Greatly reduce redundant window refreshing

This should substantially reduce CPU usage and possibly fix some
issues with interface jittering/flashing

src/chat.c

@@ -1072,13 +1072,12 @@ static void draw_infobox(ToxWindow *self)
 
     time_t curtime = get_unix_time();
 
-    /* update elapsed time string once per second */
-    if (curtime > infobox->lastupdate) {
+    /* update interface once per second */
+    if (timed_out(infobox->lastupdate, 1)) {
         get_elapsed_time_str(infobox->timestr, sizeof(infobox->timestr), curtime - infobox->starttime);
+        infobox->lastupdate = curtime;
     }
 
-    infobox->lastupdate = curtime;
-
     const char *in_is_muted = infobox->in_is_muted ? "yes" : "no";
     const char *out_is_muted = infobox->out_is_muted ? "yes" : "no";
 
@@ -1443,7 +1442,11 @@ static void chat_onDraw(ToxWindow *self, Tox *m)
     }
 
     pthread_mutex_lock(&Winthread.lock);
-    refresh_file_transfer_progress(self, self->num);
+
+    if (refresh_file_transfer_progress(self, self->num)) {
+        flag_interface_refresh();
+    }
+
     pthread_mutex_unlock(&Winthread.lock);
 }
 

src/file_transfers.c

@@ -117,13 +117,27 @@ static void refresh_progress_helper(ToxWindow *self, struct FileTransfer *ft)
     ft->last_line_progress = get_unix_time();
 }
 
-/* refreshes active file transfer status bars. */
-void refresh_file_transfer_progress(ToxWindow *self, uint32_t friendnumber)
+/* refreshes active file transfer status bars.
+ *
+ * Return true if there is at least one active file transfer in either direction.
+ */
+bool refresh_file_transfer_progress(ToxWindow *self, uint32_t friendnumber)
 {
+    bool active = false;
+
     for (size_t i = 0; i < MAX_FILES; ++i) {
-        refresh_progress_helper(self, &Friends.list[friendnumber].file_receiver[i]);
-        refresh_progress_helper(self, &Friends.list[friendnumber].file_sender[i]);
+        struct FileTransfer *ft_r = &Friends.list[friendnumber].file_receiver[i];
+        struct FileTransfer *ft_s = &Friends.list[friendnumber].file_sender[i];
+
+        refresh_progress_helper(self, ft_r);
+        refresh_progress_helper(self, ft_s);
+
+        if (ft_r->state !=  FILE_TRANSFER_INACTIVE || ft_s->state != FILE_TRANSFER_INACTIVE) {
+            active = true;
+        }
     }
+
+    return active;
 }
 
 static void clear_file_transfer(struct FileTransfer *ft)

src/file_transfers.h

@@ -72,8 +72,11 @@ void init_progress_bar(char *progline);
 /* prints a progress bar for file transfers */
 void print_progress_bar(ToxWindow *self, double pct_done, double bps, uint32_t line_id);
 
-/* refreshes active file transfer status bars. */
-void refresh_file_transfer_progress(ToxWindow *self, uint32_t friendnumber);
+/* refreshes active file transfer status bars.
+ *
+ * Return true if there is at least one active file transfer in either direction.
+ */
+bool refresh_file_transfer_progress(ToxWindow *self, uint32_t friendnumber);
 
 /* Returns a pointer to friendnumber's FileTransfer struct associated with filenumber.
  * Returns NULL if filenumber is invalid.

src/input.c

@@ -346,5 +346,9 @@ bool input_handle(ToxWindow *self, wint_t key, int x, int mx_x)
         }
     }
 
+    if (match) {
+        flag_interface_refresh();
+    }
+
     return match;
 }

src/line_info.c

@@ -444,6 +444,8 @@ int line_info_add(ToxWindow *self, bool show_timestamp, const char *name1, const
 
     hst->queue[hst->queue_size++] = new_line;
 
+    flag_interface_refresh();
+
     return new_line->id;
 }
 
@@ -469,6 +471,8 @@ static void line_info_check_queue(ToxWindow *self)
     if (!self->scroll_pause) {
         line_info_reset_start(self, hst);
     }
+
+    flag_interface_refresh();
 }
 
