1 files changed, 91 insertions, 0 deletions
diff --git a/PIL/SgiImagePlugin.py b/PIL/SgiImagePlugin.py
new file mode 100644
index 0000000..0ab741e
--- /dev/null
+++ b/PIL/SgiImagePlugin.py
@@ -0,0 +1,91 @@
+#
+# The Python Imaging Library.
+# $Id: SgiImagePlugin.py 2134 2004-10-06 08:55:20Z fredrik $
+#
+# 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) Secret Labs AB 1997.
+# Copyright (c) Fredrik Lundh 1995.
+#
+# See the README file for information on usage and redistribution.
+#
+
+
+__version__ = "0.1"
+
+
+import string
+import Image, ImageFile
+
+
+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 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 SyntaxError, "not an SGI image file"
+
+        # relevant header entries
+        compression = ord(s[2])
+
+        # bytes, dimension, zsize
+        layout = ord(s[3]), i16(s[4:]), i16(s[10:])
+
+        # determine mode from bytes/zsize
+        if layout == (1, 2, 1):
+            self.mode = "L"
+        elif layout == (1, 3, 3):
+            self.mode = "RGB"
+        else:
+            raise SyntaxError, "unsupported SGI image mode"
+
+        # size
+        self.size = i16(s[6:]), i16(s[8:])
+
+        # decoder info
+        if compression == 0:
+            if self.mode == "RGB":
+                # RGB images are band interleaved
+                size = self.size[0]*self.size[1]
+                self.tile = [("raw", (0,0)+self.size, 512, ("R",0,1)),
+                             ("raw", (0,0)+self.size, 512+size, ("G",0,1)),
+                             ("raw", (0,0)+self.size, 512+2*size, ("B",0,1))]
+            else:
+                self.tile = [("raw", (0,0)+self.size, 512, (self.mode, 0, 1))]
+        if compression == 1:
+            self.tile = [("sgi_rle", (0,0)+self.size, 512, (self.mode, 0, 1))]
+
+#
+# registry
+
+Image.register_open("SGI", SgiImageFile, _accept)
+
+Image.register_extension("SGI", ".bw")
+Image.register_extension("SGI", ".rgb")
+Image.register_extension("SGI", ".rgba")
+
+Image.register_extension("SGI", ".sgi") # really?