modules/cannops/src/color.cpp

// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.

#include "precomp.hpp"

namespace cv
{
namespace cann
{
// Integer type images will have a loss of accuracy during calculation, so they must be converted to
// float before calculation.
static AscendMat convertTo(const AscendMat& src, int dtype, AscendStream& stream)
{
    AscendMat ret;
    if (src.depth() != dtype)
        src.convertTo(ret, dtype, stream);
    else
        ret = src;
    return ret;
}

static void convertBack(const AscendMat& src, AscendMat& dst, AscendStream& stream)
{
    if (src.depth() != dst.depth())
        src.convertTo(dst, stream);
}

//! Set alpha channel to a Mat.
static void matAlphaSet(AscendMat& mat, int dtype, AscendStream& stream)
{
    if (dtype < 0)
        dtype = mat.depth();

    if (mat.depth() == CV_8U || mat.depth() == CV_16U)
    {
        size_t size = mat.rows * mat.step;
        aclrtMemsetWarpper(mat.data, 255, size, stream);
    }
    else
    {
        if (dtype == CV_32F)
            mat.setTo(1.0f, stream);
        else
            mat.setTo((dtype == CV_8U ? (1 << 8) : (1 << 16)) - 1, stream);
    }
}

inline void checkImg(const AscendMat& mat)
{
    int depth = mat.depth();
    CV_Assert(!mat.empty());
    CV_Assert(depth == CV_8U || depth == CV_16U || depth == CV_32F);
}

inline void cvtBGRtoBGR(const AscendMat& src, AscendMat& dst, int dcn, bool swapBlue,
                        AscendStream& stream)
{
    checkImg(src);
    CV_Assert(src.channels() == 3 || src.channels() == 4);

    AscendMat matChannels[4];
    split(src, matChannels, stream);

    if (swapBlue)
        std::swap(matChannels[0], matChannels[2]);

    if (dcn == 4 && src.channels() != 4)
    {
        AscendMat& alpha = matChannels[3];
        alpha.create(src.rows, src.cols, CV_MAKE_TYPE(src.depth(), 1));
        matAlphaSet(alpha, -1, stream);
    }

    merge(matChannels, dcn, dst, stream);
}

inline void cvtBGRtoBGR(InputArray& _src, OutputArray& _dst, int dcn, bool swapBlue,
                        AscendStream& stream)
{
    AscendMat src, dst;
    src.upload(_src, stream);
    cvtBGRtoBGR(src, dst, dcn, swapBlue, stream);
    dst.download(_dst, stream);
}

// TODO duplicated code
static const float B2YF = 0.114f;
static const float G2YF = 0.587f;
static const float R2YF = 0.299f;

inline void cvtBGRtoGray(const AscendMat& src, AscendMat& dst, int, bool swapBlue,
                         AscendStream& stream)
{
    checkImg(src);
    CV_Assert(src.channels() == 3 || src.channels() == 4);

    float coeffs[] = {B2YF, G2YF, R2YF};
    dst.create(src.rows, src.cols, CV_MAKE_TYPE(src.depth(), 1));
    AscendMat formatedSrc = convertTo(src, CV_32F, stream);
    AscendMat formatedDst = convertTo(dst, CV_32F, stream);

    // For RGB
    if (swapBlue)
        std::swap(coeffs[0], coeffs[2]);

    Scalar sc = {coeffs[0], coeffs[1], coeffs[2], 0};
    AscendMat grayRet(formatedSrc.rows, formatedSrc.cols, formatedSrc.type());
    arithm_op(formatedSrc, sc, grayRet, "Mul", stream);

    AscendMat matChannels[4];
    split(grayRet, matChannels, stream);

    OperatorRunner runner;
    runner.setOp("AddN")
        .addInput(matChannels[0], "x0")
        .addInput(matChannels[1], "x1")
        .addInput(matChannels[2], "x2")
        .addOutput(formatedDst, "y")
        .addAttr(3, "N")
        .run(stream);

    convertBack(formatedDst, dst, stream);
}

inline void cvtBGRtoGray(const InputArray& _src, OutputArray& _dst, int, bool swapBlue,
                         AscendStream& stream)
{
    AscendMat src, dst;
    src.upload(_src, stream);
    cvtBGRtoGray(src, dst, 0, swapBlue, stream);
    dst.download(_dst, stream);
}

inline void cvtGraytoBGR(const AscendMat& src, AscendMat& dst, int dcn, bool, AscendStream& stream)
{
    checkImg(src);
    CV_Assert(src.channels() == 1);

