From d6a060dfeeef28548e6c6b1fcb92c73c4884cd6c Mon Sep 17 00:00:00 2001
From: "Avi Halachmi (:avih)" <avihpit@yahoo.com>
Date: Tue, 12 May 2020 11:40:19 +0300
Subject: [PATCH] visual bell: add circle rendering mode

This commit experiments with alternative rendering of visual bell,
and as such it's extensively/excessively configurable.

It renders an overlay of a circle with configurable colors (base,
outline), position and size. Defaults to the center of the window.

Size can be relative to window or chars width, and allows for instance
to place it at the middle/side of a top/bottom tmux status-bar with
exact char height to make it look like a flashing LED at the bar, etc.
---
 config.def.h | 11 +++++++++++
 x.c          | 21 ++++++++++++++++++++-
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/config.def.h b/config.def.h
index fe07204..927dfea 100644
--- a/config.def.h
+++ b/config.def.h
@@ -77,6 +77,17 @@ static int vbelltimeout = 150;
 // #define VBCELL 1  /* all cells - whole screen */
 // #define VBCELL y==bottom && x>right-2  /* bottom-right */
 
+static int vbellmode = 1;
+/* vbellmode: 0: invert cells. 1: draw a circle with these parameters:
+ * - base and outline colors (colorname index - see below)
+ * - radius: relative to window width, or if negative: relative to cell-width
+ * - position: relative to window width/height (0 and 1 are at the edges) */
+static int vbellcolor = 3;
+static int vbellcolor_outline = 1;
+static float vbellradius = 0.03;
+static float vbellx = 0.5;
+static float vbelly = 0.5;
+
 /* default TERM value */
 char *termname = "st-256color";
 
diff --git a/x.c b/x.c
index 44d5a8d..189aa1c 100644
--- a/x.c
+++ b/x.c
@@ -1600,7 +1600,7 @@ static int
 isvbellcell(int x, int y)
 {
 	int right = win.tw / win.cw - 1, bottom = win.th / win.ch - 1;
-	return VBCELL;  /* logic condition defined at config.h */
+	return vbellmode == 0 && (VBCELL);  /* logic defined at config.h */
 }
 
 static void
@@ -1613,6 +1613,22 @@ vbellbegin() {
 	XFlush(xw.dpy);
 }
 
+static void
+xfillcircle(int x, int y, int r, uint color_ix)
+{
+	XSetForeground(xw.dpy, dc.gc, dc.col[color_ix].pixel);
+	XFillArc(xw.dpy, xw.buf, dc.gc, x - r, y - r, r * 2, r * 2, 0, 360*64);
+}
+
+static void
+xdrawvbell() {
+	int r = round(vbellradius * (vbellradius > 0 ? win.w : -win.cw));
+	int x = borderpx + r + vbellx * (win.tw - 2 * r);
+	int y = borderpx + r + vbelly * (win.th - 2 * r);
+	xfillcircle(x, y, r, vbellcolor_outline);
+	xfillcircle(x, y, r / 1.2, vbellcolor); /* 1.2 - an artistic choice */
+}
+
 int
 xstartdraw(void)
 {
@@ -1655,6 +1671,9 @@ xdrawline(Line line, int x1, int y1, int x2)
 void
 xfinishdraw(void)
 {
+	if (vbellset && vbellmode == 1)
+		xdrawvbell();
+
 	XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, win.w,
 			win.h, 0, 0);
 	XSetForeground(xw.dpy, dc.gc,

base-commit: 045a0fab4f80b57f4a982ae6bc5f33fe21d66111
prerequisite-patch-id: d5f30ab22e0caa901341e31c40606787c3921821
-- 
2.17.1