# syntax=docker/dockerfile:1
#
# Google's woff2 library with brotli, compiled to WebAssembly for
# johnmcm.com's /font-converter (and WOFF2 opening in /font-inspector). Both
# are MIT. The Emscripten image is pinned by version and digest, both
# libraries by commit (see README.md).
#
#   ./build.ps1     (or)   docker build --target export --output type=local,dest=dist .

ARG EMSDK_IMAGE=emscripten/emsdk:6.0.10@sha256:e077d54e2b8970575ebc4f185ac1de0b95c05f2b266134d4ba27449af7aebf65
FROM ${EMSDK_IMAGE} AS build

ARG WOFF2_COMMIT=fb9c3379f2605b10f3e8f1d9636664ab5576775c
# brotli v1.2.0
ARG BROTLI_COMMIT=028fb5a23661f123017c060daa546b55cf4bde29
RUN git clone -q https://github.com/google/woff2 /woff2 \
 && git -C /woff2 checkout -q ${WOFF2_COMMIT} \
 && test "$(git -C /woff2 rev-parse HEAD)" = "${WOFF2_COMMIT}" \
 && git clone -q https://github.com/google/brotli /brotli \
 && git -C /brotli checkout -q ${BROTLI_COMMIT} \
 && test "$(git -C /brotli rev-parse HEAD)" = "${BROTLI_COMMIT}"

WORKDIR /build
COPY src/wrapper.cpp .
RUN mkdir -p /out \
 && W="font glyph normalize table_tags transform variable_length woff2_common woff2_dec woff2_enc woff2_out" \
 && SRCS="wrapper.cpp $(for f in $W; do echo /woff2/src/$f.cc; done) $(ls /brotli/c/common/*.c /brotli/c/dec/*.c /brotli/c/enc/*.c)" \
 && em++ -O3 -fno-exceptions -I/woff2/include -I/brotli/c/include $SRCS -o /out/woff2.mjs \
    -sMODULARIZE=1 -sEXPORT_ES6=1 -sEXPORT_NAME=createWoff2 \
    -sENVIRONMENT=web,worker,node \
    -sALLOW_MEMORY_GROWTH=1 \
    -sMAXIMUM_MEMORY=1073741824 \
    -sFILESYSTEM=0 \
    -sDYNAMIC_EXECUTION=0 \
    -sINCOMING_MODULE_JS_API=print,printErr,locateFile \
    -sEXPORTED_FUNCTIONS=_w2_alloc,_w2_free,_w2_decode,_w2_decoded,_w2_max_encoded_size,_w2_encode \
    -sEXPORTED_RUNTIME_METHODS=HEAPU8,HEAPU32

FROM scratch AS export
COPY --from=build /out/ /