486 lines
17 KiB
Python
486 lines
17 KiB
Python
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"""GlyphSets returned by a TTFont."""
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from abc import ABC, abstractmethod
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from collections.abc import Mapping
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from contextlib import contextmanager
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from copy import copy, deepcopy
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from types import SimpleNamespace
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from fontTools.misc.vector import Vector
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from fontTools.misc.fixedTools import otRound, fixedToFloat as fi2fl
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from fontTools.misc.loggingTools import deprecateFunction
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from fontTools.misc.transform import Transform, DecomposedTransform
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from fontTools.pens.transformPen import TransformPen, TransformPointPen
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from fontTools.pens.recordingPen import (
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DecomposingRecordingPen,
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lerpRecordings,
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replayRecording,
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)
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class _TTGlyphSet(Mapping):
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"""Generic dict-like GlyphSet class that pulls metrics from hmtx and
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glyph shape from TrueType or CFF.
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"""
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def __init__(self, font, location, glyphsMapping, *, recalcBounds=True):
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self.recalcBounds = recalcBounds
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self.font = font
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self.defaultLocationNormalized = (
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{axis.axisTag: 0 for axis in self.font["fvar"].axes}
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if "fvar" in self.font
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else {}
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)
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self.location = location if location is not None else {}
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self.rawLocation = {} # VarComponent-only location
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self.originalLocation = location if location is not None else {}
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self.depth = 0
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self.locationStack = []
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self.rawLocationStack = []
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self.glyphsMapping = glyphsMapping
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self.hMetrics = font["hmtx"].metrics
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self.vMetrics = getattr(font.get("vmtx"), "metrics", None)
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self.hvarTable = None
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if location:
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from fontTools.varLib.varStore import VarStoreInstancer
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self.hvarTable = getattr(font.get("HVAR"), "table", None)
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if self.hvarTable is not None:
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self.hvarInstancer = VarStoreInstancer(
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self.hvarTable.VarStore, font["fvar"].axes, location
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)
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# TODO VVAR, VORG
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@contextmanager
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def pushLocation(self, location, reset: bool):
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self.locationStack.append(self.location)
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self.rawLocationStack.append(self.rawLocation)
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if reset:
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self.location = self.originalLocation.copy()
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self.rawLocation = self.defaultLocationNormalized.copy()
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else:
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self.location = self.location.copy()
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self.rawLocation = {}
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self.location.update(location)
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self.rawLocation.update(location)
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try:
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yield None
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finally:
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self.location = self.locationStack.pop()
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self.rawLocation = self.rawLocationStack.pop()
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@contextmanager
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def pushDepth(self):
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try:
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depth = self.depth
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self.depth += 1
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yield depth
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finally:
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self.depth -= 1
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def __contains__(self, glyphName):
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return glyphName in self.glyphsMapping
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def __iter__(self):
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return iter(self.glyphsMapping.keys())
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def __len__(self):
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return len(self.glyphsMapping)
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@deprecateFunction(
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"use 'glyphName in glyphSet' instead", category=DeprecationWarning
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)
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def has_key(self, glyphName):
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return glyphName in self.glyphsMapping
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class _TTGlyphSetGlyf(_TTGlyphSet):
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def __init__(self, font, location, recalcBounds=True):
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self.glyfTable = font["glyf"]
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super().__init__(font, location, self.glyfTable, recalcBounds=recalcBounds)
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self.gvarTable = font.get("gvar")
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def __getitem__(self, glyphName):
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return _TTGlyphGlyf(self, glyphName, recalcBounds=self.recalcBounds)
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class _TTGlyphSetGlyf(_TTGlyphSet):
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def __init__(self, font, location, recalcBounds=True):
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self.glyfTable = font["glyf"]
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super().__init__(font, location, self.glyfTable, recalcBounds=recalcBounds)
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self.gvarTable = font.get("gvar")
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def __getitem__(self, glyphName):
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return _TTGlyphGlyf(self, glyphName, recalcBounds=self.recalcBounds)
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class _TTGlyphSetCFF(_TTGlyphSet):
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def __init__(self, font, location):
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tableTag = "CFF2" if "CFF2" in font else "CFF "
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self.charStrings = list(font[tableTag].cff.values())[0].CharStrings
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super().__init__(font, location, self.charStrings)
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self.blender = None
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if location:
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from fontTools.varLib.varStore import VarStoreInstancer
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varStore = getattr(self.charStrings, "varStore", None)
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if varStore is not None:
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instancer = VarStoreInstancer(
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varStore.otVarStore, font["fvar"].axes, location
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)
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self.blender = instancer.interpolateFromDeltas
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def __getitem__(self, glyphName):
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return _TTGlyphCFF(self, glyphName)
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class _TTGlyphSetVARC(_TTGlyphSet):
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def __init__(self, font, location, glyphSet):
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self.glyphSet = glyphSet
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super().__init__(font, location, glyphSet)
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self.varcTable = font["VARC"].table
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def __getitem__(self, glyphName):
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varc = self.varcTable
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if glyphName not in varc.Coverage.glyphs:
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return self.glyphSet[glyphName]
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return _TTGlyphVARC(self, glyphName)
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class _TTGlyph(ABC):
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"""Glyph object that supports the Pen protocol, meaning that it has
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.draw() and .drawPoints() methods that take a pen object as their only
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argument. Additionally there are 'width' and 'lsb' attributes, read from
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the 'hmtx' table.
