[webkit-dev] optimising png files in LayoutTests - an experiment

[Mike Lawther]

Hi guys,

Just thought I'd share the results of an experiment I did in optimising the
png files in LayoutTests.

I used a tool on Mac called ImageOptim (http://imageoptim.pornel.net/)
which tries a set of different png lossless optimising tools (like pngcrush
- I also downloaded and included PNGOUT). Note that this strips out some of
the stuff we need, like the hash, so if doing this for real we'd have to
watch out for that.

My results were:

Before:
$ ls -laR LayoutTests/ | grep png$ | awk '{total = total + $5}END{print
total}'
1220535840

Test:
$ find LayoutTests/ | grep png$ | xargs open -a ImageOptim.app

 After:
$ ls -laR LayoutTests/ | grep png$ | awk '{total = total + $5}END{print
total, 1220535840 - total}'
937198328 283337512

So this has saved ~280MB (~23% of the original size).

Based on this, it seems worthwhile to include a png optimiser somewhere in
the patch upload/submit toolchain, and also (separately) to optimise the
existing pngs.

Thoughts?

    mike
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