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implement building GSUB FeatureVariations from DS rules

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Fixes https://github.com/fonttools/fonttools/issues/1176
This commit is contained in:
Cosimo Lupo 2018-09-12 19:59:29 +02:00
parent 26ddbcfe46
commit 9f18570aac
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GPG Key ID: 59D54DB0C9976482
1 changed files with 35 additions and 0 deletions
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35
Lib/fontTools/varLib/__init__.py
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@ -35,6 +35,7 @@ from fontTools.varLib import builder, models, varStore
from fontTools.varLib.merger import VariationMerger, _all_equal
from fontTools.varLib.mvar import MVAR_ENTRIES
from fontTools.varLib.iup import iup_delta_optimize
from fontTools.varLib.featureVars import addFeatureVariations
from fontTools.designspaceLib import DesignSpaceDocument, AxisDescriptor
from collections import OrderedDict, namedtuple
import os.path
@ -567,6 +568,38 @@ def _merge_OTL(font, model, master_fonts, axisTags):
font['GPOS'].table.remap_device_varidxes(varidx_map)
def _add_GSUB_feature_variations(font, axes, internal_axis_supports, rules):
def normalize(name, value):
return models.normalizeLocation(
{name: value}, internal_axis_supports
)[name]
log.info("Generating GSUB FeatureVariations")
axis_tags = {name: axis.tag for name, axis in axes.items()}
conditional_subs = []
for rule in rules:
region = []
for conditions in rule.conditionSets:
space = {}
for condition in conditions:
axis_name = condition["name"]
minimum = normalize(axis_name, condition["minimum"])
maximum = normalize(axis_name, condition["maximum"])
tag = axis_tags[axis_name]
space[tag] = (minimum, maximum)
region.append(space)
subs = {k: v for k, v in rule.subs}
conditional_subs.append((region, subs))
addFeatureVariations(font, conditional_subs)
_DesignSpaceData = namedtuple(
"_DesignSpaceData",
[
@ -713,6 +746,8 @@ def build(designspace_filename, master_finder=lambda s:s, exclude=[], optimize=T
_add_gvar(vf, model, master_fonts, optimize=optimize)
if 'cvar' not in exclude and 'glyf' in vf:
_merge_TTHinting(vf, model, master_fonts)
if 'GSUB' not in exclude and ds.rules:
_add_GSUB_feature_variations(vf, ds.axes, ds.internal_axis_supports, ds.rules)
for tag in exclude:
if tag in vf: