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* bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts
@ 2020-07-21  1:36 Aaron Jensen
  2020-07-21  1:41 ` Aaron Jensen
                   ` (2 more replies)
  0 siblings, 3 replies; 11+ messages in thread
From: Aaron Jensen @ 2020-07-21  1:36 UTC (permalink / raw)
  To: 42452

Unfortunately, the repro isn't clear, but after using Emacs for some
time, the left side of the hollow box point will end up being slightly
thicker than the right side. After this happens, when the point is
moved, it will leave a faint line on the left side of the point.
Restarting emacs will cause the point to be a uniform box.

Note that I only use the hollow box when a window is not active. Also, I
have a hidpi display, so could it possibly be some sort of rounding
error somewhere?


In GNU Emacs 27.0.91 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.20)
 of 2020-07-05 built on pop-os
Repository revision: 247dcb4b1b1b4ea3d50b63d41c4efa58743f610d
Repository branch: emacs-27
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Pop!_OS 20.04 LTS

Recent messages:
config •    1ms • Emacs Lisp
config •    5ms • Clean shutdown
config •    7ms • Enable Default Theme
→★ loaded init.el in   93 ms
Explain-pause-mode enabled.
LSP :: ruby-ls:1891877 initialized successfully
Quit
Waiting for git... [2 times]
Appointment reminders enabled (no diary file found)
Added 5 events for today

Configured using:
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Configured features:
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ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF XFT ZLIB
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move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 709518 827723)
 (symbols 48 63320 464)
 (strings 32 214735 107138)
 (string-bytes 1 7450854)
 (vectors 16 119221)
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 (buffers 1000 26))

Aaron





^ permalink raw reply	[flat|nested] 11+ messages in thread

* bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts
  2020-07-21  1:36 bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts Aaron Jensen
@ 2020-07-21  1:41 ` Aaron Jensen
  2020-07-21  3:10   ` Aaron Jensen
  2020-07-21 14:18 ` Eli Zaretskii
  2021-03-28 22:21 ` Radon Rosborough
  2 siblings, 1 reply; 11+ messages in thread
From: Aaron Jensen @ 2020-07-21  1:41 UTC (permalink / raw)
  To: 42452

I'm going to try using --with-cairo for a bit to see if that helps.

Aaron





^ permalink raw reply	[flat|nested] 11+ messages in thread

* bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts
  2020-07-21  1:41 ` Aaron Jensen
@ 2020-07-21  3:10   ` Aaron Jensen
  0 siblings, 0 replies; 11+ messages in thread
From: Aaron Jensen @ 2020-07-21  3:10 UTC (permalink / raw)
  To: 42452

[-- Attachment #1: Type: text/plain, Size: 197 bytes --]

Forgot to attach a screenshot.

Aaron

On Mon, Jul 20, 2020 at 6:41 PM Aaron Jensen <aaronjensen@gmail.com> wrote:
>
> I'm going to try using --with-cairo for a bit to see if that helps.
>
> Aaron

[-- Attachment #2: Screenshot from 2020-07-20 18-28-30.png --]
[-- Type: image/png, Size: 52984 bytes --]

^ permalink raw reply	[flat|nested] 11+ messages in thread

* bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts
  2020-07-21  1:36 bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts Aaron Jensen
  2020-07-21  1:41 ` Aaron Jensen
@ 2020-07-21 14:18 ` Eli Zaretskii
  2021-03-28 22:21 ` Radon Rosborough
  2 siblings, 0 replies; 11+ messages in thread
From: Eli Zaretskii @ 2020-07-21 14:18 UTC (permalink / raw)
  To: Aaron Jensen; +Cc: 42452

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Mon, 20 Jul 2020 18:36:23 -0700
> 
> Unfortunately, the repro isn't clear, but after using Emacs for some
> time, the left side of the hollow box point will end up being slightly
> thicker than the right side. After this happens, when the point is
> moved, it will leave a faint line on the left side of the point.
> Restarting emacs will cause the point to be a uniform box.

