Govern task context and advance execution pointer

tools/web/check-pointcloud-desktop.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+import hashlib
+import json
+import os
+import pathlib
+import sys
+import tempfile
+
+import bpy
+
+
+def rounded(value):
+    return round(float(value), 6)
+
+
+def report():
+    data = bpy.data.pointclouds.get("WebGapPointCloud")
+    if data is None:
+        raise RuntimeError("WebGapPointCloud is missing")
+    positions = [0.0] * (len(data.points) * 3)
+    data.points.foreach_get("co", positions)
+    radius = data.attributes.get("radius")
+    radii = [0.0] * len(data.points)
+    if radius is not None:
+        radius.data.foreach_get("value", radii)
+    return {
+        "id": "pointcloud:" + data.name,
+        "name": data.name,
+        "pointCount": len(data.points),
+        "controlPoints": [rounded(value) for value in positions],
+        "radii": [rounded(value) for value in radii],
+    }
+
+
+def main():
+    arguments = sys.argv[sys.argv.index("--") + 1 :]
+    if len(arguments) != 2:
+        raise SystemExit("usage: blender -b --python check-pointcloud-desktop.py -- FIXTURE REPORT")
+    fixture, output = (pathlib.Path(value).resolve() for value in arguments)
+    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=False)
+    before = report()
+    descriptor, temporary = tempfile.mkstemp(prefix="m16-pointcloud-reopen-", suffix=".blend", dir=fixture.parent)
+    os.close(descriptor)
+    try:
+        bpy.ops.wm.save_as_mainfile(filepath=temporary, check_existing=False, compress=True)
+        bpy.ops.wm.open_mainfile(filepath=temporary, load_ui=False)
+        after = report()
+    finally:
+        pathlib.Path(temporary).unlink(missing_ok=True)
+    if before != after:
+        raise RuntimeError(f"point cloud save/reopen drift: {before} != {after}")
+    value = {
+        "schemaVersion": 1,
+        "task": "M16-GAP-00019",
+        "operation": "POINT_CLOUD_DATABLOCK_DESKTOP",
+        "fixture": str(fixture),
+        "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
+        "pointCloud": after,
+        "saveReopen": "EXACT",
+        "blenderVersion": bpy.app.version_string,
+    }
+    output.parent.mkdir(parents=True, exist_ok=True)
+    output.write_text(json.dumps(value, indent=2, sort_keys=True) + "\n", encoding="utf-8")
+    print(f"pointcloud-desktop-ok id={after['id']} points={after['pointCount']} saveReopen=exact")
+
+
+if __name__ == "__main__":
+    main()