How can I use concurrency to generate an QImage

[JohannesMunk]

Hi!

Yeah.. the docs on the QtConcurrent stuff are really poor!

What you could do is store your float data together with the width and height value together in a small class, like so:

class FloatImage
{
public:
    FloatImage(QVector<const float*> data, int width, int height) : data(data),width(width),height(height) {}
    QVector<const float*> data;
    int width;
    int height;
    QImage toImage()
    {
       // Your code..
    }
};

class FloatImage
{
public:
    FloatImage(QVector<const float*> data, int width, int height) : data(data),width(width),height(height) {}
    QVector<const float*> data;
    int width;
    int height;
    QImage toImage()
    {
       // Your code..
    }
};

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You can call this with QtConcurrent::run

FloatImage fi(yourData,200,100);
QFutureSynchronizer<QImage> synchronizer;
synchronizer.addFuture( QtConcurrent::run(fi,&FloatImage::toImage));
...
synchronizer.waitForFinished();

FloatImage fi(yourData,200,100);
QFutureSynchronizer<QImage> synchronizer;
synchronizer.addFuture( QtConcurrent::run(fi,&FloatImage::toImage));
...
synchronizer.waitForFinished();

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This shows how to wait for multiple operations with QFutureSynchronizer!

HIH

Johannes