1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
// 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 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 <QtGui/qrgb.h>
#include <QtGui/qrgba64.h>
#include <cmath>
#include <memory>
#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:
static std::shared_ptr<QColorTrcLut> fromGamma(qreal gamma);
static std::shared_ptr<QColorTrcLut> fromTransferFunction(const QColorTransferFunction &transfn);
static std::shared_ptr<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() { } // force uninitialized members
static std::shared_ptr<QColorTrcLut> create();
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
|
