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

[Jason Tackaberry]

The attached patch allows libswscale to be compiled with -fPIC.  In most
cases I was able to use another register in lieu of ebx.  (Note that
this patch also includes the patch in my previous email.)

I have tested the following (each separately with MMX, MMX2, and 3DNOW):

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

Last year I did some work porting SwScaler to xine, which I've picked up
again.  Making libswscale build with -fPIC is necessary for us, so I
hope this patch has a chance of being merged.

My asm-fu is weak, so hopefully somebody clueful can review this patch.

Thanks,
Jason.
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