/*
 * GDI device-independent bitmaps
 *
 * Copyright 1993,1994  Alexandre Julliard
 *
 */

#include "bitmap.h"
#include "callback.h"
#include "dc.h"
#include "debug.h"
#include "monitor.h"
#include "palette.h"

/***********************************************************************
 *           DIB_GetDIBWidthBytes
 *
 * Return the width of a DIB bitmap in bytes. DIB bitmap data is 32-bit aligned.
 * http://www.microsoft.com/msdn/sdk/platforms/doc/sdk/win32/struc/src/str01.htm
 */
int DIB_GetDIBWidthBytes( int width, int depth )
{
    int words;

    switch(depth)
    {
	case 1:  words = (width + 31) / 32; break;
	case 4:  words = (width + 7) / 8; break;
	case 8:  words = (width + 3) / 4; break;
	case 15:
	case 16: words = (width + 1) / 2; break;
	case 24: words = (width * 3 + 3)/4; break;

	default:
            WARN(bitmap, "(%d): Unsupported depth\n", depth );
	/* fall through */
	case 32:
	        words = width;
    }
    return 4 * words;
}


/***********************************************************************
 *           DIB_BitmapInfoSize
 *
 * Return the size of the bitmap info structure including color table.
 */
int DIB_BitmapInfoSize( BITMAPINFO * info, WORD coloruse )
{
    int colors;

    if (info->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
    {
        BITMAPCOREHEADER *core = (BITMAPCOREHEADER *)info;
        colors = (core->bcBitCount <= 8) ? 1 << core->bcBitCount : 0;
        return sizeof(BITMAPCOREHEADER) + colors *
             ((coloruse == DIB_RGB_COLORS) ? sizeof(RGBTRIPLE) : sizeof(WORD));
    }
    else  /* assume BITMAPINFOHEADER */
    {
        colors = info->bmiHeader.biClrUsed;
        if (!colors && (info->bmiHeader.biBitCount <= 8))
            colors = 1 << info->bmiHeader.biBitCount;
        return sizeof(BITMAPINFOHEADER) + colors *
               ((coloruse == DIB_RGB_COLORS) ? sizeof(RGBQUAD) : sizeof(WORD));
    }
}


/***********************************************************************
 *           DIB_GetBitmapInfo
 *
 * Get the info from a bitmap header.
 * Return 1 for INFOHEADER, 0 for COREHEADER, -1 for error.
 */
int DIB_GetBitmapInfo( const BITMAPINFOHEADER *header, DWORD *width,
                              int *height, WORD *bpp, WORD *compr )
{
    if (header->biSize == sizeof(BITMAPINFOHEADER))
    {
        *width  = header->biWidth;
        *height = header->biHeight;
        *bpp    = header->biBitCount;
        *compr  = header->biCompression;
        return 1;
    }
    if (header->biSize == sizeof(BITMAPCOREHEADER))
    {
        BITMAPCOREHEADER *core = (BITMAPCOREHEADER *)header;
        *width  = core->bcWidth;
        *height = core->bcHeight;
        *bpp    = core->bcBitCount;
        *compr  = 0;
        return 0;
    }
    WARN(bitmap, "(%ld): wrong size for header\n", header->biSize );
    return -1;
}


/***********************************************************************
 *           StretchDIBits16   (GDI.439)
 */
INT16 WINAPI StretchDIBits16(HDC16 hdc, INT16 xDst, INT16 yDst, INT16 widthDst,
                       INT16 heightDst, INT16 xSrc, INT16 ySrc, INT16 widthSrc,
                       INT16 heightSrc, const VOID *bits,
                       const BITMAPINFO *info, UINT16 wUsage, DWORD dwRop )
{
    return (INT16)StretchDIBits( hdc, xDst, yDst, widthDst, heightDst,
                                   xSrc, ySrc, widthSrc, heightSrc, bits,
                                   info, wUsage, dwRop );
}


