https://github.com/kkartaltepe/gopan-example

Example toy font renderer.
https://github.com/kkartaltepe/gopan-example

Last synced: 2 days ago
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Example toy font renderer.

• Host: GitHub
• URL: https://github.com/kkartaltepe/gopan-example
• Owner: kkartaltepe
• License: mit
• Created: 2020-04-01T06:01:29.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2022-12-26T23:23:59.000Z (about 2 years ago)
• Last Synced: 2024-12-12T06:05:12.982Z (22 days ago)
• Language: C
• Size: 173 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README
  • License: LICENSE

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README

        
A toy example of rendering font, but with all the parts actually needed.

Most examples provide a trivial call to the shaper but no font fallback. Or how

to choose fonts with fallbacks but no shaping. Almost all ignore fribidi (the

easiest step by far). Or dont even provide an example for rendering shaped

glyphs.

This example is based on pango since it has the most accessible code to review

and produces excellent output, if you need to render text you should use it.

We need some unicode information so there is a godawful golang script to build

some tables and enums from the UCD datafiles also provided. You can reference

glib's unicode tables and codegen scripts for a more typical approach to

building these (used in pango).

First we build a maximally covering set of fonts ordered by their close-ness to

the provided pattern (Fontconfig does a great job of this usually). Then we

break the input text into runs based on unicode properties and fonts available

(another often forgotten step this example is intended to showcase).  With runs

of consistent font and shaping properties we can get useful output from the

shaper. Finally we use the shaped glyphs and fonts and render (cairo can

rasterize the paths all on its own so it's extra easy to use).

The the code in this repository is provided under the GPLv3 or MIT, whichever

you prefer. Though its dependencies may be GPL.