89 lines
3.1 KiB
Python
89 lines
3.1 KiB
Python
'''
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This script is part of the FURWARE texture creator, a texture
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generation script for the FURWARE text text-on-prim script
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for Second Life(R).
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Please see the included README and LICENSE files in the root
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directory for more information.
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'''
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'''
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This script loads a font file using the FreeType library
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for usage with (py)cairo. This is merely a workaround because
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the python binding to cairo currently doesn't support loading
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of fonts from a file. The function is based on the code from
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http://www.cairographics.org/freetypepython/
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'''
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import cairo
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import ctypes
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import ctypes.util
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_freetypeInitialized = False
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class PycairoContext(ctypes.Structure):
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_fields_ = [
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("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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]
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def fontFaceFromFile(filename):
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global _freetypeInitialized
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global _freetype_so
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global _cairo_so
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global _ft_lib
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global _surface
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CAIRO_STATUS_SUCCESS = 0
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FT_Err_Ok = 0
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if not _freetypeInitialized:
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# Find shared libraries.
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freetypeLibName = ctypes.util.find_library("freetype")
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if not freetypeLibName:
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raise Exception("FreeType library not found.")
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cairoLibName = ctypes.util.find_library("cairo")
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if not cairoLibName:
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raise Exception("Cairo library not found.")
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_freetype_so = ctypes.CDLL(freetypeLibName)
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_cairo_so = ctypes.CDLL(cairoLibName)
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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 _freetype_so.FT_Init_FreeType(ctypes.byref(_ft_lib)) != FT_Err_Ok:
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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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_freetypeInitialized = True
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# Create FreeType face.
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ftFace = 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 _freetype_so.FT_New_Face(_ft_lib, filename.encode("utf-8"), 0, ctypes.byref(ftFace)) != FT_Err_Ok:
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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(ftFace, 0)
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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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return face
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