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/* 15/11/24 kleisauke
* - from shrinkv_hwy.cpp
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <vips/vips.h>
#include <vips/vector.h>
#include <vips/debug.h>
#include <vips/internal.h>
#include "presample.h"
#ifdef HAVE_HWY
#undef HWY_TARGET_INCLUDE
#define HWY_TARGET_INCLUDE "libvips/resample/shrinkh_hwy.cpp"
#include <hwy/foreach_target.h>
#include <hwy/highway.h>
namespace HWY_NAMESPACE {
using namespace hwy::HWY_NAMESPACE;
using DU32 = ScalableTag<uint32_t>;
constexpr Rebind<uint8_t, DU32> du8x32;
constexpr DU32 du32;
constexpr int64_t max_uint32 = 1LL << 32;
constexpr int32_t max_bits = 1 << 8;
HWY_ATTR void
vips_shrinkh_uchar_hwy(VipsPel *pout, VipsPel *pin,
int32_t width, int32_t hshrink, int32_t bands)
{
#if HWY_TARGET != HWY_SCALAR
const auto multiplier = Set(du32, max_uint32 / (max_bits * hshrink));
const auto amend = Set(du32, hshrink / 2);
int32_t ix = 0;
for (int32_t x = 0; x < width; ++x) {
auto *HWY_RESTRICT p = (uint8_t *) pin + ix * bands;
auto *HWY_RESTRICT q = (uint8_t *) pout + x * bands;
auto sum0 = amend;
int32_t xx = 0;
for (; xx + 2 <= hshrink; xx += 2) {
auto pix0 = PromoteTo(du32, LoadU(du8x32, p));
p += bands;
auto pix1 = PromoteTo(du32, LoadU(du8x32, p));
p += bands;
pix0 = Add(pix0, pix1);
sum0 = Add(sum0, pix0);
}
for (; xx < hshrink; ++xx) {
auto pix0 = PromoteTo(du32, LoadU(du8x32, p));
p += bands;
sum0 = Add(sum0, pix0);
}
sum0 = Mul(sum0, multiplier);
/* The final 32->8 conversion.
*/
sum0 = ShiftRight<24>(sum0);
auto demoted = DemoteTo(du8x32, sum0);
StoreU(demoted, du8x32, q);
ix += hshrink;
}
#endif
}
} /*namespace HWY_NAMESPACE*/
#if HWY_ONCE
HWY_EXPORT(vips_shrinkh_uchar_hwy);
void
vips_shrinkh_uchar_hwy(VipsPel *pout, VipsPel *pin,
int width, int hshrink, int bands)
{
/* clang-format off */
HWY_DYNAMIC_DISPATCH(vips_shrinkh_uchar_hwy)(pout, pin,
width, hshrink, bands);
/* clang-format on */
}
#endif /*HWY_ONCE*/
#endif /*HAVE_HWY*/
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