Font Hinting

Fontisan provides tools for working with font hinting data.

Overview

Font hinting (also known as instructing) is the process of adjusting the display of fonts to align with a pixel grid, improving legibility at small sizes.

Hinting Formats

• fpgm/cvt/prep - TrueType instructions
• gasp - Grid-fitting and scan-conversion procedure
• GPOS/GSUB - OpenType positioning and substitution

Reading Hinting Data

require 'fontisan'

font = Fontisan.load('font.ttf')

# Check for TrueType instructions
if font.trueType_instructions?
  puts "Font has TrueType hinting"
end

# Get gasp table
if font.gasp_table
  font.gasp_table.ranges.each do |range|
    puts "Size #{range.range_max_ppem}: #{range.behavior}"
  end
end

Auto-Hinting

# Apply auto-hinting
Fontisan.autohint('font.ttf', output: 'font-hinted.ttf')

Related

• Font Conversion - Convert fonts while preserving hinting