1// SuperTux
2// Copyright (C) 2006 Matthias Braun <matze@braunis.de>
3//
4// This program is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// This program is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU General Public License for more details.
13//
14// You should have received a copy of the GNU General Public License
15// along with this program. If not, see <http://www.gnu.org/licenses/>.
16
17#include "supertux/fadetoblack.hpp"
18
19#include "supertux/globals.hpp"
20#include "video/drawing_context.hpp"
21
22FadeToBlack::FadeToBlack(Direction direction, float fade_time, Color color) :
23 m_direction(direction),
24 m_fade_time(fade_time),
25 m_color(color),
26 m_accum_time(0)
27{
28}
29
30void
31FadeToBlack::update(float dt_sec)
32{
33 m_accum_time += dt_sec;
34 if (m_accum_time > m_fade_time)
35 m_accum_time = m_fade_time;
36}
37
38void
39FadeToBlack::draw(DrawingContext& context)
40{
41 Color col = m_color;
42 col.alpha = m_accum_time / m_fade_time;
43 if (m_direction != FADEOUT)
44 col.alpha = 1.0f - col.alpha;
45
46 // The colours are mixed directly in sRGB space, so change alpha for a more
47 // linear fading (it may only work correctly with black)
48 col.alpha = Color::remove_gamma(col.alpha);
49
50 context.color().draw_filled_rect(Rectf(0, 0,
51 static_cast<float>(context.get_width()),
52 static_cast<float>(context.get_height())),
53 col, LAYER_GUI + 1);
54}
55
56bool
57FadeToBlack::done() const
58{
59 return m_accum_time >= m_fade_time;
60}
61
62/* EOF */
63