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X-HELO: | mout.kundenserver.de |
Subject: | Re: Cygwin fails to utilize Unicode replacement character |
To: | cygwin AT cygwin DOT com |
References: | <7942b18e-96bf-a824-4dac-82715d87af55 AT towo DOT net> <5b8bdcc4 DOT 1c69fb81 DOT 84d1a DOT e6b9 AT mx DOT google DOT com> <20180903124616 DOT GT6350 AT calimero DOT vinschen DOT de> <20180903145919 DOT GU6350 AT calimero DOT vinschen DOT de> |
From: | Thomas Wolff <towo AT towo DOT net> |
Message-ID: | <126ebbde-2432-f19b-6c5c-fe61f31e4647@towo.net> |
Date: | Mon, 3 Sep 2018 18:34:28 +0200 |
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In-Reply-To: | <20180903145919.GU6350@calimero.vinschen.de> |
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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? -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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