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/****************************************************************************
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the QtCore module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Nokia.
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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** In addition, as a special exception, Nokia gives you certain
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** additional rights. These rights are described in the Nokia Qt LGPL
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** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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** If you are unsure which license is appropriate for your use, please
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** contact the sales department at http://www.qtsoftware.com/contact.
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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** $QT_END_LICENSE$
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****************************************************************************/
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#define QT_SINE_TABLE_SIZE 256
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extern Q_CORE_EXPORT const qreal qt_sine_table[QT_SINE_TABLE_SIZE];
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inline int qCeil(qreal v)
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#ifdef QT_USE_MATH_H_FLOATS
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if (sizeof(qreal) == sizeof(float))
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return int(ceilf(float(v)));
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return int(ceil(v));
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#ifdef QT_USE_MATH_H_FLOATS
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if (sizeof(qreal) == sizeof(float))
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return powf(float(x), float(y));
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return pow(x, y);
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#define M_PI (3.14159265358979323846)
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inline qreal qFastSin(qreal x)
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int si = int(x * (0.5 * QT_SINE_TABLE_SIZE / M_PI)); // Would be more accurate with qRound, but slower.
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qreal d = x - si * (2.0 * M_PI / QT_SINE_TABLE_SIZE);
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int ci = si + QT_SINE_TABLE_SIZE / 4;
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si &= QT_SINE_TABLE_SIZE - 1;
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ci &= QT_SINE_TABLE_SIZE - 1;
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return qt_sine_table[si] + (qt_sine_table[ci] - 0.5 * qt_sine_table[si] * d) * d;
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inline qreal qFastCos(qreal x)
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int ci = int(x * (0.5 * QT_SINE_TABLE_SIZE / M_PI)); // Would be more accurate with qRound, but slower.
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qreal d = x - ci * (2.0 * M_PI / QT_SINE_TABLE_SIZE);
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int si = ci + QT_SINE_TABLE_SIZE / 4;
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si &= QT_SINE_TABLE_SIZE - 1;
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ci &= QT_SINE_TABLE_SIZE - 1;
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return qt_sine_table[si] - (qt_sine_table[ci] + 0.5 * qt_sine_table[si] * d) * d;