I've scanned the X implementation of the hollow box, and couldn't find
where it does something that depends on HiDPI.  Can you spot anything
like that?





^ permalink raw reply	[flat|nested] 11+ messages in thread

* bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts
  2020-07-21  1:36 bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts Aaron Jensen
  2020-07-21  1:41 ` Aaron Jensen
  2020-07-21 14:18 ` Eli Zaretskii
@ 2021-03-28 22:21 ` Radon Rosborough
  2021-03-29  5:06   ` Eli Zaretskii
  2 siblings, 1 reply; 11+ messages in thread
From: Radon Rosborough @ 2021-03-28 22:21 UTC (permalink / raw)
  To: 42452

[-- Attachment #1: Type: text/plain, Size: 2467 bytes --]

I've been affected by this issue for some years, only on Linux to my
recollection, across multiple Emacs versions (26, 27, 28), and with
the same behavior described by Aaron.

After some time using Emacs---the trigger is unclear---Emacs enters a
state where the hollow box cursor is drawn incorrectly. Specifically,
the lines of the hollow box cursor are drawn with a thickness of 2
pixels rather than 1 pixel. To make things a bit more confusing, only
the bottom, left, and right lines of the hollow box experience this. I
believe this is because the rectangle drawing is clipped to the
current glyph row (though not the current glyph column), so the extra
pixels on the top fall outside the clip region and get dropped.

Here are screenshots showing the behavior at a pixel level, for
comparison: https://imgur.com/a/L84ekeS

The relevant code is in the function x_draw_hollow_cursor, here:
https://github.com/emacs-mirror/emacs/blob/96dd0196c28bc36779584e47fffcca433c9309cd/src/xterm.c#L9234

By compiling Emacs with debugging symbols and stepping through
x_draw_hollow_cursor with GDB, I verified that all the arguments
passed to XDrawRectangle (via x_draw_rectangle) are identical between
an instance of Emacs exhibiting the bug and one that is fine.

I've attached a patch that appears to resolve the problem for me.

What we are doing in this patch is overriding the graphics context
configuration so that line_width is set to 1, rather than the default
of 0. There is somewhat detailed documentation from xlib on the
meaning of the line_width argument, and how to set it via XChangeGC,
here: https://tronche.com/gui/x/xlib/GC/manipulating.html

In short, a line_width of 0 means "draw a line of width 1 pixel, but
use a device-dependent algorithm to do so, which may have higher
performance". Unlike setting line_width to 1, setting it to 0 does not
make any guarantees about the exact pixels that are rendered as part
of the line. Apparently, there is a bug in the X server's
device-dependent graphics code, or perhaps the graphics driver, which
causes the "device-dependent algorithm" to be buggy under some
circumstances, and draw a line of width 2 when a line of width 1 is
requested.

Other interesting behavior: If I set line_width explicitly to 2 rather
than to 1, then the graphical artifacts mentioned in the initial bug
report occur unconditionally, every time a hollow box cursor is
rendered.

Would this change be appropriate to include in Emacs?

[-- Attachment #2: line_width.patch --]
[-- Type: application/x-patch, Size: 874 bytes --]

^ permalink raw reply	[flat|nested] 11+ messages in thread

* bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts
  2021-03-28 22:21 ` Radon Rosborough
@ 2021-03-29  5:06   ` Eli Zaretskii
  2021-04-02 21:05     ` Radon Rosborough
  2021-05-13  9:44     ` Lars Ingebrigtsen
  0 siblings, 2 replies; 11+ messages in thread
From: Eli Zaretskii @ 2021-03-29  5:06 UTC (permalink / raw)
  To: Radon Rosborough; +Cc: 42452

> From: Radon Rosborough <radon.neon@gmail.com>
> Date: Sun, 28 Mar 2021 15:21:47 -0700
> 
> I've attached a patch that appears to resolve the problem for me.
> 
> What we are doing in this patch is overriding the graphics context
> configuration so that line_width is set to 1, rather than the default
> of 0. There is somewhat detailed documentation from xlib on the
> meaning of the line_width argument, and how to set it via XChangeGC,
> here: https://tronche.com/gui/x/xlib/GC/manipulating.html
> 
> In short, a line_width of 0 means "draw a line of width 1 pixel, but
> use a device-dependent algorithm to do so, which may have higher
> performance". Unlike setting line_width to 1, setting it to 0 does not
> make any guarantees about the exact pixels that are rendered as part
> of the line. Apparently, there is a bug in the X server's
> device-dependent graphics code, or perhaps the graphics driver, which
> causes the "device-dependent algorithm" to be buggy under some
> circumstances, and draw a line of width 2 when a line of width 1 is
> requested.

