[directfb-dev] Re: patch stretchblitting YUV in software

[Claudio \"KLaN\" Ciccani]

Below there's a modified version of the YUY2 scaling function that blits 
32 bits at once.
I don't see differencies on my machine (Athlon-Xp 1,6 GHz), but ,if you 
think it's better,
I will commit this one (and use the same method for the UYVY function).

static void Bop_yuy2_Sto_Aop( GenefxState *gfxs )
{
    int    w      = gfxs->length >> 1;
    int    ysc    = 0;
    int    crsc   = 0;
    __u32 *D      = (__u32*) gfxs->Aop;
    __u32 *S      = (__u32*) gfxs->Bop;
    __u16 *S2     = (__u16*) gfxs->Bop;
    int    SperD  = gfxs->SperD;
    int    SperD2 = gfxs->SperD << 1;
    while (w--) {
     register __u32 Dpix;
#ifdef WORDS_BIGENDIAN
     Dpix  = S[crsc>>16] & 0x00ff00ff;              /* chroma samples */
     Dpix |= *((__u8*) &S2[ysc>>16]) << 16;         /* first y sample */
     Dpix |= *((__u8*) &S2[(ysc+SperD)>>16]);       /* second y sample */
#else
     Dpix  = S[crsc>>16] & 0xff00ff00;              /* chroma samples */
     Dpix |= *((__u8*) &S2[ysc>>16]);               /* first y sample */
     Dpix |= *((__u8*) &S2[(ysc+SperD)>>16]) << 16; /* second y sample */
#endif
     *D++ = Dpix;
     ysc  += SperD2;
     crsc += SperD;
    }
}

Regards,
Claudio