Merge pull request #12017 from meeseeksmachine/auto-backport-of-pr-12016-on-v3.0.x

dstansby · web-flow · commit 56ee1b2f1570 · 2018-09-05T09:24:21.000+01:00
Backport PR #12016 on branch v3.0.x (Fix AttributeError in GTK3Agg backend)
diff --git a/lib/matplotlib/backends/backend_gtk3agg.py b/lib/matplotlib/backends/backend_gtk3agg.py
@@ -2,6 +2,7 @@
 
 import numpy as np
 
+from .. import cbook
 from . import backend_agg, backend_cairo, backend_gtk3
 from ._gtk3_compat import gi
 from .backend_cairo import cairo
@@ -45,7 +46,7 @@ def on_draw_event(self, widget, ctx):
             width = int(bbox.x1) - int(bbox.x0)
             height = int(bbox.y1) - int(bbox.y0)
 
-            buf = backend_cairo._unmultipled_rgba8888_to_premultiplied_argb32(
+            buf = cbook._unmultipled_rgba8888_to_premultiplied_argb32(
                 np.asarray(self.copy_from_bbox(bbox)))
             image = cairo.ImageSurface.create_for_data(
                 buf.ravel().data, cairo.FORMAT_ARGB32, width, height)
