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

[Dirk Pranke]

I like the idea. I'm not sure I agree w/ Adam that I'd roll the code
into DRT, insofar as I don't know how big it is and I would definitely
want the code shared across all of the DRT implementations. I'd
probably also do a pass over all of the existing PNGs at some point
rather than wait for them to be updated as necessary.

-- Dirk

On Tue, Jan 24, 2012 at 10:43 PM, Mike Lawther <mikelawther at chromium.org> wrote:
> 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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