Re: Why the gd based terminal does support character entity reference ?

[sfeam <sf...@us...>]

On Tuesday, 22 March 2016 10:36:44 AM Tatsuro MATSUOKA wrote:
> Hello
> 
> I made a feature request:
> 
> Supports character entity reference
> 
> https://sourceforge.net/p/gnuplot/feature-requests/440/
> 
> As I wrote there, on the gd based terminals, one can use 
> 
> for example following code to write a Greek symbol "theta".
> 
> set term png
> set output 'test.png'
> plot sin(x) title '{/:Italic \θ}'
> set output
> 
> Why this feature only supports on the gd based terminals?
> 
> Does anyone know reasons?

libgd includes a table of character entity names that maps them to
the ISO-10646 code point for that character:

https://github.com/libgd/libgd/blob/master/src/entities.h

The text-handling routine in libgd uses this table to replace
for example "\&theta" with ISO-10646 codepoint 952.

	Ethan