/***********************************************************************
 *           StretchDIBits32   (GDI32.351)
 */
INT WINAPI StretchDIBits(HDC hdc, INT xDst, INT yDst, INT widthDst,
                       INT heightDst, INT xSrc, INT ySrc, INT widthSrc,
                       INT heightSrc, const void *bits,
                       const BITMAPINFO *info, UINT wUsage, DWORD dwRop )
{
    DC *dc = DC_GetDCPtr( hdc );
    if(!dc) return FALSE;

    if(dc->funcs->pStretchDIBits)
    	   return dc->funcs->pStretchDIBits(dc, xDst, yDst, widthDst, 
					    heightDst, xSrc, ySrc, widthSrc,
					    heightSrc, bits, info, wUsage,
					    dwRop);
    else { /* use StretchBlt32 */
        HBITMAP hBitmap, hOldBitmap;
	HDC hdcMem;
    
	hBitmap = CreateDIBitmap( hdc, &info->bmiHeader, CBM_INIT,
				    bits, info, wUsage );
	hdcMem = CreateCompatibleDC( hdc );
	hOldBitmap = SelectObject( hdcMem, hBitmap );
        /* Origin for DIBitmap is bottom left ! */
        StretchBlt( hdc, xDst, yDst, widthDst, heightDst,
                      hdcMem, xSrc, info->bmiHeader.biHeight - heightSrc - ySrc, 
                      widthSrc, heightSrc, dwRop );
	SelectObject( hdcMem, hOldBitmap );
	DeleteDC( hdcMem );
	DeleteObject( hBitmap );
	return heightSrc;
    }
}


/***********************************************************************
 *           SetDIBits16    (GDI.440)
 */
INT16 WINAPI SetDIBits16( HDC16 hdc, HBITMAP16 hbitmap, UINT16 startscan,
                          UINT16 lines, LPCVOID bits, const BITMAPINFO *info,
                          UINT16 coloruse )
{
    return SetDIBits( hdc, hbitmap, startscan, lines, bits, info, coloruse );
}


/******************************************************************************
 * SetDIBits32 [GDI32.312]  Sets pixels in a bitmap using colors from DIB
 *
 * PARAMS
 *    hdc       [I] Handle to device context
 *    hbitmap   [I] Handle to bitmap
 *    startscan [I] Starting scan line
 *    lines     [I] Number of scan lines
 *    bits      [I] Array of bitmap bits
 *    info      [I] Address of structure with data
 *    coloruse  [I] Type of color indexes to use
 *
 * RETURNS
 *    Success: Number of scan lines copied
 *    Failure: 0
 */
INT WINAPI SetDIBits( HDC hdc, HBITMAP hbitmap, UINT startscan,
		      UINT lines, LPCVOID bits, const BITMAPINFO *info,
		      UINT coloruse )
{
    DC *dc;
    BITMAPOBJ *bitmap;
    INT result;

    /* Check parameters */
    dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
    if (!dc) 
    {
	dc = (DC *) GDI_GetObjPtr(hdc, METAFILE_DC_MAGIC);
	if (!dc) return 0;
    }

    if (!(bitmap = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC )))
    {
        GDI_HEAP_UNLOCK( hdc );
        return 0;
    }

    result = BITMAP_Driver->pSetDIBits(bitmap, dc, startscan, 
				       lines, bits, info, 
				       coloruse, hbitmap);

    GDI_HEAP_UNLOCK( hdc );
    GDI_HEAP_UNLOCK( hbitmap );

    return result;
}


/***********************************************************************
 *           SetDIBitsToDevice16    (GDI.443)
 */
INT16 WINAPI SetDIBitsToDevice16(HDC16 hdc, INT16 xDest, INT16 yDest, INT16 cx,
                           INT16 cy, INT16 xSrc, INT16 ySrc, UINT16 startscan,
                           UINT16 lines, LPCVOID bits, const BITMAPINFO *info,
                           UINT16 coloruse )
{
    return SetDIBitsToDevice( hdc, xDest, yDest, cx, cy, xSrc, ySrc,
                                startscan, lines, bits, info, coloruse );
}


/***********************************************************************
 *           SetDIBitsToDevice32   (GDI32.313)
 */
INT WINAPI SetDIBitsToDevice(HDC hdc, INT xDest, INT yDest, DWORD cx,
                           DWORD cy, INT xSrc, INT ySrc, UINT startscan,
                           UINT lines, LPCVOID bits, const BITMAPINFO *info,
                           UINT coloruse )
{
    INT ret;
    DC *dc;

    if (!(dc = DC_GetDCPtr( hdc ))) return 0;

    if(dc->funcs->pSetDIBitsToDevice)
        ret = dc->funcs->pSetDIBitsToDevice( dc, xDest, yDest, cx, cy, xSrc,
					     ySrc, startscan, lines, bits,
					     info, coloruse );
    else {
        FIXME(bitmap, "unimplemented on hdc %08x\n", hdc);
	ret = 0;
    }

