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Deprecated: This function is obsolete.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.
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