Re: Alternative pixel-based regtest checker

[Phil Holmes]

----- Original Message ----- 
From: "Phil Holmes" <address@hidden>
To: "Devel" <address@hidden>
Sent: Friday, March 01, 2013 7:15 PM
Subject: Alternative pixel-based regtest checker


> 4 files attached.  To try this out: create a new directory and place
> NoTagline.ly in it.  Create a subdirectory called input and put some 
> regtest
> files in there.  Run MakeOldPix.sh.  Make a change to lilypond.  Run
> MakeNewPix.sh.  Run ComparePix.sh.  Om my tests there were some false
> alarms, but it seems a fairly simple way to make an alternative regtest
> checker.
>
> There's lots of improvements that could be made: parallelism, using
> something other than diff, but it basically works.
>
> Thoughts?
>
> --
> Phil Holmes


Thanks to Felix (and some modification of his suggestion) I now have version 
0.b of my pixel-regtest checker.  And it works.  Instructions are as above.

I now convert the grayscale PNGs to black and white, which makes them less 
susceptible to false alarms.  On my build machine, the entire create old; 
make; create new; check takes about 4 minutes, of which 1 minute is the 
make.  If this were to be part of the code base, I'd suggest skipping the 
"copy the regtests" step and use the in-place ones; have a more sensible set 
of directory names for the old and new images; but apart from that I think 
it's ready to go.  Would people be comfortable with this as a set of 3 shell 
scripts, or should it be integrated into make in some way?

--
Phil Holmes

ComparePix.sh
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MakeOldPix.sh
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MakeNewPix.sh
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