ippiMalloc problem

trlinux — Mon, 13 Dec 2010 09:11:12 GMT

Hi there, i'm trouble with ippiMalloc_32f_C1 i'm allocating memory like that ;

int r_step;

Ipp32f *imgResult = ippiMalloc_32f_C1(621, 471, &r_step);

//rstep is2496

and then i'm setting all values to 100 with ippiSet;

IppiSize ttsize = {621,471};

ippiSet_32f_C1R(100,imgResult,r_step,ttsize);

and then trying to reach some memory location like that;

float trouble= *(imgResult+(620+r_step*470)); //last pixel on the image ... if r_step is bigger than 118 going to exception ..

is there any problem with my way to reach memory location ?

I tested something with 4x4 array and working well with step is equal to 32 ;

int an;

IppiSize tsize = {4,4};

Ipp8u * test = ippiMalloc_8u_C1(tsize.width,tsize.height,&an); //an equal to 32

ippiSet_8u_C1R(0,test,an,tsize);

unsigned char fine = *(test+(3+an*3)); // last value on the array is equal to 0 working fine ...

ippiMalloc problem

Albert_Stepanov — Mon, 13 Dec 2010 11:26:43 GMT

Hi,
the ippiMalloc* functions return parameter 'step' in bytes. So right code to reach the last pixel is:
float trouble= *(imgResult+(620+r_step/sizeof(float)*470));
// not forget to free memory

ippiFree(imgResult);

Regards,
Albert

ippiMalloc problem

trlinux — Mon, 13 Dec 2010 12:38:37 GMT

Thanks Albert ...

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