Method constructor

packages/melonjs/src/video/texture/atlas.js:105–304

* @param {object|object[]} atlases - atlas information. See loader.getJSON * @param {HTMLImageElement|HTMLCanvasElement|OffscreenCanvas|CompressedImage|string|OffscreenCanvas[]|HTMLImageElement[]|HTMLCanvasElement[]|string[]} [src=atlas.meta.image] - Image source * @param {boolean|object

(atlases, src, options)

	 * );
	 */
	constructor(atlases, src, options) {
		// backward compat: 3rd arg used to be a `cache` boolean.
		const opts =
			typeof options === "boolean" ? { cache: options } : options || {};
		const cache = opts.cache;
		const normalMap = opts.normalMap;
		/**
		 * to identify the atlas format (e.g. texture packer)
		 * @ignore
		 */
		this.format = null;

		/**
		 * the texture source(s) itself
		 * @type {Map}
		 * @ignore
		 */
		this.sources = new Map();

		/**
		 * paired normal-map source(s), keyed identically to `sources`.
		 * Populated from the constructor's `options.normalMap`. Used by
		 * the WebGL renderer's lit pipeline for per-pixel lighting.
		 * @type {Map}
		 * @ignore
		 */
		this.normalSources = new Map();

		/**
		 * the atlas dictionnaries
		 * @type {Map}
		 * @ignore
		 */
		this.atlases = new Map();

		/**
		 * the default "active" atlas (used for multiAtlas)
		 * @type {Map}
		 * @ignore
		 */
		this.activeAtlas = undefined;

		/**
		 * UV lookup cache to avoid per-frame string allocation in drawImage
		 * @ignore
		 */
		this._uvCache = { sx: -1, sy: -1, sw: -1, sh: -1, uvs: null };

		// parse given atlas(es) paremeters
		if (typeof atlases !== "undefined") {
			// normalize to array to keep the following code generic
			atlases = Array.isArray(atlases) ? atlases : [atlases];
			for (const i in atlases) {
				const atlas = atlases[i];

				if (typeof atlas.meta !== "undefined") {
					this.format = identifyFormat(atlas.meta.app);
					this.repeat = atlas.meta.repeat || "no-repeat";