Program Listing for File xf_convert_bitdepth.hpp

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/*
 * Copyright 2019 Xilinx, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _XF_CONVERT_BITDEPTH_HPP_
#define _XF_CONVERT_BITDEPTH_HPP_

#ifndef __cplusplus
#error C++ is needed to include this header
#endif

#include "hls_stream.h"
#include "../common/xf_common.hpp"

namespace xf {
namespace cv {
template <int SRC_T,
          int DST_T,
          int ROWS,
          int COLS,
          int DEPTH_SRC,
          int DEPTH_DST,
          int WORDWIDTH_SRC,
          int WORDWIDTH_DST,
          int NPC,
          int TRIP_CNT>
void xfConvertBitDepthKernel(xf::cv::Mat<SRC_T, ROWS, COLS, NPC>& _src_mat,
                             xf::cv::Mat<DST_T, ROWS, COLS, NPC>& _dst_mat,
                             ap_uint<4> _convert_type,
                             int _shift,
                             unsigned short _height,
                             unsigned short _width) {
    XF_SNAME(WORDWIDTH_SRC) buf;
    XF_SNAME(WORDWIDTH_DST) result;
    int min, max;
    ap_uint<13> col, row;
    ap_uint<10> j, k, i;
    ap_uint<10> out_step, in_step;
    if (DEPTH_DST == XF_8UP) {
        min = 0;
        max = 255;
    } else if (DEPTH_DST == XF_16UP) {
        min = 0;
        max = 65535;
    } else if (DEPTH_DST == XF_16SP) {
        min = -32768;
        max = 32767;
    } else if (DEPTH_DST == XF_32SP) {
        min = -2147483648;
        max = 2147483647;
    }

ROW_LOOP:
    for (row = 0; row < _height; row++) {
// clang-format off
        #pragma HLS LOOP_TRIPCOUNT min=ROWS max=ROWS
    // clang-format on

    COL_LOOP:
        for (col = 0; col < _width; col++) {
// clang-format off
            #pragma HLS LOOP_TRIPCOUNT min=TRIP_CNT max=TRIP_CNT
            #pragma HLS LOOP_FLATTEN off
            #pragma HLS pipeline
            // clang-format on

            buf = (XF_SNAME(WORDWIDTH_SRC))(_src_mat.read(row * _width + col));
            out_step = XF_PIXELDEPTH(DEPTH_DST), in_step = XF_PIXELDEPTH(DEPTH_SRC);

        Extract:
            for (j = 0, k = 0, i = 0; j < (1 << XF_BITSHIFT(NPC)); j++, k += in_step, i += out_step) {
// clang-format off
                #pragma HLS UNROLL
                // clang-format on

                XF_PTNAME(DEPTH_SRC) val = buf.range(k + (in_step - 1), k);

                if (_convert_type == XF_CONVERT_16U_TO_8U || _convert_type == XF_CONVERT_16S_TO_8U ||
                    _convert_type == XF_CONVERT_32S_TO_8U || _convert_type == XF_CONVERT_32S_TO_16U ||
                    _convert_type == XF_CONVERT_32S_TO_16S) {
                    val = val >> _shift;
                    if (val < min) val = min;
                    if (val > max) val = max;
                    result(i + (out_step - 1), i) = (XF_PTNAME(DEPTH_DST))val;
                } else {
                    if (((XF_PTNAME(DEPTH_DST))val << _shift) > max)
                        result(i + (out_step - 1), i) = max;
                    else if (((XF_PTNAME(DEPTH_DST))val << _shift) < min)
                        result(i + (out_step - 1), i) = min;
                    else
                        result(i + (out_step - 1), i) = (XF_PTNAME(DEPTH_DST))val << _shift;
                }
            }
            _dst_mat.write(row * _width + col, (XF_SNAME(WORDWIDTH_DST))result);
        }
    }
}

template <int SRC_T, int DST_T, int ROWS, int COLS, int NPC = 1>
void convertTo(xf::cv::Mat<SRC_T, ROWS, COLS, NPC>& _src_mat,
               xf::cv::Mat<DST_T, ROWS, COLS, NPC>& _dst_mat,
               ap_uint<4> _convert_type,
               int _shift) {
    assert(((NPC == XF_NPPC1) || (NPC == XF_NPPC8)) && "NPC must be XF_NPPC1 or XF_NPPC8 ");
    assert(((_src_mat.rows <= ROWS) && (_src_mat.cols <= COLS)) && "ROWS and COLS should be greater than input image");
    assert(((_dst_mat.rows <= ROWS) && (_dst_mat.cols <= COLS)) && "ROWS and COLS should be greater than input image");

    assert((((_convert_type == XF_CONVERT_16U_TO_8U) || (_convert_type == XF_CONVERT_16S_TO_8U) ||
             (_convert_type == XF_CONVERT_32S_TO_8U) || (_convert_type == XF_CONVERT_32S_TO_16S) ||
             (_convert_type == XF_CONVERT_32S_TO_16U) || (_convert_type == XF_CONVERT_8U_TO_16U) ||
             (_convert_type == XF_CONVERT_8U_TO_16S) || (_convert_type == XF_CONVERT_8U_TO_32S) ||
             (_convert_type == XF_CONVERT_16U_TO_32S) || (_convert_type == XF_CONVERT_16S_TO_32S)) &&
            " conversion type is not valid "));

// clang-format off
    #pragma HLS INLINE OFF
    // clang-format on

    uint16_t width = _src_mat.cols >> (XF_BITSHIFT(NPC));
    uint16_t height = _src_mat.rows;

    xfConvertBitDepthKernel<SRC_T, DST_T, ROWS, COLS, XF_DEPTH(SRC_T, NPC), XF_DEPTH(DST_T, NPC),
                            XF_WORDWIDTH(SRC_T, NPC), XF_WORDWIDTH(DST_T, NPC), NPC, (COLS >> XF_BITSHIFT(NPC))>(
        _src_mat, _dst_mat, _convert_type, _shift, height, width);
}
} // namespace cv
} // namespace xf

#endif // _XF_CONVERT_BITDEPTH_HPP_