FIX: implement get_rgb for GraphicsContextCairo

tacaswell · tacaswell · commit 8c5a6e03f224 · 2015-06-19T15:43:23.000-04:00
Was falling back to the base implementation of get_rgb which looks at a local variable which was getting out of sync with the stack. Now consults the underlying cairo context. Closes #4024 for cairo based backends
diff --git a/lib/matplotlib/backends/backend_cairo.py b/lib/matplotlib/backends/backend_cairo.py
@@ -397,6 +397,8 @@ def set_graylevel(self, frac):
         else:
             self.ctx.set_source_rgba(*self._rgb)
 
+    def get_rgb(self):
+        return self.ctx.get_source().get_rgba()[:3]
 
     def set_joinstyle(self, js):
         if js in ('miter', 'round', 'bevel'):