    AscendMat matChannels[4];
    for (int i = 0; i < 3; i++)
        matChannels[i] = src;

    if (dcn == 4)
    {
        AscendMat& alpha = matChannels[3];
        alpha.create(src.rows, src.cols, CV_MAKE_TYPE(src.depth(), 1));
        matAlphaSet(alpha, -1, stream);
    }

    merge(matChannels, dcn, dst, stream);
}

inline void cvtGraytoBGR(const InputArray& _src, OutputArray& _dst, int dcn, bool,
                         AscendStream& stream)
{
    AscendMat src, dst;
    src.upload(_src, stream);
    cvtGraytoBGR(src, dst, dcn, false, stream);
    dst.download(_dst, stream);
}

static const float RGB2XYZ_D65[] = {0.412453, 0.357580, 0.180423, 0.212671, 0.715160,
                                    0.072169, 0.019334, 0.119193, 0.950227};

static const float XYZ2RGB_D65[] = {3.240479, -1.53715, -0.498535, -0.969256, 1.875991,
                                    0.041556, 0.055648, -0.204043, 1.057311};

inline void matMulRGB(const AscendMat& src, AscendMat& dst, float* matrix, AscendStream& stream)
{
    checkImg(src);
    CV_Assert(src.channels() == 3);

    dst.create(src.rows, src.cols, src.type());
    AscendMat formatedSrc = convertTo(src, CV_32F, stream);
    AscendMat formatedDst = convertTo(dst, CV_32F, stream);

    int64_t dims[] = {3, 3};
    OperatorRunner runner;
    runner.setOp("BatchMatMulV2")
        .addInput(formatedSrc, "x1")
        .addInput<float>(matrix, dims, 2, getACLType(CV_32F), "x2")
        .addOutput(formatedDst, "y")
        .addAttr(false, "adj_x1")
        .addAttr(true, "adj_x2")
        .run(stream);

    if (src.depth() != CV_32F)
    {
        AscendMat thresholdTempMat(formatedSrc.size(), formatedSrc.type());
        uint16_t thresh = (src.depth() == CV_8U ? (1 << 8) : (1 << 16)) - 1;
        threshold(formatedDst, thresholdTempMat, thresh, 0, 2 /*THRESH_TRUNC*/, stream);
        threshold(thresholdTempMat, formatedDst, 0, 0, 3 /*THRESH_TOZERO*/, stream);
    }

    convertBack(formatedDst, dst, stream);
}

// TODO: should deal with overflow. set 255 instead of cut off.
inline void cvtBGRtoXYZ(const AscendMat& src, AscendMat& dst, int, bool swapBlue,
                        AscendStream& stream)
{
    float coeffs[9];
    memcpy(coeffs, RGB2XYZ_D65, 9 * sizeof(float));
    if (!swapBlue)
    {
        std::swap(coeffs[0], coeffs[2]);
        std::swap(coeffs[3], coeffs[5]);
        std::swap(coeffs[6], coeffs[8]);
    }
    matMulRGB(src, dst, coeffs, stream);
}

inline void cvtBGRtoXYZ(const InputArray& _src, OutputArray& _dst, int, bool swapBlue,
                        AscendStream& stream)
{
    AscendMat src, dst;
    src.upload(_src, stream);
    cvtBGRtoXYZ(src, dst, 0, swapBlue, stream);
    dst.download(_dst, stream);
}

inline void cvtXYZtoBGR(const AscendMat& src, AscendMat& dst, int dcn, bool swapBlue,
                        AscendStream& stream)
{
    float coeffs[9];
    memcpy(coeffs, XYZ2RGB_D65, 9 * sizeof(float));
    if (!swapBlue)
    {
        std::swap(coeffs[0], coeffs[6]);
        std::swap(coeffs[1], coeffs[7]);
        std::swap(coeffs[2], coeffs[8]);
    }

    if (dcn == 4)
    {
        AscendMat tempMat[2];
        matMulRGB(src, tempMat[0], coeffs, stream);
        tempMat[1].create(tempMat[0].rows, tempMat[0].cols, CV_MAKE_TYPE(tempMat[0].depth(), 1));
        matAlphaSet(tempMat[1], -1, stream);
        merge(tempMat, 2, dst, stream);
    }
    else
        matMulRGB(src, dst, coeffs, stream);
}

inline void cvtXYZtoBGR(const InputArray& _src, OutputArray& _dst, int dcn, bool swapBlue,
                        AscendStream& stream)
{
    AscendMat src, dst;
    src.upload(_src, stream);
    cvtXYZtoBGR(src, dst, dcn, swapBlue, stream);
    dst.download(_dst, stream);
}

