442 lines
17 KiB
Python
442 lines
17 KiB
Python
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"""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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# 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 an instatiated variable font's name table using the Axis
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Values from the STAT table.
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The updated name table will conform to the R/I/B/BI naming model.
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"""
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# This task can be split into two parts:
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# Task 1: Collecting and sorting the relevant AxisValues:
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# 1. First check the variable font has a STAT table and it contains
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# AxisValues.
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# 2. Create a dictionary which contains the pinned axes from the
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# axisLimits dict and for the unpinned axes, we'll use the fvar
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# default coordinates e.g
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# axisLimits = {"wght": 500, "wdth": AxisRange(75, 100), our dict will
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# be {"wght": 500, "wdth": 100} if the width axis has a default of 100.
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# 3. Create a new list of AxisValues whose Values match the dict we just
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# created.
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# 4. Remove any AxisValues from the list which have the
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# Elidable_AXIS_VALUE_NAME flag set.
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# 5. Remove and sort AxisValues in the list so format 4 AxisValues take
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# precedence. According to the MS Spec "if a format 1, format 2 or
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# format 3 table has a (nominal) value used in a format 4 table that
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# also has values for other axes, the format 4 table, being the more
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# 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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# Task 2: Updating a name table's style and family names from a list of
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# AxisValues:
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# 1. Sort AxisValues into two groups. For the first group, the names must be
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# any of the following ["Regular", "Italic", "Bold", "Bold Italic"].
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# This group of names is often referred to as "RIBBI" names. For the
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# other group, names must be non-RIBBI e.g "Medium Italic", "Condensed"
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# etc.
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# 2. Repeat the next steps for each name table record platform:
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# a. Create new subFamily name and Typographic subFamily name from the
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# above groups.
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# b. Update nameIDs 1, 2, 3, 4, 6, 16, 17 using the new name created
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# in the last step.
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#
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# Step by step example:
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# A variable font which has a width and weight axes.
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# AxisValues in font (represented as simplified dicts):
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# axisValues = [
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# {"name": "Light", "axis": "wght", "value": 300},
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# {"name": "Regular", "axis": "wght", "value": 400},
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# {"name": "Medium", "axis": "wght", "value": 500},
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# {"name": "Bold", "axis": "wght", "value": 600},
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# {"name": "Condensed", "axis": "wdth", "value": 75},
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# {"name": "Normal", "axis": "wdth", "value": 100, "flags": 0x2},
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# ]
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# # Let's instantiate a partial font which has a pinned wght axis and an
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# unpinned width axis.
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# >>> axisLimits = {"wght": 500, "width": AxisRange(75, 100)}
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# >>> updateNameTable(varfont, axisLimits)
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#
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# AxisValues remaining after task 1.3:
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# axisValues = [
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# {"name": "Medium", "axis": "wght", "value": 500},
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# {"name": "Normal", "axis": "wdth", "value": 100, "flags": 0x2}
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# ]
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#
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# AxisValues remaining after completing all 1.x tasks:
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# axisValues = [{"name": "Medium", "axis": "wght", "value": 500}]
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# The Normal AxisValue is removed because it has the
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# Elidable_AXIS_VALUE_NAME flag set.
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#
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# # AxisValues after separating into two groups in task 2.1:
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# ribbiAxisValues = []
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# nonRibbiAxisValues = [{"name": "Medium", "axis": "wght", "value": 500}]
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#
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# # Names created from AxisValues in task 2.2a for Win US English platform:
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# subFamilyName = ""
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# typoSubFamilyName = "Medium"
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#
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# NameRecords updated in task 2.2b for Win US English platform:
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# NameID 1 familyName: "Open Sans" --> "Open Sans Medium"
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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-Medium"
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# NameID 4 Full font name: "Open Sans Regular" --> "Open Sans Medium"
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# NameID 6 PostScript name: "OpenSans-Regular" --> "OpenSans-Medium"
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# NameID 16 Typographic Family name: None --> "Open Sans"
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# NameID 17 Typographic Subfamily name: None --> "Medium"
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#
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# Notes on name table record updates:
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# - Typographic names have been added since Medium is a non-Ribbi name.
