build-libwebp.yml

name: Build libwebp

on:
  push:
    paths:
      - '.github/workflows/build-libwebp.yml'
  workflow_dispatch:
    inputs:
      libwebp_version:
        description: 'libwebp version tag (e.g. v1.6.0)'
        required: false
        default: 'v1.6.0'

env:
  LIBWEBP_VERSION: ${{ inputs.libwebp_version || 'v1.6.0' }}

jobs:
  build:
    strategy:
      fail-fast: false
      matrix:
        include:
          - os: ubuntu-latest
            target: linux
            artifact: libwebp.so
          - os: windows-latest
            target: windows
            artifact: libwebp.dll
          - os: macos-latest
            target: macos
            artifact: libwebp.dylib

    name: ${{ matrix.target }}
    runs-on: ${{ matrix.os }}

    steps:
      - uses: actions/checkout@v6

      - name: Clone libwebp
        run: git clone --depth 1 --branch ${{ env.LIBWEBP_VERSION }} https://chromium.googlesource.com/webm/libwebp

      - name: Patch out decoder
        shell: bash
        run: |
          cd libwebp
          sed -i.bak 's/\$<TARGET_OBJECTS:webpdecode>//' CMakeLists.txt
          sed -i.bak 's/add_library(sharpyuv /add_library(sharpyuv STATIC /' CMakeLists.txt

      - name: Create export lists
        shell: bash
        run: |
          cat > libwebp-exports.txt <<'EOF'
          { global: WebPEncodeLosslessBGRA; WebPFree; local: *; };
          EOF
          cat > libwebp-exports-macos.txt <<'EOF'
          _WebPEncodeLosslessBGRA
          _WebPFree
          EOF
          cat > libwebp-exports.def <<'EOF'
          EXPORTS
              WebPEncodeLosslessBGRA
              WebPFree
          EOF

      - name: Build (Unix)
        if: runner.os != 'Windows'
        run: |
          cd libwebp
          mkdir build && cd build

          if [ "${{ matrix.target }}" = "macos" ]; then
            EXTRA_FLAGS="-DCMAKE_OSX_ARCHITECTURES=arm64 -DCMAKE_SHARED_LINKER_FLAGS=-Wl,-exported_symbols_list,${{ github.workspace }}/libwebp-exports-macos.txt,-dead_strip"
          else
            EXTRA_FLAGS="-DCMAKE_SHARED_LINKER_FLAGS=-Wl,--version-script=${{ github.workspace }}/libwebp-exports.txt,--gc-sections"
          fi

          cmake .. \
            -DCMAKE_BUILD_TYPE=MinSizeRel \
            -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON \
            -DCMAKE_C_FLAGS="-ffunction-sections -fdata-sections -fvisibility=hidden -fno-asynchronous-unwind-tables" \
            -DBUILD_SHARED_LIBS=ON \
            -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 \
            -DWEBP_BUILD_EXTRAS=OFF \
            $EXTRA_FLAGS
          cmake --build . --target webp --config MinSizeRel
          if [ "${{ matrix.target }}" = "macos" ]; then
            strip -x libwebp.* 2>/dev/null || true
          else
            strip -s libwebp.* 2>/dev/null || true
          fi

      - name: Build (Windows)
        if: runner.os == 'Windows'
        run: |
          cd libwebp
          mkdir build && cd build
          cmake .. `
            -DCMAKE_BUILD_TYPE=MinSizeRel `
            -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON `
            -DCMAKE_C_FLAGS="/Gw /DWEBP_EXTERN=extern" `
            -DBUILD_SHARED_LIBS=ON `
            -DCMAKE_SHARED_LINKER_FLAGS="/DEF:${{ github.workspace }}/libwebp-exports.def /OPT:REF,ICF" `
            -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 `
            -DWEBP_BUILD_EXTRAS=OFF
          cmake --build . --target webp --config MinSizeRel

      - name: Copy artifact
        shell: bash
        run: |
          mkdir -p output
          if [ "${{ matrix.target }}" = "windows" ]; then
            cp libwebp/build/MinSizeRel/${{ matrix.artifact }} output/
          else
            cp libwebp/build/${{ matrix.artifact }} output/
          fi

      - name: Upload artifact
        uses: actions/upload-artifact@v7
        with:
          name: libwebp-${{ matrix.target }}
          path: output/${{ matrix.artifact }}

  commit:
    needs: build
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - uses: actions/checkout@v6

      - name: Download all artifacts
        uses: actions/download-artifact@v8
        with:
          path: artifacts

      - name: Place natives
        run: |
          mkdir -p webp/src/main/resources/natives/{linux,windows,macos}
          cp artifacts/libwebp-linux/libwebp.so webp/src/main/resources/natives/linux/
          cp artifacts/libwebp-windows/libwebp.dll webp/src/main/resources/natives/windows/
          cp artifacts/libwebp-macos/libwebp.dylib webp/src/main/resources/natives/macos/

      - name: Commit
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git add webp/src/main/resources/natives/
          git diff --cached --quiet && echo "No changes" && exit 0
          git commit -m "Update bundled libwebp ${{ env.LIBWEBP_VERSION }}"
          git push