dibit.c

dib bmp source code

/**************************************************************************** 
    PROGRAM: dibit.c

    PURPOSE: dibit template for Windows applications

    FUNCTIONS:

	WinMain() - calls initialization function, processes message loop
	InitApplication() - initializes window data and registers window
	InitInstance() - saves instance handle and creates main window
	MainWndProc() - processes messages
	About() - processes messages for "About" dialog box

    COMMENTS:

        Windows can have several copies of your application running at the
        same time.  The variable hInst keeps track of which instance this
        application is so that processing will be to the correct window.

****************************************************************************/

#include "windows.h"		    /* required for all Windows applications */
#include "dibit.h"		    /* specific to this program		     */
#include "commdlg.h"

HANDLE hInst;			    /* current instance			     */

char achFileName[128];
char str[255];

WORD wOperation = IDM_SETDIB;	/* default to SetDIBits() */
BOOL bDIBLoaded = FALSE;	/* initially no DIB is loaded */
WORD offBits;			/* offset to the bits */
HANDLE hDIBInfo = NULL;		/* the DIB header */
HBITMAP hDDBitmap = NULL;	/* a device dependent copy of the DIB */
HBITMAP hOldBitmap;
HDC hMemDC;

WORD wPalOp = 0;		/* default to no palette stuff */
HPALETTE hPalette = NULL;	/* palette used for display */
HANDLE hPalHeader = NULL;	/* DIB header with indices for color table */

void PASCAL NEAR PaintDIB(HWND);
DWORD PASCAL lread (int, VOID far *, DWORD);
HPALETTE PASCAL NEAR MakeDIBPalette(LPBITMAPINFOHEADER);
HANDLE PASCAL NEAR MakeIndexHeader(LPBITMAPINFOHEADER);
int InitDIB(HWND);

/****************************************************************************

    FUNCTION: WinMain(HANDLE, HANDLE, LPSTR, int)

    PURPOSE: calls initialization function, processes message loop

    COMMENTS:

        Windows recognizes this function by name as the initial entry point 
        for the program.  This function calls the application initialization 
        routine, if no other instance of the program is running, and always 
        calls the instance initialization routine.  It then executes a message 
        retrieval and dispatch loop that is the top-level control structure 
        for the remainder of execution.  The loop is terminated when a WM_QUIT 
        message is received, at which time this function exits the application 
        instance by returning the value passed by PostQuitMessage(). 

        If this function must abort before entering the message loop, it 
        returns the conventional value NULL.  

****************************************************************************/

int PASCAL WinMain(hInstance, hPrevInstance, lpCmdLine, nCmdShow)
HANDLE hInstance;			     /* current instance	     */
HANDLE hPrevInstance;			     /* previous instance	     */
LPSTR lpCmdLine;			     /* command line		     */
int nCmdShow;				     /* show-window type (open/icon) */
{
    MSG msg;				     /* message			     */

    if (!hPrevInstance)			 /* Other instances of app running? */
	if (!InitApplication(hInstance)) /* Initialize shared things */
	    return (FALSE);		 /* Exits if unable to initialize     */

    /* Perform initializations that apply to a specific instance */

    if (!InitInstance(hInstance, nCmdShow))
        return (FALSE);

    /* Acquire and dispatch messages until a WM_QUIT message is received. */

    while (GetMessage(&msg,	   /* message structure			     */
	    NULL,		   /* handle of window receiving the message */
	    NULL,		   /* lowest message to examine		     */
	    NULL))		   /* highest message to examine	     */
	{
	TranslateMessage(&msg);	   /* Translates virtual key codes	     */
	DispatchMessage(&msg);	   /* Dispatches message to window	     */
    }
    return (msg.wParam);	   /* Returns the value from PostQuitMessage */
}


/****************************************************************************

    FUNCTION: InitApplication(HANDLE)

    PURPOSE: Initializes window data and registers window class

    COMMENTS:

        This function is called at initialization time only if no other 
        instances of the application are running.  This function performs 
        initialization tasks that can be done once for any number of running 
        instances.  

        In this case, we initialize a window class by filling out a data 
        structure of type WNDCLASS and calling the Windows RegisterClass() 
        function.  Since all instances of this application use the same window 
        class, we only need to do this when the first instance is initialized.  


