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Diffstat (limited to 'src/gui/painting/qcolortrclut.cpp')
-rw-r--r-- | src/gui/painting/qcolortrclut.cpp | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/gui/painting/qcolortrclut.cpp b/src/gui/painting/qcolortrclut.cpp new file mode 100644 index 0000000000..268d7252b4 --- /dev/null +++ b/src/gui/painting/qcolortrclut.cpp @@ -0,0 +1,86 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qcolortrclut_p.h" +#include "qcolortransferfunction_p.h" +#include "qcolortransfertable_p.h" +#include <qmath.h> + +QT_BEGIN_NAMESPACE + +QColorTrcLut *QColorTrcLut::fromGamma(qreal gamma) +{ + QColorTrcLut *cp = new QColorTrcLut; + + for (int i = 0; i <= (255 * 16); ++i) { + cp->m_toLinear[i] = ushort(qRound(qPow(i / qreal(255 * 16), gamma) * (255 * 256))); + cp->m_fromLinear[i] = ushort(qRound(qPow(i / qreal(255 * 16), qreal(1) / gamma) * (255 * 256))); + } + + return cp; +} + +QColorTrcLut *QColorTrcLut::fromTransferFunction(const QColorTransferFunction &fun) +{ + QColorTrcLut *cp = new QColorTrcLut; + QColorTransferFunction inv = fun.inverted(); + + for (int i = 0; i <= (255 * 16); ++i) { + cp->m_toLinear[i] = ushort(qRound(fun.apply(i / qreal(255 * 16)) * (255 * 256))); + cp->m_fromLinear[i] = ushort(qRound(inv.apply(i / qreal(255 * 16)) * (255 * 256))); + } + + return cp; +} + +QColorTrcLut *QColorTrcLut::fromTransferTable(const QColorTransferTable &table) +{ + QColorTrcLut *cp = new QColorTrcLut; + + float minInverse = 0.0f; + for (int i = 0; i <= (255 * 16); ++i) { + cp->m_toLinear[i] = ushort(qBound(0, qRound(table.apply(i / qreal(255 * 16)) * (255 * 256)), 65280)); + minInverse = table.applyInverse(i / qreal(255 * 16), minInverse); + cp->m_fromLinear[i] = ushort(qBound(0, qRound(minInverse * (255 * 256)), 65280)); + } + + return cp; +} + +QT_END_NAMESPACE |