1/*
2 Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
3 Copyright (C) 2012, 2013 Company 100, Inc.
4 Copyright (C) 2012, 2013 basysKom GmbH
5
6 This library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public
8 License as published by the Free Software Foundation; either
9 version 2 of the License, or (at your option) any later version.
10
11 This library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
15
16 You should have received a copy of the GNU Library General Public License
17 along with this library; see the file COPYING.LIB. If not, write to
18 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 Boston, MA 02110-1301, USA.
20*/
21
22#include "config.h"
23
24#include "TextureMapperFPSCounter.h"
25
26#include "TextureMapper.h"
27#include <wtf/text/WTFString.h>
28
29namespace WebCore {
30
31TextureMapperFPSCounter::TextureMapperFPSCounter()
32 : m_isShowingFPS(false)
33 , m_fpsInterval(0_s)
34 , m_lastFPS(0)
35 , m_frameCount(0)
36{
37 String showFPSEnvironment = getenv("WEBKIT_SHOW_FPS");
38 bool ok = false;
39 m_fpsInterval = Seconds(showFPSEnvironment.toDouble(&ok));
40 if (ok && m_fpsInterval) {
41 m_isShowingFPS = true;
42 m_fpsTimestamp = MonotonicTime::now();
43 }
44}
45
46void TextureMapperFPSCounter::updateFPSAndDisplay(TextureMapper& textureMapper, const FloatPoint& location, const TransformationMatrix& matrix)
47{
48 if (!m_isShowingFPS)
49 return;
50
51 m_frameCount++;
52 Seconds delta = MonotonicTime::now() - m_fpsTimestamp;
53 if (delta >= m_fpsInterval) {
54 m_lastFPS = int(m_frameCount / delta.seconds());
55 m_frameCount = 0;
56 m_fpsTimestamp += delta;
57 }
58
59 textureMapper.drawNumber(m_lastFPS, Color::black, location, matrix);
60}
61
62} // namespace WebCore
63