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