opencv/modules/imgproc/src/utils.cpp

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#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* mat = (CvMat*)arr;
    
    if( !CV_IS_MAT( mat ))
        CV_Error( CV_StsBadArg, "Input array is not a valid matrix" ); 

    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
{

static void copyMakeBorder_8u( const uchar* src, size_t srcstep, Size srcroi,
                               uchar* dst, size_t dststep, Size dstroi,
                               int top, int left, int cn, int borderType )
{
    const int isz = (int)sizeof(int);
    int i, j, k, elemSize = 1;
    bool intMode = false;

    if( (cn | srcstep | dststep | (size_t)src | (size_t)dst) % isz == 0 )
    {
        cn /= isz;
        elemSize = isz;
        intMode = true;
    }

    AutoBuffer<int> _tab((dstroi.width - srcroi.width)*cn);
    int* tab = _tab;
    int right = dstroi.width - srcroi.width - left;
    int bottom = dstroi.height - srcroi.height - top;
    
    for( i = 0; i < left; i++ )
    {
        j = borderInterpolate(i - left, srcroi.width, borderType)*cn;
        for( k = 0; k < cn; k++ )
            tab[i*cn + k] = j + k;
    }
    
    for( i = 0; i < right; i++ )
    {
        j = borderInterpolate(srcroi.width + i, srcroi.width, borderType)*cn;
        for( k = 0; k < cn; k++ )
            tab[(i+left)*cn + k] = j + k;
    }

    srcroi.width *= cn;
    dstroi.width *= cn;
    left *= cn;
    right *= cn;
    
    uchar* dstInner = dst + dststep*top + left*elemSize;

    for( i = 0; i < srcroi.height; i++, dstInner += dststep, src += srcstep )
    {
        if( dstInner != src )
            memcpy(dstInner, src, srcroi.width*elemSize);
        
        if( intMode )
        {
            const int* isrc = (int*)src;
            int* idstInner = (int*)dstInner;
            for( j = 0; j < left; j++ )
                idstInner[j - left] = isrc[tab[j]];
            for( j = 0; j < right; j++ )
                idstInner[j + srcroi.width] = isrc[tab[j + left]];
        }
        else
        {
            for( j = 0; j < left; j++ )
                dstInner[j - left] = src[tab[j]];
            for( j = 0; j < right; j++ )
                dstInner[j + srcroi.width] = src[tab[j + left]];
        }
    }
    
    dstroi.width *= elemSize;
    dst += dststep*top;
    
    for( i = 0; i < top; i++ )
    {
        j = borderInterpolate(i - top, srcroi.height, borderType);
        memcpy(dst + (i - top)*dststep, dst + j*dststep, dstroi.width);
    }
    
    for( i = 0; i < bottom; i++ )
    {
        j = borderInterpolate(i + srcroi.height, srcroi.height, borderType);
        memcpy(dst + (i + srcroi.height)*dststep, dst + j*dststep, dstroi.width);
    }
}


static void copyMakeConstBorder_8u( const uchar* src, size_t srcstep, Size srcroi,
                                    uchar* dst, size_t dststep, Size dstroi,
                                    int top, int left, int cn, const uchar* value )
{
    int i, j;
    AutoBuffer<uchar> _constBuf(dstroi.width*cn);
    uchar* constBuf = _constBuf;
    int right = dstroi.width - srcroi.width - left;
    int bottom = dstroi.height - srcroi.height - top;
    
    for( i = 0; i < dstroi.width; i++ )
    {
        for( j = 0; j < cn; j++ )
            constBuf[i*cn + j] = value[j];
    }
    
    srcroi.width *= cn;
    dstroi.width *= cn;
    left *= cn;
    right *= cn;
    
    uchar* dstInner = dst + dststep*top + left;
    
    for( i = 0; i < srcroi.height; i++, dstInner += dststep, src += srcstep )
    {
        if( dstInner != src )
            memcpy( dstInner, src, srcroi.width );
        memcpy( dstInner - left, constBuf, left );
        memcpy( dstInner + srcroi.width, constBuf, right );
    }
    
    dst += dststep*top;
    
    for( i = 0; i < top; i++ )
        memcpy(dst + (i - top)*dststep, constBuf, dstroi.width);
    
    for( i = 0; i < bottom; i++ )
        memcpy(dst + (i + srcroi.height)*dststep, constBuf, dstroi.width);
}

    
void copyMakeBorder( const Mat& src, Mat& dst, int top, int bottom,
                    int left, int right, int borderType, const Scalar& value )
{
    CV_Assert( top >= 0 && bottom >= 0 && left >= 0 && right >= 0 );
    
    dst.create( src.rows + top + bottom, src.cols + left + right, src.type() );
    if( borderType != BORDER_CONSTANT )
        copyMakeBorder_8u( src.data, src.step, src.size(),
                           dst.data, dst.step, dst.size(),
                           top, left, (int)src.elemSize(), borderType );
    else
    {
        double buf[4];
        scalarToRawData(value, buf, src.type());
        copyMakeConstBorder_8u( src.data, src.step, src.size(),
                                dst.data, dst.step, dst.size(),
                                top, left, (int)src.elemSize(), (uchar*)buf );
    }
}
    
}


CV_IMPL void
cvCopyMakeBorder( const CvArr* srcarr, CvArr* dstarr, CvPoint offset,
                  int borderType, CvScalar value )
{
    cv::Mat src = cv::cvarrToMat(srcarr), dst = cv::cvarrToMat(dstarr);
    int left = offset.x, right = dst.cols - src.cols - left;
    int top = offset.y, bottom = dst.rows - src.rows - top;
    
    CV_Assert( dst.type() == src.type() );
    cv::copyMakeBorder( src, dst, top, bottom, left, right, borderType, value );
}

/* End of file. */