#
# 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.
#
__version__ = "0.1"
import Image, ImageFile
#
# read MSP files
def i16(c):
return ord(c[0]) + (ord(c[1])<<8)
def _accept(prefix):
return prefix[:4] in ["DanM", "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 ["DanM", "LinS"]:
raise SyntaxError, "not an MSP file"
# Header checksum
sum = 0
for i in range(0, 32, 2):
sum = sum ^ i16(s[i:i+2])
if sum != 0:
raise SyntaxError, "bad MSP checksum"
self.mode = "1"
self.size = i16(s[4:]), i16(s[6:])
if s[:4] == "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)
def o16(i):
return chr(i&255) + chr(i>>8&255)
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("Da"), i16("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
sum = 0
for h in header:
sum = sum ^ h
header[12] = sum # 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("MSP", MspImageFile, _accept)
Image.register_save("MSP", _save)
Image.register_extension("MSP", ".msp")
|