389 lines
15 KiB
Python
389 lines
15 KiB
Python
|
"""Helpers for instantiating name table records."""
|
||
|
|
|
||
|
|
from contextlib import contextmanager
|
||
|
|
from copy import deepcopy
|
||
|
|
from enum import IntEnum
|
||
|
|
import re
|
||
|
|
|
||
|
|
|
||
|
|
class NameID(IntEnum):
|
||
|
|
FAMILY_NAME = 1
|
||
|
|
SUBFAMILY_NAME = 2
|
||
|
|
UNIQUE_FONT_IDENTIFIER = 3
|
||
|
|
FULL_FONT_NAME = 4
|
||
|
|
VERSION_STRING = 5
|
||
|
|
POSTSCRIPT_NAME = 6
|
||
|
|
TYPOGRAPHIC_FAMILY_NAME = 16
|
||
|
|
TYPOGRAPHIC_SUBFAMILY_NAME = 17
|
||
|
|
VARIATIONS_POSTSCRIPT_NAME_PREFIX = 25
|
||
|
|
|
||
|
|
|
||
|
|
ELIDABLE_AXIS_VALUE_NAME = 2
|
||
|
|
|
||
|
|
|
||
|
|
def getVariationNameIDs(varfont):
|
||
|
|
used = []
|
||
|
|
if "fvar" in varfont:
|
||
|
|
fvar = varfont["fvar"]
|
||
|
|
for axis in fvar.axes:
|
||
|
|
used.append(axis.axisNameID)
|
||
|
|
for instance in fvar.instances:
|
||
|
|
used.append(instance.subfamilyNameID)
|
||
|
|
if instance.postscriptNameID != 0xFFFF:
|
||
|
|
used.append(instance.postscriptNameID)
|
||
|
|
if "STAT" in varfont:
|
||
|
|
stat = varfont["STAT"].table
|
||
|
|
for axis in stat.DesignAxisRecord.Axis if stat.DesignAxisRecord else ():
|
||
|
|
used.append(axis.AxisNameID)
|
||
|
|
for value in stat.AxisValueArray.AxisValue if stat.AxisValueArray else ():
|
||
|
|
used.append(value.ValueNameID)
|
||
|
|
elidedFallbackNameID = getattr(stat, "ElidedFallbackNameID", None)
|
||
|
|
if elidedFallbackNameID is not None:
|
||
|
|
used.append(elidedFallbackNameID)
|
||
|
|
# nameIDs <= 255 are reserved by OT spec so we don't touch them
|
||
|
|
return {nameID for nameID in used if nameID > 255}
|
||
|
|
|
||
|
|
|
||
|
|
@contextmanager
|
||
|
|
def pruningUnusedNames(varfont):
|
||
|
|
from . import log
|
||
|
|
|
||
|
|
origNameIDs = getVariationNameIDs(varfont)
|
||
|
|
|
||
|
|
yield
|
||
|
|
|
||
|
|
log.info("Pruning name table")
|
||
|
|
exclude = origNameIDs - getVariationNameIDs(varfont)
|
||
|
|
varfont["name"].names[:] = [
|
||
|
|
record for record in varfont["name"].names if record.nameID not in exclude
|
||
|
|
]
|
||
|
|
if "ltag" in varfont:
|
||
|
|
# Drop the whole 'ltag' table if all the language-dependent Unicode name
|
||
|
|
# records that reference it have been dropped.
|
||
|
|
# TODO: Only prune unused ltag tags, renumerating langIDs accordingly.
|
||
|
|
# Note ltag can also be used by feat or morx tables, so check those too.
|
||
|
|
if not any(
|
||
|
|
record
|
||
|
|
for record in varfont["name"].names
|
||
|
|
if record.platformID == 0 and record.langID != 0xFFFF
|
||
|
|
):
|
||
|
|
del varfont["ltag"]
|
||
|
|
|
||
|
|
|
||
|
|
def updateNameTable(varfont, axisLimits):
|
||
|
|
"""Update instatiated variable font's name table using STAT AxisValues.
|
||
|
|
|
||
|
|
Raises ValueError if the STAT table is missing or an Axis Value table is
|
||
|
|
missing for requested axis locations.
|
||
|
|
|
||
|
|
First, collect all STAT AxisValues that match the new default axis locations
|
||
|
|
(excluding "elided" ones); concatenate the strings in design axis order,
|
||
|
|
while giving priority to "synthetic" values (Format 4), to form the
|
||
|
|
typographic subfamily name associated with the new default instance.
