MTN Schema Final

Struct(
    "signature" / Const(b"MT\xbe\xef"),
    "unknown_const_256" / Const(256, Int16ul) * "Probably part of the signature",
    "width" / Int16ul,
    "minimum_bytes_per_row" / Int16ul * "Likely used to aid resizing",
    "height" / Int16ul * "Seems to be decreased by 1 when using the standard builder. Bug?",
    "color_count" / Const(16, Int16ul),
    "palette_and_image_size" / Int16ul * "This seems to be unused - and it bugs out with larger images. You can easily exceed a short, even with the default generator",
    "sky_palette_index" / Int16ul * "This is the palette index referring to what the sky was",
    "unknowns_16" / Struct(
        "unknown_3" / Int16ul * "This doesn't seem to be used, and doesn't always vary between mtns",
        "unknown_4" / Int16ul * "This doesn't seem to be used, and doesn't always vary between mtns",
        "unknown_5" / Int16ul * "This doesn't seem to be used, and doesn't always vary between mtns",
    ),
    "palette" / Array(
        16,
        Struct(
            "R" / Int8ul,
            "G" / Int8ul,
            "B" / Int8ul,
        )
    ) * "Identical to a standard bitmap palette, except for the order of the pixels",
    "pixels" / Array(
        this.width,
        FocusedSeq(
            "items",
            "count" / Rebuild(Int16ul, len_(this.items)),
            "items" / Bitwise(
                Aligned(
                    8,
                    Array(
                        this .count,
                        Nibble
                    )
                )
            ),
        )
    )
)