1/*
2 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package javax.swing.colorchooser;
27
28final class ColorModelCMYK extends ColorModel {
29
30    ColorModelCMYK() {
31        super("cmyk", "Cyan", "Magenta", "Yellow", "Black", "Alpha"); // NON-NLS: components
32    }
33
34    @Override
35    void setColor(int color, float[] space) {
36        super.setColor(color, space);
37        space[4] = space[3];
38        RGBtoCMYK(space, space);
39    }
40
41    @Override
42    int getColor(float[] space) {
43        CMYKtoRGB(space, space);
44        space[3] = space[4];
45        return super.getColor(space);
46    }
47
48    /**
49     * Converts CMYK components of a color to a set of RGB components.
50     *
51     * @param cmyk  a float array with length equal to
52     *              the number of CMYK components
53     * @param rgb   a float array with length of at least 3
54     *              that contains RGB components of a color
55     * @return a float array that contains RGB components
56     */
57    private static float[] CMYKtoRGB(float[] cmyk, float[] rgb) {
58        if (rgb == null) {
59            rgb = new float[3];
60        }
61        rgb[0] = 1.0f + cmyk[0] * cmyk[3] - cmyk[3] - cmyk[0];
62        rgb[1] = 1.0f + cmyk[1] * cmyk[3] - cmyk[3] - cmyk[1];
63        rgb[2] = 1.0f + cmyk[2] * cmyk[3] - cmyk[3] - cmyk[2];
64        return rgb;
65    }
66
67    /**
68     * Converts RGB components of a color to a set of CMYK components.
69     *
70     * @param rgb   a float array with length of at least 3
71     *              that contains RGB components of a color
72     * @param cmyk  a float array with length equal to
73     *              the number of CMYK components
74     * @return a float array that contains CMYK components
75     */
76    private static float[] RGBtoCMYK(float[] rgb, float[] cmyk) {
77        if (cmyk == null) {
78            cmyk = new float[4];
79        }
80        float max = ColorModelHSL.max(rgb[0], rgb[1], rgb[2]);
81        if (max > 0.0f) {
82            cmyk[0] = 1.0f - rgb[0] / max;
83            cmyk[1] = 1.0f - rgb[1] / max;
84            cmyk[2] = 1.0f - rgb[2] / max;
85        }
86        else {
87            cmyk[0] = 0.0f;
88            cmyk[1] = 0.0f;
89            cmyk[2] = 0.0f;
90        }
91        cmyk[3] = 1.0f - max;
92        return cmyk;
93    }
94}
95