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249 lines
8.1 KiB
Python
249 lines
8.1 KiB
Python
# 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 import ttLib
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import fontTools.merge.base
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from fontTools.merge.cmap import (
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computeMegaGlyphOrder,
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computeMegaCmap,
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renameCFFCharStrings,
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)
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from fontTools.merge.layout import layoutPreMerge, layoutPostMerge
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from fontTools.merge.options import Options
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import fontTools.merge.tables
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from fontTools.misc.loggingTools import Timer
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from functools import reduce
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import sys
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import logging
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log = logging.getLogger("fontTools.merge")
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timer = Timer(logger=logging.getLogger(__name__ + ".timer"), level=logging.INFO)
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class Merger(object):
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"""Font merger.
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This class merges multiple files into a single OpenType font, taking into
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account complexities such as OpenType layout (``GSUB``/``GPOS``) tables and
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cross-font metrics (for example ``hhea.ascent`` is set to the maximum value
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across all the fonts).
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If multiple glyphs map to the same Unicode value, and the glyphs are considered
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sufficiently different (that is, they differ in any of paths, widths, or
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height), then subsequent glyphs are renamed and a lookup in the ``locl``
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feature will be created to disambiguate them. For example, if the arguments
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are an Arabic font and a Latin font and both contain a set of parentheses,
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the Latin glyphs will be renamed to ``parenleft.1`` and ``parenright.1``,
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and a lookup will be inserted into the to ``locl`` feature (creating it if
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necessary) under the ``latn`` script to substitute ``parenleft`` with
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``parenleft.1`` etc.
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Restrictions:
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- All fonts must have the same units per em.
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- If duplicate glyph disambiguation takes place as described above then the
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fonts must have a ``GSUB`` table.
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Attributes:
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options: Currently unused.
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"""
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def __init__(self, options=None):
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if not options:
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options = Options()
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self.options = options
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def _openFonts(self, fontfiles):
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fonts = [ttLib.TTFont(fontfile) for fontfile in fontfiles]
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for font, fontfile in zip(fonts, fontfiles):
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font._merger__fontfile = fontfile
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font._merger__name = font["name"].getDebugName(4)
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return fonts
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def merge(self, fontfiles):
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"""Merges fonts together.
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Args:
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fontfiles: A list of file names to be merged
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Returns:
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A :class:`fontTools.ttLib.TTFont` object. Call the ``save`` method on
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this to write it out to an OTF file.
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"""
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#
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# Settle on a mega glyph order.
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#
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fonts = self._openFonts(fontfiles)
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glyphOrders = [list(font.getGlyphOrder()) for font in fonts]
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computeMegaGlyphOrder(self, glyphOrders)
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# Take first input file sfntVersion
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sfntVersion = fonts[0].sfntVersion
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# Reload fonts and set new glyph names on them.
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fonts = self._openFonts(fontfiles)
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for font, glyphOrder in zip(fonts, glyphOrders):
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font.setGlyphOrder(glyphOrder)
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if "CFF " in font:
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renameCFFCharStrings(self, glyphOrder, font["CFF "])
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cmaps = [font["cmap"] for font in fonts]
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self.duplicateGlyphsPerFont = [{} for _ in fonts]
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computeMegaCmap(self, cmaps)
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mega = ttLib.TTFont(sfntVersion=sfntVersion)
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mega.setGlyphOrder(self.glyphOrder)
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for font in fonts:
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self._preMerge(font)
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self.fonts = fonts
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allTags = reduce(set.union, (list(font.keys()) for font in fonts), set())
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allTags.remove("GlyphOrder")
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for tag in sorted(allTags):
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if tag in self.options.drop_tables:
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continue
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with timer("merge '%s'" % tag):
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tables = [font.get(tag, NotImplemented) for font in fonts]
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log.info("Merging '%s'.", tag)
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clazz = ttLib.getTableClass(tag)
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table = clazz(tag).merge(self, tables)
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# XXX Clean this up and use: table = mergeObjects(tables)
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if table is not NotImplemented and table is not False:
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mega[tag] = table
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log.info("Merged '%s'.", tag)
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else:
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log.info("Dropped '%s'.", tag)
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del self.duplicateGlyphsPerFont
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del self.fonts
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self._postMerge(mega)
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return mega
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def mergeObjects(self, returnTable, logic, tables):
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# Right now we don't use self at all. Will use in the future
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# for options and logging.
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allKeys = set.union(
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set(),
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*(vars(table).keys() for table in tables if table is not NotImplemented),
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)
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for key in allKeys:
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log.info(" %s", key)
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try:
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mergeLogic = logic[key]
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except KeyError:
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try:
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mergeLogic = logic["*"]
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except KeyError:
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raise Exception(
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"Don't know how to merge key %s of class %s"
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% (key, returnTable.__class__.__name__)
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)
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if mergeLogic is NotImplemented:
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continue
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value = mergeLogic(getattr(table, key, NotImplemented) for table in tables)
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if value is not NotImplemented:
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setattr(returnTable, key, value)
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return returnTable
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def _preMerge(self, font):
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layoutPreMerge(font)
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def _postMerge(self, font):
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layoutPostMerge(font)
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if "OS/2" in font:
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# https://github.com/fonttools/fonttools/issues/2538
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# TODO: Add an option to disable this?
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font["OS/2"].recalcAvgCharWidth(font)
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__all__ = ["Options", "Merger", "main"]
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@timer("make one with everything (TOTAL TIME)")
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def main(args=None):
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"""Merge multiple fonts into one"""
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from fontTools import configLogger
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if args is None:
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args = sys.argv[1:]
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options = Options()
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args = options.parse_opts(args)
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fontfiles = []
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if options.input_file:
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with open(options.input_file) as inputfile:
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fontfiles = [
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line.strip()
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for line in inputfile.readlines()
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if not line.lstrip().startswith("#")
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]
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for g in args:
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fontfiles.append(g)
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if len(fontfiles) < 1:
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print(
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"usage: fonttools merge [font1 ... fontN] [--input-file=filelist.txt] [--output-file=merged.ttf] [--import-file=tables.ttx]",
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file=sys.stderr,
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)
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print(
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" [--drop-tables=tags] [--verbose] [--timing]",
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file=sys.stderr,
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)
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print("", file=sys.stderr)
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print(" font1 ... fontN Files to merge.", file=sys.stderr)
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print(
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" --input-file=<filename> Read files to merge from a text file, each path new line. # Comment lines allowed.",
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file=sys.stderr,
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)
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print(
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" --output-file=<filename> Specify output file name (default: merged.ttf).",
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file=sys.stderr,
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)
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print(
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" --import-file=<filename> TTX file to import after merging. This can be used to set metadata.",
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file=sys.stderr,
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)
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print(
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" --drop-tables=<table tags> Comma separated list of table tags to skip, case sensitive.",
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file=sys.stderr,
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)
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print(
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" --verbose Output progress information.",
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file=sys.stderr,
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)
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print(" --timing Output progress timing.", file=sys.stderr)
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return 1
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configLogger(level=logging.INFO if options.verbose else logging.WARNING)
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if options.timing:
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timer.logger.setLevel(logging.DEBUG)
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else:
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timer.logger.disabled = True
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merger = Merger(options=options)
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font = merger.merge(fontfiles)
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if options.import_file:
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font.importXML(options.import_file)
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with timer("compile and save font"):
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font.save(options.output_file)
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if __name__ == "__main__":
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sys.exit(main())
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