topic Re: iterating ippiMalloc in Intel® Integrated Performance Primitives

iterating ippiMalloc

adig — Thu, 06 Jan 2005 16:05:52 GMT

hi all

the ippimalloc is not exactly clear to me.

let us say for example i have an allocated memory block A.

how do i go to cell [5][6] ?

someone needs to calculate the correct location, is it me ?

if it is me - what is the StepBytes parameter , how do i use it ?

adi

Re: iterating ippiMalloc

seiji-torigoe — Thu, 06 Jan 2005 17:40:14 GMT

I calculate it myself.

#include "ipp.h"
int main(int argc, char* argv[])
{
Ipp16s * pImg; Ipp16s * pTmp;
int widthPixels, heightPixels, stepBytes;
int y, x; Ipp16s value;

widthPixels = 10; heightPixels = 10;
pImg = ippiMalloc_16s_C1(widthPixels, heightPixels, &stepBytes);

// set pixel
value = 1;
for ( y = 0; y < heightPixels; y++ )
{
pTmp = pImg + y * stepBytes / sizeof(Ipp16s);
for ( x = 0; x < widthPixels; x++ )
{
*pTmp = value; printf("%d, ", *pTmp); pTmp++; value++;
} printf(" ");
} printf(" ");

// get pixel
x = 5; y = 6;
pTmp = pImg + x + y * stepBytes / sizeof(Ipp16s);
printf("pixel[5][6] = %d ", *pTmp);

ippiFree(pImg);

return 0;
}

Message Edited by Seiji-Torigoe on 01-06-2005 01:44 AM

Re: iterating ippiMalloc

Vladimir_Dudnik — Fri, 07 Jan 2005 23:34:52 GMT

Hi,

first of all, please consult with IPPI User's Manual, Chapter 2 - Intel Integrated Performance Primitives Concepts, Article - Image Data Types and Ranges. We tried to answer the most of question which usually people have when they are looking on the libraries at the first time.

Regards,

Vladimir

Re: iterating ippiMalloc

borix — Fri, 07 Jan 2005 23:35:09 GMT

Adi, stepBytes moves you to the next row/line of the image. if you are in the beginning then to the beginning, if you are in the end then to the end. so, for the current position p you jump to the point below by (char*)p+stepBytes.

Re: iterating ippiMalloc

seiji-torigoe — Sat, 08 Jan 2005 08:47:31 GMT

It might be such a code.

pTmp = (Ipp16s *)(
(char *)pImg + x * sizeof(Ipp16s) + y * stepBytes
);
printf("pixel[5][6] = %d ", *pTmp);

Re: iterating ippiMalloc

mh_de_ruiter — Sat, 22 Jan 2005 05:14:37 GMT

does ippimalloc allocates basicly muuuuch more memory as 'normal' createcompatibelbitmap etc. ?

i mean.. is every color of each pixels stored like in ONE whole 32 bit block ?

when the normal bitmaps use 'only' 8 bits per color..

does ippimalloc uses (allocates) anyway 32 bits per color of each pixel ?