lqr_progress_set_init — execude custom code before each rescaling operation
#include <lqr.h>
| LqrRetVal lqr_progress_set_init( | LqrProgress* p, | 
| LqrProgressFuncInit init_func ); | 
                        The function lqr_progress_set_init sets the hook
                        init_func to the LqrProgress object pointed to by
                        p.
                    
                        The function init_func is of type
                        LqrProgressFuncInit, whose prototype is defined by:
                        
typedef LqrRetVal (*LqrProgressFuncInit) (const gchar* init_message);
                        
                        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 first, with a string argument passed through the parameter
                        init_message, which is different for horizontal and vertical rescalings.
                    
                        The message arguments can be set with the functions
                        lqr_progress_set_init_width_message(3) and
                        lqr_progress_set_init_height_message(3).
                    
                        The default values for newly created LqrProgress objects are:
                        
                                        "Resizing width..."
                                    
                                        "Resizing height..."
                                    
                        LqrRetVal(3), lqr_progress_new(3), lqr_progress_set_update(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)