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feat(tiny_ttf): ttf support (#3680)

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Co-authored-by: embeddedt <42941056+embeddedt@users.noreply.github.com>
Co-authored-by: Gabor Kiss-Vamosi <kisvegabor@gmail.com>
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honey the codewitch
2022-09-26 08:30:07 -07:00
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# Tiny TTF font engine
## Usage
Allow using TrueType fonts LVGL. Based on https://github.com/nothings/stb
When enabled in `lv_conf.h` with `LV_USE_TINY_TTF` `lv_tiny_ttf_create_data(data, data_size, line_height)` can be used to create a TTF font instance at the specified line height. You can then use that font anywhere `lv_font_t` is accepted.
By default, the TTF or OTF file must be embedded as an array, either in a header, or loaded into RAM in order to function.
However, if `LV_TINY_TTF_FILE_SUPPORT` is enabled, `lv_tiny_ttf_create_file(path, line_height)` will also be available, allowing tiny_ttf to stream from a file. The file must remain open the entire time the font is being used.
After a font is created, you can change the size by using `lv_tiny_ttf_set_size(font, line_height)`.
## Example
```eval_rst
.. include:: ../../examples/libs/tiny_ttf/index.rst
```
## API
```eval_rst
.. doxygenfile:: lv_tiny_ttf.h
:project: lvgl