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[fltk.coredev] Vote: make --enable-pango option use cairo-PostScript to output PostScript

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Vote: make --enable-pango option use cairo-PostScript to output PostScript Manolo Oct 27, 2020  
 
I propose to fix a limitation of our PostScript support where only latin
characters can be output in vectorial form to PostScript. Non-latin scripts
are output in bitmap form.
That is relevant for the X11 platform where FLTK printing uses PostScript.
[That is not important under Windows and macOS because printing
fully supports all of unicode in vectorial form there.]

The solution I propose is to use cairo's PostScript surface, and to activate that
by  "configure --enable-pango" or CMake's OPTION_USE_PANGO.

I attach, as an example, the PostScript output for test/editor and misc/lorem_ipsum.txt
containing all sorts of scripts.

It's all at
    https://github.com/ManoloFLTK/fltk.git
in branch pango-ps

Please, vote about my proposal to commit that to FLTK 1.4.
Thanks.

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