PIL.SunImagePlugin 源代码

#
# The Python Imaging Library.
# $Id$
#
# 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.
#


from PIL import Image, ImageFile, ImagePalette, _binary

__version__ = "0.3"

i32 = _binary.i32be


def _accept(prefix):
    return len(prefix) >= 4 and i32(prefix) == 0x59a66a95


##
# Image plugin for Sun raster files.

[文档]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(SunImageFile.format, SunImageFile, _accept) Image.register_extension(SunImageFile.format, ".ras")