Keep depth positive when calculating mathtext bounding box

mdboom · mdboom · commit 222021b0de0a · 2015-02-23T16:40:00.000-05:00
diff --git a/lib/matplotlib/mathtext.py b/lib/matplotlib/mathtext.py
@@ -178,7 +178,7 @@ def _update_bbox(self, x1, y1, x2, y2):
     def set_canvas_size(self, w, h, d):
         MathtextBackend.set_canvas_size(self, w, h, d)
         if self.mode != 'bbox':
-            self.image = FT2Image(ceil(w), ceil(h + d))
+            self.image = FT2Image(ceil(w), ceil(h + max(d, 0)))
 
     def render_glyph(self, ox, oy, info):
         if self.mode == 'bbox':
