Cygwin fails to utilize Unicode replacement character

Wed Sep 5 20:15:00 GMT 2018

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 Mono1円" or "DejaVu Sans Mono6円" 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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