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323 lines
8.4 KiB
C
323 lines
8.4 KiB
C
/*
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* The copyright in this software is being made available under the 2-clauses
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* BSD License, included below. This software may be subject to other third
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* party and contributor rights, including patent rights, and no such rights
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* are granted under this license.
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*
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* Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
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* Copyright (c) 2002-2014, Professor Benoit Macq
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* Copyright (c) 2001-2003, David Janssens
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* Copyright (c) 2002-2003, Yannick Verschueren
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* Copyright (c) 2003-2007, Francois-Olivier Devaux
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* Copyright (c) 2003-2014, Antonin Descampe
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* Copyright (c) 2005, Herve Drolon, FreeImage Team
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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
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* are met:
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef OPJ_INTMATH_H
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#define OPJ_INTMATH_H
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/**
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@file opj_intmath.h
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@brief Implementation of operations on integers (INT)
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The functions in OPJ_INTMATH.H have for goal to realize operations on integers.
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*/
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/** @defgroup OPJ_INTMATH OPJ_INTMATH - Implementation of operations on integers */
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/*@{*/
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/** @name Exported functions (see also openjpeg.h) */
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/*@{*/
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/* ----------------------------------------------------------------------- */
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/**
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Get the minimum of two integers
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@return Returns a if a < b else b
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*/
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static INLINE OPJ_INT32 opj_int_min(OPJ_INT32 a, OPJ_INT32 b)
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{
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return a < b ? a : b;
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}
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/**
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Get the minimum of two integers
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@return Returns a if a < b else b
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*/
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static INLINE OPJ_UINT32 opj_uint_min(OPJ_UINT32 a, OPJ_UINT32 b)
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{
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return a < b ? a : b;
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}
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/**
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Get the maximum of two integers
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@return Returns a if a > b else b
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*/
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static INLINE OPJ_INT32 opj_int_max(OPJ_INT32 a, OPJ_INT32 b)
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{
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return (a > b) ? a : b;
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}
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/**
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Get the maximum of two integers
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@return Returns a if a > b else b
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*/
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static INLINE OPJ_UINT32 opj_uint_max(OPJ_UINT32 a, OPJ_UINT32 b)
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{
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return (a > b) ? a : b;
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}
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/**
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Get the saturated sum of two unsigned integers
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@return Returns saturated sum of a+b
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*/
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static INLINE OPJ_UINT32 opj_uint_adds(OPJ_UINT32 a, OPJ_UINT32 b)
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{
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OPJ_UINT64 sum = (OPJ_UINT64)a + (OPJ_UINT64)b;
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return (OPJ_UINT32)(-(OPJ_INT32)(sum >> 32)) | (OPJ_UINT32)sum;
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}
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/**
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Get the saturated difference of two unsigned integers
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@return Returns saturated sum of a-b
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*/
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static INLINE OPJ_UINT32 opj_uint_subs(OPJ_UINT32 a, OPJ_UINT32 b)
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{
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return (a >= b) ? a - b : 0;
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}
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/**
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Clamp an integer inside an interval
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@return
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<ul>
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<li>Returns a if (min < a < max)
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<li>Returns max if (a > max)
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<li>Returns min if (a < min)
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</ul>
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*/
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static INLINE OPJ_INT32 opj_int_clamp(OPJ_INT32 a, OPJ_INT32 min,
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OPJ_INT32 max)
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{
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if (a < min) {
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return min;
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}
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if (a > max) {
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return max;
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}
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return a;
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}
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/**
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Clamp an integer inside an interval
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@return
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<ul>
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<li>Returns a if (min < a < max)
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<li>Returns max if (a > max)
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<li>Returns min if (a < min)
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</ul>
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*/
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static INLINE OPJ_INT64 opj_int64_clamp(OPJ_INT64 a, OPJ_INT64 min,
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OPJ_INT64 max)
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{
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if (a < min) {
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return min;
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}
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if (a > max) {
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return max;
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}
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return a;
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}
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/**
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@return Get absolute value of integer
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*/
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static INLINE OPJ_INT32 opj_int_abs(OPJ_INT32 a)
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{
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return a < 0 ? -a : a;
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}
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/**
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Divide an integer and round upwards
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@return Returns a divided by b
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*/
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static INLINE OPJ_INT32 opj_int_ceildiv(OPJ_INT32 a, OPJ_INT32 b)
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{
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assert(b);
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return (OPJ_INT32)(((OPJ_INT64)a + b - 1) / b);
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}
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/**
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Divide an integer and round upwards
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@return Returns a divided by b
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*/
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static INLINE OPJ_UINT32 opj_uint_ceildiv(OPJ_UINT32 a, OPJ_UINT32 b)
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{
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assert(b);
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return (OPJ_UINT32)(((OPJ_UINT64)a + b - 1) / b);
