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 <windows.h>
  12 #include "globalvar.h"
  13 #include "dib.h"
  14 #include "definitions.h"
  15
  16 /* FUNCTIONS ********************************************************/
  17
  18 extern void updateCanvasAndScrollbars(void);
  19
  20 void
  21 setImgXYRes(int x, int y)
  22 {
  23     if ((imgXRes != x) || (imgYRes != y))
  24     {
  25         imgXRes = x;
  26         imgYRes = y;
  27         updateCanvasAndScrollbars();
  28     }
  29 }
  30
  31 void
  32 newReversible()
  33 {
  34     DeleteObject(hBms[(currInd + 1) % HISTORYSIZE]);
  35     hBms[(currInd + 1) % HISTORYSIZE] = CopyImage(hBms[currInd], IMAGE_BITMAP, 0, 0, LR_COPYRETURNORG);
  36     currInd = (currInd + 1) % HISTORYSIZE;
  37     if (undoSteps < HISTORYSIZE - 1)
  38         undoSteps++;
  39     redoSteps = 0;
  40     SelectObject(hDrawingDC, hBms[currInd]);
  41     imgXRes = GetDIBWidth(hBms[currInd]);
  42     imgYRes = GetDIBHeight(hBms[currInd]);
  43     imageSaved = FALSE;
  44 }
  45
  46 void
  47 undo()
  48 {
  49     if (undoSteps > 0)
  50     {
  51         ShowWindow(hSelection, SW_HIDE);
  52         currInd = (currInd + HISTORYSIZE - 1) % HISTORYSIZE;
  53         SelectObject(hDrawingDC, hBms[currInd]);
  54         undoSteps--;
  55         if (redoSteps < HISTORYSIZE - 1)
  56             redoSteps++;
  57         setImgXYRes(GetDIBWidth(hBms[currInd]), GetDIBHeight(hBms[currInd]));
  58     }
  59 }
  60
  61 void
  62 redo()
  63 {
  64     if (redoSteps > 0)
  65     {
  66         ShowWindow(hSelection, SW_HIDE);
  67         currInd = (currInd + 1) % HISTORYSIZE;
  68         SelectObject(hDrawingDC, hBms[currInd]);
  69         redoSteps--;
  70         if (undoSteps < HISTORYSIZE - 1)
  71             undoSteps++;
  72         setImgXYRes(GetDIBWidth(hBms[currInd]), GetDIBHeight(hBms[currInd]));
  73     }
  74 }
  75
  76 void
  77 resetToU1()
  78 {
  79     DeleteObject(hBms[currInd]);
  80     hBms[currInd] =
  81         CopyImage(hBms[(currInd + HISTORYSIZE - 1) % HISTORYSIZE], IMAGE_BITMAP, 0, 0, LR_COPYRETURNORG);
  82     SelectObject(hDrawingDC, hBms[currInd]);
  83     imgXRes = GetDIBWidth(hBms[currInd]);
  84     imgYRes = GetDIBHeight(hBms[currInd]);
  85 }
  86
  87 void
  88 clearHistory()
  89 {
  90     undoSteps = 0;
  91     redoSteps = 0;
  92 }
  93
  94 void
  95 insertReversible(HBITMAP hbm)
  96 {
  97     DeleteObject(hBms[(currInd + 1) % HISTORYSIZE]);
  98     hBms[(currInd + 1) % HISTORYSIZE] = hbm;
  99     currInd = (currInd + 1) % HISTORYSIZE;
 100     if (undoSteps < HISTORYSIZE - 1)
 101         undoSteps++;
 102     redoSteps = 0;
 103     SelectObject(hDrawingDC, hBms[currInd]);
 104     setImgXYRes(GetDIBWidth(hBms[currInd]), GetDIBHeight(hBms[currInd]));
 105 }
 106
 107 void
 108 cropReversible(int width, int height, int xOffset, int yOffset)
 109 {
 110     HDC hdc;
 111     HPEN oldPen;
 112     HBRUSH oldBrush;
 113
 114     SelectObject(hDrawingDC, hBms[currInd]);
 115     DeleteObject(hBms[(currInd + 1) % HISTORYSIZE]);
 116     hBms[(currInd + 1) % HISTORYSIZE] = CreateDIBWithProperties(width, height);
 117     currInd = (currInd + 1) % HISTORYSIZE;
 118     if (undoSteps < HISTORYSIZE - 1)
 119         undoSteps++;
 120     redoSteps = 0;
 121
 122     hdc = CreateCompatibleDC(hDrawingDC);
 123     SelectObject(hdc, hBms[currInd]);
 124
 125     oldPen = SelectObject(hdc, CreatePen(PS_SOLID, 1, bgColor));
 126     oldBrush = SelectObject(hdc, CreateSolidBrush(bgColor));
 127     Rectangle(hdc, 0, 0, width, height);
 128     BitBlt(hdc, -xOffset, -yOffset, imgXRes, imgYRes, hDrawingDC, 0, 0, SRCCOPY);
 129     DeleteObject(SelectObject(hdc, oldBrush));
 130     DeleteObject(SelectObject(hdc, oldPen));
 131     DeleteDC(hdc);
 132     SelectObject(hDrawingDC, hBms[currInd]);
 133
 134     setImgXYRes(width, height);
 135 }