topic Problem with ippiMalloc_16u_C1() in Intel® Integrated Performance Primitives

Problem with ippiMalloc_16u_C1()

marco_o — Wed, 17 Feb 2010 11:54:42 GMT

Hi all, I've a problem with ippiMalloc_16u_C1. When I try to allocate memory for an image (16bit depth, 1 channel PNG format) it return a stride = width * 16 / 8 + 10 and not = width *16/8 Why??

Problem with ippiMalloc_16u_C1()

matthieu_darbois — Wed, 17 Feb 2010 13:00:44 GMT

Hi,

ippiMalloc_* allocate a block of memory with each line aligned on a 32 bytes boundary.

So I guess that width*16/8 + 10 is a multiple of 32 in your case. That is width = 11 + x * 32 if I'm not mistaken.

Regards

Matthieu

Problem with ippiMalloc_16u_C1()

renegr — Wed, 17 Feb 2010 13:52:51 GMT

ippiMalloc not only aligns the x but also the y axis. If this is a problem for you, of course you can use ippsMalloc or _aligned_malloc from CRT. Then your stride is width*16/8 and you can use this stride also as a parameter to some ippi* functions. Many ippi* functions like color conversion, add, subtract ... will work without 32byte aligned lines.

Problem with ippiMalloc_16u_C1()

macaire — Wed, 17 Feb 2010 14:11:32 GMT

Quoting marco.o

Hi all, I've a problem with ippiMalloc_16u_C1. When I try to allocate memory for an image (16bit depth, 1 channel PNG format) it return a stride = width * 16 / 8 + 10 and not = width *16/8 Why??

HI, Marco.o

Did find a solution, Ithink you must try and go on the advice renegr's given you. With this way, you'll be ok.Sure.

Feel free and try to submit again if no solution.

Nice to have you as new member