[FFmpeg-devel] [PATCH] swscale alpha channel support

[Michael Niedermayer]

On Mon, Feb 23, 2009 at 06:39:38PM +0200, Kostya wrote:
> On Mon, Feb 23, 2009 at 04:22:23PM +0100, Michael Niedermayer wrote:
> > On Mon, Feb 23, 2009 at 04:16:44PM +0100, C?dric Schieli wrote:
> [...]
> > > Index: ffmpeg/libswscale/yuv2rgb2.c
> > > ===================================================================
> > > --- ffmpeg.orig/libswscale/yuv2rgb2.c	2009-02-23 15:14:39.409161445 +0100
> > > +++ ffmpeg/libswscale/yuv2rgb2.c	2009-02-23 15:17:36.861446441 +0100
> > > @@ -83,11 +83,11 @@
> > >      g = (void *)(c->table_gU[U] + c->table_gV[V]);  \
> > >      b = (void *)c->table_bU[U];
> > >  
> > > -#define PUTRGB(dst,src,i,o)          \
> > > -    Y = src[2*i+o];                  \
> > > -    dst[2*i  ] = r[Y] + g[Y] + b[Y]; \
> > > -    Y = src[2*i+1-o];                \
> > > -    dst[2*i+1] = r[Y] + g[Y] + b[Y];
> > > +#define PUTRGB(dst,src,i,o,a)              \
> > > +    Y = src[2*i+o];                        \
> > > +    dst[2*i  ] = r[Y] + g[Y] + b[Y] + (a); \
> > > +    Y = src[2*i+1-o];                      \
> > > +    dst[2*i+1] = r[Y] + g[Y] + b[Y] + (a);
> > >  
> > >  #define PUTRGB24(dst,src,i)                                  \
> > >      Y = src[2*i];                                            \
> > 
> > alpha can be merged in the table i think which avoids that 1 add per pixel
> 
> I don't think so - it's independent channel that is copied between different
> formats (YUV, RGB, whatever).

its set to 255 in that patch IIRC

[...]

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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

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