Add lvgl

[MeteorsLiu]

How to generate lvgl

Environment requirement

llcppg: v0.7.0
llgo: greater than v0.11.5
llvm: 19

Software requirement

sdl2

1. Copy and edit lv_conf.h

cd lvgl
cp lv_conf_template.h lv_conf.h

Edit lv_conf.h,

1. Enable content

#if 1 /* Set this to "1" to enable content */

2. Enable sdl2

/** Use SDL to open window on PC and handle mouse and keyboard. */
#define LV_USE_SDL              1

2. Build LVGL

mkdir build && cd build
cmake  -DCMAKE_CXX_FLAGS=$(pkg-config --cflags sdl2) -DCMAKE_C_FLAGS=$(pkg-config --cflags sdl2) ..
cmake --build .

3. Add pkgconfig

includedir="{{lvgl source path}}"
libdir="${includedir}/build/lib"

Name: lvgl
Description: Light and Versatile Graphics Library
URL: https://lvgl.io/
Version: 9.3.0
Cflags: -I${includedir}
Libs: -L${libdir} -llvgl

And activate it, export PKG_CONFIG_PATH=$(pwd):$PKG_CONFIG_PATH

4. Generate llcppg.cfg

llcppcfg -excludes "tests demos src examples build libs env_support" lvgl

5. Edit llcppg.cfg

lvgl requires external sdl2 and enable llcppg static lib mode.

"libs": "$(pkg-config --libs lvgl sdl2)",
"staticLib": true

6. Generate with llcppg

llcppg -mod github.com/goplus/llpkg/lvgl