/*

 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

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

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package org.netbeans.jemmy.image;

import java.awt.Point;

import java.awt.image.BufferedImage;

/**

 * Performs "rough" image search.

 *

 * @author Alexandre Iline (alexandre.iline@oracle.com)

 */

public class RoughImageFinder implements ImageFinder {

    double roughness = .0;

    int bigWidth, bigHeight;

    int[][] bigPixels;

    /**

     * Creates an instance allowing to find an image inside the one passed as

     * parameter with some "roughness".

     *

     * @param area - Image to search in.

     * @param roughness - Allowed

     */

    public RoughImageFinder(BufferedImage area, double roughness) {

        this.roughness = roughness;

        bigWidth = area.getWidth();

        bigHeight = area.getHeight();

        bigPixels = new int[bigWidth][bigHeight];

        for (int x = 0; x < bigWidth; x++) {

            for (int y = 0; y < bigHeight; y++) {

                bigPixels[x][y] = area.getRGB(x, y);

            }

        }

    }

    /**

     * Performs "rough" search.

     *

     * @param image an image to search.

     * @param index an ordinal image location index.

     * @return Point where number of unmatching pixels less or equal to      <code>image1.getWidth() * image1.getHeight() * roughness<code>

     */

    @Override

    public Point findImage(BufferedImage image, int index) {

        int smallWidth = image.getWidth();

        int smallHeight = image.getHeight();

        int[][] smallPixels = new int[smallWidth][smallHeight];

        for (int x = 0; x < smallWidth; x++) {

            for (int y = 0; y < smallHeight; y++) {

                smallPixels[x][y] = image.getRGB(x, y);

            }

        }

        double maxRoughPixels = (double) (smallWidth * smallHeight) * roughness;

        int count = 0;

        for (int X = 0; X <= bigWidth - smallWidth; X++) {

            for (int Y = 0; Y <= bigHeight - smallHeight; Y++) {

                int roughPixels = 0;

                for (int x = 0; x < smallWidth; x++) {

                    for (int y = 0; y < smallHeight; y++) {

                        if (smallPixels[x][y] != bigPixels[X + x][Y + y]) {

                            roughPixels++;

                            if (roughPixels > maxRoughPixels) {

                                break;

                            }

                        }

                    }

                    if (roughPixels > maxRoughPixels) {

                        break;

                    }

                }

                if (roughPixels <= maxRoughPixels) {

                    if (count == index) {

                        return new Point(X, Y);

                    }

                    count++;

                }

            }

        }

        return null;

    }

}