Get string width in pixels

How-to
1

Given a font and text string in UTF-8 (can be a bidi string), how do I find the string width in pixels?

Thanks.

2

I used this code but did not work:

    _lv_txt_ap_proc(my_str, ctx_str);
    width = _lv_txt_get_width(ctx_str, _lv_txt_get_encoded_length(ctx_str), my_font, 0, 0);
3

It looks that lv_txt_get_width handles only the utf8 character code. While _lv_txt_ap_proc converts it to its contextual code that’s suitable for display (contextual analysis may change letter shape and consequently changes the width).

If I comment _lv_txt_ap_proc I will get an approximate width but not exact.

4

Here is the correct way to find text width in pixels

    lv_point_t p;
    _lv_txt_ap_proc(my_str, ctx_text);
    _lv_txt_get_size(&p, ctxi_text, my_font, 0, 0, LV_COORD_MAX, LV_TXT_FLAG_EXPAND);

p.x contains the total width in pixels.

LVGL contains a lot of good resources, but need to dig.

Excellent work.