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- #
- # The Python Imaging Library.
- # $Id$
- #
- # standard mode descriptors
- #
- # History:
- # 2006-03-20 fl Added
- #
- # Copyright (c) 2006 by Secret Labs AB.
- # Copyright (c) 2006 by Fredrik Lundh.
- #
- # See the README file for information on usage and redistribution.
- #
-
- import sys
-
- # mode descriptor cache
- _modes = None
-
-
- class ModeDescriptor:
- """Wrapper for mode strings."""
-
- def __init__(self, mode, bands, basemode, basetype, typestr):
- self.mode = mode
- self.bands = bands
- self.basemode = basemode
- self.basetype = basetype
- self.typestr = typestr
-
- def __str__(self):
- return self.mode
-
-
- def getmode(mode):
- """Gets a mode descriptor for the given mode."""
- global _modes
- if not _modes:
- # initialize mode cache
- modes = {}
- endian = "<" if sys.byteorder == "little" else ">"
- for m, (basemode, basetype, bands, typestr) in {
- # core modes
- # Bits need to be extended to bytes
- "1": ("L", "L", ("1",), "|b1"),
- "L": ("L", "L", ("L",), "|u1"),
- "I": ("L", "I", ("I",), endian + "i4"),
- "F": ("L", "F", ("F",), endian + "f4"),
- "P": ("P", "L", ("P",), "|u1"),
- "RGB": ("RGB", "L", ("R", "G", "B"), "|u1"),
- "RGBX": ("RGB", "L", ("R", "G", "B", "X"), "|u1"),
- "RGBA": ("RGB", "L", ("R", "G", "B", "A"), "|u1"),
- "CMYK": ("RGB", "L", ("C", "M", "Y", "K"), "|u1"),
- "YCbCr": ("RGB", "L", ("Y", "Cb", "Cr"), "|u1"),
- # UNDONE - unsigned |u1i1i1
- "LAB": ("RGB", "L", ("L", "A", "B"), "|u1"),
- "HSV": ("RGB", "L", ("H", "S", "V"), "|u1"),
- # extra experimental modes
- "RGBa": ("RGB", "L", ("R", "G", "B", "a"), "|u1"),
- "BGR;15": ("RGB", "L", ("B", "G", "R"), "|u1"),
- "BGR;16": ("RGB", "L", ("B", "G", "R"), "|u1"),
- "BGR;24": ("RGB", "L", ("B", "G", "R"), "|u1"),
- "LA": ("L", "L", ("L", "A"), "|u1"),
- "La": ("L", "L", ("L", "a"), "|u1"),
- "PA": ("RGB", "L", ("P", "A"), "|u1"),
- }.items():
- modes[m] = ModeDescriptor(m, bands, basemode, basetype, typestr)
- # mapping modes
- for i16mode, typestr in {
- # I;16 == I;16L, and I;32 == I;32L
- "I;16": "<u2",
- "I;16S": "<i2",
- "I;16L": "<u2",
- "I;16LS": "<i2",
- "I;16B": ">u2",
- "I;16BS": ">i2",
- "I;16N": endian + "u2",
- "I;16NS": endian + "i2",
- "I;32": "<u4",
- "I;32B": ">u4",
- "I;32L": "<u4",
- "I;32S": "<i4",
- "I;32BS": ">i4",
- "I;32LS": "<i4",
- }.items():
- modes[i16mode] = ModeDescriptor(i16mode, ("I",), "L", "L", typestr)
- # set global mode cache atomically
- _modes = modes
- return _modes[mode]
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