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172 lines
4.3 KiB
Python
172 lines
4.3 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# FLI/FLC file handling.
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#
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# History:
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# 95-09-01 fl Created
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# 97-01-03 fl Fixed parser, setup decoder tile
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# 98-07-15 fl Renamed offset attribute to avoid name clash
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#
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# Copyright (c) Secret Labs AB 1997-98.
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# Copyright (c) Fredrik Lundh 1995-97.
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#
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# See the README file for information on usage and redistribution.
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#
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import os
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from . import Image, ImageFile, ImagePalette
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from ._binary import i16le as i16
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from ._binary import i32le as i32
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from ._binary import o8
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#
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# decoder
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def _accept(prefix):
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return (
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len(prefix) >= 6
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and i16(prefix, 4) in [0xAF11, 0xAF12]
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and i16(prefix, 14) in [0, 3] # flags
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)
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##
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# Image plugin for the FLI/FLC animation format. Use the <b>seek</b>
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# method to load individual frames.
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class FliImageFile(ImageFile.ImageFile):
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format = "FLI"
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format_description = "Autodesk FLI/FLC Animation"
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_close_exclusive_fp_after_loading = False
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def _open(self):
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# HEAD
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s = self.fp.read(128)
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if not (_accept(s) and s[20:22] == b"\x00\x00"):
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msg = "not an FLI/FLC file"
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raise SyntaxError(msg)
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# frames
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self.n_frames = i16(s, 6)
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self.is_animated = self.n_frames > 1
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# image characteristics
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self.mode = "P"
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self._size = i16(s, 8), i16(s, 10)
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# animation speed
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duration = i32(s, 16)
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magic = i16(s, 4)
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if magic == 0xAF11:
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duration = (duration * 1000) // 70
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self.info["duration"] = duration
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# look for palette
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palette = [(a, a, a) for a in range(256)]
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s = self.fp.read(16)
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self.__offset = 128
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if i16(s, 4) == 0xF100:
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# prefix chunk; ignore it
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self.__offset = self.__offset + i32(s)
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s = self.fp.read(16)
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if i16(s, 4) == 0xF1FA:
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# look for palette chunk
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number_of_subchunks = i16(s, 6)
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chunk_size = None
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for _ in range(number_of_subchunks):
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if chunk_size is not None:
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self.fp.seek(chunk_size - 6, os.SEEK_CUR)
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s = self.fp.read(6)
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chunk_type = i16(s, 4)
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if chunk_type in (4, 11):
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self._palette(palette, 2 if chunk_type == 11 else 0)
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break
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chunk_size = i32(s)
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if not chunk_size:
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break
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palette = [o8(r) + o8(g) + o8(b) for (r, g, b) in palette]
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self.palette = ImagePalette.raw("RGB", b"".join(palette))
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# set things up to decode first frame
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self.__frame = -1
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self._fp = self.fp
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self.__rewind = self.fp.tell()
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self.seek(0)
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def _palette(self, palette, shift):
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# load palette
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i = 0
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for e in range(i16(self.fp.read(2))):
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s = self.fp.read(2)
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i = i + s[0]
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n = s[1]
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if n == 0:
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n = 256
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s = self.fp.read(n * 3)
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for n in range(0, len(s), 3):
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r = s[n] << shift
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g = s[n + 1] << shift
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b = s[n + 2] << shift
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palette[i] = (r, g, b)
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i += 1
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def seek(self, frame):
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if not self._seek_check(frame):
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return
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if frame < self.__frame:
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self._seek(0)
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for f in range(self.__frame + 1, frame + 1):
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self._seek(f)
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def _seek(self, frame):
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if frame == 0:
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self.__frame = -1
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self._fp.seek(self.__rewind)
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self.__offset = 128
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else:
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# ensure that the previous frame was loaded
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self.load()
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if frame != self.__frame + 1:
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msg = f"cannot seek to frame {frame}"
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raise ValueError(msg)
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self.__frame = frame
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# move to next frame
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self.fp = self._fp
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self.fp.seek(self.__offset)
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s = self.fp.read(4)
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if not s:
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raise EOFError
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framesize = i32(s)
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self.decodermaxblock = framesize
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self.tile = [("fli", (0, 0) + self.size, self.__offset, None)]
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self.__offset += framesize
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def tell(self):
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return self.__frame
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#
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# registry
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Image.register_open(FliImageFile.format, FliImageFile, _accept)
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Image.register_extensions(FliImageFile.format, [".fli", ".flc"])
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