/****************************************************************************/
/*                                                                          */
/*        DISPDIB.H - Include file for DisplayDib() function.               */
/*                                                                          */
/*        Note: You must include WINDOWS.H before including this file.      */
/*                                                                          */
/*        Copyright (c) 1990-1999, Microsoft Corp.  All rights reserved.    */
/*                                                                          */
/****************************************************************************/

#ifndef __DISPDIB_H__
#define __DISPDIB_H__

// DisplayDib() error return codes
#define DISPLAYDIB_NOERROR          0x0000  // success
#define DISPLAYDIB_NOTSUPPORTED     0x0001  // function not supported
#define DISPLAYDIB_INVALIDDIB       0x0002  // null or invalid DIB header
#define DISPLAYDIB_INVALIDFORMAT    0x0003  // invalid DIB format
#define DISPLAYDIB_INVALIDTASK      0x0004  // not called from current task
#define DISPLAYDIB_STOP             0x0005  // stop requested
#define DISPLAYDIB_NOTACTIVE	    0x0006  // DisplayDibWindow not foreground
#define DISPLAYDIB_BADSIZE          0x0007  //

// flags for <wFlags> parameter of DisplayDib()
#define DISPLAYDIB_NOPALETTE        0x0010  // don't set palette
#define DISPLAYDIB_NOCENTER         0x0020  // don't center image
#define DISPLAYDIB_NOWAIT           0x0040  // don't wait before returning
#define DISPLAYDIB_NOIMAGE          0x0080  // don't draw image
#define DISPLAYDIB_ZOOM2            0x0100  // stretch by 2
#define DISPLAYDIB_DONTLOCKTASK     0x0200  // don't lock current task
#define DISPLAYDIB_TEST             0x0400  // testing the command
#define DISPLAYDIB_NOFLIP           0x0800  // dont page flip
#define DISPLAYDIB_BEGIN            0x8000  // start of multiple calls
#define DISPLAYDIB_END              0x4000  // end of multiple calls

#define DISPLAYDIB_MODE             0x000F  // mask for display mode
#define DISPLAYDIB_MODE_DEFAULT     0x0000  // default display mode
#define DISPLAYDIB_MODE_320x200x8   0x0001  // 320-by-200
#define DISPLAYDIB_MODE_320x240x8   0x0005  // 320-by-240

//
// a Win32 app must use the window class the function
// versions are not available
//
#ifndef _WIN32

// function prototypes
UINT FAR PASCAL DisplayDib(LPBITMAPINFOHEADER lpbi, LPSTR lpBits, WORD wFlags);
UINT FAR PASCAL DisplayDibEx(LPBITMAPINFOHEADER lpbi, int x, int y, LPSTR lpBits, WORD wFlags);

#define DisplayDibBegin() DisplayDib(NULL, NULL, DISPLAYDIB_BEGIN|DISPDIB_NOWAIT)
#define DisplayDibEnd()   DisplayDib(NULL, NULL, DISPLAYDIB_END|DISPDIB_NOWAIT)

