File: C:/Users/fred/anaconda3/Library/include/qt/QtGui/5.15.2/QtGui/private/qcolortrclut_p.h
/****************************************************************************
**
** Copyright (C) 2016 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 QCOLORTRCLUT_P_H
#define QCOLORTRCLUT_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtGui/private/qtguiglobal_p.h>
#include <QtCore/qsharedpointer.h>
#include <QtGui/qrgb.h>
#include <QtGui/qrgba64.h>
#include <cmath>
#if defined(__SSE2__)
#include <emmintrin.h>
#elif defined(__ARM_NEON__) || defined(__ARM_NEON)
#include <arm_neon.h>
#endif
QT_BEGIN_NAMESPACE
class QColorTransferFunction;
class QColorTransferTable;
class Q_GUI_EXPORT QColorTrcLut : public QEnableSharedFromThis<QColorTrcLut>
{
public:
static QColorTrcLut *fromGamma(qreal gamma);
static QColorTrcLut *fromTransferFunction(const QColorTransferFunction &transfn);
static QColorTrcLut *fromTransferTable(const QColorTransferTable &transTable);
// The following methods all convert opaque or unpremultiplied colors:
QRgba64 toLinear64(QRgb rgb32) const
{
#if defined(__SSE2__)
__m128i v = _mm_cvtsi32_si128(rgb32);
v = _mm_unpacklo_epi8(v, _mm_setzero_si128());
const __m128i vidx = _mm_slli_epi16(v, 4);
const int ridx = _mm_extract_epi16(vidx, 2);
const int gidx = _mm_extract_epi16(vidx, 1);
const int bidx = _mm_extract_epi16(vidx, 0);
v = _mm_slli_epi16(v, 8); // a * 256
v = _mm_insert_epi16(v, m_toLinear[ridx], 0);
v = _mm_insert_epi16(v, m_toLinear[gidx], 1);
v = _mm_insert_epi16(v, m_toLinear[bidx], 2);
v = _mm_add_epi16(v, _mm_srli_epi16(v, 8));
QRgba64 rgba64;
_mm_storel_epi64(reinterpret_cast<__m128i *>(&rgba64), v);
return rgba64;
#elif (defined(__ARM_NEON__) || defined(__ARM_NEON)) && Q_BYTE_ORDER == Q_LITTLE_ENDIAN
uint8x8_t v8 = vreinterpret_u8_u32(vmov_n_u32(rgb32));
uint16x4_t v16 = vget_low_u16(vmovl_u8(v8));
const uint16x4_t vidx = vshl_n_u16(v16, 4);
const int ridx = vget_lane_u16(vidx, 2);
const int gidx = vget_lane_u16(vidx, 1);
const int bidx = vget_lane_u16(vidx, 0);
v16 = vshl_n_u16(v16, 8); // a * 256
v16 = vset_lane_u16(m_toLinear[ridx], v16, 0);
v16 = vset_lane_u16(m_toLinear[gidx], v16, 1);
v16 = vset_lane_u16(m_toLinear[bidx], v16, 2);
v16 = vadd_u16(v16, vshr_n_u16(v16, 8));
return QRgba64::fromRgba64(vget_lane_u64(vreinterpret_u64_u16(v16), 0));
#else
uint r = m_toLinear[qRed(rgb32) << 4];
uint g = m_toLinear[qGreen(rgb32) << 4];
uint b = m_toLinear[qBlue(rgb32) << 4];
r = r + (r >> 8);
g = g + (g >> 8);
b = b + (b >> 8);
return QRgba64::fromRgba64(r, g, b, qAlpha(rgb32) * 257);
#endif
}
QRgb toLinear(QRgb rgb32) const
{
return convertWithTable(rgb32, m_toLinear);
}
QRgba64 toLinear(QRgba64 rgb64) const
{
return convertWithTable(rgb64, m_toLinear);
}
float u8ToLinearF32(int c) const
{
ushort v = m_toLinear[c << 4];
return v * (1.0f / (255*256));
}
float u16ToLinearF32(int c) const
{
c -= (c >> 8);
ushort v = m_toLinear[c >> 4];
return v * (1.0f / (255*256));
}
float toLinear(float f) const
{
ushort v = m_toLinear[(int)(f * (255 * 16) + 0.5f)];
return v * (1.0f / (255*256));
}
QRgb fromLinear64(QRgba64 rgb64) const
{
#if defined(__SSE2__)
__m128i v = _mm_loadl_epi64(reinterpret_cast<const __m128i *>(&rgb64));
v = _mm_sub_epi16(v, _mm_srli_epi16(v, 8));
const __m128i vidx = _mm_srli_epi16(v, 4);
const int ridx = _mm_extract_epi16(vidx, 0);
const int gidx = _mm_extract_epi16(vidx, 1);
const int bidx = _mm_extract_epi16(vidx, 2);
v = _mm_insert_epi16(v, m_fromLinear[ridx], 2);
v = _mm_insert_epi16(v, m_fromLinear[gidx], 1);
v = _mm_insert_epi16(v, m_fromLinear[bidx], 0);
v = _mm_add_epi16(v, _mm_set1_epi16(0x80));
v = _mm_srli_epi16(v, 8);
v = _mm_packus_epi16(v, v);
return _mm_cvtsi128_si32(v);
