Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.11/site-packages/PIL/ImageMode.py: 78%

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 

19from typing import NamedTuple 

20 

21 

22class ModeDescriptor(NamedTuple): 

23 """Wrapper for mode strings.""" 

24 

25 mode: str 

26 bands: tuple[str, ...] 

27 basemode: str 

28 basetype: str 

29 typestr: str 

30 

31 def __str__(self) -> str: 

32 return self.mode 

33 

34 

35@lru_cache 

36def getmode(mode: str) -> ModeDescriptor: 

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

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

39 

40 modes = { 

41 # core modes 

42 # Bits need to be extended to bytes 

43 "1": ("L", "L", ("1",), "|b1"), 

44 "L": ("L", "L", ("L",), "|u1"), 

45 "I": ("L", "I", ("I",), f"{endian}i4"), 

46 "F": ("L", "F", ("F",), f"{endian}f4"), 

47 "P": ("P", "L", ("P",), "|u1"), 

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

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

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

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

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

53 # UNDONE - unsigned |u1i1i1 

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

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

56 # extra experimental modes 

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

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

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

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

61 } 

62 if mode in modes: 

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

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

65 

66 mapping_modes = { 

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

68 "I;16": "<u2", 

69 "I;16S": "<i2", 

70 "I;16L": "<u2", 

71 "I;16LS": "<i2", 

72 "I;16B": ">u2", 

73 "I;16BS": ">i2", 

74 "I;16N": f"{endian}u2", 

75 "I;16NS": f"{endian}i2", 

76 "I;32": "<u4", 

77 "I;32B": ">u4", 

78 "I;32L": "<u4", 

79 "I;32S": "<i4", 

80 "I;32BS": ">i4", 

81 "I;32LS": "<i4", 

82 } 

83 

84 type_str = mapping_modes[mode] 

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