1 // color.cpp
2 //
3 // Copyright (C) 2001-2008, the Celestia Development Team
4 //
5 // This program is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU General Public License
7 // as published by the Free Software Foundation; either version 2
8 // of the License, or (at your option) any later version.
9
10 #include <cstdio>
11 #include <cstring>
12 #include <cctype>
13 #include "color.h"
14
15 using namespace std;
16
17
18 Color::ColorMap Color::x11Colors;
19
20 const Color Color::White = Color(1.0f, 1.0f, 1.0f);
21 const Color Color::Black = Color(0.0f,0.0f, 0.0f);
22
clamp(T x)23 template<class T> T clamp(T x)
24 {
25 if (x < 0)
26 return 0;
27 else if (x > 1)
28 return 1;
29 else
30 return x;
31 }
32
Color()33 Color::Color()
34 {
35 c[Red] = c[Green] = c[Blue] = 0;
36 c[Alpha] = 0xff;
37 }
38
39
Color(float r,float g,float b)40 Color::Color(float r, float g, float b)
41 {
42 c[Red] = (unsigned char) (clamp(r) * 255.99f);
43 c[Green] = (unsigned char) (clamp(g) * 255.99f);
44 c[Blue] = (unsigned char) (clamp(b) * 255.99f);
45 c[Alpha] = 0xff;
46 }
47
48
Color(float r,float g,float b,float a)49 Color::Color(float r, float g, float b, float a)
50 {
51 c[Red] = (unsigned char) (clamp(r) * 255.99f);
52 c[Green] = (unsigned char) (clamp(g) * 255.99f);
53 c[Blue] = (unsigned char) (clamp(b) * 255.99f);
54 c[Alpha] = (unsigned char) (clamp(a) * 255.99f);
55 }
56
57
Color(unsigned char r,unsigned char g,unsigned char b)58 Color::Color(unsigned char r, unsigned char g, unsigned char b)
59 {
60 c[Red] = r;
61 c[Green] = g;
62 c[Blue] = b;
63 c[Alpha] = 0xff;
64 }
65
66
Color(const Color & color,float alpha)67 Color::Color(const Color& color, float alpha)
68 {
69 *this = color;
70 c[Alpha] = (unsigned char) (clamp(alpha) * 255.99f);
71 }
72
73
74 /*! Parse a color string and return true if it was a valid color, otherwise
75 * false. Accetable inputs are HTML/X11 style #xxxxxx colors (where x is
76 * hexadecimal digit) or one of a list of named colors.
77 */
parse(const char * s,Color & c)78 bool Color::parse(const char* s, Color& c)
79 {
80 // Initialize the color dictionary if this is the first
81 // time Color::parse has been called.
82 if (x11Colors.empty())
83 {
84 buildX11ColorMap();
85 }
86
87 if (s[0] == '#')
88 {
89 s++;
90
91 int length = strlen(s);
92
93 // Verify that the string contains only hex digits
94 for (int i = 0; i < length; i++)
95 {
96 if (!isxdigit(s[i]))
97 return false;
98 }
99
100 unsigned int n;
101 sscanf(s, "%x", &n);
102 if (length == 3)
103 {
104 c = Color((unsigned char) ((n >> 8) * 17),
105 (unsigned char) (((n & 0x0f0) >> 4) * 17),
106 (unsigned char) ((n & 0x00f) * 17));
107 return true;
108 }
109 else if (length == 6)
110 {
111 c = Color((unsigned char) (n >> 16),
112 (unsigned char) ((n & 0x00ff00) >> 8),
113 (unsigned char) (n & 0x0000ff));
114 return true;
115 }
116 else
117 {
118 return false;
119 }
120 }
121 else
122 {
123 if (x11Colors.find(s) != x11Colors.end())
124 {
125 c = x11Colors.find(s)->second;
126 return true;
127 }
128 else
129 {
130 return false;
131 }
132 }
133 }
134
135
136 // X11 Colors STL map
buildX11ColorMap()137 void Color::buildX11ColorMap()
138 {
139 x11Colors["aliceblue"] = Color((unsigned char)240, (unsigned char)248, (unsigned char)255);
