Add AVFCameraWindowControl as QVideoWindowControl_iid implementation

AVFCameraWindowControl is a renderer backend,
when QCamera viewfinder output set to QVideoWidget on macOS or iOS.
As it uses native API and lets the OS handle rendering pipeline,
it is an efficient alternative to default renderer backend.

Task-number: QTBUG-68779
Change-Id: I4d27022655a7d9f4ad7cf99c84b570a0c48cf10a
Reviewed-by: VaL Doroshchuk <valentyn.doroshchuk@qt.io>

1 files changed, 33 insertions, 0 deletions

diff --git a/src/plugins/avfoundation/camera/avfcamerasession.mm b/src/plugins/avfoundation/camera/avfcamerasession.mm
index 3c5f8f09a..6ee9c2636 100644
--- a/src/plugins/avfoundation/camera/avfcamerasession.mm
+++ b/src/plugins/avfoundation/camera/avfcamerasession.mm
@@ -48,6 +48,7 @@
 #include "avfcameraviewfindersettingscontrol.h"
 #include "avfimageencodercontrol.h"
 #include "avfcamerautility.h"
+#include "avfcamerawindowcontrol.h"
 
 #include <CoreFoundation/CoreFoundation.h>
 #include <Foundation/Foundation.h>
@@ -146,6 +147,7 @@ QList<AVFCameraInfo> AVFCameraSession::m_cameraDevices;
 AVFCameraSession::AVFCameraSession(AVFCameraService *service, QObject *parent)
    : QObject(parent)
    , m_service(service)
+   , m_capturePreviewWindowOutput(nullptr)
    , m_state(QCamera::UnloadedState)
    , m_active(false)
    , m_videoInput(nil)
@@ -160,6 +162,10 @@ AVFCameraSession::AVFCameraSession(AVFCameraService *service, QObject *parent)
 
 AVFCameraSession::~AVFCameraSession()
 {
+    if (m_capturePreviewWindowOutput) {
+        m_capturePreviewWindowOutput->setLayer(nil);
+    }
+
     if (m_videoInput) {
         [m_captureSession removeInput:m_videoInput];
         [m_videoInput release];
@@ -257,6 +263,29 @@ void AVFCameraSession::setVideoOutput(AVFCameraRendererControl *output)
         output->configureAVCaptureSession(this);
 }
 
+void AVFCameraSession::setCapturePreviewOutput(AVFCameraWindowControl *output)
+{
+#ifdef QT_DEBUG_AVF
+    qDebug() << Q_FUNC_INFO << output;
+#endif
+
+    if (m_capturePreviewWindowOutput == output)
+        return;
+
+    if (m_capturePreviewWindowOutput)
+        m_capturePreviewWindowOutput->setLayer(nil);
+
+    m_capturePreviewWindowOutput = output;
+
+    if (m_capturePreviewWindowOutput) {
+        AVCaptureVideoPreviewLayer *previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:m_captureSession];
+        m_capturePreviewWindowOutput->setLayer(previewLayer);
+        if (AVFCameraViewfinderSettingsControl2 *vfControl = m_service->viewfinderSettingsControl2()) {
+            m_capturePreviewWindowOutput->setNativeSize(vfControl->viewfinderSettings().resolution());
+        }
+    }
+}
+
 AVCaptureDevice *AVFCameraSession::videoCaptureDevice() const
 {
     if (m_videoInput)
@@ -409,6 +438,10 @@ bool AVFCameraSession::applyViewfinderSettings()
         }
 
         vfControl->applySettings(vfSettings);
+
+        if (m_capturePreviewWindowOutput)
+            m_capturePreviewWindowOutput->setNativeSize(vfControl->viewfinderSettings().resolution());
+
         return !vfSettings.isNull();
     }