Allow SkLazyPixelRef to use SkScaledImageCache

src/core/SkScaledImageCache.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 SkScaledImageCache_DEFINED
 #define SkScaledImageCache_DEFINED
 
@@ skipping 13 matching lines @@
  */
 class SkScaledImageCache {
 public:
     struct ID;
 
     /*
      *  The following static methods are thread-safe wrappers around a global
      *  instance of this cache.
      */
 
+    static ID* FindAndLock(uint32_t pixelGenerationID,
+                           int32_t width,
+                           int32_t height,
+                           SkBitmap* returnedBitmap);
+
     static ID* FindAndLock(const SkBitmap& original, SkScalar scaleX,
-                           SkScalar scaleY, SkBitmap* scaled);
-    static ID* FindAndLockMip(const SkBitmap& original, SkMipMap const**);
+                           SkScalar scaleY, SkBitmap* returnedBitmap);
+    static ID* FindAndLockMip(const SkBitmap& original,
+                              SkMipMap const** returnedMipMap);
+
+
+    static ID* AddAndLock(uint32_t pixelGenerationID,
+                          int32_t width,
+                          int32_t height,
+                          const SkBitmap& bitmap);
 
     static ID* AddAndLock(const SkBitmap& original, SkScalar scaleX,
-                          SkScalar scaleY, const SkBitmap& scaled);
-    static ID* AddAndLockMip(const SkBitmap& original, const SkMipMap*);
+                          SkScalar scaleY, const SkBitmap& bitmap);
+    static ID* AddAndLockMip(const SkBitmap& original, const SkMipMap* mipMap);
 
     static void Unlock(ID*);
 
     static size_t GetBytesUsed();
     static size_t GetByteLimit();
     static size_t SetByteLimit(size_t newLimit);
 
     ///////////////////////////////////////////////////////////////////////////
 
     SkScaledImageCache(size_t byteLimit);
     ~SkScaledImageCache();
 
     /**
-     *  Search the cache for a scaled version of original. If found, return it
-     *  in scaled, and return its ID pointer. Use the returned ptr to unlock
-     *  the cache when you are done using scaled.
+     *  Search the cache for a matching bitmap (using generationID,
+     *  width, and height as a search key). If found, return it in
+     *  returnedBitmap, and return its ID pointer. Use the returned
+     *  ptr to unlock the cache when you are done using
+     *  returnedBitmap.
      *
-     *  If a match is not found, scaled will be unmodifed, and NULL will be
-     *  returned.
+     *  If a match is not found, returnedBitmap will be unmodifed, and
+     *  NULL will be returned.
+     *
+     *  This is used if there is no scaling or subsetting, for example
+     *  by SkLazyPixelRef.
+     */
+    ID* findAndLock(uint32_t pixelGenerationID, int32_t width, int32_t height,
+                    SkBitmap* returnedBitmap);
+
+    /**
+     *  Search the cache for a scaled version of original. If found,
+     *  return it in returnedBitmap, and return its ID pointer. Use
+     *  the returned ptr to unlock the cache when you are done using
+     *  returnedBitmap.
+     *
+     *  If a match is not found, returnedBitmap will be unmodifed, and
+     *  NULL will be returned.
      */
     ID* findAndLock(const SkBitmap& original, SkScalar scaleX,
-                    SkScalar scaleY, SkBitmap* scaled);
-    ID* findAndLockMip(const SkBitmap& original, SkMipMap const**);
+                    SkScalar scaleY, SkBitmap* returnedBitmap);
+    ID* findAndLockMip(const SkBitmap& original,
+                       SkMipMap const** returnedMipMap);
 
     /**
-     *  To add a new (scaled) bitmap to the cache, call AddAndLock. Use the
-     *  returned ptr to unlock the cache when you are done using scaled.
+     *  To add a new bitmap (or mipMap) to the cache, call
+     *  AddAndLock. Use the returned ptr to unlock the cache when you
+     *  are done using scaled.
+     *
+     *  Use (generationID, width, and height) or (original, scaleX,
+     *  scaleY) or (original) as a search key
      */
+    ID* addAndLock(uint32_t pixelGenerationID, int32_t width, int32_t height,
+                   const SkBitmap& bitmap);
     ID* addAndLock(const SkBitmap& original, SkScalar scaleX,
-                   SkScalar scaleY, const SkBitmap& scaled);
-    ID* addAndLockMip(const SkBitmap& original, const SkMipMap*);
+                   SkScalar scaleY, const SkBitmap& bitmap);
+    ID* addAndLockMip(const SkBitmap& original, const SkMipMap* mipMap);
 
     /**
      *  Given a non-null ID ptr returned by either findAndLock or addAndLock,
      *  this releases the associated resources to be available to be purged
      *  if needed. After this, the cached bitmap should no longer be
      *  referenced by the caller.
      */
     void unlock(ID*);
 
     size_t getBytesUsed() const { return fBytesUsed; }
@@ skipping 12 matching lines @@
     Rec*    fHead;
     Rec*    fTail;
 
     class Hash;
     Hash*   fHash;
 
     size_t  fBytesUsed;
     size_t  fByteLimit;
     int     fCount;
 
-    Rec* findAndLock(const SkBitmap& original, SkScalar sx, SkScalar sy);
+    Rec* findAndLock(uint32_t generationID, SkScalar sx, SkScalar sy,
+                     const SkIRect& bounds);
+    void addAndLock(Rec* rec);
 
     void purgeAsNeeded();
 
     // linklist management
     void moveToHead(Rec*);
     void addToHead(Rec*);
     void detach(Rec*);
 #ifdef SK_DEBUG
     void validate() const;
 #else
     void validate() const {}
 #endif
 };
-
 #endif