SAGA/Datafiles/SAGA RLE2

From ScummVM :: Wiki
Jump to navigation Jump to search
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

SAGA_RLE2 Compression Format

The SAGA_RLE2 compression format is used in Sprite List Resources.
The SAGA_RLE2 compression format uses a two-byte RLE marker:

Type Order Name Description
INT16 . bg_runcount Background runcount
INT16 . fg_runcount Foreground runcount

The "background" of Sprite List data is the value 0x00, and is transparent.

To decode an SAGA_RLE2 resource:

  1. Read in RLE marker
  2. Write 0x00 to output [bg_runcount] times. ( Skip for transparency )
  3. Write [fg_runcount] bytes from encoded stream to output. ( Skip bytes of 0x00 for transparency )
  4. Read in the next RLE marker
  5. Repeat until end of input stream

The end of the encoded stream appears to be a single 0x00 byte.