Hi,
In swscale.c, there are some lines that adjust {lum,chr}XInc depending
on MMX or MMX2 being used for fast bilinear. They were added (still
with the old name of s_xinc) in this commit:
http://git.ffmpeg.org/?p=libswscale;a=commitdiff;h=87d2542e33c80731dab64339aebcaebbaa25911e
Where do the magical "20" values come from?
>From what I understood and from some tests I've done, this creates
some rather ugly last lines at the far right of the image. The output
also differs for C, mmx, and mmx2, and it's not under BITEXACT.
To remove this adjustment and have the same output for all
configurations, wouldn't it only be necessary to:
- adjust mmx and mmx2 filters to only work up to the last input pixels
it can before reading past the end.
- run the C code on the last pixels if necessary.
This should also remove some +1s being allocated because of the MMX
filter, and the limit that the MMX2 filter can only work with srcW&31.
Ramiro Polla
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