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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QRGBA64_H
#define QRGBA64_H
#include <QtGui/qtguiglobal.h>
#include <QtCore/qprocessordetection.h>
QT_BEGIN_NAMESPACE
class QRgba64 {
quint64 rgba;
// Make sure that the representation always has the order: red green blue alpha, independent
// of byte order. This way, vector operations that assume 4 16-bit values see the correct ones.
enum Shifts {
#if Q_BYTE_ORDER == Q_BIG_ENDIAN
RedShift = 48,
GreenShift = 32,
BlueShift = 16,
AlphaShift = 0
#else // little endian:
RedShift = 0,
GreenShift = 16,
BlueShift = 32,
AlphaShift = 48
#endif
};
explicit Q_ALWAYS_INLINE constexpr QRgba64(quint64 c) : rgba(c) { }
public:
QRgba64() = default;
constexpr static
QRgba64 fromRgba64(quint64 c)
{
return QRgba64(c);
}
constexpr static
QRgba64 fromRgba64(quint16 red, quint16 green, quint16 blue, quint16 alpha)
{
return fromRgba64(quint64(red) << RedShift
| quint64(green) << GreenShift
| quint64(blue) << BlueShift
| quint64(alpha) << AlphaShift);
}
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;
}
constexpr static
QRgba64 fromArgb32(uint rgb)
{
return fromRgba(quint8(rgb >> 16), quint8(rgb >> 8), quint8(rgb), quint8(rgb >> 24));
}
constexpr bool isOpaque() const
{
return (rgba & alphaMask()) == alphaMask();
}
constexpr bool isTransparent() const
{
return (rgba & alphaMask()) == 0;
}
constexpr quint16 red() const { return quint16(rgba >> RedShift); }
constexpr quint16 green() const { return quint16(rgba >> GreenShift); }
constexpr quint16 blue() const { return quint16(rgba >> BlueShift); }
constexpr quint16 alpha() const { return quint16(rgba >> AlphaShift); }
void setRed(quint16 _red) { rgba = (rgba & ~(Q_UINT64_C(0xffff) << RedShift)) | (quint64(_red) << RedShift); }
void setGreen(quint16 _green) { rgba = (rgba & ~(Q_UINT64_C(0xffff) << GreenShift)) | (quint64(_green) << GreenShift); }
void setBlue(quint16 _blue) { rgba = (rgba & ~(Q_UINT64_C(0xffff) << BlueShift)) | (quint64(_blue) << BlueShift); }
void setAlpha(quint16 _alpha) { rgba = (rgba & ~(Q_UINT64_C(0xffff) << AlphaShift)) | (quint64(_alpha) << AlphaShift); }
constexpr quint8 red8() const { return div_257(red()); }
constexpr quint8 green8() const { return div_257(green()); }
constexpr quint8 blue8() const { return div_257(blue()); }
constexpr quint8 alpha8() const { return div_257(alpha()); }
constexpr uint toArgb32() const
{
quint64 br = rgba & Q_UINT64_C(0xffff0000ffff);
quint64 ag = (rgba >> 16) & Q_UINT64_C(0xffff0000ffff);
br += Q_UINT64_C(0x8000000080);
ag += Q_UINT64_C(0x8000000080);
br = (br - ((br >> 8) & Q_UINT64_C(0xffff0000ffff))) >> 8;
ag = (ag - ((ag >> 8) & Q_UINT64_C(0xffff0000ffff)));
#if Q_BYTE_ORDER == Q_BIG_ENDIAN
return ((br << 24) & 0xff000000)
| ((ag >> 24) & 0xff0000)
| ((br >> 24) & 0xff00)
| ((ag >> 8) & 0xff);
#else
return ((ag >> 16) & 0xff000000)
| ((br << 16) & 0xff0000)
| (ag & 0xff00)
| ((br >> 32) & 0xff);
#endif
}
