Move rainbow-ui into a separate thread

config.def.h

@@ -17,7 +17,8 @@ static const char col_gray2[]       = "#444444";
 static const char col_gray3[]       = "#bbbbbb";
 static const char col_gray4[]       = "#eeeeee";
 static const char col_cyan[]        = "#005577";
-static const unsigned int baralpha = 0xd0;
+static const useconds_t rainbowrate = 100000;
+static const unsigned int baralpha    = 0xd0;
 static const unsigned int borderalpha = OPAQUE;
 static const char *colors[][3]      = {
 	/*               fg         bg         border   */

config.h

@@ -17,6 +17,7 @@ static const char col_gray2[]       = "#444444";
 static const char col_gray3[]       = "#bbbbbb";
 static const char col_gray4[]       = "#eeeeee";
 static const char col_cyan[]        = "#005577";
+static const useconds_t rainbowrate = 100000;
 static const unsigned int baralpha    = 0xd0;
 static const unsigned int borderalpha = OPAQUE;
 static const char *colors[][3]      = {

config.mk

@@ -22,7 +22,7 @@ FREETYPEINC = /usr/include/freetype2
 
 # includes and libs
 INCS = -I${X11INC} -I${FREETYPEINC}
-LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS} -lXrender
+LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS} -lXrender -lpthread
 
 # flags
 CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}

dwm.c

@@ -22,6 +22,7 @@
  */
 #include <errno.h>
 #include <locale.h>
+#include <pthread.h>
 #include <signal.h>
 #include <stdarg.h>
 #include <stdio.h>
@@ -42,6 +43,7 @@
 #include <X11/Xft/Xft.h>
 
 #include "drw.h"
+#include "rainbow.c"
 #include "util.h"
 
 /* macros */
@@ -214,6 +216,7 @@ static Client *nexttiled(Client *c);
 static void pop(Client *);
 static void propertynotify(XEvent *e);
 static void quit(const Arg *arg);
+static void* rainbowthread(void *arg);
 static Monitor *recttomon(int x, int y, int w, int h);
 static void removesystrayicon(Client *i);
 static void resize(Client *c, int x, int y, int w, int h, int interact);
@@ -298,7 +301,7 @@ static void (*handler[LASTEvent]) (XEvent *) = {
 	[ResizeRequest] = resizerequest,
 	[UnmapNotify] = unmapnotify
 };
-static Atom wmatom[WMLast], netatom[NetLast], xatom[XLast];
+static Atom wmatom[WMLast], netatom[NetLast], xatom[XLast], rainbowatom;
 static int running = 1;
 static Cur *cursor[CurLast];
 static Clr **scheme;
@@ -612,6 +615,11 @@ clientmessage(XEvent *e)
 		}
 		return;
 	}
+	if (cme->message_type == rainbowatom) {
+		runrainbow(&scheme[SchemeSel][ColBg]);
+		drawbars();
+		return;
+	}
 	if (!c)
 		return;
 	if (cme->message_type == netatom[NetWMState]) {
@@ -1393,6 +1401,16 @@ quit(const Arg *arg)
 	running = 0;
 }
 
+void *
+rainbowthread(void *arg) {
+	while (1) {
+		usleep(rainbowrate);
+		sendevent(0, rainbowatom, StructureNotifyMask, CurrentTime, 0, 0, 0, 0);
+		XSync(dpy, False);
+	}
+	return NULL;
+}
+
 Monitor *
 recttomon(int x, int y, int w, int h)
 {
@@ -1766,6 +1784,7 @@ setup(void)
 	bh = drw->fonts->h + 2;
 	updategeom();
 	/* init atoms */
+	rainbowatom = XInternAtom(dpy, "RAINBOW_ATOM", False);
 	utf8string = XInternAtom(dpy, "UTF8_STRING", False);
 	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
@@ -1800,6 +1819,9 @@ setup(void)
 	/* init bars */
 	updatebars();
 	updatestatus();
+	/* init rainbow */
+	pthread_t thread;
+	pthread_create(&thread, NULL, &rainbowthread, NULL);
 	/* supporting window for NetWMCheck */
 	wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
 	XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
@@ -2559,6 +2581,7 @@ zoom(const Arg *arg)
 int
 main(int argc, char *argv[])
 {
+	XInitThreads();
 	if (argc == 2 && !strcmp("-v", argv[1]))
 		die("dwm-"VERSION);
 	else if (argc != 1)

rainbow.c

@@ -0,0 +1,40 @@
+static int rainbowcurrentcolor     = 0;
+static const int rainbowcolorrange = 100;
+
+static unsigned int rainbowgetcolor(double ratio);
+static void runrainbow(Clr *color);
+
+unsigned int
+rainbowgetcolor(double ratio)
+{
+    /* we want to normalize ratio so that it fits in to 6 regions */
+    /* where each region is 256 units long */
+    int normalized = (int) (ratio * 256 * 6);
+
+    /* find the distance to the start of the closest region */
+    int x = normalized % 256;
+
+    int red = 0, grn = 0, blu = 0;
+    switch(normalized / 256)
+    {
+    case 0: red = 255;      grn = x;        blu = 0;       break;//red
+    case 1: red = 255 - x;  grn = 255;      blu = 0;       break;//yellow
+    case 2: red = 0;        grn = 255;      blu = x;       break;//green
+    case 3: red = 0;        grn = 255 - x;  blu = 255;     break;//cyan
+    case 4: red = x;        grn = 0;        blu = 255;     break;//blue
+    case 5: red = 255;      grn = 0;        blu = 255 - x; break;//magenta
+    }
+
+    return red + (grn << 8) + (blu << 16);
+}
+
+void
+runrainbow(Clr *color) {
+	rainbowcurrentcolor++;
+	if (rainbowcurrentcolor > rainbowcolorrange)
+        rainbowcurrentcolor = 1;
+	unsigned int newColor =
+        rainbowgetcolor((double) (rainbowcurrentcolor) / rainbowcolorrange);
+	if (newColor > 0)
+		color->pixel = newColor;
+}