zng_app::render

Trait Img

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pub trait Img {
    // Required methods
    fn renderer_id(&self, renderer: &ViewRenderer) -> ImageTextureId;
    fn size(&self) -> PxSize;

    // Provided method
    fn alpha_type(&self) -> AlphaType { ... }
}
Expand description

A loaded or loading image.

This trait is an interface for the renderer into the image API used in the application.

The ideal image format is BGRA with pre-multiplied alpha.

Required Methods§

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fn renderer_id(&self, renderer: &ViewRenderer) -> ImageTextureId

Gets the image ID in the renderer namespace.

The image must be loaded asynchronously by self and does not need to be loaded yet when the key is returned.

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fn size(&self) -> PxSize

Image pixel size.

Provided Methods§

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fn alpha_type(&self) -> AlphaType

Returns a value that indicates if the image is already pre-multiplied.

The faster option is pre-multiplied, that is also the default return value.

Implementors§