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476 lines
19 KiB
Python
476 lines
19 KiB
Python
"""Allows building all the variable fonts of a DesignSpace version 5 by
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splitting the document into interpolable sub-space, then into each VF.
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"""
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from __future__ import annotations
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import itertools
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import logging
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import math
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from typing import Any, Callable, Dict, Iterator, List, Tuple, cast
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from fontTools.designspaceLib import (
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AxisDescriptor,
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AxisMappingDescriptor,
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DesignSpaceDocument,
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DiscreteAxisDescriptor,
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InstanceDescriptor,
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RuleDescriptor,
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SimpleLocationDict,
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SourceDescriptor,
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VariableFontDescriptor,
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)
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from fontTools.designspaceLib.statNames import StatNames, getStatNames
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from fontTools.designspaceLib.types import (
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ConditionSet,
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Range,
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Region,
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getVFUserRegion,
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locationInRegion,
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regionInRegion,
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userRegionToDesignRegion,
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)
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LOGGER = logging.getLogger(__name__)
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MakeInstanceFilenameCallable = Callable[
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[DesignSpaceDocument, InstanceDescriptor, StatNames], str
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]
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def defaultMakeInstanceFilename(
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doc: DesignSpaceDocument, instance: InstanceDescriptor, statNames: StatNames
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) -> str:
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"""Default callable to synthesize an instance filename
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when makeNames=True, for instances that don't specify an instance name
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in the designspace. This part of the name generation can be overriden
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because it's not specified by the STAT table.
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"""
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familyName = instance.familyName or statNames.familyNames.get("en")
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styleName = instance.styleName or statNames.styleNames.get("en")
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return f"{familyName}-{styleName}.ttf"
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def splitInterpolable(
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doc: DesignSpaceDocument,
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makeNames: bool = True,
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expandLocations: bool = True,
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makeInstanceFilename: MakeInstanceFilenameCallable = defaultMakeInstanceFilename,
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) -> Iterator[Tuple[SimpleLocationDict, DesignSpaceDocument]]:
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"""Split the given DS5 into several interpolable sub-designspaces.
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There are as many interpolable sub-spaces as there are combinations of
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discrete axis values.
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E.g. with axes:
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- italic (discrete) Upright or Italic
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- style (discrete) Sans or Serif
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- weight (continuous) 100 to 900
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There are 4 sub-spaces in which the Weight axis should interpolate:
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(Upright, Sans), (Upright, Serif), (Italic, Sans) and (Italic, Serif).
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The sub-designspaces still include the full axis definitions and STAT data,
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but the rules, sources, variable fonts, instances are trimmed down to only
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keep what falls within the interpolable sub-space.
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Args:
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- ``makeNames``: Whether to compute the instance family and style
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names using the STAT data.
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- ``expandLocations``: Whether to turn all locations into "full"
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locations, including implicit default axis values where missing.
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- ``makeInstanceFilename``: Callable to synthesize an instance filename
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when makeNames=True, for instances that don't specify an instance name
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in the designspace. This part of the name generation can be overridden
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because it's not specified by the STAT table.
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.. versionadded:: 5.0
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"""
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discreteAxes = []
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interpolableUserRegion: Region = {}
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for axis in doc.axes:
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if hasattr(axis, "values"):
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# Mypy doesn't support narrowing union types via hasattr()
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# TODO(Python 3.10): use TypeGuard
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# https://mypy.readthedocs.io/en/stable/type_narrowing.html
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axis = cast(DiscreteAxisDescriptor, axis)
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discreteAxes.append(axis)
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else:
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axis = cast(AxisDescriptor, axis)
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interpolableUserRegion[axis.name] = Range(
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axis.minimum,
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axis.maximum,
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axis.default,
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)
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valueCombinations = itertools.product(*[axis.values for axis in discreteAxes])
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for values in valueCombinations:
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discreteUserLocation = {
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discreteAxis.name: value
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for discreteAxis, value in zip(discreteAxes, values)
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}
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subDoc = _extractSubSpace(
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doc,
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{**interpolableUserRegion, **discreteUserLocation},
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keepVFs=True,
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makeNames=makeNames,
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expandLocations=expandLocations,
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makeInstanceFilename=makeInstanceFilename,
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)
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yield discreteUserLocation, subDoc
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def splitVariableFonts(
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doc: DesignSpaceDocument,
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makeNames: bool = False,
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expandLocations: bool = False,
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makeInstanceFilename: MakeInstanceFilenameCallable = defaultMakeInstanceFilename,
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) -> Iterator[Tuple[str, DesignSpaceDocument]]:
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"""Convert each variable font listed in this document into a standalone
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designspace. This can be used to compile all the variable fonts from a
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format 5 designspace using tools that can only deal with 1 VF at a time.
