[cairo] Freetype to Cairo - newb needs help

[Behdad Esfahbod]

On Tue, 2007-10-23 at 16:48 +0200, Donn wrote:
> > The functions take FT_Library* and FT_Face* though.  You can wrap them
> > like both are simple ints.
> 
> I tried these:
> 
> >>> from ctypes import *
> >>> f=CDLL("libfreetype.so")
> >>> c=CDLL("libcairo.so")
> 
> >>> face=c_void_p()
> >>> lib=c_void_p()
> >>> f.FT_New_Face(lib,"F.TTF",0,face)
> 6

The 6 return value is an error.  Because you have not initialized lib
and/or that you are not passing face by reference.  Note that the C
prototype is FT_Face *, not FT_Face.

> >>> cairoface = c.cairo_ft_font_face_create_for_ft_face(face)
> Segmentation fault

Fixing those, it works:


from ctypes import *

f=CDLL("libfreetype.so")

lib=c_void_p()
print f.FT_Init_FreeType (byref (lib))

face=c_void_p()
print f.FT_New_Face (lib,
"/usr/share/fonts/dejavu-lgc/DejaVuLGCSans.ttf", 0, byref(face))

c=CDLL("libcairo.so")
cairoface = c.cairo_ft_font_face_create_for_ft_face (face)
print cairoface


However, I'm not sure how I can trick pygtk into creating a
cairo.FontFace object out of the int/pointer cairoface that I've got.

behdad

> Tried again:
> >>> face=c_int()
> >>> lib=c_int()
> 
> >>> f.FT_New_Face(lib,"F.TTF",0,face)
> 6
> 
> >>> cairoface = c.cairo_ft_font_face_create_for_ft_face(face)
> Segmentation fault
> 
> 
> What's the better procedure?
> /d
-- 
behdad
http://behdad.org/

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