From 0706a36ef8ff06370ebcfacb45e7f943147ad304 Mon Sep 17 00:00:00 2001
From: Antoine Lambert <antoine.lambert33@gmail.com>
Date: Thu, 23 Nov 2023 01:21:02 +0100
Subject: [PATCH] talipot-gui/GlWidget: Fix segfault when not embeded in a
 graphics item

---
 library/talipot-gui/include/talipot/GlWidget.h | 6 +++++-
 library/talipot-gui/src/GlWidget.cpp           | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/library/talipot-gui/include/talipot/GlWidget.h b/library/talipot-gui/include/talipot/GlWidget.h
index 93bd69f90a..4689354d80 100644
--- a/library/talipot-gui/include/talipot/GlWidget.h
+++ b/library/talipot-gui/include/talipot/GlWidget.h
@@ -286,7 +286,11 @@ class TLP_QT_SCOPE GlWidget : public QOpenGLWidget {
   // devicePixelRatio() must be overridden because the inherited QWidget
   // method always returns 1 when the widget is no attached to a window
   qreal devicePixelRatio() const {
-    return _windows->devicePixelRatio();
+    if (_windows) {
+      return _windows->devicePixelRatio();
+    } else {
+      return QOpenGLWidget::devicePixelRatio();
+    }
   }
 
 private:
diff --git a/library/talipot-gui/src/GlWidget.cpp b/library/talipot-gui/src/GlWidget.cpp
index ec10d31d31..22d1395e1d 100644
--- a/library/talipot-gui/src/GlWidget.cpp
+++ b/library/talipot-gui/src/GlWidget.cpp
@@ -69,7 +69,7 @@ GlWidget::GlWidget(QWidget *parent, View *view)
   // windows attached to it, making device pixel ratio value unreliable so we
   // grab a pointer to the adequate main window to override the implementation
   // of the devicePixelRatio method
-  _windows = window()->windowHandle() ? window() : getMainWindow();
+  _windows = window()->windowHandle() ? nullptr : getMainWindow();
 }
 //==================================================
 GlWidget::~GlWidget() {