reactos/base/applications/paint/history.c

   1 /*
   2  * PROJECT:     PAINT for ReactOS
   3  * LICENSE:     LGPL
   4  * FILE:        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 void 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 newReversible()
  29 {
  30     DeleteObject(hBms[(currInd+1)%4]);
  31     hBms[(currInd+1)%4] = CopyImage( hBms[currInd], IMAGE_BITMAP, 0, 0, LR_COPYRETURNORG);
  32     currInd = (currInd+1)%4;
  33     if (undoSteps<3) undoSteps++;
  34     redoSteps = 0;
  35     SelectObject(hDrawingDC, hBms[currInd]);
  36     imgXRes = GetDIBWidth(hBms[currInd]);
  37     imgYRes = GetDIBHeight(hBms[currInd]);
  38 }
  39
  40 void undo()
  41 {
  42     if (undoSteps>0)
  43     {
  44         ShowWindow(hSelection, SW_HIDE);
  45         currInd = (currInd+3)%4;
  46         SelectObject(hDrawingDC, hBms[currInd]);
  47         undoSteps--;
  48         if (redoSteps<3) redoSteps++;
  49         setImgXYRes(GetDIBWidth(hBms[currInd]), GetDIBHeight(hBms[currInd]));
  50     }
  51 }
  52
  53 void redo()
  54 {
  55     if (redoSteps>0)
  56     {
  57         ShowWindow(hSelection, SW_HIDE);
  58         currInd = (currInd+1)%4;
  59         SelectObject(hDrawingDC, hBms[currInd]);
  60         redoSteps--;
  61         if (undoSteps<3) undoSteps++;
  62         setImgXYRes(GetDIBWidth(hBms[currInd]), GetDIBHeight(hBms[currInd]));
  63     }
  64 }
  65
  66 void resetToU1()
  67 {
  68     DeleteObject(hBms[currInd]);
  69     hBms[currInd] = CopyImage( hBms[(currInd+3)%4], IMAGE_BITMAP, 0, 0, LR_COPYRETURNORG);
  70     SelectObject(hDrawingDC, hBms[currInd]);
  71     imgXRes = GetDIBWidth(hBms[currInd]);
  72     imgYRes = GetDIBHeight(hBms[currInd]);
  73 }
  74
  75 void clearHistory()
  76 {
  77     undoSteps = 0;
  78     redoSteps = 0;
  79 }
  80
  81 void insertReversible(HBITMAP hbm)
  82 {
  83     DeleteObject(hBms[(currInd+1)%4]);
  84     hBms[(currInd+1)%4] = hbm;
  85     currInd = (currInd+1)%4;
  86     if (undoSteps<3) undoSteps++;
  87     redoSteps = 0;
  88     SelectObject(hDrawingDC, hBms[currInd]);
  89     setImgXYRes(GetDIBWidth(hBms[currInd]), GetDIBHeight(hBms[currInd]));
  90 }
  91
  92 void cropReversible(int x, int y)
  93 {
  94     SelectObject(hDrawingDC, hBms[currInd]);
  95     DeleteObject(hBms[(currInd+1)%4]);
  96     hBms[(currInd+1)%4] = CreateDIBWithProperties(x, y);
  97     currInd = (currInd+1)%4;
  98     if (undoSteps<3) undoSteps++;
  99     redoSteps = 0;
 100
 101     HBITMAP oldBitmap = SelectObject(hSelDC, hBms[currInd]);
 102     HPEN oldPen = SelectObject(hSelDC, CreatePen(PS_SOLID, 1, bgColor));
 103     HBRUSH oldBrush = SelectObject(hSelDC, CreateSolidBrush(bgColor));
 104     Rectangle(hSelDC, 0, 0, x, y);
 105     DeleteObject(SelectObject(hSelDC, oldBrush));
 106     DeleteObject(SelectObject(hSelDC, oldPen));
 107     BitBlt(hDrawingDC, 0, 0, imgXRes, imgYRes, hSelDC, 0, 0, SRCCOPY);
 108     SelectObject(hDrawingDC, SelectObject(hSelDC, oldBitmap));
 109
 110     setImgXYRes(x, y);
 111 }