summaryrefslogtreecommitdiff
path: root/src/gui/painting/qimagescale_neon.cpp
blob: 074b8198626246292fe0df19b017e1220e4488de (plain)
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
// 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

#include "qimagescale_p.h"
#include "qimage.h"
#include <private/qsimd_p.h>

#if QT_CONFIG(thread) && !defined(Q_OS_WASM)
#include <qsemaphore.h>
#include <qthreadpool.h>
#include <private/qthreadpool_p.h>
#endif

#if defined(__ARM_NEON__)

QT_BEGIN_NAMESPACE

using namespace QImageScale;

template<typename T>
static inline void multithread_pixels_function(QImageScaleInfo *isi, int dh, const T &scaleSection)
{
#if QT_CONFIG(thread) && !defined(Q_OS_WASM)
    int segments = (qsizetype(isi->sh) * isi->sw) / (1<<16);
    segments = std::min(segments, dh);
    QThreadPool *threadPool = QThreadPoolPrivate::qtGuiInstance();
    if (segments > 1 && threadPool && !threadPool->contains(QThread::currentThread())) {
        QSemaphore semaphore;
        int y = 0;
        for (int i = 0; i < segments; ++i) {
            int yn = (dh - y) / (segments - i);
            threadPool->start([&, y, yn]() {
                scaleSection(y, y + yn);
                semaphore.release(1);
            });
            y += yn;
        }
        semaphore.acquire(segments);
        return;
    }
#endif
    scaleSection(0, dh);
}

inline static uint32x4_t qt_qimageScaleAARGBA_helper(const unsigned int *pix, int xyap, int Cxy, int step)
{
    uint32x2_t vpix32 = vmov_n_u32(*pix);
    uint16x4_t vpix16 = vget_low_u16(vmovl_u8(vreinterpret_u8_u32(vpix32)));
    uint32x4_t vx = vmull_n_u16(vpix16, xyap);
    int i;
    for (i = (1 << 14) - xyap; i > Cxy; i -= Cxy) {
        pix += step;
        vpix32 = vmov_n_u32(*pix);
        vpix16 = vget_low_u16(vmovl_u8(vreinterpret_u8_u32(vpix32)));
        vx = vaddq_u32(vx, vmull_n_u16(vpix16, Cxy));
    }
    pix += step;
    vpix32 = vmov_n_u32(*pix);
    vpix16 = vget_low_u16(vmovl_u8(vreinterpret_u8_u32(vpix32)));
    vx = vaddq_u32(vx, vmull_n_u16(vpix16, i));
    return vx;
}

template<bool RGB>
void qt_qimageScaleAARGBA_up_x_down_y_neon(QImageScaleInfo *isi, unsigned int *dest,
                                           int dw, int dh, int dow, int sow)
{
    const unsigned int **ypoints = isi->ypoints;
    int *xpoints = isi->xpoints;
    int *xapoints = isi->xapoints;
    int *yapoints = isi->yapoints;

    /* go through every scanline in the output buffer */
    auto scaleSection = [&] (int yStart, int yEnd) {
        for (int y = yStart; y < yEnd; ++y) {
            int Cy = yapoints[y] >> 16;
            int yap = yapoints[y] & 0xffff;

            unsigned int *dptr = dest + (y * dow);
            for (int x = 0; x < dw; x++) {
                const unsigned int *sptr = ypoints[y] + xpoints[x];
                uint32x4_t vx = qt_qimageScaleAARGBA_helper(sptr, yap, Cy, sow);

                int xap = xapoints[x];
                if (xap > 0) {
                    uint32x4_t vr = qt_qimageScaleAARGBA_helper(sptr + 1, yap, Cy, sow);

                    vx = vmulq_n_u32(vx, 256 - xap);
                    vr = vmulq_n_u32(vr, xap);
                    vx = vaddq_u32(vx, vr);
                    vx = vshrq_n_u32(vx, 8);
                }
                vx = vshrq_n_u32(vx, 14);
                const uint16x4_t vx16 = vmovn_u32(vx);
                const uint8x8_t vx8 = vmovn_u16(vcombine_u16(vx16, vx16));
                *dptr = vget_lane_u32(vreinterpret_u32_u8(vx8), 0);
                if (RGB)
                    *dptr |= 0xff000000;
                dptr++;
            }
        }
    };
    multithread_pixels_function(isi, dh, scaleSection);
}

template<bool RGB>
void qt_qimageScaleAARGBA_down_x_up_y_neon(QImageScaleInfo *isi, unsigned int *dest,
                                           int dw, int dh, int dow, int sow)
{
    const unsigned int **ypoints = isi->ypoints;
    int *xpoints = isi->xpoints;
    int *xapoints = isi->xapoints;
    int *yapoints = isi->yapoints;