|
||
|
|
Finally, update all related records in the name table, making sure that
|
||
|
|
legacy family/sub-family names conform to the the R/I/B/BI (Regular, Italic,
|
||
|
|
Bold, Bold Italic) naming model.
|
||
|
|
|
||
|
|
Example: Updating a partial variable font:
|
||
|
|
| >>> ttFont = TTFont("OpenSans[wdth,wght].ttf")
|
||
|
|
| >>> updateNameTable(ttFont, {"wght": (400, 900), "wdth": 75})
|
||
|
|
|
||
|
|
The name table records will be updated in the following manner:
|
||
|
|
NameID 1 familyName: "Open Sans" --> "Open Sans Condensed"
|
||
|
|
NameID 2 subFamilyName: "Regular" --> "Regular"
|
||
|
|
NameID 3 Unique font identifier: "3.000;GOOG;OpenSans-Regular" --> \
|
||
|
|
"3.000;GOOG;OpenSans-Condensed"
|
||
|
|
NameID 4 Full font name: "Open Sans Regular" --> "Open Sans Condensed"
|
||
|
|
NameID 6 PostScript name: "OpenSans-Regular" --> "OpenSans-Condensed"
|
||
|
|
NameID 16 Typographic Family name: None --> "Open Sans"
|
||
|
|
NameID 17 Typographic Subfamily name: None --> "Condensed"
|
||
|
|
|
||
|
|
References:
|
||
|
|
https://docs.microsoft.com/en-us/typography/opentype/spec/stat
|
||
|
|
https://docs.microsoft.com/en-us/typography/opentype/spec/name#name-ids
|
||
|
|
"""
|
||
|
|
from . import AxisLimits, axisValuesFromAxisLimits
|
||
|
|
|
||
|
|
if "STAT" not in varfont:
|
||
|
|
raise ValueError("Cannot update name table since there is no STAT table.")
|
||
|
|
stat = varfont["STAT"].table
|
||
|
|
if not stat.AxisValueArray:
|
||
|
|
raise ValueError("Cannot update name table since there are no STAT Axis Values")
|
||
|
|
fvar = varfont["fvar"]
|
||
|
|
|
||
|
|
# The updated name table will reflect the new 'zero origin' of the font.
|
||
|
|
# If we're instantiating a partial font, we will populate the unpinned
|
||
|
|
# axes with their default axis values from fvar.
|
||
|
|
axisLimits = AxisLimits(axisLimits).limitAxesAndPopulateDefaults(varfont)
|
||
|
|
partialDefaults = axisLimits.defaultLocation()
|
||
|
|
fvarDefaults = {a.axisTag: a.defaultValue for a in fvar.axes}
|
||
|
|
defaultAxisCoords = AxisLimits({**fvarDefaults, **partialDefaults})
|
||
|
|
assert all(v.minimum == v.maximum for v in defaultAxisCoords.values())
|
||
|
|
|
||
|
|
axisValueTables = axisValuesFromAxisLimits(stat, defaultAxisCoords)
|
||
|
|
checkAxisValuesExist(stat, axisValueTables, defaultAxisCoords.pinnedLocation())
|
||
|
|
|
||
|
|
# ignore "elidable" axis values, should be omitted in application font menus.
|
||
|
|
axisValueTables = [
|
||
|
|
v for v in axisValueTables if not v.Flags & ELIDABLE_AXIS_VALUE_NAME
|
||
|
|
]
|
||
|
|
axisValueTables = _sortAxisValues(axisValueTables)
|
||
|
|
_updateNameRecords(varfont, axisValueTables)
|
||
|
|
|
||
|
|
|
||
|
|
def checkAxisValuesExist(stat, axisValues, axisCoords):
|
||
|
|
seen = set()
|
||
|
|
designAxes = stat.DesignAxisRecord.Axis
|
||
|
|
hasValues = set()
|
||
|
|
for value in stat.AxisValueArray.AxisValue:
|
||
|
|
if value.Format in (1, 2, 3):
|
||
|
|
hasValues.add(designAxes[value.AxisIndex].AxisTag)
|
||
|
|
elif value.Format == 4:
|
||
|
|
for rec in value.AxisValueRecord:
|
||
|
|
hasValues.add(designAxes[rec.AxisIndex].AxisTag)
|
||
|
|
|
||
|
|
for axisValueTable in axisValues:
|
||
|
|
axisValueFormat = axisValueTable.Format
|
||
|
|
if axisValueTable.Format in (1, 2, 3):
|
||
|
|
axisTag = designAxes[axisValueTable.AxisIndex].AxisTag
|
||
|
|
if axisValueFormat == 2:
|
||
|
|
axisValue = axisValueTable.NominalValue
|
||
|
|
else:
|
||
|
|
axisValue = axisValueTable.Value
|
||
|
|
if axisTag in axisCoords and axisValue == axisCoords[axisTag]:
|
||
|
|
seen.add(axisTag)
|
||
|
|
elif axisValueTable.Format == 4:
|
||
|
|
for rec in axisValueTable.AxisValueRecord:
|
||
|
|
axisTag = designAxes[rec.AxisIndex].AxisTag
|
||
|
|
if axisTag in axisCoords and rec.Value == axisCoords[axisTag]:
|
||
|
|
seen.add(axisTag)
|
||
|
|
|
||
|
|
missingAxes = (set(axisCoords) - seen) & hasValues
|
||
|
|
if missingAxes:
|
||
|
|
missing = ", ".join(f"'{i}': {axisCoords[i]}" for i in missingAxes)
|
||
|
|
raise ValueError(f"Cannot find Axis Values {{{missing}}}")
|
||
|
|
|
||
|
|
|
||
|
|
def _sortAxisValues(axisValues):
