/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2020 Ziver Koc
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package zutil.image.filter;

import zutil.image.ImageFilterProcessor;
import zutil.image.RAWImageUtil;

import java.awt.image.BufferedImage;

public class ContrastBrightnessFilter extends ImageFilterProcessor{
    private double contrast;
    private double brightness;

    /**
     * Creates a ContrastBrightnessEffect object with the given values
     * @param img The image to apply the effect to
     */
    public ContrastBrightnessFilter(BufferedImage img) {
        this(img, 3, 1.2);
    }

    /**
     * Creates a ContrastBrightnessEffect object with the given values
     * @param img The image to apply the effect to
     * @param con The contrast to apply
     * @param brig The brightness to apply
     */
    public ContrastBrightnessFilter(BufferedImage img, double con, double brig) {
        super(img);
        contrast = con;
        brightness = brig;
    }

    @Override
    public int[][][] process(int[][][] data, int startX, int startY, int stopX, int stopY) {
        int mean = RAWImageUtil.getMeanValue(data);

        int[][][] output = RAWImageUtil.copyArray(data);

        RAWImageUtil.addMeanValue(output, startX, startY, stopX, stopY, mean*(-1));
        RAWImageUtil.scale(output, startX, startY, stopX, stopY, contrast);
        RAWImageUtil.addMeanValue(output, startX, startY, stopX, stopY, (int)(brightness*mean));

        RAWImageUtil.clip(output, startX, startY, stopX, stopY);

        return output;
    }

}