    /* go through every scanline in the output buffer */
    auto scaleSection = [&] (int yStart, int yEnd) {
        for (int y = yStart; y < yEnd; ++y) {
            unsigned int *dptr = dest + (y * dow);
            for (int x = 0; x < dw; x++) {
                int Cx = xapoints[x] >> 16;
                int xap = xapoints[x] & 0xffff;

                const unsigned int *sptr = ypoints[y] + xpoints[x];
                uint32x4_t vx = qt_qimageScaleAARGBA_helper(sptr, xap, Cx, 1);

                int yap = yapoints[y];
                if (yap > 0) {
                    uint32x4_t vr = qt_qimageScaleAARGBA_helper(sptr + sow, xap, Cx, 1);

                    vx = vmulq_n_u32(vx, 256 - yap);
                    vr = vmulq_n_u32(vr, yap);
                    vx = vaddq_u32(vx, vr);
                    vx = vshrq_n_u32(vx, 8);
                }
                vx = vshrq_n_u32(vx, 14);
                const uint16x4_t vx16 = vmovn_u32(vx);
                const uint8x8_t vx8 = vmovn_u16(vcombine_u16(vx16, vx16));
                *dptr = vget_lane_u32(vreinterpret_u32_u8(vx8), 0);
                if (RGB)
                    *dptr |= 0xff000000;
                dptr++;
            }
        }
    };
    multithread_pixels_function(isi, dh, scaleSection);
}

template<bool RGB>
void qt_qimageScaleAARGBA_down_xy_neon(QImageScaleInfo *isi, unsigned int *dest,
                                       int dw, int dh, int dow, int sow)
{
    const unsigned int **ypoints = isi->ypoints;
    int *xpoints = isi->xpoints;
    int *xapoints = isi->xapoints;
    int *yapoints = isi->yapoints;

    auto scaleSection = [&] (int yStart, int yEnd) {
        for (int y = yStart; y < yEnd; ++y) {
            int Cy = yapoints[y] >> 16;
            int yap = yapoints[y] & 0xffff;

            unsigned int *dptr = dest + (y * dow);
            for (int x = 0; x < dw; x++) {
                const int Cx = xapoints[x] >> 16;
                const int xap = xapoints[x] & 0xffff;

                const unsigned int *sptr = ypoints[y] + xpoints[x];
                uint32x4_t vx = qt_qimageScaleAARGBA_helper(sptr, xap, Cx, 1);
                vx = vshrq_n_u32(vx, 4);
                uint32x4_t vr = vmulq_n_u32(vx, yap);

                int j;
                for (j = (1 << 14) - yap; j > Cy; j -= Cy) {
                    sptr += sow;
                    vx = qt_qimageScaleAARGBA_helper(sptr, xap, Cx, 1);
                    vx = vshrq_n_u32(vx, 4);
                    vx = vmulq_n_u32(vx, Cy);
                    vr = vaddq_u32(vr, vx);
                }
                sptr += sow;
                vx = qt_qimageScaleAARGBA_helper(sptr, xap, Cx, 1);
                vx = vshrq_n_u32(vx, 4);
                vx = vmulq_n_u32(vx, j);
                vr = vaddq_u32(vr, vx);

                vx = vshrq_n_u32(vr, 24);
                const uint16x4_t vx16 = vmovn_u32(vx);
                const uint8x8_t vx8 = vmovn_u16(vcombine_u16(vx16, vx16));
                *dptr = vget_lane_u32(vreinterpret_u32_u8(vx8), 0);
                if (RGB)
                    *dptr |= 0xff000000;
                dptr++;
            }
        }
    };
    multithread_pixels_function(isi, dh, scaleSection);
}

template void qt_qimageScaleAARGBA_up_x_down_y_neon<false>(QImageScaleInfo *isi, unsigned int *dest,
                                                           int dw, int dh, int dow, int sow);

template void qt_qimageScaleAARGBA_up_x_down_y_neon<true>(QImageScaleInfo *isi, unsigned int *dest,
                                                          int dw, int dh, int dow, int sow);

template void qt_qimageScaleAARGBA_down_x_up_y_neon<false>(QImageScaleInfo *isi, unsigned int *dest,
                                                           int dw, int dh, int dow, int sow);

template void qt_qimageScaleAARGBA_down_x_up_y_neon<true>(QImageScaleInfo *isi, unsigned int *dest,
                                                          int dw, int dh, int dow, int sow);

template void qt_qimageScaleAARGBA_down_xy_neon<false>(QImageScaleInfo *isi, unsigned int *dest,
                                                       int dw, int dh, int dow, int sow);

template void qt_qimageScaleAARGBA_down_xy_neon<true>(QImageScaleInfo *isi, unsigned int *dest,
                                                      int dw, int dh, int dow, int sow);

QT_END_NAMESPACE

#endif