Reduce ref counting in SkPictureRecorder.

src/core/SkPicture.cpp

 /*
  * 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.
  */
 
 
 #include "SkPictureFlat.h"
 #include "SkPictureData.h"
@@ skipping 438 matching lines @@
 #endif
 
 bool SkPicture::hasText()             const { return fAnalysis.fHasText; }
 bool SkPicture::willPlayBackBitmaps() const { return fAnalysis.fWillPlaybackBitmaps; }
 int  SkPicture::approximateOpCount()  const { return fRecord->count(); }
 
 SkPicture::SkPicture(const SkRect& cullRect, SkRecord* record, SnapshotArray* drawablePicts,
                      SkBBoxHierarchy* bbh, size_t approxBytesUsedBySubPictures)
     : fUniqueID(0)
     , fCullRect(cullRect)
-    , fRecord(SkRef(record))
-    , fBBH(SkSafeRef(bbh))
+    , fRecord(record)   // For performance, we take ownership of the caller's ref.
+    , fBBH(bbh)         // Ditto.
     , fDrawablePicts(drawablePicts)     // take ownership
     , fApproxBytesUsedBySubPictures(approxBytesUsedBySubPictures)
     , fAnalysis(*fRecord)
 {}
 
 
 static uint32_t gNextID = 1;
 uint32_t SkPicture::uniqueID() const {
     uint32_t id = sk_atomic_load(&fUniqueID, sk_memory_order_relaxed);
     while (id == 0) {
         uint32_t next = sk_atomic_fetch_add(&gNextID, 1u);
         if (sk_atomic_compare_exchange(&fUniqueID, &id, next,
                                        sk_memory_order_relaxed,
                                        sk_memory_order_relaxed)) {
             id = next;
         } else {
             // sk_atomic_compare_exchange replaced id with the current value of fUniqueID.
         }
     }
     return id;
 }