1/*
2 * Copyright (c) 2002, 2017, 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 */
25package com.sun.java.swing.plaf.gtk;
26
27import javax.swing.plaf.synth.ColorType;
28import java.awt.Color;
29import javax.swing.plaf.ColorUIResource;
30
31/**
32 * @author Scott Violet
33 */
34public class GTKColorType extends ColorType {
35    // GTK allows you to specify the foreground and background in a
36    // gtkrc, the rest (dark, mid, light) are calculated from these
37    // values.
38    public static final ColorType LIGHT = new GTKColorType("Light");
39    public static final ColorType DARK = new GTKColorType("Dark");
40    public static final ColorType MID = new GTKColorType("Mid");
41    public static final ColorType BLACK = new GTKColorType("Black");
42    public static final ColorType WHITE = new GTKColorType("White");
43
44    public static final int MAX_COUNT;
45
46    private static final float[] HLS_COLORS = new float[3];
47    private static final Object HLS_COLOR_LOCK = new Object();
48
49    static {
50        MAX_COUNT = WHITE.getID() + 1;
51    }
52
53    private static int hlsToRGB(float h, float l, float s) {
54        float m2 = (l <= .5f) ? (l * (1 + s)) : (l + s - l * s);
55        float m1 = 2.0f * l - m2;
56        float r, g, b;
57
58        if (s == 0.0) {
59            if (h == 0.0) {
60                r = g = b = l;
61            }
62            else {
63                r = g = b = 0;
64            }
65        }
66        else {
67            r = hlsValue(m1, m2, h + 120);
68            g = hlsValue(m1, m2, h);
69            b = hlsValue(m1, m2, h - 120);
70        }
71        return (((int)(r * 255)) << 16) | (((int)(g * 255.0)) << 8) |
72               ((int)(b * 255));
73    }
74
75    private static float hlsValue(float n1, float n2, float h) {
76        if (h > 360) {
77            h -= 360;
78        }
79        else if (h < 0) {
80            h += 360;
81        }
82        if (h < 60) {
83            return n1 + (n2 - n1) * h / 60.0f;
84        }
85        else if (h < 180) {
86            return n2;
87        }
88        else if (h < 240) {
89            return n1 + (n2 - n1) * (240.0f - h) / 60.0f;
90        }
91        return n1;
92    }
93
94    /**
95     * Converts from RGB color space to HLS colorspace.
96     */
97    private static float[] rgbToHLS(int rgb, float[] hls) {
98        float r = ((rgb & 0xFF0000) >> 16) / 255.0f;
99        float g = ((rgb & 0xFF00) >> 8) / 255.0f;
100        float b = (rgb & 0xFF) / 255.0f;
101
102        /* calculate lightness */
103        float max = Math.max(Math.max(r, g), b);
104        float min = Math.min(Math.min(r, g), b);
105        float l = (max + min) / 2.0f;
106        float s = 0;
107        float h = 0;
108
109        if (max != min) {
110            float delta = max - min;
111            s = (l <= .5f) ? (delta / (max + min)) : (delta / (2.0f - max -min));
112            if (r == max) {
113                h = (g - b) / delta;
114            }
115            else if (g == max) {
116                h = 2.0f + (b - r) / delta;
117            }
118            else {
119                h = 4.0f + (r - g) / delta;
120            }
121            h *= 60.0f;
122            if (h < 0) {
123                h += 360.0f;
124            }
125        }
126        if (hls == null) {
127            hls = new float[3];
128        }
129        hls[0] = h;
130        hls[1] = l;
131        hls[2] = s;
132        return hls;
133    }
134
135    /**
136     * Creates and returns a new color derived from the passed in color.
137     * The transformation is done in the HLS color space using the specified
138     * arguments to scale.
139     *
140     * @param color Color to alter
141     * @param hFactor Amount to scale the hue
142     * @param lFactor Amount to scale the lightness
143     * @param sFactor Amount to sacle saturation
144     * @return newly created color
145     */
146    static Color adjustColor(Color color, float hFactor, float lFactor,
147                             float sFactor) {
148        float h;
149        float l;
150        float s;
151
152        synchronized(HLS_COLOR_LOCK) {
153            float[] hls = rgbToHLS(color.getRGB(), HLS_COLORS);
154            h = hls[0];
155            l = hls[1];
156            s = hls[2];
157        }
158        h = Math.min(360, hFactor * h);
159        l = Math.min(1, lFactor * l);
160        s = Math.min(1, sFactor * s);
161        return new ColorUIResource(hlsToRGB(h, l, s));
162    }
163
164    protected GTKColorType(String name) {
165        super(name);
166    }
167}
168