libcamera: geometry: Add isNull() function to Rectangle class

It's common for code to check if a rectangle is null. Add a helper function
to do so and test the function in test/geometry.cpp

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/test/geometry.cpp b/test/geometry.cpp
index 1a9fc1b8..08e268c9 100644
--- a/test/geometry.cpp
+++ b/test/geometry.cpp
@@ -182,6 +182,20 @@ protected:
 		if (!compare(Size(200, 100), Size(100, 200), &operator>=, ">=", true))
 			return TestFail;
 
+		/* Test Rectangle::isNull(). */
+		if (!Rectangle(0, 0, 0, 0).isNull() ||
+		    !Rectangle(1, 1, 0, 0).isNull()) {
+			cout << "Null rectangle incorrectly reported as not null" << endl;
+			return TestFail;
+		}
+
+		if (Rectangle(0, 0, 0, 1).isNull() ||
+		    Rectangle(0, 0, 1, 0).isNull() ||
+		    Rectangle(0, 0, 1, 1).isNull()) {
+			cout << "Non-null rectangle incorrectly reported as null" << endl;
+			return TestFail;
+		}
+
 		return TestPass;
 	}
 };