Font conversion: if the browser doesn't support a particular font in the slideshow, it needs to be rasterised on the server and then downloaded to the browser as images.
字体：如果浏览器不支持slideshow中的某种字体，那么需要在服务器上处理成图片传给浏览器。
This conversion requires running Xserver on UNIX except for Linux and Solaris platforms that use the GDFONTPATH environment variable pointing to True Type font folders.
除了使用指向 True Type 字体文件夹的 GDFONTPATH 环境变量的 Linux 和 Solaris 平台以外，此转换要求在 UNIX 上运行 Xserver。。
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