[MPlayer-dev-eng] Optimized SwScale code

[Felix Buenemann]

Hi,

great work Michael.

Here are my conclusions so far:
playing 480x480 svcd zooming to 640x480, cliplength ~60sec, system is PIII 
850, 100MHz FSB, 256MB, SavageMX 8MB, XFree 4.1.0, Kernel 2.4.10-ac9: 

ASM:  83sec
MMX:  48sec
MMX2: 40sec

(the mmx2 version is fast enough to play without -framedrop)

Upscaling:
to 640x480: works fine with ASM, MMX
            colored ghost picture with MMX2
to 768x576: works fine with ASM, MMX
            colored ghost picture with MMX2

it seems the ghost picture is cause by the red color plane being shifted 
8pixels to the right.

Dowscaling:
to 384x288: horizontal interlaced like effect with ASM, MMX
            horizontal and vertical interlaced like effect with MMX2
to 352x264: horizontal interlaced like effect with ASM, MMX
            horizontal and vertical interlaced like effect with MMX2
to 320x240: image looks dark and red with ASM, MMX, MMX2

The red picture only happens if height is exactly original height divided by 
two.

-- 
Best Regards,
	Atmos
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