[pygtk] gtk.gdk.Pixbuf troubles and IRC

[Andrew]

On 20/07/10 23:20, Tim Evans wrote:
> On 2010-07-21 5:12, Andrew wrote:
> 
>>> #!/usr/bin/env python
>>> import gtk
>>> from gtk import gdk as gdk
>>>
>>> small = 16
>>> counter = 0
>>> offset = 4
>>> large = 24
>>>
>>> if __name__ == "__main__":
>>>
>>>      icon_theme = gtk.icon_theme_get_default();
>>>
>>>      small_pixbuf = icon_theme.load_icon("image", small, ());
>>>
>>>      large_pixbuf = icon_theme.load_icon("image", large, ());
>>>
>>>      large_pixbuf.fill(0x000000);
>>>
>>>      small_pixbuf_buffer = small_pixbuf.copy()
>>>      small_pixbuf.composite(large_pixbuf, 0, 0, 24, 24, 0, 0, 1, 1,
>>> gdk.INTERP_NEAREST, 255);
>>>      small_pixbuf_buffer = small_pixbuf.copy()
>>>      small_pixbuf.composite(large_pixbuf, 0, 0, 24, 24, 4, 4, 1, 1,
>>> gdk.INTERP_NEAREST, 255);
>>>      small_pixbuf_buffer = small_pixbuf.copy()
>>>      small_pixbuf.composite(large_pixbuf, 0, 0, 24, 24, 8, 8, 1, 1,
>>> gdk.INTERP_NEAREST, 255);
>>>
>>>      window = gtk.Window()
>>>      image = gtk.Image()
>>>      image.set_from_pixbuf(large_pixbuf)
>>>      window.add(image)
>>>      window.show_all()
>>>      window.connect("delete-event", gtk.main_quit)
>>>      gtk.main()
>>>
>>
>> Sorry to BUMP this guys but does anyone have any idea why this is
>> happening, your reply doesn't have to be a fix. Any bugs/documentation
>> you can point me to?
>>
> 
> Make doubly sure that both the large and small pixbufs have an alpha 
> channel.
> 
> Don't specify a destination rectangle larger than the scaled source 
> pixbuf. That seems to pull in random data rather than blank space.
> 
> The following seems to work for me:
> 
>    large = gtk.gdk.Pixbuf('rgb', True, 8, 30, 30)
>    large.fill(0)
>    small = widget.render_icon('gtk-ok', 'button') # 20-by-20
>    assert large.get_has_alpha()
>    assert small.get_has_alpha()
>    small.composite(large, 0, 0, 20, 20, 0, 0, 1, 1, 'nearest', 255)
>    small.composite(large, 5, 5, 20, 20, 5, 5, 1, 1, 'nearest', 255)
>    small.composite(large, 10, 10, 20, 20, 10, 10, 1, 1, 'nearest', 255)
>    large.save('test.png', 'png')
> 

Thanks for the reply.

That doesn't seem to work for me, it gives the image attached. I have
also tried this with other icon themes (GNOME, Tango) and the results
are still similiar.

Is this just a bug in GTK?

-- 
Andrew
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