cc::EffectTree
Blink2862 Marras 2025

cc::EffectTree

The source provides an extensive technical explanation of the Effect Property Tree within the Chromium compositor, which is crucial for managing how visual effects are applied to web content. This tree structure, composed of EffectNodes, decouples effects (such as opacity, filters, and blending modes) from the traditional layer hierarchy to centralize calculations, improving rendering performance. A primary function of the effect tree is determining when content must be rendered into a separate RenderSurface (an offscreen texture) for correct compositing, flagged by the render_surface_reason field for complex needs like filters or non-standard blend modes. The document details the structure of an EffectNode, including fields that track cumulative properties like screen_space_opacity and visibility flags like is_drawn, and explains how the effect tree seamlessly interacts with the Transform and Clip property trees to ensure correct coordinate spaces and boundaries are maintained during effect application. Finally, it addresses the tree's role in facilitating performant CSS animations by allowing real-time property updates on the compositor thread and ensuring stability through element identification.

Jaksot(397)

The Evolution and Deprecation of Blink’s PaintLayer Tree

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[EXPERT] The PaintLayer Tree in Blink Rendering

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The provided text explains the PaintLayer tree, an internal architectural component of Google Chrome’s Blink rendering engine that manages complex visual tasks. PaintLayers are selectively created for...

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CSS Sticky Positioning and Paint Property Trees

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[General] Inside Blink: The Paint Property Tree Builder Pipeline

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The PaintPropertyTreeBuilder is a critical component within Google Chrome’s Blink engine that converts layout data into structural property trees used for rendering. Operating during the PrePaint phas...

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Inside Blink: The Paint Property Tree Builder Pipeline

Inside Blink: The Paint Property Tree Builder Pipeline

The PaintPropertyTreeBuilder is a critical component within Google Chrome’s Blink engine that converts layout data into structural property trees used for rendering. Operating during the PrePaint phas...

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Promisify Scroll: Promise-Based Web Scrolling API

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The provided text describes a web platform initiative to modernize how browsers handle scrolling by having programmatic scroll methods return JavaScript Promises. Currently, functions like scrollTo() ...

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CSS Containing Blocks and Blink Engine Implementation

CSS Containing Blocks and Blink Engine Implementation

This text examines how CSS containing blocks function and how the Blink rendering engine implements these rules within Chromium. It explains that a containing block is the essential rectangular refere...

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Axis-Split Sticky Constraints in Chromium Layout and Compositing

Axis-Split Sticky Constraints in Chromium Layout and Compositing

Chromium is refining its rendering engine to support axis-split sticky constraints, allowing elements to stick to different scroll containers for horizontal and vertical movements. Previously, a singl...

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