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228 lines
7.9 KiB
C++
228 lines
7.9 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://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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** $QT_BEGIN_LICENSE:LGPL21$
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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 http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://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 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QRGBA64_H
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#define QRGBA64_H
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#include <QtCore/qglobal.h>
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#include <QtCore/qprocessordetection.h>
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QT_BEGIN_NAMESPACE
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class QRgba64 {
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quint64 rgba;
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// Make sure that the representation always has the order: red green blue alpha, independent
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// of byte order. This way, vector operations that assume 4 16-bit values see the correct ones.
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enum {
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#if Q_BYTE_ORDER == Q_BIG_ENDIAN
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RedShift = 48,
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GreenShift = 32,
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BlueShift = 16,
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AlphaShift = 0
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#else // little endian:
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RedShift = 0,
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GreenShift = 16,
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BlueShift = 32,
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AlphaShift = 48
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#endif
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};
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// No constructors are allowed in C++98, since this needs to be usable in a union.
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// We however require one for constexprs in C++11/C++14
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#ifdef Q_COMPILER_CONSTEXPR
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explicit Q_ALWAYS_INLINE Q_DECL_CONSTEXPR QRgba64(quint64 c) : rgba(c) { }
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#endif
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public:
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#ifdef Q_COMPILER_CONSTEXPR
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Q_ALWAYS_INLINE Q_DECL_CONSTEXPR QRgba64() : rgba(0) { }
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#endif
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Q_DECL_CONSTEXPR static
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QRgba64 fromRgba64(quint64 c)
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{
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#ifdef Q_COMPILER_CONSTEXPR
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return QRgba64(c);
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#else
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QRgba64 rgba64;
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rgba64.rgba = c;
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return rgba64;
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#endif
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}
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Q_DECL_CONSTEXPR static
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QRgba64 fromRgba64(quint16 red, quint16 green, quint16 blue, quint16 alpha)
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{
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return fromRgba64(quint64(red) << RedShift
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| quint64(green) << GreenShift
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| quint64(blue) << BlueShift
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| quint64(alpha) << AlphaShift);
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}
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Q_DECL_RELAXED_CONSTEXPR static QRgba64 fromRgba(quint8 red, quint8 green, quint8 blue, quint8 alpha)
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{
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QRgba64 rgb64 = fromRgba64(red, green, blue, alpha);
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// Expand the range so that 0x00 maps to 0x0000 and 0xff maps to 0xffff.
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rgb64.rgba |= rgb64.rgba << 8;
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return rgb64;
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}
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Q_DECL_RELAXED_CONSTEXPR static
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QRgba64 fromArgb32(uint rgb)
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{
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return fromRgba(quint8(rgb >> 16), quint8(rgb >> 8), quint8(rgb), quint8(rgb >> 24));
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}
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Q_DECL_CONSTEXPR bool isOpaque() const
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{
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return (rgba & alphaMask()) == alphaMask();
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}
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Q_DECL_CONSTEXPR bool isTransparent() const
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{
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return (rgba & alphaMask()) == 0;
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}
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Q_DECL_CONSTEXPR quint16 red() const { return quint16(rgba >> RedShift); }
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Q_DECL_CONSTEXPR quint16 green() const { return quint16(rgba >> GreenShift); }
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Q_DECL_CONSTEXPR quint16 blue() const { return quint16(rgba >> BlueShift); }
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Q_DECL_CONSTEXPR quint16 alpha() const { return quint16(rgba >> AlphaShift); }
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void setRed(quint16 _red) { rgba = (rgba & ~(Q_UINT64_C(0xffff) << RedShift)) | (quint64(_red) << RedShift); }
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void setGreen(quint16 _green) { rgba = (rgba & ~(Q_UINT64_C(0xffff) << GreenShift)) | (quint64(_green) << GreenShift); }
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void setBlue(quint16 _blue) { rgba = (rgba & ~(Q_UINT64_C(0xffff) << BlueShift)) | (quint64(_blue) << BlueShift); }
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void setAlpha(quint16 _alpha) { rgba = (rgba & ~(Q_UINT64_C(0xffff) << AlphaShift)) | (quint64(_alpha) << AlphaShift); }
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Q_DECL_CONSTEXPR quint8 red8() const { return div_257(red()); }
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Q_DECL_CONSTEXPR quint8 green8() const { return div_257(green()); }
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Q_DECL_CONSTEXPR quint8 blue8() const { return div_257(blue()); }