|
||
|
|
# Sort by axis index, remove duplicates and ensure that format 4 AxisValues
|
||
|
|
# are dominant.
|
||
|
|
# The MS Spec states: "if a format 1, format 2 or format 3 table has a
|
||
|
|
# (nominal) value used in a format 4 table that also has values for
|
||
|
|
# other axes, the format 4 table, being the more specific match, is used",
|
||
|
|
# https://docs.microsoft.com/en-us/typography/opentype/spec/stat#axis-value-table-format-4
|
||
|
|
results = []
|
||
|
|
seenAxes = set()
|
||
|
|
# Sort format 4 axes so the tables with the most AxisValueRecords are first
|
||
|
|
format4 = sorted(
|
||
|
|
[v for v in axisValues if v.Format == 4],
|
||
|
|
key=lambda v: len(v.AxisValueRecord),
|
||
|
|
reverse=True,
|
||
|
|
)
|
||
|
|
|
||
|
|
for val in format4:
|
||
|
|
axisIndexes = set(r.AxisIndex for r in val.AxisValueRecord)
|
||
|
|
minIndex = min(axisIndexes)
|
||
|
|
if not seenAxes & axisIndexes:
|
||
|
|
seenAxes |= axisIndexes
|
||
|
|
results.append((minIndex, val))
|
||
|
|
|
||
|
|
for val in axisValues:
|
||
|
|
if val in format4:
|
||
|
|
continue
|
||
|
|
axisIndex = val.AxisIndex
|
||
|
|
if axisIndex not in seenAxes:
|
||
|
|
seenAxes.add(axisIndex)
|
||
|
|
results.append((axisIndex, val))
|
||
|
|
|
||
|
|
return [axisValue for _, axisValue in sorted(results)]
|
||
|
|
|
||
|
|
|
||
|
|
def _updateNameRecords(varfont, axisValues):
|
||
|
|
# Update nametable based on the axisValues using the R/I/B/BI model.
|
||
|
|
nametable = varfont["name"]
|
||
|
|
stat = varfont["STAT"].table
|
||
|
|
|
||
|
|
axisValueNameIDs = [a.ValueNameID for a in axisValues]
|
||
|
|
ribbiNameIDs = [n for n in axisValueNameIDs if _isRibbi(nametable, n)]
|
||
|
|
nonRibbiNameIDs = [n for n in axisValueNameIDs if n not in ribbiNameIDs]
|
||
|
|
elidedNameID = stat.ElidedFallbackNameID
|
||
|
|
elidedNameIsRibbi = _isRibbi(nametable, elidedNameID)
|
||
|
|
|
||
|
|
getName = nametable.getName
|
||
|
|
platforms = set((r.platformID, r.platEncID, r.langID) for r in nametable.names)
|
||
|
|
for platform in platforms:
|
||
|
|
if not all(getName(i, *platform) for i in (1, 2, elidedNameID)):
