Commit Graph

83 Commits

Author SHA1 Message Date
bakkeby
5c7d8ab1ad auto-sync: draw on idle to avoid flicker/tearing
st could easily tear/flicker with animation or other unattended
output. This commit eliminates most of the tear/flicker.

Before this commit, the display timing had two "modes":

- Interactively, st was waiting fixed `1000/xfps` ms after forwarding
  the kb/mouse event to the application and before drawing.

- Unattended, and specifically with animations, the draw frequency was
  throttled to `actionfps`. Animation at a higher rate would throttle
  and likely tear, and at lower rates it was tearing big frames
  (specifically, when one `read` didn't get a full "frame").

The interactive behavior was decent, but it was impossible to get good
unattended-draw behavior even with carefully chosen configuration.

This commit changes the behavior such that it draws on idle instead of
using fixed latency/frequency. This means that it tries to draw only
when it's very likely that the application has completed its output
(or after some duration without idle), so it mostly succeeds to avoid
tear, flicker, and partial drawing.

The config values minlatency/maxlatency replace xfps/actionfps and
define the range which the algorithm is allowed to wait from the
initial draw-trigger until the actual draw. The range enables the
flexibility to choose when to draw - when least likely to flicker.

It also unifies the interactive and unattended behavior and config
values, which makes the code simpler as well - without sacrificing
latency during interactive use, because typically interactively idle
arrives very quickly, so the wait is typically minlatency.

While it only slighly improves interactive behavior, for animations
and other unattended-drawing it improves greatly, as it effectively
adapts to any [animation] output rate without tearing, throttling,
redundant drawing, or unnecessary delays (sounds impossible, but it
works).
2020-05-20 14:15:57 +02:00
bakkeby
f34aef7e07 [PATCH] replace exit(3) by _exit(2) in signal handler sigchld() 2020-04-30 09:06:54 +02:00
bakkeby
b71d9f6669 [st][PATCH] externalpipe and externalpipein
This patch must be applied on the externalpipe patch. It adds the
function externalpipein to redirect the standard output of the external
command to the slave size of the pty, that is, as if the external
program had been manually executed on the terminal. It can be used to
send desired escape sequences to the terminal with a shortcut.

I created the patch to make use of the dynamic-colors program
(https://github.com/sos4nt/dynamic-colors) that uses the OSC escape
sequences to change the colors of the terminal. The program keeps the
last colorscheme selected in a file, so you can use it to select the
colorscheme for all newly opened terminals from that moment on. If you
want to change the color of the background and foreground independently
from the palette, you have to merge in the patch for the OSC escape
sequences 10, 11, and 12.

This patch includes the changes of the externalpipe sigaction patch to
prevent reseting the signal handler for SIGCHLD when the proces of the
external command exits.
2020-04-20 13:06:39 +02:00
bakkeby
5ad2174cf9 [st][PATCH] externalpipe sigaction
This patch should be applied on top of the externalpipe patch. It
prevents the reset of the signal handler set on SIGCHILD, when the
forked process that executes the external process exits. I opted for
switching from signal to sigaction instead of rearming the signal in the
sigchld function, just because it is the recommended function (although I
tried both ways and both worked).
2020-04-20 12:46:50 +02:00
bakkeby
bda5b50b99 [st][PATCH] OSC 10/11/12 fg, bg and cursor colors
Support for OSC escape sequences 10, 11 and 12 to modify the bg, fg and
cursor colors. I selected entries in the colorname table after the 255
position for defaultfg, defaultbg and defaultcs
2020-04-20 12:35:11 +02:00
bakkeby
24c9ea1e51 [st][PATCH] xclearwin clears the window
When an OCS sequence was used to change the bg color, the borders where
dirty. This simple patch just clears the window before the redraw of the
terminal when the bg color has been changed. This is apparently enough
and seams to be very smooth. There was a TODO comment for it on the st.c
file, which I removed.
2020-04-20 12:19:05 +02:00
bakkeby
ae97f681fc Update XIM cursor position only if changed
Updating XIM cursor position is expensive, so only update it when cursor
position changed.
2020-04-20 10:55:37 +02:00
bakkeby
60d1827504 just remove the EOF message 2020-04-20 10:53:23 +02:00
bakkeby
429ad84669 Fix small typos 2020-04-20 10:48:37 +02:00
bakkeby
18acc55f12 Launch scroll program with the default shell 2020-04-20 10:47:21 +02:00
bakkeby
2797bd3144 Fix style issue 2020-04-20 10:30:19 +02:00
bakkeby
fe6e6324d7 ttyread: test for EOF while reading tty
When a read operation returns 0 then it means that we arrived to the end of the
file, and new reads will return 0 unless you do some other operation such as
lseek(). This case happens with USB-232 adapters when they are unplugged.
2020-04-20 10:29:26 +02:00
bakkeby
2090981be3 Add support for scroll(1)
Scroll is a program that stores all the lines of its child and be used in st as
a way of implementing scrollback.

