Blink's Rendering: Fragment Tree to Layer Tree Conversion
Blink2865 Sep 2025

Blink's Rendering: Fragment Tree to Layer Tree Conversion

The provided text details Blink's rendering pipeline, specifically focusing on the conversion of the Fragment Tree to the Layer Tree within Chromium's RenderingNG architecture. It explains how layout outputs, captured as an immutable Fragment Tree, are processed through a Pre-Paint phase to build paint property trees (for transforms, clips, effects, and scrolls). Subsequently, the Paint phase generates display items grouped into paint chunks, each associated with a property tree state. Finally, the layerization algorithm (handled by the PaintArtifactCompositor) evaluates these paint chunks, applying merging heuristics and compositing reasons, to create a cc::Layer tree ready for GPU rasterization and display, with CompositorElementIds ensuring efficient synchronization for animations and scrolling.

Episoder(391)

CSS Overflow Deep Dive and Blink Implementation

CSS Overflow Deep Dive and Blink Implementation

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CSS display: contents: Layout, Implementations, and Accessibility

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The text provides an extensive technical examination of the CSS value display: contents, which allows authors to remove an element's principal box from the rendering tree while preserving its descenda...

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WebView Crash: Finch Configuration Disaster

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The text analyzes the Android app stability crisis of March 2021, detailing how a global outage occurred when a configuration bug was deployed via Google’s remote experimentation system, Finch. This f...

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Hybrid Overscroll: Root Glow and Inner Bounce in WebView

Hybrid Overscroll: Root Glow and Inner Bounce in WebView

The provided text details the complex mechanisms governing overscroll behavior within the Android WebView and Chromium engine, specifically contrasting how the root content and non-root scrollable ele...

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