parseClip method
Implementation
ViewerElement<Rectangle<num>>? parseClip(node) {
return _parseViewerElement(node, ['clip', 'clipArea', 'cliparea'],
constructorValue: CanvasImageViewer.clipViewerElement,
mapperList: parseRectangleFromList,
mapperMap: (m) => parseRectangleFromMap(
m.map((key, value) => MapEntry('$key', value))));
}