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Co-authored-by: Kevin Schlosser <kdschlosser@users.noreply.github.com> Co-authored-by: Liam <30486941+liamHowatt@users.noreply.github.com>
122 lines
3.5 KiB
ReStructuredText
122 lines
3.5 KiB
ReStructuredText
.. _freetype:
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================
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FreeType support
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================
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Interface to FreeType library to generate font bitmap at run time.
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Detailed introduction: https://www.freetype.org
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Add FreeType to your project
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----------------------------
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First, Download FreeType from `here <https://sourceforge.net/projects/freetype/files/>`__.
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There are two ways to use FreeType:
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For UNIX
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~~~~~~~~
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For UNIX systems, it is recommended to use the way of compiling and installing libraries.
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- Enter the FreeType source code directory
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- ``make``
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- ``sudo make install``
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- Add include path: ``/usr/include/freetype2`` (for GCC: ``-I/usr/include/freetype2 -L/usr/local/lib``)
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- Link library: ``freetype`` (for GCC: ``-L/usr/local/lib -lfreetype``)
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For Embedded Devices
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~~~~~~~~~~~~~~~~~~~~
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For embedded devices, it is more recommended to use the FreeType
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configuration file provided by LVGL, which only includes the most
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commonly used functions, which is very meaningful for saving limited
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FLASH space.
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- Copy the FreeType source code to your project directory.
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- Refer to the following ``Makefile`` for configuration:
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.. code-block:: make
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# FreeType custom configuration header file
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CFLAGS += -DFT2_BUILD_LIBRARY
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CFLAGS += -DFT_CONFIG_MODULES_H=<lvgl/src/libs/freetype/ftmodule.h>
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CFLAGS += -DFT_CONFIG_OPTIONS_H=<lvgl/src/libs/freetype/ftoption.h>
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# FreeType include path
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CFLAGS += -Ifreetype/include
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# FreeType C source file
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FT_CSRCS += freetype/src/base/ftbase.c
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FT_CSRCS += freetype/src/base/ftbitmap.c
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FT_CSRCS += freetype/src/base/ftdebug.c
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FT_CSRCS += freetype/src/base/ftglyph.c
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FT_CSRCS += freetype/src/base/ftinit.c
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FT_CSRCS += freetype/src/cache/ftcache.c
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FT_CSRCS += freetype/src/gzip/ftgzip.c
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FT_CSRCS += freetype/src/sfnt/sfnt.c
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FT_CSRCS += freetype/src/smooth/smooth.c
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FT_CSRCS += freetype/src/truetype/truetype.c
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CSRCS += $(FT_CSRCS)
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.. _freetype_usage:
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Usage
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-----
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Enable :c:macro:`LV_USE_FREETYPE` in ``lv_conf.h``.
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Cache configuration:
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- :c:macro:`LV_FREETYPE_CACHE_FT_GLYPH_CNT` Maximum number of cached glyphs., etc.
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By default, the FreeType extension doesn't use LVGL's file system. You
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can simply pass the path to the font as usual on your operating system
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or platform.
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If you want FreeType to use lvgl's memory allocation and file system
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interface, you can enable :c:macro:`LV_FREETYPE_USE_LVGL_PORT` in
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``lv_conf.h``, convenient for unified management.
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The font style supports *Italic* and **Bold** fonts processed by
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software, and can be set with reference to the following values:
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- :cpp:enumerator:`LV_FREETYPE_FONT_STYLE_NORMAL`: Default style.
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- :cpp:enumerator:`LV_FREETYPE_FONT_STYLE_ITALIC`: Italic style.
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- :cpp:enumerator:`LV_FREETYPE_FONT_STYLE_BOLD`: Bold style.
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They can be combined.eg:
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:cpp:expr:`LV_FREETYPE_FONT_STYLE_BOLD | LV_FREETYPE_FONT_STYLE_ITALIC`.
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The FreeType extension also supports colored bitmap glyphs such as emojis. Note
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that only bitmaps are supported at this time. Colored vector graphics cannot be
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rendered. An example on how to draw a colored bitmap glyph is shown below.
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Use the :cpp:func:`lv_freetype_font_create` function to create a font. To
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delete a font, use :cpp:func:`lv_freetype_font_delete`. For more detailed usage,
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please refer to example code.
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.. _freetype_example:
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Examples
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--------
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.. include:: ../examples/libs/freetype/index.rst
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Learn more
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----------
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- FreeType`tutorial <https://www.freetype.org/freetype2/docs/tutorial/step1.html>`__
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- LVGL's :ref:`add_font`
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.. _freetype_api:
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API
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---
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:ref:`ftoption_h`
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:ref:`ftmodule_h`
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