001/*
002 * This file is part of McIDAS-V
003 *
004 * Copyright 2007-2025
005 * Space Science and Engineering Center (SSEC)
006 * University of Wisconsin - Madison
007 * 1225 W. Dayton Street, Madison, WI 53706, USA
008 * https://www.ssec.wisc.edu/mcidas/
009 * 
010 * All Rights Reserved
011 * 
012 * McIDAS-V is built on Unidata's IDV and SSEC's VisAD libraries, and
013 * some McIDAS-V source code is based on IDV and VisAD source code.  
014 * 
015 * McIDAS-V is free software; you can redistribute it and/or modify
016 * it under the terms of the GNU Lesser Public License as published by
017 * the Free Software Foundation; either version 3 of the License, or
018 * (at your option) any later version.
019 * 
020 * McIDAS-V is distributed in the hope that it will be useful,
021 * but WITHOUT ANY WARRANTY; without even the implied warranty of
022 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
023 * GNU Lesser Public License for more details.
024 * 
025 * You should have received a copy of the GNU Lesser Public License
026 * along with this program.  If not, see https://www.gnu.org/licenses/.
027 */
028
029package edu.wisc.ssec.mcidasv.data;
030
031import org.slf4j.Logger;
032import org.slf4j.LoggerFactory;
033
034public class SandwichSpeedup {
035
036    private static final Logger logger =
037            LoggerFactory.getLogger(SandwichSpeedup.class);
038
039    public static void sandwichSpeedup(float[] scaledFloats,
040                                       float[] floatsIR,
041                                       float[] rFloats,
042                                       float[] gFloats,
043                                       float[] bFloats,
044                                       float[] rTable,
045                                       float[] gTable,
046                                       float[] bTable,
047                                       float minIR,
048                                       float maxIR,
049                                       int nCols,
050                                       float noIRContribution)
051    {
052        for (int i = 0; i < scaledFloats.length; i++) {
053            // set anything colder than threshold to r,g,b from color table,
054            // otherwise just set to 1 (so that result after multiply is just
055            // the vis image)
056            if (floatsIR[i] < maxIR) {
057
058                // if anything falls below the minIR, set it to the minIR
059                // (scaledFloats=0)
060                if (floatsIR[i] < minIR) {
061                    // java conversion note: "pixel" is just scaledFloats at
062                    // current index
063                    scaledFloats[i] = 0;
064                }
065
066                // need to convert float ranging from 0.0 to 1.0 into integer
067                // index ranging from 0 to nCols testing
068                int ind = (int)(scaledFloats[i] * nCols);
069
070                rFloats[i] = rTable[ind];
071                gFloats[i] = gTable[ind];
072                bFloats[i] = bTable[ind];
073            } else {
074                rFloats[i] = noIRContribution; // previously was set to 1
075                gFloats[i] = noIRContribution; // see note for rFloats
076                bFloats[i] = noIRContribution; // see note for rFloats
077            }
078        }
079    }
080}