Emscripten port

LVGL ported to Emscripten to be converted to JavaScript

The result looks like this https://lvgl.io/demos

How to get started

Install SDL

Downlad SDL (a graphics library to ope na window and handle the mouse). On Linux:

1. Find the current version of SDL2: apt-cache search libsdl2 (e.g. libsdl2-2.0-0)
2. Install SDL2: sudo apt-get install libsdl2-2.0-0 (replace with the found version)
3. Install SDL2 development package: sudo apt-get install libsdl2-dev
4. If build essentials are not installed yet: sudo apt-get install build-essential

Install Emscripten SDK

Download the Emscripten SDK and make sure it is in your PATH.

1. git clone https://github.com/emscripten-core/emsdk.git
2. cd <path-to-emsdk>
3. git pull
4. ./emsdk install latest
5. ./emsdk activate latest
6. source ./emsdk_env.sh

More info here: https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html

Get the Emscripten-LVGL project

1. Be sure you ran . <path-to-emsdk>/emsdk_env.sh to add EMSDK to PATH
2. In any directoy: git clone --recursive https://github.com/lvgl/lv_web_emscripten.git
3. cd <path-to-emscripten>
4. mkdir cmbuild
5. cd cmbuild
6. emcmake cmake ..
7. emmake make -j4
8. A file called index.html will be generated. Run this in your browser.

Build options (environment variables)

• LVGL_CHOSEN_DEMO can be set to the desired demo name so that you don't need to change any C files. This is useful to compile many demos in bulk using a script.

Example emcmake cmake .. -DLVGL_CHOSEN_DEMO=lv_demo_widgets

Known issue with Google Chrome browser

Chrome can't open the generated html file offline. It works if you copy the files to a server. Use Firefox or other browser for offline testing.

Known issue with Firefox

Firefox can't open the generated html file offline unless you go to about:config and change privacy.file_unique_origin to false.