Gtk.Image.prototype.set_pixel_size

function set_pixel_size(pixel_size:Number):void {
    // Gjs wrapper for gtk_image_set_pixel_size()
}

Sets the pixel size to use for named icons. If the pixel size is set to a value != -1, it is used instead of the icon size set by Gtk.Image.prototype.set_from_icon_name.

Since 2.6