zig-openexr-core

Zig build system for OpenEXR Core - the pure C API for reading and writing OpenEXR files.

NOTE: This build system conversion from CMake to Zig involved significant AI/LLM assistance. Please review build.zig to verify correctness for your use case.

Features

• Pure C API - No C++ dependencies, suitable for FFI/bindings
• Full compression support - ZIP, ZIPS, RLE, PIZ, PXR24, B44, DWA
• F16C SIMD acceleration - Hardware half-float conversion on x86_64
• Cross-platform - Builds with Zig's cross-compilation support

Building

# Debug build
zig build

# Release build
zig build -Doptimize=ReleaseFast

# Cross-compile example
zig build -Dtarget=x86_64-linux-musl -Doptimize=ReleaseFast

Output

• zig-out/lib/libopenexr.a - Static library (includes libdeflate)
• zig-out/include/OpenEXR/ - OpenEXR Core headers

Limitations

• JPEG-HT compression - Returns EXR_ERR_FEATURE_NOT_IMPLEMENTED (requires OpenJPH C++ library)

Dependencies

All dependencies are fetched automatically via Zig's package manager:

Dependency	Version	License
OpenEXR	3.4.4	BSD-3-Clause
libdeflate	1.23	MIT
Imath	3.2.1	BSD-3-Clause

License

• Build scripts (build.zig, build.zig.zon, config headers): MIT
• OpenEXR and Imath: BSD-3-Clause
• libdeflate: MIT