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105 lines
2.8 KiB
Python
105 lines
2.8 KiB
Python
#
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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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from PIL import Image, ImageFile, ImagePalette, _binary
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__version__ = "0.3"
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i32 = _binary.i32be
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def _accept(prefix):
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return len(prefix) >= 4 and 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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file_type = i32(s[20:24])
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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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if file_type == 3:
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self.mode, rawmode = "RGB", "RGB"
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else:
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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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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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# file type: Type is the version (or flavor) of the bitmap
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# file. The following values are typically found in the Type
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# field:
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# 0000h Old
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# 0001h Standard
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# 0002h Byte-encoded
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# 0003h RGB format
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# 0004h TIFF format
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# 0005h IFF format
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# FFFFh Experimental
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# Old and standard are the same, except for the length tag.
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# byte-encoded is run-length-encoded
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# RGB looks similar to standard, but RGB byte order
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# TIFF and IFF mean that they were converted from T/IFF
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# Experimental means that it's something else.
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# (http://www.fileformat.info/format/sunraster/egff.htm)
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if file_type in (0, 1, 3, 4, 5):
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self.tile = [("raw", (0, 0)+self.size, offset, (rawmode, stride))]
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elif file_type == 2:
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self.tile = [("sun_rle", (0, 0)+self.size, offset, rawmode)]
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else:
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raise SyntaxError('Unsupported Sun Raster file type')
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#
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# registry
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Image.register_open(SunImageFile.format, SunImageFile, _accept)
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Image.register_extension(SunImageFile.format, ".ras")
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