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/*

 * Created on 11-abril-2005

 */

package org.cresques.io.raster;

import java.awt.Image;

import java.util.Vector;

/**

 * @author Nacho Brodin <brodin_ign@gva.es>

 * 

 * Clase base para los filtros de transparencia en sus diferentes tipos

 * de datos.

 */ 

public abstract class TransparencyFilter extends RasterFilter{

        public boolean debug = false;

        //Par?metros del filtro

        protected int[][] rangesR;

        protected int[][] rangesG;

        protected int[][] rangesB;

        public int                 alpha = 0x10;

        public int                 transparencyColorRed = 0xff;

        public int                 transparencyColorGreen = 0xff;

        public int                 transparencyColorBlue = 0xff;

        public TransparencyFilter(){

                super();

        }

        /**

         * Obtiene par?metros del filtro desde la tabla Hash

         */

        public void pre(){

                //Obtenci?n de par?metros comunes a todos

                this.rangesR = (int[][])params.get("red");

                this.rangesG = (int[][])params.get("green");

                this.rangesB = (int[][])params.get("blue");

                this.alpha = ((Integer)params.get("alpha")).intValue();

                this.transparencyColorRed = ((Integer)params.get("transparencyRed")).intValue();

                this.transparencyColorGreen = ((Integer)params.get("transparencyGreen")).intValue();

                this.transparencyColorBlue = ((Integer)params.get("transparencyBlue")).intValue();

        }

        /**

         * Para dos intervalos dados, devuelve true si el intervalo B est? dentro del A y

         * false si no lo est?

         * @param intervalA

         * @param intervalB

         * @return

         */

        private boolean compareIntervals(int[][] intervalA, int[][] intervalB){

                if(intervalA != null && intervalB != null){

                        boolean equalInterval = false;

                        for(int i=0;i<intervalB.length;i++){

                                for(int j=0;j<intervalA.length;j++){

                                        if(        intervalB[i][0] >= intervalA[i][0] && 

                                                intervalB[i][1] <= intervalA[i][1]){

                                                equalInterval = true;

                                                break;

                                        }

                                }

                                if(!equalInterval)

                                        return false;

                        }

                        return true;

                }

                if(intervalA == null && intervalB == null)

                        return true;

                return false;

        }

        /**

         * Devuelve true si el filtro pasado por par?metro es equivalente a este

         * y false si no lo es.

         * @param filter        Filtro a comparar

         * @return        true si son equivalentes y false si no lo son

         */

        public boolean isEquivalent(TransparencyFilter filter){

                if(        alpha!=filter.alpha ||

                        transparencyColorRed != filter.transparencyColorRed ||

                        transparencyColorGreen != filter.transparencyColorGreen ||

                        transparencyColorBlue != filter.transparencyColorBlue)

                        return false;

                boolean equalRange = false;

                equalRange = compareIntervals((int[][])params.get("red"), (int[][])filter.params.get("red"));

                if(!equalRange)

                        return false;

                equalRange = false;

                equalRange = compareIntervals((int[][])params.get("green"), (int[][])filter.params.get("green"));

                if(!equalRange)

                        return false;

                equalRange = false;

                equalRange = compareIntervals((int[][])params.get("blue"), (int[][])filter.params.get("blue"));

                if(!equalRange)

                        return false;

                return true;                

        }

}