363 lines
9.5 KiB
Python
363 lines
9.5 KiB
Python
|
"""
|
||
|
|
Wrapper around the Linux FontConfig library. Used to find available fonts.
|
||
|
|
"""
|
||
|
|
|
||
|
|
from collections import OrderedDict
|
||
|
|
from ctypes import *
|
||
|
|
|
||
|
|
import pyglet.lib
|
||
|
|
from pyglet.util import asbytes, asstr
|
||
|
|
from pyglet.font.base import FontException
|
||
|
|
|
||
|
|
|
||
|
|
# fontconfig library definitions
|
||
|
|
|
||
|
|
(FcResultMatch,
|
||
|
|
FcResultNoMatch,
|
||
|
|
FcResultTypeMismatch,
|
||
|
|
FcResultNoId,
|
||
|
|
FcResultOutOfMemory) = range(5)
|
||
|
|
FcResult = c_int
|
||
|
|
|
||
|
|
FC_FAMILY = asbytes('family')
|
||
|
|
FC_SIZE = asbytes('size')
|
||
|
|
FC_SLANT = asbytes('slant')
|
||
|
|
FC_WEIGHT = asbytes('weight')
|
||
|
|
FC_FT_FACE = asbytes('ftface')
|
||
|
|
FC_FILE = asbytes('file')
|
||
|
|
|
||
|
|
FC_WEIGHT_REGULAR = 80
|
||
|
|
FC_WEIGHT_BOLD = 200
|
||
|
|
|
||
|
|
FC_SLANT_ROMAN = 0
|
||
|
|
FC_SLANT_ITALIC = 100
|
||
|
|
|
||
|
|
(FcTypeVoid,
|
||
|
|
FcTypeInteger,
|
||
|
|
FcTypeDouble,
|
||
|
|
FcTypeString,
|
||
|
|
FcTypeBool,
|
||
|
|
FcTypeMatrix,
|
||
|
|
FcTypeCharSet,
|
||
|
|
FcTypeFTFace,
|
||
|
|
FcTypeLangSet) = range(9)
|
||
|
|
FcType = c_int
|
||
|
|
|
||
|
|
(FcMatchPattern,
|
||
|
|
FcMatchFont) = range(2)
|
||
|
|
FcMatchKind = c_int
|
||
|
|
|
||
|
|
|
||
|
|
class _FcValueUnion(Union):
|
||
|
|
_fields_ = [
|
||
|
|
('s', c_char_p),
|
||
|
|
('i', c_int),
|
||
|
|
('b', c_int),
|
||
|
|
('d', c_double),
|
||
|
|
('m', c_void_p),
|
||
|
|
('c', c_void_p),
|
||
|
|
('f', c_void_p),
|
||
|
|
('p', c_void_p),
|
||
|
|
('l', c_void_p),
|
||
|
|
]
|
||
|
|
|
||
|
|
|
||
|
|
class FcValue(Structure):
|
||
|
|
_fields_ = [
|
||
|
|
('type', FcType),
|
||
|
|
('u', _FcValueUnion)
|
||
|
|
]
|
||
|
|
|
||
|
|
# End of library definitions
|
||
|
|
|
||
|
|
|
||
|
|
class FontConfig:
|
||
|
|
def __init__(self):
|
||
|
|
self._fontconfig = self._load_fontconfig_library()
|
||
|
|
self._search_cache = OrderedDict()
|
||
|
|
self._cache_size = 20
|
||
|
|
|
||
|
|
def dispose(self):
|
||
|
|
while len(self._search_cache) > 0:
|
||
|
|
self._search_cache.popitem().dispose()
|
||
|
|
|
||
|
|
self._fontconfig.FcFini()
|
||
|
|
self._fontconfig = None
|
||
|
|
|
||
|
|
def create_search_pattern(self):
|
||
|
|
return FontConfigSearchPattern(self._fontconfig)
|
||
|
|
|
||
|
|
def find_font(self, name, size=12, bold=False, italic=False):
|
||
|
|
result = self._get_from_search_cache(name, size, bold, italic)
|
||
|
|
if result:
|
||
|
|
return result
|
||
|
|
|
||
|
|
search_pattern = self.create_search_pattern()
|
||
|
|
search_pattern.name = name
|
||
|
|
search_pattern.size = size
|
||
|
|
search_pattern.bold = bold
|
||
|
|
search_pattern.italic = italic
|
||
|
|
|
||
|
|
result = search_pattern.match()
|
