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113 lines
4.3 KiB
C
113 lines
4.3 KiB
C
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtGui module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the 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 The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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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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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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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 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QRGB_H
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#define QRGB_H
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#include <QtGui/qtguiglobal.h>
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#include <QtCore/qprocessordetection.h>
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QT_BEGIN_NAMESPACE
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typedef unsigned int QRgb; // RGB triplet
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// non-namespaced Qt global variable
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const Q_DECL_UNUSED QRgb RGB_MASK = 0x00ffffff; // masks RGB values
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inline Q_DECL_CONSTEXPR int qRed(QRgb rgb) // get red part of RGB
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{ return ((rgb >> 16) & 0xff); }
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inline Q_DECL_CONSTEXPR int qGreen(QRgb rgb) // get green part of RGB
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{ return ((rgb >> 8) & 0xff); }
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inline Q_DECL_CONSTEXPR int qBlue(QRgb rgb) // get blue part of RGB
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{ return (rgb & 0xff); }
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inline Q_DECL_CONSTEXPR int qAlpha(QRgb rgb) // get alpha part of RGBA
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{ return rgb >> 24; }
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inline Q_DECL_CONSTEXPR QRgb qRgb(int r, int g, int b)// set RGB value
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{ return (0xffu << 24) | ((r & 0xffu) << 16) | ((g & 0xffu) << 8) | (b & 0xffu); }
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inline Q_DECL_CONSTEXPR QRgb qRgba(int r, int g, int b, int a)// set RGBA value
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{ return ((a & 0xffu) << 24) | ((r & 0xffu) << 16) | ((g & 0xffu) << 8) | (b & 0xffu); }
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inline Q_DECL_CONSTEXPR int qGray(int r, int g, int b)// convert R,G,B to gray 0..255
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{ return (r*11+g*16+b*5)/32; }
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inline Q_DECL_CONSTEXPR int qGray(QRgb rgb) // convert RGB to gray 0..255
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{ return qGray(qRed(rgb), qGreen(rgb), qBlue(rgb)); }
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inline Q_DECL_CONSTEXPR bool qIsGray(QRgb rgb)
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{ return qRed(rgb) == qGreen(rgb) && qRed(rgb) == qBlue(rgb); }
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inline Q_DECL_RELAXED_CONSTEXPR QRgb qPremultiply(QRgb x)
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{
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const uint a = qAlpha(x);
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uint t = (x & 0xff00ff) * a;
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t = (t + ((t >> 8) & 0xff00ff) + 0x800080) >> 8;
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t &= 0xff00ff;
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x = ((x >> 8) & 0xff) * a;
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x = (x + ((x >> 8) & 0xff) + 0x80);
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x &= 0xff00;
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return x | t | (a << 24);
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}
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Q_GUI_EXPORT extern const uint qt_inv_premul_factor[];
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inline QRgb qUnpremultiply(QRgb p)
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{
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const uint alpha = qAlpha(p);
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// Alpha 255 and 0 are the two most common values, which makes them beneficial to short-cut.
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if (alpha == 255)
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return p;
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if (alpha == 0)
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return 0;
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// (p*(0x00ff00ff/alpha)) >> 16 == (p*255)/alpha for all p and alpha <= 256.
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const uint invAlpha = qt_inv_premul_factor[alpha];
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// We add 0x8000 to get even rounding. The rounding also ensures that qPremultiply(qUnpremultiply(p)) == p for all p.
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return qRgba((qRed(p)*invAlpha + 0x8000)>>16, (qGreen(p)*invAlpha + 0x8000)>>16, (qBlue(p)*invAlpha + 0x8000)>>16, alpha);
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}
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QT_END_NAMESPACE
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#endif // QRGB_H
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