* @return a list of Picture objects found in current document
*/
public List getAllPictures() {
ArrayList pictures = new ArrayList();
Range range = _document.getRange();
for (int i = 0; i < range.numCharacterRuns(); i++) {
CharacterRun run = range.getCharacterRun(i);
String text = run.text();
Picture picture = extractPicture(run, false);
if (picture != null) {
pictures.add(picture);
}