kitepdf/io.github.yuroyami.kitepdf.font/TrueTypeFont

TrueTypeFont

class TrueTypeFont

Pure-Kotlin TrueType / OpenType font parser.

Reads the subset of SFNT tables needed to render glyphs: head, maxp, hhea, hmtx, cmap, loca, glyf. Composite glyphs are supported with argument transforms; emoji-style colour tables (COLR/CPAL/sbix/CBDT) are not yet handled — those are extras layered on top of plain outline data, so without them you still get monochrome shapes.

The font keeps the original byte buffer alive; lookups are lazy and cached via Cache. That keeps memory flat — most PDFs reference 50–200 glyphs from a font containing thousands.

Types

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object Companion

Properties

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val cmap: TtfCMap
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val head: Head
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val hhea: Hhea
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val hmtx: Hmtx
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val maxp: Maxp
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val numGlyphs: Int
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val unitsPerEm: Int

SFNT version: 0x00010000 (TrueType outlines) or "OTTO" / "true" / "typ1".

Functions

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fun advanceWidth(glyphId: Int): Int

Glyph advance width in font design units.

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fun glyphIdForCodePoint(codePoint: Int): Int

Convert a unicode codepoint to a glyph index, or 0 (.notdef) if unmapped.

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fun outline(glyphId: Int): GlyphOutline?

Get the outline for glyphId, or null if the glyph slot is empty (zero-length).

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fun outlinePath(glyphId: Int): PdfPath?

Outline as a PdfPath, cached — the GlyphOutline → PdfPath conversion is built once per glyph, not on every draw.