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If the font contains a 'vmtx' table, there will also be 'height' and 'tsb'
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attributes.
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"""
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def __init__(self, glyphSet, glyphName, *, recalcBounds=True):
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self.glyphSet = glyphSet
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self.name = glyphName
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self.recalcBounds = recalcBounds
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self.width, self.lsb = glyphSet.hMetrics[glyphName]
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if glyphSet.vMetrics is not None:
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self.height, self.tsb = glyphSet.vMetrics[glyphName]
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else:
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self.height, self.tsb = None, None
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if glyphSet.location and glyphSet.hvarTable is not None:
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varidx = (
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glyphSet.font.getGlyphID(glyphName)
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if glyphSet.hvarTable.AdvWidthMap is None
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else glyphSet.hvarTable.AdvWidthMap.mapping[glyphName]
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)
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self.width += glyphSet.hvarInstancer[varidx]
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# TODO: VVAR/VORG
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@abstractmethod
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def draw(self, pen):
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"""Draw the glyph onto ``pen``. See fontTools.pens.basePen for details
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how that works.
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"""
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raise NotImplementedError
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def drawPoints(self, pen):
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"""Draw the glyph onto ``pen``. See fontTools.pens.pointPen for details
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how that works.
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"""
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from fontTools.pens.pointPen import SegmentToPointPen
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self.draw(SegmentToPointPen(pen))
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class _TTGlyphGlyf(_TTGlyph):
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def draw(self, pen):
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"""Draw the glyph onto ``pen``. See fontTools.pens.basePen for details
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how that works.
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"""
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glyph, offset = self._getGlyphAndOffset()
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with self.glyphSet.pushDepth() as depth:
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if depth:
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offset = 0 # Offset should only apply at top-level
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glyph.draw(pen, self.glyphSet.glyfTable, offset)
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def drawPoints(self, pen):
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"""Draw the glyph onto ``pen``. See fontTools.pens.pointPen for details
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how that works.
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"""
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glyph, offset = self._getGlyphAndOffset()
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with self.glyphSet.pushDepth() as depth:
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if depth:
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offset = 0 # Offset should only apply at top-level
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glyph.drawPoints(pen, self.glyphSet.glyfTable, offset)
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def _getGlyphAndOffset(self):
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if self.glyphSet.location and self.glyphSet.gvarTable is not None:
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glyph = self._getGlyphInstance()
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else:
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glyph = self.glyphSet.glyfTable[self.name]
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offset = self.lsb - glyph.xMin if hasattr(glyph, "xMin") else 0
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return glyph, offset
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def _getGlyphInstance(self):
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from fontTools.varLib.iup import iup_delta
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from fontTools.ttLib.tables._g_l_y_f import GlyphCoordinates
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from fontTools.varLib.models import supportScalar
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glyphSet = self.glyphSet
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glyfTable = glyphSet.glyfTable
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variations = glyphSet.gvarTable.variations[self.name]
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hMetrics = glyphSet.hMetrics
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vMetrics = glyphSet.vMetrics
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coordinates, _ = glyfTable._getCoordinatesAndControls(
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self.name, hMetrics, vMetrics
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)
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origCoords, endPts = None, None
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for var in variations:
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scalar = supportScalar(glyphSet.location, var.axes)
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if not scalar:
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continue
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delta = var.coordinates
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if None in delta:
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if origCoords is None:
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origCoords, control = glyfTable._getCoordinatesAndControls(
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self.name, hMetrics, vMetrics
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)
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endPts = (
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control[1] if control[0] >= 1 else list(range(len(control[1])))
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)
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delta = iup_delta(delta, origCoords, endPts)
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coordinates += GlyphCoordinates(delta) * scalar
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glyph = copy(glyfTable[self.name]) # Shallow copy
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width, lsb, height, tsb = _setCoordinates(
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glyph, coordinates, glyfTable, recalcBounds=self.recalcBounds
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)
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self.lsb = lsb
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self.tsb = tsb
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if glyphSet.hvarTable is None:
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# no HVAR: let's set metrics from the phantom points
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self.width = width
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self.height = height
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return glyph
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class _TTGlyphCFF(_TTGlyph):
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def draw(self, pen):
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"""Draw the glyph onto ``pen``. See fontTools.pens.basePen for details
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how that works.
