ferroui_base::rendering::composition::server

Trait IServerCompositionSurface

pub trait IServerCompositionSurface: IServerObject {
    // Required methods
    fn bitmap(&self) -> Option<Arc<SharedBitmapImpl>>;
    fn changed(&self) -> &ServerCompositionSurfaceChanged;

    // Provided methods
    fn natural_size(&self) -> Option<Size> { ... }
    fn draw(
        &self,
        canvas: &mut dyn IDrawingContextImpl,
        dest: Rect,
        opacity: f64,
    ) { ... }
}

Expand description

Server-side counterpart of a composition surface: something that provides a bitmap to the surface visuals that show it.

The WinUI port adds the surfaces whose content is not a bitmap (a visual surface renders a visual subtree): what a surface visual or a surface brush shows goes through natural_size and draw, whose defaults use the bitmap.

Required Methods§

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fn bitmap(&self) -> Option<Arc<SharedBitmapImpl>>

The current content of the surface.

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fn changed(&self) -> &ServerCompositionSurfaceChanged

Raised when the content changed.

Provided Methods§

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fn natural_size(&self) -> Option<Size>

The size of the content in device independent pixels (the natural size of WinUI’s surfaces), which a surface brush lays out; None while the surface has no content. The default is the size of the bitmap at its DPI.

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