1FTVALID(1)                  General Commands Manual                 FTVALID(1)
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NAME

6       ftvalid - font layout table validator
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SYNOPSIS

9       ftvalid [options] fontfile
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DESCRIPTION

12       ftvalid is an OpenType layout table validator.
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14       This program is part of the FreeType demos package.
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OPTIONS

17       -f index
18              Select font index (default: 0).
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20       -t validator
21              Select validator.  Available validators are ot, gx, and ckern.
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23              Note that the availability of validators depends on compile-time
24              options of FreeType (this is, whether the modules `otvalid'  and
25              `gxvalid' are compiled into the library).
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27       -T tbls
28              [ot,  gx]  Select sfnt table name tags to be validated.  Use `:'
29              to separate tags.
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31              Supported tables in ot validator are  BASE,  GDEF,  GPOS,  GSUB,
32              JSTF, and MATH.
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34              Supported  tables  in  gx  validator are feat, mort, morx, bsln,
35              just, kern, opbd, trak, prop, and lcar.
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37              Example: -T "feat:morx"
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39       -T dialect
40              [ckern] Select classic kern dialect for validation.  Use `:'  to
41              separate  dialect names.  If more than one dialect is specified,
42              all dialects are accepted when validating.
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44              Supported dialects in ckern validator are ms and apple.
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46       -l     List the layout-related SFNT tables available in the font  file.
47              The selected validator (with option -t) affects the list.
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49              ckern  is  applicable to `kern' table only.  Option -L lists di‐
50              alects supported in ckern validator  only  if  `kern'  table  is
51              available in the font file.
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53       -V level
54              Validation  level.   Possible values are 0 (default), 1 (tight),
55              and 2 (paranoid).
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57       -v     Show version.
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ENVIRONMENT VARIABLES

60       FT2_DEBUG
61              You can specify `component:level' pairs for tracing.  level must
62              be in the range [1,7].
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64              Available  components for ot validator are otvmodule, otvcommon,
65              otvbase, otvgdef, otvgpos, otvgsub, and otvjstf.
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67              Available components for gx validator are gxvmodule,  gxvcommon,
68              gxvfeat,  gxvmort,  gxvmorx, gxvbsln, gxvjust, gxvkern, gxvopbd,
69              gxvtrak, gxvprop, and gxvlcar.
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71              Available component for ckern validator is gxvkern only.
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73              Example: FT2_DEBUG="otvcommon:5 gxvkern:7"
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75              FT2_DEBUG  only  works  if  tracing  support  is  compiled  into
76              FreeType.
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80FreeType 2.13.1                    June 2023                        FTVALID(1)
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