libharu：HPDFPage#get_current_font_size

#!/usr/bin/env ruby

require "hpdf"

pdf  = HPDFDoc.new
page = pdf.add_page

p page.get_current_font_size

font = pdf.get_font("Helvetica", nil)
page.set_font_and_size(font, 24.0)
p page.get_current_font_size

で、

0.0
24.0