Add SimpleITK (and libitk dependency) for emscripten-wasm32

recipes/recipes_emscripten/libitk/build.sh

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+#!/bin/bash
+set -e
+
+mkdir -p build
+cd build
+
+emcmake cmake ${CMAKE_ARGS} \
+    -GNinja \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_INSTALL_PREFIX=$PREFIX \
+    -DCMAKE_INSTALL_LIBDIR=lib \
+    -DCMAKE_FIND_ROOT_PATH=$PREFIX \
+    -DBUILD_SHARED_LIBS=OFF \
+    -DBUILD_TESTING=OFF \
+    -DBUILD_EXAMPLES=OFF \
+    -DITK_USE_GPU=OFF \
+    -DITK_DEFAULT_THREADER=Platform \
+    -DITK_USE_PTHREADS=OFF \
+    -DITK_USE_OPENMP=OFF \
+    -DModule_ITKTBBImageToImageFilter=OFF \
+    -DITK_USE_FFTWD=OFF \
+    -DITK_USE_FFTWF=OFF \
+    -DITK_USE_SYSTEM_FFTW=OFF \
+    -DITK_DYNAMIC_LOADING=OFF \
+    -DITK_USE_SYSTEM_EXPAT=ON \
+    -DITK_USE_SYSTEM_JPEG=ON \
+    -DITK_USE_SYSTEM_PNG=ON \
+    -DITK_USE_SYSTEM_TIFF=ON \
+    -DITK_USE_SYSTEM_ZLIB=ON \
+    -DITK_USE_SYSTEM_EIGEN=ON \
+    -DITK_BUILD_DEFAULT_MODULES=ON \
+    -DModule_ITKReview=ON \
+    -DModule_ITKTBB=OFF \
+    -DModule_ITKHDF5=OFF \
+    -DModule_ITKIOHDF5=OFF \
+    -DModule_ITKIOTransformHDF5=OFF \
+    -DModule_ITKIOTransformFactory=OFF \
+    -DITK_FORBID_DOWNLOADS=ON \
+    "${SRC_DIR}"
+
+ninja -j${CPU_COUNT}
+ninja install

recipes/recipes_emscripten/libitk/recipe.yaml

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+context:
+  name: libitk
+  version: "5.4.6"
+
+package:
+  name: ${{ name }}
+  version: ${{ version }}
+
+source:
+- url: https://github.com/InsightSoftwareConsortium/ITK/archive/v${{ version }}.tar.gz
+  sha256: cf28bc7220c57c24ebcbabbd3b2544ea7ab65f0aad430a99f8e157738ed812b7
+
+build:
+  number: 0
+
+requirements:
+  build:
+  - ${{ compiler('c') }}
+  - ${{ compiler('cxx') }}
+  - cmake
+  - ninja
+  host:
+  - expat
+  - libjpeg-turbo
+  - libpng
+  - libtiff
+  - eigen
+  - zlib
+
+tests:
+- package_contents:
+    files:
+    - include/ITK-5.4/itkImage.h
+    - lib/libITKCommon-5.4.a
+
+about:
+  homepage: https://www.itk.org/
+  license: Apache-2.0
+  license_file: LICENSE
+  summary: ITK is an open-source toolkit for multidimensional image analysis
+  description: |
+    The Insight Toolkit (ITK) is an open-source, cross-platform system that
+    provides developers with an extensive suite of software tools for image
+    analysis. Developed through extreme programming methodologies, ITK employs
+    leading-edge algorithms for registering and segmenting multidimensional data.
+  repository: https://github.com/InsightSoftwareConsortium/ITK
+
+extra:
+  recipe-maintainers:
+  - Copilot

