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(399)

B6: RenderProcessHost: Lifecycle and Architecture Management

B6: RenderProcessHost: Lifecycle and Architecture Management

The provided documents outline the essential functions of the RenderProcessHost (RPH), a crucial component within Chromium's multi-process architecture that resides in the browser process to manage a ...

28 Marras 202532min

B5: Platform View Architecture

B5: Platform View Architecture

The source provides an architectural overview of Layer 5 in Chromium, which is responsible for interfacing the browser’s content output with the native operating system view layer. This layer is struc...

28 Marras 202533min

B4: Render Host Layer: RVH and RWH

B4: Render Host Layer: RVH and RWH

The technical documentation provides an extensive overview of two crucial browser-side components in Chromium's multi-process architecture: the RenderViewHost (RVH) and the RenderWidgetHost(RWH). The ...

28 Marras 202539min

B3: RenderFrameHost: Core Document Lifeline

B3: RenderFrameHost: Core Document Lifeline

The source documentation provides a detailed analysis of the RenderFrameHost (RFH) and its implementing class, RenderFrameHostImpl, which constitute the essential browser-side representation of every ...

28 Marras 202534min

B2: Frame Tree Navigation and Process Management

B2: Frame Tree Navigation and Process Management

This document details the Chromium browser's Layer 2 architecture, which is responsible for coordinating the structure and navigation of complex webpages across multiple renderer processes. The core o...

27 Marras 202544min

B1: WebContents: The Foundation of Chromium Tabs

B1: WebContents: The Foundation of Chromium Tabs

The text thoroughly analyzes the foundational structure of Chromium's architecture, which controls the browser window and tab strip elements. This system relies on a central Browser class acting as th...

27 Marras 202547min

B0: Governing Browser Windows and Tabs

B0: Governing Browser Windows and Tabs

The text thoroughly analyzes the foundational structure of Chromium's architecture, which controls the browser window and tab strip elements. This system relies on a central Browser class acting as th...

27 Marras 202535min

CSS Anchor Positioning in LayoutNG

CSS Anchor Positioning in LayoutNG

The sources provide a comprehensive specification deep dive into CSS Anchor Positioning, a modern layout module designed to position elements like tooltips and popovers relative to an anchor without r...

27 Marras 202545min