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