Only re-render swaybar when it has changed

Fixes #345

1 files changed, 5 insertions, 2 deletions

diff --git a/swaybar/main.c b/swaybar/main.c
index 65d2a493..60687bc5 100644
--- a/swaybar/main.c
+++ b/swaybar/main.c
@@ -51,6 +51,7 @@ FILE *command;
 char *line, *output, *status_command;
 struct registry *registry;
 struct window *window;
+bool dirty = true;
 
 struct colors colors = {
         .background = 0x000000FF,
@@ -278,6 +279,7 @@ void update() {
                         if (line[l] == '\n') {
                                 line[l] = '\0';
                         }
+                        dirty = true;
                 }
         }
         if (ioctl(socketfd, FIONREAD, &pending) != -1 && pending > 0) {
@@ -285,6 +287,7 @@ void update() {
                 char *buf = ipc_recv_response(socketfd, &len);
                 free(buf);
                 ipc_update_workspaces();
+                dirty = true;
         }
 }
 
@@ -425,8 +428,8 @@ int main(int argc, char **argv) {
         window->height = height + MARGIN * 2;
 
         do {
-                if (window_prerender(window) && window->cairo) {
-                        update();
+                update();
+                if (dirty && window_prerender(window) && window->cairo) {
                         render();
                         window_render(window);
                 }