| gvSIG desktop 1

/* gvSIG. Sistema de Informaci?n Geogrfica de la Generalitat Valenciana

 *

 * Copyright (C) 2006 Instituto de Desarrollo Regional and Generalitat Valenciana.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Iba?ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   Instituto de Desarrollo Regional (Universidad de Castilla La-Mancha)

 *   Campus Universitario s/n

 *   02071 Alabacete

 *   Spain

 *

 *   +34 967 599 200

 */

package org.gvsig.raster.grid.filter.convolution;

import org.gvsig.raster.buffer.RasterBuffer;

import org.gvsig.raster.dataset.IBuffer;

/**

 * Filtro de convolucion para Buffer de tipo Byte

 * @author Alejandro Mu?oz        <alejandro.munoz@uclm.es>

 * @author Diego Guerrero Sevilla  <diego.guerrero@uclm.es>

 * */

public class ConvolutionByteFilter extends ConvolutionFilter {

        public ConvolutionByteFilter(){

                super();

        }

        /**

         * @param Kernel a aplicar. En caso de que no se trate de un kernel definido en ConvolutionFilter, se puede pasar como

         * parametro el kernel se pretende aplicar.

         * **/

        public ConvolutionByteFilter(Kernel k){

                super();

                super.kernel=k;

        }

        public void pre(){

                super.pre();

                rasterResult = RasterBuffer.getBuffer(IBuffer.TYPE_BYTE, raster.getWidth(), raster.getHeight(), raster.getBandCount(), true);

        }

        /** Aplicacion del filtro para el pixel de la posicion line, col */

        public void process(int col, int line) {

                int lado = kernel.getLado();

                int semiLado = (lado - 1) >> 1;

                double ventana[][] = new double[lado][lado];

                double resultConvolution = 0;

                for (int band = 0; band < raster.getBandCount(); band++) {

/*

                        TODO: Mirar de cambiar el sistema de recorrido de pixels, para tener

                        metodos circulares, repetitivos o de descarte.

                        int posx = 0;

                        int posy = 0;

                        for (int j = -semiLado; j <= semiLado; j++) {

                                for (int i = -semiLado; i <= semiLado; i++) {

                                        posx = col + i;

                                        posy = line + j;

                                        if (posx < 0) posx=0;

                                        if (posy < 0) posy=0;

                                        if (posx >= width) posx=width - 1;

                                        if (posy >= height) posy=height - 1;

                                        ventana[i + semiLado][j + semiLado] = raster.getElemByte(posy, posx, band) & 0xff;

                                }

                        }

*/

                        if ((col - semiLado >= 0) && (line - semiLado >= 0) && (col + semiLado < width) && (line + semiLado < height)) {

                                for (int j = -semiLado; j <= semiLado; j++)

                                        for (int i = -semiLado; i <= semiLado; i++)

                                                ventana[i + semiLado][j + semiLado] = raster.getElemByte(line + j, col + i, band) & 0xff;

                                Kernel Kventana = new Kernel(ventana);

                                resultConvolution = kernel.convolution(Kventana);

                                if (resultConvolution > 255)

                                        resultConvolution = 255;

                                else

                                        if (resultConvolution < 0)

                                                resultConvolution = 0;

                                rasterResult.setElem(line, col, band, (byte) resultConvolution);

                        } else

                                rasterResult.setElem(line, col, band, (byte) raster.getElemByte(line, col, band));

                }

        }

        /**

         * @return  tipo de dato del buffer de entrada

         * */

        public int getInRasterDataType() {

                return RasterBuffer.TYPE_BYTE;

        }

        /**

         * @return tipo de dato del buffer de salida

         * */

        public int getOutRasterDataType() {

                return RasterBuffer.TYPE_BYTE;

        }

        /**

         * @return  buffer resultante tras aplicar el filtro

         * */

        public Object getResult(String name) {

                if (name.equals("raster"))

                        return this.rasterResult;

                return null;

        }

}