getVisualBounds（）返回一个全0的维度

Question

以下代码无法读取给定韩语文本的边界矩形＆amp; font（NotoSansCJKKr-Regular.otf字体），尽管它在其他Google字体上运行良好。无论如何，这里有什么问题？

String text = "안녕하세요";
BufferedImage buf = new BufferedImage(1, 1 , BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = (Graphics2D)buf.getGraphics();
setRenderingHints(g2);
FontRenderContext frc = g2.getFontRenderContext();
GlyphVector glyph = g2.getFont().createGlyphVector(frc, text);
Rectangle rect = glyph.getVisualBounds().getBounds();

结果rect：

java.awt.Rectangle[x=0,y=0,width=0,height=0]