Re: Persistent CVT writes from glyf program.

[Werner LEMBERG]

Hello Ben,


> While investigating some odd behavior, I discovered that in FreeType
> if a TrueType glyf contains instructions which read/modify/write a
> CVT entry and the glyph is loaded more than once the modified values
> persist across calls. The persistence is in the (TT_SizeRec_)
> size.cvt since TT_Load_Context sets exec.cvt to size.cvt.  [...]

This is definitely a bug, thanks for noticing it!

> I'm not sure if this is supposed to work this way.  I don't think it
> should, but this doesn't seem to be addressed by any existing
> specification or documentation.

As so many things in the bytecode specification.  It's always annoying
to have an implementation first from which the documentation is
derived...

Do you have time to provide a patch?


    Werner