2 Copyright (C) 2011-2013 Paul Davis
3 Author: Carl Hetherington <cth@carlh.net>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef _GTKMM2EXT_COLORS_H_
21 #define _GTKMM2EXT_COLORS_H_
25 #include <cairomm/context.h>
27 #include "gtkmm2ext/visibility.h"
32 typedef uint32_t Color;
34 /* conventient way to use Gtkmm2ext::Color with libcairo */
35 extern LIBGTKMM2EXT_API void set_source_rgba (Cairo::RefPtr<Cairo::Context>, Gtkmm2ext::Color);
36 extern LIBGTKMM2EXT_API void set_source_rgb_a (Cairo::RefPtr<Cairo::Context>, Gtkmm2ext::Color, float alpha); //override the color's alpha
38 extern LIBGTKMM2EXT_API void set_source_rgba (cairo_t*, Gtkmm2ext::Color);
39 extern LIBGTKMM2EXT_API void set_source_rgb_a (cairo_t*, Gtkmm2ext::Color, float alpha); //override the color's alpha
42 struct LIBGTKMM2EXT_API HSV;
43 struct LIBGTKMM2EXT_API HSVA;
45 extern LIBGTKMM2EXT_API Color change_alpha (Color, double alpha);
47 extern LIBGTKMM2EXT_API Color hsva_to_color (double h, double s, double v, double a = 1.0);
48 extern LIBGTKMM2EXT_API void color_to_hsva (Color color, double& h, double& s, double& v, double& a);
49 extern LIBGTKMM2EXT_API Color color_at_alpha (Color, double a);
50 extern LIBGTKMM2EXT_API void color_to_hsv (Color color, double& h, double& s, double& v);
51 extern LIBGTKMM2EXT_API void color_to_rgba (Color, double& r, double& g, double& b, double& a);
52 extern LIBGTKMM2EXT_API Color rgba_to_color (double r, double g, double b, double a);
54 uint32_t LIBGTKMM2EXT_API contrasting_text_color (uint32_t c);
56 struct LIBGTKMM2EXT_API HSV;
58 class LIBGTKMM2EXT_API SVAModifier
67 SVAModifier (std::string const &);
68 SVAModifier (Type t, double ss, double vv, double aa) : type (t), _s (ss) , _v (vv) , _a (aa) {}
69 SVAModifier () : type (Add), _s (0), _v (0), _a (0) {} /* no-op modifier */
71 double s() const { return _s; }
72 double v() const { return _v; }
73 double a() const { return _a; }
75 HSV operator () (HSV& hsv) const;
76 std::string to_string () const;
77 void from_string (std::string const &);
86 struct LIBGTKMM2EXT_API HSV
89 HSV (double h, double s, double v, double a = 1.0);
97 std::string to_string() const;
100 Color color() const { return hsva_to_color (h,s, v, a); }
101 operator Color() const { return color(); }
103 HSV mod (SVAModifier const & svam);
105 HSV operator+ (const HSV&) const;
106 HSV operator- (const HSV&) const;
108 HSV& operator=(Color);
109 HSV& operator=(const std::string&);
111 bool operator== (const HSV& other);
113 double distance (const HSV& other) const;
114 HSV delta (const HSV& other) const;
116 HSV darker (double factor = 1.3) const { return shade (factor); }
117 HSV lighter (double factor = 0.7) const { return shade (factor); }
119 HSV shade (double factor) const;
120 HSV mix (const HSV& other, double amt) const;
122 HSV opposite() const;
123 HSV complement() const { return opposite(); }
125 HSV bw_text () const;
127 HSV selected () const;
130 void print (std::ostream&) const;
138 std::ostream& operator<<(std::ostream& o, const Gtkmm2ext::HSV& hsv);