#endif

//
//  DisplayDibWindow class.
//
//  simple interface to DISPDIB as a window class.
//  draw images and create a fullscreen window in one easy step.
//
//  advantages over calling the APIs directly.
//
//      if you show the window it will handle enabling/disabling
//      fullscreen mode when it has a activation.
//
//      while in fullscreen mode, window will be sized to
//      cover entire display preventing other apps from getting
//      clicked on. (when visible)
//
//      if window looses activation, fullscreen mode will be disabled
//      DDM_DRAW will return DISPLAYDIB_NOTACTIVE if you try to draw
//
//      forwards all mouse and keyboard events to owner, easy way
//      to take over entire screen.
//
//      alows interop with a Win32 application (via WM_COPYDATA)
//      NOTE WM_COPYDATA does not actualy copy anything if the
//      window belongs to the calling thread.  it will do a copy
//      if the window is owned by another thread....
//
//  you can use a DisplayDibWindow in two ways.....
//
//      hidden window
//
//          if the window is hidden, you must use the
//          DDM_BEGIN and DDM_END message to enable/disable
//          fullscreen mode manualy when your app is activated deactivated.
//
//      visible toplevel window
//
//          if you show the window it will take over the entire screen
//          and forward all mouse/keyboard input to its owner.
//
//          it will enter fullscreen automaticly when it is shown.
//
//          it will leave fullscreen and hide it self it another app
//          grabs the focus.
//
//  class name:     "DisplayDibWindow"
//                  class is registered when DISPDIB.DLL is loaded.
//                  as a global class.
//
//  messages:
//
//      DDM_SETFMT  set new DIB format or program a new palette
//
//		    fullscreen mode, will use best mode
//                  for displaying the passed DIB format.
//		    defaul is 320x240x8 tripple buffered
//
//                  the palette will be programed with the color
//                  table of the passed BITMAPINFOHEADER.
//
//                  the format is a BITMAPINFOHEADER followed by a color table.
//
//                  you must set a format before doing a begin, end or draw
//                  you can set a 320x200 or a 320x24 mode by selecting
//                  a DIB of the format you want.
//
//                  if you do a setfmt while fullscreen mode is active only the
//                  the palette will be changed the new size (if any) wont
//                  happen until the next begin.
//
//	    wParam = 0
//          lParam = LPBITMAPINFOHEADER
//
//          returns 0 if success else DISPLAYDIB_* error code.
//
//      DDM_DRAW    draws DIB data to fullscreen
//                  format is assumed the same as format passed to
//                  DDM_BEGIN or DDM_FMT
//
//          wParam = flags
//          lParam = bits pointer.
//
//          returns 0 if success else DISPLAYDIB_* error code.
//
//      DDM_CLOSE   destroy window *and* free the DLL
//
//      DDM_BEGIN   enter DISPDIB mode.
//          wParam = flags
//          lParam = 0
//
//          returns 0 if success else DISPLAYDIB_* error code.
//
//      DDM_END     leave DISPDIB mode.
//          wParam = flags
//          lParam = 0
//
//          returns 0 if success else DISPLAYDIB_* error code.
//
//      WM_COPYDATA allows a Win32 app to send a DDM_ message, that requires
//      a pointer.
//
//          wParam = hwnd of sender
//          lParam = PCOPYDATASTRUCT
//                  dwData      - LOWORD: DDM_* message value.
//                  dwData      - HIWORD: wParam for message
//                  lpData      - lParam (pointer to a BITMAPINFOHEADER or bits)
//                  cbData      - size of data
//
//          returns   0 if success else DISPLAYDIB_* error code.
//

#define DISPLAYDIB_WINDOW_CLASS     "DisplayDibWindow"
#define DISPLAYDIB_DLL              "DISPDIB.DLL"

#define DDM_SETFMT      WM_USER+0
#define DDM_DRAW        WM_USER+1
#define DDM_CLOSE       WM_USER+2
#define DDM_BEGIN       WM_USER+3
#define DDM_END         WM_USER+4

//
// inline function to send a message to a DisplayDibWindow
//
__inline UINT DisplayDibWindowMessage(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam, DWORD cbSize)
{
#if defined(_WIN32) || defined(WIN32)
        COPYDATASTRUCT cds;
        cds.dwData = MAKELONG(msg, wParam);
        cds.cbData = lParam ? cbSize : 0;
        cds.lpData = (LPVOID)lParam;
        return (UINT)SendMessage(hwnd, WM_COPYDATA, (WPARAM)(HWND)NULL, (LPARAM)(LPVOID)&cds);
#else
        return (UINT)SendMessage(hwnd, msg, wParam, lParam);
#endif
}

