qcam: Provide save image functionality

Implement a save image button on the toolbar which will take a current
viewfinder image and present the user with a QFileDialog to allow them
to choose where to save the image.

Utilise the QImageWriter to perform the output task.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/src/qcam/viewfinder.cpp b/src/qcam/viewfinder.cpp
index 6de284d1..d51eebb1 100644
--- a/src/qcam/viewfinder.cpp
+++ b/src/qcam/viewfinder.cpp
@@ -6,6 +6,8 @@
  */
 
 #include <QImage>
+#include <QImageWriter>
+#include <QMutexLocker>
 #include <QPainter>
 
 #include "format_converter.h"
@@ -23,10 +25,25 @@ ViewFinder::~ViewFinder()
 
 void ViewFinder::display(const unsigned char *raw, size_t size)
 {
+	QMutexLocker locker(&mutex_);
+
+	/*
+	 * \todo We're not supposed to block the pipeline handler thread
+	 * for long, implement a better way to save images without
+	 * impacting performances.
+	 */
+
 	converter_.convert(raw, size, image_);
 	update();
 }
 
+QImage ViewFinder::getCurrentImage()
+{
+	QMutexLocker locker(&mutex_);
+
+	return image_->copy();
+}
+
 int ViewFinder::setFormat(unsigned int format, unsigned int width,
 			  unsigned int height)
 {