Dedup SkPaths by gen-ID when going to .skp

src/core/SkPictureRecord.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPictureRecord_DEFINED
 #define SkPictureRecord_DEFINED
 
 #include "SkCanvas.h"
 #include "SkFlattenable.h"
 #include "SkPicture.h"
 #include "SkPictureData.h"
 #include "SkTArray.h"
 #include "SkTDArray.h"
+#include "SkTHash.h"
 #include "SkWriter32.h"
 
 // These macros help with packing and unpacking a single byte value and
 // a 3 byte value into/out of a uint32_t
 #define MASK_24 0x00FFFFFF
 #define UNPACK_8_24(combined, small, large)             \
     small = (combined >> 24) & 0xFF;                    \
     large = combined & MASK_24;
 #define PACK_8_24(small, large) ((small << 24) | large)
 
@@ skipping 192 matching lines @@
     size_t recordClipRegion(const SkRegion& region, SkRegion::Op op);
     void recordSave();
     void recordSaveLayer(const SkRect* bounds, const SkPaint* paint, SaveFlags flags);
     void recordRestore(bool fillInSkips = true);
 
 private:
     SkPictureContentInfo fContentInfo;
 
     SkTArray<SkBitmap> fBitmaps;
     SkTArray<SkPaint>  fPaints;
-    SkTArray<SkPath>   fPaths;
+
+    struct PathHash {
+        uint32_t operator()(const SkPath& p) { return p.getGenerationID(); }
+    };
+    SkTHashMap<SkPath, int, PathHash> fPaths;
 
     SkWriter32 fWriter;
 
     // we ref each item in these arrays
     SkTDArray<const SkImage*>    fImageRefs;
     SkTDArray<const SkPicture*>  fPictureRefs;
     SkTDArray<const SkTextBlob*> fTextBlobRefs;
 
     uint32_t fRecordFlags;
     int      fInitialSaveCount;
 
     friend class SkPictureData;   // for SkPictureData's SkPictureRecord-based constructor
 
     typedef SkCanvas INHERITED;
 };
 
 #endif