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- /*----------------------------------------------
- SHOWDIB2.C -- Shows a DIB in the client area
- (c) Charles Petzold, 1998
- ----------------------------------------------*/
-
- #include <windows.h>
- #include "dibfile.h"
- #include "resource.h"
-
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
-
- TCHAR szAppName[] = TEXT ("ShowDib2") ;
-
- int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
- PSTR szCmdLine, int iCmdShow)
- {
- HACCEL hAccel ;
- HWND hwnd ;
- MSG msg ;
- WNDCLASS wndclass ;
-
- wndclass.style = CS_HREDRAW | CS_VREDRAW ;
- wndclass.lpfnWndProc = WndProc ;
- wndclass.cbClsExtra = 0 ;
- wndclass.cbWndExtra = 0 ;
- wndclass.hInstance = hInstance ;
- wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
- wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
- wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
- wndclass.lpszMenuName = szAppName ;
- wndclass.lpszClassName = szAppName ;
-
- if (!RegisterClass (&wndclass))
- {
- MessageBox (NULL, TEXT ("This program requires Windows NT!"),
- szAppName, MB_ICONERROR) ;
- return 0 ;
- }
-
- hwnd = CreateWindow (szAppName, TEXT ("Show DIB #2"),
- WS_OVERLAPPEDWINDOW,
- CW_USEDEFAULT, CW_USEDEFAULT,
- CW_USEDEFAULT, CW_USEDEFAULT,
- NULL, NULL, hInstance, NULL) ;
-
- ShowWindow (hwnd, iCmdShow) ;
- UpdateWindow (hwnd) ;
-
- hAccel = LoadAccelerators (hInstance, szAppName) ;
-
- while (GetMessage (&msg, NULL, 0, 0))
- {
- if (!TranslateAccelerator (hwnd, hAccel, &msg))
- {
- TranslateMessage (&msg) ;
- DispatchMessage (&msg) ;
- }
- }
- return msg.wParam ;
- }
-
- int ShowDib (HDC hdc, BITMAPINFO * pbmi, BYTE * pBits, int cxDib, int cyDib,
- int cxClient, int cyClient, WORD wShow)
- {
- switch (wShow)
- {
- case IDM_SHOW_NORMAL:
- return SetDIBitsToDevice (hdc, 0, 0, cxDib, cyDib, 0, 0,
- 0, cyDib, pBits, pbmi, DIB_RGB_COLORS) ;
-
- case IDM_SHOW_CENTER:
- return SetDIBitsToDevice (hdc, (cxClient - cxDib) / 2,
- (cyClient - cyDib) / 2,
- cxDib, cyDib, 0, 0,
- 0, cyDib, pBits, pbmi, DIB_RGB_COLORS) ;
-
- case IDM_SHOW_STRETCH:
- SetStretchBltMode (hdc, COLORONCOLOR) ;
-
- return StretchDIBits (hdc, 0, 0, cxClient, cyClient,
- 0, 0, cxDib, cyDib,
- pBits, pbmi, DIB_RGB_COLORS, SRCCOPY) ;
-
- case IDM_SHOW_ISOSTRETCH:
- SetStretchBltMode (hdc, COLORONCOLOR) ;
- SetMapMode (hdc, MM_ISOTROPIC) ;
- SetWindowExtEx (hdc, cxDib, cyDib, NULL) ;
- SetViewportExtEx (hdc, cxClient, cyClient, NULL) ;
- SetWindowOrgEx (hdc, cxDib / 2, cyDib / 2, NULL) ;
- SetViewportOrgEx (hdc, cxClient / 2, cyClient / 2, NULL) ;
-
- return StretchDIBits (hdc, 0, 0, cxDib, cyDib,
- 0, 0, cxDib, cyDib,
- pBits, pbmi, DIB_RGB_COLORS, SRCCOPY) ;
- }
- return 0 ;
- }
-
- LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static BITMAPFILEHEADER * pbmfh ;
- static BITMAPINFO * pbmi ;
- static BYTE * pBits ;
- static DOCINFO di = { sizeof (DOCINFO),
- TEXT ("ShowDib2: Printing") } ;
- static int cxClient, cyClient, cxDib, cyDib ;
- static PRINTDLG printdlg = { sizeof (PRINTDLG) } ;
- static TCHAR szFileName [MAX_PATH], szTitleName [MAX_PATH] ;
- static WORD wShow = IDM_SHOW_NORMAL ;
- BOOL bSuccess ;
- HDC hdc, hdcPrn ;
- HGLOBAL hGlobal ;
- HMENU hMenu ;
- int cxPage, cyPage, iEnable ;
- PAINTSTRUCT ps ;
- BYTE * pGlobal ;
-
- switch (message)
- {
- case WM_CREATE:
- DibFileInitialize (hwnd) ;
- return 0 ;
-
- case WM_SIZE:
- cxClient = LOWORD (lParam) ;
- cyClient = HIWORD (lParam) ;
- return 0 ;
-
- case WM_INITMENUPOPUP:
- hMenu = GetMenu (hwnd) ;
-
- if (pbmfh)
- iEnable = MF_ENABLED ;
- else
- iEnable = MF_GRAYED ;
-
- EnableMenuItem (hMenu, IDM_FILE_SAVE, iEnable) ;
- EnableMenuItem (hMenu, IDM_FILE_PRINT, iEnable) ;
- EnableMenuItem (hMenu, IDM_EDIT_CUT, iEnable) ;
- EnableMenuItem (hMenu, IDM_EDIT_COPY, iEnable) ;
- EnableMenuItem (hMenu, IDM_EDIT_DELETE, iEnable) ;
- return 0 ;
-
- case WM_COMMAND:
- hMenu = GetMenu (hwnd) ;
-
- switch (LOWORD (wParam))
- {
- case IDM_FILE_OPEN:
- // Show the File Open dialog box
-
- if (!DibFileOpenDlg (hwnd, szFileName, szTitleName))
- return 0 ;
-
- // If there's an existing DIB, free the memory
-
- if (pbmfh)
- {
- free (pbmfh) ;
- pbmfh = NULL ;
- }
- // Load the entire DIB into memory
-
- SetCursor (LoadCursor (NULL, IDC_WAIT)) ;
- ShowCursor (TRUE) ;
-
- pbmfh = DibLoadImage (szFileName) ;
-
- ShowCursor (FALSE) ;
- SetCursor (LoadCursor (NULL, IDC_ARROW)) ;
-
- // Invalidate the client area for later update
-
- InvalidateRect (hwnd, NULL, TRUE) ;
-
- if (pbmfh == NULL)
- {
- MessageBox (hwnd, TEXT ("Cannot load DIB file"),
- szAppName, MB_ICONEXCLAMATION | MB_OK) ;
- return 0 ;
- }
- // Get pointers to the info structure & the bits
-
- pbmi = (BITMAPINFO *) (pbmfh + 1) ;
- pBits = (BYTE *) pbmfh + pbmfh->bfOffBits ;
-
- // Get the DIB width and height
-
- if (pbmi->bmiHeader.biSize == sizeof (BITMAPCOREHEADER))
- {
- cxDib = ((BITMAPCOREHEADER *) pbmi)->bcWidth ;
- cyDib = ((BITMAPCOREHEADER *) pbmi)->bcHeight ;
- }
- else
- {
- cxDib = pbmi->bmiHeader.biWidth ;
- cyDib = abs (pbmi->bmiHeader.biHeight) ;
- }
- return 0 ;
-
- case IDM_FILE_SAVE:
- // Show the File Save dialog box
-
- if (!DibFileSaveDlg (hwnd, szFileName, szTitleName))
- return 0 ;
-
- // Save the DIB to a disk file
-
- SetCursor (LoadCursor (NULL, IDC_WAIT)) ;
- ShowCursor (TRUE) ;
-
- bSuccess = DibSaveImage (szFileName, pbmfh) ;
-
- ShowCursor (FALSE) ;
- SetCursor (LoadCursor (NULL, IDC_ARROW)) ;
-
- if (!bSuccess)
