Function cvPointSeqFromMat

deps/opencv/modules/imgproc/src/utils.cpp:44–76

#include "precomp.hpp"

CV_IMPL CvSeq* cvPointSeqFromMat( int seq_kind, const CvArr* arr,
                                  CvContour* contour_header, CvSeqBlock* block )
{
    CV_Assert( arr != 0 && contour_header != 0 && block != 0 );

    int eltype;
    CvMat hdr;
    CvMat* mat = (CvMat*)arr;

    if( !CV_IS_MAT( mat ))
        CV_Error( CV_StsBadArg, "Input array is not a valid matrix" );

    if( CV_MAT_CN(mat->type) == 1 && mat->width == 2 )
        mat = cvReshape(mat, &hdr, 2);

    eltype = CV_MAT_TYPE( mat->type );
    if( eltype != CV_32SC2 && eltype != CV_32FC2 )
        CV_Error( CV_StsUnsupportedFormat,
        "The matrix can not be converted to point sequence because of "
        "inappropriate element type" );

    if( (mat->width != 1 && mat->height != 1) || !CV_IS_MAT_CONT(mat->type))
        CV_Error( CV_StsBadArg,
        "The matrix converted to point sequence must be "
        "1-dimensional and continuous" );

    cvMakeSeqHeaderForArray(
            (seq_kind & (CV_SEQ_KIND_MASK|CV_SEQ_FLAG_CLOSED)) | eltype,
            sizeof(CvContour), CV_ELEM_SIZE(eltype), mat->data.ptr,
            mat->width*mat->height, (CvSeq*)contour_header, block );

    return (CvSeq*)contour_header;
}

namespace cv
{