work around cairo context exceptions

1 files changed, 7 insertions, 1 deletions

diff --git a/voctogui/lib/warningoverlay.py b/voctogui/lib/warningoverlay.py
index 6df932e..3cbe13c 100644
--- a/voctogui/lib/warningoverlay.py
+++ b/voctogui/lib/warningoverlay.py
@@ -1,5 +1,5 @@
 import logging
-from gi.repository import GLib, Gst
+from gi.repository import GLib, Gst, cairo
 
 from lib.config import Config
 
@@ -46,6 +46,12 @@ class VideoWarningOverlay(object):
 		w = self.width
 		h = self.height / 20
 
+		# during startup, cr is sometimes another kind of context,
+		# which does not expose set_source_rgba and other methods.
+		# this check avoids the exceptions that would be thrown then.
+		if isinstance(cr, cairo.Context):
+			return
+
 		if self.blink_state:
 			cr.set_source_rgba(1.0, 0.0, 0.0, 0.8)
 		else: