code: float[] getMaxSize() {
      	float normal_leading = 0;
      	float image_leading = -10000;
          PdfChunk chunk;
          for (int k = 0; k < line.size(); ++k) {
              chunk = (PdfChunk)line.get(k);
              if (!chunk.isImage()) {
                  normal_leading = Math.max(chunk.font().size(), normal_leading);
              }
              else {
                  image_leading = Math.max(chunk.getImage().getScaledHeight() + chunk.getImageOffsetY(), image_leading);
              }
          }
          return new float[]{normal_leading, image_leading};
      }
docs: Gets the difference between the "normal" leading and the maximum
  size (for instance when there are images in the chunk).
  @return	an extra leading for images
  @since	2.1.5