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CGSEventLogEvent.png
CGSEventLogEvent.png
 
 
README.md
README.md
 
 

README.md

Persistent memory allocation issue in NSWindow's event logging

  • Platform: macOS
  • Area: Core Graphics
  • Type: Incorrect/Unexpected Behavior

Summary

We are experiencing an issue with persistent memory allocation in the internals of NSWindow when receiving a high volume of events that target that window. Even when configuring the window with ignoresMouseEvents set to true and acceptsMouseMovedEvents to false and not doing any event handling, it seems the window still receives mouse move events at a lower level. According to our tests, the issue appears to be linked to the internal logging of these incoming events, namely the routine called CGSEventLogEvent. See the attached screenshot of the Heaviest Stack Trace from an Instruments session.

Issue Reproduction

  1. Create an NSWindow and configure it according to the description from above.
  2. Expose the window to a high volume of mouse move events.
  3. Observe the memory allocation in relation to CGSEventLogEvent in Instruments.

Environment

Tested in Xcode 15.3 on macOS 14.4.1 Sonoma in both the debug mode and release mode with an attached debugger.