[cairo] Text Antialiasing

[Tim Flink]

Thanks for the tip. I changed my code so that I use set_font_options() 
before rendering the text.

However, I still don't think that the output text is anti-aliased even 
though running get_antialias() on the font confirms that it has been set 
to cairo.ANTIALIAS_GRAY.

Is there something else that I am missing?

Thanks,

Tim

Behdad Esfahbod wrote:
> On Thu, 2007-02-22 at 20:37 -0500, Tim Flink wrote:
>   
>> fo.set_hint_style(5)
>> fo.set_antialias(cairo.ANTIALIAS_DEFAULT)
>> xbearing, ybearing, width, height, xadvance, yadvance =
>> cr.text_extents(text)
>>     
>
> You've got to do cr.set_font_options(fo) before measuring text.
>
>   

-------------- next part --------------
#! /usr/bin/env python
# -*- coding: shift-jis -*-

import cairo

surface = cairo.SVGSurface('cairoAliasing.svg', 137, 60)
cr = cairo.Context(surface)
fo = cairo.FontOptions()

#set antialiasing
fo.set_antialias(cairo.ANTIALIAS_GRAY)
cr.set_font_options(fo)

#test with japanese characters
#text = 'Œ³‹C‚È”n'.decode('shift-jis')
#cr.select_font_face('IPA Mona Gothic', cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_NORMAL)

#test with roman characters
text = 'penny'
cr.select_font_face('Arial', cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_NORMAL)

cr.set_font_size(24)

xbearing, ybearing, width, height, xadvance, yadvance = cr.text_extents(text)

text_x = ( 137/2 ) - ( width/2 )
text_y = ( 60/2 ) + ( height/2 )	

cr.move_to(text_x, text_y)
cr.set_source_rgb(0, 0, 0)

#get information about writing text
options = cr.get_font_options()
print "antialising: %d" % (options.get_antialias(),)

cr.show_text(text)

surface.write_to_png('cairoAliasing.png')
cr.show_page()
surface.finish()