Vendored universal libwebp dylibs

libwebp.7.dylib and libsharpyuv.0.dylib here are universal (arm64 + x86_64) builds of libwebp 1.5.0.

Why they are committed

The release pipeline (codemagic.yaml → omi-desktop-swift-release) builds a universal Omi.app. Homebrew's libwebp on the Codemagic Mac mini m2 runners is arm64-only, which breaks the x86_64 cross-compile link step. The pipeline therefore needs universal libwebp.7.dylib + libsharpyuv.0.dylib to patch over Homebrew's arm64-only copies.

Previously the "Prepare universal libwebp" step compiled libwebp from source for both arches on every release run (~several minutes each run). These prebuilt dylibs are vendored so that step just copies them instead. The from-source build remains as an automatic fallback in codemagic.yaml if these files are missing or not universal — so the pipeline stays fully reproducible from source.

How to rebuild (exactly what the fallback / CI does)

WEBP_VERSION="1.5.0"
TEMP_DIR="$(mktemp -d)"
# version-min flags pin LC_BUILD_VERSION minos to 13.0; CMAKE_OSX_DEPLOYMENT_TARGET
# alone does NOT stick on newer SDKs (they stamp the SDK version, e.g. 26.0, which
# would refuse to load on older macOS). Verify with: otool -l <dylib> | grep -A3 LC_BUILD_VERSION
export MACOSX_DEPLOYMENT_TARGET=13.0
CMAKE_COMMON="-DBUILD_SHARED_LIBS=ON -DCMAKE_BUILD_TYPE=Release \
  -DCMAKE_OSX_DEPLOYMENT_TARGET=13.0 \
  -DCMAKE_C_FLAGS=-mmacosx-version-min=13.0 \
  -DCMAKE_SHARED_LINKER_FLAGS=-mmacosx-version-min=13.0 \
  -DWEBP_BUILD_EXTRAS=OFF -DWEBP_BUILD_ANIM_UTILS=OFF \
  -DWEBP_BUILD_CWEBP=OFF -DWEBP_BUILD_DWEBP=OFF \
  -DWEBP_BUILD_GIF2WEBP=OFF -DWEBP_BUILD_IMG2WEBP=OFF \
  -DWEBP_BUILD_VWEBP=OFF -DWEBP_BUILD_WEBPINFO=OFF \
  -DWEBP_BUILD_WEBPMUX=OFF"
curl -sL "https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-$WEBP_VERSION.tar.gz" | tar xz -C "$TEMP_DIR"
SRC="$TEMP_DIR/libwebp-$WEBP_VERSION"

mkdir "$SRC/build-arm64"  && (cd "$SRC/build-arm64"  && cmake .. -DCMAKE_OSX_ARCHITECTURES=arm64  $CMAKE_COMMON && make -j webp sharpyuv)
mkdir "$SRC/build-x86_64" && (cd "$SRC/build-x86_64" && cmake .. -DCMAKE_OSX_ARCHITECTURES=x86_64 $CMAKE_COMMON && make -j webp sharpyuv)

lipo -create \
  "$(find "$SRC/build-arm64"  -name 'libwebp.7.*.dylib'    -not -type l | head -1)" \
  "$(find "$SRC/build-x86_64" -name 'libwebp.7.*.dylib'    -not -type l | head -1)" \
  -output libwebp.7.dylib
lipo -create \
  "$(find "$SRC/build-arm64"  -name 'libsharpyuv.0.*.dylib' -not -type l | head -1)" \
  "$(find "$SRC/build-x86_64" -name 'libsharpyuv.0.*.dylib' -not -type l | head -1)" \
  -output libsharpyuv.0.dylib

Verify with lipo -info libwebp.7.dylib (expect x86_64 arm64). Both dylibs use @rpath install names, identical to a fresh from-source build.

When bumping the libwebp version, update WEBP_VERSION in codemagic.yaml, rebuild these two files with the steps above, and update this README.