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<p align="center"><font size="6" color="#0000ff">font-file format</font></p>
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<td width="100%">inf: font-file format [p_winsdk]<br>
<br>
3.00<br>
windows<br>
pssonly | windows 3 developer's notes summary enduser<br>
<br>
summary:<br>
<br>
note: this article is part of a set of seven articles, collectively<br>
called the "windows 3.00 developer's notes." more information about<br>
the contents of the other articles, and procedures for ordering a<br>
hard-copy set, can be found in the knowledge base article titled "inf:<br>
the windows 3.00 developer's notes" (q65260).<br>
<br>
this article can be found in the software/data library by searching on<br>
the keyword fontfmt or s12687.<br>
<br>
more information:<br>
<br>
formats for microsoft windows font files are defined for both raster<br>
and vector fonts. these formats can be used by smart text generators<br>
in some gdi support modules. the vector formats, in particular, are<br>
more frequently used by gdi itself than by support modules.<br>
<br>
<br>
both raster and vector font files begin with information that is<br>
common to both, and then continue with information that differs for<br>
each type of file.<br>
<br>
for windows 3.00, the font-file header includes six new fields:<br>
dflags, dfaspace, dfbspace, dfcspace, dfcolorpointer, and dfreserved1.<br>
these fields are not used in windows 3.00. to ensure compatibility<br>
with future versions of windows, these fields should be set to zero.<br>
<br>
all device drivers support the windows 2.x fonts. however, not all<br>
device drivers support the windows 3.00 version.<br>
<br>
windows 3.00 font files include the glyph table in dfchartable, which<br>
consists of structures that describe the bits for characters in the<br>
font file. this version enables fonts to exceed 64k in size, the size<br>
limit of windows 2.x fonts. this is made possible by the use of 32-bit<br>
offsets to the character glyphs in dfchartable.<br>
<br>
because of the 32-bit offsets and their potentially large size, these<br>
fonts are designed for use on systems that are running windows version<br>
3.00 in protected (standard or 386 enhanced) mode with an 80386 (or<br>
higher) processor where the processor's 32-bit registers can access<br>
the character glyphs. typically, device drivers use the windows 3.00<br>
version of a font only when both of these conditions are true.<br>
<br>
font files are stored with an .fnt extension of the form name.fnt. the<br>
information at the beginning of both raster and vector versions of<br>
windows 3.00 font files is shown in the following list:<br>
<br>
field description<br>
----- -----------<br>
<br>
dfversion 2 bytes specifying the version (0200h or 0300h) of<br>
the file.<br>
<br>
dfsize 4 bytes specifying the total size of the file in<br>
bytes.<br>
<br>
dfcopyright 60 bytes specifying copyright information.<br>
<br>
dftype 2 bytes specifying the type of font file.<br>
<br>
the low-order byte is exclusively for gdi use. if the<br>
low-order bit of the word is zero, it is a bitmap<br>
(raster) font file. if the low-order bit is 1, it is a<br>
vector font file. the second bit is reserved and must<br>
be zero. if no bits follow in the file and the bits are<br>
located in memory at a fixed address specified in<br>
dfbitsoffset, the third bit is set to 1; otherwise, the<br>
bit is set to 0 (zero). the high-order bit of the low<br>
byte is set if the font was realized by a device. the<br>
remaining bits in the low byte are reserved and set to<br>
zero.<br>
<br>
the high byte is reserved for device use and will<br>
always be set to zero for gdi-realized standard fonts.<br>
physical fonts with the high-order bit of the low byte<br>
set may use this byte to describe themselves. gdi will<br>
never inspect the high byte.<br>
<br>
dfpoints 2 bytes specifying the nominal point size at which<br>
this character set looks best.<br>
<br>
dfvertres 2 bytes specifying the nominal vertical resolution<br>
(dots-per-inch) at which this character set was<br>
digitized.<br>
<br>
dfhorizres 2 bytes specifying the nominal horizontal resolution<br>
(dots-per-inch) at which this character set was<br>
digitized.<br>
<br>
dfascent 2 bytes specifying the distance from the top of a<br>
character definition cell to the baseline of the<br>
typographical font. it is useful for aligning the<br>
baselines of fonts of different heights.<br>
<br>
dfinternalleading<br>
specifies the amount of leading inside the bounds set<br>
by dfpixheight. accent marks may occur in this area.<br>