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# - Neither the before or after name records include the Width AxisValue
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# names because the "Normal" AxisValue has the
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# Elidable_AXIS_VALUE_NAME flag set.
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# If we instantiate the same font but pin the wdth axis to 75,
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# the "Condensed" AxisValue will be included.
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# - For info regarding how RIBBI and non-RIBBI can be constructed see:
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# https://docs.microsoft.com/en-us/typography/opentype/spec/name#name-ids
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from . import AxisRange, 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 must 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.
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fvarDefaults = {a.axisTag: a.defaultValue for a in fvar.axes}
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defaultAxisCoords = deepcopy(axisLimits)
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for axisTag, val in fvarDefaults.items():
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if axisTag not in defaultAxisCoords or isinstance(
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defaultAxisCoords[axisTag], AxisRange
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):
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defaultAxisCoords[axisTag] = val
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axisValueTables = axisValuesFromAxisLimits(stat, defaultAxisCoords)
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checkAxisValuesExist(stat, axisValueTables, defaultAxisCoords)
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# Remove axis Values which have ELIDABLE_AXIS_VALUE_NAME flag set.
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# Axis Values which have this flag enabled won't be visible in
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# 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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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
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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 and remove duplicates ensuring that format 4 Axis Values
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# are dominant
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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
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# 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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nonFormat4 = [v for v in axisValues if v not in format4]
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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 nonFormat4:
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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 nameIDIsRibbi(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 = nameIDIsRibbi(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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typoSubFamilyName = " ".join(
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getName(n, *platform).toUnicode()
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for n in axisValueNameIDs
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if nonRibbiNameIDs
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)
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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 nameIDIsRibbi(nametable, nameID):
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engNameRecords = any(
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r
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for r in nametable.names
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if (r.platformID, r.platEncID, r.langID) == (3, 1, 0x409)
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)
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if not engNameRecords:
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raise ValueError(
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f"Canot determine if there are RIBBI Axis Value Tables "
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"since there are no name table Records which have "
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"platformID=3, platEncID=1, langID=0x409"
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)
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return (
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True
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if nametable.getName(nameID, 3, 1, 0x409).toUnicode()
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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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currentFamilyName = currentFamilyName.toUnicode()
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currentStyleName = currentStyleName.toUnicode()
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nameIDs = {
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|
NameID.FAMILY_NAME: currentFamilyName,
|
||
|
|
NameID.SUBFAMILY_NAME: subFamilyName,
|
||
|
|
}
|
||
|
|
if typoSubFamilyName:
|
||
|
|
nameIDs[NameID.FAMILY_NAME] = f"{currentFamilyName} {familyNameSuffix}".strip()
|
||
|
|
nameIDs[NameID.TYPOGRAPHIC_FAMILY_NAME] = currentFamilyName
|
||
|
|
nameIDs[NameID.TYPOGRAPHIC_SUBFAMILY_NAME] = f"{typoSubFamilyName}"
|
||
|
|
# Remove previous Typographic Family and SubFamily names since they're
|
||
|
|
# no longer required
|
||
|
|
else:
|
||
|
|
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
|
||
|
|
)
|
||
|
|
nameIDs[NameID.UNIQUE_FONT_IDENTIFIER] = _updateUniqueIdNameRecord(
|
||
|
|
varfont, nameIDs, platform
|
||
|
|
)
|
||
|
|
|
||
|
|
for nameID, string in nameIDs.items():
|
||
|
|
if not string:
|
||
|
|
continue
|
||
|
|
nametable.setName(string, nameID, *platform)
|
||
|
|
|
||
|
|
|
||
|
|
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 currentRecord.toUnicode() in nameRecord.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()
|