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pixel_font's Introduction

PixelFont

GitHub Workflow Status Coverage Status

"PixelFont" is an all-in-one tool for creating TrueType outline fonts from bitmap glyph data.

"PixelFont" implements a subset of the OpenType specification, purely in Elixir programming language.

Features

  • Builds full-featured font files which can be used in serious places.
  • Generates optimal pixelated TrueType outlines based on 1bpp bitmap images.
  • Supports creating fonts with OpenType advanced typographic features, namely GPOS and GSUB.
  • Provides DSL and data structures for defining...
    • Font metadata,
    • TrueType outline glyphs based on bitmap image,
    • Composite glyphs (maximum depth of 1 for now),
    • And a subset of GPOS and GSUB lookups.

If you are in doubt, see The NeoDunggeunmo Project.

Future Goals

  • Write some documentations and tests.
  • Implement more GPOS and GSUB lookup subtables.
  • Wrap all the struct craziness with Elixir DSL. Specifically, provide user experience somewhat similar to using GUI-based font development software... via Elixir DSL. (Good luck!)

License

Copyright 2024 Eunbin Jeong (Dalgona.) <[email protected]>

This project is still under early development, but its source codes are released under the MIT license. See LICENSE file for the full text.

OpenType is a registered trademark of Microsoft Corporation.

TrueType is a trademark of Apple Inc., registered in the United States and other countries.

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pixel_font's Issues

Implement GPOS/GSUB Lookup Tables

Part of this description was taken from neodgm/neodgm#12.

GPOS

  • Lookup Type 1: Single Adjustment Positioning
    • Format 1: Single Positioning Value
    • Format 2: Array of Positioning Values
  • Lookup Type 2: Pair Adjustment Positioning
    • Format 1: Adjustments for Glyph Pairs
    • Format 2: Class Pair Adjustment
  • Lookup Type 3: Cursive Attachment Positioning
    • Format 1: Cursive Attachment
  • Lookup Type 4: Mark-to-Base Attachment Positioning
    • Format 1: Mark-to-Base Attachment Point
  • Lookup Type 5: Mark-to-Ligature Attachment Positioning
    • Format 1: Mark-to-Ligature Attachment
  • Lookup Type 6: Mark-to-Mark Attachment Positioning
    • Format 1: Mark-to-Mark Attachment
  • Lookup Type 7: Contextual Positioning
    • Format 1: Simple Glyph Contexts
    • Format 2: Class-based Glyph Contexts
    • Format 3: Coverage-based Glyph Contexts
  • Lookup Type 8: Chaining Contextual Positioning
    • Format 1: Simple Glyph Contexts
    • Format 2: Class-based Glyph Contexts
    • Format 3: Coverage-based Glyph Contexts
  • Lookup Type 9: Extension Positioning
    • Format 1

Shared Tables

  • Value Record
  • Anchor Table
  • Mark Array Table

GSUB

  • Lookup Type 1: Single Substitution
    • Format 1: Many to one delta
    • Format 2: One to one
  • Lookup Type 2: Multiple Substitution
    • Format 1
  • Lookup Type 3: Alternate Substitution
    • Format 1
  • Lookup Type 4: Ligature Substitution
    • Format 1
  • Lookup Type 5: Contextual Substitution
    • Format 1: Simple Glyph Contexts
    • Format 2: Class-based Glyph Contexts
    • Format 3: Coverage-based Glyph Contexts
  • Lookup Type 6: Chained Contexts Substitution
    • Format 1: Simple Glyph Contexts
    • Format 2: Class-based Glyph Contexts
    • Format 3: Coverage-based Glyph Contexts
  • Lookup Type 7: Extension Substitution
    • Format 1
  • Lookup Type 8: Reverse Chaining Contextual Single Substitution
    • Format 1

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