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commit bbba95cd3dac12e9a83a44e60fa546a3de0a3701
parent 194d3409bb68d0dc19b2089b27d1d88b309e6d15
Author: Chris Down <chris@chrisdown.name>
Date:   Mon, 27 Dec 2021 13:45:22 +0000

[dwm][patches][noborderflicker] Add noborderflicker patch

Diffstat:
A
dwm.suckless.org/patches/noborderflicker/dwm-noborderflicker-20211227-8657affa2a61.diff
 | 
41
+++++++++++++++++++++++++++++++++++++++++
A
dwm.suckless.org/patches/noborderflicker/index.md
 | 
22
++++++++++++++++++++++

2 files changed, 63 insertions(+), 0 deletions(-)
diff --git a/dwm.suckless.org/patches/noborderflicker/dwm-noborderflicker-20211227-8657affa2a61.diff b/dwm.suckless.org/patches/noborderflicker/dwm-noborderflicker-20211227-8657affa2a61.diff
@@ -0,0 +1,41 @@
+diff --git dwm.c dwm.c
+index a96f33c..50ccf00 100644
+--- dwm.c
++++ dwm.c
+@@ -236,6 +236,7 @@ static int xerrorstart(Display *dpy, XErrorEvent *ee);
+ static void zoom(const Arg *arg);
+ 
+ /* variables */
++static Client *lastfocused = NULL;
+ static const char broken[] = "broken";
+ static char stext[256];
+ static int screen;
+@@ -799,7 +800,10 @@ focus(Client *c)
+ 		detachstack(c);
+ 		attachstack(c);
+ 		grabbuttons(c, 1);
++		/* set new focused border first to avoid flickering */
+ 		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
++		if (lastfocused)
++			XSetWindowBorder(dpy, lastfocused->win, scheme[SchemeNorm][ColBorder].pixel);
+ 		setfocus(c);
+ 	} else {
+ 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
+@@ -1758,7 +1762,7 @@ unfocus(Client *c, int setfocus)
+ 	if (!c)
+ 		return;
+ 	grabbuttons(c, 0);
+-	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
++	lastfocused = c;
+ 	if (setfocus) {
+ 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
+ 		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
+@@ -1784,6 +1788,8 @@ unmanage(Client *c, int destroyed)
+ 		XSetErrorHandler(xerror);
+ 		XUngrabServer(dpy);
+ 	}
++	if (lastfocused == c)
++		lastfocused = NULL;
+ 	free(c);
+ 	focus(NULL);
+ 	updateclientlist();
diff --git a/dwm.suckless.org/patches/noborderflicker/index.md b/dwm.suckless.org/patches/noborderflicker/index.md
@@ -0,0 +1,22 @@
+noborderflicker
+===============
+
+Description
+-----------
+Depending on machine configuration and luck, borders may flicker when changing
+focus to a new client. This happens because there may be a tangible delay
+between unfocus(), which sets the normal border, and focus(), which sets the
+focused border.
+
+This patch avoids that flickering by deferring drawing the normal border around
+the newly unfocused client until the new focused border has already been drawn.
+Even better, in reality, these are now close enough together that it's very
+likely the two updates will be rendered on the same monitor refresh.
+
+Download
+--------
+* [dwm-noborderflicker-20211227-8657affa2a61.diff](dwm-noborderflicker-20211227-8657affa2a61.diff)
+
+Authors
+-------
+* Chris Down - <chris@chrisdown.name>