blink::PaintController
Blink28610 Loka 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.


Jaksot(397)

Blink PaintPropertyTreeBuilder: Lifecycle, Operation, and Integration

Blink PaintPropertyTreeBuilder: Lifecycle, Operation, and Integration

The provided text offers a comprehensive technical examination of the PaintPropertyTreeBuilder within Blink’s rendering engine, detailing its function during the PrePaint phase of the document lifecyc...

16 Joulu 202531min

Blink's Flat Tree, Slotting, and Shadow DOM Internals

Blink's Flat Tree, Slotting, and Shadow DOM Internals

The provided text explains the internal workings of slotting and the flat tree within the Chromium/Blink rendering engine, detailing how Shadow DOM encapsulation is reconciled with the structure used ...

16 Joulu 202537min

CSS Scroll Mechanics and Blink Implementation Deep Dive

CSS Scroll Mechanics and Blink Implementation Deep Dive

The provided text is a deep technical analysis of CSS layout, scrolling, and Blink (Chromium) implementation, focusing heavily on modern web engine architecture. It begins by explaining fundamental CS...

14 Joulu 202559min

CSS Selectors Level 4: Specificity, Performance, and Scoping

CSS Selectors Level 4: Specificity, Performance, and Scoping

The provided text offers a comprehensive technical overview of CSS Selectors Level 4, detailing its fundamental role in binding style declarations to elements and its broad utility across CSS and Java...

13 Joulu 202528min

CSS Values and Units Level 4: The Foundation

CSS Values and Units Level 4: The Foundation

The provided document is an extensive technical overview of the CSS Values and Units Module Level 4, which defines the foundational system for how all values, units, and mathematical expressions are p...

13 Joulu 202527min

The Grammar and Parsing of CSS Syntax

The Grammar and Parsing of CSS Syntax

The provided source discusses the critical role of the CSS Syntax Module Level 3 specification as the fundamental grammar and parsing model for the entire CSS platform. This specification, which repla...

13 Joulu 202528min

Chromium Feature Toggles: Switches, Flags, and Blink Runtime

Chromium Feature Toggles: Switches, Flags, and Blink Runtime

The provided text offers a comprehensive technical overview of the four primary mechanisms utilized in Chromium for toggling features and behaviors at runtime. It distinguishes between command-line sw...

13 Joulu 202538min

Chrome's Raster-Inducing Scroll Architecture Deep Dive

Chrome's Raster-Inducing Scroll Architecture Deep Dive

The provided text details the architecture and mechanisms of raster-inducing scrolling within the Google Chrome rendering engine, explaining how Chrome balances scrolling performance with visual quali...

13 Joulu 202531min