104 lines
2.2 KiB
Python
104 lines
2.2 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# MSP file handling
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#
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# This is the format used by the Paint program in Windows 1 and 2.
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#
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# History:
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# 95-09-05 fl Created
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# 97-01-03 fl Read/write MSP images
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#
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# Copyright (c) Secret Labs AB 1997.
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# Copyright (c) Fredrik Lundh 1995-97.
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#
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# See the README file for information on usage and redistribution.
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#
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from PIL import Image, ImageFile, _binary
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__version__ = "0.1"
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#
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# read MSP files
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i16 = _binary.i16le
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def _accept(prefix):
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return prefix[:4] in [b"DanM", b"LinS"]
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##
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# Image plugin for Windows MSP images. This plugin supports both
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# uncompressed (Windows 1.0).
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class MspImageFile(ImageFile.ImageFile):
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format = "MSP"
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format_description = "Windows Paint"
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def _open(self):
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# Header
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s = self.fp.read(32)
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if s[:4] not in [b"DanM", b"LinS"]:
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raise SyntaxError("not an MSP file")
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# Header checksum
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checksum = 0
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for i in range(0, 32, 2):
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checksum = checksum ^ i16(s[i:i+2])
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if checksum != 0:
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raise SyntaxError("bad MSP checksum")
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self.mode = "1"
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self.size = i16(s[4:]), i16(s[6:])
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if s[:4] == b"DanM":
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self.tile = [("raw", (0, 0)+self.size, 32, ("1", 0, 1))]
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else:
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self.tile = [("msp", (0, 0)+self.size, 32+2*self.size[1], None)]
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#
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# write MSP files (uncompressed only)
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o16 = _binary.o16le
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def _save(im, fp, filename):
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if im.mode != "1":
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raise IOError("cannot write mode %s as MSP" % im.mode)
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# create MSP header
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header = [0] * 16
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header[0], header[1] = i16(b"Da"), i16(b"nM") # version 1
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header[2], header[3] = im.size
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header[4], header[5] = 1, 1
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header[6], header[7] = 1, 1
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header[8], header[9] = im.size
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checksum = 0
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for h in header:
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checksum = checksum ^ h
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header[12] = checksum # FIXME: is this the right field?
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# header
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for h in header:
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fp.write(o16(h))
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# image body
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ImageFile._save(im, fp, [("raw", (0, 0)+im.size, 32, ("1", 0, 1))])
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#
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# registry
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Image.register_open(MspImageFile.format, MspImageFile, _accept)
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Image.register_save(MspImageFile.format, _save)
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Image.register_extension(MspImageFile.format, ".msp")
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