feat: Calculate animation curve by time points rather than passed frames

src/common/util.c

@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 
 #include "util.h"
 
@@ -80,3 +81,15 @@ int regex_match(const char *pattern, const char *str) {
 void wl_list_append(struct wl_list *list, struct wl_list *object) {
 	wl_list_insert(list->prev, object);
 }
+
+unsigned int get_now_in_ms(void) {
+	struct timespec now;
+	clock_gettime(CLOCK_MONOTONIC, &now);
+
+	return timespec_to_ms(&now);
+}
+
+unsigned int timespec_to_ms(struct timespec *ts) {
+	return (unsigned int)ts->tv_sec * 1000 +
+		   (unsigned int)ts->tv_nsec / 1000000;
+}