// GBitmap - Low level WinG primitives.
// Copyright (c) 1995 Tony Miceli

#ifndef _GBITMAP_H_
#define _GBITMAP_H_

#include <mmsystem.h>

// Helper macro for longword alignments
#define LONG_ALIGN(l) __asm     {           \
			  add l, 3          \
			  and l, 0xfffffffc \
}

// Type definition for frame callback function
typedef void (CALLBACK FRAMECALLBACK)(DWORD dwUser);
typedef FRAMECALLBACK *LPFRAMECALLBACK;

// Define the different BitBlt raster operations.  These are #defines to keep the asm 
// routines at top speed
#define BLT_SRCCOPY     0
#define BLT_TRANSCOPY   1
#define BLT_BLACKNESS   2
#define BLT_WHITENESS   3

// Screen clearing types
#define CLS_BLACKNESS   0
#define CLS_DISSOLVE    1

// Default frame rate
#define DEFAULT_FRAME_RATE      10

class CWinGBitmap
{
    HBITMAP   m_ghBitmapMonochrome;
    HDC       m_hWinGDC;

    LONG      m_nDIBWidth, m_nDIBHeight;
    
    LONG      m_Orientation;
    void far *m_hpSurfaceBits;
    LONG     *m_rowLookup,
	      m_rowBytes,
	      m_rowAdd;
    LPFRAMECALLBACK m_pfnFrameCallback, m_pfnOldFrameCallback;
    BOOL      m_bRefresh, m_bOldRefresh;
    CWnd     *m_pParent;
    UINT      m_wTimerID, m_wTimerPeriod;
    DWORD     m_dwUser;
    LONG      m_lClearStyle;
    LONG      m_lPixelsPerFrame;
    LONG      m_lClearFrames;

    RECT      m_rctUpdateRect;

    void CreateWinGDC(WORD nWidth, WORD nHeight);
    void DestroyWinGDC();

    BOOL InstallFrameHandler(UINT wFrameRate);
    void RemoveFrameHandler();
    static TIMECALLBACK UpdateDisplay;
    static FRAMECALLBACK ClrScr;

public:
    CWinGBitmap(CWnd *pParent, WORD nWidth=0, WORD nHeight=0);
    ~CWinGBitmap();

    HDC  GetDC() 
    { 
	return m_hWinGDC; 
    }

    LONG GetWidth()
    {
	return m_nDIBWidth;
    }

    LONG GetHeight()
    {
	return m_nDIBHeight;
    }

    HDC  Create(WORD nWidth, WORD nHeight);
	
    void Destroy();

    BYTE CWinGBitmap::GetPixel(LONG Xpos, LONG Ypos);

    void SetPixel(LONG Xpos, LONG Ypos, BYTE PixCol);

    void BitBlt(LONG nXDest, LONG nYDest, 
		LPVOID pSrc, ULONG nSrcWidth, ULONG nSrcHeight,
		LONG dwRop);

    void FillRect(LONG nXpos, LONG nYpos, LONG nWidth, LONG nHeight, BYTE PixCol);

    void DrawLine(LONG X1, LONG Y1, LONG X2, LONG Y2, BYTE LineCol);

    void SetFrameCallback(LPFRAMECALLBACK pfnFrameCallback, DWORD dwUser);
    void ResetFrameCallback();

    void EnableRefresh();

    void DisableRefresh();

    void AddUpdateRect(LONG x1, LONG y1, LONG x2, LONG y2);

    void ClearScreen(LONG lClearStyle = CLS_BLACKNESS, LONG lClearTime = 1L);
};

#endif // _GBITMAP_H_