script::canvas_context

Trait CanvasContext

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pub(crate) trait CanvasContext {
    type ID;

    // Required methods
    fn context_id(&self) -> Self::ID;
    fn canvas(
        &self,
    ) -> Option<HTMLCanvasElementOrOffscreenCanvas<DomTypeHolder>>;
    fn resize(&self);
    fn reset_bitmap(&self);
    fn get_image_data(&self) -> Option<Snapshot>;
    fn image_key(&self) -> Option<ImageKey>;

    // Provided methods
    fn origin_is_clean(&self) -> bool { ... }
    fn size(&self) -> Size2D<u32> { ... }
    fn mark_as_dirty(&self) { ... }
    fn update_rendering(&self, _canvas_epoch: Epoch) -> bool { ... }
    fn onscreen(&self) -> bool { ... }
}

Required Associated Types§

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type ID

Required Methods§

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fn context_id(&self) -> Self::ID

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fn canvas(&self) -> Option<HTMLCanvasElementOrOffscreenCanvas<DomTypeHolder>>

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fn resize(&self)

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fn reset_bitmap(&self)

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fn get_image_data(&self) -> Option<Snapshot>

Returns none if area of canvas is zero.

In case of other errors it returns cleared snapshot

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fn image_key(&self) -> Option<ImageKey>

The WebRender ImageKey of this CanvasContext if any.

Provided Methods§

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fn origin_is_clean(&self) -> bool

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fn size(&self) -> Size2D<u32>

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fn mark_as_dirty(&self)

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fn update_rendering(&self, _canvas_epoch: Epoch) -> bool

Request that the CanvasContext update the rendering of its contents, returning true if new image was produced.

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fn onscreen(&self) -> bool

Implementors§