[libcamera-devel] [PATCH v3 1/3] qcam: Queue requests only through MainWindow::queueRequest()

[Utkarsh Tiwari]

Currently to request a frame, we operate the camera directly.
This approach is also scattered in two places,
MainWindow::startCapture() and MainWindow::queueRequest().
This makes it difficult to account requests.

Centralize all the queuing to a single function queueRequest()

Rename the current queueRequest() to renderComplete(),
This makes more sense as this slot is triggered when
the render is complete and we want to queue another
request.

Signed-off-by: Utkarsh Tiwari <utkarsh02t at gmail.com>
---
 src/qcam/main_window.cpp | 14 +++++++++-----
 src/qcam/main_window.h   |  3 ++-
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/src/qcam/main_window.cpp b/src/qcam/main_window.cpp
index dd0e51f5..adeb3181 100644
--- a/src/qcam/main_window.cpp
+++ b/src/qcam/main_window.cpp
@@ -119,14 +119,14 @@ MainWindow::MainWindow(CameraManager *cm, const OptionsParser::Options &options)
 	if (renderType == "qt") {
 		ViewFinderQt *viewfinder = new ViewFinderQt(this);
 		connect(viewfinder, &ViewFinderQt::renderComplete,
-			this, &MainWindow::queueRequest);
+			this, &MainWindow::renderComplete);
 		viewfinder_ = viewfinder;
 		setCentralWidget(viewfinder);
 #ifndef QT_NO_OPENGL
 	} else if (renderType == "gles") {
 		ViewFinderGL *viewfinder = new ViewFinderGL(this);
 		connect(viewfinder, &ViewFinderGL::renderComplete,
-			this, &MainWindow::queueRequest);
+			this, &MainWindow::renderComplete);
 		viewfinder_ = viewfinder;
 		setCentralWidget(viewfinder);
 #endif
@@ -521,7 +521,7 @@ int MainWindow::startCapture()
 
 	/* Queue all requests. */
 	for (std::unique_ptr<Request> &request : requests_) {
-		ret = camera_->queueRequest(request.get());
+		ret = queueRequest(request.get());
 		if (ret < 0) {
 			qWarning() << "Can't queue request";
 			goto error_disconnect;
@@ -755,7 +755,7 @@ void MainWindow::processViewfinder(FrameBuffer *buffer)
 	viewfinder_->render(buffer, mappedBuffers_[buffer].get());
 }
 
-void MainWindow::queueRequest(FrameBuffer *buffer)
+void MainWindow::renderComplete(FrameBuffer *buffer)
 {
 	Request *request;
 	{
@@ -784,6 +784,10 @@ void MainWindow::queueRequest(FrameBuffer *buffer)
 			qWarning() << "No free buffer available for RAW capture";
 		}
 	}
+	queueRequest(request);
+}
 
-	camera_->queueRequest(request);
+int MainWindow::queueRequest(Request *request)
+{
+	return camera_->queueRequest(request);
 }
diff --git a/src/qcam/main_window.h b/src/qcam/main_window.h
index 3fbe872c..c3e4b665 100644
--- a/src/qcam/main_window.h
+++ b/src/qcam/main_window.h
@@ -66,7 +66,7 @@ private Q_SLOTS:
 	void processRaw(libcamera::FrameBuffer *buffer,
 			const libcamera::ControlList &metadata);
 
-	void queueRequest(libcamera::FrameBuffer *buffer);
+	void renderComplete(libcamera::FrameBuffer *buffer);
 
 private:
 	int createToolbars();
@@ -80,6 +80,7 @@ private:
 	void addCamera(std::shared_ptr<libcamera::Camera> camera);
 	void removeCamera(std::shared_ptr<libcamera::Camera> camera);
 
+	int queueRequest(libcamera::Request *request);
 	void requestComplete(libcamera::Request *request);
 	void processCapture();
 	void processHotplug(HotplugEvent *e);
-- 
2.25.1