Manual: sfddiff

SFDDIFF(1)					   General Commands Manual					  SFDDIFF(1)

NAME
       sfddiff - compare two font files

SYNOPSIS
       sfddiff	[--help]  [--ignorehints] [--ignorenames] [--ignoregpos] [--ignoregsub] [--ignorebitmaps] [--exact] [--warn]
       [--merge outfile] [--usage] [--version] fontfile1 fontfile2

DESCRIPTION
       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 com‐
	   pared 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.

OPTIONS
       --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 out‐
		       lines  of sfdfile2 will be placed in the background.  Finally, for any characters with different out‐
		       lines or references the background of the character will contain the outlines from  sfdfile2  (refer‐
		       ences will be unlinked into outlines and those outlines also will be added).

       --usage	       Display the usage description.

       --version       Display the current version.

SEE ALSO
       fontforge(1)

       The HTML version of the FontForge manual, available online at: http://fontforge.sourceforge.net/.

NOTE
       FontForge used to be called PfaEdit.

AUTHORS
       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.

LICENSE
       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 li‐
       cense.

       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.

BUGS
       See the FontForge Github Issue Tracker, at https://github.com/fontforge/fontforge/issues/.

							 2017 Jun 18						  SFDDIFF(1)