    GDI_HEAP_UNLOCK( hdc );
    return ret;
}

/***********************************************************************
 *           SetDIBColorTable16    (GDI.602)
 */
UINT16 WINAPI SetDIBColorTable16( HDC16 hdc, UINT16 startpos, UINT16 entries,
				  RGBQUAD *colors )
{
    return SetDIBColorTable( hdc, startpos, entries, colors );
}

/***********************************************************************
 *           SetDIBColorTable32    (GDI32.311)
 */
UINT WINAPI SetDIBColorTable( HDC hdc, UINT startpos, UINT entries,
				  RGBQUAD *colors )
{
    DC * dc;
    PALETTEENTRY * palEntry;
    PALETTEOBJ * palette;
    RGBQUAD *end;

    dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
    if (!dc) 
    {
	dc = (DC *)GDI_GetObjPtr(hdc, METAFILE_DC_MAGIC);
	if (!dc) return 0;
    }

    if (!(palette = (PALETTEOBJ*)GDI_GetObjPtr( dc->w.hPalette, PALETTE_MAGIC )))
    {
        return 0;
    }

    /* Transfer color info */
    
    if (dc->w.bitsPerPixel <= 8) {
	palEntry = palette->logpalette.palPalEntry + startpos;
	if (startpos + entries > (1 << dc->w.bitsPerPixel)) {
	    entries = (1 << dc->w.bitsPerPixel) - startpos;
	}
	for (end = colors + entries; colors < end; palEntry++, colors++)
	{
	    palEntry->peRed   = colors->rgbRed;
	    palEntry->peGreen = colors->rgbGreen;
	    palEntry->peBlue  = colors->rgbBlue;
	}
    } else {
	entries = 0;
    }
    GDI_HEAP_UNLOCK( dc->w.hPalette );
    return entries;
}

/***********************************************************************
 *           GetDIBColorTable16    (GDI.603)
 */
UINT16 WINAPI GetDIBColorTable16( HDC16 hdc, UINT16 startpos, UINT16 entries,
				  RGBQUAD *colors )
{
    return GetDIBColorTable( hdc, startpos, entries, colors );
}

/***********************************************************************
 *           GetDIBColorTable32    (GDI32.169)
 */
UINT WINAPI GetDIBColorTable( HDC hdc, UINT startpos, UINT entries,
				  RGBQUAD *colors )
{
    DC * dc;
    PALETTEENTRY * palEntry;
    PALETTEOBJ * palette;
    RGBQUAD *end;

    dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
    if (!dc) 
    {
	dc = (DC *)GDI_GetObjPtr(hdc, METAFILE_DC_MAGIC);
	if (!dc) return 0;
    }

    if (!(palette = (PALETTEOBJ*)GDI_GetObjPtr( dc->w.hPalette, PALETTE_MAGIC )))
    {
        return 0;
    }

    /* Transfer color info */
    
    if (dc->w.bitsPerPixel <= 8) {
	palEntry = palette->logpalette.palPalEntry + startpos;
	if (startpos + entries > (1 << dc->w.bitsPerPixel)) {
	    entries = (1 << dc->w.bitsPerPixel) - startpos;
	}
	for (end = colors + entries; colors < end; palEntry++, colors++)
	{
	    colors->rgbRed      = palEntry->peRed;
	    colors->rgbGreen    = palEntry->peGreen;
	    colors->rgbBlue     = palEntry->peBlue;
	    colors->rgbReserved = 0;
	}
    } else {
	entries = 0;
    }
    GDI_HEAP_UNLOCK( dc->w.hPalette );
    return entries;
}

