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@pantheon-ai/opencode-font

OpenCode-style font package with text-to-SVG conversion and web fonts for pixel-art style text rendering.

📖 View Interactive Documentation

Overview

This package provides:

  • Grid-based pixel art font (OpenCodeLogo) with 32 glyphs (A-Z + 6 symbols: -|'"?!)
  • Web fonts in multiple formats (WOFF2, WOFF, TTF) optimized for modern browsers
  • JavaScript API for programmatic SVG text generation (two approaches)
    • Simple font-based SVG generation (convertTextToSVG)
    • Advanced blocky pixel-art rendering (blockyTextToSVG)
  • CSS helper for easy font integration

Installation

npm install @pantheon-ai/opencode-font

Quick Start

Option 1A: Blocky Pixel-Art SVG (Recommended for Logos)

Generate pixel-perfect SVG with blocky rendering and theme support:

import { blockyTextToSVG } from '@pantheon-ai/opencode-font';

const svg = blockyTextToSVG('OPENCODE', {
  theme: 'dark', // or 'light'
  blockSize: 6,
  charSpacing: 1,
  optimize: true, // Reduces file size by 30-40%
});

// Inject into your page
document.getElementById('logo').innerHTML = svg;

Option 1B: Simple Font-Based SVG

Generate SVG text using the OpenCodeLogo font:

import { convertTextToSVG } from '@pantheon-ai/opencode-font';

const svg = convertTextToSVG('OPENCODE', {
  fontSize: 48,
  color: '#00ff00',
});

// Inject into your page
document.getElementById('logo').innerHTML = svg;

Option 2: CSS Font Integration

Use the font directly in your CSS:

<!-- In your HTML -->
<link rel="stylesheet" href="node_modules/@pantheon-ai/opencode-font/css/opencode-font.css" />

<style>
  .pixel-text {
    font-family: 'OpenCodeLogo', monospace;
    font-size: 48px;
    color: #00ff00;
  }
</style>

<h1 class="pixel-text">OPENCODE</h1>

Option 3: Custom @font-face

For more control, define your own @font-face:

@font-face {
  font-family: 'OpenCodeLogo';
  src:
    url('node_modules/@pantheon-ai/opencode-font/fonts/OpenCodeLogo.woff2') format('woff2'),
    url('node_modules/@pantheon-ai/opencode-font/fonts/OpenCodeLogo.woff') format('woff');
  font-weight: normal;
  font-style: normal;
  font-display: swap; /* Recommended for web performance */
}

.my-text {
  font-family: 'OpenCodeLogo', monospace;
  text-transform: uppercase; /* Font only includes uppercase */
}

API Reference

Blocky Pixel-Art API

blockyTextToSVG(text, options)

Converts text to blocky pixel-art SVG with optimized paths and theme support.

Parameters:

  • text (string) — Text to convert (A-Z, -|'"?! supported)
  • options (object) — Configuration options:
    • theme ('light' | 'dark') — Color theme (default: 'light')
    • blockSize (number) — Size of each pixel block in pixels (default: 6)
    • charSpacing (number) — Space between characters in blocks (default: 1)
    • optimize (boolean) — Enable SVG path optimization (default: true)

Returns: SVG string with pixel-perfect rendering

Example:

const svg = blockyTextToSVG('HELLO', {
  theme: 'dark',
  blockSize: 6,
  charSpacing: 1,
  optimize: true,
});

Features:

  • Pixel-perfect rendering - No font rendering inconsistencies across browsers
  • Theme support - Built-in light/dark modes using OpenCode.ai colors
  • Variable-width characters - 1-5 columns depending on character
  • SVG optimization - Merges adjacent blocks for 30-40% size reduction
  • Consistent output - Identical across all browsers and platforms

When to use:

  • Logos and headers
  • Pixel-art style graphics
  • When you need exact pixel control
  • When consistency across browsers is critical

Simple Font-Based API

convertTextToSVG(text, options)

Converts text to an SVG string using the OpenCodeLogo font.

