CFF Fonts
Compact Font Format
CFF (Compact Font Format, Adobe Technical Note #5176) is the font format used by Type 1 and OpenType/CFF fonts embedded in PDF documents. CFF fonts encode glyph outlines using a compact binary format with shared subr routines.
CFF in PDF
PDF Type 1 fonts embed their glyph data in CFF format within the font file stream. OpenType fonts with CFF outlines are embedded as CID-keyed fonts in PDF.
DWT97 Processing
Aspose.PDF FOSS for Java includes internal processing utilities for CFF font data as part of the font subsetting and embedding pipeline. These are used automatically when creating documents with embedded fonts.
Font Handling
For developer use, font selection and embedding is managed through the high-level
Document and DefaultAppearance APIs. Direct CFF manipulation is an internal
implementation detail.