-static CVReturn displayLink_update_cb(CVDisplayLinkRef displayLink,
- const CVTimeStamp *inNow,
- const CVTimeStamp *inOutputTime,
- CVOptionFlags flagsIn,
- CVOptionFlags *flagsOut,
- void *ctxManager) {
+static CVReturn _updateDL(CVDisplayLinkRef displayLink,
+ const CVTimeStamp *inNow,
+ const CVTimeStamp *inOutputTime,
+ CVOptionFlags flagsIn,
+ CVOptionFlags *flagsOut,
+ void *ctxManager) {