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.. _libpng:
==============
libpng decoder
==============
libpng is the official PNG reference library. It supports almost all PNG features, is extensible, and has been extensively tested for over 28 years.
Detailed introduction: http://www.libpng.org/pub/png/libpng.html
Install
-------
.. code:: bash
sudo apt install libpng-dev
Add libpng to your project
--------------------------
.. code:: cmake
find_package(PNG REQUIRED)
include_directories(${PNG_INCLUDE_DIR})
target_link_libraries(${PROJECT_NAME} PRIVATE ${PNG_LIBRARIES})
.. _libpng_usage:
Usage
-----
Enable :c:macro:`LV_USE_LIBPNG` in ``lv_conf.h``.
See the examples below.
It should be noted that each image of this decoder needs to consume ``width x height x 4`` bytes of RAM,
and it needs to be combined with the :ref:`overview_image_caching` feature to ensure that the memory usage is within a reasonable range.
The decoded image is stored in RGBA pixel format.
.. _libpng_example:
Example
-------
.. include:: ../examples/libs/libpng/index.rst
.. _libpng_api:
API
---
:ref:`libpng`
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