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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 7204 | leency | 1 | // Actions history |
| 2 | |||
| 3 | #define MAX_ACTIONS_COUNT 10 |
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| 4 | |||
| 5 | struct _ActionsHistory { |
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| 6 | dword stack[MAX_ACTIONS_COUNT]; |
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| 7 | dword head; |
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| 8 | dword tail; |
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| 9 | dword currentIndex; |
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| 10 | |||
| 11 | void init(); |
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| 12 | bool isEmpty(); |
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| 13 | |||
| 14 | void saveCurrentState(); |
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| 15 | void restoreState(dword index); |
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| 16 | |||
| 17 | void undoLastAction(); |
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| 18 | void redoLastAction(); |
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| 19 | }; |
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| 20 | |||
| 21 | void _ActionsHistory::init() { |
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| 22 | dword i; |
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| 23 | |||
| 24 | head = tail = 0; |
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| 25 | currentIndex = -1; |
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| 26 | |||
| 27 | for (i = 0; i < MAX_ACTIONS_COUNT; i++) |
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| 28 | stack[i] = malloc(image.columns * image.rows); |
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| 29 | |||
| 30 | saveCurrentState(); |
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| 31 | } |
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| 32 | |||
| 33 | bool _ActionsHistory::isEmpty() { |
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| 34 | if (head == tail) |
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| 35 | return true; |
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| 36 | else |
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| 37 | return false; |
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| 38 | } |
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| 39 | |||
| 40 | void _ActionsHistory::saveCurrentState() { |
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| 41 | dword addr, offset; |
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| 42 | int r, c; |
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| 43 | |||
| 44 | tail = currentIndex + 1; |
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| 45 | |||
| 46 | if (tail >= MAX_ACTIONS_COUNT) |
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| 47 | tail = tail % MAX_ACTIONS_COUNT; |
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| 48 | |||
| 49 | addr = stack[tail]; |
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| 50 | |||
| 51 | for (r = 0; r < image.rows; r++) |
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| 52 | { |
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| 53 | for (c = 0; c < image.columns; c++) |
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| 54 | { |
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| 55 | offset = calc(image.columns * r + c) * 4; |
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| 56 | |||
| 57 | ESDWORD[addr + offset] = image.get_pixel(r, c); |
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| 58 | } |
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| 59 | } |
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| 60 | |||
| 61 | currentIndex = tail; |
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| 62 | tail = calc(tail + 1) % 10; |
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| 63 | |||
| 64 | if (tail == head) |
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| 65 | head = calc(head + 1) % 10; |
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| 66 | } |
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| 67 | |||
| 68 | void _ActionsHistory::restoreState(dword index) { |
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| 69 | dword addr, offset; |
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| 70 | int r, c; |
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| 71 | |||
| 72 | addr = stack[index]; |
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| 73 | |||
| 74 | for (r = 0; r < image.rows; r++) |
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| 75 | { |
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| 76 | for (c = 0; c < image.columns; c++) |
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| 77 | { |
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| 78 | offset = calc(image.columns * r + c) * 4; |
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| 79 | image.set_pixel(r, c, ESDWORD[addr + offset]); |
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| 80 | } |
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| 81 | } |
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| 82 | } |
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| 83 | |||
| 84 | void _ActionsHistory::undoLastAction() { |
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| 85 | dword previousAction; |
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| 86 | |||
| 87 | // Если вышли за левую границу, перемещаемся в конец массива |
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| 88 | if (currentIndex == 0) { |
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| 89 | previousAction = MAX_ACTIONS_COUNT - 1; |
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| 90 | } |
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| 91 | else { |
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| 92 | previousAction = currentIndex - 1; |
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| 93 | } |
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| 94 | |||
| 95 | if (isEmpty()) |
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| 96 | return; |
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| 97 | else { |
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| 98 | if (currentIndex != head) { |
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| 99 | restoreState(previousAction); |
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| 100 | DrawCanvas(); |
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| 101 | } |
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| 102 | |||
| 103 | if (currentIndex != head) |
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| 104 | currentIndex = previousAction; |
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| 105 | } |
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| 106 | } |
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| 107 | |||
| 108 | void _ActionsHistory::redoLastAction() { |
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| 109 | dword nextAction = calc(currentIndex + 1); |
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| 110 | |||
| 111 | // Если вышли за левую границу, возвращаемся в начало |
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| 112 | if (nextAction >= MAX_ACTIONS_COUNT) |
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| 113 | nextAction = nextAction % MAX_ACTIONS_COUNT; |
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| 114 | |||
| 115 | if (isEmpty()) |
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| 116 | return; |
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| 117 | else { |
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| 118 | if (nextAction != tail) { |
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| 119 | restoreState(nextAction); |
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| 120 | DrawCanvas(); |
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| 121 | } |
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| 122 | |||
| 123 | if (nextAction != tail) |
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| 124 | currentIndex = nextAction; |
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| 125 | } |
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| 126 | } |