// TODO duplicated code
static const float YCRF = 0.713f;
static const float YCBF = 0.564f;
static const float R2VF = 0.877f;
static const float B2UF = 0.492f;
inline void cvtBGRtoYCrCb(const AscendMat& src, AscendMat& dst, float* coeffs, bool swapBlue,
                          bool yuvOrder, AscendStream& stream)
{
    checkImg(src);
    CV_Assert(src.channels() == 3);

    int buleIdx = swapBlue ? 2 : 0;
    int depth = src.depth();
    float delta = (depth == CV_8U) ? 128 : ((depth == CV_16U) ? 32768 : 0.5);

    dst.create(src.rows, src.cols, src.type());
    AscendMat formatedSrc = convertTo(src, CV_32F, stream);
    AscendMat formatedDst = convertTo(dst, CV_32F, stream);

    AscendMat YCrCb[3], RGB[3];
    split(formatedSrc, RGB, stream);
    cvtBGRtoGray(formatedSrc, YCrCb[0], 1, swapBlue, stream);
    YCrCb[1].create(YCrCb[0].rows, YCrCb[0].cols, YCrCb[0].type());
    YCrCb[2].create(YCrCb[0].rows, YCrCb[0].cols, YCrCb[0].type());

    AscendMat tempMat1(formatedSrc.size(), CV_MAKE_TYPE(formatedSrc.depth(), 1)),
        tempMat2(formatedSrc.size(), CV_MAKE_TYPE(formatedSrc.depth(), 1));

    arithm_op(RGB[buleIdx ^ 2], YCrCb[0], tempMat1, "Sub", stream);
    arithm_op(tempMat1, coeffs[0], tempMat2, "Muls", stream);
    arithm_op(tempMat2, delta, YCrCb[1], "Adds", stream);

    arithm_op(RGB[buleIdx], YCrCb[0], tempMat1, "Sub", stream);
    arithm_op(tempMat1, coeffs[1], tempMat2, "Muls", stream);
    arithm_op(tempMat2, delta, YCrCb[2], "Adds", stream);

    if (yuvOrder)
        std::swap(YCrCb[1], YCrCb[2]);

    merge(YCrCb, 3, formatedDst, stream);
    if (src.depth() != CV_32F)
    {
        AscendMat thresholdTempMat(formatedSrc.size(), formatedSrc.type());
        uint16_t thresh = (src.depth() == CV_8U ? (1 << 8) : (1 << 16)) - 1;
        threshold(formatedDst, thresholdTempMat, thresh, 0, 2 /*THRESH_TRUNC*/, stream);
        threshold(thresholdTempMat, formatedDst, 0, 0, 3 /*THRESH_TOZERO*/, stream);
    }

    convertBack(formatedDst, dst, stream);
}

inline void cvtBGRtoYCrCb(const InputArray& _src, OutputArray& _dst, float* coeffs, bool swapBlue,
                          bool yuvOrder, AscendStream& stream)
{
    AscendMat src, dst;
    src.upload(_src, stream);
    cvtBGRtoYCrCb(src, dst, coeffs, swapBlue, yuvOrder, stream);
    dst.download(_dst, stream);
}

static const float CR2RF = 1.403f;
static const float CR2GF = -0.714f;
static const float CB2GF = -0.344f;
static const float CB2BF = 1.773f;

static const float V2RF = 1.140f;
static const float V2GF = -0.581f;
static const float U2GF = -0.395f;
static const float U2BF = 2.032f;

inline void cvtYCrCbtoBGR(const AscendMat& src, AscendMat& dst, int dcn, float* coeffs,
                          bool swapBlue, bool yuvOrder, AscendStream& stream)
{
    checkImg(src);
    CV_Assert(src.channels() == 3);

    int buleIdx = swapBlue ? 2 : 0;
    int depth = src.depth();
    float delta = (depth == CV_8U) ? 128 : ((depth == CV_16U) ? 32768 : 0.5);

    dst.create(src.rows, src.cols, CV_MAKE_TYPE(src.depth(), dcn));
    AscendMat formatedSrc = convertTo(src, CV_32F, stream);
    AscendMat formatedDst = convertTo(dst, CV_32F, stream);