/* FIXME the following two structs should be combined with __sysPalTemplate in
   objects/color.c - this should happen after de-X11-ing both of these
   files.
   NB. RGBQUAD and PALETTENTRY have different orderings of red, green
   and blue - sigh */

static RGBQUAD EGAColors[16] = { 
/* rgbBlue, rgbGreen, rgbRed, rgbReserverd */
    { 0x00, 0x00, 0x00, 0x00 },
    { 0x00, 0x00, 0x80, 0x00 },
    { 0x00, 0x80, 0x00, 0x00 },
    { 0x00, 0x80, 0x80, 0x00 },
    { 0x80, 0x00, 0x00, 0x00 },
    { 0x80, 0x00, 0x80, 0x00 },
    { 0x80, 0x80, 0x00, 0x00 },
    { 0x80, 0x80, 0x80, 0x00 },
    { 0xc0, 0xc0, 0xc0, 0x00 },
    { 0x00, 0x00, 0xff, 0x00 },
    { 0x00, 0xff, 0x00, 0x00 },
    { 0x00, 0xff, 0xff, 0x00 },
    { 0xff, 0x00, 0x00, 0x00 },
    { 0xff, 0x00, 0xff, 0x00 },
    { 0xff, 0xff, 0x00, 0x00 },
    { 0xff, 0xff, 0xff, 0x00 }
};


static RGBQUAD DefLogPalette[20] = { /* Copy of Default Logical Palette */
/* rgbBlue, rgbGreen, rgbRed, rgbReserverd */
    { 0x00, 0x00, 0x00, 0x00 },
    { 0x00, 0x00, 0x80, 0x00 },
    { 0x00, 0x80, 0x00, 0x00 },
    { 0x00, 0x80, 0x80, 0x00 },
    { 0x80, 0x00, 0x00, 0x00 },
    { 0x80, 0x00, 0x80, 0x00 },
    { 0x80, 0x80, 0x00, 0x00 },
    { 0xc0, 0xc0, 0xc0, 0x00 },
    { 0xc0, 0xdc, 0xc0, 0x00 },
    { 0xf0, 0xca, 0xa6, 0x00 },
    { 0xf0, 0xfb, 0xff, 0x00 },
    { 0xa4, 0xa0, 0xa0, 0x00 },
    { 0x80, 0x80, 0x80, 0x00 },
    { 0x00, 0x00, 0xf0, 0x00 },
    { 0x00, 0xff, 0x00, 0x00 },
    { 0x00, 0xff, 0xff, 0x00 },
    { 0xff, 0x00, 0x00, 0x00 },
    { 0xff, 0x00, 0xff, 0x00 },
    { 0xff, 0xff, 0x00, 0x00 },
    { 0xff, 0xff, 0xff, 0x00 }
};

/***********************************************************************
 *           GetDIBits16    (GDI.441)
 */
INT16 WINAPI GetDIBits16( HDC16 hdc, HBITMAP16 hbitmap, UINT16 startscan,
                          UINT16 lines, LPVOID bits, BITMAPINFO * info,
                          UINT16 coloruse )
{
    return GetDIBits( hdc, hbitmap, startscan, lines, bits, info, coloruse );
}


/******************************************************************************
 * GetDIBits32 [GDI32.170]  Retrieves bits of bitmap and copies to buffer
 *
 * RETURNS
 *    Success: Number of scan lines copied from bitmap
 *    Failure: 0
 *
 * http://www.microsoft.com/msdn/sdk/platforms/doc/sdk/win32/func/src/f30_14.htm
 */
INT WINAPI GetDIBits(
    HDC hdc,         /* [in]  Handle to device context */
    HBITMAP hbitmap, /* [in]  Handle to bitmap */
    UINT startscan,  /* [in]  First scan line to set in dest bitmap */
    UINT lines,      /* [in]  Number of scan lines to copy */
    LPVOID bits,       /* [out] Address of array for bitmap bits */
    BITMAPINFO * info, /* [out] Address of structure with bitmap data */
    UINT coloruse)   /* [in]  RGB or palette index */
{
    DC * dc;
    BITMAPOBJ * bmp;
    PALETTEENTRY * palEntry;
    PALETTEOBJ * palette;
    int i;

    if (!lines) return 0;
    if (!info) return 0;
    dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
    if (!dc) 
    {
	dc = (DC *)GDI_GetObjPtr(hdc, METAFILE_DC_MAGIC);
	if (!dc) return 0;
    }
    if (!(bmp = (BITMAPOBJ *)GDI_GetObjPtr( hbitmap, BITMAP_MAGIC )))
    {
        GDI_HEAP_UNLOCK( hdc );
	return 0;
    }
    if (!(palette = (PALETTEOBJ*)GDI_GetObjPtr( dc->w.hPalette, PALETTE_MAGIC )))
    {
        GDI_HEAP_UNLOCK( hdc );
        GDI_HEAP_UNLOCK( hbitmap );
        return 0;
    }

