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Diffstat (limited to 'src/gui/painting/qrgba64.h')
| -rw-r--r-- | src/gui/painting/qrgba64.h | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/src/gui/painting/qrgba64.h b/src/gui/painting/qrgba64.h new file mode 100644 index 0000000000..51ce4ab10d --- /dev/null +++ b/src/gui/painting/qrgba64.h @@ -0,0 +1,204 @@ +/**************************************************************************** +** +** Copyright (C) 2015 The Qt Company Ltd. +** Contact: http://www.qt.io/licensing/ +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL21$ +** 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 http://www.qt.io/terms-conditions. For further +** information use the contact form at http://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 2.1 or version 3 as published by the Free +** Software Foundation and appearing in the file LICENSE.LGPLv21 and +** LICENSE.LGPLv3 included in the packaging of this file. Please review the +** following information to ensure the GNU Lesser General Public License +** requirements will be met: https://www.gnu.org/licenses/lgpl.html and +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** As a special exception, The Qt Company gives you certain additional +** rights. These rights are described in The Qt Company LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QRGBA64_H +#define QRGBA64_H + +#include <QtCore/qglobal.h> +#include <QtCore/qprocessordetection.h> + +QT_BEGIN_NAMESPACE + +class QRgba64 { + union { + struct { + quint16 red; + quint16 green; + quint16 blue; + quint16 alpha; + } c; + quint64 rgba; + }; +public: + // No constructors are allowed, since this needs to be usable in a union in no-c++11 mode. + // When c++11 is mandatory, we can add all but a copy constructor. + Q_DECL_RELAXED_CONSTEXPR static QRgba64 fromRgba64(quint16 red, quint16 green, quint16 blue, quint16 alpha) + { + QRgba64 rgba64 +#ifdef Q_COMPILER_UNIFORM_INIT + = {} +#endif + ; + + rgba64.c.red = red; + rgba64.c.green = green; + rgba64.c.blue = blue; + rgba64.c.alpha = alpha; + return rgba64; + } + Q_DECL_RELAXED_CONSTEXPR static QRgba64 fromRgba64(quint64 c) + { + QRgba64 rgba64 +#ifdef Q_COMPILER_UNIFORM_INIT + = {} +#endif + ; + rgba64.rgba = c; + return rgba64; + } + Q_DECL_RELAXED_CONSTEXPR static QRgba64 fromRgba(quint8 red, quint8 green, quint8 blue, quint8 alpha) + { + QRgba64 rgb64 = fromRgba64(red, green, blue, alpha); + // Expand the range so that 0x00 maps to 0x0000 and 0xff maps to 0xffff. + rgb64.rgba |= rgb64.rgba << 8; + return rgb64; + } + Q_DECL_RELAXED_CONSTEXPR static QRgba64 fromArgb32(uint rgb) + { + return fromRgba(rgb >> 16, rgb >> 8, rgb, rgb >> 24); + } + + Q_DECL_CONSTEXPR bool isOpaque() const { return c.alpha == 0xffff; } + Q_DECL_CONSTEXPR bool isTransparent() const { return c.alpha == 0; } + + Q_DECL_CONSTEXPR quint16 red() const { return c.red; } + Q_DECL_CONSTEXPR quint16 green() const { return c.green; } + Q_DECL_CONSTEXPR quint16 blue() const { return c.blue; } + Q_DECL_CONSTEXPR quint16 alpha() const { return c.alpha; } + void setRed(quint16 _red) { c.red = _red; } + void setGreen(quint16 _green) { c.green = _green; } + void setBlue(quint16 _blue) { c.blue = _blue; } + void setAlpha(quint16 _alpha) { c.alpha = _alpha; } + + Q_DECL_CONSTEXPR quint8 red8() const { return div_257(c.red); } + Q_DECL_CONSTEXPR quint8 green8() const { return div_257(c.green); } + Q_DECL_CONSTEXPR quint8 blue8() const { return div_257(c.blue); } + Q_DECL_CONSTEXPR quint8 alpha8() const { return div_257(c.alpha); } + Q_DECL_CONSTEXPR uint toArgb32() const + { + return (alpha8() << 24) | (red8() << 16) | (green8() << 8) | blue8(); + } + Q_DECL_CONSTEXPR ushort toRgb16() const + { + return (c.red & 0xf800) | ((c.green >> 10) << 5) | (c.blue >> 11); + } + + Q_DECL_RELAXED_CONSTEXPR QRgba64 premultiplied() const + { + const quint32 a = c.alpha; + const quint16 r = div_65535(c.red * a); + const quint16 g = div_65535(c.green * a); + const quint16 b = div_65535(c.blue * a); + return fromRgba64(r, g, b, a); + } + + Q_DECL_RELAXED_CONSTEXPR QRgba64 unpremultiplied() const + { +#if Q_PROCESSOR_WORDSIZE < 8 + return unpremultiplied_32bit(); +#else + return unpremultiplied_64bit(); +#endif + } + + Q_DECL_CONSTEXPR operator quint64() const + { + return rgba; + } + + QRgba64 operator=(quint64 _rgba) + { + rgba = _rgba; + return *this; + } + +private: + static Q_DECL_CONSTEXPR uint div_257_floor(uint x) { return (x - (x >> 8)) >> 8; } + static Q_DECL_CONSTEXPR uint div_257(uint x) { return div_257_floor(x + 128); } + static Q_DECL_CONSTEXPR uint div_65535(uint x) { return (x + (x>>16) + 0x8000U) >> 16; } + Q_DECL_RELAXED_CONSTEXPR QRgba64 unpremultiplied_32bit() const + { + if (c.alpha == 0xffff || c.alpha == 0) + return *this; + const quint16 r = (quint32(c.red) * 0xffff + c.alpha/2) / c.alpha; + const quint16 g = (quint32(c.green) * 0xffff + c.alpha/2) / c.alpha; + const quint16 b = (quint32(c.blue) * 0xffff + c.alpha/2) / c.alpha; + return fromRgba64(r, g, b, c.alpha); + } + Q_DECL_RELAXED_CONSTEXPR QRgba64 unpremultiplied_64bit() const + { + if (c.alpha == 0xffff || c.alpha == 0) + return *this; + const quint64 fa = (Q_UINT64_C(0xffff00008000) + c.alpha/2) / c.alpha; + const quint16 r = (c.red * fa + 0x80000000) >> 32; + const quint16 g = (c.green * fa + 0x80000000) >> 32; + const quint16 b = (c.blue * fa + 0x80000000) >> 32; + return fromRgba64(r, g, b, c.alpha); + } +}; + +Q_DECL_RELAXED_CONSTEXPR inline QRgba64 qRgba64(quint16 r, quint16 g, quint16 b, quint16 a) +{ + return QRgba64::fromRgba64(r, g, b, a); +} + +Q_DECL_RELAXED_CONSTEXPR inline QRgba64 qRgba64(quint64 c) +{ + return QRgba64::fromRgba64(c); +} + +Q_DECL_RELAXED_CONSTEXPR inline QRgba64 qPremultiply(QRgba64 c) +{ + return c.premultiplied(); +} + +Q_DECL_RELAXED_CONSTEXPR inline QRgba64 qUnpremultiply(QRgba64 c) +{ + return c.unpremultiplied(); +} + +inline Q_DECL_CONSTEXPR uint qRed(QRgba64 rgb) +{ return rgb.red8(); } + +inline Q_DECL_CONSTEXPR uint qGreen(QRgba64 rgb) +{ return rgb.green8(); } + +inline Q_DECL_CONSTEXPR uint qBlue(QRgba64 rgb) +{ return rgb.blue8(); } + +inline Q_DECL_CONSTEXPR uint qAlpha(QRgba64 rgb) +{ return rgb.alpha8(); } + +QT_END_NAMESPACE + +#endif // QRGBA64_H |