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#
# The Python Imaging Library.
# $Id: SunImagePlugin.py 2134 2004-10-06 08:55:20Z fredrik $
#
# Sun image file handling
#
# History:
# 1995-09-10 fl Created
# 1996-05-28 fl Fixed 32-bit alignment
# 1998-12-29 fl Import ImagePalette module
# 2001-12-18 fl Fixed palette loading (from Jean-Claude Rimbault)
#
# Copyright (c) 1997-2001 by Secret Labs AB
# Copyright (c) 1995-1996 by Fredrik Lundh
#
# See the README file for information on usage and redistribution.
#
__version__ = "0.3"
import string
import Image, ImageFile, ImagePalette
def i16(c):
return ord(c[1]) + (ord(c[0])<<8)
def i32(c):
return ord(c[3]) + (ord(c[2])<<8) + (ord(c[1])<<16) + (ord(c[0])<<24)
def _accept(prefix):
return i32(prefix) == 0x59a66a95
##
# Image plugin for Sun raster files.
class SunImageFile(ImageFile.ImageFile):
format = "SUN"
format_description = "Sun Raster File"
def _open(self):
# HEAD
s = self.fp.read(32)
if i32(s) != 0x59a66a95:
raise SyntaxError, "not an SUN raster file"
offset = 32
self.size = i32(s[4:8]), i32(s[8:12])
depth = i32(s[12:16])
if depth == 1:
self.mode, rawmode = "1", "1;I"
elif depth == 8:
self.mode = rawmode = "L"
elif depth == 24:
self.mode, rawmode = "RGB", "BGR"
else:
raise SyntaxError, "unsupported mode"
compression = i32(s[20:24])
if i32(s[24:28]) != 0:
length = i32(s[28:32])
offset = offset + length
self.palette = ImagePalette.raw("RGB;L", self.fp.read(length))
if self.mode == "L":
self.mode = rawmode = "P"
stride = (((self.size[0] * depth + 7) / 8) + 3) & (~3)
if compression == 1:
self.tile = [("raw", (0,0)+self.size, offset, (rawmode, stride))]
elif compression == 2:
self.tile = [("sun_rle", (0,0)+self.size, offset, rawmode)]
#
# registry
Image.register_open("SUN", SunImageFile, _accept)
Image.register_extension("SUN", ".ras")
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