# HG changeset patch
# User Pantxo Diribarne <pantxo.diribarne@gmail.com>
# Date 1522400731 -7200
# Node ID 6bc4958b224b91b8b2eca370fd499f66d492df00
# Parent  6c1611e6830f78960f377434d24f4039c3a8d744
If getframe fails, retry twice after increasing delays (bug #53328).

* ObjectProxy.cc (ObjectProxy::get_pixels): if QMetaObject::invokeMethod fails,
  retry twice after increasing delay.

diff -r 6c1611e6830f -r 6bc4958b224b libgui/graphics/ObjectProxy.cc
--- a/libgui/graphics/ObjectProxy.cc	Fri Mar 30 10:03:06 2018 -0700
+++ b/libgui/graphics/ObjectProxy.cc	Fri Mar 30 11:05:31 2018 +0200
@@ -129,7 +129,23 @@
     QMetaObject::invokeMethod (m_object, "slotGetPixels", t,
                                Q_RETURN_ARG (uint8NDArray, retval));
 
-    return retval;
-  }
+    // FIXME: The following may fail for obscure reasons, see bug #53328.
+    //        In absence of a solution, we retry twice before calling error().
+    if (! QMetaObject::invokeMethod (m_object, "slotGetPixels", t,
+                                     Q_RETURN_ARG (uint8NDArray, retval)))
+      {
+        QThread::msleep (100);
+        if (! QMetaObject::invokeMethod (m_object, "slotGetPixels", t,
+                                         Q_RETURN_ARG (uint8NDArray, retval)))
+          {
+            QThread::msleep (200);
+            if (! QMetaObject::invokeMethod (m_object, "slotGetPixels", t,
+                                             Q_RETURN_ARG (uint8NDArray, retval)))
+              error ("getframe: unable to retrieve figure pixels");
+          }
+      }
+    
+     return retval;
+   }
 
 };