# Copyright 2013 Google, Inc. All Rights Reserved. # # Google Author(s): Behdad Esfahbod, Roozbeh Pournader from fontTools import ttLib import fontTools.merge.base from fontTools.merge.cmap import ( computeMegaGlyphOrder, computeMegaCmap, renameCFFCharStrings, ) from fontTools.merge.layout import layoutPreMerge, layoutPostMerge from fontTools.merge.options import Options import fontTools.merge.tables from fontTools.misc.loggingTools import Timer from functools import reduce import sys import logging log = logging.getLogger("fontTools.merge") timer = Timer(logger=logging.getLogger(__name__ + ".timer"), level=logging.INFO) class Merger(object): """Font merger. This class merges multiple files into a single OpenType font, taking into account complexities such as OpenType layout (``GSUB``/``GPOS``) tables and cross-font metrics (for example ``hhea.ascent`` is set to the maximum value across all the fonts). If multiple glyphs map to the same Unicode value, and the glyphs are considered sufficiently different (that is, they differ in any of paths, widths, or height), then subsequent glyphs are renamed and a lookup in the ``locl`` feature will be created to disambiguate them. For example, if the arguments are an Arabic font and a Latin font and both contain a set of parentheses, the Latin glyphs will be renamed to ``parenleft.1`` and ``parenright.1``, and a lookup will be inserted into the to ``locl`` feature (creating it if necessary) under the ``latn`` script to substitute ``parenleft`` with ``parenleft.1`` etc. Restrictions: - All fonts must have the same units per em. - If duplicate glyph disambiguation takes place as described above then the fonts must have a ``GSUB`` table. Attributes: options: Currently unused. """ def __init__(self, options=None): if not options: options = Options() self.options = options def _openFonts(self, fontfiles): fonts = [ttLib.TTFont(fontfile) for fontfile in fontfiles] for font, fontfile in zip(fonts, fontfiles): font._merger__fontfile = fontfile font._merger__name = font["name"].getDebugName(4) return fonts def merge(self, fontfiles): """Merges fonts together. Args: fontfiles: A list of file names to be merged Returns: A :class:`fontTools.ttLib.TTFont` object. Call the ``save`` method on this to write it out to an OTF file. """ # # Settle on a mega glyph order. # fonts = self._openFonts(fontfiles) glyphOrders = [list(font.getGlyphOrder()) for font in fonts] computeMegaGlyphOrder(self, glyphOrders) # Take first input file sfntVersion sfntVersion = fonts[0].sfntVersion # Reload fonts and set new glyph names on them. fonts = self._openFonts(fontfiles) for font, glyphOrder in zip(fonts, glyphOrders): font.setGlyphOrder(glyphOrder) if "CFF " in font: renameCFFCharStrings(self, glyphOrder, font["CFF "]) cmaps = [font["cmap"] for font in fonts] self.duplicateGlyphsPerFont = [{} for _ in fonts] computeMegaCmap(self, cmaps) mega = ttLib.TTFont(sfntVersion=sfntVersion) mega.setGlyphOrder(self.glyphOrder) for font in fonts: self._preMerge(font) self.fonts = fonts allTags = reduce(set.union, (list(font.keys()) for font in fonts), set()) allTags.remove("GlyphOrder") for tag in sorted(allTags): if tag in self.options.drop_tables: continue with timer("merge '%s'" % tag): tables = [font.get(tag, NotImplemented) for font in fonts] log.info("Merging '%s'.", tag) clazz = ttLib.getTableClass(tag) table = clazz(tag).merge(self, tables) # XXX Clean this up and use: table = mergeObjects(tables) if table is not NotImplemented and table is not False: mega[tag] = table log.info("Merged '%s'.", tag) else: log.info("Dropped '%s'.", tag) del self.duplicateGlyphsPerFont del self.fonts self._postMerge(mega) return mega def mergeObjects(self, returnTable, logic, tables): # Right now we don't use self at all. Will use in the future # for options and logging. allKeys = set.union( set(), *(vars(table).keys() for table in tables if table is not NotImplemented), ) for key in allKeys: log.info(" %s", key) try: mergeLogic = logic[key] except KeyError: try: mergeLogic = logic["*"] except KeyError: raise Exception( "Don't know how to merge key %s of class %s" % (key, returnTable.__class__.__name__) ) if mergeLogic is NotImplemented: continue value = mergeLogic(getattr(table, key, NotImplemented) for table in tables) if value is not NotImplemented: setattr(returnTable, key, value) return returnTable def _preMerge(self, font): layoutPreMerge(font) def _postMerge(self, font): layoutPostMerge(font) if "OS/2" in font: # https://github.com/fonttools/fonttools/issues/2538 # TODO: Add an option to disable this? font["OS/2"].recalcAvgCharWidth(font) __all__ = ["Options", "Merger", "main"] @timer("make one with everything (TOTAL TIME)") def main(args=None): """Merge multiple fonts into one""" from fontTools import configLogger if args is None: args = sys.argv[1:] options = Options() args = options.parse_opts(args) fontfiles = [] if options.input_file: with open(options.input_file) as inputfile: fontfiles = [ line.strip() for line in inputfile.readlines() if not line.lstrip().startswith("#") ] for g in args: fontfiles.append(g) if len(fontfiles) < 1: print( "usage: pyftmerge [font1 ... fontN] [--input-file=filelist.txt] [--output-file=merged.ttf] [--import-file=tables.ttx]", file=sys.stderr, ) print( " [--drop-tables=tags] [--verbose] [--timing]", file=sys.stderr, ) print("", file=sys.stderr) print(" font1 ... fontN Files to merge.", file=sys.stderr) print( " --input-file= Read files to merge from a text file, each path new line. # Comment lines allowed.", file=sys.stderr, ) print( " --output-file= Specify output file name (default: merged.ttf).", file=sys.stderr, ) print( " --import-file= TTX file to import after merging. This can be used to set metadata.", file=sys.stderr, ) print( " --drop-tables= Comma separated list of table tags to skip, case sensitive.", file=sys.stderr, ) print( " --verbose Output progress information.", file=sys.stderr, ) print(" --timing Output progress timing.", file=sys.stderr) return 1 configLogger(level=logging.INFO if options.verbose else logging.WARNING) if options.timing: timer.logger.setLevel(logging.DEBUG) else: timer.logger.disabled = True merger = Merger(options=options) font = merger.merge(fontfiles) if options.import_file: font.importXML(options.import_file) with timer("compile and save font"): font.save(options.output_file) if __name__ == "__main__": sys.exit(main())