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"""
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self.glyphSet.charStrings[self.name].draw(pen, self.glyphSet.blender)
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def _evaluateCondition(condition, fvarAxes, location, instancer):
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if condition.Format == 1:
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# ConditionAxisRange
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axisIndex = condition.AxisIndex
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axisTag = fvarAxes[axisIndex].axisTag
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axisValue = location.get(axisTag, 0)
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minValue = condition.FilterRangeMinValue
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maxValue = condition.FilterRangeMaxValue
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return minValue <= axisValue <= maxValue
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elif condition.Format == 2:
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# ConditionValue
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value = condition.DefaultValue
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value += instancer[condition.VarIdx][0]
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return value > 0
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elif condition.Format == 3:
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# ConditionAnd
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for subcondition in condition.ConditionTable:
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if not _evaluateCondition(subcondition, fvarAxes, location, instancer):
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return False
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return True
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elif condition.Format == 4:
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# ConditionOr
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for subcondition in condition.ConditionTable:
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if _evaluateCondition(subcondition, fvarAxes, location, instancer):
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return True
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return False
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elif condition.Format == 5:
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# ConditionNegate
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return not _evaluateCondition(
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condition.conditionTable, fvarAxes, location, instancer
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)
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else:
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return False # Unkonwn condition format
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class _TTGlyphVARC(_TTGlyph):
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def _draw(self, pen, isPointPen):
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"""Draw the glyph onto ``pen``. See fontTools.pens.basePen for details
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how that works.
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"""
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from fontTools.ttLib.tables.otTables import (
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VarComponentFlags,
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NO_VARIATION_INDEX,
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)
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glyphSet = self.glyphSet
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varc = glyphSet.varcTable
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idx = varc.Coverage.glyphs.index(self.name)
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glyph = varc.VarCompositeGlyphs.VarCompositeGlyph[idx]
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from fontTools.varLib.multiVarStore import MultiVarStoreInstancer
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from fontTools.varLib.varStore import VarStoreInstancer
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fvarAxes = glyphSet.font["fvar"].axes
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instancer = MultiVarStoreInstancer(
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varc.MultiVarStore, fvarAxes, self.glyphSet.location
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)
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for comp in glyph.components:
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if comp.flags & VarComponentFlags.HAVE_CONDITION:
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condition = varc.ConditionList.ConditionTable[comp.conditionIndex]
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if not _evaluateCondition(
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condition, fvarAxes, self.glyphSet.location, instancer
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):
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continue
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location = {}
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if comp.axisIndicesIndex is not None:
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axisIndices = varc.AxisIndicesList.Item[comp.axisIndicesIndex]
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axisValues = Vector(comp.axisValues)
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if comp.axisValuesVarIndex != NO_VARIATION_INDEX:
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axisValues += fi2fl(instancer[comp.axisValuesVarIndex], 14)
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assert len(axisIndices) == len(axisValues), (
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len(axisIndices),
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len(axisValues),
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)
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location = {
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fvarAxes[i].axisTag: v for i, v in zip(axisIndices, axisValues)
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}
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if comp.transformVarIndex != NO_VARIATION_INDEX:
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deltas = instancer[comp.transformVarIndex]
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comp = deepcopy(comp)
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comp.applyTransformDeltas(deltas)
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transform = comp.transform
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reset = comp.flags & VarComponentFlags.RESET_UNSPECIFIED_AXES
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with self.glyphSet.glyphSet.pushLocation(location, reset):
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with self.glyphSet.pushLocation(location, reset):
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shouldDecompose = self.name == comp.glyphName
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if not shouldDecompose:
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try:
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pen.addVarComponent(
|
||
|
|
comp.glyphName, transform, self.glyphSet.rawLocation
|
||
|
|
)
|
||
|
|
except AttributeError:
|
||
|
|
shouldDecompose = True
|
||
|
|
|
||
|
|
if shouldDecompose:
|
||
|
|
t = transform.toTransform()
|
||
|
|
compGlyphSet = (
|
||
|
|
self.glyphSet
|
||
|
|
if comp.glyphName != self.name
|
||
|
|
else glyphSet.glyphSet
|
||
|
|
)
|
||
|
|
g = compGlyphSet[comp.glyphName]
|
||
|
|
if isPointPen:
|
||
|
|
tPen = TransformPointPen(pen, t)
|
||
|
|
g.drawPoints(tPen)
|
||
|
|
else:
|
||
|
|
tPen = TransformPen(pen, t)
|
||
|
|
g.draw(tPen)
|
||
|
|
|
||
|
|
def draw(self, pen):
|
||
|
|
self._draw(pen, False)
|
||
|
|
|
||
|
|
def drawPoints(self, pen):
|
||
|
|
self._draw(pen, True)
|
||
|
|
|
||
|
|
|
||
|
|
def _setCoordinates(glyph, coord, glyfTable, *, recalcBounds=True):
