Cygwin fails to utilize Unicode replacement character
Thomas Wolff
towo@towo.net
Mon Sep 3 16:34:00 GMT 2018
Am 03.09.2018 um 16:59 schrieb Corinna Vinschen:
> On Sep 3 14:46, Corinna Vinschen wrote:
>> On Sep 2 05:51, Steven Penny wrote:
>>> On Sun, 2 Sep 2018 10:07:10, Thomas Wolff wrote:
>>>> Actually, the width problem I suggested in my other response (and even
>>>> referring to the wrong character) does not apply as mintty enforces
>>>> proper width in that case.
>>>> Also, even with fonts that do not provide the glyph, you will usually
>>>> still see it by the Windows font fallback mechanism.
>>>> Shall I make it configurable?
>>> your call - here are the possible resolutions - in order of my preference:
>>>
>>> 1. Change the default to U+FFFD with no option
>>> 2. Change the default to U+FFFD with option to change
>>> 3. Leave default as is with option to change
>> Ideally we could check if the current font supports a visual
>> representation of 0xfffd and if not, fall back to 0x2592.
>>
>> Not sure how feasible that is, but it doesn't seem to be overly
>> complicated. I'm just looking into a solution for the Cygwin
>> console.
> Only, I can't get this working. In theory the GDI function
> GetGlyphIndicesW is supposed to allow checking if a certain character
> exists. But I'm getting a weird result. This code:
>
> static const wchar_t replacement_char[2] =
> {
> 0xfffd, /* REPLACEMENT CHARACTER */
> 0x2592 /* MEDIUM SHADE */
> };
> HWND cwnd = GetConsoleWindow ();
> HDC cdc = GetDC (cwnd);
> int rp_idx = 0;
> WORD gi = 0;
> DWORD ret = GetGlyphIndicesW (cdc, replacement_char, 1, &gi,
> GGI_MARK_NONEXISTING_GLYPHS);
> if (ret != GDI_ERROR && gi == 0xffff)
> rp_idx = 1;
>
> always sets rp_idx to 1 when called from inside the Cygwin DLL,
> independently of the actual console font. And, here's the really weird
> thing, it always sets rp_idx to 0 when called directly from an
> application, likewise independently of the actual console font.
>
> Does anybody have an idea what I'm doing wrong?
This works in mintty, just uploaded a patch. Maybe somehow the
GetConsole "dc" does not support this usage?
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