Re: [AD] SSE2 vs malloc()

[aj <aj@xxxxxxxxxx>]

Chris wrote:

> On Friday 14 October 2005 10:13 am, aj wrote:
>  
>
> > Robert Ohannessian wrote:
> >    
> >
> > > What do you do about odd-sized bitmaps?
> > >      
> > alignment has little to do with the bitmaps size.
> >    
>
> But if you have, say, a 299x645 memory bitmap, then the line[] pointers won't 
> be 16-byte aligned. You could get around this by making the bitmap pitch 
> ((w*bytes_per_pixel + 15) & ~15), but I'm sure some programs will break if 
> there's space between the end of line[x] and the beginning of line[x+1].
>  

As has been mentioned before, anyone that uses the ->dat[] to manipulate 
bits is  doing it wrong.
The docs say to use the line[]  not the dat[].  This has been the case 
for a while, anyone that has used the ->dat[] would probably require an 
older allegro anyway, due to the other changes that have occurred laterly.
Im still propossing this  _aligned_malloc() as a #define-able thing, 
that only gets set specifically by the user, default will use regular  
malloc()



> And also, you can't gaurantee the alignment of video bitmaps, can you?
>  

You would not be doing SSE2 instructions on video bitmaps, it makes no 
sense to do so.
Do video bitmaps use malloc() ?