mirror of
https://github.com/opencv/opencv.git
synced 2024-11-30 06:10:02 +08:00
121 lines
3.9 KiB
C++
121 lines
3.9 KiB
C++
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// 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.
|
|
//
|
|
//-----------------------------------------------------------------------------
|
|
|
|
|
|
namespace Imf {
|
|
|
|
|
|
//
|
|
// 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
|
|
|
|
//
|
|
// Bitwise OR of all known flags.
|
|
//
|
|
|
|
const int ALL_FLAGS = TILED_FLAG | LONG_NAMES_FLAG;
|
|
|
|
|
|
//
|
|
// Utility functions
|
|
//
|
|
|
|
inline bool isTiled (int version) {return !!(version & TILED_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.
|
|
//
|
|
|
|
bool isImfMagic (const char bytes[4]);
|
|
|
|
|
|
} // namespace Imf
|
|
|
|
#endif
|