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// Copyright 2019 The libgav1 Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/dsp/average_blend.h"
#include "src/utils/cpu.h"
#if LIBGAV1_TARGETING_SSE4_1
#include <xmmintrin.h>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include "src/dsp/constants.h"
#include "src/dsp/dsp.h"
#include "src/dsp/x86/common_sse4.h"
#include "src/utils/common.h"
namespace libgav1 {
namespace dsp {
namespace {
constexpr int kInterPostRoundBit = 4;
inline void AverageBlend4Row(const int16_t* prediction_0,
const int16_t* prediction_1, uint8_t* dest) {
const __m128i pred_0 = LoadLo8(prediction_0);
const __m128i pred_1 = LoadLo8(prediction_1);
__m128i res = _mm_add_epi16(pred_0, pred_1);
res = RightShiftWithRounding_S16(res, kInterPostRoundBit + 1);
Store4(dest, _mm_packus_epi16(res, res));
}
inline void AverageBlend8Row(const int16_t* prediction_0,
const int16_t* prediction_1, uint8_t* dest) {
const __m128i pred_0 = LoadAligned16(prediction_0);
const __m128i pred_1 = LoadAligned16(prediction_1);
__m128i res = _mm_add_epi16(pred_0, pred_1);
res = RightShiftWithRounding_S16(res, kInterPostRoundBit + 1);
StoreLo8(dest, _mm_packus_epi16(res, res));
}
inline void AverageBlendLargeRow(const int16_t* prediction_0,
const int16_t* prediction_1, const int width,
uint8_t* dest) {
int x = 0;
do {
const __m128i pred_00 = LoadAligned16(&prediction_0[x]);
const __m128i pred_01 = LoadAligned16(&prediction_1[x]);
__m128i res0 = _mm_add_epi16(pred_00, pred_01);
res0 = RightShiftWithRounding_S16(res0, kInterPostRoundBit + 1);
const __m128i pred_10 = LoadAligned16(&prediction_0[x + 8]);
const __m128i pred_11 = LoadAligned16(&prediction_1[x + 8]);
__m128i res1 = _mm_add_epi16(pred_10, pred_11);
res1 = RightShiftWithRounding_S16(res1, kInterPostRoundBit + 1);
StoreUnaligned16(dest + x, _mm_packus_epi16(res0, res1));
x += 16;
} while (x < width);
}
void AverageBlend_SSE4_1(const void* prediction_0, const void* prediction_1,
const int width, const int height, void* const dest,
const ptrdiff_t dest_stride) {
auto* dst = static_cast<uint8_t*>(dest);
const auto* pred_0 = static_cast<const int16_t*>(prediction_0);
const auto* pred_1 = static_cast<const int16_t*>(prediction_1);
int y = height;
if (width == 4) {
do {
// TODO(b/150326556): |prediction_[01]| values are packed. It is possible
// to load 8 values at a time.
AverageBlend4Row(pred_0, pred_1, dst);
dst += dest_stride;
pred_0 += width;
pred_1 += width;
AverageBlend4Row(pred_0, pred_1, dst);
dst += dest_stride;
pred_0 += width;
pred_1 += width;
y -= 2;
} while (y != 0);
return;
}
if (width == 8) {
do {
AverageBlend8Row(pred_0, pred_1, dst);
dst += dest_stride;
pred_0 += width;
pred_1 += width;
AverageBlend8Row(pred_0, pred_1, dst);
dst += dest_stride;
pred_0 += width;
pred_1 += width;
y -= 2;
} while (y != 0);
return;
}
do {
AverageBlendLargeRow(pred_0, pred_1, width, dst);
dst += dest_stride;
pred_0 += width;
pred_1 += width;
AverageBlendLargeRow(pred_0, pred_1, width, dst);
dst += dest_stride;
pred_0 += width;
pred_1 += width;
y -= 2;
} while (y != 0);
}
void Init8bpp() {
Dsp* const dsp = dsp_internal::GetWritableDspTable(kBitdepth8);
assert(dsp != nullptr);
#if DSP_ENABLED_8BPP_SSE4_1(AverageBlend)
dsp->average_blend = AverageBlend_SSE4_1;
#endif
}
} // namespace
void AverageBlendInit_SSE4_1() { Init8bpp(); }
} // namespace dsp
} // namespace libgav1
#else // !LIBGAV1_TARGETING_SSE4_1
namespace libgav1 {
namespace dsp {
void AverageBlendInit_SSE4_1() {}
} // namespace dsp
} // namespace libgav1
#endif // LIBGAV1_TARGETING_SSE4_1
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