luban-lite-t3e-pro/packages/third-party/lvgl/lvgl-8.3.2/docs/libs/png.md

PNG decoder

Allow the use of PNG images in LVGL. This implementation uses lodepng library.

If enabled in lv_conf.h by LV_USE_PNG LVGL will register a new image decoder automatically so PNG files can be directly used as any other image sources.

Note that, a file system driver needs to registered to open images from files. Read more about it here or just enable one in lv_conf.h with LV_USE_FS_...

The whole PNG image is decoded so during decoding RAM equals to image width x image height x 4 bytes are required.

As it might take significant time to decode PNG images LVGL's images caching feature can be useful.

Example

.. include:: ../../examples/libs/png/index.rst

API

.. doxygenfile:: lv_png.h
  :project: lvgl