Since this happens for unknown reasons, most probably some misfeature
of the X server, the change to use an explicit line thickness is a
debugging device.  As such, it shouldn't be the default; instead,
let's have a Lisp variable that gives the thickness, by default zero,
and let users affected by this issue set the variable to whatever
value that fixes the problem.

> Other interesting behavior: If I set line_width explicitly to 2 rather
> than to 1, then the graphical artifacts mentioned in the initial bug
> report occur unconditionally, every time a hollow box cursor is
> rendered.

I cannot see anything when I go to the URL you posted, just a blank
screen (a frequent problem with imgur.com), so I don't think I
understand what "artifacts" are you alluding to.  Does Emacs leave
traces of the hollow cursor when it moves it to another location?  Or
are you alluding to the different thickness of some of the borders of
the cursor?

Thanks.





^ permalink raw reply	[flat|nested] 11+ messages in thread

* bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts
  2021-03-29  5:06   ` Eli Zaretskii
@ 2021-04-02 21:05     ` Radon Rosborough
  2021-05-13  9:44     ` Lars Ingebrigtsen
  1 sibling, 0 replies; 11+ messages in thread
From: Radon Rosborough @ 2021-04-02 21:05 UTC (permalink / raw)
  To: 42452


[-- Attachment #1.1: Type: text/plain, Size: 107 bytes --]

The Imgur images look fine to me, but I've attached them to this email
additionally, for your convenience.

[-- Attachment #1.2: Type: text/html, Size: 149 bytes --]

[-- Attachment #2: screenshot1.png --]
[-- Type: image/png, Size: 2518 bytes --]

[-- Attachment #3: screenshot2.png --]
[-- Type: image/png, Size: 3512 bytes --]

^ permalink raw reply	[flat|nested] 11+ messages in thread

* bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts
  2021-03-29  5:06   ` Eli Zaretskii
  2021-04-02 21:05     ` Radon Rosborough
@ 2021-05-13  9:44     ` Lars Ingebrigtsen
  2021-05-13 10:26       ` Eli Zaretskii
  1 sibling, 1 reply; 11+ messages in thread
From: Lars Ingebrigtsen @ 2021-05-13  9:44 UTC (permalink / raw)
  To: Eli Zaretskii; +Cc: 42452, Radon Rosborough

Eli Zaretskii <eliz@gnu.org> writes:

> Since this happens for unknown reasons, most probably some misfeature
> of the X server, the change to use an explicit line thickness is a
> debugging device.  As such, it shouldn't be the default; instead,
> let's have a Lisp variable that gives the thickness, by default zero,
> and let users affected by this issue set the variable to whatever
> value that fixes the problem.

The patch fixes an issue under some X implementations, and doesn't seem
to have any negative effects (that I can see), so I've applied Rodon's
patch.

Allowing users to control the width of the lines sounds like a nice
feature, but I don't think anybody's requested it, so I'm not sure
holding up fixing this bug warrants waiting for that to be implemented.

It's easy enough to implement in xterm.c, but (for instance) the Windows
implementation uses FrameRect, which doesn't allow specifying the line
thickness?  I'd rather not have a feature divergence here.

