libcamera: geometry: Add Rectangle::transformedBetween()

Handling cropping and scaling within a complicated pipeline involves
transformations of rectangles between different coordinate systems. For
example the full input of the dewarper (0,0)/1920x1080 might correspond
to the rectangle (0, 243)/2592x1458 in sensor coordinates (of a
2592x1944 sensor). Add a function that allows the transformation of a
rectangle defined in one reference frame (dewarper) into the coordinates
of a second reference frame (sensor).

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/test/geometry.cpp b/test/geometry.cpp
index 5760fa3c..11df043b 100644
--- a/test/geometry.cpp
+++ b/test/geometry.cpp
@@ -495,6 +495,17 @@ protected:
 			return TestFail;
 		}
 
+		Rectangle f1 = Rectangle(100, 200, 3000, 2000);
+		Rectangle f2 = Rectangle(200, 300, 1500, 1000);
+		/* Bottom right quarter of the corresponding frames. */
+		Rectangle r1 = Rectangle(100 + 1500, 200 + 1000, 1500, 1000);
+		Rectangle r2 = Rectangle(200 + 750, 300 + 500, 750, 500);
+		if (r1.transformedBetween(f1, f2) != r2 ||
+		    r2.transformedBetween(f2, f1) != r1) {
+			cout << "Rectangle::transformedBetween() test failed" << endl;
+			return TestFail;
+		}
+
 		return TestPass;
 	}
 };