FragmentPaintPropertyTreeBuilder::UpdateScrollAndScrollTranslation()
Blink28618 Loka 2025

FragmentPaintPropertyTreeBuilder::UpdateScrollAndScrollTranslation()

The provided sources offer an extensive, line-by-line analysis of Blink’s rendering function, FragmentPaintPropertyTreeBuilder::UpdateScrollAndScrollTranslation(), which is critical for implementing scrolling behavior in Chrome. This function manages the creation and updating of two primary data structures: the Scroll Property Node (which defines the logical scroll container, including its viewport, content size, and CSS properties like overscroll behavior and scroll snapping) and the Scroll Translation Transform Node (which applies the negative scroll offset as a geometric translation to descendant content). The process is part of RenderingNG, which uses separate property trees (Transform, Clip, Effect, Scroll) to achieve efficient, incremental updates. The method ensures that only scrollable objects receive these nodes, updates related scrollbar Effect Nodes, and implements optimizations like directly updating the compositor's transform for simple scroll offset changes without rebuilding the entire paint artifact.

Jaksot(403)

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

W3C CSS Snapshot of 2025: An Analysis of Specification Stability

W3C CSS Snapshot of 2025: An Analysis of Specification Stability

The sources consist of **excerpts from the W3C’s latest CSS Snapshot (2025)**, along with supporting context from **prior snapshots and Working Group publications**, which provide an in-depth analysis...

13 Joulu 202527min

Compositor Scheduler Lifecycle: Commit and Invalidation Coalescing

Compositor Scheduler Lifecycle: Commit and Invalidation Coalescing

These sources explain the lifecycle management of rendering trees within the Chromium compositor (cc), focusing on how the scheduler handles requests for updates. A core principle established is that ...

12 Joulu 202527min