magic_and_mayhem_spr.ksy

# based on https://github.com/saniv/sau/blob/master/src/fmt_spr.c
meta:
  id: magic_and_mayhem_sprite
  file-extension: spr
  application: Magic & Mayhem
  endian: le
seq:
  - id: magic
    contents: "SPR\0"
  - id: file_size
    type: s4
  - id: u1
    type: s4
  - id: num_frames
    type: s4
  - id: num_pallettes
    type: s4
  - id: u2
    type: s4
  - id: pallettes
    type: pallette
    repeat: expr
    repeat-expr: num_pallettes
  - id: frame_offsets
    type: u4le
    repeat: expr
    repeat-expr: num_frames
  - id: frames
    type: frames
    size-eos: true

types:
  pallette_color:
    seq:
      - id: r
        type: u1
      - id: g
        type: u1
      - id: b
        type: u1
  pallette:
    seq:
      - id: colors
        type: pallette_color
        repeat: expr
        repeat-expr: 256
  frames:
    seq:
      - id: frames
        type: frame(_index)
        repeat: expr
        repeat-expr: _root.num_frames
  frame:
    params:
      - id: idx
        type: u4
    instances:
      frame:
        pos: _root.frame_offsets[idx]
        type: frame_header
        size-eos: true
  frame_header:
    seq:
      - id: size
        type: u4
      - id: width
        type: u4
      - id: height
        type: u4
      - id: origin_x
        type: s4
      - id: origin_y
        type: s4
      - id: name
        type: str
        size: 8
        encoding: ascii
      - id: pallette_number
        type: u4
      - id: unknown1
        type: u4
      - id: unknown2
        type: u4
      - id: lines
        type: line
        repeat: expr
        repeat-expr: height
  line:
    seq:
      - id: deltas_offset
        type: u4
      - id: pixels_offset
        type: u4