def supports_text(self, text, has_non_printable_chars=True):
'''
Returns True if all the characters in text have glyphs in this font.
'''
if not isinstance(text, unicode):
raise TypeError('%r is not a unicode object'%text)
if has_non_printable_chars:
from calibre.utils.fonts.utils import get_printable_characters
text = get_printable_characters(text)
chars = tuple(frozenset(map(ord, text)))
return self.face.supports_text(chars)
def find_font_for_text(self,
text,
allowed_families={'serif', 'sans-serif'},
preferred_families=('serif', 'sans-serif',
'monospace', 'cursive',
'fantasy')):
'''
Find a font on the system capable of rendering the given text.
Returns a font family (as given by fonts_for_family()) that has a
"normal" font and that can render the supplied text. If no such font
exists, returns None.
:return: (family name, faces) or None, None
'''
from calibre.utils.fonts.utils import (supports_text,
panose_to_css_generic_family,
get_printable_characters)
if not isinstance(text, unicode_type):
raise TypeError(u'%r is not unicode' % text)
text = get_printable_characters(text)
found = {}
def filter_faces(font):
try:
raw = self.get_font_data(font)
return supports_text(raw, text)
except:
pass
return False
for family in self.find_font_families():
faces = list(filter(filter_faces, self.fonts_for_family(family)))
if not faces:
continue
generic_family = panose_to_css_generic_family(faces[0]['panose'])
if generic_family in allowed_families or generic_family == preferred_families[
0]:
return (family, faces)
elif generic_family not in found:
found[generic_family] = (family, faces)
for f in preferred_families:
if f in found:
return found[f]
return None, None
def find_font_for_text(
self,
text,
allowed_families={"serif", "sans-serif"},
preferred_families=("serif", "sans-serif", "monospace", "cursive", "fantasy"),
):
"""
Find a font on the system capable of rendering the given text.
Returns a font family (as given by fonts_for_family()) that has a
"normal" font and that can render the supplied text. If no such font
exists, returns None.
:return: (family name, faces) or None, None
"""
from calibre.utils.fonts.utils import supports_text, panose_to_css_generic_family, get_printable_characters
if not isinstance(text, unicode):
raise TypeError("%r is not unicode" % text)
text = get_printable_characters(text)
found = {}
def filter_faces(font):
try:
raw = self.get_font_data(font)
return supports_text(raw, text)
except:
pass
return False
for family in self.find_font_families():
faces = filter(filter_faces, self.fonts_for_family(family))
if not faces:
continue
generic_family = panose_to_css_generic_family(faces[0]["panose"])
if generic_family in allowed_families or generic_family == preferred_families[0]:
return (family, faces)
elif generic_family not in found:
found[generic_family] = (family, faces)
for f in preferred_families:
if f in found:
return found[f]
return None, None
