Does anyone know how to let the flag LV_FREETYPE_FONT_STYLE_BOLD work?

sliang951753 · September 13, 2025, 9:29am

I’m using lvgl freetype extension. When I create font and specify the flag LV_FREETYPE_FONT_STYLE_BOLD, it won’t display as bold style, still regular style .

Is there any example to show how to use this flag?

halyssonJr · March 21, 2026, 5:37pm

@sliang951753 ,Thank you for your message. I found a stress test using the LV_FREETYPE_FONT_STYLE_BOLD option. If you have any problems, I can create an example using this option.

github.com

lvgl/lvgl/blob/05cc9aa6af4cdb82d58f154a154007d4d786cafb/tests/src/test_cases/libs/test_font_stress.c#L81-L115


      
          static lv_obj_t * font_stress_label_create(font_stress_ctx_t * ctx, const char * font_name, lv_obj_t * par, int size,
                                                     int x, int y)
          {
              static const uint16_t font_style[] = {
                  LV_FREETYPE_FONT_STYLE_NORMAL,
                  LV_FREETYPE_FONT_STYLE_ITALIC,
                  LV_FREETYPE_FONT_STYLE_BOLD,
              };
          
              uint32_t index = lv_rand(0, sizeof(font_style) / sizeof(uint16_t) - 1);
              uint32_t r = lv_rand(0, 0xFF);
              uint32_t g = lv_rand(0, 0xFF);
              uint32_t b = lv_rand(0, 0xFF);
              lv_opa_t opa = lv_rand(0, LV_OPA_COVER);
              lv_color_t color = lv_color_make(r, g, b);
          
              lv_font_t * font = ctx->font_create_cb(ctx, font_name, LV_FREETYPE_FONT_RENDER_MODE_BITMAP, size, font_style[index]);
              if(!font) {
                  return NULL;
              }

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