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| 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 |
| 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 */ |
| 49 public int getNum() { |
| 50 return num; |
| 51 } |
| 52 |
| 53 /** |
| 54 * Returns denominator |
| 55 * |
| 56 * @return denominator |
| 57 */ |
| 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 */ |
| 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 */ |
| 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 */ |
| 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 } |
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