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Q_DECL_CONSTEXPR quint8 alpha8() const { return div_257(alpha()); }
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Q_DECL_CONSTEXPR uint toArgb32() const
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{
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return uint((alpha8() << 24) | (red8() << 16) | (green8() << 8) | blue8());
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}
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Q_DECL_CONSTEXPR ushort toRgb16() const
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{
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return ushort((red() & 0xf800) | ((green() >> 10) << 5) | (blue() >> 11));
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}
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Q_DECL_RELAXED_CONSTEXPR QRgba64 premultiplied() const
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{
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const quint32 a = alpha();
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const quint16 r = div_65535(red() * a);
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const quint16 g = div_65535(green() * a);
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const quint16 b = div_65535(blue() * a);
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return fromRgba64(r, g, b, quint16(a));
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}
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Q_DECL_RELAXED_CONSTEXPR QRgba64 unpremultiplied() const
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{
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#if Q_PROCESSOR_WORDSIZE < 8
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return unpremultiplied_32bit();
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#else
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return unpremultiplied_64bit();
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#endif
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}
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Q_DECL_CONSTEXPR operator quint64() const
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{
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return rgba;
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}
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QRgba64 operator=(quint64 _rgba)
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{
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rgba = _rgba;
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return *this;
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}
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private:
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static Q_DECL_CONSTEXPR Q_ALWAYS_INLINE quint64 alphaMask() { return Q_UINT64_C(0xffff) << AlphaShift; }
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static Q_DECL_CONSTEXPR Q_ALWAYS_INLINE quint8 div_257_floor(uint x) { return quint8((x - (x >> 8)) >> 8); }
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static Q_DECL_CONSTEXPR Q_ALWAYS_INLINE quint8 div_257(quint16 x) { return div_257_floor(x + 128U); }
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static Q_DECL_CONSTEXPR Q_ALWAYS_INLINE quint16 div_65535(uint x) { return quint16((x + (x>>16) + 0x8000U) >> 16); }
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Q_DECL_RELAXED_CONSTEXPR Q_ALWAYS_INLINE QRgba64 unpremultiplied_32bit() const
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{
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if (isOpaque() || isTransparent())
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return *this;
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const quint32 a = alpha();
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const quint16 r = quint16((red() * 0xffff + a/2) / a);
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const quint16 g = quint16((green() * 0xffff + a/2) / a);
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const quint16 b = quint16((blue() * 0xffff + a/2) / a);
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return fromRgba64(r, g, b, quint16(a));
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}
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Q_DECL_RELAXED_CONSTEXPR Q_ALWAYS_INLINE QRgba64 unpremultiplied_64bit() const
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{
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if (isOpaque() || isTransparent())
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return *this;
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const quint64 a = alpha();
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const quint64 fa = (Q_UINT64_C(0xffff00008000) + a/2) / a;
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const quint16 r = quint16((red() * fa + 0x80000000) >> 32);
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const quint16 g = quint16((green() * fa + 0x80000000) >> 32);
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const quint16 b = quint16((blue() * fa + 0x80000000) >> 32);
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return fromRgba64(r, g, b, quint16(a));
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}
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};
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Q_DECLARE_TYPEINFO(QRgba64, Q_PRIMITIVE_TYPE);
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Q_DECL_CONSTEXPR inline QRgba64 qRgba64(quint16 r, quint16 g, quint16 b, quint16 a)
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{
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return QRgba64::fromRgba64(r, g, b, a);
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}
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Q_DECL_CONSTEXPR inline QRgba64 qRgba64(quint64 c)
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{
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return QRgba64::fromRgba64(c);
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}
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Q_DECL_RELAXED_CONSTEXPR inline QRgba64 qPremultiply(QRgba64 c)
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{
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return c.premultiplied();
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}
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Q_DECL_RELAXED_CONSTEXPR inline QRgba64 qUnpremultiply(QRgba64 c)
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{
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return c.unpremultiplied();
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}
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inline Q_DECL_CONSTEXPR uint qRed(QRgba64 rgb)
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{ return rgb.red8(); }
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inline Q_DECL_CONSTEXPR uint qGreen(QRgba64 rgb)
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{ return rgb.green8(); }
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inline Q_DECL_CONSTEXPR uint qBlue(QRgba64 rgb)
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{ return rgb.blue8(); }
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inline Q_DECL_CONSTEXPR uint qAlpha(QRgba64 rgb)
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{ return rgb.alpha8(); }
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QT_END_NAMESPACE
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#endif // QRGBA64_H
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