lqr_progress_set_update — execude custom code at regular steps during each rescaling operation
#include <lqr.h>
| LqrRetVal lqr_progress_set_update( | LqrProgress* p, | 
| LqrProgressFuncUpdate update_func ); | 
                        The function lqr_progress_set_update sets the hook
                        update_func to the LqrProgress object pointed to by
                        p.
                    
                        The function update_func is of type
                        LqrProgressFuncUpdate, whose prototype is defined by:
                        
typedef LqrRetVal (*LqrProgressFuncUpdate) (gdouble completion_percentage);
                        
                        Each time that the function lqr_carver_resize(3) performs a rescale
                        operation (recall that it can perform more than one rescale operation at each call) this
                        function will be called at regular intervale, with the current completion percentage
                        completion_percentage as an argument.
                    
                        The update step can be set with the function
                        lqr_progress_set_update_step(3).
                    
                        LqrRetVal(3), lqr_progress_new(3), lqr_progress_set_init(3), lqr_progress_set_end(3), lqr_progress_set_init_width_message(3), lqr_progress_set_init_height_message(3), lqr_progress_set_end_width_message(3), lqr_progress_set_end_height_message(3), lqr_progress_set_update_step(3), lqr_carver_set_progress(3)