From 89228b069741094d895d951c690fd0a6e893cd12 Mon Sep 17 00:00:00 2001
From: Rafael Kitover <rkitover@gmail.com>
Date: Mon, 18 Jun 2018 10:11:14 -0700
Subject: [PATCH] fix high CPU usage under wxgtk2 #260

When using GTK2, call DrawArea(dc) instead of GetWindow()->Refresh(),
this prevents glib from using huge amounts of CPU (as discovered by
@retro-wertz .)

Switching video drivers sometimes crashes the app, the DrawArea() call
is as safe as possible, the problem is elsewhere.
---
 src/wx/panel.cpp | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/wx/panel.cpp b/src/wx/panel.cpp
index 9ce0b2f9..29cd9c28 100644
--- a/src/wx/panel.cpp
+++ b/src/wx/panel.cpp
@@ -1816,8 +1816,20 @@ void DrawingPanelBase::DrawArea(uint8_t** data)
         }
     }
 
-    // next, draw the frame (queue a PaintEv)
+    // next, draw the frame (queue a PaintEv) Refresh must be used under
+    // Wayland or nothing is drawn, however it causes high CPU usage with GTK2,
+    // so use the old method in that case
+#ifdef __WXGTK3__
     GetWindow()->Refresh();
+#else
+    {
+        DrawingPanelBase* panel = wxGetApp().frame->GetPanel()->panel;
+        if (panel) {
+            wxClientDC dc(panel->GetWindow());
+            panel->DrawArea(dc);
+        }
+    }
+#endif
 
     // finally, draw on-screen text using wx method, if possible
     // this method flickers too much right now