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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
#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
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