split platform

lib/python3.5/site-packages/PIL/SgiImagePlugin.py

@@ -0,0 +1,89 @@
+#
+# The Python Imaging Library.
+# $Id$
+#
+# SGI image file handling
+#
+# See "The SGI Image File Format (Draft version 0.97)", Paul Haeberli.
+# <ftp://ftp.sgi.com/graphics/SGIIMAGESPEC>
+#
+# History:
+# 1995-09-10 fl   Created
+#
+# Copyright (c) 2008 by Karsten Hiddemann.
+# Copyright (c) 1997 by Secret Labs AB.
+# Copyright (c) 1995 by Fredrik Lundh.
+#
+# See the README file for information on usage and redistribution.
+#
+
+
+from PIL import Image, ImageFile, _binary
+
+__version__ = "0.2"
+
+i8 = _binary.i8
+i16 = _binary.i16be
+
+
+def _accept(prefix):
+    return len(prefix) >= 2 and i16(prefix) == 474
+
+
+##
+# Image plugin for SGI images.
+
+class SgiImageFile(ImageFile.ImageFile):
+
+    format = "SGI"
+    format_description = "SGI Image File Format"
+
+    def _open(self):
+
+        # HEAD
+        s = self.fp.read(512)
+        if i16(s) != 474:
+            raise ValueError("Not an SGI image file")
+
+        # relevant header entries
+        compression = i8(s[2])
+
+        # bytes, dimension, zsize
+        layout = i8(s[3]), i16(s[4:]), i16(s[10:])
+
+        # determine mode from bytes/zsize
+        if layout == (1, 2, 1) or layout == (1, 1, 1):
+            self.mode = "L"
+        elif layout == (1, 3, 3):
+            self.mode = "RGB"
+        elif layout == (1, 3, 4):
+            self.mode = "RGBA"
+        else:
+            raise ValueError("Unsupported SGI image mode")
+
+        # size
+        self.size = i16(s[6:]), i16(s[8:])
+
+        # decoder info
+        if compression == 0:
+            offset = 512
+            pagesize = self.size[0]*self.size[1]*layout[0]
+            self.tile = []
+            for layer in self.mode:
+                self.tile.append(
+                    ("raw", (0, 0)+self.size, offset, (layer, 0, -1)))
+                offset = offset + pagesize
+        elif compression == 1:
+            raise ValueError("SGI RLE encoding not supported")
+
+#
+# registry
+
+Image.register_open(SgiImageFile.format, SgiImageFile, _accept)
+
+Image.register_extension(SgiImageFile.format, ".bw")
+Image.register_extension(SgiImageFile.format, ".rgb")
+Image.register_extension(SgiImageFile.format, ".rgba")
+Image.register_extension(SgiImageFile.format, ".sgi")
+
+# End of file