    AscendMat YCrCb[3], RGB[4];
    split(formatedSrc, YCrCb, stream);
    if (yuvOrder)
        std::swap(YCrCb[1], YCrCb[2]);

    RGB[0].create(formatedSrc.rows, formatedSrc.cols, CV_MAKE_TYPE(formatedSrc.depth(), 1));
    RGB[1].create(formatedSrc.rows, formatedSrc.cols, CV_MAKE_TYPE(formatedSrc.depth(), 1));
    RGB[2].create(formatedSrc.rows, formatedSrc.cols, CV_MAKE_TYPE(formatedSrc.depth(), 1));
    AscendMat tempMat1(formatedSrc.size(), CV_MAKE_TYPE(formatedSrc.depth(), 1)),
        tempMat2(formatedSrc.size(), CV_MAKE_TYPE(formatedSrc.depth(), 1)),
        CbSubDelta(formatedSrc.size(), CV_MAKE_TYPE(formatedSrc.depth(), 1)),
        CrSubDelta(formatedSrc.size(), CV_MAKE_TYPE(formatedSrc.depth(), 1));

    arithm_op(YCrCb[1], (0.0f - delta), CrSubDelta, "Adds", stream);
    arithm_op(YCrCb[2], (0.0f - delta), CbSubDelta, "Adds", stream);
    arithm_op(CrSubDelta, coeffs[0], tempMat1, "Muls", stream);
    arithm_op(YCrCb[0], tempMat1, RGB[buleIdx ^ 2], "Add", stream);

    arithm_op(CrSubDelta, coeffs[1], tempMat1, "Muls", stream);
    arithm_op(YCrCb[0], tempMat1, tempMat2, "Add", stream);
    arithm_op(CbSubDelta, coeffs[2], tempMat1, "Muls", stream);
    arithm_op(tempMat2, tempMat1, RGB[1], "Add", stream);

    arithm_op(CbSubDelta, coeffs[3], tempMat1, "Muls", stream);
    arithm_op(YCrCb[0], tempMat1, RGB[buleIdx], "Add", stream);

    if (dcn == 4)
    {
        RGB[3].create(RGB[0].rows, RGB[0].cols, RGB[0].type());
        matAlphaSet(RGB[3], src.depth(), stream);
    }

    merge(RGB, dcn, formatedDst, stream);
    if (src.depth() != CV_32F)
    {
        AscendMat thresholdTempMat(formatedSrc.size(), CV_MAKE_TYPE(formatedSrc.depth(), dcn));
        uint16_t thresh = (src.depth() == CV_8U ? (1 << 8) : (1 << 16)) - 1;
        threshold(formatedDst, thresholdTempMat, thresh, 0, 2 /*THRESH_TRUNC*/, stream);
        threshold(thresholdTempMat, formatedDst, 0, 0, 3 /*THRESH_TOZERO*/, stream);
    }

    convertBack(formatedDst, dst, stream);
}

inline void cvtYCrCbtoBGR(const InputArray& _src, OutputArray& _dst, int dcn, float* coeffs,
                          bool swapBlue, bool yuvOrder, AscendStream& stream)
{
    AscendMat src, dst;
    src.upload(_src, stream);
    cvtYCrCbtoBGR(src, dst, dcn, coeffs, swapBlue, yuvOrder, stream);
    dst.download(_dst, stream);
}

// The input may be Input/OutputArray or AscendMat. Use templates to reduce duplicate code.
template <typename SRC, typename DST>
inline void BGR2BGRA(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtBGRtoBGR(src, dst, 4, false, stream);
}

template <typename SRC, typename DST>
inline void BGRA2BGR(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtBGRtoBGR(src, dst, 3, false, stream);
}

template <typename SRC, typename DST>
inline void BGR2RGBA(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtBGRtoBGR(src, dst, 4, true, stream);
}

template <typename SRC, typename DST>
inline void RGBA2BGR(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtBGRtoBGR(src, dst, 3, true, stream);
}

template <typename SRC, typename DST>
inline void BGR2RGB(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtBGRtoBGR(src, dst, 3, true, stream);
}

template <typename SRC, typename DST>
inline void BGRA2RGBA(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtBGRtoBGR(src, dst, 4, true, stream);
}