this may be zero at the designer's option.<br>
<br>
dfexternalleading<br>
specifies the amount of extra leading that the designer<br>
requests the application add between rows. since this<br>
area is outside of the font proper, it contains no<br>
marks and will not be altered by text output calls in<br>
either the opaque or transparent mode. this may be zero<br>
at the designer's option.<br>
<br>
dfitalic 1 (one) byte specifying whether or not the character<br>
definition data represent an italic font. the low-order<br>
bit is 1 if the flag is set. all the other bits are<br>
zero.<br>
<br>
dfunderline 1 byte specifying whether or not the character<br>
definition data represent an underlined font. the<br>
low-order bit is 1 if the flag is set. all the other<br>
bits are 0 (zero).<br>
<br>
dfstrikeout 1 byte specifying whether or not the character<br>
definition data represent a struckout font. the low-<br>
order bit is 1 if the flag is set. all the other bits<br>
are zero.<br>
<br>
dfweight 2 bytes specifying the weight of the characters in the<br>
character definition data, on a scale of 1 to 1000. a<br>
dfweight of 400 specifies a regular weight.<br>
<br>
dfcharset 1 byte specifying the character set defined by this<br>
font.<br>
<br>
dfpixwidth 2 bytes. for vector fonts, specifies the width of the<br>
grid on which the font was digitized. for raster fonts,<br>
if dfpixwidth is nonzero, it represents the width for<br>
all the characters in the bitmap; if it is zero, the<br>
font has variable width characters whose widths are<br>
specified in the dfchartable array.<br>
<br>
dfpixheight 2 bytes specifying the height of the character bitmap<br>
(raster fonts), or the height of the grid on which a<br>
vector font was digitized.<br>
<br>
dfpitchandfamily<br>
specifies the pitch and font family. the low bit is set<br>
if the font is variable pitch. the high four bits give<br>
the family name of the font. font families describe in<br>
a general way the look of a font. they are intended for<br>
specifying fonts when the exact face name desired is<br>
not available. the families are as follows:<br>
<br>
family description<br>
------ -----------<br>
ff_dontcare (0<<4) don't care or don't know.<br>
ff_roman (1<<4) proportionally spaced fonts<br>
with serifs.<br>
ff_swiss (2<<4) proportionally spaced fonts<br>
without serifs.<br>
ff_modern (3<<4) fixed-pitch fonts.<br>
ff_script (4<<4)<br>
ff_decorative (5<<4)<br>
<br>
<br>
dfavgwidth 2 bytes specifying the width of characters in the font.<br>
for fixed-pitch fonts, this is the same as dfpixwidth.<br>
for variable-pitch fonts, this is the width of the<br>
character "x."<br>
<br>
dfmaxwidth 2 bytes specifying the maximum pixel width of any<br>
character in the font. for fixed-pitch fonts, this is<br>
simply dfpixwidth.<br>
<br>
dffirstchar 1 byte specifying the first character code defined by<br>
this font. character definitions are stored only for<br>
the characters actually present in a font. therefore,<br>
use this field when calculating indexes into either<br>
dfbits or dfcharoffset.<br>
<br>
dflastchar 1 byte specifying the last character code defined by<br>
this font. note that all the characters with codes<br>
between dffirstchar and dflastchar must be present in<br>
the font character definitions.<br>
<br>
dfdefaultchar 1 byte specifying the character to substitute<br>
whenever a string contains a character out of the<br>
range. the character is given relative to dffirstchar<br>
so that dfdefaultchar is the actual value of the<br>
character, less dffirstchar. the dfdefaultchar should<br>
indicate a special character that is not a space.<br>
<br>
dfbreakchar 1 byte specifying the character that will define word<br>
breaks. this character defines word breaks for word<br>
wrapping and word spacing justification. the character<br>
is given relative to dffirstchar so that dfbreakchar is<br>
the actual value of the character, less that of<br>
dffirstchar. the dfbreakchar is normally (32 -<br>
dffirstchar), which is an ascii space.<br>
<br>
dfwidthbytes 2 bytes specifying the number of bytes in each row of<br>
the bitmap. this is always even, so that the rows start<br>
on word boundaries. for vector fonts, this field has no<br>
meaning.<br>
<br>
dfdevice 4 bytes specifying the offset in the file to the string<br>
giving the device name. for a generic font, this value<br>
is zero.<br>
<br>
dfface 4 bytes specifying the offset in the file to the<br>
null-terminated string that names the face.<br>
<br>
dfbitspointer 4 bytes specifying the absolute machine address of<br>
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