 #define NOREAD_FLAG_TIMEOUT 5    /* seconds before a sent message with no read receipt is flagged as unread */
@@ -750,6 +754,8 @@ static bool line_info_screen_fit(ToxWindow *self, struct line_info *line)
 /* puts msg in specified line_info msg buffer */
 void line_info_set(ToxWindow *self, uint32_t id, char *msg)
 {
+    flag_interface_refresh();
+
     struct line_info *line = self->chatwin->hst->line_end;
 
     while (line) {
@@ -855,6 +861,10 @@ bool line_info_onKey(ToxWindow *self, wint_t key)
         match = false;
     }
 
+    if (match) {
+        flag_interface_refresh();
+    }
+
     return match;
 }
 

src/prompt.c

@@ -125,6 +125,8 @@ void on_self_connection_status(Tox *m, Tox_Connection connection_status, void *u
     UNUSED_VAR(userdata);
     StatusBar *statusbar = prompt->stb;
     statusbar->connection = connection_status;
+
+    flag_interface_refresh();
 }
 
 /* Updates own nick in prompt statusbar */

src/toxic.c

@@ -1072,6 +1072,37 @@ static void do_toxic(Tox *m)
     pthread_mutex_unlock(&Winthread.lock);
 }
 
+/* Set interface refresh flag. This should be called whenever the interface changes.
+ *
+ * This function is not thread safe.
+ */
+void flag_interface_refresh(void)
+{
+    Winthread.flag_refresh = 1;
+    Winthread.last_refresh_flag = get_unix_time();
+}
+
+/* How long we wait to idle interface refreshing after last flag set. Should be no less than 2. */
+#define ACTIVE_WIN_REFRESH_TIMEOUT 2
+
+static void poll_interface_refresh_flag(void)
+{
+    pthread_mutex_lock(&Winthread.lock);
+
+    bool flag = Winthread.flag_refresh;
+    time_t t = Winthread.last_refresh_flag;
+
+    pthread_mutex_unlock(&Winthread.lock);
+
+    if (flag == 1 && timed_out(t, ACTIVE_WIN_REFRESH_TIMEOUT)) {
+        pthread_mutex_lock(&Winthread.lock);
+        Winthread.flag_refresh = 0;
+        pthread_mutex_unlock(&Winthread.lock);
+    }
+}
+
+
+/* How often we refresh windows that aren't focused */
 #define INACTIVE_WIN_REFRESH_RATE 10
 
 void *thread_winref(void *data)
@@ -1079,11 +1110,12 @@ void *thread_winref(void *data)
     Tox *m = (Tox *) data;
 
     uint8_t draw_count = 0;
+
     init_signal_catchers();
 
     while (true) {
-        draw_active_window(m);
         draw_count++;
+        draw_active_window(m);
 
         if (Winthread.flag_resize) {
             on_window_resize();
@@ -1097,6 +1129,8 @@ void *thread_winref(void *data)
             pthread_mutex_lock(&Winthread.lock);
             exit_toxic_success(m);
         }
+
+        poll_interface_refresh_flag();
     }
 }
 

src/toxic.h

@@ -102,6 +102,8 @@ typedef enum _FATAL_ERRS {
 void lock_status(void);
 void unlock_status(void);
 
+void flag_interface_refresh(void);
+
 void exit_toxic_success(Tox *m);
 void exit_toxic_err(const char *errmsg, int errcode);
 

src/windows.c

@@ -77,6 +77,8 @@ void on_friend_connection_status(Tox *m, uint32_t friendnumber, Tox_Connection c
             windows[i]->onConnectionChange(windows[i], m, friendnumber, connection_status);
         }
     }
+
+    flag_interface_refresh();
 }
 
 void on_friend_typing(Tox *m, uint32_t friendnumber, bool is_typing, void *userdata)
@@ -92,6 +94,8 @@ void on_friend_typing(Tox *m, uint32_t friendnumber, bool is_typing, void *userd
             windows[i]->onTypingChange(windows[i], m, friendnumber, is_typing);
         }
     }
+
+    flag_interface_refresh();
 }
 
 void on_friend_message(Tox *m, uint32_t friendnumber, Tox_Message_Type type, const uint8_t *string, size_t length,
@@ -123,6 +127,8 @@ void on_friend_name(Tox *m, uint32_t friendnumber, const uint8_t *string, size_t
         }
     }
 
