Merge pull request matplotlib#4113 from fcolas/fix#3330

MNT : normalize font weights in OSX

Author: tacaswell

lib/matplotlib/backends/backend_macosx.py

@@ -138,6 +138,11 @@ def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
         else:
             family =  prop.get_family()
             weight = prop.get_weight()
+            # transform weight into string for the native backend
+            if weight >= 700:
+                weight = 'bold'
+            else:
+                weight = 'normal'
             style = prop.get_style()
             points = prop.get_size_in_points()
             size = self.points_to_pixels(points)
@@ -157,6 +162,11 @@ def get_text_width_height_descent(self, s, prop, ismath):
             return width, height, descent
         family =  prop.get_family()
         weight = prop.get_weight()
+        # transform weight into string for the native backend
+        if weight >= 700:
+            weight = 'bold'
+        else:
+            weight = 'normal'
         style = prop.get_style()
         points = prop.get_size_in_points()
         size = self.points_to_pixels(points)

lib/matplotlib/font_manager.py

@@ -867,6 +867,7 @@ def set_weight(self, weight):
         except ValueError:
             if weight not in weight_dict:
                 raise ValueError("weight is invalid")
+            weight = weight_dict[weight]
         self._weight = weight
 
     def set_stretch(self, stretch):