Backport PR #17261: avoid calling wx.Bitmap() if width or height is zero

QuLogic · meeseeksmachine · commit 2046cde36058 · 2020-04-30T01:14:44.000Z
diff --git a/lib/matplotlib/backends/backend_wx.py b/lib/matplotlib/backends/backend_wx.py
@@ -776,14 +776,14 @@ def _onSize(self, evt):
                 # no change in size
                 return
         self._width, self._height = size
-        # Create a new, correctly sized bitmap
-        self.bitmap = wx.Bitmap(self._width, self._height)
-
         self._isDrawn = False
 
         if self._width <= 1 or self._height <= 1:
             return  # Empty figure
 
+        # Create a new, correctly sized bitmap
+        self.bitmap = wx.Bitmap(self._width, self._height)
+
         dpival = self.figure.dpi
         winch = self._width / dpival
         hinch = self._height / dpival
