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#

# The Python Imaging Library.

# $Id$

#

# FLI/FLC file handling.

#

# History:

# 95-09-01 fl Created

# 97-01-03 fl Fixed parser, setup decoder tile

# 98-07-15 fl Renamed offset attribute to avoid name clash

#

# Copyright (c) Secret Labs AB 1997-98.

# Copyright (c) Fredrik Lundh 1995-97.

#

# See the README file for information on usage and redistribution.

#

from __future__ import annotations

import os

from . import Image, ImageFile, ImagePalette

from ._binary import i16le as i16

from ._binary import i32le as i32

from ._binary import o8

#

# decoder

def _accept(prefix: bytes) -> bool:

return (

len(prefix) >= 6

and i16(prefix, 4) in [0xAF11, 0xAF12]

and i16(prefix, 14) in [0, 3] # flags

)

##

# Image plugin for the FLI/FLC animation format. Use the <b>seek</b>

# method to load individual frames.

class FliImageFile(ImageFile.ImageFile):

format = "FLI"

format_description = "Autodesk FLI/FLC Animation"

_close_exclusive_fp_after_loading = False

def _open(self) -> None:

# HEAD

s = self.fp.read(128)

if not (_accept(s) and s[20:22] == b"\x00\x00"):

msg = "not an FLI/FLC file"

raise SyntaxError(msg)

# frames

self.n_frames = i16(s, 6)

self.is_animated = self.n_frames > 1

# image characteristics

self._mode = "P"

self._size = i16(s, 8), i16(s, 10)

# animation speed

duration = i32(s, 16)

magic = i16(s, 4)

if magic == 0xAF11:

duration = (duration * 1000) // 70

self.info["duration"] = duration

# look for palette

palette = [(a, a, a) for a in range(256)]

s = self.fp.read(16)

self.__offset = 128

if i16(s, 4) == 0xF100:

# prefix chunk; ignore it

self.__offset = self.__offset + i32(s)

self.fp.seek(self.__offset)

s = self.fp.read(16)

if i16(s, 4) == 0xF1FA:

# look for palette chunk

number_of_subchunks = i16(s, 6)

chunk_size: int | None = None

for _ in range(number_of_subchunks):

if chunk_size is not None:

self.fp.seek(chunk_size - 6, os.SEEK_CUR)

s = self.fp.read(6)

chunk_type = i16(s, 4)

if chunk_type in (4, 11):

self._palette(palette, 2 if chunk_type == 11 else 0)

break

chunk_size = i32(s)

if not chunk_size:

break

self.palette = ImagePalette.raw(

"RGB", b"".join(o8(r) + o8(g) + o8(b) for (r, g, b) in palette)

)

# set things up to decode first frame

self.__frame = -1

self._fp = self.fp

self.__rewind = self.fp.tell()

self.seek(0)

def _palette(self, palette: list[tuple[int, int, int]], shift: int) -> None:

# load palette

i = 0

for e in range(i16(self.fp.read(2))):

s = self.fp.read(2)

i = i + s[0]

n = s[1]

if n == 0:

n = 256

s = self.fp.read(n * 3)

for n in range(0, len(s), 3):

r = s[n] << shift

g = s[n + 1] << shift

b = s[n + 2] << shift

palette[i] = (r, g, b)

i += 1

def seek(self, frame: int) -> None:

if not self._seek_check(frame):

return

if frame < self.__frame:

self._seek(0)

for f in range(self.__frame + 1, frame + 1):

self._seek(f)

def _seek(self, frame: int) -> None:

if frame == 0:

self.__frame = -1

self._fp.seek(self.__rewind)

self.__offset = 128

else:

# ensure that the previous frame was loaded

self.load()

if frame != self.__frame + 1:

msg = f"cannot seek to frame {frame}"

raise ValueError(msg)

self.__frame = frame

# move to next frame

self.fp = self._fp

self.fp.seek(self.__offset)

s = self.fp.read(4)

if not s:

msg = "missing frame size"

raise EOFError(msg)

framesize = i32(s)

self.decodermaxblock = framesize

self.tile = [ImageFile._Tile("fli", (0, 0) + self.size, self.__offset)]

self.__offset += framesize

def tell(self) -> int:

return self.__frame

#

# registry

Image.register_open(FliImageFile.format, FliImageFile, _accept)

Image.register_extensions(FliImageFile.format, [".fli", ".flc"])