How does the Flutter rendering engine work under the hood?

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The Flutter rendering engine, primarily written in C++, is responsible for drawing UI elements to the screen. At its core is Skia, a 2D graphics library used to render everything from text to complex shapes.

When a Flutter app runs, it builds a widget tree, which is immutable and rebuilt every frame if needed. This widget tree creates a corresponding element tree (managing widget state) and a render tree composed of RenderObjects. The render tree handles layout and painting.

The rendering pipeline works in several stages:

1. Build Phase: Flutter builds the widget tree based on user code.

2. Layout Phase: RenderObjects calculate their sizes and positions.

3. Paint Phase: Each RenderObject paints itself onto a canvas, which generates layer trees.

4. Compositing: Layers are sent to the GPU. Flutter uses its own scene graph (via SceneBuilder) to create a Scene.

5. Rasterization: Skia rasterizes the scene and sends pixel data to the GPU for display.

Flutter communicates with the platform using a platform channel, but rendering is independent of native UI components, enabling consistent rendering across iOS, Android, desktop, and web.

The engine runs at 60 or 120 FPS, depending on hardware, and uses a frame scheduling system to keep animations smooth and responsive. The Dart UI thread builds the layer tree, while the GPU thread handles rendering, ensuring efficient multitasking.

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