//
// inline function to create a DisplayDibWindow
//
__inline HWND DisplayDibWindowCreateEx(HWND hwndParent, HINSTANCE hInstance, DWORD dwStyle)
{
#if defined(_WIN32) || defined(WIN32)
    DWORD show = 2;
    DWORD zero = 0;
    LPVOID params[4] = {NULL, &zero, &show, 0};

    if ((UINT)LoadModule(DISPLAYDIB_DLL, &params) < (UINT)HINSTANCE_ERROR)
        return NULL;    // loading DISPDIB did not work
#else
    if ((UINT)LoadLibrary(DISPLAYDIB_DLL) < (UINT)HINSTANCE_ERROR)
        return NULL;    // loading DISPDIB did not work
#endif

    return CreateWindow(DISPLAYDIB_WINDOW_CLASS,"",dwStyle,0, 0,
            GetSystemMetrics(SM_CXSCREEN),GetSystemMetrics(SM_CYSCREEN),
            hwndParent, NULL,
            (hInstance ? hInstance : GetWindowInstance(hwndParent)), NULL);
}

//
//  helper macros for a DisplayDibWindow
//
//  DisplayDibWindowCreate
//
//      used to create a toplevel WS_POPUP window.
//
//  DisplayDibWindowCreateEx
//
//      used to create a non-toplevel window, of a custom style.
//
//  DisplayDibWindowSetFmt
//
//      macro to send the DDM_SETFMT message.
//
//  DisplayDibWindowDraw
//
//      macro to send the DDM_DRAW message
//
//  DisplayDibWindowBegin
//
//      macro used to show the window
//
//  DisplayDibWindowEnd
//
//      macro used to hide the window
//
//  DisplayDibWindowBeginEx
//
//      macro used to send a DDM_BEGIN message, used with hidden windows
//
//  DisplayDibWindowEndEx
//
//      macro used to send a DDM_END message, used with hidden windows
//
//  DisplayDibWindowClose
//
//      macro used to send a DDM_CLOSE message
//      this will destroy the window and free the DLL.
//
//  NOTES
//      warning DisplayDibWindowBegin/End will show the DisplayDibWindow
//      this will steal actiation away from your app. all mouse keyboard
//      input will go to the dispdib window and it will forward it to
//      its owner (make sure you set the right owner on create)
//
//      this may cause a problem for your app, you can keep the window
//      hidden be using the DDM_BEGIN/END messages in this case.
//
#define DisplayDibWindowCreate(hwndP, hInstance)        DisplayDibWindowCreateEx(hwndP, hInstance, WS_POPUP)
#define DisplayDibWindowSetFmt(hwnd, lpbi)              DisplayDibWindowMessage(hwnd, DDM_SETFMT, 0, (LPARAM)(LPVOID)(lpbi), sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD))
#define DisplayDibWindowDraw(hwnd, flags, bits, size)   DisplayDibWindowMessage(hwnd, DDM_DRAW, (WPARAM)(UINT)(flags), (LPARAM)(LPVOID)(bits), (DWORD)(size))

#ifdef __cplusplus
#define DisplayDibWindowBegin(hwnd)                     ::ShowWindow(hwnd, SW_SHOWNORMAL)
#define DisplayDibWindowEnd(hwnd)                       ::ShowWindow(hwnd, SW_HIDE)
#define DisplayDibWindowBeginEx(hwnd, f)                ::SendMessage(hwnd, DDM_BEGIN, (WPARAM)(UINT)(f), 0)
#define DisplayDibWindowEndEx(hwnd)                     ::SendMessage(hwnd, DDM_END, 0, 0)
#define DisplayDibWindowClose(hwnd)                     ::SendMessage(hwnd, DDM_CLOSE, 0, 0)
#else
#define DisplayDibWindowBegin(hwnd)                     ShowWindow(hwnd, SW_SHOWNORMAL)
#define DisplayDibWindowEnd(hwnd)                       ShowWindow(hwnd, SW_HIDE)
#define DisplayDibWindowBeginEx(hwnd)                   SendMessage(hwnd, DDM_BEGIN, 0, 0)
#define DisplayDibWindowEndEx(hwnd)                     SendMessage(hwnd, DDM_END, 0, 0)
#define DisplayDibWindowClose(hwnd)                     SendMessage(hwnd, DDM_CLOSE, 0, 0)
#endif

#endif // _DISPDIB_H