- MessageBox (hwnd, TEXT ("Cannot save DIB file"),
- szAppName, MB_ICONEXCLAMATION | MB_OK) ;
- return 0 ;
-
- case IDM_FILE_PRINT:
- if (!pbmfh)
- return 0 ;
-
- // Get printer DC
-
- printdlg.Flags = PD_RETURNDC | PD_NOPAGENUMS | PD_NOSELECTION ;
-
- if (!PrintDlg (&printdlg))
- return 0 ;
-
- if (NULL == (hdcPrn = printdlg.hDC))
- {
- MessageBox (hwnd, TEXT ("Cannot obtain Printer DC"),
- szAppName, MB_ICONEXCLAMATION | MB_OK) ;
- return 0 ;
- }
- // Check if the printer can print bitmaps
-
- if (!(RC_BITBLT & GetDeviceCaps (hdcPrn, RASTERCAPS)))
- {
- DeleteDC (hdcPrn) ;
- MessageBox (hwnd, TEXT ("Printer cannot print bitmaps"),
- szAppName, MB_ICONEXCLAMATION | MB_OK) ;
- return 0 ;
- }
- // Get size of printable area of page
-
- cxPage = GetDeviceCaps (hdcPrn, HORZRES) ;
- cyPage = GetDeviceCaps (hdcPrn, VERTRES) ;
-
- bSuccess = FALSE ;
-
- // Send the DIB to the printer
-
- SetCursor (LoadCursor (NULL, IDC_WAIT)) ;
- ShowCursor (TRUE) ;
-
- if ((StartDoc (hdcPrn, &di) > 0) && (StartPage (hdcPrn) > 0))
- {
- ShowDib (hdcPrn, pbmi, pBits, cxDib, cyDib,
- cxPage, cyPage, wShow) ;
-
- if (EndPage (hdcPrn) > 0)
- {
- bSuccess = TRUE ;
- EndDoc (hdcPrn) ;
- }
- }
- ShowCursor (FALSE) ;
- SetCursor (LoadCursor (NULL, IDC_ARROW)) ;
-
- DeleteDC (hdcPrn) ;
-
- if (!bSuccess)
- MessageBox (hwnd, TEXT ("Could not print bitmap"),
- szAppName, MB_ICONEXCLAMATION | MB_OK) ;
- return 0 ;
-
- case IDM_EDIT_COPY:
- case IDM_EDIT_CUT:
- if (!pbmfh)
- return 0 ;
-
- // Make a copy of the packed DIB
-
- hGlobal = GlobalAlloc (GHND | GMEM_SHARE, pbmfh->bfSize -
- sizeof (BITMAPFILEHEADER)) ;
-
- pGlobal = GlobalLock (hGlobal) ;
-
- CopyMemory (pGlobal, (BYTE *) pbmfh + sizeof (BITMAPFILEHEADER),
- pbmfh->bfSize - sizeof (BITMAPFILEHEADER)) ;
-
- GlobalUnlock (hGlobal) ;
-
- // Transfer it to the clipboard
-
- OpenClipboard (hwnd) ;
- EmptyClipboard () ;
- SetClipboardData (CF_DIB, hGlobal) ;
- CloseClipboard () ;
-
- if (LOWORD (wParam) == IDM_EDIT_COPY)
- return 0 ;
- // fall through if IDM_EDIT_CUT
- case IDM_EDIT_DELETE:
- if (pbmfh)
- {
- free (pbmfh) ;
- pbmfh = NULL ;
- InvalidateRect (hwnd, NULL, TRUE) ;
- }
- return 0 ;
-
- case IDM_SHOW_NORMAL:
- case IDM_SHOW_CENTER:
- case IDM_SHOW_STRETCH:
- case IDM_SHOW_ISOSTRETCH:
- CheckMenuItem (hMenu, wShow, MF_UNCHECKED) ;
- wShow = LOWORD (wParam) ;
- CheckMenuItem (hMenu, wShow, MF_CHECKED) ;
- InvalidateRect (hwnd, NULL, TRUE) ;
- return 0 ;
- }
- break ;
-
- case WM_PAINT:
- hdc = BeginPaint (hwnd, &ps) ;
-
- if (pbmfh)
- ShowDib (hdc, pbmi, pBits, cxDib, cyDib,
- cxClient, cyClient, wShow) ;
-
- EndPaint (hwnd, &ps) ;
- return 0 ;
-
- case WM_DESTROY:
- if (pbmfh)
- free (pbmfh) ;
-
- PostQuitMessage (0) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }