blink::WebFrameWidgetImpl
Blink2869 Loka 2025

blink::WebFrameWidgetImpl

renderer‑main entry to Blink’s lifecycle.


This is where a compositor BeginFrame (coming in via content/public and mojo plumbing) first turns into Blink work on the renderer main thread. It receives the frame tick, decides what lifecycle phases to run (e.g. style/layout/paint), and pushes the work into the local root’s LocalFrameView. (Chromium Git Repositories)

Key fields (why they matter)

* scoped_refptr root_layer_ — holds the Blink‑owned root cc layer for this widget’s subtree; exists so Blink can update properties before the commit boundary. (Chromium Git Repositories)

* std::unique_ptr animation_host_ — lets main‑thread animations be driven and ticked in sync with lifecycle updates. (Chromium Git Repositories)

* std::unique_ptr layer_tree_view_ — the view side of the compositor connection that WebFrameWidgetImpl closes/tears down when the widget goes away. (Chromium Git Repositories)

Most important methods (how they advance the pixel)

* void BeginMainFrame(base::TimeTicks last_frame_time) — entry point for a new main‑thread frame; schedules lifecycle phase execution in Blink. (Chromium Git Repositories)

* void UpdateLifecycle(WebLifecycleUpdate requested_update, DocumentUpdateReason reason) — runs the Blink lifecycle (style → layout → pre‑paint/paint) as needed for this frame. (Chromium Git Repositories)

* void RecordEndOfFrameMetrics(base::TimeTicks frame_begin_time) — stamps timing for UMA/UKM; not directly pixel‑producing but tied to the same lifecycle boundary. (Chromium Git Repositories)

Hands off to: LocalFrameView of the local root to perform style/layout/paint.

Jaksot(403)

Chrome Finch Field Trial Configuration Deep Dive

Chrome Finch Field Trial Configuration Deep Dive

The source provides an extensive explanation of Chrome Finch Field Trials, which is the framework Chrome uses for running experiments and feature rollouts without requiring a full browser update. Spec...

11 Marras 202541min

Advanced Scrolling Scenarios – Fixed Elements, Sticky Positioning, and Lifecycle Coordination

Advanced Scrolling Scenarios – Fixed Elements, Sticky Positioning, and Lifecycle Coordination

The source provides an extensive technical explanation of how the Chrome rendering engine, Blink, and its Compositor implement advanced CSS scrolling features like position: fixed and position: sticky...

11 Marras 202551min

Chrome Compositor Tiling, Raster, and Scroll Optimization

Chrome Compositor Tiling, Raster, and Scroll Optimization

The source provides an extensive explanation of the Chrome Compositor's tiled rendering architecture, detailing how it achieves smooth scrolling and efficient visual updates. It outlines the process o...

11 Marras 202559min

LCD Text Rendering – Algorithm, Heuristics & Scroll Raster Impacts

LCD Text Rendering – Algorithm, Heuristics & Scroll Raster Impacts

The source text provides an extensive technical overview of LCD text rendering (subpixel antialiasing) within the Google Chrome browser's architecture, involving the Blink rendering engine and the Ski...

11 Marras 202542min

Compositor-Thread Scrolling – CC Mechanics and Property Trees

Compositor-Thread Scrolling – CC Mechanics and Property Trees

The source provides an extensive technical overview of Chrome’s Compositor-Thread Scrolling architecture, explaining how modern web rendering achieves smooth, low-latency scrolling by handling most sc...

11 Marras 202545min

Blink Main-Thread Scrolling – DOM, Layout, and Lifecycle

Blink Main-Thread Scrolling – DOM, Layout, and Lifecycle

The source provides an extensive technical overview of how the Blink rendering engine handles scrolling, particularly focusing on the main-thread scrolling lifecycle. It explains that while modern bro...

10 Marras 202545min

Architecture of Scrolling in Chrome (Blink vs. CC Overview)

Architecture of Scrolling in Chrome (Blink vs. CC Overview)

The source provides an extensive overview of the Chrome browser's scrolling architecture, detailing the division of labor between the Blink rendering engine (main thread) and the Chromium Compositor (...

10 Marras 202526min

[ext] Web View Transitions: Technical Deep Dive

[ext] Web View Transitions: Technical Deep Dive

The source provides an exhaustive technical and historical overview of the Web View Transition API, a modern set of web platform features designed to enable fluid, animated transitions between user in...

9 Marras 20251h 16min