||
|
|
self._add_to_search_cache(search_pattern, result)
|
||
|
|
search_pattern.dispose()
|
||
|
|
return result
|
||
|
|
|
||
|
|
def have_font(self, name):
|
||
|
|
result = self.find_font(name)
|
||
|
|
if result:
|
||
|
|
# Check the name matches, fontconfig can return a default
|
||
|
|
if name and result.name and result.name.lower() != name.lower():
|
||
|
|
return False
|
||
|
|
return True
|
||
|
|
else:
|
||
|
|
return False
|
||
|
|
|
||
|
|
def char_index(self, ft_face, character):
|
||
|
|
return self._fontconfig.FcFreeTypeCharIndex(ft_face, ord(character))
|
||
|
|
|
||
|
|
def _add_to_search_cache(self, search_pattern, result_pattern):
|
||
|
|
self._search_cache[(search_pattern.name,
|
||
|
|
search_pattern.size,
|
||
|
|
search_pattern.bold,
|
||
|
|
search_pattern.italic)] = result_pattern
|
||
|
|
if len(self._search_cache) > self._cache_size:
|
||
|
|
self._search_cache.popitem(last=False)[1].dispose()
|
||
|
|
|
||
|
|
def _get_from_search_cache(self, name, size, bold, italic):
|
||
|
|
result = self._search_cache.get((name, size, bold, italic), None)
|
||
|
|
|
||
|
|
if result and result.is_valid:
|
||
|
|
return result
|
||
|
|
else:
|
||
|
|
return None
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _load_fontconfig_library():
|
||
|
|
fontconfig = pyglet.lib.load_library('fontconfig')
|
||
|
|
fontconfig.FcInit()
|
||
|
|
|
||
|
|
fontconfig.FcPatternBuild.restype = c_void_p
|
||
|
|
fontconfig.FcPatternCreate.restype = c_void_p
|
||
|
|
fontconfig.FcFontMatch.restype = c_void_p
|
||
|
|
fontconfig.FcFreeTypeCharIndex.restype = c_uint
|
||
|
|
|
||
|
|
fontconfig.FcPatternAddDouble.argtypes = [c_void_p, c_char_p, c_double]
|
||
|
|
fontconfig.FcPatternAddInteger.argtypes = [c_void_p, c_char_p, c_int]
|
||
|
|
fontconfig.FcPatternAddString.argtypes = [c_void_p, c_char_p, c_char_p]
|
||
|
|
fontconfig.FcConfigSubstitute.argtypes = [c_void_p, c_void_p, c_int]
|
||
|
|
fontconfig.FcDefaultSubstitute.argtypes = [c_void_p]
|
||
|
|
fontconfig.FcFontMatch.argtypes = [c_void_p, c_void_p, c_void_p]
|
||
|
|
fontconfig.FcPatternDestroy.argtypes = [c_void_p]
|
||
|
|
|
||
|
|
fontconfig.FcPatternGetFTFace.argtypes = [c_void_p, c_char_p, c_int, c_void_p]
|
||
|
|
fontconfig.FcPatternGet.argtypes = [c_void_p, c_char_p, c_int, c_void_p]
|
||
|
|
|
||
|
|
return fontconfig
|
||
|
|
|
||
|
|
|
||
|
|
class FontConfigPattern:
|
||
|
|
def __init__(self, fontconfig, pattern=None):
|
||
|
|
self._fontconfig = fontconfig
|
||
|
|
self._pattern = pattern
|
||
|
|
|
||
|
|
@property
|
||
|
|
def is_valid(self):
|
||
|
|
return self._fontconfig and self._pattern
|
||
|
|
|
||
|
|
def _create(self):
|
||
|
|
assert not self._pattern
|
||
|
|
assert self._fontconfig
|
||
|
|
self._pattern = self._fontconfig.FcPatternCreate()
|
||
|
|
|
||
|
|
def _destroy(self):
|
