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(417)

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...

3 Jan 31min

[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

LayoutSVGForeignObject: Bridging SVG and HTML

LayoutSVGForeignObject: Bridging SVG and HTML

The provided text describes the LayoutSVGForeignObject class within Chromium’s Blink engine, which enables the integration of HTML and CSS content inside an SVG environment. Acting as a technical brid...

2 Jan 34min

StyleResolver: Blink Architecture and CSS Engine Deep Dive

StyleResolver: Blink Architecture and CSS Engine Deep Dive

The provided text outlines the StyleResolver within Google’s Blink rendering engine, detailing its pivotal role in converting CSS rules into final ComputedStyle objects for DOM elements. This complex ...

2 Jan 39min

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