opentypejs/opentype.js

TrueType Collection file. Error: Unsupported OpenType signature ttcf

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#379 opened on Apr 24, 2019

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enhancementgood first issue

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Description

I am trying to open font file with multiple styles inside.

Expected Behavior

font collection file is handled, opentype.js finds multiple fonts.

Current Behavior

image

Possible Solution

I have know idea to be honest :)

Steps to Reproduce (for bugs)

compile multiple ttf fonts into one file using this guide https://graphicdesign.stackexchange.com/a/104892/137343

Context

I want to get supported styles from font file

Your Environment

  • Version used: web preview
  • Font used: roboto from google fonts
  • Browser Name and version: latest stable firefox and chrome
  • Operating System and version (desktop or mobile): mac, ubuntu 19.04
  • Link to your project:

Contributor guide

Research direction
Investigate the TrueType Collection (TTC) file format, specifically the 'ttcf' signature. Modify the parsing logic in opentype.js to detect TTC files and handle multiple fonts by iterating through the font directory.
Tech stack
javascript
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
JavaScript
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60