|
||
|
|
# Handle phantom points for (left, right, top, bottom) positions.
|
||
|
|
assert len(coord) >= 4
|
||
|
|
leftSideX = coord[-4][0]
|
||
|
|
rightSideX = coord[-3][0]
|
||
|
|
topSideY = coord[-2][1]
|
||
|
|
bottomSideY = coord[-1][1]
|
||
|
|
|
||
|
|
for _ in range(4):
|
||
|
|
del coord[-1]
|
||
|
|
|
||
|
|
if glyph.isComposite():
|
||
|
|
assert len(coord) == len(glyph.components)
|
||
|
|
glyph.components = [copy(comp) for comp in glyph.components] # Shallow copy
|
||
|
|
for p, comp in zip(coord, glyph.components):
|
||
|
|
if hasattr(comp, "x"):
|
||
|
|
comp.x, comp.y = p
|
||
|
|
elif glyph.numberOfContours == 0:
|
||
|
|
assert len(coord) == 0
|
||
|
|
else:
|
||
|
|
assert len(coord) == len(glyph.coordinates)
|
||
|
|
glyph.coordinates = coord
|
||
|
|
|
||
|
|
if recalcBounds:
|
||
|
|
glyph.recalcBounds(glyfTable)
|
||
|
|
|
||
|
|
horizontalAdvanceWidth = otRound(rightSideX - leftSideX)
|
||
|
|
verticalAdvanceWidth = otRound(topSideY - bottomSideY)
|
||
|
|
leftSideBearing = otRound(glyph.xMin - leftSideX)
|
||
|
|
topSideBearing = otRound(topSideY - glyph.yMax)
|
||
|
|
return (
|
||
|
|
horizontalAdvanceWidth,
|
||
|
|
leftSideBearing,
|
||
|
|
verticalAdvanceWidth,
|
||
|
|
topSideBearing,
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
class LerpGlyphSet(Mapping):
|
||
|
|
"""A glyphset that interpolates between two other glyphsets.
|
||
|
|
|
||
|
|
Factor is typically between 0 and 1. 0 means the first glyphset,
|
||
|
|
1 means the second glyphset, and 0.5 means the average of the
|
||
|
|
two glyphsets. Other values are possible, and can be useful to
|
||
|
|
extrapolate. Defaults to 0.5.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, glyphset1, glyphset2, factor=0.5):
|
||
|
|
self.glyphset1 = glyphset1
|
||
|
|
self.glyphset2 = glyphset2
|
||
|
|
self.factor = factor
|
||
|
|
|
||
|
|
def __getitem__(self, glyphname):
|
||
|
|
if glyphname in self.glyphset1 and glyphname in self.glyphset2:
|
||
|
|
return LerpGlyph(glyphname, self)
|
||
|
|
raise KeyError(glyphname)
|
||
|
|
|
||
|
|
def __contains__(self, glyphname):
|
||
|
|
return glyphname in self.glyphset1 and glyphname in self.glyphset2
|
||
|
|
|
||
|
|
def __iter__(self):
|
||
|
|
set1 = set(self.glyphset1)
|
||
|
|
set2 = set(self.glyphset2)
|
||
|
|
return iter(set1.intersection(set2))
|
||
|
|
|
||
|
|
def __len__(self):
|
||
|
|
set1 = set(self.glyphset1)
|
||
|
|
set2 = set(self.glyphset2)
|
||
|
|
return len(set1.intersection(set2))
|
||
|
|
|
||
|
|
|
||
|
|
class LerpGlyph:
|
||
|
|
def __init__(self, glyphname, glyphset):
|
||
|
|
self.glyphset = glyphset
|
||
|
|
self.glyphname = glyphname
|
||
|
|
|
||
|
|
def draw(self, pen):
|
||
|
|
recording1 = DecomposingRecordingPen(self.glyphset.glyphset1)
|
||
|
|
self.glyphset.glyphset1[self.glyphname].draw(recording1)
|
||
|
|
recording2 = DecomposingRecordingPen(self.glyphset.glyphset2)
|
||
|
|
self.glyphset.glyphset2[self.glyphname].draw(recording2)
|
||
|
|
|
||
|
|
factor = self.glyphset.factor
|
||
|
|
|
||
|
|
replayRecording(lerpRecordings(recording1.value, recording2.value, factor), pen)
|