blink::PaintController
Blink28610 Okt 2025

blink::PaintController

builds the display list + paint chunks and manages caching.

As painters call into GraphicsContext, they also drive a PaintController which groups drawing into display items and paint chunks (each keyed by the current property‑tree state). It also handles reuse of cached items to avoid repaint when nothing visually changed. Output is an immutable PaintArtifact. (Chromium Git Repositories)

Key fields

  • PaintArtifact* new_paint_artifact_ — being built for this frame;

  • PaintArtifact* old_paint_artifact_ — previous frame for cache matching;

  • PaintChunker paint_chunker_ — forms chunk boundaries based on property state;

  • PaintControllerPersistentData* persistent_data_ — holds prior artifact & subsequences. (Chromium Git Repositories)

Most important methods

  • UpdateCurrentPaintChunkProperties(const PropertyTreeStateOrAlias&) — starts/updates the current chunk when property state changes. (Chromium Git Repositories)

  • template <class T> CreateAndAppend(...) — appends a display item (records drawing op + metadata). (Chromium Git Repositories)

  • bool UseCachedItemIfPossible(...) — reuses prior items to skip repaints. (Chromium Git Repositories)

  • void BeginFrame(const void* frame) / FrameFirstPaint EndFrame(const void* frame) — delimit a painting pass for metrics + cache book‑keeping. (Chromium Git Repositories)

  • (Internals also maintain id→index maps to support O(1)/linear cache lookups.) (Chromium Git Repositories)

Hands off to: the PaintArtifact it produces.


Episoder(391)

Chromium Compositor Implementation of CSS Sticky Positioning

Chromium Compositor Implementation of CSS Sticky Positioning

In Chromium, sticky positioning is managed by the compositor thread to ensure smooth scrolling without relying on the main layout engine. The process begins on the main thread, where layout constraint...

31 Jan 31min

Modern Web Scrolling: Mechanics of Driven and Triggered Animations

Modern Web Scrolling: Mechanics of Driven and Triggered Animations

Modern web standards are evolving to support scroll-driven animations, which tie the progress of visual effects directly to a user’s scroll position rather than a standard clock. Traditionally, these ...

31 Jan 31min

Mastering Piper and CitC in the Google3 Monorepo

Mastering Piper and CitC in the Google3 Monorepo

This documentation provides a comprehensive overview of Piper, the proprietary version control system used to manage Google’s massive Google3 monorepo. It details how developers use CitC to create vir...

31 Jan 31min

Mastering CSS Pseudo-Elements: A Comprehensive Technical Guide

Mastering CSS Pseudo-Elements: A Comprehensive Technical Guide

CSS pseudo-elements act as "phantom" nodes that allow developers to style specific fragments of a document, such as the first line of a paragraph or user text selections, without altering the HTML str...

30 Jan 35min

Mastering CSS Compositing and Blending Mechanisms

Mastering CSS Compositing and Blending Mechanisms

This text explores the technical architecture and practical application of CSS compositing and blending, detailing how web browsers combine visual elements with their backgrounds. It distinguishes bet...

30 Jan 32min

CSS Backgrounds and Borders: A Technical Deep Dive

CSS Backgrounds and Borders: A Technical Deep Dive

This technical documentation provides an extensive analysis of CSS background and border properties, detailing their behavior, syntax, and implementation within modern browser engines like Blink. The ...

30 Jan 36min

Engineering CSS Anchor Positioning in the Chromium Blink Engine

Engineering CSS Anchor Positioning in the Chromium Blink Engine

The provided text describes the CSS Anchor Positioning API, a transformative layout feature implemented within the Chromium Blink engine. This technology shifts the responsibility for positioning elem...

28 Jan 35min

8 View Transition Lifecycle, Debugging, and Failure Handling

8 View Transition Lifecycle, Debugging, and Failure Handling

This lecture excerpt explores the technical lifecycle of the View Transition API in the Blink engine, focusing on how transitions conclude and handle errors. It details how specific JavaScript promise...

27 Jan 30min

Populært innen Teknologi

romkapsel
tomprat-med-gunnar-tjomlid
rss-avskiltet
teknisk-sett
nasjonal-sikkerhetsmyndighet-nsm
energi-og-klima
shifter
lydartikler-fra-aftenposten
elektropodden
rss-impressions-2
fornybaren
hans-petter-og-co
rss-alt-vi-kan
rss-ki-praten
pedagogisk-intelligens
smart-forklart
rss-fish-ships
rss-trippel-bunnlinje
rss-alt-som-gar-pa-strom
rss-ai-forklart