OwlCyberSecurity - MANAGER

Edit File: FliImagePlugin.py

#
# 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 . import Image, ImageFile, ImagePalette
from ._binary import i8, i16le as i16, i32le as i32, o8

#
# decoder

def _accept(prefix):
    return len(prefix) >= 6 and i16(prefix[4:6]) in [0xAF11, 0xAF12]

##
# 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):

# HEAD
        s = self.fp.read(128)
        magic = i16(s[4:6])
        if not (
            magic in [0xAF11, 0xAF12]
            and i16(s[14:16]) in [0, 3]  # flags
            and s[20:22] == b"\x00\x00"  # reserved
        ):
            raise SyntaxError("not an FLI/FLC file")

# frames
        self.__framecount = i16(s[6:8])

# image characteristics
        self.mode = "P"
        self._size = i16(s[8:10]), i16(s[10:12])

# animation speed
        duration = i32(s[16:20])
        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[4:6]) == 0xF100:
            # prefix chunk; ignore it
            self.__offset = self.__offset + i32(s)
            s = self.fp.read(16)

if i16(s[4:6]) == 0xF1FA:
            # look for palette chunk
            s = self.fp.read(6)
            if i16(s[4:6]) == 11:
                self._palette(palette, 2)
            elif i16(s[4:6]) == 4:
                self._palette(palette, 0)

palette = [o8(r) + o8(g) + o8(b) for (r, g, b) in palette]
        self.palette = ImagePalette.raw("RGB", b"".join(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, shift):
        # load palette

i = 0
        for e in range(i16(self.fp.read(2))):
            s = self.fp.read(2)
            i = i + i8(s[0])
            n = i8(s[1])
            if n == 0:
                n = 256
            s = self.fp.read(n * 3)
            for n in range(0, len(s), 3):
                r = i8(s[n]) << shift
                g = i8(s[n + 1]) << shift
                b = i8(s[n + 2]) << shift
                palette[i] = (r, g, b)
                i += 1

@property
    def n_frames(self):
        return self.__framecount

@property
    def is_animated(self):
        return self.__framecount > 1

def seek(self, frame):
        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):
        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:
            raise ValueError("cannot seek to frame %d" % frame)
        self.__frame = frame

# move to next frame
        self.fp = self.__fp
        self.fp.seek(self.__offset)

s = self.fp.read(4)
        if not s:
            raise EOFError

framesize = i32(s)

self.decodermaxblock = framesize
        self.tile = [("fli", (0, 0) + self.size, self.__offset, None)]

self.__offset += framesize

def tell(self):
        return self.__frame

def _close__fp(self):
        try:
            if self.__fp != self.fp:
                self.__fp.close()
        except AttributeError:
            pass
        finally:
            self.__fp = None

#
# registry

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

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