KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q66925: _getfontinfo and Vector Mapped Fonts

Article: Q66925
Product(s): See article
Version(s): 6.00   | 6.00
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | docerr s_quickc | mspl13_c
Last Modified: 18-NOV-1990

_getfontinfo() is documented as returning a _fontinfo structure
containing information including type, facename, filename, ascent,
pixheight, pixwidth, and avgwidth about the font currently set.
However, _getfontinfo() only reads these values from the .FON file in
which they are stored. This can cause problems when using vector fonts
that have been scaled by the _setfont() function because the values
for ascent, pixheight, and avgwidth will probably be incorrect.

Vector fonts are stored in the .FON file as a series of equations that
can be multiplied by some scaling factor to generate fonts of
different sizes. By default, the scale factor is 1. When
_getfontinfo() is called, it will always return the values for ascent,
pixheight, and avgwitch assuming the default scale factor. If the font
is scaled to some type size other than the default (using _setfont()
with WxHy parameters), the new values for ascent, pixheight, and
avgwidth will need to be recalculated. The factor can be determined by
dividing the pixheight value returned from _getfontinfo() by the Hy
parameter passed to _setfont().

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.