140 x11Colors["antiquewhite"] = Color((unsigned char)250, (unsigned char)235, (unsigned char)215);
141 x11Colors["aqua"] = Color((unsigned char)0, (unsigned char)255, (unsigned char)255);
142 x11Colors["aquamarine"] = Color((unsigned char)127, (unsigned char)255, (unsigned char)212);
143 x11Colors["azure"] = Color((unsigned char)240, (unsigned char)255, (unsigned char)255);
144 x11Colors["beige"] = Color((unsigned char)245, (unsigned char)245, (unsigned char)220);
145 x11Colors["bisque"] = Color((unsigned char)255, (unsigned char)228, (unsigned char)196);
146 x11Colors["black"] = Color((unsigned char)0, (unsigned char)0, (unsigned char)0);
147 x11Colors["blanchedalmond"] = Color((unsigned char)255, (unsigned char)235, (unsigned char)205);
148 x11Colors["blue"] = Color((unsigned char)0, (unsigned char)0, (unsigned char)255);
149 x11Colors["blueviolet"] = Color((unsigned char)138, (unsigned char)43, (unsigned char)226);
150 x11Colors["brown"] = Color((unsigned char)165, (unsigned char)42, (unsigned char)42);
151 x11Colors["burlywood"] = Color((unsigned char)222, (unsigned char)184, (unsigned char)135);
152 x11Colors["cadetblue"] = Color((unsigned char)95, (unsigned char)158, (unsigned char)160);
153 x11Colors["chartreuse"] = Color((unsigned char)127, (unsigned char)255, (unsigned char)0);
154 x11Colors["chocolate"] = Color((unsigned char)210, (unsigned char)105, (unsigned char)30);
155 x11Colors["coral"] = Color((unsigned char)255, (unsigned char)127, (unsigned char)80);
156 x11Colors["cornflowerblue"] = Color((unsigned char)100, (unsigned char)149, (unsigned char)237);
157 x11Colors["cornsilk"] = Color((unsigned char)255, (unsigned char)248, (unsigned char)220);
158 x11Colors["crimson"] = Color((unsigned char)220, (unsigned char)20, (unsigned char)60);
159 x11Colors["cyan"] = Color((unsigned char)0, (unsigned char)255, (unsigned char)255);
160 x11Colors["darkblue"] = Color((unsigned char)0, (unsigned char)0, (unsigned char)139);
161 x11Colors["darkcyan"] = Color((unsigned char)0, (unsigned char)139, (unsigned char)139);
162 x11Colors["darkgoldenrod"] = Color((unsigned char)184, (unsigned char)134, (unsigned char)11);
163 x11Colors["darkgray"] = Color((unsigned char)169, (unsigned char)169, (unsigned char)169);
164 x11Colors["darkgreen"] = Color((unsigned char)0, (unsigned char)100, (unsigned char)0);
165 x11Colors["darkkhaki"] = Color((unsigned char)189, (unsigned char)183, (unsigned char)107);
166 x11Colors["darkmagenta"] = Color((unsigned char)139, (unsigned char)0, (unsigned char)139);
167 x11Colors["darkolivegreen"] = Color((unsigned char)85, (unsigned char)107, (unsigned char)47);
168 x11Colors["darkorange"] = Color((unsigned char)255, (unsigned char)140, (unsigned char)0);
169 x11Colors["darkorchid"] = Color((unsigned char)153, (unsigned char)50, (unsigned char)204);
170 x11Colors["darkred"] = Color((unsigned char)139, (unsigned char)0, (unsigned char)0);
171 x11Colors["darksalmon"] = Color((unsigned char)233, (unsigned char)150, (unsigned char)122);
172 x11Colors["darkseagreen"] = Color((unsigned char)143, (unsigned char)188, (unsigned char)143);
173 x11Colors["darkslateblue"] = Color((unsigned char)72, (unsigned char)61, (unsigned char)139);
174 x11Colors["darkslategray"] = Color((unsigned char)47, (unsigned char)79, (unsigned char)79);
