sowm: rounded corners

Makefile

@@ -10,7 +10,7 @@ config.h:
 	cp config.def.h config.h
 
 sowm:
-	$(CC) -O3 $(CFLAGS) -lX11 $(LDFLAGS) -o sowm sowm.c
+	$(CC) -O3 $(CFLAGS) -lX11 -lXext $(LDFLAGS) -o sowm sowm.c
 
 install: all
 	install -Dm755 sowm $(DESTDIR)$(BINDIR)/sowm

config.def.h

@@ -2,6 +2,7 @@
 #define CONFIG_H
 
 #define MOD Mod4Mask
+#define ROUND_CORNERS 20
 
 const char* menu[]    = {"dmenu_run",      0};
 const char* term[]    = {"st",             0};

sowm.c

@@ -4,6 +4,7 @@
 #include <X11/XF86keysym.h>
 #include <X11/keysym.h>
 #include <X11/XKBlib.h>
+#include <X11/extensions/shape.h>
 #include <stdlib.h>
 #include <signal.h>
 #include <unistd.h>
@@ -61,6 +62,9 @@ void notify_motion(XEvent *e) {
         wy + (mouse.button == 1 ? yd : 0),
         MAX(1, ww + (mouse.button == 3 ? xd : 0)),
         MAX(1, wh + (mouse.button == 3 ? yd : 0)));
+
+    if (mouse.button == 3)
+        win_round_corners(mouse.subwindow, ROUND_CORNERS);
 }
 
 void key_press(XEvent *e) {
@@ -142,6 +146,41 @@ void win_fs(const Arg arg) {
     } else {
         XMoveResizeWindow(d, cur->w, cur->wx, cur->wy, cur->ww, cur->wh);
     }
+
+    win_round_corners(cur->w, cur->f ? 0 : ROUND_CORNERS);
+}
+
+void win_round_corners(Window w, int rad) {
+    unsigned int ww, wh, dia = 2 * rad;
+
+    win_size(w, &(int){1}, &(int){1}, &ww, &wh);
+
+    if (ww < dia || wh < dia) return;
+
+    Pixmap mask = XCreatePixmap(d, w, ww, wh, 1);
+
+    if (!mask) return;
+
+    XGCValues xgcv;
+    GC shape_gc = XCreateGC(d, mask, 0, &xgcv);
+
+    if (!shape_gc) {
+        XFreePixmap(d, mask);
+        return;
+    }
+
+    XSetForeground(d, shape_gc, 0);
+    XFillRectangle(d, mask, shape_gc, 0, 0, ww, wh);
+    XSetForeground(d, shape_gc, 1);
+    XFillArc(d, mask, shape_gc, 0, 0, dia, dia, 0, 23040);
+    XFillArc(d, mask, shape_gc, ww-dia-1, 0, dia, dia, 0, 23040);
+    XFillArc(d, mask, shape_gc, 0, wh-dia-1, dia, dia, 0, 23040);
+    XFillArc(d, mask, shape_gc, ww-dia-1, wh-dia-1, dia, dia, 0, 23040);
+    XFillRectangle(d, mask, shape_gc, rad, 0, ww-dia, wh);
+    XFillRectangle(d, mask, shape_gc, 0, rad, ww, wh-dia);
+    XShapeCombineMask(d, w, ShapeBounding, 0, 0, mask, ShapeSet);
+    XFreePixmap(d, mask);
+    XFreeGC(d, shape_gc);
 }
 
 void win_to_ws(const Arg arg) {
@@ -205,6 +244,8 @@ void configure_request(XEvent *e) {
         .sibling    = ev->above,
         .stack_mode = ev->detail
     });
+
+    win_round_corners(ev->window, ROUND_CORNERS);
 }
 
 void map_request(XEvent *e) {
@@ -217,6 +258,7 @@ void map_request(XEvent *e) {
 
     if (wx + wy == 0) win_center((Arg){0});
 
+    win_round_corners(w, ROUND_CORNERS);
     XMapWindow(d, w);
     win_focus(list->prev);
 }

sowm.h

@@ -51,6 +51,7 @@ void win_focus(client *c);
 void win_kill(const Arg arg);
 void win_prev(const Arg arg);
 void win_next(const Arg arg);
+void win_round_corners(Window w, int rad);
 void win_to_ws(const Arg arg);
 void ws_go(const Arg arg);