Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/pillow-10.4.0-py3.8-linux-x86_64.egg/PIL/XVThumbImagePlugin.py: 50%

1# 

2# The Python Imaging Library. 

3# $Id$ 

4# 

5# XV Thumbnail file handler by Charles E. "Gene" Cash 

6# (gcash@magicnet.net) 

7# 

8# see xvcolor.c and xvbrowse.c in the sources to John Bradley's XV, 

9# available from ftp://ftp.cis.upenn.edu/pub/xv/ 

10# 

11# history: 

12# 98-08-15 cec created (b/w only) 

13# 98-12-09 cec added color palette 

14# 98-12-28 fl added to PIL (with only a few very minor modifications) 

15# 

16# To do: 

17# FIXME: make save work (this requires quantization support) 

18# 

19from __future__ import annotations 

20 

21from . import Image, ImageFile, ImagePalette 

22from ._binary import o8 

23 

24_MAGIC = b"P7 332" 

25 

26# standard color palette for thumbnails (RGB332) 

27PALETTE = b"" 

28for r in range(8): 

29 for g in range(8): 

30 for b in range(4): 

31 PALETTE = PALETTE + ( 

32 o8((r * 255) // 7) + o8((g * 255) // 7) + o8((b * 255) // 3) 

33 ) 

34 

35 

36def _accept(prefix: bytes) -> bool: 

37 return prefix[:6] == _MAGIC 

38 

39 

40## 

41# Image plugin for XV thumbnail images. 

42 

43 

44class XVThumbImageFile(ImageFile.ImageFile): 

45 format = "XVThumb" 

46 format_description = "XV thumbnail image" 

47 

48 def _open(self) -> None: 

49 # check magic 

50 assert self.fp is not None 

51 

52 if not _accept(self.fp.read(6)): 

53 msg = "not an XV thumbnail file" 

54 raise SyntaxError(msg) 

55 

56 # Skip to beginning of next line 

57 self.fp.readline() 

58 

59 # skip info comments 

60 while True: 

61 s = self.fp.readline() 

62 if not s: 

63 msg = "Unexpected EOF reading XV thumbnail file" 

64 raise SyntaxError(msg) 

65 if s[0] != 35: # ie. when not a comment: '#' 

66 break 

67 

68 # parse header line (already read) 

69 s = s.strip().split() 

70 

71 self._mode = "P" 

72 self._size = int(s[0]), int(s[1]) 

73 

74 self.palette = ImagePalette.raw("RGB", PALETTE) 

75 

76 self.tile = [("raw", (0, 0) + self.size, self.fp.tell(), (self.mode, 0, 1))] 

77 

78 

79# -------------------------------------------------------------------- 

80 

81Image.register_open(XVThumbImageFile.format, XVThumbImageFile, _accept)