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/*
* Copyright (c) 2017-2020 ARM Limited.
*
* SPDX-License-Identifier: MIT
*
* 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 "Erode.h"
#include "Utils.h"
#include "tests/validation/Helpers.h"
#include <algorithm>
#include <array>
namespace arm_compute
{
namespace test
{
namespace validation
{
namespace reference
{
template <typename T>
SimpleTensor<T> erode(const SimpleTensor<T> &src, BorderMode border_mode, T constant_border_value)
{
/*
-1 x +1
-1 [tl][tc][tr] -1
y [ml][xy][mr] y
+1 [bl][bc][br] +1
-1 x +1
erode:
dst(x, y) = min[ src(x', y') for x-1<=x'<=x+1, y-1<=y'<=y+1 ] = min({tl, tc, tr, ml, xy, mr, bl, bc, br})
*/
SimpleTensor<T> dst(src.shape(), src.data_type());
const uint32_t num_elements = src.num_elements();
#if defined(_OPENMP)
#pragma omp parallel for
#endif /* _OPENMP */
for(uint32_t i = 0; i < num_elements; ++i)
{
Coordinates coord = index2coord(src.shape(), i);
const int x = coord.x();
const int y = coord.y();
std::array<T, 9> neighbours = { { 0 } };
for(int row = y - 1, j = 0; row <= y + 1; ++row)
{
for(int col = x - 1; col <= x + 1; ++col, ++j)
{
coord.set(0, col);
coord.set(1, row);
neighbours[j] = tensor_elem_at(src, coord, border_mode, constant_border_value);
}
}
dst[i] = *std::min_element(neighbours.cbegin(), neighbours.cend());
}
return dst;
}
template SimpleTensor<uint8_t> erode(const SimpleTensor<uint8_t> &src, BorderMode border_mode, uint8_t constant_border_value);
} // namespace reference
} // namespace validation
} // namespace test
} // namespace arm_compute
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