Support returning physical size of the canvas.

QuLogic · QuLogic · commit f9ec6f8f0f96 · 2021-04-14T17:02:09.000-04:00
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
@@ -2107,21 +2107,28 @@ def _set_device_pixel_ratio(self, ratio):
         self._device_pixel_ratio = ratio
         return True
 
-    def get_width_height(self):
+    def get_width_height(self, *, physical=False):
         """
         Return the figure width and height in integral points or pixels.
 
         When the figure is used on High DPI screens (and the backend supports
         it), the truncation to integers occurs after scaling by the device
         pixel ratio.
 
+        Parameters
+        ----------
+        physical : bool, default: False
+            Whether to return true physical pixels or logical pixels. Physical
+            pixels may be used by backends that support HiDPI, but still
+            configure the canvas using its actual size.
+
         Returns
         -------
         width, height : int
             The size of the figure, in points or pixels, depending on the
             backend.
         """
-        return tuple(int(size / self.device_pixel_ratio)
+        return tuple(int(size / (1 if physical else self.device_pixel_ratio))
                      for size in self.figure.bbox.max)
 
     @classmethod
