HOWTO: Realize a TrueType Font as a Glyph Index Font

ID: Q180584

The information in this article applies to:

Microsoft Windows 95 Device Driver Kit (DDK)

SUMMARY

To indicate support for glyph indices for a TrueType font the printer driver has to call EngineRealizeFontExt function to realize the font.

MORE INFORMATION

To support glyph indices, the printer driver has to perform the following steps:

1. Build the driver with a resource compiler that supports the -40 option.

2. Set the dpVersion field of the GDIINFO 0x400. This will tell GDI that

   the driver is a Windows 95 driver.

3. Set the C1_GLYPH_INDEX ( 0x100 ) flag in the dpCaps1, which is in the

   GDIINFO structure, to indicate that the driver supports glyph index
   fonts.

4. At RealizeObject time, the driver must realize the font using the

   EngineRealizeFontExt (...) function. This sets the appropriate
   fields in the FONTINFO structure. The prototype for the
   EngineRealizeFontExt is:

       WORD FAR PASCAL EngineRealizeFontExt ( HDC,
                                              LPLOGFONT,
                                              LPTEXTXFORM,
                                              LPFONTINFO,
                                              WORD   /* flags */  );

   Bit 0 of the flags parameter indicates whether to realize the font as a
   glyph index font or old style font (all other bits should be zero).

5. Return a value of 0x400 in DeviceCapabilities for DC_VERSION.

To confirm support for the glyph indices, you can check the FONTINFO structure that is passed to the ExtTextOut function. It should have the PF_GLYPH_INDEX ( 0x20) bit set in the dfType field, and the lpString will have the glyph indices for the string to printed.

Additional query words:

Keywords          : ntddkprnt 
Version           : WINDOWS:4.0
Platform          : WINDOWS
Hardware          : x86
Issue type        : kbhowto

Last Reviewed: June 25, 1998