Bug 10693 - Underscores ("_") not displaying in Rxvt with Cygwin
Summary: Underscores ("_") not displaying in Rxvt with Cygwin
Status: REOPENED
Alias: None
Product: DejaVu
Classification: Unclassified
Component: Mono Sans (show other bugs)
Version: unspecified
Hardware: Other Cygwin
: medium normal
Assignee: Deja Vu bugs
QA Contact:
URL:
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Depends on:
Blocks:
 
Reported: 2007-04-20 13:02 UTC by Thorsten Kampe
Modified: 2015-04-20 21:01 UTC (History)
0 users

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Attachments
screenshot showing the problem (all ASCII characters) (7.28 KB, image/png)
2007-04-21 07:13 UTC, Thorsten Kampe
Details
q|_|p in size 17 (2.37 KB, image/png)
2007-04-21 07:27 UTC, Thorsten Kampe
Details
q|_|p in size 16 (correctly displayed) (2.25 KB, image/png)
2007-04-21 07:30 UTC, Thorsten Kampe
Details
q|_|p in size 18 (correctly displayed) (2.37 KB, image/png)
2007-04-21 07:31 UTC, Thorsten Kampe
Details

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Description Thorsten Kampe 2007-04-20 13:02:48 UTC
DejaVu Sans Mono-17 (last release)

Underscores don't display in the well-known rxvt terminal under Cygwin. Instead of the underscores a blank is displayed so "this_is_a_test" shows as "this is a test" (which is very annoying and irritating).

The same font (and size) displays fine in the standard Cygwin console and all other Win32 apps. With other fonts in rxvt the underscores show.

I'd be happy to do more troubleshooting and give a more detailed description as DejaVu is my favourite font for all apps under Windows and Linux
Comment 1 Denis Jacquerye 2007-04-20 13:40:03 UTC
Isn't this an rxvt+cygwin bug?
Comment 2 Denis Jacquerye 2007-04-20 13:46:21 UTC
Marking as not our bug.
Does the same thing happen with Bitstream Vera Mono?

Please report the bug to
http://sourceforge.net/projects/rxvt and/or
http://cygwin.com/problems.html
Comment 3 Thorsten Kampe 2007-04-21 05:53:19 UTC
I think, this /might/ be a Cygwin/rxvt bug. Unfortunately I can't convince rxvt under Linux to use DejaVu Fonts ("can't load DejaVu Sans Mono-17") - so I can't tell whether it's just a Cygwin/rxvt thingy).

Please mind you that just because the bug is only triggered under a specific Operating System/Terminal combination doesn't necessarily mean that the bug is on the OS/Terminal side.

Please explain why you think this is not a DejaVu bug.
Comment 4 Thorsten Kampe 2007-04-21 06:02:29 UTC
I did some further research:

1. Bitstream Vera Sans Mono shows the same behaviour.

2. The bug only shows with font size 17 (not with 10 - 16 or 18 or 19). Yes, I know this sounds ridiculous but that's the way it is.

I wouldn't have a problem reporting the bug to the Cygwin rxvt maintainer - but as rxvt is AFAIK not actively maintained and other fonts (Fixedsys) don't show the behaviour I think he will classify this as "NOTOURBUG", too...
Comment 5 Denis Jacquerye 2007-04-21 06:41:53 UTC
(In reply to comment #3)
> I think, this /might/ be a Cygwin/rxvt bug. Unfortunately I can't convince rxvt
> under Linux to use DejaVu Fonts ("can't load DejaVu Sans Mono-17") - so I can't
> tell whether it's just a Cygwin/rxvt thingy).

rxvt -fn "-dejavu-dejavu sans mono-medium-r-normal-*-17-120-100-100-m-*-*-*"

> Please explain why you think this is not a DejaVu bug.

I can't reproduce this.

