Handle alpha on images in Cairo backend.

mdboom · mdboom · commit 87bdb63cd750 · 2014-01-27T13:30:50.000-05:00
diff --git a/lib/matplotlib/backends/backend_cairo.py b/lib/matplotlib/backends/backend_cairo.py
@@ -177,7 +177,10 @@ def draw_image(self, gc, x, y, im):
 
         ctx.save()
         ctx.set_source_surface (surface, x, y)
-        ctx.paint()
+        if gc.get_alpha() != 1.0:
+            ctx.paint_with_alpha(gc.get_alpha())
+        else:
+            ctx.paint()
         ctx.restore()
 
         im.flipud_out()
