convolution types

I'm attempting to translate a matlab image convolution (conv2) to c++ using the ipp libs. My issue is that the only options provided by the ippiConv_ are 'valid' and 'full'. conv2 in matlab provides 'valid', 'full', and 'same' of which the code i'm trying to translate uses the 'same' option. I have the 'valid' option working, however the borders of the image don't match the output of matlab (obviously). Is there a way to match the 'same' functionality? Also, if i try to do a 'full' convolution using ippiConv, my returned buffer size is incorrect. If i try to hard code the size to something big, then run the convolution it crashes...not sure why. Can someone help?

Sample code below.

  Ipp8u* pBuffer        = nullptr;
  IppStatus status      = ippStsNoErr;
  IppEnum algType       = (IppEnum)(ippAlgAuto | ippiROIValid);
  int32_t buffSizeBytes = 0;

  status = ippiConvGetBufferSize(srcRoiSize, tplRoiSize, ipp32f, 1, algType, &buffSizeBytes);

  pBuffer = ippsMalloc_8u(buffSizeBytes);

  outImg.Clear();
  status = ippiConv_32f_C1R(
    srcImg[0],
    srcImg.Cols() * sizeof(float),
    srcRoiSize,
    tpl[0],
    tpl.Cols() * sizeof(float),
    tplRoiSize,
    outImg[0],
    outImg.Cols() * sizeof(float),
    algType,
    pBuffer);

  if (pBuffer != nullptr) ippsFree(pBuffer);