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16 to render images of individual letters (glyph). A font is stored in a
36 to be smoother --- higher bpp values result in smoother edges.
40 The **format** property also affects the amount of memory needed to store a
42 times larger compared to ``format = LV_FONT_GLYPH_FORMAT_A1``.
49 LVGL supports **UTF-8** encoded Unicode characters. Your editor needs to
50 be configured to save your code/text as UTF-8 (usually this the default)
51 and be sure that :c:macro:`LV_TXT_ENC` is set to :c:macro:`LV_TXT_ENC_UTF8` in
54 To test it try
74 written from left to right.
76 Languages like Arabic, Persian, and Hebrew, which use Right-to-Left
81 it is recommended to use the single Unicode format (NFC) rather than decomposing them
132 :cpp:var:`lv_font_montserrat_16` for a 16 px height font. To use them in a
133 style, just add a pointer to a font variable like this:
142 In addition to the ASCII range, the following symbols are also added to
178 Most languages use a Left-to-Right (LTR for short) writing direction,
180 Right-to-Left (RTL for short) direction.
187 BiDi support is enabled by setting :c:macro:`LV_USE_BIDI` to a non-zero value in ``lv_conf.h``.
191 However, in LVGL, the base direction is not only applied to labels. It's
193 will be inherited from the parent. This means it's enough to set the
200 To set a Widget's base direction use :cpp:expr:`lv_obj_set_style_base_dir(widget, base_dir, selecto…
203 - :cpp:enumerator:`LV_BASE_DIR_LTR`: Left to Right base direction
204 - :cpp:enumerator:`LV_BASE_DIR_RTL`: Right to Left base direction
210 - ``lv_tabview``: Displays tabs from right to left
212 - ``lv_buttonmatrix``: Orders buttons from right to left
214 - ``lv_dropdown``: Aligns options to the right
216 ``lv_dropdown``, ``lv_roller`` are "BiDi processed" to be displayed correctly
221 There are some special rules to display Arabic and Persian characters:
223 different form of the same letter needs to be used when it is isolated,
247 - not passing the ``--no-compress`` flag to the offline converter (compression is applied by defaul…
250 it's about 30% slower to render compressed fonts. Therefore, it is
251 recommended to compress only the largest fonts of a user interface,
264 Fonts may provide kerning information to adjust the spacing between specific
273 To configure kerning at runtime, use :cpp:func:`lv_font_set_kerning`.
282 There are several ways to add a new font to your project:
284 1. The simplest method is to use the `Online font converter <https://lvgl.io/tools/fontconverter>`_…
285 Just set the parameters, click the *Convert* button, copy the font to your project
286 and use it. **Be sure to carefully read the steps provided on that site
289 (Requires Node.js to be installed)
290 3. If you want to create something like the built-in
294 https://github.com/lvgl/lv_font_conv/ to be installed.)
296 To declare a font in a file, use :cpp:expr:`LV_FONT_DECLARE(my_font_name)`.
298 To make fonts globally available (like the built-in fonts), add them to
313 3. Set the parameters such as Name, Size, BPP. You'll use this name to
315 4. Add the Unicode ID of the symbol to the range field. E.g.\ ``0xf287``
317 5. Convert the font and copy the generated source code to your project.
318 Make sure to compile the ``.c`` file of your font.
324 1. Convert the Unicode value to UTF8, for example on
331 in the font defined in the style's ``text.font`` property. To use the symbol
332 you will need to set the style's text font to use the generated font, e.g.
341 :cpp:func:`lv_binfont_create` can be used to load a font from a file. The font needs
342 to have a special binary format. (Not TTF or WOFF). Use
344 ``--format bin`` option to generate an LVGL compatible font file.
346 :note: To load a font :ref:`LVGL's filesystem <overview_file_system>`
347 needs to be enabled and a driver must be added.
353 lv_font_t *my_font = lv_binfont_create("X:/path/to/my_font.bin");
366 :cpp:func:`lv_binfont_create_from_buffer` can be used to load a font from a memory buffer.
367 This function may be useful to load a font from an external file system, which is not
368 supported by LVGL. The font needs to be in the same format as if it were loaded from a file.
370 :note: To load a font from a buffer :ref:`LVGL's filesystem <overview_file_system>`
371 needs to be enabled and the MEMFS driver must be added.
397 the solution, but it's necessary to convert the bitmap font (BDF) to a TTF.
399 Convert BDF to TTF
404 in this GitHub repository: https://github.com/Tblue/mkttf . This tool uses potrace to generate ou…
426 But newer versions don't. So you might want to change 2 lines in ``potrace-wrapper.sh`` ---
441 It might be necessary to change the mkttf.py script.
465 To create a font for LVGL:
478 LVGL's font interface is designed to be very flexible but, even so, you
480 example, you can use `FreeType <https://www.freetype.org/>`__ to
481 real-time render glyphs from TTF fonts or use an external flash to store
484 To add a new font engine, a custom :cpp:type:`lv_font_t` variable needs to be created:
490 my_font.get_glyph_dsc = my_get_glyph_dsc_cb; /* Set a callback to get info about glyphs */
491 my_font.get_glyph_bitmap = my_get_glyph_bitmap_cb; /* Set a callback to get bitmap of a glyph */
501 …* The next letter (`unicode_letter_next`) might be used to calculate the width required by this gl…
538 specify a ``fallback`` font to be used in :cpp:type:`lv_font_t`.
540 ``fallback`` can be chained, so it will try to solve until there is no ``fallback`` set.