Parameters:

  • text (string) — Text to convert (A-Z, -|'"?! supported)
  • options (object) — Configuration options:
    • fontSize (number) — Font size in pixels (default: 48)
    • color (string) — Text color (default: #000)
    • fontFamily (string) — Font family name (default: OpenCodeLogo)
    • width (number) — SVG width (optional, auto-calculated)
    • height (number) — SVG height (optional, auto-calculated)
    • role (string) — ARIA role attribute (default: img)
    • ariaLabel (string) — ARIA label for accessibility (default: text content)

Returns: SVG string

Example:

const svg = convertTextToSVG('HELLO', {
  fontSize: 64,
  color: '#ff0000',
  role: 'img',
  ariaLabel: 'Hello message in pixel art style',
});

When to use:

  • Text-heavy content where file size matters
  • When you want browser-native font rendering
  • Dynamic text that changes frequently

API Comparison

Feature convertTextToSVG() blockyTextToSVG()
Rendering Font-based <text> Pixel-perfect paths
Browser consistency Depends on font rendering Identical everywhere
Theme support No Yes (light/dark)
Variable width Font-dependent Yes (1-5 columns)
Optimization No Yes (30-40% size reduction)
Customization Limited Full control (blocks, spacing)
Recommended for Text-heavy content Logos, headers, pixel-art

For complete blocky text API documentation, see src/alphabet/README.md.

Font Specifications

  • Character Set: ASCII uppercase (A-Z) + 6 symbols (-|'"?!)
  • Total Glyphs: 32
  • Design: 7×4 grid-based pixel art
  • File Sizes:
    • WOFF2: ~1.3 KB (recommended)
    • WOFF: ~1.8 KB
    • TTF: ~6.4 KB
  • Total Package Size: ~9.5 KB (all formats)

Browser Support

Modern browsers with WOFF2 support are recommended:

  • Chrome/Edge 36+
  • Firefox 39+
  • Safari 10+
  • Opera 23+

Fallback to WOFF for older browsers.

Development

Prerequisites

  • Bun v1.3.2+ or Node.js 20+

Setup

# Install dependencies
bun install

# Generate fonts
bun run generate:fonts

# Validate generated fonts
bun run validate:fonts

# Run tests
bun test

# Type check
bun run typecheck

# Build
bun run build

Font Generation

Fonts are automatically generated in CI pipelines and are not committed to version control. To generate fonts locally:

bun run generate:fonts

This creates:

  • fonts/OpenCodeLogo.woff2 (1.3 KB)
  • fonts/OpenCodeLogo.woff (1.8 KB)
  • fonts/OpenCodeLogo.ttf (6.4 KB)

Generation time: ~0.15s

Testing Changes

# Run all checks (format, lint, typecheck, tests)
bun run format:check
bun run lint
bun run typecheck
bun test

# Build to verify distribution
bun run build

Demo

Open demo/index.html in a browser to see an interactive demo of the font and SVG generation API.

Troubleshooting

Font not displaying correctly

Issue: Text appears in a fallback font instead of OpenCodeLogo

Solutions:

  1. Ensure fonts are generated: bun run generate:fonts
  2. Check font file paths in your CSS
  3. Verify fonts are included in your build output
  4. Check browser console for font loading errors
  5. Use font-display: swap to see fallback text while loading

Text shows as empty/blank

Issue: No text visible when using the font

Possible causes:

  • Font only supports uppercase A-Z and symbols -|'"?!
  • Lowercase letters are not included
  • Numbers are not included

Solution: Use text-transform: uppercase in CSS or convert text to uppercase in JavaScript:

const svg = convertTextToSVG(text.toUpperCase(), options);

Font files missing after npm install

Issue: fonts/ directory is empty

Cause: Fonts are generated during the publish process and included in the npm package

Solution:

  • If using from npm: Fonts should be present in node_modules/@pantheon-ai/opencode-font/fonts/
  • If using from source: Run bun run generate:fonts to generate fonts locally

