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