Divide by zero and speed up bug fixes

[hackapet/Adafruit_Blinka_Displayio.git] / displayio / display.py

diff --git a/displayio/display.py b/displayio/display.py
index 84cdc25ee985d0c51755db33d06b32687024527f..b9f86dc0bf8b1b6c5d5bc2ab33867d1c00f5e86a 100644 (file)
--- a/displayio/display.py
+++ b/displayio/display.py
@@ -213,6 +213,8 @@ class Display:
         When auto refresh is on, updates the display immediately. (The display will also
         update without calls to this.)
         """
+        self._subrectangles = []
+
         # Go through groups and and add each to buffer
         if self._current_group is not None:
             buffer = Image.new("RGBA", (self._width, self._height))
@@ -221,8 +223,9 @@ class Display:
             # save image to buffer (or probably refresh buffer so we can compare)
             self._buffer.paste(buffer)
 
-        # Eventually calculate dirty rectangles here
-        self._subrectangles.append(Rectangle(0, 0, self._width, self._height))
+        if self._current_group is not None:
+            # Eventually calculate dirty rectangles here
+            self._subrectangles.append(Rectangle(0, 0, self._width, self._height))
 
         for area in self._subrectangles:
             self._refresh_display_area(area)
@@ -353,7 +356,7 @@ class Display:
         if 0 <= float(value) <= 1.0:
             self._brightness = value
             if self._backlight_type == BACKLIGHT_IN_OUT:
-                self._backlight.value = int(round(self._brightness))
+                self._backlight.value = round(self._brightness)
             # PWM not currently implemented
             # Command-based brightness not implemented
         else: