#
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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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__version__ = "0.1"
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import Image, ImageFile
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#
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# read MSP files
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def i16(c):
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return ord(c[0]) + (ord(c[1])<<8)
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def _accept(prefix):
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return prefix[:4] in ["DanM", "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 ["DanM", "LinS"]:
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raise SyntaxError, "not an MSP file"
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# Header checksum
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sum = 0
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for i in range(0, 32, 2):
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sum = sum ^ i16(s[i:i+2])
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if sum != 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] == "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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def o16(i):
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return chr(i&255) + chr(i>>8&255)
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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("Da"), i16("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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sum = 0
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for h in header:
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sum = sum ^ h
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header[12] = sum # 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("MSP", MspImageFile, _accept)
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Image.register_save("MSP", _save)
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Image.register_extension("MSP", ".msp")
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