constexpr ushort toRgb16() const
{
return ushort((red() & 0xf800) | ((green() >> 10) << 5) | (blue() >> 11));
}
constexpr QRgba64 premultiplied() const
{
if (isOpaque())
return *this;
if (isTransparent())
return QRgba64::fromRgba64(0);
const quint64 a = alpha();
quint64 br = (rgba & Q_UINT64_C(0xffff0000ffff)) * a;
quint64 ag = ((rgba >> 16) & Q_UINT64_C(0xffff0000ffff)) * a;
br = (br + ((br >> 16) & Q_UINT64_C(0xffff0000ffff)) + Q_UINT64_C(0x800000008000));
ag = (ag + ((ag >> 16) & Q_UINT64_C(0xffff0000ffff)) + Q_UINT64_C(0x800000008000));
#if Q_BYTE_ORDER == Q_BIG_ENDIAN
ag = ag & Q_UINT64_C(0xffff0000ffff0000);
br = (br >> 16) & Q_UINT64_C(0xffff00000000);
return fromRgba64(a | br | ag);
#else
br = (br >> 16) & Q_UINT64_C(0xffff0000ffff);
ag = ag & Q_UINT64_C(0xffff0000);
return fromRgba64((a << 48) | br | ag);
#endif
}
constexpr QRgba64 unpremultiplied() const
{
#if Q_PROCESSOR_WORDSIZE < 8
return unpremultiplied_32bit();
#else
return unpremultiplied_64bit();
#endif
}
constexpr operator quint64() const
{
return rgba;
}
QRgba64 &operator=(quint64 _rgba) noexcept
{
rgba = _rgba;
return *this;
}
private:
static constexpr Q_ALWAYS_INLINE quint64 alphaMask() { return Q_UINT64_C(0xffff) << AlphaShift; }
static constexpr Q_ALWAYS_INLINE quint8 div_257_floor(uint x) { return quint8((x - (x >> 8)) >> 8); }
static constexpr Q_ALWAYS_INLINE quint8 div_257(quint16 x) { return div_257_floor(x + 128U); }
constexpr Q_ALWAYS_INLINE QRgba64 unpremultiplied_32bit() const
{
if (isOpaque() || isTransparent())
return *this;
const quint32 a = alpha();
const quint16 r = quint16((red() * 0xffff + a/2) / a);
const quint16 g = quint16((green() * 0xffff + a/2) / a);
const quint16 b = quint16((blue() * 0xffff + a/2) / a);
return fromRgba64(r, g, b, quint16(a));
}
constexpr Q_ALWAYS_INLINE QRgba64 unpremultiplied_64bit() const
{
if (isOpaque() || isTransparent())
return *this;
const quint64 a = alpha();
const quint64 fa = (Q_UINT64_C(0xffff00008000) + a/2) / a;
const quint16 r = quint16((red() * fa + 0x80000000) >> 32);
const quint16 g = quint16((green() * fa + 0x80000000) >> 32);
const quint16 b = quint16((blue() * fa + 0x80000000) >> 32);
return fromRgba64(r, g, b, quint16(a));
}
};
Q_DECLARE_TYPEINFO(QRgba64, Q_PRIMITIVE_TYPE);
constexpr inline QRgba64 qRgba64(quint16 r, quint16 g, quint16 b, quint16 a)
{
return QRgba64::fromRgba64(r, g, b, a);
}
constexpr inline QRgba64 qRgba64(quint64 c)
{
return QRgba64::fromRgba64(c);
}
constexpr inline QRgba64 qPremultiply(QRgba64 c)
{
return c.premultiplied();
}
constexpr inline QRgba64 qUnpremultiply(QRgba64 c)
{
return c.unpremultiplied();
}
inline constexpr uint qRed(QRgba64 rgb)
{ return rgb.red8(); }
inline constexpr uint qGreen(QRgba64 rgb)
{ return rgb.green8(); }
inline constexpr uint qBlue(QRgba64 rgb)
{ return rgb.blue8(); }
inline constexpr uint qAlpha(QRgba64 rgb)
{ return rgb.alpha8(); }
QT_END_NAMESPACE
#endif // QRGBA64_H
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