Using an online font conversion problem

How-to
1

Hello:
When I used the online font conversion, when I clicked the conversion button, the page simply refreshed.How to correctly convert fonts?

%E6%8D%95%E8%8E%B7
捕获.PNG1346×689 15 KB

%E6%8D%95%E8%8E%B72
捕获2.PNG1874×896 73.8 KB

Thank you for reply!

2

Hi zlm! Welcome to the community.

I’ve only used the converter one time and I don’t remember having to do anything special. I’m in the US using an English character set - I don’t know if that matters.

I do remember seeing a comment somewhere in the forum that the online converter is not 100% error-proof. Have you tried using the offline version instead?

Sorry I can’t be much more help. You may have to wait for the devs to chime in if you can’t get this to work.

3

It looks like the online font converter didn’t load properly. You can try refreshing the page, or using the offline font converter instead.

4

HI：
Thank you for your reply.I tried the offline font conversion and it worked.I’ve tried this at my company and at home, and online font conversion doesn’t work.
I found a bug when I used label to display fonts(VS2013 simulator).In function
static uint32_t get_glyph_dsc_id(const lv_font_t * font, uint32_t letter),
fdsc->cmaps[i].type = 0xfffffffe,But what I’m actually setting is this LV_FONT_FMT_TXT_CMAP_SPARSE_TINY.
The following:

PNG
捕获21.PNG.jpg993×700 585 KB
%E6%8D%95%E8%8E%B722
捕获22.PNG946×686 1.3 MB

But my actual “type” members are as follows:
%E6%8D%95%E8%8E%B73
捕获3.PNG1080×376 9.75 KB

Finally, I found that “lv_font_fmt_txt_cmap_t” has only 2bit members of “type”:
%E6%8D%95%E8%8E%B74
I think that’s a problem,I modified it in two ways:
%E6%8D%95%E8%8E%B76 %E6%8D%95%E8%8E%B77

After that, the font will display normally.

5

Thanks for the detailed description.
I’ve applied your solution with lv_font_fmt_txt_cmap_type_t type;.

I wonder why it doesn’t cause problems in other places too.

This patter is used in lot of places in the library:

/** Format of font character map. */
enum {
    LV_FONT_FMT_TXT_CMAP_FORMAT0_TINY,
    LV_FONT_FMT_TXT_CMAP_FORMAT0_FULL,
    LV_FONT_FMT_TXT_CMAP_SPARSE_TINY,
    LV_FONT_FMT_TXT_CMAP_SPARSE_FULL,
};

typedef uint8_t lv_font_fmt_txt_cmap_type_t;

So lv_font_fmt_txt_cmap_type_t is unsigned. However, LV_FONT_FMT_TXT_CMAP_... might be treated as signed is Visual Studio, and in
if(fdsc->cmaps[i].type == LV_FONT_FMT_TXT_CMAP_SPARSE_TINY) both might be treated as signed.

6

This may be a different version，This is the case in my current version( lv_sim_visual_studio_sdl (6.0.0) by GitHub in 2019.11.14)：

/* Format of font character map. */
typedef enum {
    LV_FONT_FMT_TXT_CMAP_FORMAT0_TINY,
    LV_FONT_FMT_TXT_CMAP_FORMAT0_FULL,
    LV_FONT_FMT_TXT_CMAP_SPARSE_TINY,
    LV_FONT_FMT_TXT_CMAP_SPARSE_FULL,
}lv_font_fmt_txt_cmap_type_t;

If you use

/* Format of font character map. */
enum {
    LV_FONT_FMT_TXT_CMAP_FORMAT0_TINY,
    LV_FONT_FMT_TXT_CMAP_FORMAT0_FULL,
    LV_FONT_FMT_TXT_CMAP_SPARSE_TINY,
    LV_FONT_FMT_TXT_CMAP_SPARSE_FULL,
};

typedef uint8_t lv_font_fmt_txt_cmap_type_t;

I don’t think you need to modify it,I tried and the new version (lv_font_fmt_txt_cmap_type_t type:2;)is correct,Thank you.

1 Like