Rewrite the code that throttles UI updates to be in ui_print itself.

Change-Id: I4fc59efc42991bdcf4fcd09feacfeb6fd984d58c

common.h

@@ -38,6 +38,8 @@ void ui_printlogtail(int nb_lines);
 
 void ui_reset_text_col();
 void ui_set_show_text(int value);
+void ui_set_nice(int enabled);
+#define ui_nice_print(...) ui_set_nice(1); ui_print(__VA_ARGS__); ui_set_nice(0)
 
 // Display some header text followed by a menu of items, which appears
 // at the top of the screen (in place of any scrolling ui_print()

nandroid.c

@@ -75,7 +75,7 @@ static void yaffs_callback(const char* filename)
     if (tmp[strlen(tmp) - 1] == '\n')
         tmp[strlen(tmp) - 1] = NULL;
     if (strlen(tmp) < 30)
-        ui_print("%s", tmp);
+        ui_nice_print("%s", tmp);
     yaffs_files_count++;
     if (yaffs_files_total != 0)
         ui_set_progress((float)yaffs_files_count / (float)yaffs_files_total);

ui.c

@@ -835,6 +835,18 @@ void ui_reset_progress()
     pthread_mutex_unlock(&gUpdateMutex);
 }
 
+static long delta_milliseconds(struct timeval from, struct timeval to) {
+    long delta_sec = (to.tv_sec - from.tv_sec)*1000;
+    long delta_usec = (to.tv_usec - from.tv_usec)/1000;
+    return (delta_sec + delta_usec);
+}
+
+static struct timeval lastupdate = (struct timeval) {0};
+static int ui_nice = 0;
+void ui_set_nice(int enabled) {
+    ui_nice = enabled;
+}
+
 void ui_print(const char *fmt, ...)
 {
     char buf[256];
@@ -846,6 +858,16 @@ void ui_print(const char *fmt, ...)
     if (ui_log_stdout)
         fputs(buf, stdout);
 
+    // if we are running 'ui nice' mode, we do not want to force a screen update
+    // for this line if not necessary.
+    if (ui_nice) {
+        struct timeval curtime;
+        gettimeofday(&curtime, NULL);
+        if (delta_milliseconds(lastupdate, curtime) > 1000)
+            return;
+        lastupdate = curtime;
+    }
+
     // This can get called before ui_init(), so be careful.
     pthread_mutex_lock(&gUpdateMutex);
     if (text_rows > 0 && text_cols > 0) {