Feedback usage font converter

[Zaltora]

Hi, i recently used your tools to get a better font and symbol for small display. Impressive tools to get directly a standard ttf to generate any font possible. My remarks: I think we should add more built-in font to match different screen type. I found the "Terminus" which is well suited to small oled screens for example.

I do not think I did the right thing to add a font. I directly modify the files lv_font.c, lv_font.h to integrate my fonts as if they were already included in lvgl. What is the simply way ? Or maybe a user can not just call some "registration function" in this own program ? ( Range / Array / ...)

I noticed that the online tools do not generate the case of non-ASCII characters. I add manually:

#if LV_TXT_UTF8
    .unicode_first = 61440, First Unicode letter in this font * /
    .unicode_last = 62190, Last Unicode letter in this font * /
#else
    .unicode_first = 192, First Unicode letter in this font * /
    .unicode_last = 241, Last Unicode letter in this font * /
#endif

I had a problem when generating my symbols, I had to directly modify the sources at the end of the file from:

    .unicode_list = symbol_unicode_list,    /*List of unicode characters*/
    .get_bitmap = lv_font_get_bitmap_sparse,    /*Function pointer to get glyph's bitmap*/
    .get_width = lv_font_get_width_sparse,  /*Function pointer to get glyph's width*/

to:

    .unicode_list = NULL, / * List of unicode characters * /
    .get_bitmap = lv_font_get_bitmap_continuous, / * Function pointer to get glyph's bitmap * /
    .get_width = lv_font_get_width_continuous, / * Function pointer to get glyph's width * /

Another minor remark. Associate fonts of different size as for example to associate "lv_font_dejavu_20" and "lv_font_symbol_10" will make appear another part of another symbol because fonts files don't get the same pixel height size. Is it worth adding a size control according to the range of fonts registration? e.g: 32-126 => size 14 192-241 => size 18 it is maybe not a necessary upgrade.

Thank you for this tool :)

[kisvegabor]

Hi,

Thank you for the feedback!

Using the generated fonts

There is a short guide on the font converter's page: "How to use the generated fonts in LittlevGL?" Have you tried it?

Symbols

This part

#if LV_TXT_UTF8
    .unicode_first = 61440, First Unicode letter in this font * /
    .unicode_last = 62190, Last Unicode letter in this font * /
#else
    .unicode_first = 192, First Unicode letter in this font * /
    .unicode_last = 241, Last Unicode letter in this font * /
#endif

is a special case because the symbols are located at different locations with and without UTF8 support. As it's a special case the generator doesn't adds it automatically. It's the same with ..unicode_list, .get_bitmap and .get_width.

It seems useful to add checkbox like "Generate symbol font" which could make these changes automatically. What do you think?

[Zaltora]

I see the documentation but i don' no where put my generated files. Tell me if i am right Can be possible to add the font file in my app, then use a lvgl function to register this whitout need to change the font file. or I need just put this in my app LV_FONT_DECLAER(my_font_name) ? That disturb me to see #include "../lv_font.h" into the generated font.

Automatic changes with a button will be great with a warning if is not possible (when too much symbol for ASCII). Maybe add some notes about it too. :)

[kisvegabor]

You can copy it anywhere in you project. You just have to declare it (LV_FONT_DECLAER) where you want to use it. No modification required in the files

That disturb me to see #include "../lv_font.h" into the generated font.

If you generate a built-in font then the converter supposes that you will use it as part of LittelvGL. But for not built-in fonts you should see #include "lvgl/lv_misc/lv_font.h"

Automatic changes with a button will be great with a warning if is not possible (when too much symbol for ASCII). Maybe add some notes about it too. :)

As the mapping of built in symbols is hard coded in lv_symbol_defs.h it is not possible to show warning because if you generate a compatible built-in font than you should use this mapping. But if you use other symbol mapping (not the as in lv_symbol_defs.h) than it's up to you where to place it but then they won't be compatible with the defines in lv_symbol_defs.h.

[stale[bot]]

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[embeddedt]

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