1 /* 2 * Copyright (C)2011 D. R. Commander. All Rights Reserved. 3 * Copyright (C)2015 Viktor Szathmáry. All Rights Reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * - Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * - Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * - Neither the name of the libjpeg-turbo Project nor the names of its 14 * contributors may be used to endorse or promote products derived from this 15 * software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS", 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE 21 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 package org.libjpegturbo.turbojpeg; 31 32 /** 33 * Fractional scaling factor 34 */ 35 public class TJScalingFactor { 36 TJScalingFactor(int num, int denom)37 public TJScalingFactor(int num, int denom) { 38 if (num < 1 || denom < 1) 39 throw new IllegalArgumentException("Numerator and denominator must be >= 1"); 40 this.num = num; 41 this.denom = denom; 42 } 43 44 /** 45 * Returns numerator 46 * 47 * @return numerator 48 */ getNum()49 public int getNum() { 50 return num; 51 } 52 53 /** 54 * Returns denominator 55 * 56 * @return denominator 57 */ getDenom()58 public int getDenom() { 59 return denom; 60 } 61 62 /** 63 * Returns the scaled value of <code>dimension</code>. This function 64 * performs the integer equivalent of 65 * <code>ceil(dimension * scalingFactor)</code>. 66 * 67 * @return the scaled value of <code>dimension</code>. 68 */ getScaled(int dimension)69 public int getScaled(int dimension) { 70 return (dimension * num + denom - 1) / denom; 71 } 72 73 /** 74 * Returns true or false, depending on whether this instance and 75 * <code>other</code> have the same numerator and denominator. 76 * 77 * @return true or false, depending on whether this instance and 78 * <code>other</code> have the same numerator and denominator. 79 */ equals(TJScalingFactor other)80 public boolean equals(TJScalingFactor other) { 81 return this.num == other.num && this.denom == other.denom; 82 } 83 84 /** 85 * Returns true or false, depending on whether this instance is equal to 86 * 1/1. 87 * 88 * @return true or false, depending on whether this instance is equal to 89 * 1/1. 90 */ isOne()91 public boolean isOne() { 92 return num == 1 && denom == 1; 93 } 94 95 /** 96 * Numerator 97 */ 98 private int num = 1; 99 100 /** 101 * Denominator 102 */ 103 private int denom = 1; 104 } 105