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Add support for applications to use synchronized output mode (DECSET

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2026) to prevent screen tearing during rapid updates. When an
application sends SM ?2026, tmux buffers output until RM ?2026 is received
or a 1-second timeout expires.

From Chris Lloyd with the assistance of Claude Code, GitHub issue 4744.
This commit is contained in:
nicm
2025-12-17 11:49:29 +00:00
parent ce7eb22e3a
commit 1c7e164c22
7 changed files with 87 additions and 1 deletions
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51
screen-write.c
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@@ -894,6 +894,52 @@ screen_write_mode_clear(struct screen_write_ctx *ctx, int mode)
log_debug("%s: %s", __func__, screen_mode_to_string(mode));
}
/* Sync timeout callback. */
static void
screen_write_sync_callback(__unused int fd, __unused short events, void *arg)
{
struct window_pane *wp = arg;
log_debug("%s: %%%u sync timer expired", __func__, wp->id);
evtimer_del(&wp->sync_timer);
if (wp->base.mode & MODE_SYNC) {
wp->base.mode &= ~MODE_SYNC;
wp->flags |= PANE_REDRAW;
}
}
/* Start sync mode. */
void
screen_write_start_sync(struct window_pane *wp)
{
struct timeval tv = { .tv_sec = 1, .tv_usec = 0 };
if (wp == NULL)
return;
wp->base.mode |= MODE_SYNC;
if (!event_initialized(&wp->sync_timer))
evtimer_set(&wp->sync_timer, screen_write_sync_callback, wp);
evtimer_add(&wp->sync_timer, &tv);
log_debug("%s: %%%u started sync mode", __func__, wp->id);
}
/* Stop sync mode. */
void
screen_write_stop_sync(struct window_pane *wp)
{
if (wp == NULL)
return;
if (event_initialized(&wp->sync_timer))
evtimer_del(&wp->sync_timer);
wp->base.mode &= ~MODE_SYNC;
log_debug("%s: %%%u stopped sync mode", __func__, wp->id);
}
/* Cursor up by ny. */
void
screen_write_cursorup(struct screen_write_ctx *ctx, u_int ny)
@@ -1692,6 +1738,9 @@ screen_write_collect_flush(struct screen_write_ctx *ctx, int scroll_only,
u_int y, cx, cy, last, items = 0;
struct tty_ctx ttyctx;
if (s->mode & MODE_SYNC)
return;
if (ctx->scrolled != 0) {
log_debug("%s: scrolled %u (region %u-%u)", __func__,
ctx->scrolled, s->rupper, s->rlower);
@@ -1985,7 +2034,7 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
}
/* Write to the screen. */
if (!skip) {
if (!skip && !(s->mode & MODE_SYNC)) {
if (selected) {
screen_select_cell(s, &tmp_gc, gc);
ttyctx.cell = &tmp_gc;