Viewing file:  MspImagePlugin.py (2.21 KB) -rw-r--r--
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#
# The Python Imaging Library.
# $Id$
#
# MSP file handling
#
# This is the format used by the Paint program in Windows 1 and 2.
#
# History:
# 95-09-05 fl Created
# 97-01-03 fl Read/write MSP images
#
# Copyright (c) Secret Labs AB 1997.
# Copyright (c) Fredrik Lundh 1995-97.
#
# See the README file for information on usage and redistribution.
#
from PIL import Image, ImageFile, _binary
__version__ = "0.1"
#
# read MSP files
i16 = _binary.i16le
def _accept(prefix):
return prefix[:4] in [b"DanM", b"LinS"]
##
# Image plugin for Windows MSP images. This plugin supports both
# uncompressed (Windows 1.0).
class MspImageFile(ImageFile.ImageFile):
format = "MSP"
format_description = "Windows Paint"
def _open(self):
# Header
s = self.fp.read(32)
if s[:4] not in [b"DanM", b"LinS"]:
raise SyntaxError("not an MSP file")
# Header checksum
checksum = 0
for i in range(0, 32, 2):
checksum = checksum ^ i16(s[i:i+2])
if checksum != 0:
raise SyntaxError("bad MSP checksum")
self.mode = "1"
self.size = i16(s[4:]), i16(s[6:])
if s[:4] == b"DanM":
self.tile = [("raw", (0, 0)+self.size, 32, ("1", 0, 1))]
else:
self.tile = [("msp", (0, 0)+self.size, 32+2*self.size[1], None)]
#
# write MSP files (uncompressed only)
o16 = _binary.o16le
def _save(im, fp, filename):
if im.mode != "1":
raise IOError("cannot write mode %s as MSP" % im.mode)
# create MSP header
header = [0] * 16
header[0], header[1] = i16(b"Da"), i16(b"nM") # version 1
header[2], header[3] = im.size
header[4], header[5] = 1, 1
header[6], header[7] = 1, 1
header[8], header[9] = im.size
checksum = 0
for h in header:
checksum = checksum ^ h
header[12] = checksum # FIXME: is this the right field?
# header
for h in header:
fp.write(o16(h))
# image body
ImageFile._save(im, fp, [("raw", (0, 0)+im.size, 32, ("1", 0, 1))])
#
# registry
Image.register_open(MspImageFile.format, MspImageFile, _accept)
Image.register_save(MspImageFile.format, _save)
Image.register_extension(MspImageFile.format, ".msp")
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