afm

Documentation

Overview

Package afm implements a decoder for AFM (Adobe Font Metrics) files.

See:

• https://adobe-type-tools.github.io/font-tech-notes/pdfs/5004.AFM_Spec.pdf

for more informations.

Index

• type BBox
• type CharWidth
• type Direction
• type Font
  • func Parse(r io.Reader) (Font, error)
  • func (q Font) GetGlyphAdvance(charcode int) int

Types

type BBox

type BBox struct {
	LLX, LLY fixed.Int16_16
	URX, URY fixed.Int16_16
}

type CharWidth

type CharWidth struct {
	// contains filtered or unexported fields
}

type Direction

type Direction struct {
	// UnderlinePosition is the distance from the baseline for centering
	// underlining strokes.
	UnderlinePosition fixed.Int16_16

	// UnderlineThickness is the stroke width for underlining.
	UnderlineThickness fixed.Int16_16

	// ItalicAngle is the angle (in degrees counter-clockwise from the vertical)
	// of the dominant vertical stroke of the font.
	ItalicAngle fixed.Int16_16

	// CharWidth is the width vector of this font's program characters.
	CharWidth CharWidth

	// IsFixedPitch indicates whether the program is a fixed pitch (monospace) font.
	IsFixedPitch bool
}

type Font

type Font struct {
	// MetricsSets defines the writing Direction.
	// 0: Direction 0 only.
	// 1: Direction 1 only.
	// 2: both directions.
	MetricsSets int

	FontName   string // FontName is the name of the font program as presented to the PostScript language 'findfont' operator.
	FullName   string // FullName is the full text name of the font.
	FamilyName string // FamilyName is the name of the typeface family to which the font belongs.
	Weight     string // Weight is the Weight of the font (ex: Regular, Bold, Light).
	BBox       BBox   // BBox is the font bounding box.
	Version    string // Version is the font program Version identifier.
	Notice     string // Notice contains the font name trademark or copyright Notice.

	// EncodingScheme specifies the default encoding vector used for this font
	// program (ex: AdobeStandardEncoding, JIS12-88-CFEncoding, ...)
	// Special font program might state FontSpecific.
	EncodingScheme string
	MappingScheme  int
	EscChar        int
	CharacterSet   string // CharacterSet describes the character set (glyph complement) of this font program.
	Characters     int    // Characters describes the number of Characters defined in this font program.
	IsBaseFont     bool   // IsBaseFont indicates whether this font is a base font program.

	IsFixedV  bool // IsFixedV indicates whether vvector is the same for every character in this font.
	IsCIDFont bool // IsCIDFont indicates whether the font is a CID-keyed font.

	CapHeight fixed.Int16_16 // CapHeight is usually the y-value of the top of the capital 'H'.
	XHeight   fixed.Int16_16 // XHeight is typically the y-value of the top of the lowercase 'x'.
	Ascender  fixed.Int16_16 // Ascender is usually the y-value of the top of the lowercase 'd'.
	Descender fixed.Int16_16 // Descender is typically the y-value of the bottom of the lowercase 'p'.
	StdHW     fixed.Int16_16 // StdHW specifies the dominant width of horizontal stems.
	StdVW     fixed.Int16_16 // StdVW specifies the dominant width of vertical stems.

	Direction [3]Direction
	// contains filtered or unexported fields
}

Font is an Adobe Font metrics.

func Parse

func Parse(r io.Reader) (Font, error)

Parse parses an AFM file.

func (Font) GetGlyphAdvance

func (q Font) GetGlyphAdvance(charcode int) int