Chrome Compositor Transform Updates on Scroll
Blink2864 Okt 2025

Chrome Compositor Transform Updates on Scroll

These sources provide an extensive technical explanation of how the Chrome compositor manages dynamic properties, specifically focusing on transformations and scrolling, using a structure called PropertyTrees. The core mechanism for efficiency relies on granular dirty state propagation: when a property changes (like a scroll offset or animation), only the affected TransformNodes are marked as dirty (needs_local_transform_update) rather than forcing a full re-evaluation of the entire scene. The process, governed by UpdateTransformTree, ensures that changes—including complex interactions like elastic overscroll, fixed/sticky positioning, and pinch-zoom—are translated into updated screen-space layer matrices (transforms) by traversing only the dependent edges, thereby minimizing computational cost during each render frame. The sources clarify the tight coordination between the ScrollTree (which tracks offsets) and the TransformTree (which incorporates those offsets into actual layer movement matrices).


Avsnitt(417)

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The provided text details a technical implementation in the Blink rendering engine that enables single-axis scroll containers, allowing an element to scroll in one direction while remaining visible or...

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[EXTENDED] Blink and CC Thread: Implementing Position Sticky

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The provided text describes the technical workflow for managing sticky positioning within the Blink rendering engine and the Chromium compositor. This process begins on the main thread, where the engi...

2 Jan 42min

Blink and CC Thread: Implementing Position Sticky

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The provided text describes the technical workflow for managing sticky positioning within the Blink rendering engine and the Chromium compositor. This process begins on the main thread, where the engi...

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The provided text explains the PaintPropertyTreeBuilderTest, a C++ unit test suite within the Blink rendering engine of Chromium. This suite is essential for verifying the paint property trees—specifi...

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ScrollingTest: Suite

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The provided text describes the LayoutSVGForeignObject class within Chromium’s Blink engine, which enables the integration of HTML and CSS content inside an SVG environment. Acting as a technical brid...

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