make snapshots faster

raspberry-environment/display.py

@@ -231,8 +231,7 @@ if __name__ == '__main__':
       GPIO.output(pin_led_ready, GPIO.HIGH)
       GPIO.output(pin_led_busy, GPIO.HIGH)
       print('file changed')
-      subprocess.run(['killall', 'fim'], shell=False, check=False)
-      subprocess.run(['umount', '/mnt'], shell=False, check=False)
+
       subprocess.run(['mount', '-o', 'loop,ro', '-t', 'vfat', '/tmp/usbdisk.img', '/mnt'], shell=False, check=True)
 
       list_of_files = glob.glob('/mnt/*.png')
@@ -244,8 +243,13 @@ if __name__ == '__main__':
 
       if list_of_files:
         latest_file = max(list_of_files, key=os.path.getctime)
+        file_name, extension = os.path.splitext(latest_file)
+        tmpfilename = '/tmp/frame'+extension
         print(latest_file)
-        subprocess.run('fim -d /dev/fb0 -T 1 --autozoom --quiet "'+latest_file+'" &', shell=True)
+        subprocess.run(['killall', 'fim'], shell=False, check=False)
+        subprocess.run('cp "'+latest_file+'" "'+tmpfilename+'"', shell=True, check=True)
+        subprocess.run('fim -d /dev/fb0 -T 1 --autozoom --quiet "'+tmpfilename+'" &', shell=True)
+      subprocess.run(['umount', '/mnt'], shell=False, check=False)
       GPIO.output(pin_led_busy, GPIO.LOW)
 
     def callback_switch(channel):
@@ -253,7 +257,7 @@ if __name__ == '__main__':
 
 
     GPIO.add_event_detect(pin_switch, GPIO.FALLING, callback=callback_switch, bouncetime=250)
-    watch_delay_call('/tmp/usbdisk.img', callback, 0.5, True, pyinotify.IN_MODIFY)
+    watch_delay_call('/tmp/usbdisk.img', callback, 0.2, True, pyinotify.IN_MODIFY)
 
   finally:
     GPIO.output(pin_led_busy, GPIO.LOW)