||
|
|
assert self._pattern
|
||
|
|
assert self._fontconfig
|
||
|
|
self._fontconfig.FcPatternDestroy(self._pattern)
|
||
|
|
self._pattern = None
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _bold_to_weight(bold):
|
||
|
|
return FC_WEIGHT_BOLD if bold else FC_WEIGHT_REGULAR
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _italic_to_slant(italic):
|
||
|
|
return FC_SLANT_ITALIC if italic else FC_SLANT_ROMAN
|
||
|
|
|
||
|
|
def _set_string(self, name, value):
|
||
|
|
assert self._pattern
|
||
|
|
assert name
|
||
|
|
assert self._fontconfig
|
||
|
|
|
||
|
|
if not value:
|
||
|
|
return
|
||
|
|
|
||
|
|
value = value.encode('utf8')
|
||
|
|
|
||
|
|
self._fontconfig.FcPatternAddString(self._pattern, name, asbytes(value))
|
||
|
|
|
||
|
|
def _set_double(self, name, value):
|
||
|
|
assert self._pattern
|
||
|
|
assert name
|
||
|
|
assert self._fontconfig
|
||
|
|
|
||
|
|
if not value:
|
||
|
|
return
|
||
|
|
|
||
|
|
self._fontconfig.FcPatternAddDouble(self._pattern, name, c_double(value))
|
||
|
|
|
||
|
|
def _set_integer(self, name, value):
|
||
|
|
assert self._pattern
|
||
|
|
assert name
|
||
|
|
assert self._fontconfig
|
||
|
|
|
||
|
|
if not value:
|
||
|
|
return
|
||
|
|
|
||
|
|
self._fontconfig.FcPatternAddInteger(self._pattern, name, c_int(value))
|
||
|
|
|
||
|
|
def _get_value(self, name):
|
||
|
|
assert self._pattern
|
||
|
|
assert name
|
||
|
|
assert self._fontconfig
|
||
|
|
|
||
|
|
value = FcValue()
|
||
|
|
result = self._fontconfig.FcPatternGet(self._pattern, name, 0, byref(value))
|
||
|
|
if _handle_fcresult(result):
|
||
|
|
return value
|
||
|
|
else:
|
||
|
|
return None
|
||
|
|
|
||
|
|
def _get_string(self, name):
|
||
|
|
value = self._get_value(name)
|
||
|
|
|
||
|
|
if value and value.type == FcTypeString:
|
||
|
|
return asstr(value.u.s)
|
||
|
|
else:
|
||
|
|
return None
|
||
|
|
|
||
|
|
def _get_face(self, name):
|
||
|
|
value = self._get_value(name)
|
||
|
|
|
||
|
|
if value and value.type == FcTypeFTFace:
|
||
|
|
return value.u.f
|
||
|
|
else:
|
||
|
|
return None
|
||
|
|
|
||
|
|
def _get_integer(self, name):
|
||
|
|
value = self._get_value(name)
|
||
|
|
|
||
|
|
if value and value.type == FcTypeInteger:
|
||
|
|
return value.u.i
|
||
|
|
else:
|
||
|
|
return None
|
||
|
|
|
||
|
|
def _get_double(self, name):
|
||
|
|
value = self._get_value(name)
|
||
|
|
|
||
|
|
if value and value.type == FcTypeDouble:
|
||
|
|
return value.u.d
|
||
|
|
else:
|
||
|
|
return None
|
||
|
|
|
||
|
|
|
||
|
|
class FontConfigSearchPattern(FontConfigPattern):
|
||
|
|
def __init__(self, fontconfig):
|
||
|
|
super(FontConfigSearchPattern, self).__init__(fontconfig)
|
||
|
|
|
||
|
|
self.name = None
|
||
|
|
self.bold = False
|
||
|
|
self.italic = False
|
||
|
|
self.size = None
|
||
|
|
|
||
|
|
def match(self):
