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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 hsv_to_color (double h, double s, double v, double a = 1.0);
extern LIBCANVAS_API Color hsv_to_color (const HSV&, double a = 1.0);
extern LIBCANVAS_API Color hsva_to_color (const HSVA&);
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
{
HSV ();
HSV (double h, double s, double v);
HSV (Color);
virtual ~HSV() {}
double h;
double s;
double v;
bool is_gray() const { return s == 0; }
operator Color() const { return hsv_to_color (*this); }
HSV operator+ (const HSV&) const;
HSV operator- (const HSV&) const;
HSV operator* (double) 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;
void print (std::ostream&) const;
protected:
virtual void clamp();
};
struct LIBCANVAS_API HSVA : public HSV
{
HSVA ();
HSVA (double h, double s, double v, double a);
HSVA (Color);
double a;
operator Color() const { return hsva_to_color (*this); }
HSVA operator+ (const HSVA&) const;
HSVA operator- (const HSVA&) const;
void print (std::ostream&) const;
protected:
void clamp ();
};
}
std::ostream& operator<<(std::ostream& o, const ArdourCanvas::HSV& hsv);
std::ostream& operator<<(std::ostream& o, const ArdourCanvas::HSVA& hsva);
#endif /* __ardour_canvas_colors_h__ */
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