Reading and writing support for the X11 BDF font, PPM, PGM, XPM, BMP, JPEG, GIF, PNG image files, but also some very practical mapping function was useful!

• 该库支持读写X11 BDF字体、PPM、PGM、XPM、BMP、JPEG、GIF、PNG等图像文件，而且还有一些很实用的绘图函数，很有参考价值！