****************************************************************************/

BOOL InitApplication(hInstance)
HANDLE hInstance;			       /* current instance	     */
{
    WNDCLASS  wc;

    /* Fill in window class structure with parameters that describe the       */
    /* main window.                                                           */

    wc.style = NULL;                    /* Class style(s).                    */
    wc.lpfnWndProc = MainWndProc;       /* Function to retrieve messages for  */
                                        /* windows of this class.             */
    wc.cbClsExtra = 0;                  /* No per-class extra data.           */
    wc.cbWndExtra = 0;                  /* No per-window extra data.          */
    wc.hInstance = hInstance;           /* Application that owns the class.   */
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = COLOR_WINDOW+1;
    wc.lpszMenuName =  "dibitMenu";   /* Name of menu resource in .RC file. */
    wc.lpszClassName = "dibitWClass"; /* Name used in call to CreateWindow. */

    /* Register the window class and return success/failure code. */

    return (RegisterClass(&wc));
}


/****************************************************************************

    FUNCTION:  InitInstance(HANDLE, int)

    PURPOSE:  Saves instance handle and creates main window

    COMMENTS:

        This function is called at initialization time for every instance of 
        this application.  This function performs initialization tasks that 
        cannot be shared by multiple instances.  

        In this case, we save the instance handle in a static variable and 
        create and display the main program window.  
        
****************************************************************************/

BOOL InitInstance(hInstance, nCmdShow)
    HANDLE          hInstance;          /* Current instance identifier.       */
    int             nCmdShow;           /* Param for first ShowWindow() call. */
{
    HWND            hWnd;               /* Main window handle.                */

    /* Save the instance handle in static variable, which will be used in  */
    /* many subsequence calls from this application to Windows.            */

    hInst = hInstance;

    /* Create a main window for this application instance.  */

    hWnd = CreateWindow(
        "dibitWClass",                /* See RegisterClass() call.          */
        "dibit Sample Application",   /* Text for window title bar.         */
        WS_OVERLAPPEDWINDOW,            /* Window style.                      */
        CW_USEDEFAULT,                  /* Default horizontal position.       */
        CW_USEDEFAULT,                  /* Default vertical position.         */
        CW_USEDEFAULT,                  /* Default width.                     */
        CW_USEDEFAULT,                  /* Default height.                    */
        NULL,                           /* Overlapped windows have no parent. */
        NULL,                           /* Use the window class menu.         */
        hInstance,                      /* This instance owns this window.    */
        NULL                            /* Pointer not needed.                */
    );

    /* If window could not be created, return "failure" */

    if (!hWnd)
        return (FALSE);

    /* Make the window visible; update its client area; and return "success" */

    ShowWindow(hWnd, nCmdShow);  /* Show the window                        */
    UpdateWindow(hWnd);          /* Sends WM_PAINT message                 */
    return (TRUE);               /* Returns the value from PostQuitMessage */

}

/****************************************************************************

    FUNCTION: MainWndProc(HWND, UINT, WPARAM, LPARAM)

    PURPOSE:  Processes messages

    MESSAGES:

	WM_COMMAND    - application menu (About dialog box)
	WM_DESTROY    - destroy window

    COMMENTS:

	To process the IDM_ABOUT message, call MakeProcInstance() to get the
	current instance address of the About() function.  Then call Dialog
	box which will create the box according to the information in your
	dibit.rc file and turn control over to the About() function.	When
	it returns, free the intance address.

****************************************************************************/

//long FAR PASCAL __export MainWndProc(hWnd, message, wParam, lParam)
LONG APIENTRY MainWndProc(hWnd, message, wParam, lParam)
HWND hWnd;				  /* window handle		     */
UINT message;			      /* type of message		 */
WPARAM wParam;				    /* additional information	       */
LPARAM lParam;				    /* additional information	       */
{
    FARPROC lpProcAbout;
    OPENFILENAME    ofn;

    switch (message) {
	case WM_CREATE:
	    hDIBInfo = GlobalAlloc(GMEM_MOVEABLE, 
	    		(DWORD)(sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD)));
	    break;

	case WM_INITMENU:
	    CheckMenuItem(wParam, wOperation, MF_CHECKED);
	    break;

	case WM_COMMAND:	   /* message: command from application menu */
	    switch(wParam) {
		case IDM_ABOUT:
		    lpProcAbout = MakeProcInstance(About, hInst);

		    DialogBox(hInst,		 /* current instance	     */
		        "AboutBox",			 /* resource to use	     */
		        hWnd,			 /* parent handle	     */
		        lpProcAbout);		 /* About() instance address */

		    FreeProcInstance(lpProcAbout);
		    break;

		case IDM_SETDIB:
		case IDM_TODEV:
		case IDM_STRETCH:
		    CheckMenuItem(GetMenu(hWnd), wOperation, MF_UNCHECKED);
		    wOperation = wParam;
		    CheckMenuItem(GetMenu(hWnd), wOperation, MF_CHECKED);
		    InvalidateRect(hWnd, NULL, TRUE);
		    break;

		case IDM_PALRGB:
		case IDM_PALIND:
		    if (wPalOp == wParam)	/* turning off palette use */
		    {
			CheckMenuItem(GetMenu(hWnd), wPalOp, MF_UNCHECKED);
			wPalOp = 0;

