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/*
* Simd Library (http://ermig1979.github.io/Simd).
*
* Copyright (c) 2011-2017 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_NEON_ENABLE
namespace Neon
{
template <bool compensation> SIMD_INLINE uint16x8_t DivideBy16(uint16x8_t value);
template <> SIMD_INLINE uint16x8_t DivideBy16<true>(uint16x8_t value)
{
return vshrq_n_u16(vaddq_u16(value, K16_0008), 4);
}
template <> SIMD_INLINE uint16x8_t DivideBy16<false>(uint16x8_t value)
{
return vshrq_n_u16(value, 4);
}
template<bool align> SIMD_INLINE uint16x8_t ReduceColNose(const uint8_t * src)
{
uint8x16_t t12 = Load<align>(src);
uint8x16_t t01 = LoadBeforeFirst<1>(t12);
return vaddq_u16(vpaddlq_u8(t01), vpaddlq_u8(t12));
}
template<bool align> SIMD_INLINE uint16x8_t ReduceColBody(const uint8_t * src)
{
uint8x16_t t01 = Load<false>(src - 1);
uint8x16_t t12 = Load<align>(src);
return vaddq_u16(vpaddlq_u8(t01), vpaddlq_u8(t12));
}
template <bool compensation> SIMD_INLINE uint8x8_t ReduceRow(const uint16x8_t & r0, const uint16x8_t & r1, const uint16x8_t & r2)
{
return vmovn_u16(DivideBy16<compensation>(BinomialSum16(r0, r1, r2)));
}
template<bool align, bool compensation> void ReduceGray3x3(
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 >= A && (srcWidth + 1) / 2 == dstWidth && (srcHeight + 1) / 2 == dstHeight);
if (align)
assert(Aligned(src) && Aligned(srcStride));
size_t lastOddCol = srcWidth - AlignLo(srcWidth, 2);
size_t bodyWidth = AlignLo(srcWidth, A);
for (size_t row = 0; row < srcHeight; row += 2, dst += dstStride, src += 2 * srcStride)
{
const uint8_t * s1 = src;
const uint8_t * s0 = s1 - (row ? srcStride : 0);
const uint8_t * s2 = s1 + (row != srcHeight - 1 ? srcStride : 0);
vst1_u8(dst, ReduceRow<compensation>(ReduceColNose<align>(s0),
ReduceColNose<align>(s1), ReduceColNose<align>(s2)));
for (size_t srcCol = A, dstCol = HA; srcCol < bodyWidth; srcCol += A, dstCol += HA)
vst1_u8(dst + dstCol, ReduceRow<compensation>(ReduceColBody<align>(s0 + srcCol),
ReduceColBody<align>(s1 + srcCol), ReduceColBody<align>(s2 + srcCol)));
if (bodyWidth != srcWidth)
{
size_t srcCol = srcWidth - A - lastOddCol;
size_t dstCol = dstWidth - HA - lastOddCol;
vst1_u8(dst + dstCol, ReduceRow<compensation>(ReduceColBody<false>(s0 + srcCol),
ReduceColBody<false>(s1 + srcCol), ReduceColBody<false>(s2 + srcCol)));
if (lastOddCol)
dst[dstWidth - 1] = Base::GaussianBlur3x3<compensation>(s0 + srcWidth, s1 + srcWidth, s2 + srcWidth, -2, -1, -1);
}
}
}
template<bool align> void ReduceGray3x3(
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, int compensation)
{
if (compensation)
ReduceGray3x3<align, true>(src, srcWidth, srcHeight, srcStride, dst, dstWidth, dstHeight, dstStride);
else
ReduceGray3x3<align, false>(src, srcWidth, srcHeight, srcStride, dst, dstWidth, dstHeight, dstStride);
}
void ReduceGray3x3(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, int compensation)
{
if (Aligned(src) && Aligned(srcStride))
ReduceGray3x3<true>(src, srcWidth, srcHeight, srcStride, dst, dstWidth, dstHeight, dstStride, compensation);
else
ReduceGray3x3<false>(src, srcWidth, srcHeight, srcStride, dst, dstWidth, dstHeight, dstStride, compensation);
}
}
#endif// SIMD_NEON_ENABLE
}
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