dibutils.cpp

一套图像处理程序,支持三种图像文件格式,我调试过了,很好用

    }

    nNumColors = DibNumColors(&bi);

#if 0
    if (bi.biSizeImage == 0)
        bi.biSizeImage = DibSizeImage(&bi);

    if (bi.biClrUsed == 0)
        bi.biClrUsed = DibNumColors(&bi);
#else
    FixBitmapInfo(&bi);
#endif

    pdib = (PDIB)GlobalAllocPtr(GMEM_MOVEABLE,(LONG)bi.biSize + nNumColors * sizeof(RGBQUAD));

    if (!pdib)
        return NULL;

    *pdib = bi;

    pRgb = DibColors(pdib);

    if (nNumColors)
    {
        if (size == sizeof(BITMAPCOREHEADER))
        {
            /*
             * convert a old color table (3 byte entries) to a new
             * color table (4 byte entries)
             */
            _lread(fh,(LPVOID)pRgb,nNumColors * sizeof(RGBTRIPLE));

            for (i=nNumColors-1; i>=0; i--)
            {
                RGBQUAD rgb;

                rgb.rgbRed      = ((RGBTRIPLE FAR *)pRgb)[i].rgbtRed;
                rgb.rgbBlue     = ((RGBTRIPLE FAR *)pRgb)[i].rgbtBlue;
                rgb.rgbGreen    = ((RGBTRIPLE FAR *)pRgb)[i].rgbtGreen;
                rgb.rgbReserved = (BYTE)0;

                pRgb[i] = rgb;
            }
        }
        else
        {
            _lread(fh,(LPVOID)pRgb,nNumColors * sizeof(RGBQUAD));
        }
    }

    if (bf.bfOffBits != 0L)
        _llseek(fh,off + bf.bfOffBits,SEEK_SET);

    return pdib;
}

/*
 *  DibSetUsage(hdib,hpal,wUsage)
 *
 *  Modifies the color table of the passed DIB for use with the wUsage
 *  parameter specifed.
 *
 *  if wUsage is DIB_PAL_COLORS the DIB color table is set to 0-256
 *  if wUsage is DIB_RGB_COLORS the DIB color table is set to the RGB values
 *      in the passed palette
 */

BOOL DibSetUsage(PDIB pdib, HPALETTE hpal,UINT wUsage)
{
    PALETTEENTRY       ape[256];
    RGBQUAD FAR *      pRgb;
    WORD FAR *         pw;
    int                nColors;
    int                n;

    if (hpal == NULL)
        hpal = (HPALETTE)GetStockObject(DEFAULT_PALETTE);

    if (!pdib)
        return FALSE;

    nColors = DibNumColors(pdib);
    
    if (nColors == 3 && DibCompression(pdib) == BI_BITFIELDS)
        nColors = 0;

    if (nColors > 0)
    {
        pRgb = DibColors(pdib);

        switch (wUsage)
        {
            //
            // Set the DIB color table to palette indexes
            //
            case DIB_PAL_COLORS:
                for (pw = (WORD FAR*)pRgb,n=0; n<nColors; n++,pw++)
                    *pw = n;
                break;

            //
            // Set the DIB color table to RGBQUADS
            //
            default:
            case DIB_RGB_COLORS:
                nColors =  (nColors < 256) ? nColors: 256;

                GetPaletteEntries(hpal,0,nColors,ape);

                for (n=0; n<nColors; n++)
                {
                    pRgb[n].rgbRed      = ape[n].peRed;
                    pRgb[n].rgbGreen    = ape[n].peGreen;
                    pRgb[n].rgbBlue     = ape[n].peBlue;
                    pRgb[n].rgbReserved = 0;
                }
                break;
        }
    }
    return TRUE;
}

/*
 *  DibCreate(bits, dx, dy)
 *
 *  Creates a new packed DIB with the given dimensions and the
 *  given number of bits per pixel
 */

