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