Coverage for /usr/lib/python3/dist-packages/PIL/ImageMode.py: 36%

1# 

2# The Python Imaging Library. 

3# $Id$ 

4# 

5# standard mode descriptors 

6# 

7# History: 

8# 2006-03-20 fl Added 

9# 

10# Copyright (c) 2006 by Secret Labs AB. 

11# Copyright (c) 2006 by Fredrik Lundh. 

12# 

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

14# 

15from __future__ import annotations 

16 

17import sys 

18from functools import lru_cache 

19 

20 

21class ModeDescriptor: 

22 """Wrapper for mode strings.""" 

23 

24 def __init__( 

25 self, 

26 mode: str, 

27 bands: tuple[str, ...], 

28 basemode: str, 

29 basetype: str, 

30 typestr: str, 

31 ) -> None: 

32 self.mode = mode 

33 self.bands = bands 

34 self.basemode = basemode 

35 self.basetype = basetype 

36 self.typestr = typestr 

37 

38 def __str__(self) -> str: 

39 return self.mode 

40 

41 

42@lru_cache 

43def getmode(mode: str) -> ModeDescriptor: 

44 """Gets a mode descriptor for the given mode.""" 

45 # initialize mode cache 

46 endian = "<" if sys.byteorder == "little" else ">" 

47 

48 modes = { 

49 # core modes 

50 # Bits need to be extended to bytes 

51 "1": ("L", "L", ("1",), "|b1"), 

52 "L": ("L", "L", ("L",), "|u1"), 

53 "I": ("L", "I", ("I",), endian + "i4"), 

54 "F": ("L", "F", ("F",), endian + "f4"), 

55 "P": ("P", "L", ("P",), "|u1"), 

56 "RGB": ("RGB", "L", ("R", "G", "B"), "|u1"), 

57 "RGBX": ("RGB", "L", ("R", "G", "B", "X"), "|u1"), 

58 "RGBA": ("RGB", "L", ("R", "G", "B", "A"), "|u1"), 

59 "CMYK": ("RGB", "L", ("C", "M", "Y", "K"), "|u1"), 

60 "YCbCr": ("RGB", "L", ("Y", "Cb", "Cr"), "|u1"), 

61 # UNDONE - unsigned |u1i1i1 

62 "LAB": ("RGB", "L", ("L", "A", "B"), "|u1"), 

63 "HSV": ("RGB", "L", ("H", "S", "V"), "|u1"), 

64 # extra experimental modes 

65 "RGBa": ("RGB", "L", ("R", "G", "B", "a"), "|u1"), 

66 "BGR;15": ("RGB", "L", ("B", "G", "R"), "|u1"), 

67 "BGR;16": ("RGB", "L", ("B", "G", "R"), "|u1"), 

68 "BGR;24": ("RGB", "L", ("B", "G", "R"), "|u1"), 

69 "LA": ("L", "L", ("L", "A"), "|u1"), 

70 "La": ("L", "L", ("L", "a"), "|u1"), 

71 "PA": ("RGB", "L", ("P", "A"), "|u1"), 

72 } 

73 if mode in modes: 

74 base_mode, base_type, bands, type_str = modes[mode] 

75 return ModeDescriptor(mode, bands, base_mode, base_type, type_str) 

76 

77 mapping_modes = { 

78 # I;16 == I;16L, and I;32 == I;32L 

79 "I;16": "<u2", 

80 "I;16S": "<i2", 

81 "I;16L": "<u2", 

82 "I;16LS": "<i2", 

83 "I;16B": ">u2", 

84 "I;16BS": ">i2", 

85 "I;16N": endian + "u2", 

86 "I;16NS": endian + "i2", 

87 "I;32": "<u4", 

88 "I;32B": ">u4", 

89 "I;32L": "<u4", 

90 "I;32S": "<i4", 

91 "I;32BS": ">i4", 

92 "I;32LS": "<i4", 

93 } 

94 

95 type_str = mapping_modes[mode] 

96 return ModeDescriptor(mode, ("I",), "L", "L", type_str)