blob: a26174960953d97a039cb94d6b2cbf895ddb7b9b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkQuadTree_DEFINED
#define SkQuadTree_DEFINED
#include "SkRect.h"
#include "SkTDArray.h"
#include "SkBBoxHierarchy.h"
/**
* An QuadTree implementation. In short, it is a tree containing a hierarchy of bounding rectangles
* in which each internal node has exactly four children.
*
* For more details see:
*
* http://en.wikipedia.org/wiki/Quadtree
*/
class SkQuadTree : public SkBBoxHierarchy {
public:
SK_DECLARE_INST_COUNT(SkQuadTree)
/**
* Create a new QuadTree
*/
static SkQuadTree* Create(const SkIRect& bounds);
virtual ~SkQuadTree();
/**
* Insert a node, consisting of bounds and a data value into the tree, if we don't immediately
* need to use the tree; we may allow the insert to be deferred (this can allow us to bulk-load
* a large batch of nodes at once, which tends to be faster and produce a better tree).
* @param data The data value
* @param bounds The corresponding bounding box
* @param defer Can this insert be deferred? (this may be ignored)
*/
virtual void insert(void* data, const SkIRect& bounds, bool defer = false) SK_OVERRIDE;
/**
* If any inserts have been deferred, this will add them into the tree
*/
virtual void flushDeferredInserts() SK_OVERRIDE {}
/**
* Given a query rectangle, populates the passed-in array with the elements it intersects
*/
virtual void search(const SkIRect& query, SkTDArray<void*>* results) SK_OVERRIDE;
virtual void clear() SK_OVERRIDE;
/**
* Gets the depth of the tree structure
*/
virtual int getDepth() const SK_OVERRIDE;
/**
* This gets the insertion count (rather than the node count)
*/
virtual int getCount() const SK_OVERRIDE { return fCount; }
virtual void rewindInserts() SK_OVERRIDE;
private:
class QuadTreeNode;
SkQuadTree(const SkIRect& bounds);
// This is the count of data elements (rather than total nodes in the tree)
int fCount;
QuadTreeNode* fRoot;
typedef SkBBoxHierarchy INHERITED;
};
#endif
|
