cc::TransformTree
Blink2861 Nov 2025

cc::TransformTree

source provides a highly detailed technical overview of the Transform Property Tree within the Chromium compositor, which is a core component of the RenderingNG architecture responsible for all coordinate transformations and geometric calculations. This structure uses TransformNode entries to represent individual coordinate spaces, enabling the efficient computation and caching of transforms such as to_parent (local transform to the parent) and to_screen (global transform to the root viewport). Critically, the TransformTree handles complex visual features like CSS transforms, scrolling (treating offsets as translation matrices), 3D contexts and flattening, and pixel snapping to ensure visual precision, all while propagating animation status and damage tracking to minimize recalculations and allow off-main-thread updates.


Episoder(395)

4 Blink View Transition Pseudo-Element Tree and Layout Integration

4 Blink View Transition Pseudo-Element Tree and Layout Integration

The provided text explains how the Blink rendering engine manages View Transitions by generating a temporary pseudo-element subtree to represent page changes. This system acts as an overlay, capturing...

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GEM Modern CSS Scroll Positioning and Visibility Specifications

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These sources detail the CSS and DOM specifications that govern how elements are positioned and animated when moved into a user's visible area. The documentation introduces scroll-padding and scroll-m...

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[GENERAL] Modern CSS Scroll Positioning and Visibility Specifications

[GENERAL] Modern CSS Scroll Positioning and Visibility Specifications

These sources collectively define the technical standards for how web browsers handle scrolling and element visibility. The documentation details the CSSOM View Module's specific algorithm for the scr...

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Modern CSS Scroll Positioning and Visibility Specifications

Modern CSS Scroll Positioning and Visibility Specifications

These sources collectively define the technical standards for scroll-into-view behavior within modern CSS specifications, covering how elements are positioned and animated when navigated to or targete...

25 Jan 38min

Chromium Unified Test Runner: Architecture and Workflows

Chromium Unified Test Runner: Architecture and Workflows

The Unified Test Runner (UTR) is a specialized developer tool designed for the Chromium project to eliminate discrepancies between local testing and Continuous Integration (CI) environments. By utiliz...

25 Jan 31min

CSS Multi-Column Layout Modules 1 and 2

CSS Multi-Column Layout Modules 1 and 2

The provided text outlines the evolution and technical mechanics of CSS Multi-Column Layout, moving from the foundational features of Level 1 to the advanced proposals in Level 2. It explains how the ...

24 Jan 34min

Mastering CSS Fragmentation: Levels 3 and 4

Mastering CSS Fragmentation: Levels 3 and 4

CSS fragmentation describes the mechanical process of dividing web content across multiple containers, such as printed pages, layout columns, or digital regions. The provided sources detail the evolut...

24 Jan 36min

CSS Scroll Markers: Deep Dive into CSS Overflow Level 5

CSS Scroll Markers: Deep Dive into CSS Overflow Level 5

The provided text outlines CSS scroll markers, an emerging feature in the CSS Overflow Module Level 5 designed to create interactive navigation like carousels and tables of contents without JavaScript...

24 Jan 35min

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