Add stride test

Add a test to check the stride is being set correctly when provided in
the stream configuration

Signed-off-by: William Vinnicombe <[email protected]>

tests/stride_test.py

@@ -0,0 +1,41 @@
+#!/usr/bin/python3
+
+import time
+
+from picamera2 import MappedArray, Picamera2, libcamera
+
+
+def pre_callback(request):
+    # Set the size, to make preview window and MappedArray remapping work
+    assert request.config["main"]["stride"] == stride
+    request.config["main"]["size"] = full_size
+    request.stream_map["main"].configuration.size = libcamera.Size(*full_size)
+
+
+def post_callback(request):
+    # Make right side grey
+    with MappedArray(request, "main") as m1:
+        a1 = m1.array
+        a1[:, -a1.shape[1] // 2:] = 70
+
+
+picam2 = Picamera2(0)
+
+full_size = (1920, 1080)
+half_size = (full_size[0] // 2, full_size[1])
+# Calculate stride for full frame
+full_config = picam2.create_preview_configuration({"size": full_size})
+picam2.configure(full_config)
+stride = picam2.camera_config["main"]["stride"]
+
+# Configure as half frame, with full frame stride so right side is blank
+picam2.pre_callback = pre_callback
+picam2.post_callback = post_callback
+main_config = picam2.create_preview_configuration(
+    main={"size": half_size, "stride": stride}
+)
+picam2.configure(main_config)
+picam2.start_preview(True)
+
+picam2.start()
+time.sleep(2)

tests/test_list.txt

@@ -77,3 +77,4 @@ tests/qt_gl_preview_test.py
 tests/stop_slow_framerate.py
 tests/allocator_test.py
 tests/allocator_leak_test.py
+tests/stride_test.py