core: remove various leftovers

src/config.h

@@ -28,15 +28,6 @@
 
 typedef struct session session_t;
 
-/// @brief Possible backends
-enum backend {
-	BKEND_XRENDER,
-	BKEND_GLX,
-	BKEND_DUMMY,
-	BKEND_EGL,
-	NUM_BKEND,
-};
-
 typedef struct win_option_mask {
 	bool shadow : 1;
 	bool fade : 1;
@@ -435,8 +426,6 @@ typedef struct options {
 	bool has_both_style_of_rules;
 } options_t;
 
-extern const char *const BACKEND_STRS[NUM_BKEND + 1];
-
 bool load_plugin(const char *name, const char *include_dir);
 static inline void record_problematic_option(struct options *opt, const char *name) {
 	struct option_name *record = calloc(1, sizeof(*record));
@@ -488,18 +477,6 @@ bool parse_config_libconfig(options_t *, const char *config_file);
 ///   same as parse_config_libconfig
 bool parse_config(options_t *, const char *config_file);
 
-/**
- * Parse a backend option argument.
- */
-static inline attr_pure int parse_backend(const char *str) {
-	for (int i = 0; BACKEND_STRS[i]; ++i) {
-		if (strcasecmp(str, BACKEND_STRS[i]) == 0) {
-			return i;
-		}
-	}
-	return NUM_BKEND;
-}
-
 /**
  * Parse a VSync option argument.
  */

src/picom.c

@@ -104,15 +104,6 @@ const struct wintype_info WINTYPES[] = {
 #undef X
 };
 
-// clang-format off
-/// Names of backends.
-const char *const BACKEND_STRS[] = {[BKEND_XRENDER] = "xrender",
-                                    [BKEND_GLX] = "glx",
-                                    [BKEND_DUMMY] = "dummy",
-                                    [BKEND_EGL] = "egl",
-                                    NULL};
-// clang-format on
-
 // === Global variables ===
 
 /// Pointer to current session, as a global variable. Only used by
@@ -1203,8 +1194,8 @@ static bool redirect_start(session_t *ps) {
 
 	ps->frame_pacing = ps->o.frame_pacing && ps->o.vsync;
 	if ((ps->o.benchmark || !ps->backend_data->ops.last_render_time) && ps->frame_pacing) {
-		// Disable frame pacing if we are using a legacy backend or if we are in
-		// benchmark mode, or if the backend doesn't report render time
+		// Disable frame pacing if we are in benchmark mode or if the backend
+		// doesn't report render time.
 		log_info("Disabling frame pacing.");
 		ps->frame_pacing = false;
 	}

src/x.h

@@ -243,15 +243,6 @@ x_get_prop(const struct x_connection *c, xcb_window_t wid, xcb_atom_t atom, int
 /// Get the type, format and size in bytes of a window's specific attribute.
 winprop_info_t x_get_prop_info(const struct x_connection *c, xcb_window_t w, xcb_atom_t atom);
 
-/// Discard all X events in queue or in flight. Should only be used when the server is
-/// grabbed
-static inline void x_discard_events(struct x_connection *c) {
-	xcb_generic_event_t *e;
-	while ((e = xcb_poll_for_event(c->c))) {
-		free(e);
-	}
-}
-
 /**
  * Get the value of a type-<code>xcb_window_t</code> property of a window.
  *