a #GtkSettings object, used to determine which set of user preferences to used.
an icon size (#GtkIconSize)
location to store icon width
location to store icon height
%TRUE if @size was a valid size
Deprecated: Use gtk_icon_size_lookup() instead.
2.2
Obtains the pixel size of a semantic icon size, possibly modified by user preferences for a particular #GtkSettings. Normally @size would be #GTK_ICON_SIZE_MENU, #GTK_ICON_SIZE_BUTTON, etc. This function isn’t normally needed, gtk_widget_render_icon_pixbuf() is the usual way to get an icon for rendering, then just look at the size of the rendered pixbuf. The rendered pixbuf may not even correspond to the width/height returned by gtk_icon_size_lookup(), because themes are free to render the pixbuf however they like, including changing the usual size.