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* Copyright 2015-2021 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 performing a filtering an image using a general integer rectangular kernel
// implemented with Intel(R) Integrated Primitives (Intel(R) IPP) functions:
//     ippiImageJaehne_32f_C1R
//     ippiFilterGaussianInit
//     ippiFilterGaussianBorder_32f_C1R


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

#define WIDTH  128  /* image width */
#define HEIGHT  64  /* image height */

/* 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;
    Ipp32f* pSrc = NULL, *pDst = NULL;     /* Pointers to source/destination images */
    int srcStep = 0, dstStep = 0;          /* Steps, in bytes, through the source/destination images */
    IppiSize roiSize = { WIDTH, HEIGHT };  /* Size of source/destination ROI in pixels */
    Ipp32u kernelSize = 3;
    Ipp32f sigma = 0.35f;
    Ipp8u *pBuffer = NULL;                 /* Pointer to the work buffer */
    IppFilterGaussianSpec* pSpec = NULL;   /* context structure */
    int iTmpBufSize = 0, iSpecSize = 0;    /* Common work buffer size */
    IppiBorderType borderType = ippBorderRepl;
    Ipp8u borderValue = 0;
    int numChannels = 1;

    pSrc = ippiMalloc_32f_C1(roiSize.width, roiSize.height, &srcStep);
    pDst = ippiMalloc_32f_C1(roiSize.width, roiSize.height, &dstStep);

    check_sts( status = ippiImageJaehne_32f_C1R(pSrc, srcStep, roiSize) ) /* fill source image */

    check_sts( status = ippiFilterGaussianGetBufferSize(roiSize, kernelSize, ipp32f,
        numChannels, &iSpecSize, &iTmpBufSize) )

    pSpec = (IppFilterGaussianSpec *)ippsMalloc_8u(iSpecSize);
    pBuffer = ippsMalloc_8u(iTmpBufSize);

    check_sts( status = ippiFilterGaussianInit(roiSize, kernelSize, sigma,
        borderType, ipp32f, numChannels, pSpec, pBuffer) )

    check_sts( status = ippiFilterGaussianBorder_32f_C1R(pSrc, srcStep, pDst, dstStep,
        roiSize, borderValue, pSpec, pBuffer) )

EXIT_MAIN
    ippsFree(pBuffer);
    ippsFree(pSpec);
    ippiFree(pSrc);
    ippiFree(pDst);
    printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status));
    return (int)status;
}