Opened 5 years ago

Closed 4 years ago

#58313 closed defect (worksforme)

"xterm -fa FontSpec" (xfreetype) has some flush trouble (making it unusable)

Reported by: vallon (Justin) Owned by:
Priority: Normal Milestone:
Component: ports Version:
Keywords: Cc: jeremyhu (Jeremy Huddleston Sequoia), ThomasDickey (Thomas Dickey)
Port: xterm


cc: maintainer of xterm

Tried using "xterm -fa Courier-12" which uses XFreeType/font-config for font rendering. However, there are drawing/flushing issues. It behaves like an XFlush is missing:

  • On the local machine, a new xterm displays a prompt and scroll bars, etc. Typing into the window yield no response, but the input is being processed. If I resize or deactivate the window, the screen updates. If I press return enough times, the screen updates when it scrolls. If I run a command that generates a lot of output, the output is displayed (again, seemingly due to scrolling).
  • "ssh linuxhost xterm -fa Mono-12" works fine when displaying back to MacPort
  • From a linux X11 server, "ssh machost xterm -fa Courier-12" has same flushing trouble.

=> It appears it is MacPorts xterm that is the common factor.

I have removed all xrdb resources to insure it is not sensitive to any of my XResources, with no change in behavior.

$ port installed xterm or Xft2
The following ports are currently installed:
  Xft2 @2.3.3_0 (active)
  xterm @344_1 (active)

Change History (9)

comment:1 Changed 5 years ago by kencu (Ken)

We recently enabled double buffering and this sounds related to that.

comment:2 Changed 5 years ago by ThomasDickey (Thomas Dickey)

Cc: ThomasDickey added

comment:3 Changed 5 years ago by ThomasDickey (Thomas Dickey)

A different user commented on this, yesterday and send a proposed fix (for this, and a related problem with the blinking cursor).

comment:4 Changed 5 years ago by mthorn66

I believe I am the user that Thomas Dickey referred to. Until now I hadn't established a Github account so that I could comment on these tickets directly.

I have seen similar drawing issues with a recent MacPorts xterm when I use the faceName resource to specify the use of a TrueType font. In my case my typing is not shown until I make the window lose focus and then regain focus again. I verified that my problem went away if I rebuilt the xterm port without configuring --enable-double-buffer, so, yes, I think this problem was caused by the change to add --enable-double-buffer.

As Thomas Dickey writes, yesterday I found a possible fix in the xterm source code for this issue and forwarded it to him. In the process of doing this, I also found that telling xterm to use an underline cursor (-uc) causes xterm to update the display when the cursor is drawn and mitigates much of the problem.

comment:5 Changed 5 years ago by ThomasDickey (Thomas Dickey)

I went further, fixed a problem with "-hold" which did not paint the screen for double-buffering, and added a "buffered" resource setting to turn this on/ff. Mike reported a problem with scrolling performance, which (I think) is fixed in my 346o snapshot. I'd just turn it on all the time, but the window border isn't the right color. However the upcoming 347 will fix this bug report.

comment:6 Changed 5 years ago by ThomasDickey (Thomas Dickey)

I uploaded 347, which seems to be working reasonably well with double-buffering. (vttest shows me some cases to work on, but most people won't run vttest).

comment:7 Changed 5 years ago by vallon (Justin)

347 fixes this for me.

comment:8 Changed 4 years ago by vallon (Justin)

This is fixed for me. I do not see a way to mark this ticket as resolved.

comment:9 Changed 4 years ago by raimue (Rainer Müller)

Resolution: worksforme
Status: newclosed
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