From 057fe1752477bdaafd2c9ec15f88b750083aff38 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Sun, 20 Dec 2015 18:04:33 +0100
Subject: gui: don't update main window if we're minimized

Shaves off 12% runtime in minimized case.
---
 gui/ui.cpp | 26 ++++++++++++++++++++++----
 gui/ui.h   |  3 +++
 2 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/gui/ui.cpp b/gui/ui.cpp
index c19e4840..31bce40b 100644
--- a/gui/ui.cpp
+++ b/gui/ui.cpp
@@ -122,6 +122,8 @@ MainWindow::MainWindow() :
     
     register_shortcuts();
     
+    connect(this, &MainWindow::emit_minimized, this, &MainWindow::mark_minimized, Qt::QueuedConnection);
+    
     ui.btnStartTracker->setFocus();
 }
 
@@ -419,6 +421,9 @@ void MainWindow::set_title(const QString& game_title_)
 
 void MainWindow::showHeadPose()
 {
+    if (!ui.video_frame->isEnabled())
+        return;
+
     double mapped[6], raw[6];
 
     work->tracker->get_raw_and_mapped_poses(mapped, raw);
@@ -548,15 +553,28 @@ void MainWindow::restore_from_tray(QSystemTrayIcon::ActivationReason)
 
 void MainWindow::changeEvent(QEvent* e)
 {
-    if (s.tray_enabled && e->type() == QEvent::WindowStateChange && (windowState() & Qt::WindowMinimized))
+    if (e->type() == QEvent::WindowStateChange)
     {
-        if (!tray)
-            ensure_tray();
-        hide();
+        const bool is_minimized = windowState() & Qt::WindowMinimized;
+        
+        if (s.tray_enabled && is_minimized)
+        {
+            if (!tray)
+                ensure_tray();
+            hide();
+        }
+        
+        emit_minimized(is_minimized);
     }
+    
     QMainWindow::changeEvent(e);
 }
 
+void MainWindow::mark_minimized(bool is_minimized)
+{
+    ui.video_frame->setEnabled(!is_minimized);
+}
+
 void MainWindow::maybe_start_profile_from_executable()
 {
     if (!work)
diff --git a/gui/ui.h b/gui/ui.h
index deeb116d..6dbcf962 100644
--- a/gui/ui.h
+++ b/gui/ui.h
@@ -106,10 +106,13 @@ private slots:
     void startTracker();
     void stopTracker();
     void reload_options();
+    void mark_minimized(bool is_minimized);
 signals:
     void emit_start_tracker();
     void emit_stop_tracker();
     void emit_toggle_tracker();
+    
+    void emit_minimized(bool);
 public:
     MainWindow();
     ~MainWindow();
-- 
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