[MPlayer-dev-eng] [PATCH] -fPIC support for libswscale

[Jason Tackaberry]

On Mon, 2006-08-14 at 11:16 -0400, Jason Tackaberry wrote:
> Compiled and tested with gcc 2.95.3 (x86), gcc 3.2.3 (x86), gcc 3.4.2
> (x86_64), and gcc 4.0.2 (x86).  In each case, libswscale was compiled
> with -fPIC and -fno-PIC.  Build successful in all 8 cases.
> 
> Test involved playing:
> 
>    mplayer testfile.avi -vf scale=320:200 -sws 9 -vo png -frames 20
> 
> In all 8 cases, the resulting md5sum of the 20 png files was identical.
> (I also repeated with -sws 2, md5sums also identical.)

I forgot to mention, from my original email, I also tested the following
code paths (each separately with MMX, MMX2, 3DNOW, and C):

        Scaling and/or colorspace conversion (non-special converters):
              * YV12->BGR32 BICUBIC downscale
              * YV12->BGR24 BICUBIC downscale
              * RGB24->YUY2 BILINEAR upscale
              * BGR24->YUY2 BILINEAR upscale
              * BGR24->YUY2 FAST BILINEAR upscale
              * BGR32->RGB32 FAST BILINEAR downscale
              * Y8->Y8 BICUBLIN downscale
              * YV12->YV12 BUCUBIC downscale
              * YV12->YV12 BUCUBIC upscale
        
        Algorithms:
              * all algorithms, YV12->YV12 downscale and upscale
        
        Special converters;
              * YV12->YUY2
              * YV12->BGR24
              * BGR24->BGR32
              * BGR24->YV12
        
These particular tests I only ran on gcc 4.0.2 (-fPIC and -fno-PIC) but
combined with the other tests I ran with the other compilers, I think
there's a strong assurance that this patch doesn't break anything.

Cheers,
Jason.