So I'm closing this bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no





^ permalink raw reply	[flat|nested] 11+ messages in thread

* bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts
  2021-05-13  9:44     ` Lars Ingebrigtsen
@ 2021-05-13 10:26       ` Eli Zaretskii
  2021-05-16 13:23         ` Lars Ingebrigtsen
  0 siblings, 1 reply; 11+ messages in thread
From: Eli Zaretskii @ 2021-05-13 10:26 UTC (permalink / raw)
  To: Lars Ingebrigtsen; +Cc: 42452, radon.neon

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Radon Rosborough <radon.neon@gmail.com>,  42452@debbugs.gnu.org
> Date: Thu, 13 May 2021 11:44:23 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Since this happens for unknown reasons, most probably some misfeature
> > of the X server, the change to use an explicit line thickness is a
> > debugging device.  As such, it shouldn't be the default; instead,
> > let's have a Lisp variable that gives the thickness, by default zero,
> > and let users affected by this issue set the variable to whatever
> > value that fixes the problem.
> 
> The patch fixes an issue under some X implementations, and doesn't seem
> to have any negative effects (that I can see), so I've applied Rodon's
> patch.
> 
> Allowing users to control the width of the lines sounds like a nice
> feature, but I don't think anybody's requested it, so I'm not sure
> holding up fixing this bug warrants waiting for that to be implemented.
> 
> It's easy enough to implement in xterm.c, but (for instance) the Windows
> implementation uses FrameRect, which doesn't allow specifying the line
> thickness?  I'd rather not have a feature divergence here.

The problem is only on X, so the variable should be X-specific.  It is
not unheard of to have such debugging-related variables be
system-specific.





^ permalink raw reply	[flat|nested] 11+ messages in thread

* bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts
  2021-05-13 10:26       ` Eli Zaretskii
@ 2021-05-16 13:23         ` Lars Ingebrigtsen
  2021-05-16 13:25           ` Eli Zaretskii
  0 siblings, 1 reply; 11+ messages in thread
From: Lars Ingebrigtsen @ 2021-05-16 13:23 UTC (permalink / raw)
  To: Eli Zaretskii; +Cc: 42452, radon.neon

Eli Zaretskii <eliz@gnu.org> writes:

> The problem is only on X, so the variable should be X-specific.  It is
> not unheard of to have such debugging-related variables be
> system-specific.

That's true -- and if it was purely a work-around, then I'd see no
problems with adding the variable.  But in this case, we're talking
about allowing customising the line width of the hollow cursor, which
sounds like something that people might find useful in general.

And I'd really prefer to have that work consistently across all
(significant) platforms.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no





^ permalink raw reply	[flat|nested] 11+ messages in thread

* bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts
  2021-05-16 13:23         ` Lars Ingebrigtsen
@ 2021-05-16 13:25           ` Eli Zaretskii
  0 siblings, 0 replies; 11+ messages in thread
From: Eli Zaretskii @ 2021-05-16 13:25 UTC (permalink / raw)
  To: Lars Ingebrigtsen; +Cc: 42452, radon.neon

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: radon.neon@gmail.com,  42452@debbugs.gnu.org
> Date: Sun, 16 May 2021 15:23:14 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > The problem is only on X, so the variable should be X-specific.  It is
> > not unheard of to have such debugging-related variables be
> > system-specific.
> 
> That's true -- and if it was purely a work-around, then I'd see no
> problems with adding the variable.  But in this case, we're talking
> about allowing customising the line width of the hollow cursor, which
> sounds like something that people might find useful in general.

No, we are talking about code that no one really understands why it's
needed, and why only on some systems.  Which means we also don't
understand whether it could have some adverse effects on some systems.






^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2021-05-16 13:25 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-21  1:36 bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts Aaron Jensen
2020-07-21  1:41 ` Aaron Jensen
2020-07-21  3:10   ` Aaron Jensen
2020-07-21 14:18 ` Eli Zaretskii
2021-03-28 22:21 ` Radon Rosborough
2021-03-29  5:06   ` Eli Zaretskii
2021-04-02 21:05     ` Radon Rosborough
2021-05-13  9:44     ` Lars Ingebrigtsen
2021-05-13 10:26       ` Eli Zaretskii
2021-05-16 13:23         ` Lars Ingebrigtsen
2021-05-16 13:25           ` Eli Zaretskii

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