Re: [ft-devel] Question about CFF arithmetic operator dup

[Graham Asher]

The net effect of consuming one element and adding two is to add one. 
The code looks correct to me.

Graham Asher


Ning Dong wrote:
> Hi,
>  
> I'm checking the cff_decoder_parse_charstrings function in cffgload.c 
> of FT239.
>  
> According to CFF technical note #5177, operator "dup" should 
> consume one element and put two elements to arguement stack:
> dup     any dup(12 27) any any
>  
> But in cff_decoder_parse_charstrings, the codes like this:
>         case cff_op_dup:
>           FT_TRACE4(( " dup\n" ));
>           args[1] = args[0];
>           args++;                //should be args+=2?
>           break;
> Only one element put to arguement stack.
>  
> Is this a bug?
> FT2310 is the same.
> 2009-10-09
> ------------------------------------------------------------------------
> Ning Dong
> ------------------------------------------------------------------------
>
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