ci: Add python wheel workflow

.github/workflows/python-wheels.yml

@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright (c) Contributors to the OpenEXR Project.
+
+name: Python Wheels
+
+on:
+
+  # Run on all changes (PR and push) to the python binding
+  # source/configuration files, except on the release branches, which
+  # have their own workflow, which also publish to pypi/test.pypi.
+  # Note that changes to the core libraries will *not*
+  # trigger building the wheels. However, the main ci workflow does
+  # build and test the bindings (for a single python version on a
+  # single arch)
+
+  push:
+    branches-ignore:
+      - RB-*
+    paths:
+      - 'src/**'
+      - 'pyproject.toml'
+      - '.github/workflows/python-wheels.yml'
+  pull_request:
+    branches-ignore:
+      - RB-*
+    paths:
+      - 'src/**'
+      - 'pyproject.toml'
+      - '.github/workflows/python-wheels.yml'
+
+permissions:
+  contents: read
+
+jobs:
+  build_wheels:
+    name: Python Wheels - ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+
+      - name: Install Python 
+        uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3 # v5.2.0
+        with:
+          python-version: '3.x'
+
+      - name: Create sdist
+        # Only create it once.
+        if: ${{ matrix.os == 'ubuntu-latest' }}
+        run: pipx run build --sdist . --outdir wheelhouse
+
+      - name: Build wheel
+        uses: pypa/cibuildwheel@79b0dd328794e1180a7268444d46cdf12e1abd01 # v2.21.0
+        env:
+          CIBW_ARCHS_MACOS: x86_64 arm64 universal2
+          # Build Python 3.7 through 3.11.
+          # Skip python 3.6 since scikit-build-core requires 3.7+
+          # Skip 32-bit wheels builds on Windows
+          # Also skip the PyPy builds, since they fail the unit tests
+          CIBW_BUILD: "cp37-* cp38-* cp39-* cp310-* cp311-*"
+          CIBW_SKIP: "*-win32 *_i686"
+          CIBW_TEST_SKIP: "*-macosx*arm64"
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@50769540e7f4bd5e21e526ee35c689e35e0d6874 # v4.4.0
+        with:
+          name: wheels-${{ matrix.os }}
+          path: |
+            ./wheelhouse/*.whl
+            ./wheelhouse/*.tar.gz

pyproject.toml

@@ -0,0 +1,77 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright (c) Contributors to the OpenEXR Project.
+
+[build-system]
+requires = ["scikit-build-core==0.8.1", "pybind11"]
+build-backend = "scikit_build_core.build"
+
+[project]
+name = "Imath"
+dynamic = []
+
+description="Python bindings for the Imath  a basic, light-weight, and efficient C++ representation of 2D and 3D vectors and matrices and other simple but useful mathematical objects, functions, and data types common in computer graphics applications, including the “half” 16-bit floating-point type."
+readme = "README.md"
+authors = [
+  { name="Contributors to the OpenEXR project", email="[email protected]" },
+]
+requires-python = ">=3.7"
+
+[project.urls]
+"Homepage" = "https://imath.readthedocs.io/"
+"Source" = "https://github.com/AcademySoftwareFoundation/Imath"
+"Bug Tracker" = "https://github.com/AcademySoftwareFoundation/Imath/issues"
+
+[project.optional-dependencies]
+test = ["pytest"]
+
+[tool.pytest.ini_options]
+minversion = "6.0"
+addopts = ["-ra", "--showlocals", "--strict-markers", "--strict-config"]
+xfail_strict = true
+log_cli_level = "INFO"
+filterwarnings = [
+  "error",
+]
+testpaths = ["tests"]
+
+[tool.scikit-build]
+wheel.expand-macos-universal-tags = true
+sdist.exclude = [".github", "src/**Test", "website", "share"]
+
+# Only build the PyOpenEXR (cmake --build --target PyOpenEXR).
+cmake.targets = ["Imath"]
+# Only install the "python" component (cmake --install --component python).
+# This makes sure that only files marked as "python" component are installed.
+install.components = ["python"]
+# strip debug symbols
+install.strip = true
+
+# Enable experimental features if any are available
+# In this case we need custom local plugin to get
+# the project version from cmake.
+experimental = true
+
+
+[tool.scikit-build.cmake.define]
+IMATH_INSTALL = 'OFF'
+IMATH_BUILD_PYTHON = 'ON'
+IMATH_BUILD_EXAMPLES = 'OFF'
+IMATH_BUILD_TOOLS = 'OFF'
+BUILD_SHARED_LIBS = 'OFF'
+CMAKE_OSX_DEPLOYMENT_TARGET = '10.15'
+CMAKE_POSITION_INDEPENDENT_CODE = 'ON'
+
+[tool.cibuildwheel]
+test-command = "pytest -s {project}/src/python/tests"
+test-requires = ["numpy"]
+test-extras = ["test"]
+test-skip = ["*universal2:arm64"]
+build-verbosity = 1
+
+manylinux-x86_64-image = "manylinux2014"
+manylinux-i686-image = "manylinux2014"
+manylinux-aarch64-image = "manylinux2014"
+
+# Needed for full C++17 support
+[tool.cibuildwheel.macos.environment]
+MACOSX_DEPLOYMENT_TARGET = "10.15"