recipes/recipes_emscripten/simpleitk/build.sh

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+#!/bin/bash
+set -e
+
+# Step 1: Build SimpleITK C++ library (without Python wrapping)
+# Use CMAKE_ARGS from emscripten environment (set up by emscripten_emscripten-wasm32)
+# but strip the Python flags that cross-python adds, as they are not needed here
+mkdir -p build_cpp
+cd build_cpp
+
+cmake ${CMAKE_ARGS} \
+    -GNinja \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_INSTALL_PREFIX="${PREFIX}" \
+    -DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY \
+    -DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=ONLY \
+    -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ONLY \
+    -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER \
+    -DBUILD_SHARED_LIBS=OFF \
+    -DBUILD_TESTING=OFF \
+    -DBUILD_EXAMPLES=OFF \
+    -DSimpleITK_BUILD_DISTRIBUTE=ON \
+    -DWRAP_DEFAULT=OFF \
+    "${SRC_DIR}"
+
+ninja -j${CPU_COUNT}
+ninja install
+
+cd ..
+
+# Step 2: Build the Python wrapper
+# CMAKE_ARGS now also contains Python-related flags added by cross-python
+mkdir -p build_python
+cd build_python
+
+cmake ${CMAKE_ARGS} \
+    -GNinja \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY \
+    -DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=ONLY \
+    -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ONLY \
+    -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER \
+    -DCMAKE_PROJECT_INCLUDE="${RECIPE_DIR}/overwriteProp.cmake" \
+    -DSimpleITK_BUILD_DISTRIBUTE=ON \
+    -DSimpleITK_PYTHON_THREADS=OFF \
+    -DSimpleITK_PYTHON_USE_VIRTUALENV=OFF \
+    -DSimpleITK_PYTHON_USE_LIMITED_API=OFF \
+    -DPython_EXECUTABLE="${PYTHON}" \
+    -DSWIG_EXECUTABLE="$(which swig)" \
+    "${SRC_DIR}/Wrapping/Python"
+
+ninja -j${CPU_COUNT}
+
+# Install the Python package
+"${PYTHON}" -m pip install . ${PIP_ARGS}

recipes/recipes_emscripten/simpleitk/overwriteProp.cmake

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+set_property(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS TRUE)
+set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-s WASM_BIGINT -s SIDE_MODULE=1")
+set(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS "-s WASM_BIGINT -s SIDE_MODULE=1 -fwasm-exceptions")
+set(CMAKE_STRIP FALSE)

recipes/recipes_emscripten/simpleitk/recipe.yaml

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+context:
+  name: SimpleITK
+  version: "2.5.3"
+
+package:
+  name: simpleitk
+  version: ${{ version }}
+
+source:
+- url: https://github.com/SimpleITK/SimpleITK/releases/download/v${{ version }}/SimpleITK-${{ version }}.tar.gz
+  sha256: 1ef3642b0695c8eb0a0193fefe7677c57bce94a86d6b01f48f58b2291b4ca935
+
+build:
+  number: 0
+  files:
+    exclude:
+    - '**/__pycache__/**'
+    - '**/*.pyc'
+  python:
+    skip_pyc_compilation:
+    - '**/*.py'
+
+requirements:
+  build:
+  - ${{ compiler('c') }}
+  - ${{ compiler('cxx') }}
+  - cmake
+  - ninja
+  - swig >=4.0.0
+  - cross-python_${{ target_platform }}
+  - python
+  host:
+  - python
+  - pip
+  - libitk
+  run:
+  - python
+
+tests:
+- script: pytester
+  files:
+    recipe:
+    - test_import_simpleitk.py
+  requirements:
+    build:
+    - pytester
+    run:
+    - pytester-run
+
+about:
+  homepage: http://www.simpleitk.org
+  license: Apache-2.0
+  license_file: LICENSE
+  summary: Simplified interface to the Insight Toolkit for image registration and segmentation
+  description: |
+    SimpleITK is a simplified layer built on top of ITK (Insight Segmentation and
+    Registration Toolkit). It provides bindings for multiple programming languages
+    including Python, Java, C#, R, Lua, Tcl, and Ruby.
+  repository: https://github.com/SimpleITK/SimpleITK
+
+extra:
+  recipe-maintainers:
+  - Copilot

recipes/recipes_emscripten/simpleitk/test_import_simpleitk.py

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+def test_import_simpleitk():
+    import SimpleITK as sitk
+    # Basic sanity check
+    img = sitk.Image(10, 10, sitk.sitkUInt8)
+    assert img.GetWidth() == 10
+    assert img.GetHeight() == 10