Convert DFONT to OTB FONT

The DFONT file extension stands for "Data Fork Font", a format used in Mac OS X (now macOS). Introduced to replace the older resource fork-based TrueType fonts, DFONT consolidates all font data into the data fork, enhancing compatibility with the OS X file system. Historically, DFONT was employed for system fonts like Courier and Helvetica, but it has been largely superseded by TrueType (TTF) and OpenType (OTF) formats. DFONT files are specific to macOS and cannot be used on Windows or Linux systems.

The OTB file extension, standing for "OpenType Bitmap", is a specialized format used in X11 for bitmap-only font files. It is a variant of the SFNT (scalable font) file format, tailored to store bitmap representations of fonts without vector outlines. Historically, OTB was developed to support the efficient rendering of fonts on systems with limited resources, ensuring the high-quality display of text. This format is particularly useful in environments where rendering performance is critical, such as older display systems or embedded systems.