|
||
|
|
# Since no family name and subfamily name records were found,
|
||
|
|
# we cannot update this set of name Records.
|
||
|
|
continue
|
||
|
|
|
||
|
|
subFamilyName = " ".join(
|
||
|
|
getName(n, *platform).toUnicode() for n in ribbiNameIDs
|
||
|
|
)
|
||
|
|
if nonRibbiNameIDs:
|
||
|
|
typoSubFamilyName = " ".join(
|
||
|
|
getName(n, *platform).toUnicode() for n in axisValueNameIDs
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
typoSubFamilyName = None
|
||
|
|
|
||
|
|
# If neither subFamilyName and typographic SubFamilyName exist,
|
||
|
|
# we will use the STAT's elidedFallbackName
|
||
|
|
if not typoSubFamilyName and not subFamilyName:
|
||
|
|
if elidedNameIsRibbi:
|
||
|
|
subFamilyName = getName(elidedNameID, *platform).toUnicode()
|
||
|
|
else:
|
||
|
|
typoSubFamilyName = getName(elidedNameID, *platform).toUnicode()
|
||
|
|
|
||
|
|
familyNameSuffix = " ".join(
|
||
|
|
getName(n, *platform).toUnicode() for n in nonRibbiNameIDs
|
||
|
|
)
|
||
|
|
|
||
|
|
_updateNameTableStyleRecords(
|
||
|
|
varfont,
|
||
|
|
familyNameSuffix,
|
||
|
|
subFamilyName,
|
||
|
|
typoSubFamilyName,
|
||
|
|
*platform,
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def _isRibbi(nametable, nameID):
|
||
|
|
englishRecord = nametable.getName(nameID, 3, 1, 0x409)
|
||
|
|
return (
|
||
|
|
True
|
||
|
|
if englishRecord is not None
|
||
|
|
and englishRecord.toUnicode() in ("Regular", "Italic", "Bold", "Bold Italic")
|
||
|
|
else False
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def _updateNameTableStyleRecords(
|
||
|
|
varfont,
|
||
|
|
familyNameSuffix,
|
||
|
|
subFamilyName,
|
||
|
|
typoSubFamilyName,
|
||
|
|
platformID=3,
|
||
|
|
platEncID=1,
|
||
|
|
langID=0x409,
|
||
|
|
):
|
||
|
|
# TODO (Marc F) It may be nice to make this part a standalone
|
||
|
|
# font renamer in the future.
|
||
|
|
nametable = varfont["name"]
|
||
|
|
platform = (platformID, platEncID, langID)
|
||
|
|
|
||
|
|
currentFamilyName = nametable.getName(
|
||
|
|
NameID.TYPOGRAPHIC_FAMILY_NAME, *platform
|
||
|
|
) or nametable.getName(NameID.FAMILY_NAME, *platform)
|
||
|
|
|
||
|
|
currentStyleName = nametable.getName(
|
||
|
|
NameID.TYPOGRAPHIC_SUBFAMILY_NAME, *platform
|
||
|
|
) or nametable.getName(NameID.SUBFAMILY_NAME, *platform)
|
||
|
|
|
||
|
|
if not all([currentFamilyName, currentStyleName]):
|
||
|
|
raise ValueError(f"Missing required NameIDs 1 and 2 for platform {platform}")
|
||
|
|
|
||
|
|
currentFamilyName = currentFamilyName.toUnicode()
|
||
|
|
currentStyleName = currentStyleName.toUnicode()
|
||
|
|
|
||
|
|
nameIDs = {
|
||
|
|
NameID.FAMILY_NAME: currentFamilyName,
|
||
|
|
NameID.SUBFAMILY_NAME: subFamilyName or "Regular",
|
||
|
|
}
|
||
|
|
if typoSubFamilyName:
|
||
|
|
nameIDs[NameID.FAMILY_NAME] = f"{currentFamilyName} {familyNameSuffix}".strip()
|
||
|
|
nameIDs[NameID.TYPOGRAPHIC_FAMILY_NAME] = currentFamilyName
|
||
|
|
nameIDs[NameID.TYPOGRAPHIC_SUBFAMILY_NAME] = typoSubFamilyName
|
||
|
|
else:
|
||
|
|
# Remove previous Typographic Family and SubFamily names since they're
|
||
|
|
# no longer required
|
||
|
|
for nameID in (
|
||
|
|
NameID.TYPOGRAPHIC_FAMILY_NAME,
|
||
|
|
NameID.TYPOGRAPHIC_SUBFAMILY_NAME,
|
||
|
|
):
|
||
|
|
nametable.removeNames(nameID=nameID)
|
||
|
|
|
||
|
|
newFamilyName = (
|
||
|
|
nameIDs.get(NameID.TYPOGRAPHIC_FAMILY_NAME) or nameIDs[NameID.FAMILY_NAME]
|
||
|
|
)
|
||
|
|
newStyleName = (
|
||
|
|
