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 #include "canvas/visibility.h"
21 #include "canvas/types.h"
23 namespace ArdourCanvas {
25 extern LIBCANVAS_API void color_to_hsv (Color color, double& h, double& s, double& v);
26 extern LIBCANVAS_API Color hsv_to_color (double h, double s, double v, double a);
28 extern LIBCANVAS_API void color_to_rgba (Color, double& r, double& g, double& b, double& a);
29 extern LIBCANVAS_API Color rgba_to_color (double r, double g, double b, double a);
31 extern LIBCANVAS_API void set_source_rgba (Cairo::RefPtr<Cairo::Context>, Color);
33 Distance LIBCANVAS_API distance_to_segment_squared (Duple const & p, Duple const & p1, Duple const & p2, double& t, Duple& at);
35 uint32_t LIBCANVAS_API contrasting_text_color (uint32_t c);