ENH: Initial Wasm build configuration

.github/workflows/wasm.yml

@@ -0,0 +1,61 @@
+name: WebAssembly
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+       - '*'
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build-wasm:
+    name: "build-test-wasm"
+    runs-on: ubuntu-22.04
+
+    steps:
+    - name: Free Disk Space (Ubuntu)
+      uses: jlumbroso/free-disk-space@main
+      with:
+        large-packages: false
+
+    - name: Install cypress deps
+      run: |
+        sudo apt-get update
+        # https://docs.cypress.io/guides/continuous-integration/introduction#Dependencies
+        sudo apt-get install -y libgtk2.0-0 libgtk-3-0 libgbm-dev libnotify-dev libgconf-2-4 libnss3 libxss1 libasound2 libxtst6 xauth xvfb
+
+    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
+
+    - uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3.6.0
+      with:
+        node-version: '18'
+
+    - name: Install
+      run: |
+        npm ci
+        npm run build:testData
+
+    - name: Build TypeScript
+      working-directory: ./wasm/typescript
+      run: |
+        npm ci
+        npm run build
+
+    - name: Test TypeScript
+      working-directory: ./wasm/typescript
+      run: |
+        npm test
+
+    - uses: actions/setup-python@61a6322f88396a6271a6ee3565807d608ecaddd1 # v4.7.0
+      with:
+        python-version: '3.10'
+
+    - name: Test Python WASI
+      working-directory: ./wasm/python/itkwasm-elastix-wasi
+      run: |
+        pip install pytest itkwasm-compare-images itk-io
+        pip install -e .
+        pytest -s

.gitignore

@@ -17,3 +17,8 @@ zstd-1.2.0-linux.tar
 zstd-1.2.0-linux/
 .ipynb_checkpoints/
 examples/Parameters.*.txt
+node_modules/
+wasi-build
+emscripten-build
+wasm/typescript/demo/
+wasm/test

CMakeLists.txt

@@ -55,8 +55,14 @@ if(SKBUILD)
   mark_as_advanced(ELASTIX_NO_INSTALL_EXECUTABLES ELASTIX_NO_INSTALL_RUNTIME_LIBRARIES ELASTIX_NO_INSTALL_DEVELOPMENT)
 endif()
 
-set(elastix_GIT_REPOSITORY "https://github.com/SuperElastix/elastix.git")
-set(elastix_GIT_TAG "798ecaebab9d264d0f3cb375a1bf74174c41343c")
+if(WASI OR EMSCRIPTEN)
+  option(ELASTIX_USE_OPENMP "OpenMP not supported on WASI or Emscripten" OFF)
+  option(ELASTIX_NO_INSTALL_EXECUTABLES "Do not install executables" ON)
+endif()
+
+# set(elastix_GIT_REPOSITORY "https://github.com/SuperElastix/elastix.git")
+set(elastix_GIT_REPOSITORY "https://github.com/thewtex/elastix.git")
+set(elastix_GIT_TAG "e5428a8b8347d869040fc5b3ecc58106368c8ce4")
 FetchContent_Declare(
   elx
   GIT_REPOSITORY ${elastix_GIT_REPOSITORY}
@@ -94,9 +100,10 @@ if(ELASTIX_USE_OPENCL)
 endif()
 
 # Reset parameters for ITK remote module build
-set(BUILD_TESTING ${_itk_build_testing})
-set(BUILD_SHARED_LIBS ${_itk_build_shared})
-
+if (NOT WASI AND NOT EMSCRIPTEN)
+  set(BUILD_TESTING ${_itk_build_testing})
+  set(BUILD_SHARED_LIBS ${_itk_build_shared})
+endif()
 
 if(ITK_WRAP_PYTHON) # Python wrapping is enabled
   get_property(multi_config GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
@@ -111,10 +118,16 @@ if(ITK_WRAP_PYTHON) # Python wrapping is enabled
   endif()
 endif()
 
+option(ITKELASTIX_BUILD_WASM_EXECUTABLES "Build WASM executables" OFF)
+
 if(NOT ITK_SOURCE_DIR)
   find_package(ITK REQUIRED)
   list(APPEND CMAKE_MODULE_PATH ${ITK_CMAKE_DIR})
   include(ITKModuleExternal)
+  if(WASI OR EMSCRIPTEN OR ITKELASTIX_BUILD_WASM_EXECUTABLES)
+    set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+    add_subdirectory(wasm)
+  endif()
 else()
   set(ITK_DIR ${CMAKE_BINARY_DIR})
   itk_module_impl()

examples/ITK_Example13_ITKResampling.ipynb

@@ -198,7 +198,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -212,7 +212,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.0"
+   "version": "3.11.5"
   }
  },
  "nbformat": 4,

examples/ITK_Example21_ConstrainedRegistration.ipynb

@@ -356,7 +356,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.0"
+   "version": "3.11.5"
   }
  },
  "nbformat": 4,

itk-module.cmake

@@ -26,6 +26,7 @@ itk_module(Elastix
   TEST_DEPENDS
     ITKTestKernel
     ITKMetaIO
+    ITKTransformIO
   DESCRIPTION
     "${DOCUMENTATION}"
   EXCLUDE_FROM_DEFAULT