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142 lines
3.4 KiB
Python
142 lines
3.4 KiB
Python
#
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# The Python Imaging Library.
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# $Id: FliImagePlugin.py 2134 2004-10-06 08:55:20Z fredrik $
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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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__version__ = "0.2"
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import Image, ImageFile, ImagePalette
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import string
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def i16(c):
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return ord(c[0]) + (ord(c[1])<<8)
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def i32(c):
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return ord(c[0]) + (ord(c[1])<<8) + (ord(c[2])<<16) + (ord(c[3])<<24)
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#
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# decoder
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def _accept(prefix):
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return i16(prefix[4:6]) in [0xAF11, 0xAF12]
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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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def _open(self):
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# HEAD
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s = self.fp.read(128)
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magic = i16(s[4:6])
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if magic not in [0xAF11, 0xAF12]:
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raise SyntaxError, "not an FLI/FLC file"
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# image characteristics
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self.mode = "P"
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self.size = i16(s[8:10]), i16(s[10:12])
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# animation speed
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duration = i32(s[16:20])
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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 = map(lambda a: (a,a,a), 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[4:6]) == 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[4:6]) == 0xF1FA:
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# look for palette chunk
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s = self.fp.read(6)
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if i16(s[4:6]) == 11:
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self._palette(palette, 2)
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elif i16(s[4:6]) == 4:
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self._palette(palette, 0)
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palette = map(lambda (r,g,b): chr(r)+chr(g)+chr(b), palette)
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self.palette = ImagePalette.raw("RGB", string.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.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 + ord(s[0])
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n = ord(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 = ord(s[n]) << shift
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g = ord(s[n+1]) << shift
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b = ord(s[n+2]) << shift
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palette[i] = (r, g, b)
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i = i + 1
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def seek(self, frame):
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if frame != self.frame + 1:
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raise ValueError, "cannot seek to frame %d" % frame
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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 = 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("FLI", FliImageFile, _accept)
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Image.register_extension("FLI", ".fli")
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Image.register_extension("FLI", ".flc")
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