1 /* 2 * Copyright 2012 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkTileGrid_DEFINED 9 #define SkTileGrid_DEFINED 10 11 #include "SkBBHFactory.h" 12 #include "SkBBoxHierarchy.h" 13 14 /** 15 * Subclass of SkBBoxHierarchy that stores elements in buckets that correspond 16 * to tile regions, disposed in a regular grid. This is useful when the tile 17 * structure that will be use in search() calls is known prior to insertion. 18 */ 19 class SkTileGrid : public SkBBoxHierarchy { 20 public: 21 SkTileGrid(int xTiles, int yTiles, const SkTileGridFactory::TileGridInfo& info); 22 23 virtual ~SkTileGrid(); 24 25 /** 26 * Insert a data pointer and corresponding bounding box 27 * @param data An arbitrary data pointer, may be NULL. 28 * @param bounds The bounding box, should not be empty. 29 * @param defer Ignored; SkTileGrid does not defer insertions. 30 */ 31 virtual void insert(void* data, const SkRect& bounds, bool) SK_OVERRIDE; 32 33 virtual void flushDeferredInserts() SK_OVERRIDE {}; 34 35 /** 36 * Populate 'results' with data pointers corresponding to bounding boxes that intersect 'query'. 37 * This will be fastest if the query is an exact match to a single grid tile. 38 */ 39 virtual void search(const SkRect& query, SkTDArray<void*>* results) const SK_OVERRIDE; 40 41 virtual void clear() SK_OVERRIDE; 42 43 virtual int getCount() const SK_OVERRIDE { return fCount; } 44 45 virtual int getDepth() const SK_OVERRIDE { return -1; } 46 47 virtual void rewindInserts() SK_OVERRIDE; 48 49 // For testing. 50 int tileCount(int x, int y) { return fTiles[y * fXTiles + x].count(); } 51 52 private: 53 struct Entry { 54 size_t order; // Insertion order. Used to preserve order when merging multiple tiles. 55 void* data; 56 }; 57 58 const int fXTiles, fYTiles; 59 SkTileGridFactory::TileGridInfo fInfo; 60 size_t fCount; 61 62 // (fXTiles * fYTiles) SkTDArrays, each listing data overlapping that tile in insertion order. 63 SkTDArray<Entry>* fTiles; 64 65 typedef SkBBoxHierarchy INHERITED; 66 }; 67 68 #endif 69
