File format for katai (katai.io)

magic_and_mayhem_spr.ksy

meta:
  id: magic_and_mayhem_spr
  application: Magic & Mayhem
  file-extension: spr
  endian: le
seq:
  - id: header
    type: header
  - id: pallettes
    size: 256 * 3
    repeat: expr
    repeat-expr: header.num_pallettes
  - id: frames
    size-eos: true
    type: frames
types:
  header:
    seq:
      - id: magic
        contents: "SPR\0"
      - id: size
        type: s4
      - id: spr_type
        type: u4
        enum: spr_type
      - id: num_frames
        type: u4
      - id: num_pallettes
        type: u4
      - id: unknown_2
        type: u4
  frames:
    seq:
      - id: frame_offsets
        type: frame_entry
        repeat: expr
        repeat-expr: _root.header.num_frames
    instances:
      frame_offsets_size:
        value: 4 * _root.header.num_frames
  frame:
    seq:
      - id: size
        type: u4
      - id: width
        type: u4
      - id: height
        type: u4
      - id: center_x
        type: s4
      - id: center_y
        type: s4
      - id: name
        type: str
        encoding: ascii
        size: 8
      - id: pallette_id
        type: u4
      - id: unknown_1
        type: u4
      - id: unknown_2
        type: u4
      - id: pixels
        type: pixels
        size: size
  pixels:
    seq:
      - id: lines
        type: line
        repeat: expr
        repeat-expr: _parent.height
  line:
    seq:
      - id: offset_deltas
        type: u4
      - id: offset_pixels
        type: u4
    instances:
      deltas:
        size-eos: true
        pos: offset_deltas
      pixels:
        size-eos: true
        pos: offset_pixels
  frame_entry:
    seq:
      - id: offset
        type: u4
    instances:
      sprite:
        pos: offset + _parent.frame_offsets_size
        type: frame
enums:
  spr_type:
    0x4: standard # all creatures and tilesets
    0x2: special  # interf64.spr LOGO.spr magico64.spr magico80.spr
                  # overlay.spr scanner.spr Scrollbutt.spr