Blink's PendingLayer: Bridge Between Paint and Compositor
Blink28615 Marras 2025

Blink's PendingLayer: Bridge Between Paint and Compositor

The document provides an extensive technical overview of the PendingLayer class, a critical internal component within Blink’s Composite After Paint (CAP) architecture. PendingLayer acts as a liaison, aggregating multiple Paint Chunks (painted content units) into a single logical unit that will eventually become a single cc::Layer in the Chromium compositor. The text details the class's structure, including fields for geometry, content references, and Compositing Type, and describes its transient lifecycle during the frame update process led by the PaintArtifactCompositor. Crucially, the document explains the complex layerization heuristics—including property tree compatibility, upcasting, overlap checks, and LCD text preservation—used to minimize the total layer count for improved performance while maintaining visual correctness. Finally, it outlines how this mechanism supports modern optimizations, such as partial repaint fast-paths and scroll unification, by providing stable layer structures across frames.

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LayoutSVGForeignObject: Bridging SVG and HTML

LayoutSVGForeignObject: Bridging SVG and HTML

The provided text describes the LayoutSVGForeignObject class within Chromium’s Blink engine, which enables the integration of HTML and CSS content inside an SVG environment. Acting as a technical brid...

2 Tammi 34min

StyleResolver: Blink Architecture and CSS Engine Deep Dive

StyleResolver: Blink Architecture and CSS Engine Deep Dive

The provided text outlines the StyleResolver within Google’s Blink rendering engine, detailing its pivotal role in converting CSS rules into final ComputedStyle objects for DOM elements. This complex ...

2 Tammi 39min

StyleAdjuster: Blink Rendering Engine

StyleAdjuster: Blink Rendering Engine

The provided text explains the StyleAdjuster component within the Blink rendering engine, which serves as a critical post-processing stage in the CSS style resolution pipeline. Positioned between init...

2 Tammi 37min

FragmentBuilder: Architecture and Role

FragmentBuilder: Architecture and Role

In Blink’s LayoutNG engine, the FragmentBuilder class serves as a vital instrument for generating immutable fragment trees, which represent the final geometric output of the layout process. This syste...

2 Tammi 37min

ObjectPaintProperties: Linking Layout and Painting in Blink Engine

ObjectPaintProperties: Linking Layout and Painting in Blink Engine

In the Blink rendering engine, the ObjectPaintProperties structure serves as a vital bridge between the layout and painting phases. It functions by organizing specific visual property nodes—such as tr...

2 Tammi 33min

BoxFragmentBuilder and Layout Architecture in Blink's LayoutNG

BoxFragmentBuilder and Layout Architecture in Blink's LayoutNG

The provided text details the BoxFragmentBuilder, a vital component within the Blink LayoutNG engine that constructs physical representations of layout elements. It acts as a transitional bridge, taki...

2 Tammi 39min

Pseudo-Elements in Blink's Layout Tree

Pseudo-Elements in Blink's Layout Tree

In the Blink rendering engine, CSS pseudo-elements are managed through specialized C++ classes and internal structures that link them to their originating DOM elements. These entities are dynamically ...

2 Tammi 42min

Clip Nodes in the Blink and Chromium Compositor

Clip Nodes in the Blink and Chromium Compositor

The provided text explains how Chromium’s Blink engine and the compositor utilize clip nodes within property trees to manage page geometry and visual masking. These nodes define specific regions where...

2 Tammi 35min