This solution is much better than implementing the scrollback in st itself
because having a different program allows to use it in any other program
without doing modifications to those programs.
2020-04-20 10:24:34 +02:00
bakkeby
2465559051 [st][PATCH] Update XIM cursor position only if changed
Updating XIM cursor position is expensive, so only update it when cursor
position changed.
2020-04-16 11:19:33 +02:00
bakkeby
56ff8cd7c7 [st][scrollback] Update for latest git 2020-04-05 18:09:50 +02:00
bakkeby
2de79ac677 OSC 52 - copy to clipboard: don't limit to 382 bytes (7a018b) 2020-03-24 14:25:10 +01:00
bakkeby
0d5ea3a3f2 CSIEscape, STREscape: use size_t for buffer length (b3ccac) 2020-03-24 14:23:28 +01:00
bakkeby
2da5aca965 STREscape: don't trim prematurely (d98c43) 2020-03-24 14:22:09 +01:00
bakkeby
5f311ddc78 base64dec: don't read out of bounds (0b2eb9) 2020-03-24 14:21:08 +01:00
bakkeby
78d1d7c181 selection: fix view to match actual selection on first cell (3c7ecf) 2020-03-24 13:52:56 +01:00
bakkeby
87c1d1e598 revert part of commit add0211522737b79dad990ccd65c8af63b5cc1dd (cae586) 2020-03-24 13:51:45 +01:00
bakkeby
d8b8f94d64 dont print color warning on color reset OSC 104 without parameter (294808) 2020-03-24 13:49:57 +01:00
bakkeby
fa3d47596d minor code-style, initialize var at the top of function (2d4ee4) 2020-03-24 13:49:01 +01:00
bakkeby
f86b641b5f use iswspace()/iswpunct() to find word delimiters (5cc1dd) 2020-03-24 13:41:19 +01:00
bakkeby
42f401b428 replace utf8strchr with wcschr (4b51e7) 2020-03-24 13:38:27 +01:00
bakkeby
f09c417473 be silent about explicitly unhandled mouse modes (9216d5) 2020-03-24 11:33:22 +01:00
bakkeby
e7cfd5ae16 better Input Method Editor (IME) support (35f7db) 2020-03-24 11:25:39 +01:00
bakkeby
9f1a2db7c5 Adding font2 patch as per request #3 2020-03-21 16:41:43 +01:00
bakkeby
cfecd195ba Adding relativeborder, fix-keyboard-input, iso14755, visualbell, rightclicktoplumb, boxdraw and keyboard-select patches 2019-09-17 15:16:22 +02:00
bakkeby
d52c5e4ce8 Adding scrollback patch 2019-09-16 15:31:58 +02:00
bakkeby
7615c2f0aa Adding fixime, newterm and opencopied patches 2019-09-16 12:40:07 +02:00
bakkeby
35e6403c69 Adding copyurl and disable-fonts patch 2019-09-16 10:40:16 +02:00
bakkeby
5d336c2796 Initial commit, adding alpha and anysize patches 2019-09-16 09:35:57 +02:00