    /* Transfer color info */

    if (info->bmiHeader.biBitCount <= 8 && info->bmiHeader.biBitCount > 0 ) {

	info->bmiHeader.biClrUsed = 0;

	if(info->bmiHeader.biBitCount >= bmp->bitmap.bmBitsPixel) {
	    palEntry = palette->logpalette.palPalEntry;
	    for (i = 0; i < (1 << bmp->bitmap.bmBitsPixel); i++, palEntry++) {
		if (coloruse == DIB_RGB_COLORS) {
		    info->bmiColors[i].rgbRed      = palEntry->peRed;
		    info->bmiColors[i].rgbGreen    = palEntry->peGreen;
		    info->bmiColors[i].rgbBlue     = palEntry->peBlue;
		    info->bmiColors[i].rgbReserved = 0;
		}
		else ((WORD *)info->bmiColors)[i] = (WORD)i;
	    }
	} else {
	    switch (info->bmiHeader.biBitCount) {
	    case 1:
	        info->bmiColors[0].rgbRed = info->bmiColors[0].rgbGreen =
		  info->bmiColors[0].rgbBlue = 0;
		info->bmiColors[0].rgbReserved = 0;
		info->bmiColors[1].rgbRed = info->bmiColors[1].rgbGreen =
		  info->bmiColors[1].rgbBlue = 0xff;
		info->bmiColors[1].rgbReserved = 0;
		break;

	    case 4:
	        memcpy(info->bmiColors, EGAColors, sizeof(EGAColors));
		break;

	    case 8:
	        {
	        INT r, g, b;
		RGBQUAD *color;

		memcpy(info->bmiColors, DefLogPalette,
		       10 * sizeof(RGBQUAD));
		memcpy(info->bmiColors + 246, DefLogPalette + 10,
		       10 * sizeof(RGBQUAD));
		color = info->bmiColors + 10;
		for(r = 0; r <= 5; r++) /* FIXME */
		    for(g = 0; g <= 5; g++)
		        for(b = 0; b <= 5; b++) {
			    color->rgbRed =   (r * 0xff) / 5;
			    color->rgbGreen = (g * 0xff) / 5;
			    color->rgbBlue =  (b * 0xff) / 5;
			    color->rgbReserved = 0;
			    color++;
			}
		}
	    }
	}
    }

    GDI_HEAP_UNLOCK( dc->w.hPalette );

    if (bits)
    {
	if(!BITMAP_Driver->pGetDIBits(bmp, dc, startscan, lines, bits, info, coloruse, hbitmap))	
        {
	    GDI_HEAP_UNLOCK( hdc );
	    GDI_HEAP_UNLOCK( hbitmap );

	    return FALSE;
	}
    }
    else if( info->bmiHeader.biSize >= sizeof(BITMAPINFOHEADER) ) 
    {
	/* fill in struct members */

        if( info->bmiHeader.biBitCount == 0)
	{
	    info->bmiHeader.biWidth = bmp->bitmap.bmWidth;
	    info->bmiHeader.biHeight = bmp->bitmap.bmHeight;
	    info->bmiHeader.biPlanes = 1;
	    info->bmiHeader.biBitCount = bmp->bitmap.bmBitsPixel;
	    info->bmiHeader.biSizeImage = bmp->bitmap.bmHeight *
                             DIB_GetDIBWidthBytes( bmp->bitmap.bmWidth,
                                                   bmp->bitmap.bmBitsPixel );
	    info->bmiHeader.biCompression = 0;
	}
	else
	{
	    info->bmiHeader.biSizeImage = info->bmiHeader.biHeight *
	                    DIB_GetDIBWidthBytes( info->bmiHeader.biWidth,
						  info->bmiHeader.biBitCount );
	}
    }

    TRACE(bitmap, "biSizeImage = %ld, biWidth = %ld, biHeight = %ld\n",
	  info->bmiHeader.biSizeImage, info->bmiHeader.biWidth,
	  info->bmiHeader.biHeight);

