Better subpixel positioning?

anntzer · anntzer · commit 5bcd22e2b754 · 2019-09-25T02:22:25.000+02:00
diff --git a/lib/matplotlib/mathtext.py b/lib/matplotlib/mathtext.py
@@ -190,21 +190,23 @@ def get_results(self, box, used_characters):
         orig_height = box.height
         orig_depth = box.depth
         ship(0, 0, box)
-        xmin = self._xmin - 1
-        xmax = self._xmax + 1
-        ymin = self._ymin - 1
-        ymax = self._ymax + 1
-        image = FT2Image(np.ceil(xmax - xmin), np.ceil(ymax - ymin))
+        xmin = np.floor(self._xmin)
+        xmax = np.ceil(self._xmax)
+        ymin = np.floor(self._ymin)
+        ymax = np.ceil(self._ymax)
+        dxmin = self._xmin - xmin
+        dymin = self._ymin - ymin
+        image = FT2Image(np.ceil(xmax - xmin) + 1, np.ceil(ymax - ymin) + 1)
 
         for ox, oy, info in self._glyphs:
             info.font.draw_glyph_to_bitmap(
-                image, ox + 1, oy - info.metrics.iceberg + 1,
+                image, ox + dxmin, oy - info.metrics.iceberg + dymin,
                 info.glyph, antialiased=rcParams['text.antialiased'])
         for x1, y1, x2, y2 in self._rects:
-            x1 += 1
-            x2 += 1
-            y1 += 1
-            y2 += 1
+            x1 += dxmin
+            x2 += dymin
+            y1 += dxmin
+            y2 += dymin
             height = max(int(y2 - y1) - 1, 0)
             if height == 0:
                 center = (y2 + y1) / 2
