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cs440-acg/ext/openexr/OpenEXR/IlmImf/ImfVersion.h

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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
+// Digital Ltd. LLC
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+// *       Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// *       Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// *       Neither the name of Industrial Light & Magic nor the names of
+// its contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission. 
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+///////////////////////////////////////////////////////////////////////////
+
+
+#ifndef INCLUDED_IMF_VERSION_H
+#define INCLUDED_IMF_VERSION_H
+
+//-----------------------------------------------------------------------------
+//
+//	Magic and version number.
+//
+//-----------------------------------------------------------------------------
+
+#include "ImfExport.h"
+#include "ImfNamespace.h"
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
+
+//
+// The MAGIC number is stored in the first four bytes of every
+// OpenEXR image file.  This can be used to quickly test whether
+// a given file is an OpenEXR image file (see isImfMagic(), below).
+//
+
+const int MAGIC = 20000630;
+
+
+//
+// The second item in each OpenEXR image file, right after the
+// magic number, is a four-byte file version identifier.  Depending
+// on a file's version identifier, a file reader can enable various
+// backwards-compatibility switches, or it can quickly reject files
+// that it cannot read.
+//
+// The version identifier is split into an 8-bit version number,
+// and a 24-bit flags field.
+//
+
+const int VERSION_NUMBER_FIELD	= 0x000000ff;
+const int VERSION_FLAGS_FIELD	= 0xffffff00;
+
+
+//
+// Value that goes into VERSION_NUMBER_FIELD.
+//
+
+const int EXR_VERSION		= 2;
+
+
+//
+// Flags that can go into VERSION_FLAGS_FIELD.
+// Flags can only occupy the 1 bits in VERSION_FLAGS_FIELD.
+//
+
+const int TILED_FLAG		= 0x00000200;   // File is tiled
+
+const int LONG_NAMES_FLAG       = 0x00000400;   // File contains long
+                                                // attribute or channel
+                                                // names
+
+const int NON_IMAGE_FLAG        = 0x00000800;   // File has at least one part
+                                                // which is not a regular
+                                                // scanline image or regular tiled image
+                                                // (that is, it is a deep format)
+
+const int MULTI_PART_FILE_FLAG  = 0x00001000;   // File has multiple parts
+
+//
+// Bitwise OR of all known flags.
+//
+
+const int ALL_FLAGS		= TILED_FLAG | LONG_NAMES_FLAG |
+                                  NON_IMAGE_FLAG | MULTI_PART_FILE_FLAG;
+
+
+//
+// Utility functions
+//
+
+inline bool  isTiled (int version)	{return !!(version & TILED_FLAG);}
+inline bool  isMultiPart (int version)  {return !!(version & MULTI_PART_FILE_FLAG); }
+inline bool  isNonImage(int version)    {return !!(version & NON_IMAGE_FLAG); }
+inline int   makeTiled (int version)	{return version | TILED_FLAG;}
+inline int   makeNotTiled (int version) {return version & ~TILED_FLAG;}
+inline int   getVersion (int version)	{return version & VERSION_NUMBER_FIELD;}
+inline int   getFlags (int version)	{return version & VERSION_FLAGS_FIELD;}
+inline bool  supportsFlags (int flags)	{return !(flags & ~ALL_FLAGS);}
+
+
+//
+// Given the first four bytes of a file, returns true if the
+// file is probably an OpenEXR image file, false if not.
+//
+
+IMF_EXPORT 
+bool	     isImfMagic (const char bytes[4]);
+
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
+
+
+
+
+
+#endif