add package pi-heif (pyodide#5243)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

packages/pi-heif/meta.yaml

@@ -0,0 +1,30 @@
+package:
+  name: pi-heif
+  version: 0.21.0
+  top-level:
+    - pi_heif
+source:
+  url: https://files.pythonhosted.org/packages/f5/12/e87b1a7e5b353f885b646ee9c966be74b7db0ae9d68abc712411487353d7/pi_heif-0.21.0.tar.gz
+  sha256: 4902cdb84e75505e1d9abdd5aff1e6dcfebe569ec825162d68a4a399a43689a4
+requirements:
+  run:
+    - cffi
+    - Pillow
+    - libheif
+  host:
+    - cffi
+    - libheif
+build:
+  script: |
+    export LIBHEIF_ROOT=${WASM_LIBRARY_DIR}
+test:
+  imports:
+    - pi_heif
+about:
+  home: https://github.com/bigcat88/pillow_heif
+  PyPI: https://pypi.org/project/pi_heif
+  summary: Python 3.6+ interface to libheif library
+  license: LGPL-2.1
+extra:
+  recipe-maintainers:
+    - airen1986

packages/pi-heif/test_pi_heif.py

@@ -0,0 +1,48 @@
+import base64
+import pathlib
+
+from pytest_pyodide import run_in_pyodide
+
+DEMO_PATH = pathlib.Path(__file__).parent / "test_data"
+SAMPLE_IMAGE = base64.b64encode(
+    (DEMO_PATH / "tree-with-transparency.heic").read_bytes()
+)
+
+
+def test_heif(selenium):
+    @run_in_pyodide(packages=["Pillow", "pi-heif"])
+    def _test_heif_inner(selenium, image_base64):
+        import base64
+
+        with open("tree-with-transparency.heic", "wb") as f:
+            f.write(base64.b64decode(image_base64))
+
+        import pi_heif
+
+        if pi_heif.is_supported("tree-with-transparency.heic"):
+            heif_file = pi_heif.open_heif(
+                "tree-with-transparency.heic", convert_hdr_to_8bit=False
+            )
+            assert heif_file.mode == "RGBA"
+
+    _test_heif_inner(selenium, SAMPLE_IMAGE)
+
+
+def test_pillow(selenium):
+    @run_in_pyodide(packages=["Pillow", "pillow-heif"])
+    def _test_pillow_inner(selenium, image_base64):
+        import base64
+
+        with open("tree-with-transparency.heic", "wb") as f:
+            f.write(base64.b64decode(image_base64))
+
+        from pi_heif import register_heif_opener
+        from PIL import Image
+
+        register_heif_opener()
+
+        im = Image.open("tree-with-transparency.heic")
+        assert im.size == (262, 264)
+        assert im.mode == "RGBA"
+
+    _test_pillow_inner(selenium, SAMPLE_IMAGE)