Gets a GdkGC with the given depth, colormap and GdkGCValues. If a GdkGC with the given properties already exists then it is returned, otherwise a new GdkGC is created. The returned GdkGC should be released with gtk_gc_release() when it is no longer needed.
Releases a GdkGC allocated using gtk_gc_get().
Description These functions provide access to a shared pool of GdkGC objects. When a new GdkGC is needed, gtk_gc_get() is called with the required depth, colormap and GdkGCValues. If a GdkGC with the required properties already exists then that is returned. If not, a new GdkGC is created. When the GdkGC is no longer needed, gtk_gc_release() should be called.