Method releaseContext

src/platform/platform.dom.js:293–323

* @param {CanvasRenderingContext2D} context

(context)

	 * @param {CanvasRenderingContext2D} context
	 */
  releaseContext(context) {
    const canvas = context.canvas;
    if (!canvas[EXPANDO_KEY]) {
      return false;
    }

    const initial = canvas[EXPANDO_KEY].initial;
    ['height', 'width'].forEach((prop) => {
      const value = initial[prop];
      if (isNullOrUndef(value)) {
        canvas.removeAttribute(prop);
      } else {
        canvas.setAttribute(prop, value);
      }
    });

    const style = initial.style || {};
    Object.keys(style).forEach((key) => {
      canvas.style[key] = style[key];
    });

    // The canvas render size might have been changed (and thus the state stack discarded),
    // we can't use save() and restore() to restore the initial state. So make sure that at
    // least the canvas context is reset to the default state by setting the canvas width.
    // https://www.w3.org/TR/2011/WD-html5-20110525/the-canvas-element.html
    // eslint-disable-next-line no-self-assign
    canvas.width = canvas.width;

    delete canvas[EXPANDO_KEY];
    return true;
  }

  /**
	 *