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Add infrastructure to build WebAssembly static libs via wasm-vips
Co-authored-by: Ingvar Stepanyan <[email protected]>
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‎.gitignore

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libvips*
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*.log
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build/wasm-vips-*
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deps/
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target/
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npm/*/*
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!npm/*/package.json
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!npm/dev-wasm32/THIRD-PARTY-NOTICES.md
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npm/img-sharp-libvips-*.tgz

‎README.md

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Dependency paths are modified to use the relative `@rpath` with `install_name_tool`.
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### WebAssembly
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The scripts from [wasm-vips](https://github.com/kleisauke/wasm-vips)
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are [used to compile](build/wasm.sh) libvips and its dependencies
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as static Wasm libraries ready for further compilation into a single,
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statically-linked sharp shared library.
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## Licences
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These scripts are licensed under the terms of the [Apache 2.0 Licence](LICENSE).

‎build/wasm.sh

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#!/usr/bin/env bash
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set -e
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VERSION_WASM_VIPS="56f151b"
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DIR="wasm-vips-${VERSION_WASM_VIPS}"
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TAG="wasm-vips:${VERSION_WASM_VIPS}"
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echo "Using ${TAG}"
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cd "${0%/*}"
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if [ ! -d "$DIR" ]; then
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# Download specific version of wasm-vips
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mkdir "${DIR}"
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curl -Ls https://github.com/kleisauke/wasm-vips/archive/${VERSION_WASM_VIPS}.tar.gz | tar xzC "${DIR}" --strip-components=1
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fi
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if [ -z "$(docker images -q ${TAG})" ]; then
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# Create container with emscripten
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pushd "${DIR}"
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docker build -t "${TAG}" .
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popd
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fi
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if [ ! -d "$DIR/build/target/lib" ]; then
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# Build libvips and dependencies as static Wasm libraries via emscripten
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docker run --rm -v "$PWD/${DIR}":/src "${TAG}" -c "./build.sh --disable-bindings --disable-modules --disable-jxl --enable-libvips-cpp"
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fi
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# Copy only the files we need
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cp -r --no-preserve=mode,ownership ${DIR}/build/target/{include,lib,versions.json} ../npm/dev-wasm32
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rm -r ../npm/dev-wasm32/lib/cmake

‎npm/dev-wasm32/THIRD-PARTY-NOTICES.md

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# Third-party notices
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This software contains third-party libraries
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used under the terms of the following licences:
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| Library | Used under the terms of |
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|---------------|-----------------------------------------------------------------------------------------------------------|
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| aom | BSD 2-Clause + [Alliance for Open Media Patent License 1.0](https://aomedia.org/license/patent-license/) |
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| cgif | MIT Licence |
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| expat | MIT Licence |
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| glib | LGPLv3 |
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| highway | Apache-2.0 License, BSD 3-Clause |
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| lcms | MIT Licence |
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| libexif | LGPLv3 |
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| libffi | MIT Licence |
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| libheif | LGPLv3 |
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| libimagequant | [BSD 2-Clause](https://github.com/lovell/libimagequant/blob/main/COPYRIGHT) |
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| mozjpeg | [zlib License, IJG License, BSD-3-Clause](https://github.com/mozilla/mozjpeg/blob/master/LICENSE.md) |
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| libnsgif | MIT Licence |
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| libspng | [BSD 2-Clause, libpng License](https://github.com/randy408/libspng/blob/master/LICENSE) |
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| libtiff | [libtiff License](https://gitlab.com/libtiff/libtiff/blob/master/LICENSE.md) (BSD-like) |
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| libvips | LGPLv3 |
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| libwebp | New BSD License |
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| resvg | MPL-2.0 License |
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| zlib-ng | [zlib Licence](https://github.com/zlib-ng/zlib-ng/blob/develop/LICENSE.md) |
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Use of libraries under the terms of the LGPLv3 is via the
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"any later version" clause of the LGPLv2 or LGPLv2.1.
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Please report any errors or omissions via
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https://github.com/lovell/sharp-libvips/issues/new

‎npm/dev-wasm32/package.json

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{
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"name": "@img/sharp-libvips-dev-wasm32",
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"version": "0.0.3",
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"description": "Header files and static wasm32 libraries for libvips and dependencies to build sharp as wasm32",
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"author": "Lovell Fuller <[email protected]>",
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"homepage": "https://sharp.pixelplumbing.com",
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"repository": {
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"type": "git",
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"url": "git+https://github.com/lovell/sharp-libvips.git",
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"directory": "npm/dev-wasm32"
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},
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"license": "LGPL-3.0-or-later",
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"funding": {
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"url": "https://opencollective.com/libvips"
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},
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"preferUnplugged": true,
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"publishConfig": {
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"access": "public"
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},
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"files": [
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"include",
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"lib",
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"versions.json"
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],
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"type": "commonjs",
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"exports": {
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"./include": "./include/index.js",
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"./lib": "./lib/index.js",
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"./versions": "./versions.json"
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}
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}

‎npm/package.json

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"private": "true",
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"workspaces": [
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"dev",
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"dev-wasm32",
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"darwin-x64",
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"darwin-arm64",
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"linux-arm",

‎npm/populate.sh

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remove_unused() {
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PACKAGE="$1"
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if [ "$PACKAGE" != "dev" ]; then
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if [[ "$PACKAGE" != "dev"* ]]; then
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rm -r "npm/$PACKAGE/include"
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rm "npm/$PACKAGE/THIRD-PARTY-NOTICES.md"
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fi
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rm "npm/$PACKAGE/THIRD-PARTY-NOTICES.md"
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}
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# Download and extract per-platform binaries

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