Hi Niels,
thank you very much for your good views, i have changed the memory
allocation as you have mentioned but now i couldnt see the image, or is
there any other way to allocate surface area in my physical memory using
malloc and accelarate that memory for better performance, without using
DSCAPS_SYSTEMONLY??just let me know yur view???
thanks
Anil
On Thu, Oct 23, 2008 at 5:21 PM, Niels Roest <[EMAIL PROTECTED]> wrote:
> Hi Anil,
> if you have a preallocated surface, in general you do not provide a
> physical address, just a virtual address.
> This means that the video hardware cannot use it, and an extra Blit is
> required to a hardware-usable portion of memory. Also, I noticed that you
> didn't take the pitch into account in your calloc() and you might have
> alignment problems if fbAddr returns an odd adress, say. I'd advise to use
> another pool to allocate in.. try to not specify a system capability (no
> DSDESC_CAPS, or dsc.caps = 0).
>
> Anil Kumar wrote:
>
>> Hi all,
>> Until now everything was going fine, while doing some research on DFB,
>> but currently i encounter a strange situation in memory allocation for
>> framebuffers. because currently i have allocated videomemory for creating a
>> surface options but at onestage the memory is full and i get crashed, so i
>> need to split the memory allocation to share with my system like using
>> malloc becoz my hardware has enough memory but video memory is limited. but
>> the strange is that the image when it tries to blit to the surface it takes
>> more time to blit and also the image is not that clear too. but while using
>> videoonly option my image is fine. So is there anyother option to allocate
>> memory to create a surface, i even tried preallocation as follows
>> void* fbAddr =(void *) calloc(width * height, sizeof(int));
>> dsc.flags = DSDESC_CAPS|DSDESC_PREALLOCATED|DSDESC_WIDTH |
>> DSDESC_HEIGHT | DSDESC_PIXELFORMAT;
>> dsc.caps = DSCAPS_SystemOnly;
>> dsc.preallocated[0].data=fbAddr;
>> dsc.preallocated[0].pitch = primary.pitch;
>> dsc.preallocated[1].data = NULL;
>> dsc.preallocated[1].pitch = 0;
>> dsc.width = width;
>> dsc.height = height;
>> dsc.pixelformat = DSPF_ARGB;
>> error = dfb->CreateSurface(dfb, &dsc, &surface);
>> but still it takes more time to blit/draw to the surface. So please can
>> anyone help me out to solve this issue, Thanking you for your sharing your
>> precious time in reading this.
>>
>> cheers
>> Kumar
>> ------------------------------------------------------------------------
>>
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>>
>>
>
>
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>
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> | http://www.directfb.org/ |
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