template <typename SRC, typename DST>
inline void BGR2GRAY(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtBGRtoGray(src, dst, 1, false, stream);
}

template <typename SRC, typename DST>
inline void RGB2GRAY(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtBGRtoGray(src, dst, 1, true, stream);
}

template <typename SRC, typename DST>
inline void GRAY2BGR(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtGraytoBGR(src, dst, 3, false, stream);
}

template <typename SRC, typename DST>
inline void GRAY2BGRA(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtGraytoBGR(src, dst, 4, false, stream);
}

template <typename SRC, typename DST>
inline void BGRA2GRAY(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtBGRtoGray(src, dst, 1, false, stream);
}

template <typename SRC, typename DST>
inline void RGBA2GRAY(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtBGRtoGray(src, dst, 1, true, stream);
}

template <typename SRC, typename DST>
inline void BGR2XYZ(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtBGRtoXYZ(src, dst, 3, false, stream);
}

template <typename SRC, typename DST>
inline void RGB2XYZ(const SRC& src, DST& dst, int, AscendStream& stream)
{
    cvtBGRtoXYZ(src, dst, 3, true, stream);
}

template <typename SRC, typename DST>
inline void XYZ2BGR(const SRC& src, DST& dst, int dcn, AscendStream& stream)
{
    if (dcn <= 0)
        dcn = 3;
    cvtXYZtoBGR(src, dst, dcn, false, stream);
}

template <typename SRC, typename DST>
inline void XYZ2RGB(const SRC& src, DST& dst, int dcn, AscendStream& stream)
{
    if (dcn <= 0)
        dcn = 3;
    cvtXYZtoBGR(src, dst, dcn, true, stream);
}

template <typename SRC, typename DST>
inline void BGR2YCrCb(const SRC& src, DST& dst, int, AscendStream& stream)
{
    float coeffs[2];
    coeffs[0] = YCRF;
    coeffs[1] = YCBF;
    cvtBGRtoYCrCb(src, dst, coeffs, false, false, stream);
}

template <typename SRC, typename DST>
inline void RGB2YCrCb(const SRC& src, DST& dst, int, AscendStream& stream)
{
    float coeffs[2];
    coeffs[0] = YCRF;
    coeffs[1] = YCBF;
    cvtBGRtoYCrCb(src, dst, coeffs, true, false, stream);
}

template <typename SRC, typename DST>
inline void YCrCb2BGR(const SRC& src, DST& dst, int dcn, AscendStream& stream)
{
    float coeffs[4];
    coeffs[0] = CR2RF;
    coeffs[1] = CR2GF;
    coeffs[2] = CB2GF;
    coeffs[3] = CB2BF;
    if (dcn <= 0)
        dcn = 3;
    cvtYCrCbtoBGR(src, dst, dcn, coeffs, false, false, stream);
}

template <typename SRC, typename DST>
inline void YCrCb2RGB(const SRC& src, DST& dst, int dcn, AscendStream& stream)
{
    float coeffs[4];
    coeffs[0] = CR2RF;
    coeffs[1] = CR2GF;
    coeffs[2] = CB2GF;
    coeffs[3] = CB2BF;
    if (dcn <= 0)
        dcn = 3;
    cvtYCrCbtoBGR(src, dst, dcn, coeffs, true, false, stream);
}

template <typename SRC, typename DST>
inline void BGR2YUV(const SRC& src, DST& dst, int, AscendStream& stream)
{
    float coeffs[2];
    coeffs[0] = R2VF;
    coeffs[1] = B2UF;
    cvtBGRtoYCrCb(src, dst, coeffs, false, true, stream);
}

template <typename SRC, typename DST>
inline void RGB2YUV(const SRC& src, DST& dst, int, AscendStream& stream)
{
    float coeffs[2];
    coeffs[0] = R2VF;
    coeffs[1] = B2UF;
    cvtBGRtoYCrCb(src, dst, coeffs, true, true, stream);
}

template <typename SRC, typename DST>
inline void YUV2BGR(const SRC& src, DST& dst, int dcn, AscendStream& stream)
{
    float coeffs[4];
    coeffs[0] = V2RF;
    coeffs[1] = V2GF;
    coeffs[2] = U2GF;
    coeffs[3] = U2BF;
    if (dcn <= 0)
        dcn = 3;
    cvtYCrCbtoBGR(src, dst, dcn, coeffs, false, true, stream);
}

