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* Copyright 2015-2018 Intel Corporation.
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* provided to you (License).  Unless the License provides otherwise, you may not
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//    A simple example of computing Hu moment values for images.
// implemented with Intel(R) Integrated Primitives (Intel(R) IPP) functions:
//     ippiSet_8u_C1R
//     ippiMomentGetStateSize_64f
//     ippiMomentInit_64f
//     ippiMoments64f_8u_C1R
//     ippiGetHuMoments_64f

#include <stdio.h>
#include "ipp.h"

/* Next two defines are created to simplify code reading and understanding */
#define EXIT_MAIN exitLine:                                  /* Label for Exit */
#define check_sts(st) if((st) != ippStsNoErr) goto exitLine; /* Go to Exit if Intel(R) IPP function returned status different from ippStsNoErr */

/* Results of ippMalloc() are not validated because Intel(R) IPP functions perform bad arguments check and will return an appropriate status  */

int main(void)
{
    IppStatus status = ippStsNoErr;
    Ipp8u pSrc[64];                              /* Pointer to source image */
    IppiSize roiA={8,8}, roiH={8,1}, roiV={1,8}; /* Used image ROI sizes */
    int sizeState = 0;                           /* State size */
    IppiHuMoment_64f hmH = {0}, hmV= {0};        /* Horizontal and vertical moments */
    IppiMomentState_64f *pState = NULL;          /* Pointers to state structure */

    check_sts( status = ippiMomentGetStateSize_64f(ippAlgHintNone, &sizeState) )

    /* memory allocation */
    pState  = (IppiMomentState_64f*) ippMalloc( sizeState );

    check_sts( status = ippiMomentInit_64f(pState, ippAlgHintNone) )

    /* set horizontal edge */
    check_sts( status = ippiSet_8u_C1R( 0, pSrc, 8, roiA ) )
    check_sts( status = ippiSet_8u_C1R( 3, pSrc, 8, roiH ) )

    /* compute spatial moment values */
    check_sts( status = ippiMoments64f_8u_C1R( pSrc, 8, roiA, pState ) )

    /* compute seven Hu moment invariants */
    check_sts( status = ippiGetHuMoments_64f( pState, 0, hmH ) )

    /* set vertical edge */
    check_sts( status = ippiSet_8u_C1R( 0, pSrc, 8, roiA ) )
    check_sts( status = ippiSet_8u_C1R( 3, pSrc, 8, roiV ) )

    /* compute spatial moment values */
    check_sts( status = ippiMoments64f_8u_C1R( pSrc, 8, roiA, pState ) )

    /* compute seven Hu moment invariants */
    check_sts( status = ippiGetHuMoments_64f( pState, 0, hmV ) )

EXIT_MAIN
    ippFree( pState );
    printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status));
    return (int)status;
}