F:/My Projects/LSEngine/Modules/LSImageLib/Src/Jpeg/LSIJpegInt.h

/*
 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
 * Copyright (c) 2002-2007, Professor Benoit Macq
 * Copyright (c) 2001-2003, David Janssens
 * Copyright (c) 2002-2003, Yannick Verschueren
 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
 * Copyright (c) 2005, Herve Drolon, FreeImage Team
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * 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 __LSI_JPEGINT_H__
#define __LSI_JPEGINT_H__

#include "../LSIImageLib.h"

namespace lsi {

        class CJpegInt {
        public :
                // == Functions.
                static LSE_INLINE LSINT32 LSE_FCALL                             int_min( LSINT32 _i32A, LSINT32 _i32B );

                static LSE_INLINE LSINT32 LSE_FCALL                             int_max( LSINT32 _i32A, LSINT32 _i32B );

                static LSE_INLINE LSINT32 LSE_FCALL                             int_clamp( LSINT32 _i32A, LSINT32 _i32Min, LSINT32 _i32Max );

                static LSE_INLINE LSINT32 LSE_FCALL                             int_abs( LSINT32 _i32A );

                static LSE_INLINE LSINT32 LSE_FCALL                             int_ceildiv( LSINT32 _i32A, LSINT32 _i32B );

                static LSE_INLINE LSINT32 LSE_FCALL                             int_ceildivpow2( LSINT32 _i32A, LSINT32 _i32B );

                static LSE_INLINE LSINT32 LSE_FCALL                             int_floordivpow2( LSINT32 _i32A, LSINT32 _i32B );

                static LSE_INLINE LSINT32 LSE_FCALL                             int_floorlog2( LSINT32 _i32A );

        };


        // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
        // DEFINITIONS
        // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
        // == Functions.
        LSE_INLINE LSINT32 LSE_FCALL CJpegInt::int_min( LSINT32 _i32A, LSINT32 _i32B ) {
                return _i32A < _i32B ? _i32A : _i32B;
        }

        LSE_INLINE LSINT32 LSE_FCALL CJpegInt::int_max( LSINT32 _i32A, LSINT32 _i32B ) {
                return (_i32A > _i32B) ? _i32A : _i32B;
        }

        LSE_INLINE LSINT32 LSE_FCALL CJpegInt::int_clamp( LSINT32 _i32A, LSINT32 _i32Min, LSINT32 _i32Max ) {
                if ( _i32A < _i32Min ) { return _i32Min; }
                if ( _i32A > _i32Max ) { return _i32Max; }
                return _i32A;
        }

        LSE_INLINE LSINT32 LSE_FCALL CJpegInt::int_abs( LSINT32 _i32A ) {
                return _i32A < 0 ? -_i32A : _i32A;
        }

        LSE_INLINE LSINT32 LSE_FCALL CJpegInt::int_ceildiv( LSINT32 _i32A, LSINT32 _i32B ) {
                return (_i32A + _i32B - 1) / _i32B;
        }

        LSE_INLINE LSINT32 LSE_FCALL CJpegInt::int_ceildivpow2( LSINT32 _i32A, LSINT32 _i32B ) {
                return (_i32A + (1L << _i32B) - 1) >> _i32B;
        }

        LSE_INLINE LSINT32 LSE_FCALL CJpegInt::int_floordivpow2( LSINT32 _i32A, LSINT32 _i32B ) {
                return _i32A >> _i32B;
        }

        LSE_INLINE LSINT32 LSE_FCALL CJpegInt::int_floorlog2( LSINT32 _i32A ) {
                LSINT32 i32L;
                for ( i32L = 0; _i32A > 1; i32L++ ) {
                        _i32A >>= 1;
                }
                return i32L;
        }

}       // namespace lsi

#endif  // __LSI_JPEGINT_H__