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1 | 1 |
2 /* | 2 /* |
3 * Copyright 2012 Google Inc. | 3 * Copyright 2012 Google Inc. |
4 * | 4 * |
5 * Use of this source code is governed by a BSD-style license that can be | 5 * Use of this source code is governed by a BSD-style license that can be |
6 * found in the LICENSE file. | 6 * found in the LICENSE file. |
7 */ | 7 */ |
8 | 8 |
9 #ifndef SkBBoxHierarchy_DEFINED | 9 #ifndef SkBBoxHierarchy_DEFINED |
10 #define SkBBoxHierarchy_DEFINED | 10 #define SkBBoxHierarchy_DEFINED |
11 | 11 |
12 #include "SkRect.h" | 12 #include "SkRect.h" |
13 #include "SkTDArray.h" | 13 #include "SkTDArray.h" |
14 #include "SkRefCnt.h" | 14 #include "SkRefCnt.h" |
15 | 15 |
16 /** | 16 /** |
| 17 * Interface for a client class that implements utility methods needed |
| 18 * by SkBBoxHierarchy that require intrinsic knowledge of the data |
| 19 * object type that is stored in the bounding box hierarchy. |
| 20 */ |
| 21 class SkBBoxHierarchyClient { |
| 22 public: |
| 23 virtual ~SkBBoxHierarchyClient() {} |
| 24 |
| 25 /** |
| 26 * Implements a rewind stop condition used by rewindInserts |
| 27 * Must returns true if 'data' points to an object that should be re-wound |
| 28 * by rewinfInserts. |
| 29 */ |
| 30 virtual bool shouldRewind(void* data) = 0; |
| 31 }; |
| 32 |
| 33 /** |
17 * Interface for a spatial data structure that associates user data pointers wit
h axis-aligned | 34 * Interface for a spatial data structure that associates user data pointers wit
h axis-aligned |
18 * bounding boxes, and allows efficient retrieval of intersections with query re
ctangles. | 35 * bounding boxes, and allows efficient retrieval of intersections with query re
ctangles. |
19 */ | 36 */ |
20 class SkBBoxHierarchy : public SkRefCnt { | 37 class SkBBoxHierarchy : public SkRefCnt { |
21 public: | 38 public: |
22 SK_DECLARE_INST_COUNT(SkBBoxHierarchy) | 39 SK_DECLARE_INST_COUNT(SkBBoxHierarchy) |
23 | 40 |
| 41 SkBBoxHierarchy() : fClient(NULL) {} |
| 42 |
24 /** | 43 /** |
25 * Insert a data pointer and corresponding bounding box | 44 * Insert a data pointer and corresponding bounding box |
26 * @param data The data pointer, may be NULL | 45 * @param data The data pointer, may be NULL |
27 * @param bounds The bounding box, should not be empty | 46 * @param bounds The bounding box, should not be empty |
28 * @param defer Whether or not it is acceptable to delay insertion of this e
lement (building up | 47 * @param defer Whether or not it is acceptable to delay insertion of this e
lement (building up |
29 * an entire spatial data structure at once is often faster and produ
ces better | 48 * an entire spatial data structure at once is often faster and produ
ces better |
30 * structures than repeated inserts) until flushDeferredInserts is ca
lled or the first | 49 * structures than repeated inserts) until flushDeferredInserts is ca
lled or the first |
31 * search. | 50 * search. |
32 */ | 51 */ |
33 virtual void insert(void* data, const SkIRect& bounds, bool defer = false) =
0; | 52 virtual void insert(void* data, const SkIRect& bounds, bool defer = false) =
0; |
34 | 53 |
35 /** | 54 /** |
36 * If any insertions have been deferred, this forces them to be inserted | 55 * If any insertions have been deferred, this forces them to be inserted |
37 */ | 56 */ |
38 virtual void flushDeferredInserts() = 0; | 57 virtual void flushDeferredInserts() = 0; |
39 | 58 |
40 /** | 59 /** |
41 * Populate 'results' with data pointers corresponding to bounding boxes tha
t intersect 'query' | 60 * Populate 'results' with data pointers corresponding to bounding boxes tha
t intersect 'query' |
42 */ | 61 */ |
43 virtual void search(const SkIRect& query, SkTDArray<void*>* results) = 0; | 62 virtual void search(const SkIRect& query, SkTDArray<void*>* results) = 0; |
44 | 63 |
45 virtual void clear() = 0; | 64 virtual void clear() = 0; |
46 | 65 |
47 /** | 66 /** |
48 * Gets the number of insertions | 67 * Gets the number of insertions |
49 */ | 68 */ |
50 virtual int getCount() const = 0; | 69 virtual int getCount() const = 0; |
51 | 70 |
| 71 /** |
| 72 * Rewinds all the most recently inserted data elements until an element |
| 73 * is encountered for which client->shouldRewind(data) returns false. May |
| 74 * not rewind elements that were inserted prior to the last call to |
| 75 * flushDeferredInserts. |
| 76 */ |
| 77 virtual void rewindInserts() = 0; |
| 78 |
| 79 void setClient(SkBBoxHierarchyClient* client) { fClient = client; } |
| 80 |
| 81 protected: |
| 82 SkBBoxHierarchyClient* fClient; |
| 83 |
52 private: | 84 private: |
53 typedef SkRefCnt INHERITED; | 85 typedef SkRefCnt INHERITED; |
54 }; | 86 }; |
55 | 87 |
56 #endif | 88 #endif |
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