libcamera: geometry: Give constructors to Rectangle

Rectangle, unlike Size, has no constructor, requiring the users to
explicitly initialize the instances. This is error-prone, add
constructors.

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

include/libcamera/geometry.h

@@ -127,6 +127,21 @@ static inline bool operator!=(const SizeRange &lhs, const SizeRange &rhs)
 }
 
 struct Rectangle {
+	Rectangle()
+		: Rectangle(0, 0, 0, 0)
+	{
+	}
+
+	Rectangle(int xpos, int ypos, const Size &size)
+		: x(xpos), y(ypos), width(size.width), height(size.height)
+	{
+	}
+
+	Rectangle(int xpos, int ypos, unsigned int w, unsigned int h)
+		: x(xpos), y(ypos), width(w), height(h)
+	{
+	}
+
 	int x;
 	int y;
 	unsigned int width;

src/libcamera/camera_sensor.cpp

@@ -487,7 +487,7 @@ int CameraSensor::sensorInfo(CameraSensorInfo *info) const
 	info->model = model();
 
 	/* Get the active area size. */
-	Rectangle rect = {};
+	Rectangle rect;
 	int ret = subdev_->getSelection(pad_, V4L2_SEL_TGT_CROP_DEFAULT, &rect);
 	if (ret) {
 		LOG(CameraSensor, Error)

src/libcamera/geometry.cpp

@@ -297,6 +297,28 @@ bool operator==(const SizeRange &lhs, const SizeRange &rhs)
  * refers to, are defined by the context were rectangle is used.
  */
 
+/**
+ * \fn Rectangle::Rectangle()
+ * \brief Construct a Rectangle with all coordinates set to 0
+ */
+
+/**
+ * \fn Rectangle::Rectangle(int x, int y, const Size &size)
+ * \brief Construct a Rectangle with the given position and size
+ * \param[in] x The horizontal coordinate of the top-left corner
+ * \param[in] y The vertical coordinate of the top-left corner
+ * \param[in] size The size
+ */
+
+/**
+ * \fn Rectangle::Rectangle(int x, int y, unsigned int width, unsigned int height)
+ * \brief Construct a Rectangle with the given position and size
+ * \param[in] x The horizontal coordinate of the top-left corner
+ * \param[in] y The vertical coordinate of the top-left corner
+ * \param[in] width The width
+ * \param[in] height The height
+ */
+
 /**
  * \var Rectangle::x
  * \brief The horizontal coordinate of the rectangle's top-left corner

src/libcamera/pipeline/ipu3/imgu.cpp

@@ -100,12 +100,7 @@ int ImgUDevice::configureInput(const Size &size,
 	 * to configure the crop/compose rectangles, contradicting the
 	 * V4L2 specification.
 	 */
-	Rectangle rect = {
-		.x = 0,
-		.y = 0,
-		.width = inputFormat->size.width,
-		.height = inputFormat->size.height,
-	};
+	Rectangle rect{ 0, 0, inputFormat->size };
 	ret = imgu_->setSelection(PAD_INPUT, V4L2_SEL_TGT_CROP, &rect);
 	if (ret)
 		return ret;

src/libcamera/pipeline/raspberrypi/raspberrypi.cpp

@@ -752,12 +752,7 @@ int PipelineHandlerRPi::configure(Camera *camera, CameraConfiguration *config)
 	}
 
 	/* Adjust aspect ratio by providing crops on the input image. */
-	Rectangle crop = {
-		.x = 0,
-		.y = 0,
-		.width = sensorFormat.size.width,
-		.height = sensorFormat.size.height
-	};
+	Rectangle crop{ 0, 0, sensorFormat.size };
 
 	int ar = maxSize.height * sensorFormat.size.width - maxSize.width * sensorFormat.size.height;
 	if (ar > 0)

src/libcamera/pipeline/vimc/vimc.cpp

@@ -256,12 +256,7 @@ int PipelineHandlerVimc::configure(Camera *camera, CameraConfiguration *config)
 		return ret;
 
 	if (data->media_->version() >= KERNEL_VERSION(5, 6, 0)) {
-		Rectangle crop = {
-			.x = 0,
-			.y = 0,
-			.width = subformat.size.width,
-			.height = subformat.size.height,
-		};
+		Rectangle crop{ 0, 0, subformat.size };
 		ret = data->scaler_->setSelection(0, V4L2_SEL_TGT_CROP, &crop);
 		if (ret)
 			return ret;