/*
 * Copyright (c) 2019-2022 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 "src/cpu/kernels/genproposals/generic/neon/impl.h"
namespace arm_compute
{
class ITensor;
class Window;
namespace cpu
{
template <typename T>
void compute_all_anchors(const ITensor *anchors, ITensor *all_anchors, ComputeAnchorsInfo anchors_info, const Window &window)
{
    Iterator all_anchors_it(all_anchors, window);
    Iterator anchors_it(all_anchors, window);

    const size_t num_anchors = anchors->info()->dimension(1);
    const T      stride      = 1.f / anchors_info.spatial_scale();
    const size_t feat_width  = anchors_info.feat_width();

    execute_window_loop(window, [&](const Coordinates & id)
    {
        const size_t anchor_offset = id.y() % num_anchors;

        const auto out_anchor_ptr = reinterpret_cast<T *>(all_anchors_it.ptr());
        const auto anchor_ptr     = reinterpret_cast<T *>(anchors->ptr_to_element(Coordinates(0, anchor_offset)));

        const size_t shift_idy = id.y() / num_anchors;
        const T      shiftx    = (shift_idy % feat_width) * stride;
        const T      shifty    = (shift_idy / feat_width) * stride;

        *out_anchor_ptr       = *anchor_ptr + shiftx;
        *(out_anchor_ptr + 1) = *(1 + anchor_ptr) + shifty;
        *(out_anchor_ptr + 2) = *(2 + anchor_ptr) + shiftx;
        *(out_anchor_ptr + 3) = *(3 + anchor_ptr) + shifty;
    },
    all_anchors_it);
}

template void compute_all_anchors<float>(const ITensor *anchors, ITensor *all_anchors, ComputeAnchorsInfo anchors_info, const Window &window);
#if defined(__ARM_FEATURE_FP16_VECTOR_ARITHMETIC) && defined(ENABLE_FP16_KERNELS)
template void compute_all_anchors<float16_t>(const ITensor *anchors, ITensor *all_anchors, ComputeAnchorsInfo anchors_info, const Window &window);
#endif //defined(__ARM_FEATURE_FP16_VECTOR_ARITHMETIC) && defined(ENABLE_FP16_KERNELS)

void compute_all_anchors_qasymm16(const ITensor *anchors, ITensor *all_anchors, ComputeAnchorsInfo anchors_info, const Window &window)
{
    Iterator all_anchors_it(all_anchors, window);
    Iterator anchors_it(all_anchors, window);

    const size_t num_anchors = anchors->info()->dimension(1);
    const float  stride      = 1.f / anchors_info.spatial_scale();
    const size_t feat_width  = anchors_info.feat_width();

    const UniformQuantizationInfo qinfo = anchors->info()->quantization_info().uniform();

    execute_window_loop(window, [&](const Coordinates & id)
    {
        const size_t anchor_offset = id.y() % num_anchors;

        const auto out_anchor_ptr = reinterpret_cast<int16_t *>(all_anchors_it.ptr());
        const auto anchor_ptr     = reinterpret_cast<int16_t *>(anchors->ptr_to_element(Coordinates(0, anchor_offset)));

        const size_t shift_idy = id.y() / num_anchors;
        const float  shiftx    = (shift_idy % feat_width) * stride;
        const float  shifty    = (shift_idy / feat_width) * stride;

        const float new_anchor_x1 = dequantize_qsymm16(*anchor_ptr, qinfo.scale) + shiftx;
        const float new_anchor_y1 = dequantize_qsymm16(*(1 + anchor_ptr), qinfo.scale) + shifty;
        const float new_anchor_x2 = dequantize_qsymm16(*(2 + anchor_ptr), qinfo.scale) + shiftx;
        const float new_anchor_y2 = dequantize_qsymm16(*(3 + anchor_ptr), qinfo.scale) + shifty;

        *out_anchor_ptr       = quantize_qsymm16(new_anchor_x1, qinfo.scale);
        *(out_anchor_ptr + 1) = quantize_qsymm16(new_anchor_y1, qinfo.scale);
        *(out_anchor_ptr + 2) = quantize_qsymm16(new_anchor_x2, qinfo.scale);
        *(out_anchor_ptr + 3) = quantize_qsymm16(new_anchor_y2, qinfo.scale);
    },
    all_anchors_it);
}
} // namespace cpu
} // namespace arm_compute
