Cygwin fails to utilize Unicode replacement character

[Corinna Vinschen]

On Sep  5 17:58, Corinna Vinschen wrote:
> On Sep  5 15:18, Marco Atzeri wrote:
> > Am 05.09.2018 um 13:58 schrieb Steven Penny:
> > > On Wed, 5 Sep 2018 09:55:28, Corinna Vinschen wrote:
> > 
> > > Using this file:
> > > 
> > >     $ cat glyph.c
> > >     #include <stdio.h>
> > >     #include <windows.h>
> > >     int main()
> > >     {
> > >       CONSOLE_FONT_INFOEX ta;
> > >       ta.cbSize = sizeof ta;
> > >       GetCurrentConsoleFontEx(GetStdHandle(STD_OUTPUT_HANDLE), 0, &ta);
> > >       HDC wh = GetDC(0);
> > >       SelectObject(wh,
> > >         CreateFontW(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ta.FaceName));
> > >       WCHAR xr[4] = {0xFFFD, 0x2592, 0x25A1, 0x01C4};
> > >       WORD zu[4];
> > >       GetGlyphIndicesW(wh, xr, 4, zu, 1);
> > >       printf("%ls:\n", ta.FaceName);
> > >       for (int q = 0; q < 4; q++) {
> > >         printf("  U+%04X: %s\n",
> > >         xr[q], zu[q] == 0xffff ? "failure" : "success");
> > >       }
> > >     }
> > > 
> > > I get this result:
> > > 
> > >     DejaVu Sans Mono:
> > >       U+FFFD: success
> > >       U+2592: success
> > >       U+25A1: success
> > >       U+01C4: failure
> > > 
> > 
> > Strange on W10 CMD I obtain
> > 
> > DejaVu Sans Mono  U+FFFD: failure
>                  ^^^
> You see this?  There's something really fishy here.  I see a similar
> effect which somehow depends on arbitrary changes to the source file:
> 
> - Sometimes I get "DejaVu Sans Mono" in FaceName and all works well.
> - Sometimes I get "DejaVu Sans Mono\1" or "DejaVu Sans Mono\6" and
>   the subsequent GetGlyphIndicesW returns failures for many or all
>   characters.
>   
> I'm trying to find what's affecting this for hours, but I don't get any
> conclusive results :(

OTOH, in my testing this only occurs for DejaVu Sans Mono.  I installed
Liberation Mono and Noto Mono as well and the above problem never occurs
with them.  Weird.  I'm about to let this slip as a font bug.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat
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