Blink and Compositor Stacking Contexts
Blink28625 Sep 2025

Blink and Compositor Stacking Contexts

These sources provide an extensive technical explanation of how CSS stacking contexts are implemented within the Chromium rendering engine, focusing on the collaboration between the Blink renderer and the cc compositor. The process begins in Blink, where elements triggering a stacking context (via properties like opacity or z-index) are identified, leading to the creation of internal structures like PaintLayer and EffectPaintPropertyNode to manage z-ordering. Blink then produces a PaintArtifact consisting of drawing commands grouped into paint chunks, each linked to a specific set of property nodes that define the context's position, clipping, and effects. This artifact is passed to the cc compositor, which converts the Blink properties into its own PropertyTrees (especially the EffectNode), using this data to decide which stacking contexts require an isolated drawing buffer, known as a RenderSurfaceImpl, for final GPU compositing and accurate visual blending. Ultimately, Blink determines what is painted and ordered, and cc determines how to composite those results efficiently.

Avsnitt(417)

Blink Sticky Positioning: Constraint Updates and Paint Invalidation

Blink Sticky Positioning: Constraint Updates and Paint Invalidation

The provided documentation details how the Blink rendering engine manages sticky positioning through specific methods within the PaintLayerScrollableArea class. It explains that the system first calcu...

30 Dec 202530min

Blink’s Scrolling Engine: The PaintLayerScrollableArea Deep Dive

Blink’s Scrolling Engine: The PaintLayerScrollableArea Deep Dive

The provided text explains the PaintLayerScrollableArea, a central component within the Blink rendering engine that manages scrolling for web elements and viewports. It describes how this object bridg...

30 Dec 202531min

Understanding PropagatedData in Blink’s LayoutNG Fragment Tree

Understanding PropagatedData in Blink’s LayoutNG Fragment Tree

In Blink’s LayoutNG engine, PropagatedData serves as a specialized, light-weight container used to carry critical layout information upward through the fragment tree. This garbage-collected object is ...

30 Dec 202530min

Self-Painting Layers in Blink: Architecture and Implementation Decisions

Self-Painting Layers in Blink: Architecture and Implementation Decisions

In the Blink rendering engine, PaintLayers form a specialized hierarchy used to manage the visual assembly of a webpage, separate from the standard layout tree. These layers are created for elements r...

30 Dec 202539min

[EXTENDED] PaintLayer Parent Hierarchies in the Blink Rendering Engine

[EXTENDED] PaintLayer Parent Hierarchies in the Blink Rendering Engine

In the Blink rendering engine, the PaintLayer system utilizes multiple hierarchical relationships to manage how web content is displayed and organized. While the structural parent defines the primary ...

30 Dec 202536min

PaintLayer Parent Hierarchies in the Blink Rendering Engine

PaintLayer Parent Hierarchies in the Blink Rendering Engine

The provided text details the Blink rendering engine’s PaintLayer system, specifically focusing on the complex "parent" hierarchies used to manage web page display. It explains that while the structur...

29 Dec 202532min

Blink PrePaint: Fragment Traversal and Paint Property Tree Construction

Blink PrePaint: Fragment Traversal and Paint Property Tree Construction

The provided text explains the PrePaint phase within Blink’s rendering engine, a critical stage where the system prepares for visual output by invalidating old paint and building property trees. Durin...

29 Dec 202559min

Blink Core Paint Rendering Architecture

Blink Core Paint Rendering Architecture

This documentation details the Blink rendering engine's process for converting a LayoutObject tree into a format the compositor can process. The operation is split into two primary phases: PrePaint, w...

29 Dec 202541min

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