131 lines
3.3 KiB
C++
131 lines
3.3 KiB
C++
/*
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Copyright (C) 2011-2013 Paul Davis
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Author: Carl Hetherington <cth@carlh.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __ardour_canvas_colors_h__
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#define __ardour_canvas_colors_h__
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#include <cairomm/context.h>
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#include "canvas/visibility.h"
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#include "canvas/types.h"
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namespace ArdourCanvas
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{
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struct LIBCANVAS_API HSV;
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struct LIBCANVAS_API HSVA;
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extern LIBCANVAS_API Color change_alpha (Color, double alpha);
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extern LIBCANVAS_API Color hsva_to_color (double h, double s, double v, double a = 1.0);
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extern LIBCANVAS_API void color_to_hsva (Color color, double& h, double& s, double& v, double& a);
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extern LIBCANVAS_API void color_to_hsv (Color color, double& h, double& s, double& v);
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extern LIBCANVAS_API void color_to_rgba (Color, double& r, double& g, double& b, double& a);
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extern LIBCANVAS_API Color rgba_to_color (double r, double g, double b, double a);
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uint32_t LIBCANVAS_API contrasting_text_color (uint32_t c);
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struct LIBCANVAS_API HSV;
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class LIBCANVAS_API SVAModifier
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{
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public:
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enum Type {
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Add,
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Multiply,
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Assign
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};
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SVAModifier (std::string const &);
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SVAModifier (Type t, double ss, double vv, double aa) : type (t), _s (ss) , _v (vv) , _a (aa) {}
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SVAModifier () : type (Add), _s (0), _v (0), _a (0) {} /* no-op modifier */
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double s() const { return _s; }
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double v() const { return _v; }
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double a() const { return _a; }
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HSV operator () (HSV& hsv) const;
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std::string to_string () const;
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void from_string (std::string const &);
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private:
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Type type;
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double _s;
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double _v;
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double _a;
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};
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struct LIBCANVAS_API HSV
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{
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HSV ();
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HSV (double h, double s, double v, double a = 1.0);
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HSV (Color);
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HSV (const std::string&);
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double h;
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double s;
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double v;
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double a;
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std::string to_string() const;
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bool is_gray() const;
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Color color() const { return hsva_to_color (h,s, v, a); }
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operator Color() const { return color(); }
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HSV mod (SVAModifier const & svam);
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HSV operator+ (const HSV&) const;
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HSV operator- (const HSV&) const;
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HSV& operator=(Color);
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HSV& operator=(const std::string&);
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bool operator== (const HSV& other);
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double distance (const HSV& other) const;
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HSV delta (const HSV& other) const;
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HSV darker (double factor = 1.3) const { return shade (factor); }
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HSV lighter (double factor = 0.7) const { return shade (factor); }
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HSV shade (double factor) const;
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HSV mix (const HSV& other, double amt) const;
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HSV opposite() const;
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HSV complement() const { return opposite(); }
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HSV bw_text () const;
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HSV text() const;
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HSV selected () const;
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HSV outline() const;
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void print (std::ostream&) const;
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protected:
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void clamp ();
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};
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}
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std::ostream& operator<<(std::ostream& o, const ArdourCanvas::HSV& hsv);
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#endif /* __ardour_canvas_colors_h__ */
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