175 x11Colors["darkturquoise"] = Color((unsigned char)0, (unsigned char)206, (unsigned char)209);
176 x11Colors["darkviolet"] = Color((unsigned char)148, (unsigned char)0, (unsigned char)211);
177 x11Colors["deeppink"] = Color((unsigned char)255, (unsigned char)20, (unsigned char)147);
178 x11Colors["deepskyblue"] = Color((unsigned char)0, (unsigned char)191, (unsigned char)255);
179 x11Colors["dimgray"] = Color((unsigned char)105, (unsigned char)105, (unsigned char)105);
180 x11Colors["dodgerblue"] = Color((unsigned char)30, (unsigned char)144, (unsigned char)255);
181 x11Colors["firebrick"] = Color((unsigned char)178, (unsigned char)34, (unsigned char)34);
182 x11Colors["floralwhite"] = Color((unsigned char)255, (unsigned char)250, (unsigned char)240);
183 x11Colors["forestgreen"] = Color((unsigned char)34, (unsigned char)139, (unsigned char)34);
184 x11Colors["fuchsia"] = Color((unsigned char)255, (unsigned char)0, (unsigned char)255);
185 x11Colors["gainsboro"] = Color((unsigned char)220, (unsigned char)220, (unsigned char)220);
186 x11Colors["ghostwhite"] = Color((unsigned char)248, (unsigned char)248, (unsigned char)255);
187 x11Colors["gold"] = Color((unsigned char)255, (unsigned char)215, (unsigned char)0);
188 x11Colors["goldenrod"] = Color((unsigned char)218, (unsigned char)165, (unsigned char)32);
189 x11Colors["gray"] = Color((unsigned char)128, (unsigned char)128, (unsigned char)128);
190 x11Colors["green"] = Color((unsigned char)0, (unsigned char)128, (unsigned char)0);
191 x11Colors["greenyellow"] = Color((unsigned char)173, (unsigned char)255, (unsigned char)47);
192 x11Colors["honeydew"] = Color((unsigned char)240, (unsigned char)255, (unsigned char)240);
193 x11Colors["hotpink"] = Color((unsigned char)255, (unsigned char)105, (unsigned char)180);
194 x11Colors["indianred"] = Color((unsigned char)205, (unsigned char)92, (unsigned char)92);
195 x11Colors["indigo"] = Color((unsigned char)75, (unsigned char)0, (unsigned char)130);
196 x11Colors["ivory"] = Color((unsigned char)255, (unsigned char)255, (unsigned char)240);
197 x11Colors["khaki"] = Color((unsigned char)240, (unsigned char)230, (unsigned char)140);
198 x11Colors["lavender"] = Color((unsigned char)230, (unsigned char)230, (unsigned char)250);
199 x11Colors["lavenderblush"] = Color((unsigned char)255, (unsigned char)240, (unsigned char)245 );
200 x11Colors["lawngreen"] = Color((unsigned char)124, (unsigned char)252, (unsigned char)0);
201 x11Colors["lemonchiffon"] = Color((unsigned char)255, (unsigned char)250, (unsigned char)205);
202 x11Colors["lightblue"] = Color((unsigned char)173, (unsigned char)216, (unsigned char)230);
203 x11Colors["lightcoral"] = Color((unsigned char)240, (unsigned char)128, (unsigned char)128);
204 x11Colors["lightcyan"] = Color((unsigned char)224, (unsigned char)255, (unsigned char)255);
205 x11Colors["lightgoldenrodyellow"] = Color((unsigned char)250, (unsigned char)250, (unsigned char)210);
206 x11Colors["lightgreen"] = Color((unsigned char)144, (unsigned char)238, (unsigned char)144);
207 x11Colors["lightgrey"] = Color((unsigned char)211, (unsigned char)211, (unsigned char)211);
208 x11Colors["lightpink"] = Color((unsigned char)255, (unsigned char)182, (unsigned char)193);
209 x11Colors["lightsalmon"] = Color((unsigned char)255, (unsigned char)160, (unsigned char)122);
