blink::PaintArtifactCompositor
Blink28610 Okt 2025

blink::PaintArtifactCompositor

turns chunks into compositor layers & updates cc property trees.

Consumes the new PaintArtifact and does the layerization and property‑tree updates required for compositor draw. It supports fast paths when only values changed (e.g., opacity) or when a scroll only induces raster invalidation, avoiding full rebuilds. It owns a subtree of cc layers corresponding to the artifact. (Chromium Git Repositories)

Key fields

  • scoped_refptr<cc::Layer> root_layer_ — root of the Blink‑owned layer subtree.

  • UpdateType needs_update_ — kRepaint vs kFull (or scroll fast path).

  • Caches/maps for synthesized mask clips and scroll translations seen while layerizing. (Chromium Git Repositories)

Most important methods

  • bool TryFastPathUpdate(const PaintArtifact&) — take a cheap path (no topology change). (Chromium Git Repositories)

  • void Update(const PaintArtifact&, const ViewportProperties&, const StackScrollTranslationVector&, Vector<std::unique_ptr<cc::ViewTransitionRequest>>) — full reconciliation to layers + cc property trees. (Chromium Git Repositories)

  • “Direct update” helpers like DirectlyUpdateCompositedOpacityValue(...), DirectlyUpdateScrollOffsetTransform(...) — skip rebuilds for common animations/scrolling. (Chromium Git Repositories)

Hands off to: PropertyTreeManager (internally) to mirror Blink property nodes to cc trees, ready for commit to the compositor thread.


Episoder(395)

Implementing Scroll-Driven Animations in CSS and Blink Architecture

Implementing Scroll-Driven Animations in CSS and Blink Architecture

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Web Scrolling Mechanics: Focus and Viewport Synchronization

Modern web standards and browser engines utilize sophisticated mechanisms to manage how elements are scrolled into view during navigation or script execution. CSS properties like scroll-padding and sc...

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Single-Axis Scroll Containers: Motivation and Implementation

Single-Axis Scroll Containers: Motivation and Implementation

The provided text details a technical implementation in the Blink rendering engine that enables single-axis scroll containers, allowing an element to scroll in one direction while remaining visible or...

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[EXTENDED] Blink and CC Thread: Implementing Position Sticky

[EXTENDED] Blink and CC Thread: Implementing Position Sticky

The provided text describes the technical workflow for managing sticky positioning within the Blink rendering engine and the Chromium compositor. This process begins on the main thread, where the engi...

2 Jan 42min

Blink and CC Thread: Implementing Position Sticky

Blink and CC Thread: Implementing Position Sticky

The provided text describes the technical workflow for managing sticky positioning within the Blink rendering engine and the Chromium compositor. This process begins on the main thread, where the engi...

2 Jan 31min

Paint Property Tree Testing: A Deep Dive

Paint Property Tree Testing: A Deep Dive

The provided text explains the PaintPropertyTreeBuilderTest, a C++ unit test suite within the Blink rendering engine of Chromium. This suite is essential for verifying the paint property trees—specifi...

2 Jan 35min

ScrollingTest: Suite

ScrollingTest: Suite

The ScrollingTest suite is a vital collection of unit tests designed to ensure the Blink rendering engine handles web scrolling with precision and efficiency. It systematically verifies how the browse...

2 Jan 25min

StyleResolverTest: Technical Analysis

StyleResolverTest: Technical Analysis

The provided text outlines the StyleResolverTest, a comprehensive suite of unit tests within the Chromium Blink engine that verifies how CSS rules are matched and calculated for web elements. These te...

2 Jan 25min

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