VG-Lite Simulator

LVGL integrates a VG-Lite simulator based on ThorVG. Its purpose is to simplify the debugging of VG-Lite adaptation and reduce the time of debugging and locating problems on hardware devices.

It has been integrated into the CI automated compilation and testing process to ensure that the VG-Lite rendering backend can be fully tested after each PR modification.

How It Works

Sort out the APIs in the vg_lite.h header file provided by the vendor, re-implement the APIs using ThorVG, and simulate the same rendering images as the real hardware on the simulator.

Configuration

  1. Enable VG-Lite rendering backend, see VG-Lite General GPU.

  2. Enable ThorVG and turn on the configuration LV_USE_THORVG_INTERNAL or LV_USE_THORVG_EXTERNAL. It is recommended to use the internal ThorVG library to ensure uniform rendering results.

  3. Enable LV_USE_VG_LITE_THORVG and set LV_DRAW_BUF_ALIGN to 64. The rest of the options can remain default. Make sure LV_VG_LITE_USE_GPU_INIT is enabled, because the thorvg drawing context needs to be initialized before it can be used.