Adding background image reload patch ref. pull request #62

README.md

@@ -15,6 +15,8 @@ Refer to [https://st.suckless.org/](https://st.suckless.org/) for details on the
 
 ### Changelog:
 
+2022-04-11 - Added the background image reload patch
+
 2022-03-10 - Added the background image patch
 
 2022-02-24 - Upgraded to st 0.8.5 e823e23, 2022-02-17 - removing osc_10_11_12_2 patch as no longer relevant
@@ -101,6 +103,9 @@ Refer to [https://st.suckless.org/](https://st.suckless.org/) for details on the
       - draws a background image in farbfeld format in place of the defaultbg color allowing for
         pseudo transparency
 
+   - background-image-reload
+      - allows the background image to be reloaded similar to xresources using USR1 signals
+
    - [blinking-cursor](https://st.suckless.org/patches/blinking_cursor/)
       - allows the use of a blinking cursor
 

patch/background_image_x.c

@@ -94,3 +94,13 @@ bginit()
 		XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
 	}
 }
+
+#if BACKGROUND_IMAGE_RELOAD_PATCH
+void
+reload_image()
+{
+	XFreeGC(xw.dpy, xw.bggc);
+	bginit();
+	redraw();
+}
+#endif // XRESOURCES_RELOAD_PATCH

patch/background_image_x.h

@@ -3,3 +3,4 @@
 static void updatexy(void);
 static XImage *loadff(const char *);
 static void bginit();
+static void reload_image();

patch/xresources.c

@@ -35,22 +35,14 @@ resource_load(XrmDatabase db, char *name, enum resource_type rtype, void *dst)
 }
 
 void
-#if XRESOURCES_RELOAD_PATCH
 config_init(Display *dpy)
-#else
-config_init(void)
-#endif // XRESOURCES_RELOAD_PATCH
 {
 	char *resm;
 	XrmDatabase db;
 	ResourcePref *p;
 
 	XrmInitialize();
-	#if XRESOURCES_RELOAD_PATCH
 	resm = XResourceManagerString(dpy);
-	#else
-	resm = XResourceManagerString(xw.dpy);
-	#endif // XRESOURCES_RELOAD_PATCH
 	if (!resm)
 		return;
 
@@ -69,11 +61,7 @@ reload_config(int sig)
 		die("Can't open display\n");
 
 	config_init(dpy);
-	if (sig != -1) {
-		/* Called due to a SIGUSR1 */
 	xloadcols();
 	redraw();
-	}
-	signal(SIGUSR1, reload_config);
 }
 #endif // XRESOURCES_RELOAD_PATCH

patch/xresources.h

@@ -14,8 +14,4 @@ typedef struct {
 } ResourcePref;
 
 int resource_load(XrmDatabase, char *, enum resource_type, void *);
-#if XRESOURCES_RELOAD_PATCH
 void config_init(Display *dpy);
-#else
-void config_init(void);
-#endif // XRESOURCES_RELOAD_PATCH

patches.def.h

@@ -54,6 +54,12 @@
  */
 #define BACKGROUND_IMAGE_PATCH 0
 
+/* This patch adds the ability to reload the background image config when a SIGUSR1 signal is
+ * received, e.g.: killall -USR1 st
+ * Depends on the BACKGROUND_IMAGE_PATCH.
+ */
+#define BACKGROUND_IMAGE_RELOAD_PATCH 0
+
 /* This patch allows the use of a blinking cursor.
  * Only cursor styles 0, 1, 3, 5, and 7 blink. Set cursorstyle accordingly.
  * Cursor styles are defined here:

x.c

@@ -117,6 +117,9 @@ static void selnotify(XEvent *);
 static void selclear_(XEvent *);
 static void selrequest(XEvent *);
 static void setsel(char *, Time);
+#if XRESOURCES_PATCH && XRESOURCES_RELOAD_PATCH || BACKGROUND_IMAGE_PATCH && BACKGROUND_IMAGE_RELOAD_PATCH
+static void sigusr1_reload(int sig);
+#endif // XRESOURCES_RELOAD_PATCH | BACKGROUND_IMAGE_RELOAD_PATCH
 static int mouseaction(XEvent *, uint);
 static void mousesel(XEvent *, int);
 static void mousereport(XEvent *);
@@ -744,6 +747,20 @@ setsel(char *str, Time t)
 	#endif // CLIPBOARD_PATCH
 }
 
+#if XRESOURCES_PATCH && XRESOURCES_RELOAD_PATCH || BACKGROUND_IMAGE_PATCH && BACKGROUND_IMAGE_RELOAD_PATCH
+void
+sigusr1_reload(int sig)
+{
+	#if XRESOURCES_PATCH && XRESOURCES_RELOAD_PATCH
+	reload_config(sig);
+	#endif // XRESOURCES_RELOAD_PATCH
+	#if BACKGROUND_IMAGE_PATCH && BACKGROUND_IMAGE_RELOAD_PATCH
+	reload_image();
+	#endif // BACKGROUND_IMAGE_RELOAD_PATCH
+	signal(SIGUSR1, sigusr1_reload);
+}
+#endif // XRESOURCES_RELOAD_PATCH | BACKGROUND_IMAGE_RELOAD_PATCH
+
 void
 xsetsel(char *str)
 {
@@ -1360,8 +1377,10 @@ xinit(int cols, int rows)
 	XVisualInfo vis;
 	#endif // ALPHA_PATCH
 
+	#if !XRESOURCES_PATCH
 	if (!(xw.dpy = XOpenDisplay(NULL)))
 		die("can't open display\n");
+	#endif // XRESOURCES_PATCH
 	xw.scr = XDefaultScreen(xw.dpy);
 
 	#if ALPHA_PATCH
@@ -3400,14 +3419,15 @@ run:
 
 	setlocale(LC_CTYPE, "");
 	XSetLocaleModifiers("");
-	#if XRESOURCES_RELOAD_PATCH && XRESOURCES_PATCH
-	reload_config(-1);
-	#elif XRESOURCES_PATCH
+	#if XRESOURCES_PATCH && XRESOURCES_RELOAD_PATCH || BACKGROUND_IMAGE_PATCH && BACKGROUND_IMAGE_RELOAD_PATCH
+	signal(SIGUSR1, sigusr1_reload);
+	#endif // XRESOURCES_RELOAD_PATCH | BACKGROUND_IMAGE_RELOAD_PATCH
+	#if XRESOURCES_PATCH
 	if (!(xw.dpy = XOpenDisplay(NULL)))
 		die("Can't open display\n");
 
-	config_init();
-	#endif // XRESOURCES_RELOAD_PATCH
+	config_init(xw.dpy);
+	#endif // XRESOURCES_PATCH
 	cols = MAX(cols, 1);
 	rows = MAX(rows, 1);
 	#if ALPHA_PATCH && ALPHA_FOCUS_HIGHLIGHT_PATCH