GimpOperationDifferenceMode
GimpOperationDifferenceMode; struct GimpOperationDifferenceModeClass;
GObject +----GeglOperation +----GeglOperationComposer +----GeglOperationPointComposer +----GimpOperationPointLayerMode +----GimpOperationDifferenceMode
typedef struct _GimpOperationDifferenceMode GimpOperationDifferenceMode;
struct GimpOperationDifferenceModeClass { GimpOperationPointLayerModeClass parent_class; };