Build/CI issues with font generation

Issue: Font generation fails in CI

Debugging steps:

  1. Check Node.js/Bun version compatibility (requires Node 20+ or Bun 1.3+)
  2. Ensure all dependencies are installed
  3. Check logs for specific error messages
  4. Verify scripts/generate-fonts.ts is present
  5. Run bun run validate:fonts to diagnose issues

Performance issues

Issue: Font loading impacts page performance

Solutions:

  1. Use WOFF2 format exclusively (smallest at 1.3 KB)
  2. Preload fonts for critical text: 
    <link rel="preload" href="fonts/OpenCodeLogo.woff2" as="font" type="font/woff2" crossorigin />
  3. Use font-display: swap to avoid FOIT (Flash of Invisible Text)
  4. Consider subsetting if you only need specific characters

Contributing

Font Generation Workflow

Fonts are automatically generated in CI and should not be committed to version control.

Development workflow:

  1. Make changes to scripts/generate-fonts.ts if modifying glyphs
  2. Run bun run generate:fonts to test locally
  3. Run bun run validate:fonts to verify output
  4. Commit changes (excluding fonts/*.ttf, fonts/*.woff, fonts/*.woff2)
  5. CI will generate fonts during validation and publishing

Font generation details:

  • Source: Grid-based glyph definitions in scripts/generate-fonts.ts
  • Pipeline: SVG glyphs → SVG font → TTF → WOFF/WOFF2
  • Tools: svgicons2svgfont, svg2ttf, ttf2woff, ttf2woff2
  • Time: ~0.15s locally, ~0.14s in CI

CI/CD Pipeline

This repository uses a fully automated CI/CD pipeline for testing, versioning, and publishing:

Workflow Overview

  1. Pull Request Validation (.github/workflows/1-validate.yml)

    • Runs on every PR to main
    • Generates fonts before validation
    • Executes: linting, type checking, tests with coverage, and build
    • Analyzes PR size and warns if too large

  2. Version Bumping (.github/workflows/2-version-update.yml)

    • Triggers after merge to main
    • Analyzes commits using conventional commit patterns
    • Automatically creates version bump PR based on changes:
      • feat: → minor version bump
      • fix: → patch version bump
      • BREAKING CHANGE or !: → major version bump

  3. Auto-Merge (.github/workflows/3-auto-merge.yml)

    • Automatically merges version bump PRs once checks pass
    • Validates PR format and author
    • Retries if checks are still pending

  4. Tag Creation (.github/workflows/4-create-tag.yml)

    • Creates git tag after version bump is merged
    • Tag format: v{major}.{minor}.{patch}
    • Triggers publishing workflow

  5. Publishing (.github/workflows/5-publish.yml)

    • Generates fonts for distribution
    • Publishes to npm with provenance (includes fonts in package)
    • Deploys demo to GitHub Pages (includes fonts)
    • Creates GitHub Release with changelog

Conventional Commits

Use conventional commit messages to control version bumping:

feat: add new feature          # minor bump (0.1.0 → 0.2.0)
fix: resolve bug               # patch bump (0.1.0 → 0.1.1)
feat!: breaking change         # major bump (0.1.0 → 1.0.0)
docs: update documentation     # patch bump (0.1.0 → 0.1.1)
chore: update dependencies     # patch bump (0.1.0 → 0.1.1)

Required Secrets

Add these secrets to your GitHub repository settings:

  • NPM_TOKEN - npm authentication token for publishing
  • WORKFLOW_PAT (optional) - Personal Access Token with repo and workflow permissions for auto-merge

Manual Version Bump

To manually trigger a version bump:

  1. Go to Actions → "2. Version Update (Create PR)"
  2. Click "Run workflow"
  3. Select version type: auto, major, minor, or patch

License

MIT

About

OpenCode-style font package with text-to-SVG conversion

pantheon-org.github.io/opencode-font/

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