Automattic/node-canvas

Allow registering custom fonts from a buffer

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#386 opened on Feb 13, 2014

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FeatureHelp wantedText & Fonts

Description

For use with jsdom package which simulates browser DOM in node.js and use node-canvas for canvas implementation a support to load fonts (truetype and openfont) from a buffer/content is needed. Because in HTML a custom font face can be specified as an URL, jsdom resolves this URL to a buffer/content by itself. So registration with buffer/content should be possible.

See https://github.com/tmpvar/jsdom/issues/744 for more details.

Contributor guide

Tech stack
javascriptnodejsc
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
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.
clear
Prerequisites
Node.js basicsBuffer API understandingFamiliarity with node canvas
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
This issue requests the ability to register custom fonts from a buffer. Start by examining the existing font registration code in node canvas, likely in `src/Font.cc` or `src/Font.h`. Review how fonts are currently loaded from files and identify the APIs that need modification. The linked jsdom issue (tmpvar/jsdom#744) provides context about the use case. Consider using Cairo's `cairo ft font face create for ft face` or similar functions to load fonts from memory. Look for existing discussions in the issue comments for any proposed approaches.