1 /* 2 * Copyright (C) 2017 Paul Davis <paul@linuxaudiosystems.com> 3 * Copyright (C) 2017 Robin Gareus <robin@gareus.org> 4 * 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. 9 * 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. 14 * 15 * You should have received a copy of the GNU General Public License along 16 * with this program; if not, write to the Free Software Foundation, Inc., 17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 18 */ 19 20 #ifndef _GTKMM2EXT_COLORS_H_ 21 #define _GTKMM2EXT_COLORS_H_ 22 23 #include<stdint.h> 24 25 #include <cairomm/context.h> 26 27 #include "gtkmm2ext/visibility.h" 28 29 namespace Gtkmm2ext 30 { 31 32 typedef uint32_t Color; 33 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 37 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 40 41 42 struct LIBGTKMM2EXT_API HSV; 43 struct LIBGTKMM2EXT_API HSVA; 44 45 extern LIBGTKMM2EXT_API Color change_alpha (Color, double alpha); 46 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); 53 54 uint32_t LIBGTKMM2EXT_API contrasting_text_color (uint32_t c); 55 56 struct LIBGTKMM2EXT_API HSV; 57 58 class LIBGTKMM2EXT_API SVAModifier 59 { 60 public: 61 enum Type { 62 Add, 63 Multiply, 64 Assign 65 }; 66 67 SVAModifier (std::string const &); SVAModifier(Type t,double ss,double vv,double aa)68 SVAModifier (Type t, double ss, double vv, double aa) : type (t), _s (ss) , _v (vv) , _a (aa) {} SVAModifier()69 SVAModifier () : type (Add), _s (0), _v (0), _a (0) {} /* no-op modifier */ 70 s()71 double s() const { return _s; } v()72 double v() const { return _v; } a()73 double a() const { return _a; } 74 75 HSV operator () (HSV& hsv) const; 76 std::string to_string () const; 77 void from_string (std::string const &); 78 79 private: 80 Type type; 81 double _s; 82 double _v; 83 double _a; 84 }; 85 86 struct LIBGTKMM2EXT_API HSV 87 { 88 HSV (); 89 HSV (double h, double s, double v, double a = 1.0); 90 HSV (Color); 91 92 double h; 93 double s; 94 double v; 95 double a; 96 97 std::string to_string() const; 98 bool is_gray() const; 99 colorHSV100 Color color() const { return hsva_to_color (h,s, v, a); } ColorHSV101 operator Color() const { return color(); } 102 103 HSV mod (SVAModifier const & svam); 104 105 HSV operator+ (const HSV&) const; 106 HSV operator- (const HSV&) const; 107 108 HSV& operator=(Color); 109 HSV& operator=(const std::string&); 110 111 bool operator== (const HSV& other); 112 113 double distance (const HSV& other) const; 114 HSV delta (const HSV& other) const; 115 116 HSV darker (double factor = 1.3) const { return shade (factor); } 117 HSV lighter (double factor = 0.7) const { return shade (factor); } 118 119 HSV shade (double factor) const; 120 HSV mix (const HSV& other, double amt) const; 121 122 HSV opposite() const; complementHSV123 HSV complement() const { return opposite(); } 124 125 HSV bw_text () const; 126 HSV text() const; 127 HSV selected () const; 128 HSV outline() const; 129 130 void print (std::ostream&) const; 131 132 protected: 133 void clamp (); 134 }; 135 136 } /* namespace */ 137 138 std::ostream& operator<<(std::ostream& o, const Gtkmm2ext::HSV& hsv); 139 140 #endif 141