Method embedTTFType42

lib/matplotlib/backends/backend_pdf.py:1237–1330

The Type 42-specific part of embedding a Truetype font

(font, subset_index, charmap, descriptor)

            return fontdictObject

        def embedTTFType42(font, subset_index, charmap, descriptor):
            """The Type 42-specific part of embedding a Truetype font"""
            fontdescObject = self.reserveObject('font descriptor')
            cidFontDictObject = self.reserveObject('CID font dictionary')
            type0FontDictObject = self.reserveObject('Type 0 font dictionary')
            cidToGidMapObject = self.reserveObject('CIDToGIDMap stream')
            fontfileObject = self.reserveObject('font file stream')
            wObject = self.reserveObject('Type 0 widths')
            toUnicodeMapObject = self.reserveObject('ToUnicode map')

            _log.debug("SUBSET %r:%d characters: %s", filename, subset_index, charmap)
            with _backend_pdf_ps.get_glyphs_subset(filename,
                                                   charmap.values()) as subset:
                fontdata = _backend_pdf_ps.font_as_file(subset)
            _log.debug(
                "SUBSET %r:%d %d -> %d", filename, subset_index,
                os.stat(filename).st_size, fontdata.getbuffer().nbytes
            )

            # reload the font object from the subset
            # (all the necessary data could probably be obtained directly
            # using fontLib.ttLib)
            font = FT2Font(fontdata)

            cidFontDict = {
                'Type': Name('Font'),
                'Subtype': Name('CIDFontType2'),
                'BaseFont': ps_name,
                'CIDSystemInfo': {
                    'Registry': 'Adobe',
                    'Ordering': 'Identity',
                    'Supplement': 0},
                'FontDescriptor': fontdescObject,
                'W': wObject,
                'CIDToGIDMap': cidToGidMapObject
                }

            type0FontDict = {
                'Type': Name('Font'),
                'Subtype': Name('Type0'),
                'BaseFont': ps_name,
                'Encoding': Name('Identity-H'),
                'DescendantFonts': [cidFontDictObject],
                'ToUnicode': toUnicodeMapObject
                }

            # Make fontfile stream
            descriptor['FontFile2'] = fontfileObject
            self.outputStream(
                fontfileObject, fontdata.getvalue(),
                extra={'Length1': fontdata.getbuffer().nbytes})

            # Make the 'W' (Widths) array and CidToGidMap at the same time.
            cid_to_gid_map = ['\0'] * 65536
            widths = []
            max_ccode = 0
            for ccode, gind in charmap.items():
                glyph = font.load_glyph(gind,