On 20 Aug 2006, at 09:16, gwicks wrote: > >> Like a PIC, but with a 14 byte header instead of 10 bytes. The extra >> long word is usually a zero before the $4AFC flag. > > > Just out of interest, why did TT think it necessary to have both > _psa and > _pic formats? Most of us had never heard of the former until George > Gwilt > released SVSCR, although both are documented in the QPTR manual. > > Officially the extra bytes are for the programmer's own use, but > has anyone > actually done this? In what circumstances would you make use of the > extra > bytes?
_psa and _pic files have only one mode, rather like a sprite. But sprites of other modes can be linked together, each sprite having a specific item for this purpose. Although it is not defined in the QPTR manual, it would be possible (and useful) to link together _psa, but not _pic, files of different modes using the first long word. I must try this! George _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
