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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.