Reduce macOS idle resource usage

manga_ocr/run.py

@@ -153,6 +153,14 @@ def run(read_from='clipboard',
             on_press=on_key_press,
             on_release=on_key_release)
         tmp_paused_listener.start()
+
+        if sys.platform == "darwin" and 'objc' in sys.modules:
+            from AppKit import NSPasteboard, NSPasteboardTypePNG, NSPasteboardTypeTIFF
+            pasteboard = NSPasteboard.generalPasteboard()
+            count = pasteboard.changeCount()
+            mac_clipboard_polling = True
+        else:
+            mac_clipboard_polling = False
     else:
         read_from = Path(read_from)
         if not read_from.is_dir():
@@ -225,6 +233,16 @@ def run(read_from='clipboard',
 
         if read_from == 'clipboard':
             if not paused and not tmp_paused:
+                if mac_clipboard_polling:
+                    changed = False
+                    old_count = count
+                    count = pasteboard.changeCount()
+                    if not just_unpaused and count != old_count and any(x in pasteboard.types() for x in [NSPasteboardTypePNG, NSPasteboardTypeTIFF]):
+                        changed = True
+                else:
+                    changed = True
+
+                if changed:
                     old_img = img
 
                     try: