bump the size of the atlas id to 64 bits

src/gpu/GrBatchAtlas.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrBatchAtlas_DEFINED
 #define GrBatchAtlas_DEFINED
 
 #include "GrTexture.h"
 #include "SkPoint.h"
 #include "SkTDArray.h"
 #include "SkTInternalLList.h"
 
 class BatchPlot;
 class GrBatchTarget;
 class GrRectanizer;
 
 typedef SkTInternalLList<BatchPlot> GrBatchPlotList;
 
 class GrBatchAtlas {
 public:
     typedef uint64_t BatchToken;
     // An AtlasID is an opaque handle which callers can use to determine if the atlas contains
     // a specific piece of data
-    typedef uint32_t AtlasID;
+    typedef uint64_t AtlasID;
     static const uint32_t kInvalidAtlasID = 0;
     static const uint64_t kInvalidAtlasGeneration = 0;
 
     // A function pointer for use as a callback during eviction.  Whenever GrBatchAtlas evicts a
     // specific AtlasID, it will call all of the registered listeners so they can optionally process
     // the eviction
     typedef void (*EvictionFunc)(GrBatchAtlas::AtlasID, void*);
 
     GrBatchAtlas(GrTexture*, int numPlotsX, int numPlotsY);
     ~GrBatchAtlas();
@@ skipping 62 matching lines @@
     };
 
     void setLastUseTokenBulk(const BulkUseTokenUpdater& reffer, BatchToken);
 
     static const int kGlyphMaxDim = 256;
     static bool GlyphTooLargeForAtlas(int width, int height) {
         return width > kGlyphMaxDim || height > kGlyphMaxDim;
     }
 
 private:
-    static int GetIndexFromID(AtlasID id) {
+    static uint32_t GetIndexFromID(AtlasID id) {
         return id & 0xffff;
     }
 
-    static int GetGenerationFromID(AtlasID id) {
-        return (id >> 16) & 0xffff;
+    // top 48 bits are reserved for the generation ID
+    static uint64_t GetGenerationFromID(AtlasID id) {
+        return (id >> 16) & 0xffffffffffff;
     }
 
     inline void updatePlot(GrBatchTarget*, AtlasID*, BatchPlot*);
 
     inline void makeMRU(BatchPlot* plot);
 
     inline void processEviction(AtlasID);
 
     GrTexture* fTexture;
-    int fNumPlotsX;
-    int fNumPlotsY;
-    int fPlotWidth;
-    int fPlotHeight;
+    uint32_t fNumPlotsX;
+    uint32_t fNumPlotsY;
+    uint32_t fPlotWidth;
+    uint32_t fPlotHeight;
     size_t fBPP;
     uint64_t fAtlasGeneration;
 
     struct EvictionData {
         EvictionFunc fFunc;
         void* fData;
     };
 
     SkTDArray<EvictionData> fEvictionCallbacks;
     // allocated array of GrBatchPlots
     SkAutoTUnref<BatchPlot>* fPlotArray;
     // LRU list of GrPlots (MRU at head - LRU at tail)
     GrBatchPlotList fPlotList;
 };
 
 #endif