Layer Invalidation to Partial Swap
Blink28627 Marras 2025

Layer Invalidation to Partial Swap

The source details Chromium's damage tracking architecture, a critical mechanism within the cc compositor that identifies regions of the screen requiring redrawing to ensure rendering efficiency. This system distinguishes between content changes signaled by the renderer, known as paint invalidation, and internal compositor-driven updates, such as tile replacements, which generate damage rects. Changes propagate through the layer hierarchy via DamageTracker objects associated with RenderSurfaces, which carefully map localized layer modifications and property shifts (like transforms) into cumulative damage on the render target. In Chromium’s multi-process environment, the Viz SurfaceAggregator integrates damage rectangles from independently submitted child frames (SurfaceLayers) into a single, cohesive output. The final comprehensive damage rectangle is delivered with the CompositorFrame, enabling the graphics system to perform partial swaps and minimize buffer updates, thereby optimizing performance and power consumption. The architecture achieves efficiency by aggressively reusing unchanged resources, like previously rendered tiles and cached RenderPasses.

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Engineering CSS Anchor Positioning in the Chromium Blink Engine

Engineering CSS Anchor Positioning in the Chromium Blink Engine

The provided text describes the CSS Anchor Positioning API, a transformative layout feature implemented within the Chromium Blink engine. This technology shifts the responsibility for positioning elem...

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8 View Transition Lifecycle, Debugging, and Failure Handling

8 View Transition Lifecycle, Debugging, and Failure Handling

This lecture excerpt explores the technical lifecycle of the View Transition API in the Blink engine, focusing on how transitions conclude and handle errors. It details how specific JavaScript promise...

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7 Blink View Transition Discovery and UA Stylesheet Generation

7 Blink View Transition Discovery and UA Stylesheet Generation

This document details how the Blink rendering engine manages the technical lifecycle of View Transitions by coordinating DOM updates with visual animations. Once a developer triggers a transition, the...

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6 Blink and Compositor Handshake in View Transitions

6 Blink and Compositor Handshake in View Transitions

The provided text explains the technical handshake between the Blink rendering engine and the compositor during a web view transition. To ensure visual continuity, the system captures a snapshot of th...

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Evolution of CSS: Working Group Drafts and Processes

Evolution of CSS: Working Group Drafts and Processes

The provided text outlines the operations and standardizing procedures of the W3C CSS Working Group, which manages the evolution of web presentation through a modular specification system. It details ...

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5 View Transition Mechanics: Pre-paint and Snapshot Coordination

5 View Transition Mechanics: Pre-paint and Snapshot Coordination

The provided text explains how the Blink rendering engine manages view transitions by utilizing a stable coordinate space known as the snapshot root. This mechanism ensures that animations remain cons...

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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

GEM Modern CSS Scroll Positioning and Visibility Specifications

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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