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