| .TH IM_HISTORY 3 "22 April 1991" |
| .SH NAME |
| im_histlin, im_updatehist, im_history_get \- manage image history |
| .SH SYNOPSIS |
| .B #include <vips/vips.h> |
| |
| int im_histlin( IMAGE *im, const char *fmt, ... ); |
| .br |
| int im_updatehist( IMAGE *out, const char *name, int argc, char *argv[] ); |
| .br |
| const char *im_history_get( IMAGE *im ); |
| |
| .br |
| .SH DESCRIPTION |
| .B im_histlin(3) |
| formats its arguments as printf(3), appends " # time-and-date", and appends |
| the whole line of text to the image history. The string is typically the |
| command-line action that would be required to do whatever it is that you've |
| just done to the image. |
| |
| .B im_updatehist(3) |
| is given a standard argc/argv, formats them appropriately, and calls |
| im_histlin(3) for you. Note that the program name is passed separately. |
| |
| .B im_history_get(3) |
| returns the entire history of an image as a single C string, one action per |
| line. No need to free, but you mustn't modify either. |
| |
| .SH RETURN VALUE |
| The function returns 0 on success and -1 on error. |
| .SH SEE ALSO |
| im_cp_desc(3). |
| .SH COPYRIGHT |
| Imperial College, London, 2007. |
