001/* ***** BEGIN LICENSE BLOCK *****
002 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
003 *
004 * The contents of this file are subject to the Mozilla Public License Version
005 * 1.1 (the "License"); you may not use this file except in compliance with
006 * the License. You may obtain a copy of the License at
007 * http://www.mozilla.org/MPL/
008 *
009 * Software distributed under the License is distributed on an "AS IS" basis,
010 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
011 * for the specific language governing rights and limitations under the
012 * License.
013 *
014 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
015 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
016 *
017 * The Initial Developer of the Original Code is
018 * Agfa Healthcare.
019 * Portions created by the Initial Developer are Copyright (C) 2013
020 * the Initial Developer. All Rights Reserved.
021 *
022 * Contributor(s):
023 * See @authors listed below
024 *
025 * Alternatively, the contents of this file may be used under the terms of
026 * either the GNU General Public License Version 2 or later (the "GPL"), or
027 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
028 * in which case the provisions of the GPL or the LGPL are applicable instead
029 * of those above. If you wish to allow use of your version of this file only
030 * under the terms of either the GPL or the LGPL, and not to allow others to
031 * use your version of this file under the terms of the MPL, indicate your
032 * decision by deleting the provisions above and replace them with the notice
033 * and other provisions required by the GPL or the LGPL. If you do not delete
034 * the provisions above, a recipient may use your version of this file under
035 * the terms of any one of the MPL, the GPL or the LGPL.
036 *
037 * ***** END LICENSE BLOCK ***** */
038
039package org.dcm4che3.image;
040
041/**
042 * @author Gunter Zeilinger <gunterze@gmail.com>
043 *
044 */
045public enum ColorSubsampling {
046    YBR_XXX_422 {
047        @Override
048        public int frameLength(int w, int h) {
049            return w * h * 2;
050        }
051
052        @Override
053        public int indexOfY(int x, int y, int w) {
054            return (w * y + x) * 2 - (x%2);
055        }
056
057        @Override
058        public int indexOfBR(int x, int y, int w) {
059            return (w * y * 2) + ((x>>1)<<2) + 2;
060        }
061    },
062    YBR_XXX_420 {
063        @Override
064        public int frameLength(int w, int h) {
065            return w * h / 2 * 3;
066        }
067
068        @Override
069        public int indexOfY(int x, int y, int w) {
070            int withoutBR = y / 2;
071            int withBR = y - withoutBR;
072            return w * (withBR * 2 + withoutBR)
073                    + ((y%2==0) ? (x * 2 - (x%2)) : x);
074        }
075
076        @Override
077        public int indexOfBR(int x, int y, int w) {
078            return w * (y / 2) * 3 + ((x>>1)<<2) + 2;
079        }
080    };
081
082    public abstract int frameLength(int w, int h);
083
084    public abstract int indexOfY(int x, int y, int w);
085
086    public abstract int indexOfBR(int x, int y, int w);
087}