Chrome Compositor LayerTree Architecture and Input Handling
Blink2867 Okt 2025

Chrome Compositor LayerTree Architecture and Input Handling

The text provides a detailed overview of the architecture and function of Chrome's Compositor (cc) component, specifically focusing on the core data structures: LayerTree and LayerTreeImpl. It explains that modern Chrome uses a multi-process model where LayerTreeHost manages the main-thread layer representation (Layer) while LayerTreeHostImpl manages the compositor-thread representation (LayerImpl), which is crucial for achieving asynchronous operations like scrolling. A key architectural element is the use of Property Trees (transform, clip, effect, scroll) to decouple geometric information from the layer hierarchy, facilitating efficient updates and thread synchronization via the commit-activation cycle. Furthermore, the document discusses how cc handles input events rapidly on the compositor thread and how it integrates with the separate Viz process for final frame composition and GPU resource management.


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