@self.id/image-utils/dist/selection.js

Image utilities for Self.ID profiles

const DEFAULT_DIMENSIONS = {
    height: 512,
    width: 512
};
function selectCover(options, { height , width  }) {
    let selected = null;
    for (const option of options){
        if (option.height >= height && option.width >= width && (selected === null || selected.size != null && option.size != null && option.size < selected.size || option.height * option.width < selected.height * selected.width)) {
            selected = option;
        }
    }
    return selected;
}
function selectContain(options, { height , width  }) {
    let selected = null;
    for (const option of options){
        if (option.height <= height && option.width <= width && (selected === null || selected.size != null && option.size != null && option.size < selected.size || option.height * option.width > selected.height * selected.width)) {
            selected = option;
        }
    }
    return selected;
}
/** Select the best option from the given `sources` to match the wanted `dimensions` and `mode`. */ export function selectImageSource(sources, dimensions, mode = 'cover') {
    let alternative = null;
    if (Array.isArray(sources.alternatives)) {
        alternative = mode === 'cover' ? selectCover(sources.alternatives, dimensions) : selectContain(sources.alternatives, dimensions);
    }
    return alternative ?? sources.original;
}
/** @internal */ export function getDimensions(image, dimensions = DEFAULT_DIMENSIONS, mode = 'cover') {
    let width = image.width;
    let height = image.height;
    if (mode === 'contain' && width >= height || mode === 'cover' && width <= height) {
        if (width >= dimensions.width) {
            height = Math.round(height * dimensions.width / width);
            width = dimensions.width;
        }
    } else if (height > dimensions.height) {
        width = Math.round(width * dimensions.height / height);
        height = dimensions.height;
    }
    return {
        width,
        height
    };
}