Freetype2 module unavailable

zhouzhi123.8 · November 17, 2023, 2:23am

I build OpenCV 4.6.0 from source code on Ubuntu 18.04, all extra modules which I need installed successfully except freetype2, How to fix it? thanks

below is my build info

Should I install any dependence before freetype2 ?

berak · November 17, 2023, 8:28am

yes, ofc. …

github.com

opencv/opencv_contrib/blob/4.x/modules/freetype/README.md

FreeType2 Wrapper Module
========================

This FreeType2 wrapper module allows to draw strings with outlines and bitmaps.

Requested external libraries
----------------------------

harfbuzz is requested to convert UTF8 to gid(GlyphID).

freetype library is requested to rasterize given gid.

- harfbuzz https://www.freedesktop.org/wiki/Software/HarfBuzz/
- freetype https://www.freetype.org/

Usage
-----

```
cv::Ptr<cv::freetype::FreeType2> ft2;

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please also note, that upcoming opencv 5 will have builtin truetype fonts in imgproc