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>
This commit is contained in:
Kieran Bingham 2020-02-05 16:02:05 +00:00
parent 2dc85eabe1
commit 0f292e7821
5 changed files with 47 additions and 0 deletions

View file

@ -1,6 +1,7 @@
<!DOCTYPE RCC><RCC version="1.0">
<qresource>
<file>./play-circle.svg</file>
<file>./save.svg</file>
<file>./stop-circle.svg</file>
<file>./x-circle.svg</file>
</qresource>

View file

@ -12,7 +12,10 @@
#include <QComboBox>
#include <QCoreApplication>
#include <QFileDialog>
#include <QIcon>
#include <QImage>
#include <QImageWriter>
#include <QInputDialog>
#include <QTimer>
#include <QToolBar>
@ -88,6 +91,9 @@ int MainWindow::createToolbars()
action = toolbar_->addAction(QIcon(":stop-circle.svg"), "stop");
connect(action, &QAction::triggered, this, &MainWindow::stopCapture);
action = toolbar_->addAction(QIcon(":save.svg"), "saveAs");
connect(action, &QAction::triggered, this, &MainWindow::saveImageAs);
return 0;
}
@ -339,6 +345,22 @@ void MainWindow::stopCapture()
setWindowTitle(title_);
}
void MainWindow::saveImageAs()
{
QImage image = viewfinder_->getCurrentImage();
QString filename = QFileDialog::getSaveFileName(this, "Save Image", "",
"Image Files (*.png *.jpg *.jpeg)");
std::cout << "Save image to " << filename.toStdString() << std::endl;
if (filename.isEmpty())
return;
QImageWriter writer(filename);
writer.write(image);
}
void MainWindow::requestComplete(Request *request)
{
if (request->status() == Request::RequestCancelled)

View file

@ -49,6 +49,8 @@ private Q_SLOTS:
int startCapture();
void stopCapture();
void saveImageAs();
private:
int createToolbars();
std::string chooseCamera();

View file

@ -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)
{

View file

@ -7,6 +7,7 @@
#ifndef __QCAM_VIEWFINDER_H__
#define __QCAM_VIEWFINDER_H__
#include <QMutex>
#include <QWidget>
#include "format_converter.h"
@ -23,6 +24,8 @@ public:
unsigned int height);
void display(const unsigned char *rgb, size_t size);
QImage getCurrentImage();
protected:
void paintEvent(QPaintEvent *) override;
QSize sizeHint() const override;
@ -33,7 +36,9 @@ private:
unsigned int height_;
FormatConverter converter_;
QImage *image_;
QMutex mutex_; /* Prevent concurrent access to image_ */
};
#endif /* __QCAM_VIEWFINDER__ */