[cairo] Vertical text

[Olivier Jolet]

Hi,
I'm trying to draw a text vertically, but I always get a 90 degree
rotation of the whole text and not of each character. 
The method I tried to use is font matrix transformation to a PI/2
rotation.
What is incorrect in my sequence? How can I do to rotate each character?
 
 - cairo_matrix_init
 - cairo_matrix_rotate
 - cairo_matrix_scale                                        
 - cairo_set_font_matrix
 - cairo_move_to
 - cairo_show_text
 
 
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