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/*
* Copyright (c) 2017 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 "Phase.h"
namespace arm_compute
{
namespace test
{
namespace validation
{
namespace reference
{
template <typename T>
SimpleTensor<uint8_t> phase(const SimpleTensor<T> &gx, const SimpleTensor<T> &gy, PhaseType phase_type)
{
const float pi = std::atan(1) * 4;
const float rad_to_deg = 180.0f / pi;
const float scale_factor = 128.f / 180.f;
const float epsilon = 1e-9f; // used to avoid division by zero
const float ninety = scale_factor * 90.f;
const float one_eighty = scale_factor * 180.f;
const float two_seventy = scale_factor * 270.f;
// unsigned: map to [0-255)
// signed: map to [0-180) degrees
const float scale = (phase_type == PhaseType::UNSIGNED) ? rad_to_deg : rad_to_deg * scale_factor;
SimpleTensor<uint8_t> phase(gx.shape(), DataType::U8);
for(int i = 0; i < gx.num_elements(); ++i)
{
bool quad_two = std::signbit(gx[i]) && !std::signbit(gy[i]);
bool quad_three = std::signbit(gx[i]) && std::signbit(gy[i]);
bool quad_four = !std::signbit(gx[i]) && std::signbit(gy[i]);
float x = gy[i] / (gx[i] + epsilon);
double arctan = std::atan(x);
const bool is_negative = std::signbit(arctan);
// Radians to degrees conversion with applied scale factor
arctan = arctan * scale;
if(phase_type == PhaseType::UNSIGNED)
{
arctan = is_negative ? arctan + 180.f : arctan;
}
else
{
arctan = is_negative ? arctan + ninety : arctan;
// Choose correct quandrant
arctan = quad_two ? ninety + arctan : arctan;
arctan = quad_three ? one_eighty + arctan : arctan;
arctan = quad_four ? two_seventy + arctan : arctan;
}
phase[i] = saturate_cast<uint8_t>(arctan + 0.5f);
}
return phase;
}
template SimpleTensor<uint8_t> phase(const SimpleTensor<int16_t> &gx, const SimpleTensor<int16_t> &gy, PhaseType phase_type);
template SimpleTensor<uint8_t> phase(const SimpleTensor<int32_t> &gx, const SimpleTensor<int32_t> &gy, PhaseType phase_type);
} // namespace reference
} // namespace validation
} // namespace test
} // namespace arm_compute
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