126 lines
2.4 KiB
C
126 lines
2.4 KiB
C
// Actions history
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#define MAX_ACTIONS_COUNT 10
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struct _ActionsHistory {
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dword stack[MAX_ACTIONS_COUNT];
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dword head;
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dword tail;
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dword currentIndex;
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void init();
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bool isEmpty();
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void saveCurrentState();
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void restoreState(dword index);
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void undoLastAction();
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void redoLastAction();
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};
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void _ActionsHistory::init() {
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dword i;
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head = tail = 0;
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currentIndex = -1;
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for (i = 0; i < MAX_ACTIONS_COUNT; i++)
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stack[i] = malloc(image.columns * image.rows);
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saveCurrentState();
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}
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bool _ActionsHistory::isEmpty() {
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if (head == tail)
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return true;
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else
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return false;
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}
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void _ActionsHistory::saveCurrentState() {
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dword addr, offset;
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int r, c;
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tail = currentIndex + 1;
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if (tail >= MAX_ACTIONS_COUNT)
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tail = tail % MAX_ACTIONS_COUNT;
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addr = stack[tail];
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for (r = 0; r < image.rows; r++)
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{
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for (c = 0; c < image.columns; c++)
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{
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offset = calc(image.columns * r + c) * 4;
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ESDWORD[addr + offset] = image.get_pixel(r, c);
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}
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}
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currentIndex = tail;
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tail = calc(tail + 1) % 10;
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if (tail == head)
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head = calc(head + 1) % 10;
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}
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void _ActionsHistory::restoreState(dword index) {
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dword addr, offset;
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int r, c;
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addr = stack[index];
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for (r = 0; r < image.rows; r++)
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{
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for (c = 0; c < image.columns; c++)
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{
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offset = calc(image.columns * r + c) * 4;
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image.set_pixel(r, c, ESDWORD[addr + offset]);
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}
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}
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}
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void _ActionsHistory::undoLastAction() {
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dword previousAction;
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// Если вышли за левую границу, перемещаемся в конец массива
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if (currentIndex == 0) {
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previousAction = MAX_ACTIONS_COUNT - 1;
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}
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else {
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previousAction = currentIndex - 1;
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}
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if (isEmpty())
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return;
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else {
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if (currentIndex != head) {
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restoreState(previousAction);
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DrawCanvas();
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}
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if (currentIndex != head)
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currentIndex = previousAction;
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}
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}
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void _ActionsHistory::redoLastAction() {
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dword nextAction = calc(currentIndex + 1);
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// Если вышли за левую границу, возвращаемся в начало
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if (nextAction >= MAX_ACTIONS_COUNT)
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nextAction = nextAction % MAX_ACTIONS_COUNT;
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if (isEmpty())
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return;
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else {
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if (nextAction != tail) {
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restoreState(nextAction);
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DrawCanvas();
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}
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if (nextAction != tail)
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currentIndex = nextAction;
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}
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} |