Mouse Cursor Occlusion & Compositor Transparency: Eliminating Translucent Overlay Trails & Pointer Stutter
Technical analysis of mouse pointer rendering during screen share. How hardware cursors, compositor alpha blending, and click-through mode prevent visual artifacts.
Even when a window is excluded from screen capture, an errant mouse pointer behavior can betray its presence. Understanding cursor rendering mechanics ensures zero visual artifacts.
Hardware Cursor Overlays vs. Software Cursor Blitting
Modern GPUs feature a dedicated hardware cursor plane drawn independently of the frame buffer. During screen sharing, Zoom composites the cursor into the video feed.
The Cursor Trap: Unexpected Hover States on Screen Share
If your mouse hovers over an private presenter windows, the OS may change the cursor icon to a text pointer (I-beam) or a hand pointer. To meeting participants viewing the empty desktop beneath, an I-beam over empty wallpaper looks anomalous.
Implementing Click-Through via OS Message Passing
Chameleon solves this with Click-Through mode: setting WS_EX_TRANSPARENT on Windows or ignoresMouseEvents = YES on macOS. Clicks and hover events pass through to underlying applications.
Preventing Frame Tearing & Ghosting Trails
By synchronizing compositor redraws with monitor V-Sync, Chameleon eliminates ghosting trails when moving windows across high-refresh-rate displays.