210 x11Colors["lightseagreen"] = Color((unsigned char)32, (unsigned char)178, (unsigned char)170);
211 x11Colors["lightskyblue"] = Color((unsigned char)135, (unsigned char)206, (unsigned char)250);
212 x11Colors["lightslategray"] = Color((unsigned char)119, (unsigned char)136, (unsigned char)153);
213 x11Colors["lightsteelblue"] = Color((unsigned char)176, (unsigned char)196, (unsigned char)222);
214 x11Colors["lightyellow"] = Color((unsigned char)255, (unsigned char)255, (unsigned char)224);
215 x11Colors["lime"] = Color((unsigned char)0, (unsigned char)255, (unsigned char)0);
216 x11Colors["limegreen"] = Color((unsigned char)50, (unsigned char)205, (unsigned char)50);
217 x11Colors["linen"] = Color((unsigned char)250, (unsigned char)240, (unsigned char)230);
218 x11Colors["magenta"] = Color((unsigned char)255, (unsigned char)0, (unsigned char)255);
219 x11Colors["maroon"] = Color((unsigned char)128, (unsigned char)0, (unsigned char)0);
220 x11Colors["mediumaquamarine"] = Color((unsigned char)102, (unsigned char)205, (unsigned char)170);
221 x11Colors["mediumblue"] = Color((unsigned char)0, (unsigned char)0, (unsigned char)205);
222 x11Colors["mediumorchid"] = Color((unsigned char)186, (unsigned char)85, (unsigned char)211);
223 x11Colors["mediumpurple"] = Color((unsigned char)147, (unsigned char)112, (unsigned char)219);
224 x11Colors["mediumseagreen"] = Color((unsigned char)60, (unsigned char)179, (unsigned char)113);
225 x11Colors["mediumslateblue"] = Color((unsigned char)123, (unsigned char)104, (unsigned char)238);
226 x11Colors["mediumspringgreen"] = Color((unsigned char)0, (unsigned char)250, (unsigned char)154);
227 x11Colors["mediumturquoise"] = Color((unsigned char)72, (unsigned char)209, (unsigned char)204);
228 x11Colors["mediumvioletred"] = Color((unsigned char)199, (unsigned char)21, (unsigned char)133);
229 x11Colors["midnightblue"] = Color((unsigned char)25, (unsigned char)25, (unsigned char)112);
230 x11Colors["mintcream"] = Color((unsigned char)245, (unsigned char)255, (unsigned char)250);
231 x11Colors["mistyrose"] = Color((unsigned char)255, (unsigned char)228, (unsigned char)225);
232 x11Colors["moccasin"] = Color((unsigned char)255, (unsigned char)228, (unsigned char)181);
233 x11Colors["navajowhite"] = Color((unsigned char)255, (unsigned char)222, (unsigned char)173);
234 x11Colors["navy"] = Color((unsigned char)0, (unsigned char)0, (unsigned char)128);
235 x11Colors["oldlace"] = Color((unsigned char)253, (unsigned char)245, (unsigned char)230);
236 x11Colors["olive"] = Color((unsigned char)128, (unsigned char)128, (unsigned char)0);
237 x11Colors["olivedrab"] = Color((unsigned char)107, (unsigned char)142, (unsigned char)35);
238 x11Colors["orange"] = Color((unsigned char)255, (unsigned char)165, (unsigned char)0);
239 x11Colors["orangered"] = Color((unsigned char)255, (unsigned char)69, (unsigned char)0);
240 x11Colors["orchid"] = Color((unsigned char)218, (unsigned char)112, (unsigned char)214);
241 x11Colors["palegoldenrod"] = Color((unsigned char)238, (unsigned char)232, (unsigned char)170);
242 x11Colors["palegreen"] = Color((unsigned char)152, (unsigned char)251, (unsigned char)152);
243 x11Colors["paleturquoise"] = Color((unsigned char)175, (unsigned char)238, (unsigned char)238);
