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Re: [ft-devel] how to compute maxp.maxStackElements?


From: Werner LEMBERG
Subject: Re: [ft-devel] how to compute maxp.maxStackElements?
Date: Sat, 08 Oct 2016 18:28:03 +0200 (CEST)

> I noticed however that the value as computed by VTT seems to be
> always a bit greater than the one I get from the code above, usually
> around 80-90 bytes greater (it varies from font to font).  I don't
> know why that is the case, and I wonder if someone else in this list
> could shed some light on this?

The stack size might depend on the used PPEM value if there is
conditional code – do you run the loop for all PPEM values from, say,
6ppem to 72ppem?  Similarly, it might depend on the used rasterizer
mode (ClearType, B/W rendering, etc.) and a lot of other things, so I
can imagine that VTT adds some bytes just to be on the safe side.


    Werner

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