ColorSpaceCMYK.java

/*
 * Copyright 2006-2017 ICEsoft Technologies Canada Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an "AS
 * IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.icepdf.core.pobjects.graphics;

import java.awt.color.ColorSpace;

/**
 * @author Mark Collette
 * @since 2.0
 */
@SuppressWarnings("serial")
public class ColorSpaceCMYK extends ColorSpace {
    private static final String[] NAMES = new String[]{"Cyan", "Magenta", "Yellow", "Black"};
    private static final ColorSpace COLOR_SPACE_sRGB = ColorSpace.getInstance(ColorSpace.CS_sRGB);

    public ColorSpaceCMYK() {
        super(TYPE_CMYK, 4);
    }

    public int getNumComponents() {
        return 4;
    }

    public String getName(int index) {
        return NAMES[index];
    }

    public int getType() {
        return TYPE_CMYK;
    }

    public boolean isCS_sRGB() {
        return false;
    }

    public float[] fromRGB(float[] rgbValues) {
        float c = 1.0f - rgbValues[0];
        float m = 1.0f - rgbValues[1];
        float y = 1.0f - rgbValues[2];
        float k = Math.min(c, Math.min(m, y));
        float km = Math.max(c, Math.max(m, y));
        if (km > k)
            k = k * k * k / (km * km);

        c -= k;
        m -= k;
        y -= k;

        float[] cmykValues = new float[4];
        cmykValues[0] = c;
        cmykValues[1] = m;
        cmykValues[2] = y;
        cmykValues[3] = k;
        return cmykValues;
    }

    public float[] toRGB(float[] cmykValues) {
//System.out.println("CMYK: " + cmykValues[0] + "  " + cmykValues[1] + "  " + cmykValues[2] + "  " + cmykValues[3]);
        /*
        float c = 1.0f - cmykValues[0];
        float m = 1.0f - cmykValues[1];
        float y = 1.0f - cmykValues[2];
        float k = cmykValues[3];

        c -= k;
        m -= k;
        y -= k;

        if( c < 0.0f )
            c = 0.0f;
        if( m < 0.0f )
            m = 0.0f;
        if( y < 0.0f )
            y = 0.0f;
        */

        float c = cmykValues[0];
        float m = cmykValues[1];
        float y = cmykValues[2];
        float k = cmykValues[3];

        c += k;
        m += k;
        y += k;

        if (c < 0.0f)
            c = 0.0f;
        else if (c > 1.0f)
            c = 1.0f;
        if (m < 0.0f)
            m = 0.0f;
        else if (m > 1.0f)
            m = 1.0f;
        if (y < 0.0f)
            y = 0.0f;
        else if (y > 1.0f)
            y = 1.0f;

        c = 1.0f - c;
        m = 1.0f - m;
        y = 1.0f - y;

        float[] rgbValues = new float[4];
        rgbValues[0] = c;
        rgbValues[1] = m;
        rgbValues[2] = y;
        return rgbValues;
    }

    private float[] _rgbValues = new float[4];

    public float[] fromCIEXYZ(float[] colorvalue) {
        return fromRGB(COLOR_SPACE_sRGB.fromCIEXYZ(colorvalue));
    }

    public float[] toCIEXYZ(float[] colorvalue) {
        return COLOR_SPACE_sRGB.toCIEXYZ(toRGB(colorvalue));
    }
}