+    flag_interface_refresh();
+
     store_data(m, DATA_FILE);
 }
 
@@ -140,6 +146,8 @@ void on_friend_status_message(Tox *m, uint32_t friendnumber, const uint8_t *stri
             windows[i]->onStatusMessageChange(windows[i], friendnumber, msg, length);
         }
     }
+
+    flag_interface_refresh();
 }
 
 void on_friend_status(Tox *m, uint32_t friendnumber, Tox_User_Status status, void *userdata)
@@ -151,6 +159,8 @@ void on_friend_status(Tox *m, uint32_t friendnumber, Tox_User_Status status, voi
             windows[i]->onStatusChange(windows[i], m, friendnumber, status);
         }
     }
+
+    flag_interface_refresh();
 }
 
 void on_friend_added(Tox *m, uint32_t friendnumber, bool sort)
@@ -200,6 +210,8 @@ void on_conference_peer_list_changed(Tox *m, uint32_t conferencenumber, void *us
             windows[i]->onConferenceNameListChange(windows[i], m, conferencenumber);
         }
     }
+
+    flag_interface_refresh();
 }
 
 void on_conference_peer_name(Tox *m, uint32_t conferencenumber, uint32_t peernumber, const uint8_t *name,
@@ -423,11 +435,13 @@ void set_active_window_index(uint8_t index)
  */
 void set_next_window(int ch)
 {
+    uint8_t index = 0;
+
     if (ch == user_settings->key_next_tab) {
         for (uint8_t i = active_window_index + 1; i < MAX_WINDOWS_NUM; ++i) {
             if (windows[i] != NULL) {
-                set_active_window_index(i);
-                return;
+                index = i;
+                break;
             }
         }
     } else {
@@ -435,13 +449,15 @@ void set_next_window(int ch)
 
         for (uint8_t i = start; i > 0; --i) {
             if (windows[i] != NULL) {
-                set_active_window_index(i);
-                return;
+                index = i;
+                break;
             }
         }
     }
 
-    set_active_window_index(0);
+    set_active_window_index(index);
+
+    flag_interface_refresh();
 }
 
 /* Deletes window w and cleans up */
@@ -784,21 +800,40 @@ void draw_active_window(Tox *m)
     pthread_mutex_lock(&Winthread.lock);
     a->alert = WINDOW_ALERT_NONE;
     a->pending_messages = 0;
+    bool flag_refresh = Winthread.flag_refresh;
     pthread_mutex_unlock(&Winthread.lock);
 
-    touchwin(a->window);
-    a->onDraw(a, m);
-    wrefresh(a->window);
+    if (flag_refresh) {
+        touchwin(a->window);
+        a->onDraw(a, m);
+        wrefresh(a->window);
+    }
+#ifdef AUDIO
+    else if (a->is_call && timed_out(a->chatwin->infobox.lastupdate, 1)) {
+        touchwin(a->window);
+        a->onDraw(a, m);
+        wrefresh(a->window);
+    }
+#endif
 
 #ifdef GAMES
-
     if (a->type == WINDOW_TYPE_GAME) {
+        if (!flag_refresh) {  // we always want to be continously refreshing game windows
+            touchwin(a->window);
+            a->onDraw(a, m);
+            wrefresh(a->window);
+        }
+
         int ch = getch();
 
         if (ch == ERR) {
             return;
         }
 
+        pthread_mutex_lock(&Winthread.lock);
+        flag_interface_refresh();
+        pthread_mutex_unlock(&Winthread.lock);
+
         if (ch == user_settings->key_next_tab || ch == user_settings->key_prev_tab) {
             set_next_window(ch);
         }
@@ -817,6 +852,10 @@ void draw_active_window(Tox *m)
         return;
     }
 
+    pthread_mutex_lock(&Winthread.lock);
+    flag_interface_refresh();
+    pthread_mutex_unlock(&Winthread.lock);
+
     if (printable == 0 && (ch == user_settings->key_next_tab || ch == user_settings->key_prev_tab)) {
         set_next_window((int) ch);
         return;

src/windows.h

@@ -103,6 +103,8 @@ struct Winthread {
     pthread_mutex_t lock;
     volatile sig_atomic_t sig_exit_toxic;
     volatile sig_atomic_t flag_resize;
+    volatile sig_atomic_t flag_refresh;
+    volatile sig_atomic_t last_refresh_flag;
 };
 
 struct cqueue_thread {