FragmentPaintPropertyTreeBuilder::UpdateScrollAndScrollTranslation()
Blink28618 Loka 2025

FragmentPaintPropertyTreeBuilder::UpdateScrollAndScrollTranslation()

The provided sources offer an extensive, line-by-line analysis of Blink’s rendering function, FragmentPaintPropertyTreeBuilder::UpdateScrollAndScrollTranslation(), which is critical for implementing scrolling behavior in Chrome. This function manages the creation and updating of two primary data structures: the Scroll Property Node (which defines the logical scroll container, including its viewport, content size, and CSS properties like overscroll behavior and scroll snapping) and the Scroll Translation Transform Node (which applies the negative scroll offset as a geometric translation to descendant content). The process is part of RenderingNG, which uses separate property trees (Transform, Clip, Effect, Scroll) to achieve efficient, incremental updates. The method ensures that only scrollable objects receive these nodes, updates related scrollbar Effect Nodes, and implements optimizations like directly updating the compositor's transform for simple scroll offset changes without rebuilding the entire paint artifact.

Jaksot(399)

Chromium Architecture: Input, Synchronization, and Animation Pipelines

Chromium Architecture: Input, Synchronization, and Animation Pipelines

These sources provide an extensive architectural overview of the core C++ classes that implement Chromium's input handling, synchronization, and animation systems. The documents detail the multi-proce...

25 Syys 202540min

CSS View Transition Pseudo-elements Explained

CSS View Transition Pseudo-elements Explained

These sources provide a detailed, technical explanation of the View Transition API implementation within the Chromium web browser, focusing on how CSS pseudo-elements enable smooth animations. The fir...

24 Syys 202538min

gpu::SkiaOutputSurfaceImplOnGpu / gpu::CommandBuffer

gpu::SkiaOutputSurfaceImplOnGpu / gpu::CommandBuffer

Bridges Skia’s recorded commands to the GPU command buffer; submits and SwapBuffers to present. (Backend: GL/Vulkan/Metal via GPU process.)

23 Syys 202532min

viz::SkiaRenderer

viz::SkiaRenderer

Renderer that turns quads into Skia operations (recording DDLs / drawing to the output surface).

23 Syys 202552min

viz::Display

viz::Display

The display compositor that walks the aggregated render passes and issues draw commands for the final output.

23 Syys 202538min

cc::LayerTreeHostImpl (Input Handler & Scroll Logic)

cc::LayerTreeHostImpl (Input Handler & Scroll Logic)

Scroll processing and overscroll detection in the compositor. The LayerTreeHostImpl in cc implements the compositor-thread InputHandler that processes gesture scroll updates and flings. It manages the...

23 Syys 202527min

blink::EventHandler (Blink core input handling)

blink::EventHandler (Blink core input handling)

Scroll chain builder and overscroll chaining logic. Blink’s EventHandler is responsible for building the scroll chain (the sequence of nested scrollable ancestors) when the user scrolls an element . I...

23 Syys 202526min

blink::ElasticOverscrollController

blink::ElasticOverscrollController

Overscroll orchestration and animation. This Blink-side controller manages the rubber-banding (elastic stretch and rebound) effect when a scrollable area is overscrolled. It observes gesture scroll ev...

23 Syys 202526min