react-native-blurhash/lib/commonjs/index.js

🖼 Blurhash is a compact representation of a placeholder for an image. This is a Native UI Module for React Native to asynchronously wrap the Blurhash implementations and make them usable in React Native. Also supports encoding!

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.Blurhash = void 0;
var React = _interopRequireWildcard(require("react"));
var _reactNative = require("react-native");
var _NativeBlurhashModule = _interopRequireDefault(require("./specs/NativeBlurhashModule"));
var _NativeBlurhashView = _interopRequireDefault(require("./specs/NativeBlurhashView"));
var _utils = require("./utils");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function _getRequireWildcardCache(e) { if ("function" != typeof WeakMap) return null; var r = new WeakMap(), t = new WeakMap(); return (_getRequireWildcardCache = function (e) { return e ? t : r; })(e); }
function _interopRequireWildcard(e, r) { if (!r && e && e.__esModule) return e; if (null === e || "object" != typeof e && "function" != typeof e) return { default: e }; var t = _getRequireWildcardCache(r); if (t && t.has(e)) return t.get(e); var n = { __proto__: null }, a = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var u in e) if ("default" !== u && Object.prototype.hasOwnProperty.call(e, u)) { var i = a ? Object.getOwnPropertyDescriptor(e, u) : null; i && (i.get || i.set) ? Object.defineProperty(n, u, i) : n[u] = e[u]; } return n.default = e, t && t.set(e, n), n; }
function _extends() { _extends = Object.assign ? Object.assign.bind() : function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }
function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == typeof i ? i : String(i); }
function _toPrimitive(t, r) { if ("object" != typeof t || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != typeof i) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
class Blurhash extends React.PureComponent {
  constructor(props) {
    super(props);
    this._onLoadStart = this._onLoadStart.bind(this);
    this._onLoadEnd = this._onLoadEnd.bind(this);
    this._onLoadError = this._onLoadError.bind(this);
  }

  /**
   * Encodes the given image URI to a blurhash string
   * @param imageUri An URI to an Image parseable by the react native image loader
   * @param componentsX The number of X components
   * @param componentsY The number of Y components
   * @example
   * const blurhash = await Blurhash.encode('https://blurha.sh/assets/images/img2.jpg')
   */
  static encode(imageUri, componentsX, componentsY) {
    if (typeof imageUri !== 'string') throw new Error('imageUri must be a non-empty string!');
    if (typeof componentsX !== 'number') throw new Error('componentsX must be a valid positive number!');
    if (typeof componentsY !== 'number') throw new Error('componentsY must be a valid positive number!');
    return _NativeBlurhashModule.default.createBlurhashFromImage(imageUri, componentsX, componentsY);
  }

  /**
   * Gets the average color in a given blurhash string.
   *
   * This uses the JS blurhash decoder, so it might be slow.
   * @param blurhash The blurhash string
   * @example
   * const averageColor = Blurhash.getAverageColor(`LGFFaXYk^6#M@-5c,1J5@[or[Q6.`)
   */
  static getAverageColor(blurhash) {
    if (blurhash == null || blurhash.length < 7) return undefined;
    const value = (0, _utils.decode83)(blurhash.substring(2, 6));
    return (0, _utils.decodeDC)(value);
  }

  /**
   * Clears the cosine cache and frees up memory.
   *
   * @platform Android
   * @see https://github.com/mrousavy/react-native-blurhash#cosine-operations
   */
  static clearCosineCache() {
    if (_reactNative.Platform.OS === 'android') _NativeBlurhashModule.default.clearCosineCache();else console.warn('Blurhash.clearCosineCache is only available on Android.');
  }

  /**
   * Verifies if the given blurhash is valid by checking it's type, length and size flag.
   *
   * This uses the JS blurhash decoder, so it might be slow.
   * @param blurhash The given blurhash string
   */
  static isBlurhashValid(blurhash) {
    return (0, _utils.isBlurhashValid)(blurhash);
  }
  _onLoadStart() {
    if (this.props.onLoadStart != null) this.props.onLoadStart();
  }
  _onLoadEnd() {
    if (this.props.onLoadEnd != null) this.props.onLoadEnd();
  }
  _onLoadError(event) {
    var _event$nativeEvent;
    if (this.props.onLoadError != null) this.props.onLoadError(event === null || event === void 0 || (_event$nativeEvent = event.nativeEvent) === null || _event$nativeEvent === void 0 ? void 0 : _event$nativeEvent.message);
  }
  render() {
    return /*#__PURE__*/React.createElement(_NativeBlurhashView.default, _extends({}, this.props, {
      onLoadStart: this._onLoadStart,
      onLoadEnd: this._onLoadEnd,
      onLoadError: this._onLoadError
    }));
  }
}
exports.Blurhash = Blurhash;
_defineProperty(Blurhash, "displayName", 'Blurhash');
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