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/*
* Simd Library (http://ermig1979.github.io/Simd).
*
* Copyright (c) 2011-2019 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
{
SIMD_INLINE uint8x8_t Average(const uint8x16_t & s0, const uint8x16_t & s1)
{
return vshrn_n_u16(vaddq_u16(vaddq_u16(vpaddlq_u8(s0), vpaddlq_u8(s1)), vdupq_n_u16(2)), 2);
}
template <bool align> SIMD_INLINE void ReduceGray2x2(const uint8_t * src0, const uint8_t * src1, uint8_t * dst)
{
uint8x8x2_t _dst;
_dst.val[0] = Average(Load<align>(src0 + 0), Load<align>(src1 + 0));
_dst.val[1] = Average(Load<align>(src0 + A), Load<align>(src1 + A));
Store<align>(dst, *(uint8x16_t*)&_dst);
}
template <bool align> SIMD_INLINE void ReduceGray2x2(const uint8_t * src0, const uint8_t * src1, size_t size, uint8_t * dst)
{
for (size_t i = 0; i < size; i += DA, src0 += DA, src1 += DA, dst += A)
ReduceGray2x2<align>(src0, src1, dst);
}
#if defined(SIMD_NEON_ASM_ENABLE) && 0
template <> void ReduceGray2x2<true>(const uint8_t * src0, const uint8_t * src1, size_t size, uint8_t * dst)
{
asm(
"mov r4, #2 \n"
"vdup.u16 q4, r4 \n"
"mov r5, %0 \n"
"mov r6, %1 \n"
"mov r4, %2 \n"
"mov r7, %3 \n"
".loop: \n"
"vld1.8 {q0}, [r5:128]! \n"
"vld1.8 {q2}, [r6:128]! \n"
"vpaddl.u8 q0, q0 \n"
"vpadal.u8 q0, q2 \n"
"vadd.u16 q0, q0, q4 \n"
"vshrn.u16 d10, q0, #2 \n"
"vld1.8 {q1}, [r5:128]! \n"
"vld1.8 {q3}, [r6:128]! \n"
"vpaddl.u8 q1, q1 \n"
"vpadal.u8 q1, q3 \n"
"vadd.u16 q1, q1, q4 \n"
"vshrn.u16 d11, q1, #2 \n"
"vst1.8 {q5}, [r7:128]! \n"
"subs r4, r4, #32 \n"
"bne .loop \n"
:
: "r"(src0), "r"(src1), "r" (size), "r"(dst)
: "q0", "q1", "q2", "q3", "q4", "q5", "r4", "r5", "r6", "r7", "memory"
);
}
#endif
template <bool align> void ReduceGray2x2(
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 >= DA);
if (align)
{
assert(Aligned(src) && Aligned(srcStride));
assert(Aligned(dst) && Aligned(dstStride));
}
size_t alignedWidth = AlignLo(srcWidth, DA);
size_t evenWidth = AlignLo(srcWidth, 2);
for (size_t srcRow = 0; srcRow < srcHeight; srcRow += 2)
{
const uint8_t * src0 = src;
const uint8_t * src1 = (srcRow == srcHeight - 1 ? src : src + srcStride);
ReduceGray2x2<align>(src0, src1, alignedWidth, dst);
if (alignedWidth != srcWidth)
{
size_t dstOffset = dstWidth - A - (evenWidth != srcWidth ? 1 : 0);
size_t srcOffset = evenWidth - DA;
ReduceGray2x2<false>(src0 + srcOffset, src1 + srcOffset, dst + dstOffset);
if (evenWidth != srcWidth)
dst[dstWidth - 1] = Base::Average(src0[evenWidth], src1[evenWidth]);
}
src += 2 * srcStride;
dst += dstStride;
}
}
void ReduceGray2x2(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(src) && Aligned(srcStride) && Aligned(dst) && Aligned(dstStride))
ReduceGray2x2<true>(src, srcWidth, srcHeight, srcStride, dst, dstWidth, dstHeight, dstStride);
else
ReduceGray2x2<false>(src, srcWidth, srcHeight, srcStride, dst, dstWidth, dstHeight, dstStride);
}
}
#endif// SIMD_NEON_ENABLE
}
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