cc Transform and Scroll Trees
Blink28628 Syys 2025

cc Transform and Scroll Trees

The source text details the architecture of Chromium's compositor, focusing on the tandem operation of two critical data structures: the Transform Tree and the Scroll Tree. The Transform Tree manages visual coordinate space transformations, including CSS transforms and scroll offsets, with each TransformNode calculating its final position relative to its parent using local matrices and the scroll translation. In parallel, the Scroll Tree, composed of ScrollNodes, handles the logical state of scrollable elements, defining constraints like scrollable bounds, allowed directions, and scroll chaining behavior. Crucially, the sources explain that the two trees are linked via a shared ElementId and that while the Scroll Tree determines how a scroll should happen (bounds and policy), the Transform Tree executes the change by holding and applying the live scroll_offset to visually move the layer content, enabling smooth, composite-threaded scrolling.

Jaksot(392)

Blink's Rendering: Fragment Tree to Layer Tree Conversion

Blink's Rendering: Fragment Tree to Layer Tree Conversion

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Blink's Document Class: Architecture and Lifecycle

Blink's Document Class: Architecture and Lifecycle

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HTML Evolution: Key Tags from 1990 to HTML5

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Chrome's Architectural Evolution: A Technical History

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TypeScript for C++ Developers: A Deep Dive

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HTML 5.3: Browser Implementation Insights

HTML 5.3: Browser Implementation Insights

The provided text offers insights into the HTML 5.3 specification, explaining its background, intended audience, scope, and historical development. It details how HTML evolved from a scientific docume...

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Oh My Zsh: A Developer's Comprehensive Usage Guide

Oh My Zsh: A Developer's Comprehensive Usage Guide

This comprehensive guide introduces Oh My Zsh (OMYZSH), an open-source framework designed to enhance the Zsh shell experience for developers. It covers essential installation steps for OMYZSH, includi...

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Chezmoi vs GNU Stow for Dotfiles Management

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This document offers a comprehensive comparison between Chezmoi and GNU Stow, two popular tools for managing dotfiles, which are configuration files in a user's home directory. It outlines their core ...

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