topic Question about ippiCopyManaged_8u_C1R function in Intel® Integrated Performance Primitives

Question about ippiCopyManaged_8u_C1R function

wesky1984 — Wed, 30 May 2012 02:35:35 GMT

I am trying to copy my own 2D matrix data to ipp8u by usingippiCopyManaged_8u_C1R.

But it couldn't copy correctly:

Only the first row of matrix can be copiedproperly. The others are wrong.

The following is my code:

a[size.width*1] is not equal to ipp_template[step*1], which means copying is wrong.

Any wrong in my code?

[cpp]#include #include #include #include #include "ipp.h" //use ipp 7.0 library int main (void){ IppiSize size; size.width = 512; //if it's less than 256, the copying is ok size.height = 10; __declspec(align(32)) unsigned char* a = (unsigned char*)malloc(size.width*size.height); //2d Matrix data for(int i = 0; i < size.width*size.height; i++) { a = i %255; } int step; Ipp8u *ipp_template = ippiMalloc_8u_C1( size.width, size.height, &step); IppStatus err = ippiCopyManaged_8u_C1R((Ipp8u*)a, (Ipp8u)size.width, ipp_template, step, size, IPP_TEMPORAL_COPY); bool bEqual = (a[size.width*1] == ipp_template[step*1]); //No equal, why? return 0; } [/cpp]

Question about ippiCopyManaged_8u_C1R function

Ying_H_Intel — Wed, 30 May 2012 06:20:24 GMT

Hi wesky1984,

The problem is in (Ipp8u)size.width
IppStatuserr=ippiCopyManaged_8u_C1R((Ipp8u*)a,(Ipp8u)size.width

asthe function definition: IppStatus ippiCopyManaged_8u_C1R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst, int dstStep, IppiSize roiSize, int flags);

The srsStepBytes is type int .It is the distance in bytes of imagerow.To use (Ipp 8u)will crop the real value of size.width. please delete it. you will get expected result.

Best Regards,
Ying

Question about ippiCopyManaged_8u_C1R function

wesky1984 — Wed, 30 May 2012 09:11:08 GMT

I didn't notice the type before.

Thank you very much!