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Diffstat (limited to 'Lib/fontTools/merge/__init__.py')
| -rw-r--r-- | Lib/fontTools/merge/__init__.py | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/Lib/fontTools/merge/__init__.py b/Lib/fontTools/merge/__init__.py new file mode 100644 index 00000000..152bf079 --- /dev/null +++ b/Lib/fontTools/merge/__init__.py @@ -0,0 +1,200 @@ +# 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 (e.g. ``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 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: + 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) + + +__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, ignore_unknown=['output-file']) + outfile = 'merged.ttf' + fontfiles = [] + for g in args: + if g.startswith('--output-file='): + outfile = g[14:] + continue + fontfiles.append(g) + + if len(args) < 1: + print("usage: pyftmerge font...", 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) + with timer("compile and save font"): + font.save(outfile) + + +if __name__ == "__main__": + sys.exit(main()) |