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1# 

2# The Python Imaging Library. 

3# $Id$ 

4# 

5# FLI/FLC file handling. 

6# 

7# History: 

8# 95-09-01 fl Created 

9# 97-01-03 fl Fixed parser, setup decoder tile 

10# 98-07-15 fl Renamed offset attribute to avoid name clash 

11# 

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

13# Copyright (c) Fredrik Lundh 1995-97. 

14# 

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

16# 

17 

18 

19from . import Image, ImageFile, ImagePalette 

20from ._binary import i16le as i16 

21from ._binary import i32le as i32 

22from ._binary import o8 

23 

24# 

25# decoder 

26 

27 

28def _accept(prefix): 

29 return ( 

30 len(prefix) >= 6 

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

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

33 ) 

34 

35 

36## 

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

38# method to load individual frames. 

39 

40 

41class FliImageFile(ImageFile.ImageFile): 

42 

43 format = "FLI" 

44 format_description = "Autodesk FLI/FLC Animation" 

45 _close_exclusive_fp_after_loading = False 

46 

47 def _open(self): 

48 

49 # HEAD 

50 s = self.fp.read(128) 

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

52 raise SyntaxError("not an FLI/FLC file") 

53 

54 # frames 

55 self.n_frames = i16(s, 6) 

56 self.is_animated = self.n_frames > 1 

57 

58 # image characteristics 

59 self.mode = "P" 

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

61 

62 # animation speed 

63 duration = i32(s, 16) 

64 magic = i16(s, 4) 

65 if magic == 0xAF11: 

66 duration = (duration * 1000) // 70 

67 self.info["duration"] = duration 

68 

69 # look for palette 

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

71 

72 s = self.fp.read(16) 

73 

74 self.__offset = 128 

75 

76 if i16(s, 4) == 0xF100: 

77 # prefix chunk; ignore it 

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

79 s = self.fp.read(16) 

80 

81 if i16(s, 4) == 0xF1FA: 

82 # look for palette chunk 

83 s = self.fp.read(6) 

84 if i16(s, 4) == 11: 

85 self._palette(palette, 2) 

86 elif i16(s, 4) == 4: 

87 self._palette(palette, 0) 

88 

89 palette = [o8(r) + o8(g) + o8(b) for (r, g, b) in palette] 

90 self.palette = ImagePalette.raw("RGB", b"".join(palette)) 

91 

92 # set things up to decode first frame 

93 self.__frame = -1 

94 self._fp = self.fp 

95 self.__rewind = self.fp.tell() 

96 self.seek(0) 

97 

98 def _palette(self, palette, shift): 

99 # load palette 

100 

101 i = 0 

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

103 s = self.fp.read(2) 

104 i = i + s[0] 

105 n = s[1] 

106 if n == 0: 

107 n = 256 

108 s = self.fp.read(n * 3) 

109 for n in range(0, len(s), 3): 

110 r = s[n] << shift 

111 g = s[n + 1] << shift 

112 b = s[n + 2] << shift 

113 palette[i] = (r, g, b) 

114 i += 1 

115 

116 def seek(self, frame): 

117 if not self._seek_check(frame): 

118 return 

119 if frame < self.__frame: 

120 self._seek(0) 

121 

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

123 self._seek(f) 

124 

125 def _seek(self, frame): 

126 if frame == 0: 

127 self.__frame = -1 

128 self._fp.seek(self.__rewind) 

129 self.__offset = 128 

130 else: 

131 # ensure that the previous frame was loaded 

132 self.load() 

133 

134 if frame != self.__frame + 1: 

135 raise ValueError(f"cannot seek to frame {frame}") 

136 self.__frame = frame 

137 

138 # move to next frame 

139 self.fp = self._fp 

140 self.fp.seek(self.__offset) 

141 

142 s = self.fp.read(4) 

143 if not s: 

144 raise EOFError 

145 

146 framesize = i32(s) 

147 

148 self.decodermaxblock = framesize 

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

150 

151 self.__offset += framesize 

152 

153 def tell(self): 

154 return self.__frame 

155 

156 

157# 

158# registry 

159 

160Image.register_open(FliImageFile.format, FliImageFile, _accept) 

161 

162Image.register_extensions(FliImageFile.format, [".fli", ".flc"])