Re: drawing a png, honoring transparency

[Carl Nygard <cjnygard fast net>]

On Wed, 2005-02-09 at 15:38 +0100, Akos Maroy wrote:
> Carl Nygard wrote:
> > Gdk::Pixbuf::render_to_drawable_alpha(...) has a parameter that lets you
> > set the threshold for the alpha.  Basically your only option is on/off,
> > no alpha blending-ish rendering is supported ATM.
> > 
> > Basically render_to_drawable_alpha uses the threshold and the alpha
> > channel to create the GC clipping mask, then renders using that, I
> > believe.
> 
> this call just doesn't seem to work. also, the documentation says that 
> the alpha related values are simply ignored:
> 
> 
> http://www.gtkmm.org/docs/gtkmm-2.4/docs/reference/html/classGdk_1_1Pixbuf.html#a29
> 
> 
> 	alpha_mode 	Ignored. Present for backwards compatibility.
> 	alpha_threshold 	Ignored. Present for backwards compatibility.
> 
> 
> and that the function itself is deprecated:
> 
> 
> Deprecated: This function is obsolete. Use gdk_draw_pixbuf() instead.

Yeah, that's 2.4.  My code (which Works For Me) uses the older gtkmm
libs.

Regards,
Carl