第三方库支持

选择 freetype 包，在 Luban 根目录下执行 make menuconfig，进入 menuconfig

ArtInChip Luban SDK Configuration  --->
    Third-party packages  --->
    [*] freetype  --->

目录 lvgl-ui/lvgl/examples/libs/freetype/lv_example_freetype_1.c 下示例调用

在 h 头文件中打开宏定义

#define LV_USE_FREETYPE 1
#define LV_BUILD_EXAMPLES 1

修改 c 中的入口函数：

/*Create a Demo*/
#if LV_USE_DEMO_MUSIC == 1
    void lv_demo_music(void);
    lv_demo_music();
#else
    //void base_ui_init();
    //base_ui_init();
    void lv_example_freetype_1(void);
    lv_example_freetype_1();
#endif

设置 lvgl-ui/lvgl/examples/libs/freetype/Lato-Regular.ttf 字体的打包目录，复制字体到 lvgl-ui/base_ui/asserts/font 目录下，则会把字体打包到系统目录/usr/local/share/lvgl_data/font 目录下

修改代码 c 中字体文件路径

void lv_example_freetype_1(void)
{
    /*Create a font*/
    static lv_ft_info_t info;
    /*FreeType uses C standard file system, so no driver letter is required.*/
    //info.name = "./lvgl/examples/libs/freetype/Lato-Regular.ttf";
    info.name = "/usr/local/share/lvgl_data/font/Lato-Regular.ttf";
    info.weight = 24;
    info.style = FT_FONT_STYLE_NORMAL;
    info.mem = NULL;
    if(!lv_ft_font_init(&info)) {
        LV_LOG_ERROR("create failed.");
    }

    /*Create style with the new font*/
    static lv_style_t style;
    lv_style_init(&style);
    lv_style_set_text_font(&style, info.font);
    lv_style_set_text_align(&style, LV_TEXT_ALIGN_CENTER);

    /*Create a label with the new style*/
    lv_obj_t * label = lv_label_create(lv_scr_act());
    lv_obj_add_style(label, &style, 0);
    lv_label_set_text(label, "Hello world\nI'm a font created with FreeType");
    lv_obj_center(label);
}