    GDI_HEAP_UNLOCK( hdc );
    GDI_HEAP_UNLOCK( hbitmap );

    return lines;
}


/***********************************************************************
 *           CreateDIBitmap16    (GDI.442)
 */
HBITMAP16 WINAPI CreateDIBitmap16( HDC16 hdc, const BITMAPINFOHEADER * header,
                            DWORD init, LPCVOID bits, const BITMAPINFO * data,
                            UINT16 coloruse )
{
    return CreateDIBitmap( hdc, header, init, bits, data, coloruse );
}


/***********************************************************************
 *           CreateDIBitmap32    (GDI32.37)
 */
HBITMAP WINAPI CreateDIBitmap( HDC hdc, const BITMAPINFOHEADER *header,
                            DWORD init, LPCVOID bits, const BITMAPINFO *data,
                            UINT coloruse )
{
    HBITMAP handle;
    BOOL fColor;
    DWORD width;
    int height;
    WORD bpp;
    WORD compr;

    if (DIB_GetBitmapInfo( header, &width, &height, &bpp, &compr ) == -1) return 0;
    if (height < 0) height = -height;

    /* Check if we should create a monochrome or color bitmap. */
    /* We create a monochrome bitmap only if it has exactly 2  */
    /* colors, which are either black or white, nothing else.  */
    /* In all other cases, we create a color bitmap.           */

    if (bpp != 1) fColor = TRUE;
    else if ((coloruse != DIB_RGB_COLORS) ||
             (init != CBM_INIT) || !data) fColor = FALSE;
    else
    {
        if (data->bmiHeader.biSize == sizeof(BITMAPINFOHEADER))
        {
            RGBQUAD *rgb = data->bmiColors;
            DWORD col = RGB( rgb->rgbRed, rgb->rgbGreen, rgb->rgbBlue );
            if ((col == RGB(0,0,0)) || (col == RGB(0xff,0xff,0xff)))
            {
                rgb++;
                col = RGB( rgb->rgbRed, rgb->rgbGreen, rgb->rgbBlue );
                fColor = ((col != RGB(0,0,0)) && (col != RGB(0xff,0xff,0xff)));
            }
            else fColor = TRUE;
        }
        else if (data->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
        {
            RGBTRIPLE *rgb = ((BITMAPCOREINFO *)data)->bmciColors;
            DWORD col = RGB( rgb->rgbtRed, rgb->rgbtGreen, rgb->rgbtBlue );
            if ((col == RGB(0,0,0)) || (col == RGB(0xff,0xff,0xff)))
            {
                rgb++;
                col = RGB( rgb->rgbtRed, rgb->rgbtGreen, rgb->rgbtBlue );
                fColor = ((col != RGB(0,0,0)) && (col != RGB(0xff,0xff,0xff)));
            }
            else fColor = TRUE;
        }
        else
        {
            WARN(bitmap, "(%ld): wrong size for data\n",
                     data->bmiHeader.biSize );
            return 0;
        }
    }

    /* Now create the bitmap */

    handle = fColor ? CreateBitmap( width, height, 1, MONITOR_GetDepth(&MONITOR_PrimaryMonitor), NULL ) :
                      CreateBitmap( width, height, 1, 1, NULL );
    if (!handle) return 0;

    if (init == CBM_INIT)
        SetDIBits( hdc, handle, 0, height, bits, data, coloruse );
    return handle;
}

/***********************************************************************
 *           CreateDIBSection16    (GDI.489)
 */
HBITMAP16 WINAPI CreateDIBSection16 (HDC16 hdc, BITMAPINFO *bmi, UINT16 usage,
				     SEGPTR *bits, HANDLE section,
				     DWORD offset)
{
    HBITMAP16 hbitmap;
    DC *dc = (DC *) GDI_GetObjPtr(hdc, DC_MAGIC);
    if(!dc) dc = (DC *) GDI_GetObjPtr(hdc, METAFILE_DC_MAGIC);
    if(!dc) return (HBITMAP16) NULL;

    hbitmap = dc->funcs->pCreateDIBSection16(dc, bmi, usage, bits, section, offset);

    GDI_HEAP_UNLOCK(hdc);

    return hbitmap;
}

/***********************************************************************
 *           CreateDIBSection32    (GDI32.36)
 */
HBITMAP WINAPI CreateDIBSection(HDC hdc, BITMAPINFO *bmi, UINT usage,
				LPVOID *bits, HANDLE section,
				DWORD offset)
{
    HBITMAP hbitmap;
    DC *dc = (DC *) GDI_GetObjPtr(hdc, DC_MAGIC);
    if(!dc) dc = (DC *) GDI_GetObjPtr(hdc, METAFILE_DC_MAGIC);
    if(!dc) return (HBITMAP) NULL;

    hbitmap = dc->funcs->pCreateDIBSection(dc, bmi, usage, bits, section, offset);

