blink::PaintArtifactCompositor
Blink28610 Loka 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.


Jaksot(395)

Chrome RenderingNG: Paint Artifact and Compositor Architecture

Chrome RenderingNG: Paint Artifact and Compositor Architecture

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Browser Rendering: Calculating Draw Properties

Browser Rendering: Calculating Draw Properties

The source provides an extensive explanation of the internal browser rendering mechanism used in Blink and Chrome, specifically focusing on the CalculateDrawProperties algorithm. This process translat...

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Chrome Compositor Transform Updates on Scroll

Chrome Compositor Transform Updates on Scroll

These sources provide an extensive technical explanation of how the Chrome compositor manages dynamic properties, specifically focusing on transformations and scrolling, using a structure called Prope...

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Chrome Compositor Architecture: LayerTreeHost and LayerTreeHostImpl

Chrome Compositor Architecture: LayerTreeHost and LayerTreeHostImpl

The sources provide an extensive architectural overview of the Chrome cc compositor module, focusing on the collaboration between three critical classes: LayerTreeHost (LTH), LayerTreeHostImpl (LTHI),...

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Chromium Blink's Layer Recycle Tree Optimization

Chromium Blink's Layer Recycle Tree Optimization

The sources provide an extensive technical explanation of the Chromium/Blink rendering pipeline, focusing specifically on the compositor's layer trees and a performance optimization known as the Recyc...

3 Loka 202529min

Chromium Compositor's CalculateDrawProperties: Scrolling and Overscroll

Chromium Compositor's CalculateDrawProperties: Scrolling and Overscroll

The sources provide an extremely detailed, line-by-line breakdown of the Chromium compositor function CalculateDrawProperties, explaining how it prepares the active layer tree for rendering. A primary...

3 Loka 202530min

Git Rebase and Interactive Rebase for Chromium Development

Git Rebase and Interactive Rebase for Chromium Development

The sources provide a comprehensive guide to Git rebasing and interactive rebasing, explaining how these powerful tools rewrite commit history to maintain a clean, linear project record. They detail t...

2 Loka 202536min

Chrome Finch System Technical Guide and Rollouts

Chrome Finch System Technical Guide and Rollouts

The source text provides an exhaustive technical guide to Chrome’s Finch (Variations) system, a mechanism used for running field trials and A/B experiments to control browser features remotely. This s...

1 Loka 20251h 14min