cc Transform and Scroll Trees
Blink28628 Sep 2025

cc Transform and Scroll Trees

The source text details the architecture of Chromium's compositor, focusing on the tandem operation of two critical data structures: the Transform Tree and the Scroll Tree. The Transform Tree manages visual coordinate space transformations, including CSS transforms and scroll offsets, with each TransformNode calculating its final position relative to its parent using local matrices and the scroll translation. In parallel, the Scroll Tree, composed of ScrollNodes, handles the logical state of scrollable elements, defining constraints like scrollable bounds, allowed directions, and scroll chaining behavior. Crucially, the sources explain that the two trees are linked via a shared ElementId and that while the Scroll Tree determines how a scroll should happen (bounds and policy), the Transform Tree executes the change by holding and applying the live scroll_offset to visually move the layer content, enabling smooth, composite-threaded scrolling.

Episoder(417)

cc::EffectTree

cc::EffectTree

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cc::ClipTree

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cc::TransformTree

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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 coordi...

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This detailed audit examines the complete code path within Chromium that determines the raster_transform_ property of a cc::Tile, which is an immutable scale and translation used during rasterization....

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Chromium Compositor Tile Raster Transform Path Map

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The source provides an exhaustive technical mapping of how the Tile::raster_transform_ field is initialized and maintained within the Chromium compositor. It explains that this transform, which consis...

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The source provides an extensive technical overview of the cc::PictureLayerImpl class, a critical component in the rendering architecture of Chromium's compositor, responsible for processing content o...

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The source provides an extensive technical overview of the cc::PictureLayerImpl class, a critical component in the rendering architecture of Chromium's compositor, responsible for processing content o...

31 Okt 202536min

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