no need to refcnt colortables, since pixelrefs own them

include/core/SkBitmap.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBitmap_DEFINED
 #define SkBitmap_DEFINED
 
@@ skipping 651 matching lines @@
     };
 
     SkDEVCODE(void toString(SkString* str) const;)
 
 private:
     struct MipMap;
     mutable MipMap* fMipMap;
 
     mutable SkPixelRef* fPixelRef;
     mutable int         fPixelLockCount;
-    // either user-specified (in which case it is not treated as mutable)
-    // or a cache of the returned value from fPixelRef->lockPixels()
+    // These are just caches from the locked pixelref
     mutable void*       fPixels;
     mutable SkColorTable* fColorTable;    // only meaningful for kIndex8
 
     SkIPoint    fPixelRefOrigin;
 
     enum Flags {
         kImageIsOpaque_Flag     = 0x01,
         kImageIsVolatile_Flag   = 0x02,
         kImageIsImmutable_Flag  = 0x04,
 #ifdef SK_BUILD_FOR_ANDROID
@@ skipping 144 matching lines @@
 
 inline SkPMColor SkBitmap::getIndex8Color(int x, int y) const {
     SkASSERT(fPixels);
     SkASSERT(fConfig == kIndex8_Config);
     SkASSERT((unsigned)x < fWidth && (unsigned)y < fHeight);
     SkASSERT(fColorTable);
     return (*fColorTable)[*((const uint8_t*)fPixels + y * fRowBytes + x)];
 }
 
 #endif