nameIDs.get(NameID.TYPOGRAPHIC_SUBFAMILY_NAME) or nameIDs[NameID.SUBFAMILY_NAME]
|
||
|
|
)
|
||
|
|
|
||
|
|
nameIDs[NameID.FULL_FONT_NAME] = f"{newFamilyName} {newStyleName}"
|
||
|
|
nameIDs[NameID.POSTSCRIPT_NAME] = _updatePSNameRecord(
|
||
|
|
varfont, newFamilyName, newStyleName, platform
|
||
|
|
)
|
||
|
|
|
||
|
|
uniqueID = _updateUniqueIdNameRecord(varfont, nameIDs, platform)
|
||
|
|
if uniqueID:
|
||
|
|
nameIDs[NameID.UNIQUE_FONT_IDENTIFIER] = uniqueID
|
||
|
|
|
||
|
|
for nameID, string in nameIDs.items():
|
||
|
|
assert string, nameID
|
||
|
|
nametable.setName(string, nameID, *platform)
|
||
|
|
|
||
|
|
if "fvar" not in varfont:
|
||
|
|
nametable.removeNames(NameID.VARIATIONS_POSTSCRIPT_NAME_PREFIX)
|
||
|
|
|
||
|
|
|
||
|
|
def _updatePSNameRecord(varfont, familyName, styleName, platform):
|
||
|
|
# Implementation based on Adobe Technical Note #5902 :
|
||
|
|
# https://wwwimages2.adobe.com/content/dam/acom/en/devnet/font/pdfs/5902.AdobePSNameGeneration.pdf
|
||
|
|
nametable = varfont["name"]
|
||
|
|
|
||
|
|
family_prefix = nametable.getName(
|
||
|
|
NameID.VARIATIONS_POSTSCRIPT_NAME_PREFIX, *platform
|
||
|
|
)
|
||
|
|
if family_prefix:
|
||
|
|
family_prefix = family_prefix.toUnicode()
|
||
|
|
else:
|
||
|
|
family_prefix = familyName
|
||
|
|
|
||
|
|
psName = f"{family_prefix}-{styleName}"
|
||
|
|
# Remove any characters other than uppercase Latin letters, lowercase
|
||
|
|
# Latin letters, digits and hyphens.
|
||
|
|
psName = re.sub(r"[^A-Za-z0-9-]", r"", psName)
|
||
|
|
|
||
|
|
if len(psName) > 127:
|
||
|
|
# Abbreviating the stylename so it fits within 127 characters whilst
|
||
|
|
# conforming to every vendor's specification is too complex. Instead
|
||
|
|
# we simply truncate the psname and add the required "..."
|
||
|
|
return f"{psName[:124]}..."
|
||
|
|
return psName
|
||
|
|
|
||
|
|
|
||
|
|
def _updateUniqueIdNameRecord(varfont, nameIDs, platform):
|
||
|
|
nametable = varfont["name"]
|
||
|
|
currentRecord = nametable.getName(NameID.UNIQUE_FONT_IDENTIFIER, *platform)
|
||
|
|
if not currentRecord:
|
||
|
|
return None
|
||
|
|
|
||
|
|
# Check if full name and postscript name are a substring of currentRecord
|
||
|
|
for nameID in (NameID.FULL_FONT_NAME, NameID.POSTSCRIPT_NAME):
|
||
|
|
nameRecord = nametable.getName(nameID, *platform)
|
||
|
|
if not nameRecord:
|
||
|
|
continue
|
||
|
|
if nameRecord.toUnicode() in currentRecord.toUnicode():
|
||
|
|
return currentRecord.toUnicode().replace(
|
||
|
|
nameRecord.toUnicode(), nameIDs[nameRecord.nameID]
|
||
|
|
)
|
||
|
|
|
||
|
|
# Create a new string since we couldn't find any substrings.
|
||
|
|
fontVersion = _fontVersion(varfont, platform)
|
||
|
|
achVendID = varfont["OS/2"].achVendID
|
||
|
|
# Remove non-ASCII characers and trailing spaces
|
||
|
|
vendor = re.sub(r"[^\x00-\x7F]", "", achVendID).strip()
|
||
|
|
psName = nameIDs[NameID.POSTSCRIPT_NAME]
|
||
|
|
return f"{fontVersion};{vendor};{psName}"
|
||
|
|
|
||
|
|
|
||
|
|
def _fontVersion(font, platform=(3, 1, 0x409)):
|
||
|
|
nameRecord = font["name"].getName(NameID.VERSION_STRING, *platform)
|
||
|
|
if nameRecord is None:
|
||
|
|
return f'{font["head"].fontRevision:.3f}'
|
||
|
|
# "Version 1.101; ttfautohint (v1.8.1.43-b0c9)" --> "1.101"
|
||
|
|
# Also works fine with inputs "Version 1.101" or "1.101" etc
|
||
|
|
versionNumber = nameRecord.toUnicode().split(";")[0]
|
||
|
|
return versionNumber.lstrip("Version ").strip()
|