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Args:
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- ``makeNames``: Whether to compute the instance family and style
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names using the STAT data.
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- ``expandLocations``: Whether to turn all locations into "full"
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locations, including implicit default axis values where missing.
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- ``makeInstanceFilename``: Callable to synthesize an instance filename
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when makeNames=True, for instances that don't specify an instance name
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in the designspace. This part of the name generation can be overridden
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because it's not specified by the STAT table.
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.. versionadded:: 5.0
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"""
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# Make one DesignspaceDoc v5 for each variable font
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for vf in doc.getVariableFonts():
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vfUserRegion = getVFUserRegion(doc, vf)
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vfDoc = _extractSubSpace(
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doc,
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vfUserRegion,
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keepVFs=False,
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makeNames=makeNames,
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expandLocations=expandLocations,
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makeInstanceFilename=makeInstanceFilename,
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)
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vfDoc.lib = {**vfDoc.lib, **vf.lib}
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yield vf.name, vfDoc
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def convert5to4(
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doc: DesignSpaceDocument,
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) -> Dict[str, DesignSpaceDocument]:
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"""Convert each variable font listed in this document into a standalone
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format 4 designspace. This can be used to compile all the variable fonts
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from a format 5 designspace using tools that only know about format 4.
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.. versionadded:: 5.0
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"""
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vfs = {}
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for _location, subDoc in splitInterpolable(doc):
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for vfName, vfDoc in splitVariableFonts(subDoc):
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vfDoc.formatVersion = "4.1"
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vfs[vfName] = vfDoc
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return vfs
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def _extractSubSpace(
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doc: DesignSpaceDocument,
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userRegion: Region,
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*,
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keepVFs: bool,
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makeNames: bool,
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expandLocations: bool,
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makeInstanceFilename: MakeInstanceFilenameCallable,
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) -> DesignSpaceDocument:
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subDoc = DesignSpaceDocument()
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# Don't include STAT info
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# FIXME: (Jany) let's think about it. Not include = OK because the point of
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# the splitting is to build VFs and we'll use the STAT data of the full
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# document to generate the STAT of the VFs, so "no need" to have STAT data
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# in sub-docs. Counterpoint: what if someone wants to split this DS for
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# other purposes? Maybe for that it would be useful to also subset the STAT
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# data?
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# subDoc.elidedFallbackName = doc.elidedFallbackName
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def maybeExpandDesignLocation(object):
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if expandLocations:
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return object.getFullDesignLocation(doc)
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else:
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return object.designLocation
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for axis in doc.axes:
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range = userRegion[axis.name]
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if isinstance(range, Range) and hasattr(axis, "minimum"):
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# Mypy doesn't support narrowing union types via hasattr()
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# TODO(Python 3.10): use TypeGuard
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# https://mypy.readthedocs.io/en/stable/type_narrowing.html
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axis = cast(AxisDescriptor, axis)
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subDoc.addAxis(
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AxisDescriptor(
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# Same info
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tag=axis.tag,
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name=axis.name,
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labelNames=axis.labelNames,
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hidden=axis.hidden,
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# Subset range
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minimum=max(range.minimum, axis.minimum),
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default=range.default or axis.default,
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maximum=min(range.maximum, axis.maximum),
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map=[
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(user, design)
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for user, design in axis.map
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if range.minimum <= user <= range.maximum
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],
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# Don't include STAT info
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axisOrdering=None,
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axisLabels=None,
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)
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)
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subDoc.axisMappings = mappings = []
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subDocAxes = {axis.name for axis in subDoc.axes}
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for mapping in doc.axisMappings:
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if not all(axis in subDocAxes for axis in mapping.inputLocation.keys()):
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continue
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if not all(axis in subDocAxes for axis in mapping.outputLocation.keys()):
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LOGGER.error(
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"In axis mapping from input %s, some output axes are not in the variable-font: %s",
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mapping.inputLocation,
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mapping.outputLocation,
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)
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continue
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mappingAxes = set()
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mappingAxes.update(mapping.inputLocation.keys())
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mappingAxes.update(mapping.outputLocation.keys())
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for axis in doc.axes:
