Unable to view image of SVG format in Android

Pradeep Kumar

Hi,

I am using Android device to view the sample Apps, which is developed in Qt , version 5.7.
I am able to view image of .png and .jpeg format , but unable to view .svg format. And i am adding the image of respective format to QLabel.

And the image of svg format is not displaying.

sample code :
QFile file("./jpegFormat.svg"); // instead i give ./jpegFormat.jpeg or ./jpegFormat.png it will work
file.setPermissions(QFileDevice::ReadOwner | QFileDevice::WriteOwner);
file.open(QFile::ReadWrite);
file.write(responseData);
file.close();

QPixmap pixmap("./jpegFormat.svg"); // instead i give ./jpegFormat.jpeg or ./jpegFormat.png it will work

m_imageLabel->setPixmap(pixmap);

Guidance is required.
Thanks,

mrjj

Hi
Do you have

QT += svg

http://doc.qt.io/qt-5/qtsvg-index.html

Also , you can try the example
http://doc.qt.io/qt-5/qtsvg-svgviewer-example.html

? Offline

Hi! You cannot directly construct a pixmap from an SVG file. If you just want to show the SVG (as with QLabel for pixel graphics) use a QSvgWidget. If you want to rasterize the SVG by yourself then use QSvgRenderer to render the SVG via QPainter into a QImage or QPixmap.

Pradeep Kumar

Thanks for the solution guys @mrjj @Wieland
It worked.

Here is the sample code.

QFile file("./svgFormat.svg");
file.open(QFile::ReadWrite);
file.write(responseData);
file.close();

QSvgRenderer renderer(QString("./svgFormat.svg"));

QImage image(500, 200, QImage::Format_ARGB32);
image.fill(0xaaA08080);  

QPainter painter(&image);
renderer.render(&painter);

image.save("./svgFormat.png");

QPixmap pixmap("./svgFormat.png");
m_imageLabel->setPixmap(pixmap);

I am saving in .png format after that i am again reading the saved .png format and adding to QLabel.

? Offline

@Pradeep-Kumar Great to hear that it works now. Please mark the thread as solved :)

Pradeep Kumar

Yup i will mark as solved, so it will be useful.
Thanks & Cheers.

Pradeep Kumar

If we want to save in .svg format

here is the below code, this also works fine

QByteArray responseData = response->readAll();

QFile file("./svgFormat.svg");
file.open(QFile::ReadWrite);
file.write(responseData);
file.close();

QPixmap pixmap("./svgFormat.svg");
m_imageLabel->setPixmap(pixmap);

Another one which i posted earlier .

QFile file("./svgFormat.svg");
file.open(QFile::ReadWrite);
file.write(responseData);
file.close();

QSvgRenderer renderer(QString("./svgFormat.svg"));

QImage image(500, 200, QImage::Format_ARGB32);
image.fill(0xaaA08080);

QPainter painter(&image);
renderer.render(&painter);

image.save("./svgFormat.png");

QPixmap pixmap("./svgFormat.png");
m_imageLabel->setPixmap(pixmap);

I am saving in .png format after that i am again reading the saved .png format and adding to QLabel. Both the code works.

Pradeep Kumar

I just posted because i was again working on the same app. I made changes and observed the code which posted previous also was working.

So taught of posting once again , so it will be nice to share the contents.

As @mrjj said we need to include Qt += svg in pro file.