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}
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/**
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Divide an integer by a power of 2 and round upwards
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@return Returns a divided by 2^b
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*/
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static INLINE OPJ_INT32 opj_int_ceildivpow2(OPJ_INT32 a, OPJ_INT32 b)
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{
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return (OPJ_INT32)((a + ((OPJ_INT64)1 << b) - 1) >> b);
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}
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/**
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Divide a 64bits integer by a power of 2 and round upwards
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@return Returns a divided by 2^b
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*/
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static INLINE OPJ_INT32 opj_int64_ceildivpow2(OPJ_INT64 a, OPJ_INT32 b)
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{
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return (OPJ_INT32)((a + ((OPJ_INT64)1 << b) - 1) >> b);
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}
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/**
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Divide an integer by a power of 2 and round upwards
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@return Returns a divided by 2^b
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*/
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static INLINE OPJ_UINT32 opj_uint_ceildivpow2(OPJ_UINT32 a, OPJ_UINT32 b)
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{
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return (OPJ_UINT32)((a + ((OPJ_UINT64)1U << b) - 1U) >> b);
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}
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/**
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Divide an integer by a power of 2 and round downwards
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@return Returns a divided by 2^b
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*/
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static INLINE OPJ_INT32 opj_int_floordivpow2(OPJ_INT32 a, OPJ_INT32 b)
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{
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return a >> b;
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}
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/**
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Divide an integer by a power of 2 and round downwards
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@return Returns a divided by 2^b
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*/
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static INLINE OPJ_UINT32 opj_uint_floordivpow2(OPJ_UINT32 a, OPJ_UINT32 b)
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{
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return a >> b;
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}
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/**
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Get logarithm of an integer and round downwards
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@return Returns log2(a)
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*/
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static INLINE OPJ_INT32 opj_int_floorlog2(OPJ_INT32 a)
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{
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OPJ_INT32 l;
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for (l = 0; a > 1; l++) {
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a >>= 1;
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}
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return l;
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}
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/**
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Get logarithm of an integer and round downwards
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@return Returns log2(a)
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*/
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static INLINE OPJ_UINT32 opj_uint_floorlog2(OPJ_UINT32 a)
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{
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OPJ_UINT32 l;
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for (l = 0; a > 1; ++l) {
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a >>= 1;
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}
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return l;
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}
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/**
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Multiply two fixed-precision rational numbers.
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@param a
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@param b
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@return Returns a * b
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*/
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static INLINE OPJ_INT32 opj_int_fix_mul(OPJ_INT32 a, OPJ_INT32 b)
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{
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#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__INTEL_COMPILER) && defined(_M_IX86)
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OPJ_INT64 temp = __emul(a, b);
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#else
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OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ;
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#endif
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temp += 4096;
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assert((temp >> 13) <= (OPJ_INT64)0x7FFFFFFF);
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assert((temp >> 13) >= (-(OPJ_INT64)0x7FFFFFFF - (OPJ_INT64)1));
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return (OPJ_INT32)(temp >> 13);
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}
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static INLINE OPJ_INT32 opj_int_fix_mul_t1(OPJ_INT32 a, OPJ_INT32 b)
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{
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#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__INTEL_COMPILER) && defined(_M_IX86)
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OPJ_INT64 temp = __emul(a, b);
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#else
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OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ;
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#endif
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temp += 4096;
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assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) <= (OPJ_INT64)0x7FFFFFFF);
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assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) >= (-(OPJ_INT64)0x7FFFFFFF -
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(OPJ_INT64)1));
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return (OPJ_INT32)(temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) ;
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}
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/**
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Addition two signed integers with a wrap-around behaviour.
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Assumes complement-to-two signed integers.
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@param a
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@param b
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@return Returns a + b
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*/
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static INLINE OPJ_INT32 opj_int_add_no_overflow(OPJ_INT32 a, OPJ_INT32 b)
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{
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void* pa = &a;
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void* pb = &b;
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OPJ_UINT32* upa = (OPJ_UINT32*)pa;
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OPJ_UINT32* upb = (OPJ_UINT32*)pb;
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OPJ_UINT32 ures = *upa + *upb;
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void* pures = &ures;
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OPJ_INT32* ipres = (OPJ_INT32*)pures;
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return *ipres;
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}
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/**
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Subtract two signed integers with a wrap-around behaviour.
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Assumes complement-to-two signed integers.
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@param a
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@param b
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@return Returns a - b
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*/
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static INLINE OPJ_INT32 opj_int_sub_no_overflow(OPJ_INT32 a, OPJ_INT32 b)
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{
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void* pa = &a;
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void* pb = &b;
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OPJ_UINT32* upa = (OPJ_UINT32*)pa;
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OPJ_UINT32* upb = (OPJ_UINT32*)pb;
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OPJ_UINT32 ures = *upa - *upb;
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void* pures = &ures;
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OPJ_INT32* ipres = (OPJ_INT32*)pures;
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return *ipres;
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}
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/* ----------------------------------------------------------------------- */
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/*@}*/
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/*@}*/
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#endif /* OPJ_INTMATH_H */
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