Re: [Qemu-devel] [RFC] qemu VGA endian swap low level drawing changes

[Paolo Bonzini]

Il 19/06/2014 14:33, Gerd Hoffmann ha scritto:
> I'm thinking about splitting the conversion (for truecolor modes, still
> need to think about how to do paletted modes best) into two steps:
> First byteswap to bring the data into a format pixman can handle, then
> feed into pixman for further conversion.  Which probably comes with a
> performance penalty (but maybe not due to pixman performing better than
> our self-made conversion code).  It will only hit the more unusual guest
> framebuffer formats which I can't feed into pixman directly.  Acceptable
> or not?

It's probably not going to have a performance penalty if you vectorize 
the word-swap.  (Which can be done later).

Paolo