kitepdf/io.github.yuroyami.kitepdf.font/CffFont

CffFont

class CffFont

CFF (Compact Font Format, Adobe Tech Note 5176) parser.

Used by PDF /FontFile3 for /Subtype /Type1C (CFF Type 1) and /Subtype /CIDFontType0C (CFF CIDFont). About half the embedded fonts in modern PDFs land here rather than as TrueType (which uses /FontFile2).

Coverage:

  • Header + Name INDEX + Top DICT + String INDEX + Global/Local Subrs.

  • CharStrings INDEX with Type 2 charstring → io.github.yuroyami.kitepdf.render.PdfPath conversion (see CharstringInterpreter).

  • Charsets format 0/1/2 → glyph-name lookup.

  • Encodings format 0/1 — for non-CIDFonts only (byte → SID → glyph name → GID).

  • CID-keyed fonts via FDSelect/FDArray (format 0 and 3).

Not yet handled: hint operators are skipped (we don't rasterize, so hints are ignored); flex operators are approximated as cubic Béziers; the Encoding /Differences override comes from the PDF layer (PdfFont).

Types

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object Companion

Properties

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val name: String
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val numGlyphs: Int

Functions

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fun glyphIdForCodePoint(codePoint: Int): Int

Glyph id for a Unicode codepoint — uses Adobe Glyph List → name → gid.

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fun glyphIdForName(name: String): Int

Glyph id for a PostScript glyph name; -1 if unknown.

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fun outline(glyphId: Int): PdfPath?

Returns the outline of glyphId, or null if it's empty / unparseable. Decoded outlines are cached: a glyph drawn N times runs the Type 2 charstring interpreter once, not N times.