|
||
|
|
self._prepare_search_pattern()
|
||
|
|
result_pattern = self._get_match()
|
||
|
|
|
||
|
|
if result_pattern:
|
||
|
|
return FontConfigSearchResult(self._fontconfig, result_pattern)
|
||
|
|
else:
|
||
|
|
return None
|
||
|
|
|
||
|
|
def _prepare_search_pattern(self):
|
||
|
|
self._create()
|
||
|
|
self._set_string(FC_FAMILY, self.name)
|
||
|
|
self._set_double(FC_SIZE, self.size)
|
||
|
|
self._set_integer(FC_WEIGHT, self._bold_to_weight(self.bold))
|
||
|
|
self._set_integer(FC_SLANT, self._italic_to_slant(self.italic))
|
||
|
|
|
||
|
|
self._substitute_defaults()
|
||
|
|
|
||
|
|
def _substitute_defaults(self):
|
||
|
|
assert self._pattern
|
||
|
|
assert self._fontconfig
|
||
|
|
|
||
|
|
self._fontconfig.FcConfigSubstitute(None, self._pattern, FcMatchPattern)
|
||
|
|
self._fontconfig.FcDefaultSubstitute(self._pattern)
|
||
|
|
|
||
|
|
def _get_match(self):
|
||
|
|
assert self._pattern
|
||
|
|
assert self._fontconfig
|
||
|
|
|
||
|
|
match_result = FcResult()
|
||
|
|
match_pattern = self._fontconfig.FcFontMatch(0, self._pattern, byref(match_result))
|
||
|
|
|
||
|
|
if _handle_fcresult(match_result.value):
|
||
|
|
return match_pattern
|
||
|
|
else:
|
||
|
|
return None
|
||
|
|
|
||
|
|
def dispose(self):
|
||
|
|
self._destroy()
|
||
|
|
|
||
|
|
|
||
|
|
class FontConfigSearchResult(FontConfigPattern):
|
||
|
|
def __init__(self, fontconfig, result_pattern):
|
||
|
|
super(FontConfigSearchResult, self).__init__(fontconfig, result_pattern)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def name(self):
|
||
|
|
return self._get_string(FC_FAMILY)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def size(self):
|
||
|
|
return self._get_double(FC_SIZE)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def bold(self):
|
||
|
|
return self._get_integer(FC_WEIGHT) == FC_WEIGHT_BOLD
|
||
|
|
|
||
|
|
@property
|
||
|
|
def italic(self):
|
||
|
|
return self._get_integer(FC_SLANT) == FC_SLANT_ITALIC
|
||
|
|
|
||
|
|
@property
|
||
|
|
def face(self):
|
||
|
|
return self._get_face(FC_FT_FACE)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def file(self):
|
||
|
|
return self._get_string(FC_FILE)
|
||
|
|
|
||
|
|
def dispose(self):
|
||
|
|
self._destroy()
|
||
|
|
|
||
|
|
|
||
|
|
def _handle_fcresult(result):
|
||
|
|
if result == FcResultMatch:
|
||
|
|
return True
|
||
|
|
elif result in (FcResultNoMatch, FcResultTypeMismatch, FcResultNoId):
|
||
|
|
return False
|
||
|
|
elif result == FcResultOutOfMemory:
|
||
|
|
raise FontException('FontConfig ran out of memory.')
|
||
|
|
|
||
|
|
|
||
|
|
_fontconfig_instance = None
|
||
|
|
|
||
|
|
|
||
|
|
def get_fontconfig():
|
||
|
|
global _fontconfig_instance
|
||
|
|
if not _fontconfig_instance:
|
||
|
|
_fontconfig_instance = FontConfig()
|
||
|
|
return _fontconfig_instance
|