gernotbelger@8910: /** Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
gernotbelger@8910:  * Software engineering by
gernotbelger@8910:  *  Björnsen Beratende Ingenieure GmbH
gernotbelger@8910:  *  Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
gernotbelger@8910:  *
gernotbelger@8910:  * This file is Free Software under the GNU AGPL (>=v3)
gernotbelger@8910:  * and comes with ABSOLUTELY NO WARRANTY! Check out the
gernotbelger@8910:  * documentation coming with Dive4Elements River for details.
gernotbelger@8910:  */
gernotbelger@8910: package org.dive4elements.river.jfree;
gernotbelger@8910: 
gernotbelger@8910: import java.awt.Color;
gernotbelger@8910: import java.awt.image.LookupTable;
gernotbelger@8910: 
gernotbelger@8910: final class ColorMapper extends LookupTable {
gernotbelger@8910: 
gernotbelger@8910:     private final int[] from;
gernotbelger@8910:     private final int[] to;
gernotbelger@8910: 
gernotbelger@8910:     public ColorMapper(final Color from, final Color to) {
gernotbelger@8910:         super(0, 4);
gernotbelger@8910: 
gernotbelger@8910:         this.from = new int[] { from.getRed(), from.getGreen(), from.getBlue(), from.getAlpha(), };
gernotbelger@8910:         this.to = new int[] { to.getRed(), to.getGreen(), to.getBlue(), to.getAlpha(), };
gernotbelger@8910:     }
gernotbelger@8910: 
gernotbelger@8910:     @Override
gernotbelger@8910:     public int[] lookupPixel(final int[] src, final int[] dest) {
gernotbelger@8910:         final int[] out = dest == null ? new int[src.length] : dest;
gernotbelger@8910: 
gernotbelger@8910:         // REMARK: only compare rgb, so we even keep the transparency level
gernotbelger@8910:         if (src[0] == this.from[0] && src[1] == this.from[1] && src[2] == this.from[2]) {
gernotbelger@8910:             out[0] = this.to[0];
gernotbelger@8910:             out[1] = this.to[1];
gernotbelger@8910:             out[2] = this.to[2];
gernotbelger@8910:             out[2] = src[3];
gernotbelger@8910:         } else {
gernotbelger@8910:             System.arraycopy(src, 0, out, 0, src.length);
gernotbelger@8910:         }
gernotbelger@8910: 
gernotbelger@8910:         return out;
gernotbelger@8910:     }
gernotbelger@8910: }