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 __ardour_canvas_colors_h__
21 #define __ardour_canvas_colors_h__
23 #include <cairomm/context.h>
25 #include "canvas/visibility.h"
26 #include "canvas/types.h"
28 namespace ArdourCanvas
31 struct LIBCANVAS_API HSV;
32 struct LIBCANVAS_API HSVA;
34 extern LIBCANVAS_API Color change_alpha (Color, double alpha);
36 extern LIBCANVAS_API Color hsva_to_color (double h, double s, double v, double a = 1.0);
37 extern LIBCANVAS_API void color_to_hsva (Color color, double& h, double& s, double& v, double& a);
38 extern LIBCANVAS_API Color color_at_alpha (Color, double a);
39 extern LIBCANVAS_API void color_to_hsv (Color color, double& h, double& s, double& v);
40 extern LIBCANVAS_API void color_to_rgba (Color, double& r, double& g, double& b, double& a);
41 extern LIBCANVAS_API Color rgba_to_color (double r, double g, double b, double a);
43 uint32_t LIBCANVAS_API contrasting_text_color (uint32_t c);
45 struct LIBCANVAS_API HSV;
47 class LIBCANVAS_API SVAModifier
56 SVAModifier (std::string const &);
57 SVAModifier (Type t, double ss, double vv, double aa) : type (t), _s (ss) , _v (vv) , _a (aa) {}
58 SVAModifier () : type (Add), _s (0), _v (0), _a (0) {} /* no-op modifier */
60 double s() const { return _s; }
61 double v() const { return _v; }
62 double a() const { return _a; }
64 HSV operator () (HSV& hsv) const;
65 std::string to_string () const;
66 void from_string (std::string const &);
75 struct LIBCANVAS_API HSV
78 HSV (double h, double s, double v, double a = 1.0);
80 HSV (const std::string&);
87 std::string to_string() const;
90 Color color() const { return hsva_to_color (h,s, v, a); }
91 operator Color() const { return color(); }
93 HSV mod (SVAModifier const & svam);
95 HSV operator+ (const HSV&) const;
96 HSV operator- (const HSV&) const;
98 HSV& operator=(Color);
99 HSV& operator=(const std::string&);
101 bool operator== (const HSV& other);
103 double distance (const HSV& other) const;
104 HSV delta (const HSV& other) const;
106 HSV darker (double factor = 1.3) const { return shade (factor); }
107 HSV lighter (double factor = 0.7) const { return shade (factor); }
109 HSV shade (double factor) const;
110 HSV mix (const HSV& other, double amt) const;
112 HSV opposite() const;
113 HSV complement() const { return opposite(); }
115 HSV bw_text () const;
117 HSV selected () const;
120 void print (std::ostream&) const;
129 std::ostream& operator<<(std::ostream& o, const ArdourCanvas::HSV& hsv);
131 #endif /* __ardour_canvas_colors_h__ */