#elif (defined(__ARM_NEON__) || defined(__ARM_NEON)) && Q_BYTE_ORDER == Q_LITTLE_ENDIAN
uint16x4_t v = vreinterpret_u16_u64(vmov_n_u64(rgb64));
v = vsub_u16(v, vshr_n_u16(v, 8));
const uint16x4_t vidx = vshr_n_u16(v, 4);
const int ridx = vget_lane_u16(vidx, 0);
const int gidx = vget_lane_u16(vidx, 1);
const int bidx = vget_lane_u16(vidx, 2);
v = vset_lane_u16(m_fromLinear[ridx], v, 2);
v = vset_lane_u16(m_fromLinear[gidx], v, 1);
v = vset_lane_u16(m_fromLinear[bidx], v, 0);
uint8x8_t v8 = vrshrn_n_u16(vcombine_u16(v, v), 8);
return vget_lane_u32(vreinterpret_u32_u8(v8), 0);
#else
uint a = rgb64.alpha();
uint r = rgb64.red();
uint g = rgb64.green();
uint b = rgb64.blue();
a = a - (a >> 8);
r = r - (r >> 8);
g = g - (g >> 8);
b = b - (b >> 8);
a = (a + 0x80) >> 8;
r = (m_fromLinear[r >> 4] + 0x80) >> 8;
g = (m_fromLinear[g >> 4] + 0x80) >> 8;
b = (m_fromLinear[b >> 4] + 0x80) >> 8;
return (a << 24) | (r << 16) | (g << 8) | b;
#endif
}
QRgb fromLinear(QRgb rgb32) const
{
return convertWithTable(rgb32, m_fromLinear);
}
QRgba64 fromLinear(QRgba64 rgb64) const
{
return convertWithTable(rgb64, m_fromLinear);
}
int u8FromLinearF32(float f) const
{
ushort v = m_fromLinear[(int)(f * (255 * 16) + 0.5f)];
return (v + 0x80) >> 8;
}
int u16FromLinearF32(float f) const
{
ushort v = m_fromLinear[(int)(f * (255 * 16) + 0.5f)];
return v + (v >> 8);
}
float fromLinear(float f) const
{
ushort v = m_fromLinear[(int)(f * (255 * 16) + 0.5f)];
return v * (1.0f / (255*256));
}
// We translate to 0-65280 (255*256) instead to 0-65535 to make simple
// shifting an accurate conversion.
// We translate from 0-4080 (255*16) for the same speed up, and to keep
// the tables small enough to fit in most inner caches.
ushort m_toLinear[(255 * 16) + 1]; // [0-4080] -> [0-65280]
ushort m_fromLinear[(255 * 16) + 1]; // [0-4080] -> [0-65280]
private:
QColorTrcLut() { }
Q_ALWAYS_INLINE static QRgb convertWithTable(QRgb rgb32, const ushort *table)
{
const int r = (table[qRed(rgb32) << 4] + 0x80) >> 8;
const int g = (table[qGreen(rgb32) << 4] + 0x80) >> 8;
const int b = (table[qBlue(rgb32) << 4] + 0x80) >> 8;
return (rgb32 & 0xff000000) | (r << 16) | (g << 8) | b;
}
Q_ALWAYS_INLINE static QRgba64 convertWithTable(QRgba64 rgb64, const ushort *table)
{
#if defined(__SSE2__)
__m128i v = _mm_loadl_epi64(reinterpret_cast<const __m128i *>(&rgb64));
v = _mm_sub_epi16(v, _mm_srli_epi16(v, 8));
const __m128i vidx = _mm_srli_epi16(v, 4);
const int ridx = _mm_extract_epi16(vidx, 2);
const int gidx = _mm_extract_epi16(vidx, 1);
const int bidx = _mm_extract_epi16(vidx, 0);
v = _mm_insert_epi16(v, table[ridx], 2);
v = _mm_insert_epi16(v, table[gidx], 1);
v = _mm_insert_epi16(v, table[bidx], 0);
v = _mm_add_epi16(v, _mm_srli_epi16(v, 8));
QRgba64 rgba64;
_mm_storel_epi64(reinterpret_cast<__m128i *>(&rgba64), v);
return rgba64;
#elif (defined(__ARM_NEON__) || defined(__ARM_NEON)) && Q_BYTE_ORDER == Q_LITTLE_ENDIAN
uint16x4_t v = vreinterpret_u16_u64(vmov_n_u64(rgb64));
v = vsub_u16(v, vshr_n_u16(v, 8));
const uint16x4_t vidx = vshr_n_u16(v, 4);
const int ridx = vget_lane_u16(vidx, 2);
const int gidx = vget_lane_u16(vidx, 1);
const int bidx = vget_lane_u16(vidx, 0);
v = vset_lane_u16(table[ridx], v, 2);
v = vset_lane_u16(table[gidx], v, 1);
v = vset_lane_u16(table[bidx], v, 0);
v = vadd_u16(v, vshr_n_u16(v, 8));
return QRgba64::fromRgba64(vget_lane_u64(vreinterpret_u64_u16(v), 0));
#else
ushort r = rgb64.red();
ushort g = rgb64.green();
ushort b = rgb64.blue();
r = r - (r >> 8);
g = g - (g >> 8);
b = b - (b >> 8);
r = table[r >> 4];
g = table[g >> 4];
b = table[b >> 4];
r = r + (r >> 8);
g = g + (g >> 8);
b = b + (b >> 8);
return QRgba64::fromRgba64(r, g, b, rgb64.alpha());
#endif
}
};
QT_END_NAMESPACE
#endif // QCOLORTRCLUT_P_H