[NTG-context] faulty to unicode mapping of chars encoded with surrogate pairs?

Hans Hagen j.hagen at xs4all.nl
Wed Aug 8 14:15:41 CEST 2018


On 8/8/2018 12:13 PM, Ulrike Fischer wrote:
> when I compile the following with context
> 
> \pdfvariable compresslevel=0
> \starttext
> $f$
> \stoptext
> 
> I get in the pdf
> 
> 1 beginbfchar
> <0515> <D875DC53>
> endbfchar
> 
> D875DC53 is according to
> http://www.russellcottrell.com/greek/utilities/surrogatepaircalculator.htm
> the codepoint 2D453 and this is not a valid unicode point. As a
> result copy& paste doesn't work correctly.
> 
> A similar example with xelatex writes  D835DC53 (remark the 3
> instead of the 7) instead in the pdf which gives the correct code
> point 1D453 and copies fine.
> 
> lualatex gives the faulty value too.
line 228 in font-map should be:

         k = k - 0x10000

(not v = ...)

Hans

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