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#include "precomp.hpp"

CV_IMPL void
cvDeInterlace( const CvArr* framearr, CvArr* fieldEven, CvArr* fieldOdd )
{
    CV_FUNCNAME("cvDeInterlace");

    __BEGIN__;

    CvMat frame_stub, *frame = (CvMat*)framearr;
    CvMat even_stub, *even = (CvMat*)fieldEven;
    CvMat odd_stub, *odd = (CvMat*)fieldOdd;
    CvSize size;
    int y;

    CV_CALL( frame = cvGetMat( frame, &frame_stub ));
    CV_CALL( even = cvGetMat( even, &even_stub ));
    CV_CALL( odd = cvGetMat( odd, &odd_stub ));

    if( !CV_ARE_TYPES_EQ( frame, even ) || !CV_ARE_TYPES_EQ( frame, odd ))
        CV_ERROR( CV_StsUnmatchedFormats, "All the input images must have the same type" );

    if( frame->cols != even->cols || frame->cols != odd->cols ||
        frame->rows != even->rows*2 || odd->rows != even->rows )
        CV_ERROR( CV_StsUnmatchedSizes, "Uncorrelated sizes of the input image and output fields" );

    size = cvGetMatSize( even );
    size.width *= CV_ELEM_SIZE( even->type );

    for( y = 0; y < size.height; y++ )
    {
        memcpy( even->data.ptr + even->step*y,
                frame->data.ptr + frame->step*y*2, size.width );
        memcpy( odd->data.ptr + even->step*y,
                frame->data.ptr + frame->step*(y*2+1), size.width );
    }

    __END__;
}

/* End of file. */
