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/****************************************************************************
**
** Copyright (C) 2021 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QRGBAFLOAT_H
#define QRGBAFLOAT_H
#include <QtGui/qtguiglobal.h>
#include <QtCore/qfloat16.h>
#include <algorithm>
#include <cmath>
#include <type_traits>
QT_BEGIN_NAMESPACE
template<typename F>
class alignas(sizeof(F) * 4) QRgbaFloat
{
static_assert(std::is_same<F, qfloat16>::value || std::is_same<F, float>::value);
public:
using Type = F;
using FastType = float;
F r;
F g;
F b;
F a;
static constexpr
QRgbaFloat fromRgba64(quint16 red, quint16 green, quint16 blue, quint16 alpha)
{
return QRgbaFloat{
red * (1.0f / 65535.0f),
green * (1.0f / 65535.0f),
blue * (1.0f / 65535.0f),
alpha * (1.0f / 65535.0f) };
}
static constexpr
QRgbaFloat fromRgba(quint8 red, quint8 green, quint8 blue, quint8 alpha)
{
return QRgbaFloat{
red * (1.0f / 255.0f),
green * (1.0f / 255.0f),
blue * (1.0f / 255.0f),
alpha * (1.0f / 255.0f) };
}
static constexpr
QRgbaFloat fromArgb32(uint rgb)
{
return fromRgba(quint8(rgb >> 16), quint8(rgb >> 8), quint8(rgb), quint8(rgb >> 24));
}
constexpr bool isOpaque() const { return a >= 1.0f; }
constexpr bool isTransparent() const { return a <= 0.0f; }
constexpr FastType red() const { return r; }
constexpr FastType green() const { return g; }
constexpr FastType blue() const { return b; }
constexpr FastType alpha() const { return a; }
void setRed(FastType _red) { r = _red; }
void setGreen(FastType _green) { g = _green; }
void setBlue(FastType _blue) { b = _blue; }
void setAlpha(FastType _alpha) { a = _alpha; }
constexpr FastType redNormalized() const { return std::clamp(static_cast<FastType>(r), 0.0f, 1.0f); }
constexpr FastType greenNormalized() const { return std::clamp(static_cast<FastType>(g), 0.0f, 1.0f); }
constexpr FastType blueNormalized() const { return std::clamp(static_cast<FastType>(b), 0.0f, 1.0f); }
constexpr FastType alphaNormalized() const { return std::clamp(static_cast<FastType>(a), 0.0f, 1.0f); }
constexpr quint8 red8() const { return std::lround(redNormalized() * 255.0f); }
constexpr quint8 green8() const { return std::lround(greenNormalized() * 255.0f); }
constexpr quint8 blue8() const { return std::lround(blueNormalized() * 255.0f); }
constexpr quint8 alpha8() const { return std::lround(alphaNormalized() * 255.0f); }
constexpr uint toArgb32() const
{
return uint((alpha8() << 24) | (red8() << 16) | (green8() << 8) | blue8());
}
constexpr quint16 red16() const { return std::lround(redNormalized() * 65535.0f); }
constexpr quint16 green16() const { return std::lround(greenNormalized() * 65535.0f); }
constexpr quint16 blue16() const { return std::lround(blueNormalized() * 65535.0f); }
constexpr quint16 alpha16() const { return std::lround(alphaNormalized() * 65535.0f); }
constexpr Q_ALWAYS_INLINE QRgbaFloat premultiplied() const
{
return QRgbaFloat{r * a, g * a, b * a, a};
}
constexpr Q_ALWAYS_INLINE QRgbaFloat unpremultiplied() const
{
if (a <= 0.0f)
return QRgbaFloat{0.0f, 0.0f, 0.0f, 0.0f};
if (a >= 1.0f)
return *this;
const FastType ia = 1.0f / a;
return QRgbaFloat{r * ia, g * ia, b * ia, a};
}
};
typedef QRgbaFloat<qfloat16> QRgbaFloat16;
typedef QRgbaFloat<float> QRgbaFloat32;
QT_END_NAMESPACE
#endif // QRGBAFLOAT_H
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