[SDL] SDL_image and memory

matt mattmatteh at earthlink.net
Wed Sep 20 12:06:25 PDT 2006


please start a new thread for a new topic

benang at cs.its.ac.id wrote:
> Okay, now I get the big picture. Anyway, the bitmaps were overwhelming and
> made the application crash. So, I intend to do it in the SDL_image's way.
> One more question though, is there any library for playing avi or mpg
> files with SDL?
>
> Thanks alot.
>
>   
>> On Wednesday 20 September 2006 06:15, benang at cs.its.ac.id wrote:
>>     
>>> Thanks for the reply. Okay what if I change my question. If I load
>>> the resources into RWops pointers, and convert them to SDL_Surface
>>> only when needed, would the cost of conversion be more efficient
>>> than if the SDL_Surface were all (or partially) be read from the
>>> swap pagefile (obviously it will happen because the total of the
>>> bitmap files are 6-700 megs whereas my memory is only 512 megs)?
>>>       
>> As far as performance is concerned, that depends on the speed of the
>> disk the swap is on, in relation to the speed of the CPU. Also, if
>> your application already needs a lot of CPU time, adding
>> decompression overhead might be worse than streaming from disk, even
>> if the disk is relatively slow.
>>
>> There is another problem, however: Timing. Disk access is rather
>> "random" in nature; sometimes it's very quick (data already cached or
>> in the read-ahead buffers), and sometimes very slow (data needs to be
>> read from the physical disk before your application can continue). To
>> keep the disk access from making animation unsmooth, you'd need to do
>> the disk access in a background thread or similar.
>>
>>
>> //David Olofson - Programmer, Composer, Open Source Advocate
>>
>>     
>
>
>
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