Move display splash screen code to base display class

Author: sfe-SparkFro

cv2_drivers/displays/cv2_display.py

@@ -137,3 +137,10 @@ def savePinModeAlt(self, pin):
 
         # Return the mode and alt as a tuple
         return (mode, alt)
+
+    def splash(self):
+        try:
+            self.imshow(cv2.imread("splash.png"))
+            return True
+        except Exception:
+            return False

examples/cv2_hardware_init/__init__.py

@@ -3,21 +3,31 @@
 # script to automatically initialize the hardware when the board boots up. See:
 # https://micropython.org/resources/docs/en/latest/reference/reset_boot.html#id4
 
+# Import the display driver
 try:
     from .display import display
 except:
     print("Display initialization failed, skipping...")
 
+# Optional - show a splash image on the display if one is available, or clear
+# the display of any previous content
+if not display.splash():
+    if hasattr(display, 'clear'):
+        display.clear()
+
+# Import the camera driver
 try:
     from .camera import camera
 except:
     print("Camera initialization failed, skipping...")
 
+# Import the touch screen driver
 try:
     from .touch_screen import touch_screen
 except:
     print("Touch screen initialization failed, skipping...")
 
+# Mount the SD card
 try:
     # We don't actually need to import anything here, just want to run the
     # sd_card module so the SD card gets mounted to the filesystem. So just
@@ -26,15 +36,3 @@
     del sdcard
 except:
     print("SD card initialization failed, skipping...")
-
-# Optional - show a splash image on the display if one is available, or clear
-# the display of any previous content
-try:
-    # Load and display a splash image, if one is available
-    import cv2
-    splash_image = cv2.imread("splash.png")
-    cv2.imshow(display, splash_image)
-except Exception:    
-    # No splash image, instead clear the display if the driver supports it
-    if hasattr(display, 'clear'):
-        display.clear()