template <typename SRC, typename DST>
inline void YUV2RGB(const SRC& src, DST& dst, int dcn, AscendStream& stream)
{
    float coeffs[4];
    coeffs[0] = V2RF;
    coeffs[1] = V2GF;
    coeffs[2] = U2GF;
    coeffs[3] = U2BF;
    if (dcn <= 0)
        dcn = 3;
    cvtYCrCbtoBGR(src, dst, dcn, coeffs, true, true, stream);
}

template <typename SRC, typename DST>
void cvtColorDo(const SRC& src, DST& dst, int code, int dcn, AscendStream& stream)
{
    typedef void (*func_t)(const SRC& src, DST& dst, int dcn, AscendStream& stream);
    static const func_t funcs[] = {
        BGR2BGRA,  // CV_BGR2BGRA    =0
        BGRA2BGR,  // CV_BGRA2BGR    =1
        BGR2RGBA,  // CV_BGR2RGBA    =2
        RGBA2BGR,  // CV_RGBA2BGR    =3
        BGR2RGB,   // CV_BGR2RGB     =4
        BGRA2RGBA, // CV_BGRA2RGBA   =5

        BGR2GRAY,  // CV_BGR2GRAY    =6
        RGB2GRAY,  // CV_RGB2GRAY    =7
        GRAY2BGR,  // CV_GRAY2BGR    =8
        GRAY2BGRA, // CV_GRAY2BGRA   =9
        BGRA2GRAY, // CV_BGRA2GRAY   =10
        RGBA2GRAY, // CV_RGBA2GRAY   =11

        0, // CV_BGR2BGR565  =12
        0, // CV_RGB2BGR565  =13
        0, // CV_BGR5652BGR  =14
        0, // CV_BGR5652RGB  =15
        0, // CV_BGRA2BGR565 =16
        0, // CV_RGBA2BGR565 =17
        0, // CV_BGR5652BGRA =18
        0, // CV_BGR5652RGBA =19

        0, // CV_GRAY2BGR565 =20
        0, // CV_BGR5652GRAY =21

        0, // CV_BGR2BGR555  =22
        0, // CV_RGB2BGR555  =23
        0, // CV_BGR5552BGR  =24
        0, // CV_BGR5552RGB  =25
        0, // CV_BGRA2BGR555 =26
        0, // CV_RGBA2BGR555 =27
        0, // CV_BGR5552BGRA =28
        0, // CV_BGR5552RGBA =29

        0, // CV_GRAY2BGR555 =30
        0, // CV_BGR5552GRAY =31

        BGR2XYZ, // CV_BGR2XYZ     =32
        RGB2XYZ, // CV_RGB2XYZ     =33
        XYZ2BGR, // CV_XYZ2BGR     =34
        XYZ2RGB, // CV_XYZ2RGB     =35

        BGR2YCrCb, // CV_BGR2YCrCb   =36
        RGB2YCrCb, // CV_RGB2YCrCb   =37
        YCrCb2BGR, // CV_YCrCb2BGR   =38
        YCrCb2RGB, // CV_YCrCb2RGB   =39

        0, // CV_BGR2HSV     =40
        0, // CV_RGB2HSV     =41

        0, //                =42
        0, //                =43

        0, // CV_BGR2Lab     =44
        0, // CV_RGB2Lab     =45

        0, // CV_BayerBG2BGR =46
        0, // CV_BayeRGB2BGR =47
        0, // CV_BayerRG2BGR =48
        0, // CV_BayerGR2BGR =49

        0, // CV_BGR2Luv     =50
        0, // CV_RGB2Luv     =51

        0, // CV_BGR2HLS     =52
        0, // CV_RGB2HLS     =53

        0, // CV_HSV2BGR     =54
        0, // CV_HSV2RGB     =55

        0, // CV_Lab2BGR     =56
        0, // CV_Lab2RGB     =57
        0, // CV_Luv2BGR     =58
        0, // CV_Luv2RGB     =59

        0, // CV_HLS2BGR     =60
        0, // CV_HLS2RGB     =61

        0, // CV_BayerBG2BGR_VNG =62
        0, // CV_BayeRGB2BGR_VNG =63
        0, // CV_BayerRG2BGR_VNG =64
        0, // CV_BayerGR2BGR_VNG =65

