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[subset] If DSIG is to be retained, drop all signatures

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Now DSIG can be retained by passing --drop-tables-=DSIG.
The embedded signatures will be dropped but empty table
retained.

Fixes https://github.com/behdad/fonttools/issues/145
This commit is contained in:
Behdad Esfahbod 2014-12-09 19:00:17 -08:00
parent 3560ee4c43
commit 4447a76c33
1 changed files with 12 additions and 4 deletions
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16
Lib/fontTools/subset.py
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@ -195,9 +195,9 @@ Font table options:
By default, the following tables are included in this list, as By default, the following tables are included in this list, as
they do not need subsetting (ignore the fact that 'loca' is listed they do not need subsetting (ignore the fact that 'loca' is listed
here): 'gasp', 'head', 'hhea', 'maxp', 'vhea', 'OS/2', 'loca', here): 'gasp', 'head', 'hhea', 'maxp', 'vhea', 'OS/2', 'loca',
'name', 'cvt ', 'fpgm', 'prep', and 'VMDX'. Tables that the tool does 'name', 'cvt ', 'fpgm', 'prep', 'VMDX', and 'DSIG'. Tables that the tool
not know how to subset and are not specified here will be dropped from does not know how to subset and are not specified here will be dropped
the font. from the font.
Example: Example:
--no-subset-tables+=FFTM --no-subset-tables+=FFTM
* Keep 'FFTM' table in the font by preventing subsetting. * Keep 'FFTM' table in the font by preventing subsetting.
@ -2056,6 +2056,13 @@ def subset_glyphs(self, s):
# to format=4 if there's not one. # to format=4 if there's not one.
return True # Required table return True # Required table
@_add_method(ttLib.getTableClass('DSIG'))
def prune_pre_subset(self, options):
# Drop all signatures since they will be invalid
self.usNumSigs = 0
self.signatureRecords = []
return True
@_add_method(ttLib.getTableClass('maxp')) @_add_method(ttLib.getTableClass('maxp'))
def prune_pre_subset(self, options): def prune_pre_subset(self, options):
if not options.hinting: if not options.hinting:
@ -2117,7 +2124,8 @@ class Options(object):
_drop_tables_default += ['Feat', 'Glat', 'Gloc', 'Silf', 'Sill'] # Graphite _drop_tables_default += ['Feat', 'Glat', 'Gloc', 'Silf', 'Sill'] # Graphite
_drop_tables_default += ['CBLC', 'CBDT', 'sbix', 'COLR', 'CPAL'] # Color _drop_tables_default += ['CBLC', 'CBDT', 'sbix', 'COLR', 'CPAL'] # Color
_no_subset_tables_default = ['gasp', 'head', 'hhea', 'maxp', 'vhea', 'OS/2', _no_subset_tables_default = ['gasp', 'head', 'hhea', 'maxp', 'vhea', 'OS/2',
'loca', 'name', 'cvt ', 'fpgm', 'prep', 'VDMX'] 'loca', 'name', 'cvt ', 'fpgm', 'prep', 'VDMX',
'DSIG']
_hinting_tables_default = ['cvt ', 'fpgm', 'prep', 'hdmx', 'VDMX'] _hinting_tables_default = ['cvt ', 'fpgm', 'prep', 'hdmx', 'VDMX']
# Based on HarfBuzz shapers # Based on HarfBuzz shapers