751e953693efd0b81cc9e0bafd24dba6154c..b6e0454b1e93cd8ff08ccdf4cb7c3ba8fb2b008d 100644
--- a/src/lazy/SkLazyPixelRef.h
+++ b/src/lazy/SkLazyPixelRef.h
@@ -33,8 +33,9 @@ public:
      *  Create a new SkLazyPixelRef.
      *  @param SkData Encoded data representing the pixels.
      *  @param DecodeProc Called to decode the pixels when needed. Must be non-NULL.
-     *  @param SkImageCache Object that handles allocating and freeing the pixel memory, as needed.
-     *         Must not be NULL.
+     *  @param SkImageCache Object that handles allocating and freeing
+     *         the pixel memory, as needed.  If NULL, use the global
+     *         SkScaledImageCache.
      */
     SkLazyPixelRef(SkData*, SkBitmapFactory::DecodeProc, SkImageCache*);
 
@@ -50,6 +51,13 @@ public:
     static void ResetCacheStats() { gCacheHits = gCacheMisses = 0; }
 #endif
 
+    /**
+     *  The allocator is used when (fImageCache==NULL) to allocate
+     *  concrete PixelRefs as needed.  If NULL, use the default allocator.
+     *  This is passed directly into SkBitmap::allocPixels().
+     */
+    virtual void setAllocator(SkBitmap::Allocator * allocator = NULL);
+
     // No need to flatten this object. When flattening an SkBitmap, SkOrderedWriteBuffer will check
     // the encoded data and write that instead.
     // Future implementations of SkFlattenableWriteBuffer will need to special case for
@@ -69,9 +77,11 @@ private:
     SkData*                     fData;
     SkBitmapFactory::DecodeProc fDecodeProc;
     SkImageCache*               fImageCache;
+    // fCacheId is a (SkScaledImageCache::ID*) or a (SkImageCache::ID).
     intptr_t                    fCacheId;
     size_t                      fRowBytes;
     SkImage::Info               fLazilyCachedInfo;
+    SkBitmap::Allocator*        fAllocator;
 
 #if LAZY_CACHE_STATS
     static int32_t              gCacheHits;
@@ -80,6 +90,9 @@ private:
 
     // lazily initialized our cached info. Returns NULL on failure.
     const SkImage::Info* getCachedInfo();
+    void* lockScaledImageCachePixels();
+    void* lockImageCachePixels();
+
 
     typedef SkPixelRef INHERITED;
 };