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if axis.name not in mappingAxes:
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continue
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range = userRegion[axis.name]
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if (
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range.minimum != axis.minimum
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or (range.default is not None and range.default != axis.default)
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or range.maximum != axis.maximum
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):
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LOGGER.error(
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"Limiting axis ranges used in <mapping> elements not supported: %s",
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axis.name,
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)
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continue
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mappings.append(
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AxisMappingDescriptor(
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inputLocation=mapping.inputLocation,
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outputLocation=mapping.outputLocation,
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)
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)
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# Don't include STAT info
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# subDoc.locationLabels = doc.locationLabels
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# Rules: subset them based on conditions
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designRegion = userRegionToDesignRegion(doc, userRegion)
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subDoc.rules = _subsetRulesBasedOnConditions(doc.rules, designRegion)
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subDoc.rulesProcessingLast = doc.rulesProcessingLast
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# Sources: keep only the ones that fall within the kept axis ranges
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for source in doc.sources:
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if not locationInRegion(doc.map_backward(source.designLocation), userRegion):
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continue
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subDoc.addSource(
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SourceDescriptor(
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filename=source.filename,
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path=source.path,
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font=source.font,
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name=source.name,
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designLocation=_filterLocation(
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userRegion, maybeExpandDesignLocation(source)
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),
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layerName=source.layerName,
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familyName=source.familyName,
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styleName=source.styleName,
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muteKerning=source.muteKerning,
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muteInfo=source.muteInfo,
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mutedGlyphNames=source.mutedGlyphNames,
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)
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)
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# Copy family name translations from the old default source to the new default
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vfDefault = subDoc.findDefault()
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oldDefault = doc.findDefault()
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if vfDefault is not None and oldDefault is not None:
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vfDefault.localisedFamilyName = oldDefault.localisedFamilyName
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# Variable fonts: keep only the ones that fall within the kept axis ranges
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if keepVFs:
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# Note: call getVariableFont() to make the implicit VFs explicit
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for vf in doc.getVariableFonts():
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vfUserRegion = getVFUserRegion(doc, vf)
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if regionInRegion(vfUserRegion, userRegion):
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subDoc.addVariableFont(
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VariableFontDescriptor(
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name=vf.name,
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filename=vf.filename,
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axisSubsets=[
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axisSubset
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for axisSubset in vf.axisSubsets
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if isinstance(userRegion[axisSubset.name], Range)
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],
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lib=vf.lib,
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)
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)
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# Instances: same as Sources + compute missing names
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for instance in doc.instances:
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if not locationInRegion(instance.getFullUserLocation(doc), userRegion):
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continue
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if makeNames:
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statNames = getStatNames(doc, instance.getFullUserLocation(doc))
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familyName = instance.familyName or statNames.familyNames.get("en")
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styleName = instance.styleName or statNames.styleNames.get("en")
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subDoc.addInstance(
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InstanceDescriptor(
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filename=instance.filename
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or makeInstanceFilename(doc, instance, statNames),
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path=instance.path,
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font=instance.font,
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name=instance.name or f"{familyName} {styleName}",
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userLocation={} if expandLocations else instance.userLocation,
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designLocation=_filterLocation(
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userRegion, maybeExpandDesignLocation(instance)
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),
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familyName=familyName,
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styleName=styleName,
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postScriptFontName=instance.postScriptFontName
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or statNames.postScriptFontName,
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styleMapFamilyName=instance.styleMapFamilyName
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or statNames.styleMapFamilyNames.get("en"),
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styleMapStyleName=instance.styleMapStyleName
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or statNames.styleMapStyleName,
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localisedFamilyName=instance.localisedFamilyName
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or statNames.familyNames,
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localisedStyleName=instance.localisedStyleName
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or statNames.styleNames,
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localisedStyleMapFamilyName=instance.localisedStyleMapFamilyName
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or statNames.styleMapFamilyNames,
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localisedStyleMapStyleName=instance.localisedStyleMapStyleName
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or {},
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lib=instance.lib,
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)
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)
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else:
