auto-sync patch
This commit is contained in:
Luke Smith
parent
b35e4f5727
commit
4f44d2d13f
2 changed files with 65 additions and 68 deletions
13
config.h
13
config.h
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@ -42,9 +42,14 @@ static unsigned int tripleclicktimeout = 600;
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/* alt screens */
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int allowaltscreen = 1;
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/* frames per second st should at maximum draw to the screen */
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static unsigned int xfps = 120;
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static unsigned int actionfps = 30;
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/*
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* draw latency range in ms - from new content/keypress/etc until drawing.
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* within this range, st draws when content stops arriving (idle). mostly it's
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* near minlatency, but it waits longer for slow updates to avoid partial draw.
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* low minlatency will tear/flicker more, as it can "detect" idle too early.
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*/
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static double minlatency = 8;
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static double maxlatency = 33;
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/*
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* blinking timeout (set to 0 to disable blinking) for the terminal blinking
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@ -197,8 +202,6 @@ ResourcePref resources[] = {
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{ "cursorColor", STRING, &colorname[256] },
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{ "termname", STRING, &termname },
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{ "shell", STRING, &shell },
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{ "xfps", INTEGER, &xfps },
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{ "actionfps", INTEGER, &actionfps },
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{ "blinktimeout", INTEGER, &blinktimeout },
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{ "bellvolume", INTEGER, &bellvolume },
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{ "tabspaces", INTEGER, &tabspaces },
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110
x.c
110
x.c
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@ -1956,10 +1956,9 @@ run(void)
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XEvent ev;
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int w = win.w, h = win.h;
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fd_set rfd;
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int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
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int ttyfd;
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struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
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long deltatime;
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int xfd = XConnectionNumber(xw.dpy), ttyfd, xev, drawing;
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struct timespec seltv, *tv, now, lastblink, trigger;
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double timeout;
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/* Waiting for window mapping */
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do {
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@ -1980,51 +1979,31 @@ run(void)
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ttyfd = ttynew(opt_line, shell, opt_io, opt_cmd);
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cresize(w, h);
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clock_gettime(CLOCK_MONOTONIC, &last);
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lastblink = last;
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for (xev = actionfps;;) {
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for (timeout = -1, drawing = 0, lastblink = (struct timespec){0};;) {
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FD_ZERO(&rfd);
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FD_SET(ttyfd, &rfd);
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FD_SET(xfd, &rfd);
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if (XPending(xw.dpy))
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timeout = 0; /* existing events might not set xfd */
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seltv.tv_sec = timeout / 1E3;
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seltv.tv_nsec = 1E6 * (timeout - 1E3 * seltv.tv_sec);
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tv = timeout >= 0 ? &seltv : NULL;
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if (pselect(MAX(xfd, ttyfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
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if (errno == EINTR)
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continue;
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die("select failed: %s\n", strerror(errno));
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}
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if (FD_ISSET(ttyfd, &rfd)) {
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ttyread();
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if (blinktimeout) {
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blinkset = tattrset(ATTR_BLINK);
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if (!blinkset)
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MODBIT(win.mode, 0, MODE_BLINK);
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}
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}
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if (FD_ISSET(xfd, &rfd))
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xev = actionfps;
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clock_gettime(CLOCK_MONOTONIC, &now);
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drawtimeout.tv_sec = 0;
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drawtimeout.tv_nsec = (1000 * 1E6)/ xfps;
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tv = &drawtimeout;
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dodraw = 0;
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if (blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
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tsetdirtattr(ATTR_BLINK);
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win.mode ^= MODE_BLINK;
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lastblink = now;
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dodraw = 1;
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}
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deltatime = TIMEDIFF(now, last);
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if (deltatime > 1000 / (xev ? xfps : actionfps)) {
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dodraw = 1;
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last = now;
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}
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if (FD_ISSET(ttyfd, &rfd))
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ttyread();
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if (dodraw) {
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xev = 0;
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while (XPending(xw.dpy)) {
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xev = 1;
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XNextEvent(xw.dpy, &ev);
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if (XFilterEvent(&ev, None))
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continue;
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@ -2032,30 +2011,45 @@ run(void)
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(handler[ev.type])(&ev);
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}
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/*
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* To reduce flicker and tearing, when new content or event
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* triggers drawing, we first wait a bit to ensure we got
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* everything, and if nothing new arrives - we draw.
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* We start with trying to wait minlatency ms. If more content
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* arrives sooner, we retry with shorter and shorter preiods,
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* and eventually draw even without idle after maxlatency ms.
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* Typically this results in low latency while interacting,
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* maximum latency intervals during `cat huge.txt`, and perfect
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* sync with periodic updates from animations/key-repeats/etc.
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*/
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if (FD_ISSET(ttyfd, &rfd) || xev) {
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if (!drawing) {
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trigger = now;
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drawing = 1;
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}
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timeout = (maxlatency - TIMEDIFF(now, trigger)) \
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/ maxlatency * minlatency;
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if (timeout > 0)
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continue; /* we have time, try to find idle */
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}
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/* idle detected or maxlatency exhausted -> draw */
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timeout = -1;
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if (blinktimeout && tattrset(ATTR_BLINK)) {
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timeout = blinktimeout - TIMEDIFF(now, lastblink);
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if (timeout <= 0) {
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if (-timeout > blinktimeout) /* start visible */
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win.mode |= MODE_BLINK;
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win.mode ^= MODE_BLINK;
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tsetdirtattr(ATTR_BLINK);
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lastblink = now;
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timeout = blinktimeout;
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}
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}
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draw();
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XFlush(xw.dpy);
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if (xev && !FD_ISSET(xfd, &rfd))
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xev--;
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if (!FD_ISSET(ttyfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
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if (blinkset) {
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if (TIMEDIFF(now, lastblink) \
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> blinktimeout) {
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drawtimeout.tv_nsec = 1000;
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} else {
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drawtimeout.tv_nsec = (1E6 * \
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(blinktimeout - \
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TIMEDIFF(now,
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lastblink)));
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}
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drawtimeout.tv_sec = \
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drawtimeout.tv_nsec / 1E9;
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drawtimeout.tv_nsec %= (long)1E9;
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} else {
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tv = NULL;
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}
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}
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}
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drawing = 0;
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}
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}
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