Short: Sources of Pac.Pic. xfdmaster client Author: Kyzer/CSG , François Lionet Uploader: Kyzer/CSG Type: dev/src Requires: util/pack/xfdmaster.lha Architecture: m68k-amigaos This is the source code of XFD's Pac.Pic. slave, for the curious. Pac.Pic. is an Amiga picture compression module used in AMOS Basic. It was created by François Lionet. The code for this slave is based on the original source code for the picture compactor extension, which came bundled with AMOS 1.3 all those years ago. Pac.Pic. is simply an RLE compressor, that re-orders the screen before compression in a way which favours large vertical lumps of colour. It RLE-encodes the reordered screen without using a special marker code, but rather one bit for every byte on the screen to say if it's a repeat or not. This large list of bits is then itself RLE encoded, which brings down the size quite a lot. This XFD slave 'decrunches' the picture to the uncompressed IFF ILBM picture format.