Compositor-Thread Scrolling – CC Mechanics and Property Trees
Blink28611 Nov 2025

Compositor-Thread Scrolling – CC Mechanics and Property Trees

The source provides an extensive technical overview of Chrome’s Compositor-Thread Scrolling architecture, explaining how modern web rendering achieves smooth, low-latency scrolling by handling most scroll events off the main thread. This process relies on key data structures called property trees—specifically the ScrollTree, TransformTree, and ClipTree—which manage scroll offsets, geometric transformations, and viewport boundaries, respectively. The LayerTreeHostImpl orchestrates the sequence: it receives input events via the InputHandlerProxy, determines the scroll target via hit testing, updates the ScrollNode's offset, and leverages the TransformTree to translate content on the GPU without needing the main thread for layout or style updates. Additionally, the system details how it manages advanced features like scroll animations (flings), scroll snapping, platform-specific overscroll effects (elasticity/glow), and fallbacks to main-thread scrolling when necessary, ensuring the continuous flow of rendered frames.


Avsnitt(397)

Blink Implementation of View Transition Layer Participation

Blink Implementation of View Transition Layer Participation

The provided text explains how the Blink rendering engine manages elements during a View Transition API lifecycle. It details the criteria for participation, where elements must be assigned a unique v...

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Correcting Chained Anchor Fallback Selection in Blink

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Recent research highlights the shift from single AI models to multi-agent systems that use specialized roles to conquer complex programming challenges. These frameworks, such as Microsoft’s AutoGen an...

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Modern CSS has introduced scroll-triggered animations, a new feature that allows developers to initiate time-based effects when a user reaches specific scroll thresholds. Unlike scroll-driven animatio...

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In Chromium, sticky positioning is managed by the compositor thread to ensure smooth scrolling without relying on the main layout engine. The process begins on the main thread, where layout constraint...

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Modern Web Scrolling: Mechanics of Driven and Triggered Animations

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Modern web standards are evolving to support scroll-driven animations, which tie the progress of visual effects directly to a user’s scroll position rather than a standard clock. Traditionally, these ...

31 Jan 31min

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