fix size_t/int warnings in pictures

src/core/SkPictureFlat.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 SkPictureFlat_DEFINED
 #define SkPictureFlat_DEFINED
 
@@ skipping 511 matching lines @@
 
         // Layout of fScratch: [ SkFlatData header, 20 bytes ] [ data ..., 4-byte aligned ]
         fScratch.reset();
         fScratch.reserve(sizeof(SkFlatData));
         Traits::Flatten(fScratch, element);
         const size_t dataSize = fScratch.bytesWritten() - sizeof(SkFlatData);
 
         // Reinterpret data in fScratch as an SkFlatData.
         SkFlatData* scratch = (SkFlatData*)fScratch.getWriter32()->contiguousArray();
         SkASSERT(scratch != NULL);
-        scratch->stampHeader(index, dataSize);
+        scratch->stampHeader(index, SkToS32(dataSize));
         return *scratch;
     }
 
     // This result is owned by fController and lives as long as it does (unless unalloc'd).
     SkFlatData* detachScratch() {
         // Allocate a new SkFlatData exactly big enough to hold our current scratch.
         // We use the controller for this allocation to extend the allocation's lifetime and allow
         // the controller to do whatever memory management it wants.
         SkFlatData* detached = (SkFlatData*)fController->allocThrow(fScratch.bytesWritten());
 
@@ skipping 56 matching lines @@
     }
 
 private:
     SkChunkAlloc               fHeap;
     SkAutoTUnref<SkRefCntSet>  fTypefaceSet;
     void*                      fLastAllocated;
     mutable SkTypefacePlayback fTypefacePlayback;
 };
 
 #endif