Technical References

• Advanced Typography Tables
  • The GPOS, GSUB, GDEF and BASE OpenType tables
    • The GPOS table
    • The GSUB table
    • The GDEF table
  • Apple Advanced Typography
    • What features can be interconverted between OpenType and AAT?
      • An analysis of GSUB and morx sub-tables and feature tags
      • Why do contextual glyph substitutions only sometimes get generated in AAT?
      • Why can’t all contextual/chaining tables be converted?
    • Apple and OpenType features
  • What is Unsupported?
    • OpenType
    • Apple Advanced Typography
• Anti-Alias Comparison
• Autotracing bitmaps in FontForge
• Building Accented and other Composite Glyphs
• Bézier Splines
  • Converting TrueType to PostScript
  • Converting PostScript to TrueType
  • Open Type, another solution
    • See Also
• Caveats about References
• Changes to the sfd format
• Cidmap files
• Command Line Arguments
  • Environment Variables
• Data Types
  • Function declarations
• Delta Instruction Suggestions
• Expand Stroke Facility
  • Offsetting
    • Caps
    • Joins
  • Calligraphic and Other Convex Nibs
    • General convex nibs
    • Caps and Joins With Other Nibs
    • Multi-Nibs and “Pseudo-Concavity”
  • Other Parameters
    • Accuracy Target
    • Remove Overlap
    • External Only and Internal Only
    • Add Extrema and Simplify
    • Arcs Clip Algorithm
  • Troubleshooting
    • General Guidance
    • Cusps and Inverted Curvature
    • Bevel Caps and Flat Nibs
• Extensions to Adobe’s BDF for greymap fonts
• FontForge and TeX
  • Generating a tfm file (and an enc file).
  • Installing a type1 (pfb) postscript font for TeX
• FontForge’s math
  • Linear Transformations
  • Finding maxima and minima of a spline
  • Finding points of inflection of a spline
  • Rasterizing a glyph
  • Approximating a spline
    • Why that didn’t (quite) work
    • Singular matrices
  • Calculating the outline of a stroked path
    • A circular pen
    • An elliptical pen
    • A rectangular pen (a calligraphic pen)
    • An arbitrary convex polygonal pen
    • A pen of variable width
    • A pen at a varying angle
• Hinting
  • Serifs
  • Automatic Hinting
  • Manual Hinting
    • Manual Hint Substitution Points
    • Manual Counter Groups
    • The Private dictionary
  • Hints and previously existing fonts.
  • Hinting and TrueType
  • Hint questions:
• Macintosh font formats
  • Resource forks on Mac OS/X
• Major differences between FontForge’s and Adobe’s interpretation of feature files
  • Parsing a feature file
  • Outputting a feature file
• Non standard extensions used FontForge in True/Open Type
  • Non standard feature tags
  • Non standard tables.
  • ‘PfEd’ – the FontForge extensions table
    • ‘colr’ – the per-glyph color sub-table
    • ‘cmnt’ – the per-glyph comment sub-table
    • ‘fcmt’ – the font comment (and FONTLOG) sub-table
    • ‘cvtc’ – the cvt comments sub-table
    • ‘GPOS/GSUB’ – lookup names
    • ‘guid’ – guidelines
    • ‘layr’ – Background layer data
  • ‘TeX ‘ – the TeX metrics table
    • ‘htdp’ – the per-glyph height/depth sub-table
    • ‘sbsp’ – the per-glyph sub/super-script sub-table
    • ‘ftpm’ – the font parameter (font dimensions) sub-table
  • ‘BDF ‘ – the BDF properties table
  • ‘FFTM’ the FontForge time stamp table
• Palm fonts
• Several formats for bitmap only sfnts
  • Apple
  • X11 (Unix/Linux)
  • MS
• Spline Font Database
  • Font Header
  • Outline Character Data
    • TeX & MATH data
    • Outline character extensions for multilayered fonts (type3)
  • Bitmap Fonts
    • CID keyed fonts
    • Multiple Master fonts
  • SplineFont Directories
  • Autosave Format
• The X11 PCF bitmap font file format
  • File Header
  • Properties Table
  • Metrics Data
  • Accelerator Tables
  • Metrics Tables
  • The Bitmap Table
  • The Encoding Table
  • The Scalable Widths Table
  • The Glyph Names Table
• TrueType and OpenType tables supported by FontForge
• Unicode Corporate Characters used by FontForge
  • Greek Small Caps
  • Archaic and Rare Latin Ligatures
• UniqueID and XUID
• X Selections and the X Clipboard