libcamera: geometry: Add two-point Rectangle constructor

Add a constructor to the Rectangle class that accepts two points.

The constructed Rectangle spans all the space between the two given
points.

Signed-off-by: Yudhistira Erlandinata <yerlandinata@chromium.org>
Co-developed-by: Harvey Yang <chenghaoyang@chromium.org>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Harvey Yang <chenghaoyang@chromium.org>

3 files changed, 30 insertions, 0 deletions

diff --git a/include/libcamera/geometry.h b/include/libcamera/geometry.h
index 3e6f0f5d..9ca5865a 100644
--- a/include/libcamera/geometry.h
+++ b/include/libcamera/geometry.h
@@ -262,6 +262,15 @@ public:
 	{
 	}
 
+	constexpr Rectangle(const Point &point1, const Point &point2)
+		: Rectangle(std::min(point1.x, point2.x), std::min(point1.y, point2.y),
+			    static_cast<unsigned int>(std::max(point1.x, point2.x)) -
+			    static_cast<unsigned int>(std::min(point1.x, point2.x)),
+			    static_cast<unsigned int>(std::max(point1.y, point2.y)) -
+			    static_cast<unsigned int>(std::min(point1.y, point2.y)))
+	{
+	}
+
 	int x;
 	int y;
 	unsigned int width;
diff --git a/src/libcamera/geometry.cpp b/src/libcamera/geometry.cpp
index 85a7f53a..90ccf8c1 100644
--- a/src/libcamera/geometry.cpp
+++ b/src/libcamera/geometry.cpp
@@ -636,6 +636,13 @@ std::ostream &operator<<(std::ostream &out, const SizeRange &sr)
  */
 
 /**
+ * \fn Rectangle::Rectangle(const Point &point1, const Point &point2)
+ * \brief Construct a Rectangle from two opposite corners
+ * \param[in] point1 One of corners of the rectangle
+ * \param[in] point2 The opposite corner of \a point1
+ */
+
+/**
  * \var Rectangle::x
  * \brief The horizontal coordinate of the rectangle's top-left corner
  *
diff --git a/test/geometry.cpp b/test/geometry.cpp
index 64169206..5760fa3c 100644
--- a/test/geometry.cpp
+++ b/test/geometry.cpp
@@ -481,6 +481,20 @@ protected:
 			return TestFail;
 		}
 
+		Point topLeft(3, 3);
+		Point bottomRight(30, 30);
+		Point topRight(30, 3);
+		Point bottomLeft(3, 30);
+		Rectangle rect1(topLeft, bottomRight);
+		Rectangle rect2(topRight, bottomLeft);
+		Rectangle rect3(bottomRight, topLeft);
+		Rectangle rect4(bottomLeft, topRight);
+
+		if (rect1 != rect2 || rect1 != rect3 || rect1 != rect4) {
+			cout << "Point-to-point construction failed" << endl;
+			return TestFail;
+		}
+
 		return TestPass;
 	}
 };