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Side by Side Diff: cc/base/reverse_spiral_iterator.h

Issue 2748263002: Move cc::DisplayItemList and related classes into cc/paint/ (Closed)
Patch Set: Merge branch 'master' into ccpaint Created 3 years, 9 months ago
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1 // Copyright 2016 The Chromium Authors. All rights reserved. 1 // Copyright 2016 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef CC_BASE_REVERSE_SPIRAL_ITERATOR_H_ 5 #ifndef CC_BASE_REVERSE_SPIRAL_ITERATOR_H_
6 #define CC_BASE_REVERSE_SPIRAL_ITERATOR_H_ 6 #define CC_BASE_REVERSE_SPIRAL_ITERATOR_H_
7 7
8 #include "base/logging.h" 8 #include "base/logging.h"
9 #include "cc/base/cc_export.h" 9 #include "cc/base/base_export.h"
10 #include "cc/base/index_rect.h" 10 #include "cc/base/index_rect.h"
11 11
12 namespace cc { 12 namespace cc {
13 13
14 // The spiral iterator which iterates in reverse direction based on directions 14 // The spiral iterator which iterates in reverse direction based on directions
15 // around the center rect in the given region. If the center rect is at index 15 // around the center rect in the given region. If the center rect is at index
16 // (2, 2), reverse spiral iterator gives following sequence on iterating. 16 // (2, 2), reverse spiral iterator gives following sequence on iterating.
17 // 17 //
18 // x 0 1 2 3 4 18 // x 0 1 2 3 4
19 // y ┌───┬───┬───┬───┬───┐ 19 // y ┌───┬───┬───┬───┬───┐
20 // 0 │ 9│ 10│ 11│ 12│ 13│ 20 // 0 │ 9│ 10│ 11│ 12│ 13│
21 // ├───┼───┼───┼───┼───┤ 21 // ├───┼───┼───┼───┼───┤
22 // 1 │ 8│ 21│ 22│ 23│ 14│ 22 // 1 │ 8│ 21│ 22│ 23│ 14│
23 // ├───┼───┼───┼───┼───┤ 23 // ├───┼───┼───┼───┼───┤
24 // 2 │ 7│ 20│ *│ 24│ 15│ 24 // 2 │ 7│ 20│ *│ 24│ 15│
25 // ├───┼───┼───┼───┼───┤ 25 // ├───┼───┼───┼───┼───┤
26 // 3 │ 6│ 19│ 18│ 17│ 16│ 26 // 3 │ 6│ 19│ 18│ 17│ 16│
27 // ├───┼───┼───┼───┼───┤ 27 // ├───┼───┼───┼───┼───┤
28 // 4 │ 5│ 4│ 3│ 2│ 1│ 28 // 4 │ 5│ 4│ 3│ 2│ 1│
29 // └───┴───┴───┴───┴───┘ 29 // └───┴───┴───┴───┴───┘
30 class CC_EXPORT ReverseSpiralIterator { 30 class CC_BASE_EXPORT ReverseSpiralIterator {
31 public: 31 public:
32 ReverseSpiralIterator(); 32 ReverseSpiralIterator();
33 ReverseSpiralIterator(const IndexRect& around_index_rect, 33 ReverseSpiralIterator(const IndexRect& around_index_rect,
34 const IndexRect& consider_index_rect, 34 const IndexRect& consider_index_rect,
35 const IndexRect& ignore_index_rect); 35 const IndexRect& ignore_index_rect);
36 36
37 ~ReverseSpiralIterator() = default; 37 ~ReverseSpiralIterator() = default;
38 38
39 ReverseSpiralIterator& operator=(ReverseSpiralIterator&& other) = default;
40
39 operator bool() const; 41 operator bool() const;
40 ReverseSpiralIterator& operator++(); 42 ReverseSpiralIterator& operator++();
41 int index_x() const { return index_x_; } 43 int index_x() const { return index_x_; }
42 int index_y() const { return index_y_; } 44 int index_y() const { return index_y_; }
43 45
44 private: 46 private:
45 int current_step_count() const { 47 int current_step_count() const {
46 return (direction_ == UP || direction_ == DOWN) ? vertical_step_count_ 48 return (direction_ == UP || direction_ == DOWN) ? vertical_step_count_
47 : horizontal_step_count_; 49 : horizontal_step_count_;
48 } 50 }
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62 int delta_x_; 64 int delta_x_;
63 int delta_y_; 65 int delta_y_;
64 int current_step_; 66 int current_step_;
65 int horizontal_step_count_; 67 int horizontal_step_count_;
66 int vertical_step_count_; 68 int vertical_step_count_;
67 }; 69 };
68 70
69 } // namespace cc 71 } // namespace cc
70 72
71 #endif // CC_BASE_REVERSE_SPIRAL_ITERATOR_H_ 73 #endif // CC_BASE_REVERSE_SPIRAL_ITERATOR_H_
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