gtk窗口背景临时待式（好用）

void
update_widget_bg(GtkWidget *widget, gchar *img_file)
{
        GtkStyle *style;
        GdkPixbuf *pixbuf;
        GdkPixmap *pixmap;

        gint width, height;
        
        pixbuf = gdk_pixbuf_new_from_file(img_file, NULL);

        width = gdk_pixbuf_get_width(pixbuf);
        height = gdk_pixbuf_get_height(pixbuf);

        pixmap = gdk_pixmap_new(NULL, width, height, 24);
        gdk_pixbuf_render_pixmap_and_mask(pixbuf, &pixmap, NULL, 0);

	style = gtk_style_copy(GTK_WIDGET (widget)->style);

	if (style->bg_pixmap[GTK_STATE_NORMAL])
		g_object_unref(style->bg_pixmap[GTK_STATE_NORMAL]);

	style->bg_pixmap[GTK_STATE_NORMAL] = g_object_ref(pixmap);
	style->bg_pixmap[GTK_STATE_ACTIVE] = g_object_ref(pixmap);
	style->bg_pixmap[GTK_STATE_PRELIGHT] = g_object_ref(pixmap);
	style->bg_pixmap[GTK_STATE_SELECTED] = g_object_ref(pixmap);
	style->bg_pixmap[GTK_STATE_INSENSITIVE] = g_object_ref(pixmap);

	gtk_widget_set_style(GTK_WIDGET (widget), style);
	g_object_unref(style);
}