244 x11Colors["palevioletred"] = Color((unsigned char)219, (unsigned char)112, (unsigned char)147);
245 x11Colors["papayawhip"] = Color((unsigned char)255, (unsigned char)239, (unsigned char)213);
246 x11Colors["peachpuff"] = Color((unsigned char)255, (unsigned char)218, (unsigned char)185);
247 x11Colors["peru"] = Color((unsigned char)205, (unsigned char)133, (unsigned char)63);
248 x11Colors["pink"] = Color((unsigned char)255, (unsigned char)192, (unsigned char)203);
249 x11Colors["plum"] = Color((unsigned char)221, (unsigned char)160, (unsigned char)221);
250 x11Colors["powderblue"] = Color((unsigned char)176, (unsigned char)224, (unsigned char)230);
251 x11Colors["purple"] = Color((unsigned char)128, (unsigned char)0, (unsigned char)128);
252 x11Colors["red"] = Color((unsigned char)255, (unsigned char)0, (unsigned char)0);
253 x11Colors["rosybrown"] = Color((unsigned char)188, (unsigned char)143, (unsigned char)143);
254 x11Colors["royalblue"] = Color((unsigned char)65, (unsigned char)105, (unsigned char)225);
255 x11Colors["saddlebrown"] = Color((unsigned char)139, (unsigned char)69, (unsigned char)19);
256 x11Colors["salmon"] = Color((unsigned char)250, (unsigned char)128, (unsigned char)114);
257 x11Colors["sandybrown"] = Color((unsigned char)244, (unsigned char)164, (unsigned char)96);
258 x11Colors["seagreen"] = Color((unsigned char)46, (unsigned char)139, (unsigned char)87);
259 x11Colors["seashell"] = Color((unsigned char)255, (unsigned char)245, (unsigned char)238);
260 x11Colors["sienna"] = Color((unsigned char)160, (unsigned char)82, (unsigned char)45);
261 x11Colors["silver"] = Color((unsigned char)192, (unsigned char)192, (unsigned char)192);
262 x11Colors["skyblue"] = Color((unsigned char)135, (unsigned char)206, (unsigned char)235);
263 x11Colors["slateblue"] = Color((unsigned char)106, (unsigned char)90, (unsigned char)205);
264 x11Colors["slategray"] = Color((unsigned char)112, (unsigned char)128, (unsigned char)144);
265 x11Colors["snow"] = Color((unsigned char)255, (unsigned char)250, (unsigned char)250);
266 x11Colors["springgreen"] = Color((unsigned char)0, (unsigned char)255, (unsigned char)127);
267 x11Colors["steelblue"] = Color((unsigned char)70, (unsigned char)130, (unsigned char)180);
268 x11Colors["tan"] = Color((unsigned char)210, (unsigned char)180, (unsigned char)140);
269 x11Colors["teal"] = Color((unsigned char)0, (unsigned char)128, (unsigned char)128);
270 x11Colors["thistle"] = Color((unsigned char)216, (unsigned char)191, (unsigned char)216);
271 x11Colors["tomato"] = Color((unsigned char)255, (unsigned char)99, (unsigned char)71);
272 x11Colors["turquoise"] = Color((unsigned char)64, (unsigned char)224, (unsigned char)208);
273 x11Colors["violet"] = Color((unsigned char)238, (unsigned char)130, (unsigned char)238);
274 x11Colors["wheat"] = Color((unsigned char)245, (unsigned char)222, (unsigned char)179);
275 x11Colors["white"] = Color((unsigned char)255, (unsigned char)255, (unsigned char)255);
276 x11Colors["whitesmoke"] = Color((unsigned char)245, (unsigned char)245, (unsigned char)245);
277 x11Colors["yellow"] = Color((unsigned char)255, (unsigned char)255, (unsigned char)0);
278 x11Colors["yellowgreen"] = Color((unsigned char)154, (unsigned char)205, (unsigned char)50);
279 }
280