Represents the "FontDescriptor" entry of the cidfont dictionary object.

It is a required entry defined as part of the PDF 1.0 specification.

It contains a FontDescriptorElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 117, page 269.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 115, page 327.

The FontDescriptor here follows the same structure as for simple fonts but the font program is embedded as FontFile2 for CIDFontType2 or in a FontFile3 stream with Subtype CIDFontType0C for CIDFontType0.

Embedding the font program is required for PDF/A conformance and strongly recommended for all other uses to ensure consistent rendering.