			/* since palette use is being turned off, 
			** any device-dependent bitmap we have created
			** is no longer valid for use.  free it up
			*/
			if (hDDBitmap)
			{
			    SelectObject(hMemDC, hOldBitmap);
			    DeleteDC(hMemDC);
			    DeleteObject(hDDBitmap);
			    hDDBitmap = NULL;
			}
		    }
		    else	/* changing palette use options */
		    {
			if (wPalOp)
			    CheckMenuItem(GetMenu(hWnd), wPalOp, MF_UNCHECKED);

			/* turning on palette use for the first time.
			** if we had a device-dependent bitmap, get rid
			** of it so that it will be rebuilt with palette.
			*/
			else if (hDDBitmap)
			{
			    SelectObject(hMemDC, hOldBitmap);
			    DeleteDC(hMemDC);
			    DeleteObject(hDDBitmap);
			    hDDBitmap = NULL;
			}
			wPalOp = wParam;
			CheckMenuItem(GetMenu(hWnd), wPalOp, MF_CHECKED);
		    }
		    InvalidateRect(hWnd, NULL, TRUE);
		    break;

                case IDM_OPEN:
		    ofn.lStructSize = sizeof(OPENFILENAME);
		    ofn.hwndOwner = hWnd;
		    ofn.lpstrFilter = NULL;
                    ofn.lpstrFilter = "Bitmaps (*.BMP)\0*.BMP\0";
		    ofn.lpstrCustomFilter = NULL;
		    ofn.nFilterIndex = 1;
		    achFileName[0] = 0;		/* pass in NULL */
		    ofn.lpstrFile = (LPSTR)achFileName;
		    ofn.nMaxFile = 128;
		    ofn.lpstrInitialDir = NULL;
		    ofn.lpstrTitle = NULL;
		    ofn.lpstrFileTitle = NULL;
            ofn.lpstrDefExt = NULL;
                    ofn.Flags = 0;

                    if (GetOpenFileName((LPOPENFILENAME)&ofn))
			if (InitDIB (hWnd))
			    InvalidateRect (hWnd, NULL, FALSE);
                    break;

		default:
		    return (DefWindowProc(hWnd, message, wParam, lParam));
	    }
	    break;

	/* if system palette change caused by someone else, force repaint */
	case WM_PALETTECHANGED:
	    if (wParam != hWnd && bDIBLoaded)
		InvalidateRect(hWnd, NULL, TRUE);
	    break;

	/* if doing stretching, resize the image */
	case WM_SIZE:
	    if (wOperation == IDM_STRETCH && bDIBLoaded)
		InvalidateRect(hWnd, NULL, TRUE);
	    break;

	case WM_PAINT:
	    if (!bDIBLoaded)		/* if no DIB loaded, nothing to draw */
		return (DefWindowProc(hWnd, message, wParam, lParam));
	    else
		PaintDIB(hWnd);
	    break;

	case WM_DESTROY:		  /* message: window being destroyed */
	    PostQuitMessage(0);
	    break;

	default:			  /* Passes it on if unproccessed    */
	    return (DefWindowProc(hWnd, message, wParam, lParam));
    }
    return (NULL);
}

/****************************************************************************
 *									    *
 *  FUNCTION   : MakeIndexHeader(lpInfo)				    *
 *									    *
 *  PURPOSE    : Given a BITMAPINFOHEADER, create a new info header 
 *		 using the DIB_PAL_COLORS format.
 *									    *
 *  RETURNS    : non-zero - global handle of a new header
 *		 zero - unable to create new header
 *									    *
 ****************************************************************************/
HANDLE PASCAL NEAR MakeIndexHeader(LPBITMAPINFOHEADER lpInfo)
{
    HANDLE hPalInfo;
    LPBITMAPINFOHEADER lpPalInfo;
    WORD FAR *lpTable;
    WORD i;

    if (lpInfo->biClrUsed)
    {
	hPalInfo = GlobalAlloc(GMEM_MOVEABLE, lpInfo->biSize +
					lpInfo->biClrUsed * sizeof(WORD));
	if (!hPalInfo)
	    return(NULL);
	lpPalInfo = (LPBITMAPINFOHEADER)GlobalLock(hPalInfo);

	*lpPalInfo = *lpInfo;
	lpTable = (WORD FAR *)((LPSTR)lpPalInfo + lpPalInfo->biSize);

        for (i = 0; i < (WORD)lpInfo->biClrUsed; i++)
	    *lpTable++ = i;

	GlobalUnlock(hPalInfo);
	return(hPalInfo);
    }
    else
	return(NULL);
}

/****************************************************************************
 *									    *
 *  FUNCTION   : MakeDIBPalette(lpInfo)					    *
 *									    *