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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]
|
|
