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| 5496 | leency | 1 | /* |
| 2 | * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium |
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| 3 | * Copyright (c) 2002-2007, Professor Benoit Macq |
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| 4 | * Copyright (c) 2001-2003, David Janssens |
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| 5 | * Copyright (c) 2002-2003, Yannick Verschueren |
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| 6 | * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe |
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| 7 | * Copyright (c) 2005, Herve Drolon, FreeImage Team |
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| 8 | * All rights reserved. |
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| 9 | * |
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| 10 | * Redistribution and use in source and binary forms, with or without |
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| 11 | * modification, are permitted provided that the following conditions |
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| 12 | * are met: |
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| 13 | * 1. Redistributions of source code must retain the above copyright |
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| 14 | * notice, this list of conditions and the following disclaimer. |
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 16 | * notice, this list of conditions and the following disclaimer in the |
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| 17 | * documentation and/or other materials provided with the distribution. |
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| 18 | * |
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' |
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| 20 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| 23 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 29 | * POSSIBILITY OF SUCH DAMAGE. |
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| 30 | */ |
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| 31 | #ifndef __INT_H |
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| 32 | #define __INT_H |
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| 33 | /** |
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| 34 | @file int.h |
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| 35 | @brief Implementation of operations on integers (INT) |
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| 36 | |||
| 37 | The functions in INT.H have for goal to realize operations on integers. |
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| 38 | */ |
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| 39 | |||
| 40 | /** @defgroup INT INT - Implementation of operations on integers */ |
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| 41 | /*@{*/ |
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| 42 | |||
| 43 | /** @name Exported functions (see also openjpeg.h) */ |
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| 44 | /*@{*/ |
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| 45 | /* ----------------------------------------------------------------------- */ |
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| 46 | /** |
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| 47 | Get the minimum of two integers |
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| 48 | @return Returns a if a < b else b |
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| 49 | */ |
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| 50 | static INLINE int int_min(int a, int b) { |
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| 51 | return a < b ? a : b; |
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| 52 | } |
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| 53 | /** |
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| 54 | Get the maximum of two integers |
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| 55 | @return Returns a if a > b else b |
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| 56 | */ |
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| 57 | static INLINE int int_max(int a, int b) { |
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| 58 | return (a > b) ? a : b; |
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| 59 | } |
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| 60 | /** |
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| 61 | Clamp an integer inside an interval |
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| 62 | @return |
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| 63 | |||
| 64 | |||
| 65 | |||
| 66 | |||
| 67 | |||
| 68 | */ |
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| 69 | static INLINE int int_clamp(int a, int min, int max) { |
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| 70 | if (a < min) |
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| 71 | return min; |
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| 72 | if (a > max) |
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| 73 | return max; |
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| 74 | return a; |
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| 75 | } |
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| 76 | /** |
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| 77 | @return Get absolute value of integer |
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| 78 | */ |
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| 79 | static INLINE int int_abs(int a) { |
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| 80 | return a < 0 ? -a : a; |
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| 81 | } |
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| 82 | /** |
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| 83 | Divide an integer and round upwards |
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| 84 | @return Returns a divided by b |
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| 85 | */ |
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| 86 | static INLINE int int_ceildiv(int a, int b) { |
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| 87 | return (a + b - 1) / b; |
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| 88 | } |
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| 89 | /** |
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| 90 | Divide an integer by a power of 2 and round upwards |
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| 91 | @return Returns a divided by 2^b |
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| 92 | */ |
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| 93 | static INLINE int int_ceildivpow2(int a, int b) { |
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| 94 | return (a + (1 << b) - 1) >> b; |
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| 95 | } |
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| 96 | /** |
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| 97 | Divide an integer by a power of 2 and round downwards |
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| 98 | @return Returns a divided by 2^b |
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| 99 | */ |
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| 100 | static INLINE int int_floordivpow2(int a, int b) { |
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| 101 | return a >> b; |
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| 102 | } |
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| 103 | /** |
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| 104 | Get logarithm of an integer and round downwards |
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| 105 | @return Returns log2(a) |
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| 106 | */ |
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| 107 | static INLINE int int_floorlog2(int a) { |
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| 108 | int l; |
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| 109 | for (l = 0; a > 1; l++) { |
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| 110 | a >>= 1; |
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| 111 | } |
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| 112 | return l; |
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| 113 | } |
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| 114 | /* ----------------------------------------------------------------------- */ |
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| 115 | /*@}*/ |
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| 116 | |||
| 117 | /*@}*/ |
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| 118 | |||
| 119 | #endif |