base/applications/mspaint/history.c

   1 /*
   2  * PROJECT:     PAINT for ReactOS
   3  * LICENSE:     LGPL
   4  * FILE:        base/applications/paint/history.c
   5  * PURPOSE:     Undo and redo functionality
   6  * PROGRAMMERS: Benedikt Freisen
   7  */
   8
   9 /* INCLUDES *********************************************************/
  10
  11 #include "precomp.h"
  12
  13 /* FUNCTIONS ********************************************************/
  14
  15 extern void updateCanvasAndScrollbars(void);
  16
  17 void
  18 setImgXYRes(int x, int y)
  19 {
  20     if ((imgXRes != x) || (imgYRes != y))
  21     {
  22         imgXRes = x;
  23         imgYRes = y;
  24         updateCanvasAndScrollbars();
  25     }
  26 }
  27
  28 void
  29 newReversible()
  30 {
  31     DeleteObject(hBms[(currInd + 1) % HISTORYSIZE]);
  32     hBms[(currInd + 1) % HISTORYSIZE] = CopyImage(hBms[currInd], IMAGE_BITMAP, 0, 0, LR_COPYRETURNORG);
  33     currInd = (currInd + 1) % HISTORYSIZE;
  34     if (undoSteps < HISTORYSIZE - 1)
  35         undoSteps++;
  36     redoSteps = 0;
  37     SelectObject(hDrawingDC, hBms[currInd]);
  38     imgXRes = GetDIBWidth(hBms[currInd]);
  39     imgYRes = GetDIBHeight(hBms[currInd]);
  40     imageSaved = FALSE;
  41 }
  42
  43 void
  44 undo()
  45 {
  46     if (undoSteps > 0)
  47     {
  48         ShowWindow(hSelection, SW_HIDE);
  49         currInd = (currInd + HISTORYSIZE - 1) % HISTORYSIZE;
  50         SelectObject(hDrawingDC, hBms[currInd]);
  51         undoSteps--;
  52         if (redoSteps < HISTORYSIZE - 1)
  53             redoSteps++;
  54         setImgXYRes(GetDIBWidth(hBms[currInd]), GetDIBHeight(hBms[currInd]));
  55     }
  56 }
  57
  58 void
  59 redo()
  60 {
  61     if (redoSteps > 0)
  62     {
  63         ShowWindow(hSelection, SW_HIDE);
  64         currInd = (currInd + 1) % HISTORYSIZE;
  65         SelectObject(hDrawingDC, hBms[currInd]);
  66         redoSteps--;
  67         if (undoSteps < HISTORYSIZE - 1)
  68             undoSteps++;
  69         setImgXYRes(GetDIBWidth(hBms[currInd]), GetDIBHeight(hBms[currInd]));
  70     }
  71 }
  72
  73 void
  74 resetToU1()
  75 {
  76     DeleteObject(hBms[currInd]);
  77     hBms[currInd] =
  78         CopyImage(hBms[(currInd + HISTORYSIZE - 1) % HISTORYSIZE], IMAGE_BITMAP, 0, 0, LR_COPYRETURNORG);
  79     SelectObject(hDrawingDC, hBms[currInd]);
  80     imgXRes = GetDIBWidth(hBms[currInd]);
  81     imgYRes = GetDIBHeight(hBms[currInd]);
  82 }
  83
  84 void
  85 clearHistory()
  86 {
  87     undoSteps = 0;
  88     redoSteps = 0;
  89 }
  90
  91 void
  92 insertReversible(HBITMAP hbm)
  93 {
  94     DeleteObject(hBms[(currInd + 1) % HISTORYSIZE]);
  95     hBms[(currInd + 1) % HISTORYSIZE] = hbm;
  96     currInd = (currInd + 1) % HISTORYSIZE;
  97     if (undoSteps < HISTORYSIZE - 1)
  98         undoSteps++;
  99     redoSteps = 0;
 100     SelectObject(hDrawingDC, hBms[currInd]);
 101     setImgXYRes(GetDIBWidth(hBms[currInd]), GetDIBHeight(hBms[currInd]));
 102 }
 103
 104 void
 105 cropReversible(int width, int height, int xOffset, int yOffset)
 106 {
 107     HDC hdc;
 108     HPEN oldPen;
 109     HBRUSH oldBrush;
 110
 111     SelectObject(hDrawingDC, hBms[currInd]);
 112     DeleteObject(hBms[(currInd + 1) % HISTORYSIZE]);
 113     hBms[(currInd + 1) % HISTORYSIZE] = CreateDIBWithProperties(width, height);
 114     currInd = (currInd + 1) % HISTORYSIZE;
 115     if (undoSteps < HISTORYSIZE - 1)
 116         undoSteps++;
 117     redoSteps = 0;
 118
 119     hdc = CreateCompatibleDC(hDrawingDC);
 120     SelectObject(hdc, hBms[currInd]);
 121
 122     oldPen = SelectObject(hdc, CreatePen(PS_SOLID, 1, bgColor));
 123     oldBrush = SelectObject(hdc, CreateSolidBrush(bgColor));
 124     Rectangle(hdc, 0, 0, width, height);
 125     BitBlt(hdc, -xOffset, -yOffset, imgXRes, imgYRes, hDrawingDC, 0, 0, SRCCOPY);
 126     DeleteObject(SelectObject(hdc, oldBrush));
 127     DeleteObject(SelectObject(hdc, oldPen));
 128     DeleteDC(hdc);
 129     SelectObject(hDrawingDC, hBms[currInd]);
 130
 131     setImgXYRes(width, height);
 132 }