window icon resolution

[Michael Cronenworth <mike cchtml com>]

When I call gdk_pixbuf_new_from_file() to set a window icon, the 
resulting image in the Gnome Shell ALT+TAB switcher is fuzzy and clearly 
low-resolution.

The window icon is a 128x128 pixel 24-bit PNG file. When I have the file 
displayed in another viewer (eog) and ALT+TAB, the Gnome Shell image is 
smaller than the full image in eog, but clearly fuzzier and lower 
resolution.

Other applications such as Pidgin, Firefox, or Geany display clear, 
high-resolution icons.

What am I doing wrong that other applications are doing right? I checked 
the Geany source and saw it had inlined the GdkPixbuf image and loaded 
it that way. Why would that make a difference?

Thanks,
Michael