Could you give a screenshot of a string with descenders like and underscore, like "j_g". I'd like to know if rxvt+cygwin displays the lowest line of pixels.
Comment 6 Thorsten Kampe 2007-04-21 06:59:49 UTC
(In reply to comment #5)
> (In reply to comment #3)
>> I think, this /might/ be a Cygwin/rxvt bug. Unfortunately I can't convince rxvt
>> under Linux to use DejaVu Fonts ("can't load DejaVu Sans Mono-17") - so I can't
> > tell whether it's just a Cygwin/rxvt thingy).
> 
> rxvt -fn "-dejavu-dejavu sans mono-medium-r-normal-*-17-120-100-100-m-*-*-*"

Same effect: rxvt: can't load font "-dejavu-dejavu sans mono-medium-r-normal-*-17-120-100-100-m-*-*-*"

Maybe rxvt is searching fonts somewhere else than - for instance - Konsole. (This is Gentoo Linux but I'm not expecting you to solve my rxvt-Linux-font problem)
 
> > Please explain why you think this is not a DejaVu bug.
> 
> I can't reproduce this.

Did you try this under Linux or under Cygwin/rxvt?
 
> Could you give a screenshot of a string with descenders like and underscore,
> like "j_g". I'd like to know if rxvt+cygwin displays the lowest line of pixels.

I don't fully understand your request. What does "string with descenders like" mean? You want just a string with j_g or something else?
Comment 7 Thorsten Kampe 2007-04-21 07:13:00 UTC
Created attachment 9670 [details]
screenshot showing the problem (all ASCII characters)

As requested: the screenshot - actually even though it shows spaces between some characters there are no spaces but underscores (_)
Comment 8 Ben Laenen 2007-04-21 07:21:52 UTC
Descenders are the parts of a letter below the base line, so "p" has a descender, "o" hasn't.

At this font size the underscore is unfortunately one pixel below the descender, so the screenshot doesn't help much...

Could you post a screenshot with this string once: "q|_|p" ?
Comment 9 Thorsten Kampe 2007-04-21 07:27:05 UTC
Created attachment 9671 [details]
q|_|p in size 17
Comment 10 Thorsten Kampe 2007-04-21 07:30:46 UTC
Created attachment 9672 [details]
q|_|p in size 16 (correctly displayed)
Comment 11 Thorsten Kampe 2007-04-21 07:31:29 UTC
Created attachment 9673 [details]
q|_|p in size 18 (correctly displayed)
Comment 12 Ben Laenen 2007-04-21 07:34:59 UTC
Then Denis was right, rxvt doesn't display the lowest pixel line at that size 17 (15 ppem). But I have no idea why it would do that...
Comment 13 Thorsten Kampe 2007-04-21 07:45:28 UTC
(In reply to comment #12)
> Then Denis was right, rxvt doesn't display the lowest pixel line at that size
> 17 (15 ppem). But I have no idea why it would do that...

Hm.

I tried Fixedsys and Lucida Console (both size 17). If rxvt doesn't display the "lowest pixel line at that size 17 (15 ppem)"  - then why only with DejaVu Sans Mono?!
Comment 14 Denis Jacquerye 2007-04-21 07:48:08 UTC
The size 17, attachment (id=9671), and size 18, attachment (id=9673), in your screenshots have the same characters, but size 17 has one line of pixel chopped.
Comment 15 Denis Jacquerye 2007-04-21 07:48:52 UTC
> The size 17, attachment (id=9671) [details], and size 18, attachment (id=9673) [details], in your
> screenshots have the same characters, but size 17 has one line of pixel
> chopped.
I mean they are identical pixelwise, with one line shopped off in size 17.
Comment 16 Ben Laenen 2007-04-21 08:02:46 UTC
So rxvt fixes the line height at 17 pixels there, and tries to select the appropriate font size to match it, but I have the impression it chooses wrongly, as the line height at that font size for DejaVu is 18 pixels.

Other fonts may only need 17 pixels at that size, or their underscore may be higher than in DejaVu...
Comment 17 anrdaemon 2015-04-20 21:01:17 UTC
Delete rxvt already. It is very old, unmaintained and unsupported.


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