I'm pretty much a cocoon newbie, but here's what I know:
In your sitemap you can use the resource-exists action to
take different routes through the pipeline depending on the
existence of a file. E.g.:
<map:match pattern="picture-*.png">
<map:act type="resource-exists">
<map:parameter name="url" value="picture-{1}.png" />
<!-- If it exists, read it. -->
<map:read type="resource"
src="picture-{../1}.png" mime-type="image/png" />
</map:act>
<!-- Otherwise, generate the png from svg: -->
<!-- This part I don't know how to do. :-) Anyone? -->
<!-- Especially the part about saving the result to a file. -->
</map:match>
> because serializing svg to png is very slow, is it possible to do
> somehow next:
>
> -> if picture-{id} exists -> map:read src="picture-{id}"
> -> if not -> generate png file from svg and then save it to filesystem
> and then show it.
>
> It would make things much faster.
>
> - Joose
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