        0, // CV_BGR2HSV_FULL = 66
        0, // CV_RGB2HSV_FULL = 67
        0, // CV_BGR2HLS_FULL = 68
        0, // CV_RGB2HLS_FULL = 69

        0, // CV_HSV2BGR_FULL = 70
        0, // CV_HSV2RGB_FULL = 71
        0, // CV_HLS2BGR_FULL = 72
        0, // CV_HLS2RGB_FULL = 73

        0, // CV_LBGR2Lab     = 74
        0, // CV_LRGB2Lab     = 75
        0, // CV_LBGR2Luv     = 76
        0, // CV_LRGB2Luv     = 77

        0, // CV_Lab2LBGR     = 78
        0, // CV_Lab2LRGB     = 79
        0, // CV_Luv2LBGR     = 80
        0, // CV_Luv2LRGB     = 81

        BGR2YUV, // CV_BGR2YUV      = 82
        RGB2YUV, // CV_RGB2YUV      = 83
        YUV2BGR, // CV_YUV2BGR      = 84
        YUV2RGB, // CV_YUV2RGB      = 85

        0, // CV_BayerBG2GRAY = 86
        0, // CV_BayeRGB2GRAY = 87
        0, // CV_BayerRG2GRAY = 88
        0, // CV_BayerGR2GRAY = 89

        // YUV 4:2:0 formats family
        0, // CV_YUV2RGB_NV12 = 90,
        0, // CV_YUV2BGR_NV12 = 91,
        0, // CV_YUV2RGB_NV21 = 92,
        0, // CV_YUV2BGR_NV21 = 93,

        0, // CV_YUV2RGBA_NV12 = 94,
        0, // CV_YUV2BGRA_NV12 = 95,
        0, // CV_YUV2RGBA_NV21 = 96,
        0, // CV_YUV2BGRA_NV21 = 97,

        0, // CV_YUV2RGB_YV12 = 98,
        0, // CV_YUV2BGR_YV12 = 99,
        0, // CV_YUV2RGB_IYUV = 100,
        0, // CV_YUV2BGR_IYUV = 101,

        0, // CV_YUV2RGBA_YV12 = 102,
        0, // CV_YUV2BGRA_YV12 = 103,
        0, // CV_YUV2RGBA_IYUV = 104,
        0, // CV_YUV2BGRA_IYUV = 105,

        0, // CV_YUV2GRAY_420 = 106,

        // YUV 4:2:2 formats family
        0, // CV_YUV2RGB_UYVY = 107,
        0, // CV_YUV2BGR_UYVY = 108,
        0, // //CV_YUV2RGB_VYUY = 109,
        0, // //CV_YUV2BGR_VYUY = 110,

        0, // CV_YUV2RGBA_UYVY = 111,
        0, // CV_YUV2BGRA_UYVY = 112,
        0, // //CV_YUV2RGBA_VYUY = 113,
        0, // //CV_YUV2BGRA_VYUY = 114,

        0, // CV_YUV2RGB_YUY2 = 115,
        0, // CV_YUV2BGR_YUY2 = 116,
        0, // CV_YUV2RGB_YVYU = 117,
        0, // CV_YUV2BGR_YVYU = 118,

        0, // CV_YUV2RGBA_YUY2 = 119,
        0, // CV_YUV2BGRA_YUY2 = 120,
        0, // CV_YUV2RGBA_YVYU = 121,
        0, // CV_YUV2BGRA_YVYU = 122,

        0, // CV_YUV2GRAY_UYVY = 123,
        0, // CV_YUV2GRAY_YUY2 = 124,

        // alpha premultiplication
        0, // CV_RGBA2mRGBA = 125,
        0, // CV_mRGBA2RGBA = 126,

        0, // CV_COLORCVT_MAX  = 127
    };

    CV_Assert(code < 128);

    func_t func = funcs[code];

    if (func == 0)
        CV_Error(Error::StsBadFlag, "Unknown/unsupported color conversion code");

    func(src, dst, dcn, stream);
}

// Instantiate templates to avoid confusion in python code generation
void cvtColor(const InputArray src, OutputArray dst, int code, int dcn, AscendStream& stream)
{
    cvtColorDo(src, dst, code, dcn, stream);
}

void cvtColor(const AscendMat& src, AscendMat& dst, int code, int dcn, AscendStream& stream)
{
    cvtColorDo(src, dst, code, dcn, stream);
}

} // namespace cann
} // namespace cv