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