ol-cesium/lib/olcs/util.js

OpenLayers Cesium integration library

let _imageRenderingPixelatedSupported = undefined;
let _imageRenderingValue = undefined;
/**
 * https://caniuse.com/mdn-css_properties_image-rendering_pixelated
 * @return whether the browser supports
 */
export function supportsImageRenderingPixelated() {
    if (_imageRenderingPixelatedSupported === undefined) {
        const canvas = document.createElement('canvas');
        canvas.setAttribute('style', 'image-rendering: -moz-crisp-edges; image-rendering: crisp-edges; image-rendering: pixelated;');
        // canvas.style.imageRendering will be undefined, null or an
        // empty string on unsupported browsers.
        const imageRenderingValue = canvas.style.imageRendering;
        _imageRenderingPixelatedSupported = !!imageRenderingValue;
        if (_imageRenderingPixelatedSupported) {
            _imageRenderingValue = imageRenderingValue;
        }
    }
    return _imageRenderingPixelatedSupported;
}
/**
 * The value supported by thie browser for the CSS property "image-rendering"
 * @return {string}
 */
export function imageRenderingValue() {
    supportsImageRenderingPixelated();
    return _imageRenderingValue || '';
}
/**
 * Return the projection of the source that Cesium should use.
 *
 * @param source Source.
 * @return The projection of the source.
 */
export function getSourceProjection(source) {
    return source.get('olcs.projection') || source.getProjection();
}
/**
 * Counter for getUid.
 * @type {number}
 */
let uidCounter_ = 0;
/**
 * Gets a unique ID for an object. This mutates the object so that further calls
 * with the same object as a parameter returns the same value. Unique IDs are generated
 * as a strictly increasing sequence. Adapted from goog.getUid. Similar to OL getUid.
 *
 * @param obj The object to get the unique ID for.
 * @return The unique ID for the object.
 */
export function getUid(obj) {
    return obj.olcs_uid || (obj.olcs_uid = ++uidCounter_);
}
export function waitReady(object) {
    const o = object;
    const p = o.readyPromise;
    if (p) {
        return p;
    }
    if (o.ready !== undefined) {
        if (o.ready) {
            return Promise.resolve(object);
        }
        return new Promise((resolve, _) => {
            // FIXME: this is crazy
            // alternative: intercept _ready = true
            // altnerative: pass a timeout
            const stopper = setInterval(() => {
                if (o.ready) {
                    clearInterval(stopper);
                    resolve(object);
                }
            }, 20);
        });
    }
    return Promise.reject('Not a readyable object');
}
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