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/*
* Simd Library (http://ermig1979.github.io/Simd).
*
* Copyright (c) 2011-2018 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/SimdMath.h"
namespace Simd
{
namespace Base
{
template <size_t channelCount> void ReduceColor2x2(const uint8_t * src0, const uint8_t * src1, uint8_t * dst);
template <> void ReduceColor2x2<1>(const uint8_t * src0, const uint8_t * src1, uint8_t * dst)
{
dst[0] = Average(src0[0], src0[1], src1[0], src1[1]);
}
template <> void ReduceColor2x2<2>(const uint8_t * src0, const uint8_t * src1, uint8_t * dst)
{
dst[0] = Average(src0[0], src0[2], src1[0], src1[2]);
dst[1] = Average(src0[1], src0[3], src1[1], src1[3]);
}
template <> void ReduceColor2x2<3>(const uint8_t * src0, const uint8_t * src1, uint8_t * dst)
{
dst[0] = Average(src0[0], src0[3], src1[0], src1[3]);
dst[1] = Average(src0[1], src0[4], src1[1], src1[4]);
dst[2] = Average(src0[2], src0[5], src1[2], src1[5]);
}
template <> void ReduceColor2x2<4>(const uint8_t * src0, const uint8_t * src1, uint8_t * dst)
{
dst[0] = Average(src0[0], src0[4], src1[0], src1[4]);
dst[1] = Average(src0[1], src0[5], src1[1], src1[5]);
dst[2] = Average(src0[2], src0[6], src1[2], src1[6]);
dst[3] = Average(src0[3], src0[7], src1[3], src1[7]);
}
template <size_t channelCount> void ReduceColor2x2(const uint8_t * src, size_t srcWidth, size_t srcHeight, size_t srcStride, uint8_t * dst, size_t dstStride)
{
size_t evenWidth = AlignLo(srcWidth, 2);
size_t evenSize = evenWidth * channelCount;
size_t srcStep = 2 * channelCount;
for (size_t srcRow = 0; srcRow < srcHeight; srcRow += 2)
{
const uint8_t * s0 = src;
const uint8_t * s1 = (srcRow == srcHeight - 1 ? src : src + srcStride);
const uint8_t * end = src + evenSize;
uint8_t * d = dst;
for (; s0 < end; s0 += srcStep, s1 += srcStep, d += channelCount)
ReduceColor2x2<channelCount>(s0, s1, d);
if (evenWidth != srcWidth)
{
for(size_t c = 0; c < channelCount; ++c)
d[c] = Average(s0[c], s1[c]);
}
src += 2 * srcStride;
dst += dstStride;
}
}
void ReduceColor2x2(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, size_t channelCount)
{
assert((srcWidth + 1) / 2 == dstWidth && (srcHeight + 1) / 2 == dstHeight);
switch (channelCount)
{
case 1: ReduceColor2x2<1>(src, srcWidth, srcHeight, srcStride, dst, dstStride); break;
case 2: ReduceColor2x2<2>(src, srcWidth, srcHeight, srcStride, dst, dstStride); break;
case 3: ReduceColor2x2<3>(src, srcWidth, srcHeight, srcStride, dst, dstStride); break;
case 4: ReduceColor2x2<4>(src, srcWidth, srcHeight, srcStride, dst, dstStride); break;
default: assert(0);
}
}
}
}
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