PDIB DibCreate(int bits, int dx, int dy)
{
    LPBITMAPINFOHEADER lpbi ;
    DWORD       dwSizeImage;
    int         i;
    DWORD FAR  *pdw;

    dwSizeImage = dy*(DWORD)((dx*bits/8+3)&~3);

    lpbi = (PDIB)GlobalAllocPtr(GHND,sizeof(BITMAPINFOHEADER)+dwSizeImage + 1024);

    if (lpbi == NULL)
        return NULL;

    lpbi->biSize            = sizeof(BITMAPINFOHEADER) ;
    lpbi->biWidth           = dx;
    lpbi->biHeight          = dy;
    lpbi->biPlanes          = 1;
    lpbi->biBitCount        = bits ;
    lpbi->biCompression     = BI_RGB ;
    lpbi->biSizeImage       = dwSizeImage;
    lpbi->biXPelsPerMeter   = 0 ;
    lpbi->biYPelsPerMeter   = 0 ;
    lpbi->biClrUsed         = 0 ;
    lpbi->biClrImportant    = 0 ;

    if (bits == 4)
        lpbi->biClrUsed = 16;

    else if (bits == 8)
        lpbi->biClrUsed = 256;

    pdw = (DWORD FAR *)((LPBYTE)lpbi+(int)lpbi->biSize);

    for (i=0; i<(int)lpbi->biClrUsed/16; i++)
    {
        *pdw++ = 0x00000000;    // 0000  black
        *pdw++ = 0x00800000;    // 0001  dark red
        *pdw++ = 0x00008000;    // 0010  dark green
		  *pdw++ = 0x00808000;    // 0011  mustard
        *pdw++ = 0x00000080;    // 0100  dark blue
        *pdw++ = 0x00800080;    // 0101  purple
        *pdw++ = 0x00008080;    // 0110  dark turquoise
        *pdw++ = 0x00C0C0C0;    // 1000  gray
        *pdw++ = 0x00808080;    // 0111  dark gray
        *pdw++ = 0x00FF0000;    // 1001  red
        *pdw++ = 0x0000FF00;    // 1010  green
		  *pdw++ = 0x00FFFF00;    // 1011  yellow
        *pdw++ = 0x000000FF;    // 1100  blue
        *pdw++ = 0x00FF00FF;    // 1101  pink (magenta)
        *pdw++ = 0x0000FFFF;    // 1110  cyan
        *pdw++ = 0x00FFFFFF;    // 1111  white
    }

    return (PDIB)lpbi;
}

static void xlatClut8(BYTE FAR *pb, DWORD dwSize, BYTE FAR *xlat)
{
    DWORD dw;

#ifdef __cplusplus
    for (dw = 0; dw < dwSize; dw++, ((BYTE _huge *&)pb)++)
#else
    for (dw = 0; dw < dwSize; dw++, ((BYTE _huge *)pb)++)
#endif
        *pb = xlat[*pb];
}

static void xlatClut4(BYTE FAR *pb, DWORD dwSize, BYTE FAR *xlat)
{
    DWORD dw;

#ifdef __cplusplus
    for (dw = 0; dw < dwSize; dw++, ((BYTE _huge *&)pb)++)
#else
    for (dw = 0; dw < dwSize; dw++, ((BYTE _huge *)pb)++)
#endif
        *pb = (BYTE)(xlat[*pb & 0x0F] | (xlat[(*pb >> 4) & 0x0F] << 4));
}

#define RLE_ESCAPE  0
#define RLE_EOL     0
#define RLE_EOF     1
#define RLE_JMP     2

static void xlatRle8(BYTE FAR *pb, DWORD dwSize, BYTE FAR *xlat)
{
    BYTE    cnt;
    BYTE    b;
    BYTE _huge *prle = pb;

    for(;;)
    {
        cnt = *prle++;
        b   = *prle;

        if (cnt == RLE_ESCAPE)
        {
            prle++;

            switch (b)
            {
                case RLE_EOF:
                    return;

                case RLE_EOL:
                    break;

                case RLE_JMP:
                    prle++;     // skip dX
                    prle++;     // skip dY
                    break;

                default:
                    cnt = b;
                    for (b=0; b<cnt; b++,prle++)
                        *prle = xlat[*prle];

                    if (cnt & 1)
                        prle++;

                    break;
            }
        }
        else
        {
            *prle++ = xlat[b];
        }
    }
}

static void xlatRle4(BYTE FAR *pb, DWORD dwSize, BYTE FAR *xlat)
{
}

static void hmemmove(BYTE _huge *d, BYTE _huge *s, LONG len)
{
    d += len-1;
    s += len-1;

    while (len--)
        *d-- = *s--;
}

/*
 *  DibMapToPalette(pdib, hpal)
 *
 *  Map the colors of the DIB, using GetNearestPaletteIndex, to
 *  the colors of the given palette.
 */

