ReactOS Development > Doxygen

00001 /*
00002  * PROJECT:     PAINT for ReactOS
00003  * LICENSE:     LGPL
00004  * FILE:        base/applications/paint/history.c
00005  * PURPOSE:     Undo and redo functionality
00006  * PROGRAMMERS: Benedikt Freisen
00007  */
00008 
00009 /* INCLUDES *********************************************************/
00010 
00011 #include "precomp.h"
00012 
00013 /* FUNCTIONS ********************************************************/
00014 
00015 extern void updateCanvasAndScrollbars(void);
00016 
00017 void
00018 setImgXYRes(int x, int y)
00019 {
00020     if ((imgXRes != x) || (imgYRes != y))
00021     {
00022         imgXRes = x;
00023         imgYRes = y;
00024         updateCanvasAndScrollbars();
00025     }
00026 }
00027 
00028 void
00029 newReversible()
00030 {
00031     DeleteObject(hBms[(currInd + 1) % HISTORYSIZE]);
00032     hBms[(currInd + 1) % HISTORYSIZE] = CopyImage(hBms[currInd], IMAGE_BITMAP, 0, 0, LR_COPYRETURNORG);
00033     currInd = (currInd + 1) % HISTORYSIZE;
00034     if (undoSteps < HISTORYSIZE - 1)
00035         undoSteps++;
00036     redoSteps = 0;
00037     SelectObject(hDrawingDC, hBms[currInd]);
00038     imgXRes = GetDIBWidth(hBms[currInd]);
00039     imgYRes = GetDIBHeight(hBms[currInd]);
00040     imageSaved = FALSE;
00041 }
00042 
00043 void
00044 undo()
00045 {
00046     if (undoSteps > 0)
00047     {
00048         ShowWindow(hSelection, SW_HIDE);
00049         currInd = (currInd + HISTORYSIZE - 1) % HISTORYSIZE;
00050         SelectObject(hDrawingDC, hBms[currInd]);
00051         undoSteps--;
00052         if (redoSteps < HISTORYSIZE - 1)
00053             redoSteps++;
00054         setImgXYRes(GetDIBWidth(hBms[currInd]), GetDIBHeight(hBms[currInd]));
00055     }
00056 }
00057 
00058 void
00059 redo()
00060 {
00061     if (redoSteps > 0)
00062     {
00063         ShowWindow(hSelection, SW_HIDE);
00064         currInd = (currInd + 1) % HISTORYSIZE;
00065         SelectObject(hDrawingDC, hBms[currInd]);
00066         redoSteps--;
00067         if (undoSteps < HISTORYSIZE - 1)
00068             undoSteps++;
00069         setImgXYRes(GetDIBWidth(hBms[currInd]), GetDIBHeight(hBms[currInd]));
00070     }
00071 }
00072 
00073 void
00074 resetToU1()
00075 {
00076     DeleteObject(hBms[currInd]);
00077     hBms[currInd] =
00078         CopyImage(hBms[(currInd + HISTORYSIZE - 1) % HISTORYSIZE], IMAGE_BITMAP, 0, 0, LR_COPYRETURNORG);
00079     SelectObject(hDrawingDC, hBms[currInd]);
00080     imgXRes = GetDIBWidth(hBms[currInd]);
00081     imgYRes = GetDIBHeight(hBms[currInd]);
00082 }
00083 
00084 void
00085 clearHistory()
00086 {
00087     undoSteps = 0;
00088     redoSteps = 0;
00089 }
00090 
00091 void
00092 insertReversible(HBITMAP hbm)
00093 {
00094     DeleteObject(hBms[(currInd + 1) % HISTORYSIZE]);
00095     hBms[(currInd + 1) % HISTORYSIZE] = hbm;
00096     currInd = (currInd + 1) % HISTORYSIZE;
00097     if (undoSteps < HISTORYSIZE - 1)
00098         undoSteps++;
00099     redoSteps = 0;
00100     SelectObject(hDrawingDC, hBms[currInd]);
00101     setImgXYRes(GetDIBWidth(hBms[currInd]), GetDIBHeight(hBms[currInd]));
00102 }
00103 
00104 void
00105 cropReversible(int width, int height, int xOffset, int yOffset)
00106 {
00107     HDC hdc;
00108     HPEN oldPen;
00109     HBRUSH oldBrush;
00110 
00111     SelectObject(hDrawingDC, hBms[currInd]);
00112     DeleteObject(hBms[(currInd + 1) % HISTORYSIZE]);
00113     hBms[(currInd + 1) % HISTORYSIZE] = CreateDIBWithProperties(width, height);
00114     currInd = (currInd + 1) % HISTORYSIZE;
00115     if (undoSteps < HISTORYSIZE - 1)
00116         undoSteps++;
00117     redoSteps = 0;
00118 
00119     hdc = CreateCompatibleDC(hDrawingDC);
00120     SelectObject(hdc, hBms[currInd]);
00121 
00122     oldPen = SelectObject(hdc, CreatePen(PS_SOLID, 1, bgColor));
00123     oldBrush = SelectObject(hdc, CreateSolidBrush(bgColor));
00124     Rectangle(hdc, 0, 0, width, height);
00125     BitBlt(hdc, -xOffset, -yOffset, imgXRes, imgYRes, hDrawingDC, 0, 0, SRCCOPY);
00126     DeleteObject(SelectObject(hdc, oldBrush));
00127     DeleteObject(SelectObject(hdc, oldPen));
00128     DeleteDC(hdc);
00129     SelectObject(hDrawingDC, hBms[currInd]);
00130 
00131     setImgXYRes(width, height);
00132 }
Generated on Fri May 25 2012 04:15:23 for ReactOS by
1.7.6.1