Hit Testing Architecture in Blink and Chromium
Blink2862 Feb

Hit Testing Architecture in Blink and Chromium

This document explores the technical architecture of hit testing within the Chromium and Blink engines, the process used to link user input to specific interface elements. The system operates across multiple processes and threads, using the Viz compositor to route events correctly, especially when dealing with out-of-process iframes. While the Blink main thread performs the final, precise mapping using the layout tree and paint order, the compositor thread handles high-speed tasks like scrolling to minimize latency. Special mechanisms are also described for accessibility hit testing, which prioritizes immediate responsiveness through asynchronous tree updates. To maintain high performance, the engine employs caching strategies and coordinate translations that account for CSS transforms and device scaling. Overall, the text highlights how Chromium balances accuracy and speed by coordinating various rendering layers and hardware-accelerated components.

Avsnitt(391)

Google Gemini Command-Line Interface

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The Evolution and Deprecation of Blink’s PaintLayer Tree

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The provided text outlines the Blink rendering engine's multi-year transition away from its legacy PaintLayer tree toward a more efficient RenderingNG architecture. Traditionally, PaintLayers managed ...

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[EXPERT] The PaintLayer Tree in Blink Rendering

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The provided text explains the PaintLayer tree, an internal architectural component of Google Chrome’s Blink rendering engine that manages complex visual tasks. PaintLayers are selectively created for...

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[General] Inside Blink: The Paint Property Tree Builder Pipeline

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The PaintPropertyTreeBuilder is a critical component within Google Chrome’s Blink engine that converts layout data into structural property trees used for rendering. Operating during the PrePaint phas...

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Inside Blink: The Paint Property Tree Builder Pipeline

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The PaintPropertyTreeBuilder is a critical component within Google Chrome’s Blink engine that converts layout data into structural property trees used for rendering. Operating during the PrePaint phas...

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Promisify Scroll: Promise-Based Web Scrolling API

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The provided text describes a web platform initiative to modernize how browsers handle scrolling by having programmatic scroll methods return JavaScript Promises. Currently, functions like scrollTo() ...

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