Hello Lukáš,
I don't understand layers and overlays. This is what I could learn
about \tightlayer from the source; I hope that reviving your question
will help somebody else actually answer it.
\tightlayer is defined in pack-lyr.mkiv.
\unexpanded\def\tightlayer[#1]%
{\hbox
{\def\currentlayer{#1}% todo: left/right
\setbox\nextbox\emptybox % hoogte/breedte are
\wd\nextbox/\ht\nextbox
\hsize\layerparameter\c!width % \overlaywidth = \hsize
\vsize\layerparameter\c!height % \overlaywheight = \vsize
\composedlayer{#1}}}
The last command flushes the layer we are about to place:
\composedlayer{x} is syntactic sugar for \flushlayer[x]. (Braces vs.
brackets.)
So it seems that what \tightlayer does is create a layer object
exactly as large as its contents? What this is good for, and how it
relates to overlays, I do not know.
Good luck!
--Sietse
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