Re: Get Bitmap From a Font

"Ian Semmel" <anyone@rocketcomp.com.au> wrote in message
news:eWA9svZfIHA.2000@TK2MSFTNGP03.phx.gbl...


I don't know tif this is "fancy" but the essential steps are as below.
The central API for this job is GetGlyphOutline().

A word or two of caution. I am doing this with symbol fonts with fewer
than 256 characters and nChar in the range [0,255]. I am not using Unicode
code points, which is why I use GetGlyphOutlineA() rather than
GetGlyphOutline(). For years I did this to get a collection of musical
symbols from a TrueType font and then blitted them onto the page with
BitBlt. Some Hewlett Packard printer drivers choked on having lots of mono
bitmaps blitted onto a page. HP would fix the drivers (eventually), but
then they'd bring out a new printer with the same bug in its drivers. So I
gave it up and started drawing the characters with TextOut() and a string of
one character. No more problems. The result is that I haven't used this
code in anger for a few years now, so there are no guarantees :-)

Dave
--
David Webber
Author of 'Mozart the Music Processor'
http://www.mozart.co.uk
For discussion/support see
http://www.mozart.co.uk/mozartists/mailinglist.htm

================================

1. Select the font into CDC *pDC,
2. Then to get the nChar'th character:

===========
   GLYPHMETRICS GlyphMetrics;
    MAT2 Mt2 = Mat2NoRotation();

    // Find the required buffer size for the data bits:

     DWORD dwBufferSize = ::GetGlyphOutlineA( pDC->m_hAttribDC,
            (UINT)nChar, GGO_BITMAP,
                                            &GlyphMetrics, 0, NULL, &Mt2 );

    LPSTR lpBitmapBuffer = (LPSTR)GlobalAllocPtr( GMEM_MOVEABLE,
dwBufferSize );

    // Get the data bits and the GLYPHMETRICS

    ::GetGlyphOutlineA( pDC->m_hAttribDC, (UINT)nChar, GGO_BITMAP,
&GlyphMetrics,
             dwBufferSize, lpBitmapBuffer, &Mt2 );

    // Make a bitmap:

    HBITMAP hBitmap = MakeMonochromeBitmap( pDC, GlyphMetrics.gmBlackBoxX,
                                              GlyphMetrics.gmBlackBoxY,
                                                       lpBitmapBuffer );

    // Have copied the bitmap data into the hBitmap block of memory
    // so now I can free the original:

    GlobalFreePtr( lpBitmapBuffer );

===========
Where MakeMonochromeBitmap is
===========
HBITMAP MakeMonochromeBitmap( CDC *pDC, UINT uWidth, UINT uHeight, LPSTR
lpBitmapData )
{
    // The first thing I need for an n-colour DIB is an area
    // of memory for a BITMAPINFO which consists of a
    // BITMAPINFOHEADER followed by n RGBQUAD structures
    // containing the colour information.

    HBITMAP hBitmap;
    int nColours = 2;
    RGBQUAD rgbqBlack = { 0, 0, 0, 0 };
    RGBQUAD rgbqWhite = { 255, 255, 255, 0 };

    // Define the number of bytes for the header information (including
    // colour information) and the total number of bytes:

    DWORD dwBytes = sizeof(BITMAPINFOHEADER) + (nColours*sizeof(RGBQUAD));

    // Allocate the appropriate space and note where
    // the copy of the data is to be put:

    LPBITMAPINFO lpbmi = (LPBITMAPINFO) GlobalAllocPtr( GHND, dwBytes );

    // Define the BITMAPINFOHEADER information:

    lpbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    lpbmi->bmiHeader.biWidth = uWidth;
    lpbmi->bmiHeader.biHeight = uHeight;
    lpbmi->bmiHeader.biPlanes = 1; // 1 plane.
    lpbmi->bmiHeader.biBitCount = 1; // 1 bit per pixel.
    lpbmi->bmiHeader.biCompression = BI_RGB; // No fancy compression.
    lpbmi->bmiHeader.biSizeImage = 0;
    lpbmi->bmiHeader.biXPelsPerMeter = 0;
    lpbmi->bmiHeader.biYPelsPerMeter = 0;
    lpbmi->bmiHeader.biClrUsed = nColours;
    lpbmi->bmiHeader.biClrImportant = 0; // Ignore.

    // Now fill in the RGB information starting after the BITMAPINFOHEADER:

    LPRGBQUAD lprgbq = (LPRGBQUAD)( (LPSTR)lpbmi+sizeof(BITMAPINFOHEADER) );

    lprgbq[1] = rgbqBlack;
    lprgbq[0] = rgbqWhite;

    // Now create the bitmap using the copy of the data:

    hBitmap = CreateDIBitmap( pDC->m_hDC, (LPBITMAPINFOHEADER)lpbmi,
                           CBM_INIT, lpBitmapData, lpbmi, DIB_RGB_COLORS );

    // The original data in lpBitmapData may now be discarded
    // by the calling function if it wants to, as the bitmap
    // has its own copy. This routine frees the bitmap info.

    GlobalFreePtr( lpbmi );

    return hBitmap;
}

====
Et voila!