174 lines
6.6 KiB
Python
174 lines
6.6 KiB
Python
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# Copyright 2013 Google, Inc. All Rights Reserved.
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#
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# Google Author(s): Behdad Esfahbod, Roozbeh Pournader
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from fontTools.merge.unicode import is_Default_Ignorable
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from fontTools.pens.recordingPen import DecomposingRecordingPen
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import logging
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log = logging.getLogger("fontTools.merge")
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def computeMegaGlyphOrder(merger, glyphOrders):
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"""Modifies passed-in glyphOrders to reflect new glyph names.
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Stores merger.glyphOrder."""
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megaOrder = {}
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for glyphOrder in glyphOrders:
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for i, glyphName in enumerate(glyphOrder):
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if glyphName in megaOrder:
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n = megaOrder[glyphName]
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while (glyphName + "." + repr(n)) in megaOrder:
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n += 1
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megaOrder[glyphName] = n
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glyphName += "." + repr(n)
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glyphOrder[i] = glyphName
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megaOrder[glyphName] = 1
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merger.glyphOrder = megaOrder = list(megaOrder.keys())
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def _glyphsAreSame(
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glyphSet1,
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glyphSet2,
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glyph1,
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glyph2,
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advanceTolerance=0.05,
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advanceToleranceEmpty=0.20,
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):
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pen1 = DecomposingRecordingPen(glyphSet1)
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pen2 = DecomposingRecordingPen(glyphSet2)
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g1 = glyphSet1[glyph1]
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g2 = glyphSet2[glyph2]
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g1.draw(pen1)
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g2.draw(pen2)
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if pen1.value != pen2.value:
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return False
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# Allow more width tolerance for glyphs with no ink
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tolerance = advanceTolerance if pen1.value else advanceToleranceEmpty
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# TODO Warn if advances not the same but within tolerance.
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if abs(g1.width - g2.width) > g1.width * tolerance:
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return False
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if hasattr(g1, "height") and g1.height is not None:
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if abs(g1.height - g2.height) > g1.height * tolerance:
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return False
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return True
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def computeMegaUvs(merger, uvsTables):
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"""Returns merged UVS subtable (cmap format=14)."""
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uvsDict = {}
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cmap = merger.cmap
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for table in uvsTables:
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for variationSelector, uvsMapping in table.uvsDict.items():
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if variationSelector not in uvsDict:
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uvsDict[variationSelector] = {}
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for unicodeValue, glyphName in uvsMapping:
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if cmap.get(unicodeValue) == glyphName:
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# this is a default variation
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glyphName = None
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# prefer previous glyph id if both fonts defined UVS
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if unicodeValue not in uvsDict[variationSelector]:
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uvsDict[variationSelector][unicodeValue] = glyphName
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for variationSelector in uvsDict:
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uvsDict[variationSelector] = [*uvsDict[variationSelector].items()]
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return uvsDict
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# Valid (format, platformID, platEncID) triplets for cmap subtables containing
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# Unicode BMP-only and Unicode Full Repertoire semantics.
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# Cf. OpenType spec for "Platform specific encodings":
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# https://docs.microsoft.com/en-us/typography/opentype/spec/name
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class _CmapUnicodePlatEncodings:
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BMP = {(4, 3, 1), (4, 0, 3), (4, 0, 4), (4, 0, 6)}
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FullRepertoire = {(12, 3, 10), (12, 0, 4), (12, 0, 6)}
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UVS = {(14, 0, 5)}
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def computeMegaCmap(merger, cmapTables):
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"""Sets merger.cmap and merger.uvsDict."""
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# TODO Handle format=14.
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# Only merge format 4 and 12 Unicode subtables, ignores all other subtables
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# If there is a format 12 table for a font, ignore the format 4 table of it
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chosenCmapTables = []
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chosenUvsTables = []
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for fontIdx, table in enumerate(cmapTables):
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format4 = None
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format12 = None
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format14 = None
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for subtable in table.tables:
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properties = (subtable.format, subtable.platformID, subtable.platEncID)
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if properties in _CmapUnicodePlatEncodings.BMP:
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format4 = subtable
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elif properties in _CmapUnicodePlatEncodings.FullRepertoire:
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format12 = subtable
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elif properties in _CmapUnicodePlatEncodings.UVS:
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format14 = subtable
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else:
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log.warning(
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"Dropped cmap subtable from font '%s':\t"
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"format %2s, platformID %2s, platEncID %2s",
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fontIdx,
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subtable.format,
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subtable.platformID,
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subtable.platEncID,
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)
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if format12 is not None:
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chosenCmapTables.append((format12, fontIdx))
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elif format4 is not None:
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chosenCmapTables.append((format4, fontIdx))
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if format14 is not None:
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chosenUvsTables.append(format14)
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# Build the unicode mapping
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merger.cmap = cmap = {}
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fontIndexForGlyph = {}
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glyphSets = [None for f in merger.fonts] if hasattr(merger, "fonts") else None
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for table, fontIdx in chosenCmapTables:
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# handle duplicates
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for uni, gid in table.cmap.items():
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oldgid = cmap.get(uni, None)
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if oldgid is None:
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cmap[uni] = gid
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fontIndexForGlyph[gid] = fontIdx
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elif is_Default_Ignorable(uni) or uni in (0x25CC,): # U+25CC DOTTED CIRCLE
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continue
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elif oldgid != gid:
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# Char previously mapped to oldgid, now to gid.
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# Record, to fix up in GSUB 'locl' later.
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if merger.duplicateGlyphsPerFont[fontIdx].get(oldgid) is None:
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if glyphSets is not None:
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oldFontIdx = fontIndexForGlyph[oldgid]
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for idx in (fontIdx, oldFontIdx):
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if glyphSets[idx] is None:
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glyphSets[idx] = merger.fonts[idx].getGlyphSet()
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# if _glyphsAreSame(glyphSets[oldFontIdx], glyphSets[fontIdx], oldgid, gid):
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# continue
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merger.duplicateGlyphsPerFont[fontIdx][oldgid] = gid
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elif merger.duplicateGlyphsPerFont[fontIdx][oldgid] != gid:
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# Char previously mapped to oldgid but oldgid is already remapped to a different
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# gid, because of another Unicode character.
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# TODO: Try harder to do something about these.
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log.warning(
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"Dropped mapping from codepoint %#06X to glyphId '%s'", uni, gid
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)
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merger.uvsDict = computeMegaUvs(merger, chosenUvsTables)
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def renameCFFCharStrings(merger, glyphOrder, cffTable):
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"""Rename topDictIndex charStrings based on glyphOrder."""
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td = cffTable.cff.topDictIndex[0]
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charStrings = {}
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for i, v in enumerate(td.CharStrings.charStrings.values()):
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glyphName = glyphOrder[i]
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charStrings[glyphName] = v
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td.CharStrings.charStrings = charStrings
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td.charset = list(glyphOrder)
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