def __init__(self, sfnt):
for table in (b'head', b'hhea', b'hmtx', b'cmap', b'OS/2', b'post',
b'name'):
if table not in sfnt:
raise UnsupportedFont('This font has no %s table'%table)
self.sfnt = sfnt
self.head = self.sfnt[b'head']
hhea = self.sfnt[b'hhea']
hhea.read_data(self.sfnt[b'hmtx'])
self.ascent = hhea.ascender
self.descent = hhea.descender
self.bbox = (self.head.x_min, self.head.y_min, self.head.x_max,
self.head.y_max)
self._advance_widths = hhea.advance_widths
self.cmap = self.sfnt[b'cmap']
self.units_per_em = self.head.units_per_em
self.os2 = self.sfnt[b'OS/2']
self.os2.read_data()
self.post = self.sfnt[b'post']
self.post.read_data()
self.names = get_all_font_names(self.sfnt[b'name'].raw, raw_is_table=True)
self.is_otf = 'CFF ' in self.sfnt.tables
self._sig = hash(self.sfnt[b'name'].raw)
# Metrics for embedding in PDF
pdf_scale = self.pdf_scale = lambda x:int(round(x*1000./self.units_per_em))
self.pdf_ascent, self.pdf_descent = map(pdf_scale,
(self.os2.typo_ascender, self.os2.typo_descender))
self.pdf_bbox = tuple(map(pdf_scale, self.bbox))
self.pdf_capheight = pdf_scale(getattr(self.os2, 'cap_height',
self.os2.typo_ascender))
self.pdf_avg_width = pdf_scale(self.os2.average_char_width)
self.pdf_stemv = 50 + int((self.os2.weight_class / 65.0) ** 2)
def create_sfnt(self, text_item):
get_table = partial(self.qt_hack.get_sfnt_table, text_item)
try:
ans = Font(Sfnt(get_table))
except UnsupportedFont as e:
raise UnsupportedFont('The font %s is not a valid sfnt. Error: %s'%(
text_item.font().family(), e))
glyph_map = self.qt_hack.get_glyph_map(text_item)
gm = {}
for uc, glyph_id in enumerate(glyph_map):
if glyph_id not in gm:
gm[glyph_id] = unichr(uc)
ans.full_glyph_map = gm
return ans
def create_sfnt(self, text_item):
get_table = partial(self.qt_hack.get_sfnt_table, text_item)
try:
ans = Font(Sfnt(get_table))
except UnsupportedFont as e:
raise UnsupportedFont(
'The font %s is not a valid sfnt. Error: %s' %
(text_item.font().family(), e))
glyph_map = self.qt_hack.get_glyph_map(text_item)
gm = {}
ans.ignore_glyphs = set()
for uc, glyph_id in enumerate(glyph_map):
if glyph_id not in gm:
gm[glyph_id] = codepoint_to_chr(uc)
if uc in (0xad, 0x200b):
ans.ignore_glyphs.add(glyph_id)
ans.full_glyph_map = gm
return ans
