Implement a persistent uniqueID-based cache for SkImageFilter.

include/core/SkPicture.h

 
 /*
  * Copyright 2007 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 SkPicture_DEFINED
@@ skipping 212 matching lines @@
     // V21: add pushCull, popCull
     // V22: SK_PICT_FACTORY_TAG's size is now the chunk size in bytes
     // V23: SkPaint::FilterLevel became a real enum
     // V24: SkTwoPointConicalGradient now has fFlipped flag for gradient flipping
     // V25: SkDashPathEffect now only writes phase and interval array when flattening
     // V26: Removed boolean from SkColorShader for inheriting color from SkPaint.
     // V27: Remove SkUnitMapper from gradients (and skia).
     // V28: No longer call bitmap::flatten inside SkWriteBuffer::writeBitmap.
     // V29: Removed SaveFlags parameter from save().
     // V30: Remove redundant SkMatrix from SkLocalMatrixShader.
+    // V31: Add a serialized UniqueID to SkImageFilter.
 
     // Note: If the picture version needs to be increased then please follow the
     // steps to generate new SKPs in (only accessible to Googlers): http://goo.gl/qATVcw
 
     // Only SKPs within the min/current picture version range (inclusive) can be read.
     static const uint32_t MIN_PICTURE_VERSION = 19;
-    static const uint32_t CURRENT_PICTURE_VERSION = 30;
+    static const uint32_t CURRENT_PICTURE_VERSION = 31;
 
     mutable uint32_t      fUniqueID;
 
     // TODO: make SkPictureData const when clone method goes away
     SkAutoTDelete<SkPictureData> fData;
     int                   fWidth, fHeight;
     mutable SkAutoTUnref<const AccelData> fAccelData;
 
     mutable SkTDArray<DeletionListener*> fDeletionListeners;  // pointers are refed
 
@@ skipping 37 matching lines @@
     friend class SkPictureReplacementPlayback; // to access OperationList
 
     typedef SkRefCnt INHERITED;
 
     SkPicture(int width, int height, SkRecord*);  // Takes ownership.
     SkAutoTDelete<SkRecord> fRecord;
     bool fRecordWillPlayBackBitmaps; // TODO: const
 };
 
 #endif