BOOL DibMapToPalette(PDIB pdib, HPALETTE hpal)
{
	 LPBITMAPINFOHEADER  lpbi;
	 PALETTEENTRY        pe;
	 int                 n;
	 int                 nDibColors;
	 int                 nPalColors=0;
	 BYTE FAR *          lpBits;
	 RGBQUAD FAR *       lpRgb;
	 BYTE                xlat[256];
	 DWORD               SizeImage;

	 if (!hpal || !pdib)
		  return FALSE;

	 lpbi   = (LPBITMAPINFOHEADER)pdib;
	 lpRgb  = DibColors(pdib);

	 GetObject(hpal,sizeof(int),(LPSTR)&nPalColors);
	 nDibColors = DibNumColors(pdib);

	 if ((SizeImage = lpbi->biSizeImage) == 0)
		  SizeImage = DibSizeImage(lpbi);

	 //
	 //  build a xlat table. from the current DIB colors to the given
	 //  palette.
	 //
	 for (n=0; n<nDibColors; n++)
		  xlat[n] = (BYTE)GetNearestPaletteIndex(hpal,RGB(lpRgb[n].rgbRed,lpRgb[n].rgbGreen,lpRgb[n].rgbBlue));

	 lpBits = (LPBYTE)DibPtr(lpbi);
	 lpbi->biClrUsed = nPalColors;

	 //
	 // re-size the DIB
	 //
	 if (nPalColors > nDibColors)
	 {
		  GlobalReAllocPtr(lpbi, lpbi->biSize + nPalColors*sizeof(RGBQUAD) + SizeImage, 0);
		  hmemmove((BYTE _huge *)DibPtr(lpbi), (BYTE _huge *)lpBits, SizeImage);
		  lpBits = (LPBYTE)DibPtr(lpbi);
	 }
	 else if (nPalColors < nDibColors)
	 {
		  hmemcpy(DibPtr(lpbi), lpBits, SizeImage);
		  GlobalReAllocPtr(lpbi, lpbi->biSize + nPalColors*sizeof(RGBQUAD) + SizeImage, 0);
		  lpBits = (LPBYTE)DibPtr(lpbi);
	 }

	 //
	 // translate the DIB bits
	 //
	 switch (lpbi->biCompression)
	 {
		  case BI_RLE8:
				xlatRle8(lpBits, SizeImage, xlat);
				break;

		  case BI_RLE4:
				xlatRle4(lpBits, SizeImage, xlat);
				break;

        case BI_RGB:
				if (lpbi->biBitCount == 8)
                xlatClut8(lpBits, SizeImage, xlat);
            else
                xlatClut4(lpBits, SizeImage, xlat);
            break;
    }

    //
    //  Now copy the RGBs in the logical palette to the dib color table
    //
    for (n=0; n<nPalColors; n++)
    {
        GetPaletteEntries(hpal,n,1,&pe);

        lpRgb[n].rgbRed      = pe.peRed;
		  lpRgb[n].rgbGreen    = pe.peGreen;
		  lpRgb[n].rgbBlue     = pe.peBlue;
		  lpRgb[n].rgbReserved = (BYTE)0;
	 }

	 return TRUE;
}


HPALETTE MakePalette(const BITMAPINFO FAR* Info, UINT flags)
{
  HPALETTE hPalette;
  const RGBQUAD far* rgb = Info->bmiColors;

  WORD nColors = Info->bmiHeader.biClrUsed;
  if (nColors) {
	 LOGPALETTE* logPal = (LOGPALETTE*)
		 new BYTE[sizeof(LOGPALETTE) + (nColors-1)*sizeof(PALETTEENTRY)];

	 logPal->palVersion  = 0x300; // Windows 3.0 version
	 logPal->palNumEntries = nColors;
	 for (short n = 0; n < nColors; n++) {
		logPal->palPalEntry[n].peRed   = rgb[n].rgbRed;
		logPal->palPalEntry[n].peGreen = rgb[n].rgbGreen;
		logPal->palPalEntry[n].peBlue  = rgb[n].rgbBlue;
		logPal->palPalEntry[n].peFlags = (BYTE)flags;
	 }
	 hPalette = ::CreatePalette(logPal);
	 delete logPal;
  } else
	 hPalette = 0;

  return hPalette;
}