This patch enables UTF-8 support in cjxl, djxl, cjpegli, djpegli, jxlinfo on Windows.

• Download patched pre-builds
• Just the patch
• Full compilation guide

cd libjxl/
wget https://raw.githubusercontent.com/JacobDev1/libjxl-utf8/main/utf8_0.10.2.patch
git apply utf8_0.10.2.patch

Compatible with libjxl 0.10.2

Install MSYS2 and launch MSYS2 MINGW64

Synchronize packages

pacman -Syu

MSYS2 will close, open it again, and install the packages

pacman -S --needed git base-devel mingw-w64-x86_64-toolchain mingw-w64-x86_64-cmake mingw-w64-x86_64-ninja mingw-w64-x86_64-gtest mingw-w64-x86_64-giflib mingw-w64-x86_64-libpng mingw-w64-x86_64-libjpeg-turbo

Clone and enter the repo

git clone --depth 1 -b v0.10.2 https://github.com/libjxl/libjxl
cd libjxl/

Download and apply the patch

wget https://raw.githubusercontent.com/JacobDev1/libjxl-utf8/main/utf8_0.10.2.patch
git apply utf8_0.10.2.patch

Download dependencies

./deps.sh

Generate a makefile

mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=OFF -DBUILD_SHARED_LIBS=OFF -DJPEGXL_ENABLE_BENCHMARK=OFF -DJPEGXL_ENABLE_PLUGINS=ON -DJPEGXL_ENABLE_MANPAGES=OFF -DJPEGXL_FORCE_SYSTEM_BROTLI=ON -DJPEGXL_FORCE_SYSTEM_GTEST=ON ..

Build

cmake --build .

You will find the tools in libjxl/build/tools/.

To run them outside of MSYS2, you need to include the necessary DLLs in the same folder.

1. Make a new folder anywhere, let's call it libjxl-tools
2. Copy the EXEs from C:/msys64/home/user/libjxl/build/tools/ to libjxl-tools
3. Copy the DLLs mentioned below from C:/msys64/mingw64/bin/ into libjxl-tools

• zlib1.dll
• libwinpthread-1.dll
• libstdc++-6.dll
• libpng16-16.dll
• libjpeg-8.dll
• libgif-7.dll
• libgcc_s_seh-1.dll
• libbrotlienc.dll
• libbrotlidec.dll
• libbrotlicommon.dll

4. Click on cjxl.exe in libjxl-tools. If you get DLL errors, also include those DLLs.

Import cjxl.exe into a dependency walker. Any DLL not linked to system32 needs to be copied over from C:/msys64/mingw64/bin/.

• How libavif added UTF-8 support