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/*
* Simd Library (http://ermig1979.github.io/Simd).
*
* Copyright (c) 2011-2022 Yermalayeu Ihar.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "Simd/SimdMemory.h"
#include "Simd/SimdStore.h"
namespace Simd
{
#ifdef SIMD_SSE41_ENABLE
namespace Sse41
{
namespace
{
struct Buffer
{
Buffer(size_t width)
{
_p = Allocate(sizeof(uint16_t) * 4 * width);
src0 = (uint16_t*)_p;
src1 = src0 + width;
src2 = src1 + width;
src3 = src2 + width;
}
~Buffer()
{
Free(_p);
}
uint16_t * src0;
uint16_t * src1;
uint16_t * src2;
uint16_t * src3;
private:
void * _p;
};
}
SIMD_INLINE __m128i DivideBy64(__m128i value)
{
return _mm_srli_epi16(_mm_add_epi16(value, K16_0020), 6);
}
const __m128i K8_01_03 = SIMD_MM_SET2_EPI8(1, 3);
const __m128i K8_03_01 = SIMD_MM_SET2_EPI8(3, 1);
SIMD_INLINE __m128i BinomialSum16(const __m128i & ab, const __m128i & cd)
{
return _mm_add_epi16(_mm_maddubs_epi16(ab, K8_01_03), _mm_maddubs_epi16(cd, K8_03_01));
}
SIMD_INLINE __m128i ReduceColNose(const uint8_t *src)
{
const __m128i t1 = _mm_loadu_si128((__m128i*)src);
const __m128i t2 = _mm_loadu_si128((__m128i*)(src + 1));
return BinomialSum16(LoadBeforeFirst<1>(t1), t2);
}
SIMD_INLINE __m128i ReduceColBody(const uint8_t *src)
{
const __m128i t0 = _mm_loadu_si128((__m128i*)(src - 1));
const __m128i t2 = _mm_loadu_si128((__m128i*)(src + 1));
return BinomialSum16(t0, t2);
}
template <bool even> SIMD_INLINE __m128i ReduceColTail(const uint8_t *src);
template <> SIMD_INLINE __m128i ReduceColTail<true>(const uint8_t *src)
{
const __m128i t0 = _mm_loadu_si128((__m128i*)(src - 1));
const __m128i t1 = _mm_loadu_si128((__m128i*)src);
return BinomialSum16(t0, LoadAfterLast<1>(t1));
}
template <> SIMD_INLINE __m128i ReduceColTail<false>(const uint8_t *src)
{
const __m128i t0 = _mm_loadu_si128((__m128i*)(src - 1));
return BinomialSum16(t0, LoadAfterLast<1>(LoadAfterLast<1>(t0)));
}
template <bool align> SIMD_INLINE __m128i ReduceRow(const Buffer & buffer, size_t offset)
{
return _mm_packus_epi16(_mm_and_si128(DivideBy64(BinomialSum16(
Load<align>((__m128i*)(buffer.src0 + offset)), Load<align>((__m128i*)(buffer.src1 + offset)),
Load<align>((__m128i*)(buffer.src2 + offset)), Load<align>((__m128i*)(buffer.src3 + offset)))), K16_00FF), K_ZERO);
}
template <bool even> void ReduceGray4x4(const uint8_t *src, size_t srcWidth, size_t srcHeight, size_t srcStride,
uint8_t *dst, size_t dstWidth, size_t dstHeight, size_t dstStride)
{
assert((srcWidth + 1) / 2 == dstWidth && (srcHeight + 1) / 2 == dstHeight && srcWidth > A);
size_t alignedDstWidth = Simd::AlignLo(dstWidth, HA);
size_t srcTail = Simd::AlignHi(srcWidth - A, 2);
Buffer buffer(Simd::AlignHi(dstWidth, A));
__m128i tmp = ReduceColNose(src);
Store<true>((__m128i*)buffer.src0, tmp);
Store<true>((__m128i*)buffer.src1, tmp);
size_t srcCol = A, dstCol = HA;
for (; srcCol < srcWidth - A; srcCol += A, dstCol += HA)
{
tmp = ReduceColBody(src + srcCol);
Store<true>((__m128i*)(buffer.src0 + dstCol), tmp);
Store<true>((__m128i*)(buffer.src1 + dstCol), tmp);
}
tmp = ReduceColTail<even>(src + srcTail);
Store<false>((__m128i*)(buffer.src0 + dstWidth - HA), tmp);
Store<false>((__m128i*)(buffer.src1 + dstWidth - HA), tmp);
for (size_t row = 0; row < srcHeight; row += 2, dst += dstStride)
{
const uint8_t *src2 = src + srcStride*(row + 1);
const uint8_t *src3 = src2 + srcStride;
if (row >= srcHeight - 2)
{
src2 = src + srcStride*(srcHeight - 1);
src3 = src2;
}
Store<true>((__m128i*)buffer.src2, ReduceColNose(src2));
Store<true>((__m128i*)buffer.src3, ReduceColNose(src3));
size_t srcCol = A, dstCol = HA;
for (; srcCol < srcWidth - A; srcCol += A, dstCol += HA)
{
Store<true>((__m128i*)(buffer.src2 + dstCol), ReduceColBody(src2 + srcCol));
Store<true>((__m128i*)(buffer.src3 + dstCol), ReduceColBody(src3 + srcCol));
}
Store<false>((__m128i*)(buffer.src2 + dstWidth - HA), ReduceColTail<even>(src2 + srcTail));
Store<false>((__m128i*)(buffer.src3 + dstWidth - HA), ReduceColTail<even>(src3 + srcTail));
for (size_t col = 0; col < alignedDstWidth; col += HA)
_mm_storel_epi64((__m128i*)(dst + col), ReduceRow<true>(buffer, col));
if (alignedDstWidth != dstWidth)
_mm_storel_epi64((__m128i*)(dst + dstWidth - HA), ReduceRow<false>(buffer, dstWidth - HA));
Swap(buffer.src0, buffer.src2);
Swap(buffer.src1, buffer.src3);
}
}
void ReduceGray4x4(const uint8_t *src, size_t srcWidth, size_t srcHeight, size_t srcStride,
uint8_t *dst, size_t dstWidth, size_t dstHeight, size_t dstStride)
{
if (Aligned(srcWidth, 2))
ReduceGray4x4<true>(src, srcWidth, srcHeight, srcStride, dst, dstWidth, dstHeight, dstStride);
else
ReduceGray4x4<false>(src, srcWidth, srcHeight, srcStride, dst, dstWidth, dstHeight, dstStride);
}
}
#endif
}
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