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
|
// Copyright (C) 2024 Loongson Technology Corporation Limited.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include <qimage.h>
#include <private/qimage_p.h>
#include <private/qsimd_p.h>
#ifdef QT_COMPILER_SUPPORTS_LASX
QT_BEGIN_NAMESPACE
// Convert a scanline of RGB888 (src) to RGB32 (dst)
// src must be at least len * 3 bytes
// dst must be at least len * 4 bytes
Q_GUI_EXPORT void QT_FASTCALL qt_convert_rgb888_to_rgb32_lasx(quint32 *dst, const uchar *src, int len)
{
int i = 0;
// Prologue, align dst to 32 bytes.
ALIGNMENT_PROLOGUE_32BYTES(dst, i, len) {
dst[i] = qRgb(src[0], src[1], src[2]);
src += 3;
}
// Mask 8 colors of the RGB888 vector
const __m256i shuffleMask1 = (__m256i)(v32i8){2, 1, 0, 16, 5, 4, 3, 16, 8, 7, 6, 16, 11, 10, 9, 16,
30, 29, 28, 16, 1, 0, 31, 16, 4, 3, 2, 16, 7, 6, 5, 16};
// Mask 8 colors of a RGB888 vector with an offset of shuffleMask1
const __m256i shuffleMask2 = (__m256i)(v32i8){10, 9, 8, 0, 13, 12, 11, 0, 16, 15, 14, 0, 19, 18, 17, 0,
6, 5, 4, 0, 9, 8, 7, 0, 12, 11, 10, 0, 15, 14, 13, 0};
const __m256i alphaMask = __lasx_xvreplgr2vr_w(0xff000000);
const __m256i *inVectorPtr = (const __m256i *)src;
__m256i *dstVectorPtr = (__m256i *)(dst + i);
for (; i < (len - 31); i += 32) { // one iteration in the loop converts 32 pixels
/*
RGB888 has 10 pixels per vector, + 2 byte from the next pixel. The idea here is
to load vectors of RGB888 and use palignr to select a vector out of two vectors.
After 3 loads of RGB888 and 3 stores of RGB32, we have 8 pixels left in the last
vector of RGB888, we can mask it directly to get a last store or RGB32. After that,
the first next byte is a R, and we can loop for the next 32 pixels.
The conversion itself is done with a byte permutation (xvshuf_b and xvpermi_q).
*/
__m256i firstSrcVector = __lasx_xvld(inVectorPtr, 0);
__m256i rFirstSrcVector = __lasx_xvpermi_q(firstSrcVector, firstSrcVector, 0b00000001);
__m256i outputVector = __lasx_xvshuf_b(rFirstSrcVector, firstSrcVector, shuffleMask1);
__lasx_xvst(__lasx_xvor_v(outputVector, alphaMask), dstVectorPtr, 0);
++inVectorPtr;
++dstVectorPtr;
// There are 8 unused bytes left in srcVector, we need to load the next 32 bytes
// and load the next input with palignr
__m256i secondSrcVector = __lasx_xvld(inVectorPtr, 0);
__m256i srcVector = __lasx_xvpermi_q(secondSrcVector, firstSrcVector, 0b00100001);
__m256i rSrcVector = __lasx_xvpermi_q(srcVector, srcVector, 0b00000001);
outputVector = __lasx_xvshuf_b(rSrcVector, srcVector, shuffleMask2);
__lasx_xvst(__lasx_xvor_v(outputVector, alphaMask), dstVectorPtr, 0);
++inVectorPtr;
++dstVectorPtr;
// We now have 16 unused bytes left in firstSrcVector
__m256i thirdSrcVector = __lasx_xvld(inVectorPtr, 0);
srcVector = __lasx_xvpermi_q(thirdSrcVector, secondSrcVector, 0b00100001);
rSrcVector = __lasx_xvpermi_q(srcVector, srcVector, 0b00000001);
outputVector = __lasx_xvshuf_b(rSrcVector, srcVector, shuffleMask1);
__lasx_xvst(__lasx_xvor_v(outputVector, alphaMask), dstVectorPtr, 0);
++inVectorPtr;
++dstVectorPtr;
// There are now 24 unused bytes in firstSrcVector.
// We can mask them directly, almost there.
srcVector = thirdSrcVector;
rSrcVector = __lasx_xvpermi_q(srcVector, srcVector, 0b00000001);
outputVector = __lasx_xvshuf_b(rSrcVector, srcVector, shuffleMask2);
__lasx_xvst(__lasx_xvor_v(outputVector, alphaMask), dstVectorPtr, 0);
++dstVectorPtr;
}
src = (const uchar *)inVectorPtr;
SIMD_EPILOGUE(i, len, 31) {
dst[i] = qRgb(src[0], src[1], src[2]);
src += 3;
}
}
void convert_RGB888_to_RGB32_lasx(QImageData *dest, const QImageData *src, Qt::ImageConversionFlags)
{
Q_ASSERT(src->format == QImage::Format_RGB888 || src->format == QImage::Format_BGR888);
if (src->format == QImage::Format_BGR888)
Q_ASSERT(dest->format == QImage::Format_RGBX8888 || dest->format == QImage::Format_RGBA8888 || dest->format == QImage::Format_RGBA8888_Premultiplied);
else
Q_ASSERT(dest->format == QImage::Format_RGB32 || dest->format == QImage::Format_ARGB32 || dest->format == QImage::Format_ARGB32_Premultiplied);
Q_ASSERT(src->width == dest->width);
Q_ASSERT(src->height == dest->height);
const uchar *src_data = (uchar *) src->data;
quint32 *dest_data = (quint32 *) dest->data;
for (int i = 0; i < src->height; ++i) {
qt_convert_rgb888_to_rgb32_lasx(dest_data, src_data, src->width);
src_data += src->bytes_per_line;
dest_data = (quint32 *)((uchar*)dest_data + dest->bytes_per_line);
}
}
QT_END_NAMESPACE
#endif // QT_COMPILER_SUPPORTS_LASX
|
