cc: Damage Calculation for Scroller Content Clips
Blink28610 Tammi

cc: Damage Calculation for Scroller Content Clips

Chromium’s compositor utilizes property trees to efficiently manage visual elements like clips and transforms during the rendering process. When a user scrolls, the system typically keeps the ClipNode stable while updating the TransformNode, a fast-path approach that avoids a full repaint. The DamageTracker then identifies specific screen regions that require redrawing by comparing the new state of layers against the previous frame. If a clip boundary itself is resized, the compositor treats it as a significant change and marks the entire affected surface as damage to ensure visual accuracy. Ultimately, these calculated damage rects allow the Viz display compositor to optimize performance by updating only the necessary pixels on the screen.

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