Function get_nearest_linear_coord

dnn/src/arm_common/resize/helper.h:89–113

}

static inline std::tuple<float, int, float, int> get_nearest_linear_coord(
        InterpolationMode imode, float scale, int size, int idx) {
    if (size == 1) {
        return std::make_tuple(1.0f, 0, 0.0f, 0);
    }

    float alpha = (idx + 0.5f) / scale - 0.5f;
    int origin_idx = static_cast<int>(floor(alpha));
    alpha -= origin_idx;

    if (imode == InterpolationMode::INTER_NEAREST) {
        origin_idx = get_nearest_src(scale, size, idx);
        alpha = 0;
    }

    if (origin_idx < 0) {
        origin_idx = 0;
        alpha = 0;
    } else if (origin_idx + 1 >= size) {
        origin_idx = size - 2;
        alpha = 1;
    }

    return std::make_tuple(1 - alpha, origin_idx, alpha, origin_idx + 1);
}
};  // namespace resize
};  // namespace arm_common
};  // namespace megdnn