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subDoc.addInstance(
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InstanceDescriptor(
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filename=instance.filename,
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path=instance.path,
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font=instance.font,
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name=instance.name,
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userLocation={} if expandLocations else instance.userLocation,
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designLocation=_filterLocation(
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userRegion, maybeExpandDesignLocation(instance)
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),
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familyName=instance.familyName,
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styleName=instance.styleName,
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postScriptFontName=instance.postScriptFontName,
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styleMapFamilyName=instance.styleMapFamilyName,
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styleMapStyleName=instance.styleMapStyleName,
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localisedFamilyName=instance.localisedFamilyName,
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localisedStyleName=instance.localisedStyleName,
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localisedStyleMapFamilyName=instance.localisedStyleMapFamilyName,
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localisedStyleMapStyleName=instance.localisedStyleMapStyleName,
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lib=instance.lib,
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)
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)
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subDoc.lib = doc.lib
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return subDoc
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def _conditionSetFrom(conditionSet: List[Dict[str, Any]]) -> ConditionSet:
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c: Dict[str, Range] = {}
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for condition in conditionSet:
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minimum, maximum = condition.get("minimum"), condition.get("maximum")
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c[condition["name"]] = Range(
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minimum if minimum is not None else -math.inf,
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maximum if maximum is not None else math.inf,
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)
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return c
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def _subsetRulesBasedOnConditions(
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rules: List[RuleDescriptor], designRegion: Region
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) -> List[RuleDescriptor]:
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# What rules to keep:
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# - Keep the rule if any conditionset is relevant.
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# - A conditionset is relevant if all conditions are relevant or it is empty.
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# - A condition is relevant if
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# - axis is point (C-AP),
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# - and point in condition's range (C-AP-in)
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# (in this case remove the condition because it's always true)
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# - else (C-AP-out) whole conditionset can be discarded (condition false
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# => conditionset false)
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# - axis is range (C-AR),
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# - (C-AR-all) and axis range fully contained in condition range: we can
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# scrap the condition because it's always true
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# - (C-AR-inter) and intersection(axis range, condition range) not empty:
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# keep the condition with the smaller range (= intersection)
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# - (C-AR-none) else, whole conditionset can be discarded
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newRules: List[RuleDescriptor] = []
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for rule in rules:
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newRule: RuleDescriptor = RuleDescriptor(
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name=rule.name, conditionSets=[], subs=rule.subs
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)
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for conditionset in rule.conditionSets:
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cs = _conditionSetFrom(conditionset)
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newConditionset: List[Dict[str, Any]] = []
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discardConditionset = False
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for selectionName, selectionValue in designRegion.items():
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# TODO: Ensure that all(key in conditionset for key in region.keys())?
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if selectionName not in cs:
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# raise Exception("Selection has different axes than the rules")
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continue
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if isinstance(selectionValue, (float, int)): # is point
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# Case C-AP-in
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if selectionValue in cs[selectionName]:
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pass # always matches, conditionset can stay empty for this one.
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# Case C-AP-out
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else:
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discardConditionset = True
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else: # is range
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# Case C-AR-all
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if selectionValue in cs[selectionName]:
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pass # always matches, conditionset can stay empty for this one.
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else:
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intersection = cs[selectionName].intersection(selectionValue)
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# Case C-AR-inter
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if intersection is not None:
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newConditionset.append(
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{
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"name": selectionName,
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"minimum": intersection.minimum,
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"maximum": intersection.maximum,
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}
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)
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# Case C-AR-none
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else:
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discardConditionset = True
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if not discardConditionset:
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newRule.conditionSets.append(newConditionset)
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if newRule.conditionSets:
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newRules.append(newRule)
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return newRules
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def _filterLocation(
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userRegion: Region,
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location: Dict[str, float],
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) -> Dict[str, float]:
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return {
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name: value
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for name, value in location.items()
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if name in userRegion and isinstance(userRegion[name], Range)
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}
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