[cairo] Freetype to Cairo - newb needs help

[Behdad Esfahbod]

Ok, thanks to Bertram's help off list, it's all fixed and cleaned now:

  http://cairographics.org/freetypepython

behdad


On Tue, 2007-10-23 at 20:52 -0400, Behdad Esfahbod wrote:
> On Tue, 2007-10-23 at 14:48 -0400, Bertram Felgenhauer wrote:
> > Donn wrote:
> > > > Fixing those, it works:
> > > Ah, I see. A little dizzy, but glad it's getting further. Now the thing, as 
> > > you mentioned, is casting the returned pointer, cairo_font_face_t, to a 
> > > cairo.FontFace object ... I'm all out.
> > 
> > It's not exactly trivial. The code below works for me. I'm not sure how
> > brittle it is.
> 
> Thanks.  Got that working, and then did a simpler approach myself.  Put
> it here:
> 
>   http://cairographics.org/freetypepython/
> 
> Though now I see that you uploaded your own version.  Feel free to clean
> up the wiki (raise instead of assert, etc).
> 
> There is a bug left though.  When I run it, it randomly works, or draws
> nothing, or draws in vertical mode.  I'm fairly sure it's some kind of
> refcounting issue.  If I remove the function definition and "if
> __name__" block and put everything straight, it works all the time.  Any
> idea?
> 
> behdad
> 
> 
> > HTH,
> > 
> > Bertram
> > 
> > ########################################################################
> > import cairo
> > import ctypes
> > 
> > # find DLLs
> > cairo_dll    = ctypes.CDLL("libcairo.so")
> > freetype_dll = ctypes.CDLL("libfreetype.so")
> > # this makes pycairo's internals available.
> > pycairo_dll  = ctypes.PyDLL(cairo._cairo.__file__)
> > 
> > # specify some types
> > cairo_dll.cairo_ft_font_face_create_for_ft_face.restype = ctypes.c_void_p
> > pycairo_dll.PycairoFontFace_FromFontFace.restype = ctypes.py_object
> > 
> > # initialise freetype
> > ft_lib = ctypes.c_void_p()
> > freetype_dll.FT_Init_FreeType(ctypes.byref(ft_lib))
> > 
> > # load font
> > ft_face = ctypes.c_void_p()
> > freetype_dll.FT_New_Face(ft_lib, "F.TTF", 0, ctypes.byref(ft_face))
> > 
> > # create cairo font face
> > cr_face_raw = cairo_dll.cairo_ft_font_face_create_for_ft_face(ft_face, 0)
> > cairo_dll.cairo_font_face_reference(cr_face_raw)
> > 
> > # now wrap it properly using pycairo
> > cr_face = pycairo_dll.PycairoFontFace_FromFontFace(cr_face_raw)
> > 
> > # the rest is pretty easy
> > surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 128, 128)
> > 
> > ctx = cairo.Context(surface)
> > 
> > ctx.set_font_face(cr_face)
> > ctx.set_font_size(30)
> > ctx.move_to(0, 44)
> > ctx.show_text("Hello,")
> > 
> > ctx.move_to(30, 74)
> > ctx.show_text("world!")
> > 
> > del ctx
> > 
> > surface.write_to_png("hello.png")
> > _______________________________________________
> > cairo mailing list
> > cairo at cairographics.org
> > http://lists.cairographics.org/mailman/listinfo/cairo
-- 
behdad
http://behdad.org/

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