sfddiff - compare two font files
sfddiff [
--help] [
--ignorehints] [
--ignorenames]
[
--ignoregpos] [
--ignoregsub] [
--ignorebitmaps] [
--exact] [
--warn] [
--merge outfile] [
--usage] [
--version]
fontfile1 fontfile2
The program
sfddiff compares two font files, which may be in any format
that
fontforge(1) can read. It will notice the following differences:
- 1)
- Characters are present in one font but not in the
other.
- 2)
- Characters are present in both fonts but have different
sets of outlines or references. The outlines may be compared so that only
exact matches are accepted, or so that a fuzzier match is used. Similarly
references may need to match exactly, or may be matched after an unlink.
This fuzzy comparison is useful when comparing truetype and postscript
fonts, or when comparing a font with references to one without.
- 3)
- The PostScript hints or TrueType instructions are
different.
- 4)
- The font names (the TrueType 'name' tables) differ.
- 5)
- The kerning (and other 'gpos' information) differs.
- 6)
- The ligatures (and other 'gsub' information) differ.
- 7)
- Any bitmap strikes present in one font but not in the
other.
- 8)
- Any bitmap characters present in one strike of one font but
not in the equivalent strike of the other.
- 9)
- Any bitmap characters which differ.
- --help
- Provide a description with a list of the available
options.
- --ignorehints
- Suppress the reporting of hint/instruction
differences.
- --ignoregpos
- Suppress the reporting of kerning (and other 'gpos')
differences.
- --ignoregsub
- Suppress the reporting of ligature (and other 'gsub')
differences.
- --ignorenames
- Suppress the reporting of name string differences.
- --ignorebitmaps
- Suppress the reporting of bitmap differences.
- --exact
- Require outlines to match exactly.
- --warn
- Warn if the outlines/references are slightly
different.
-
--merge outfile
- Store a merged version of the two fonts into the specified
output file. The merged data will be based on sfdfile1, any
characters present in sfdfile2 but not in sfdfile1 will be
added, and the outlines of sfdfile2 will be placed in the
background. Finally, for any characters with different outlines or
references the background of the character will contain the outlines from
sfdfile2 (references will be unlinked into outlines and those
outlines also will be added).
- --usage
- Display the usage description.
- --version
- Display the current version.
fontforge(1)
The HTML version of the
FontForge manual, available online at:
http://fontforge.sourceforge.net/.
FontForge used to be called
PfaEdit.
FontForge is Copyright © 2000–2014 by George Williams, and
is currently maintained by the FontForge development team. See
/usr/share/doc/fontforge/AUTHORS for a comprehensive list of contributors.
The
sfddiff program is licensed under GPLv3+: GNU GPL version 3 or
later (
http://gnu.org/licenses/gpl.html) with many parts covered by a BSD
license (
http://fontforge.org/license.html). Please read the LICENSE file
included in the FontForge distribution for details, or see
https://github.com/fontforge/fontforge/blob/master/LICENSE.
FontForge is available as a whole under the terms of the GNU GPL
(
http://www.gnu.org/copyleft/gpl.html), version 3 or any later version.
However, almost all of its parts are available under the "revised BSD
license" (
http://www.law.yi.org/~sfllaw/talks/bsd.pdf) because FontForge
was mostly written by George Williams, using that license.
The Revised BSD License is very permissive, and allows for code to be combined
with other code under other licenses.
There are many useful libraries available under copyleft libre licenses, such as
the LGPL and GPL, which FontForge started to use in 2012.
For example, Pango and Cairo are available under the LGPL.
Some features added since 2012 are licensed by their individual developers under
the GPLv3.
See the FontForge Github Issue Tracker, at
https://github.com/fontforge/fontforge/issues/.