forked from 0ad/0ad
67 lines
2.3 KiB
Python
67 lines
2.3 KiB
Python
# Adapted from http://cairographics.org/freetypepython/
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import ctypes
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import cairo
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import sys
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CAIRO_STATUS_SUCCESS = 0
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FT_Err_Ok = 0
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FT_LOAD_DEFAULT = 0x0
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FT_LOAD_NO_HINTING = 0x2
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FT_LOAD_FORCE_AUTOHINT = 0x20
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FT_LOAD_NO_AUTOHINT = 0x8000
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# find required libraries (platform specific)
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if sys.platform == "win32":
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ft_lib = "freetype6.dll"
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lc_lib = "libcairo-2.dll"
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else:
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ft_lib = "libfreetype.so.6"
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lc_lib = "libcairo.so.2"
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_freetype_so = ctypes.CDLL (ft_lib)
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_cairo_so = ctypes.CDLL (lc_lib)
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_cairo_so.cairo_ft_font_face_create_for_ft_face.restype = ctypes.c_void_p
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_cairo_so.cairo_ft_font_face_create_for_ft_face.argtypes = [ ctypes.c_void_p, ctypes.c_int ]
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_cairo_so.cairo_set_font_face.argtypes = [ ctypes.c_void_p, ctypes.c_void_p ]
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_cairo_so.cairo_font_face_status.argtypes = [ ctypes.c_void_p ]
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_cairo_so.cairo_status.argtypes = [ ctypes.c_void_p ]
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# initialize freetype
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_ft_lib = ctypes.c_void_p ()
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if FT_Err_Ok != _freetype_so.FT_Init_FreeType (ctypes.byref (_ft_lib)):
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raise Exception("Error initialising FreeType library.")
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_surface = cairo.ImageSurface (cairo.FORMAT_A8, 0, 0)
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class PycairoContext(ctypes.Structure):
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_fields_ = [("PyObject_HEAD", ctypes.c_byte * object.__basicsize__),
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("ctx", ctypes.c_void_p),
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("base", ctypes.c_void_p)]
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def create_cairo_font_face_for_file (filename, faceindex=0, loadoptions=0):
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# create freetype face
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ft_face = ctypes.c_void_p()
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cairo_ctx = cairo.Context (_surface)
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cairo_t = PycairoContext.from_address(id(cairo_ctx)).ctx
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if FT_Err_Ok != _freetype_so.FT_New_Face (_ft_lib, filename, faceindex, ctypes.byref(ft_face)):
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raise Exception("Error creating FreeType font face for " + filename)
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# create cairo font face for freetype face
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cr_face = _cairo_so.cairo_ft_font_face_create_for_ft_face (ft_face, loadoptions)
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if CAIRO_STATUS_SUCCESS != _cairo_so.cairo_font_face_status (cr_face):
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raise Exception("Error creating cairo font face for " + filename)
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_cairo_so.cairo_set_font_face (cairo_t, cr_face)
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if CAIRO_STATUS_SUCCESS != _cairo_so.cairo_status (cairo_t):
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raise Exception("Error creating cairo font face for " + filename)
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face = cairo_ctx.get_font_face ()
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indexes = lambda char: _freetype_so.FT_Get_Char_Index(ft_face, ord(char))
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return (face, indexes)
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