    GDI_HEAP_UNLOCK(hdc);

    return hbitmap;
}

/***********************************************************************
 *           DIB_DeleteDIBSection
 */
void DIB_DeleteDIBSection( BITMAPOBJ *bmp )
{
    if (bmp && bmp->dib)
    {
        DIBSECTION *dib = bmp->dib;

        if (dib->dsBm.bmBits)
        {
            if (dib->dshSection)
                UnmapViewOfFile(dib->dsBm.bmBits);
            else
                VirtualFree(dib->dsBm.bmBits, MEM_RELEASE, 0L);
        }

	BITMAP_Driver->pDeleteDIBSection(bmp);

        HeapFree(GetProcessHeap(), 0, dib);
        bmp->dib = NULL;
    }
}

/***********************************************************************
 *           DIB_FixColorsToLoadflags
 *
 * Change color table entries when LR_LOADTRANSPARENT or LR_LOADMAP3DCOLORS
 * are in loadflags
 */
void DIB_FixColorsToLoadflags(BITMAPINFO * bmi, UINT loadflags, BYTE pix)
{
  int colors;
  COLORREF c_W, c_S, c_F, c_L, c_C;
  int incr,i;
  RGBQUAD *ptr;

  if (bmi->bmiHeader.biBitCount > 8) return;
  if (bmi->bmiHeader.biSize == sizeof(BITMAPINFOHEADER)) incr = 4;
  else if (bmi->bmiHeader.biSize == sizeof(BITMAPCOREHEADER)) incr = 3;
  else {
    WARN(bitmap, "Wrong bitmap header size!\n");
    return;
  }
  colors = bmi->bmiHeader.biClrUsed;
  if (!colors && (bmi->bmiHeader.biBitCount <= 8))
    colors = 1 << bmi->bmiHeader.biBitCount;
  c_W = GetSysColor(COLOR_WINDOW);
  c_S = GetSysColor(COLOR_3DSHADOW);
  c_F = GetSysColor(COLOR_3DFACE);
  c_L = GetSysColor(COLOR_3DLIGHT);
  if (loadflags & LR_LOADTRANSPARENT) {
    switch (bmi->bmiHeader.biBitCount) {
      case 1: pix = pix >> 7; break;
      case 4: pix = pix >> 4; break;
      case 8: break;
      default: 
        WARN(bitmap, "(%d): Unsupported depth\n", bmi->bmiHeader.biBitCount); 
	return;
    }
    if (pix >= colors) {
      WARN(bitmap, "pixel has color index greater than biClrUsed!\n");
      return;
    }
    if (loadflags & LR_LOADMAP3DCOLORS) c_W = c_F;
    ptr = (RGBQUAD*)((char*)bmi->bmiColors+pix*incr);
    ptr->rgbBlue = GetBValue(c_W);
    ptr->rgbGreen = GetGValue(c_W);
    ptr->rgbRed = GetRValue(c_W);
  }
  if (loadflags & LR_LOADMAP3DCOLORS)
    for (i=0; i<colors; i++) {
      ptr = (RGBQUAD*)((char*)bmi->bmiColors+i*incr);
      c_C = RGB(ptr->rgbRed, ptr->rgbGreen, ptr->rgbBlue);
      if (c_C == RGB(128, 128, 128)) { 
	ptr->rgbRed = GetRValue(c_S);
	ptr->rgbGreen = GetGValue(c_S);
	ptr->rgbBlue = GetBValue(c_S);
      } else if (c_C == RGB(192, 192, 192)) { 
	ptr->rgbRed = GetRValue(c_F);
	ptr->rgbGreen = GetGValue(c_F);
	ptr->rgbBlue = GetBValue(c_F);
      } else if (c_C == RGB(223, 223, 223)) { 
	ptr->rgbRed = GetRValue(c_L);
	ptr->rgbGreen = GetGValue(c_L);
	ptr->rgbBlue = GetBValue(c_L);
      } 
    }
}