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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 
hlsToRGB(float h, float l, float s)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 
hlsValue(float n1, float n2, float h)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      */
rgbToHLS(int rgb, float[] hls)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      */
adjustColor(Color color, float hFactor, float lFactor, float sFactor)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 
GTKColorType(String name)164     protected GTKColorType(String name) {
165         super(name);
166     }
167 }
168