1 /*
2 * Copyright (c) 2002, 2003, 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 package com.sun.java.swing.plaf.gtk;
26
27 import javax.swing.plaf.synth.ColorType;
28 import java.awt.Color;
29 import javax.swing.plaf.ColorUIResource;
30
31 /**
32 * @author Scott Violet
33 */
34 public 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 hFactory Amount to scale the hue
142 * @param lFactor Amount to scale the lightness
143 * @param sFactory 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 }