Photos poorly oriented when pulled from filepicker

In my application I allow users to take a photo or select an image using the filepicker. But when she shows the images in an imageView that they appear on the side and never in the correct position, no matter if they were taken without focus lock, or whatever. When I invoke the display of images, howeverm images are always perfectly oriented.

Is there anything I can do in my code to accommodate for this? Orientation is off differently isn't tlike it's always oritented left, sometimes it's to the right, sometimes it is upside down, sometimes it's to the left.

Hello

I know exactly what is happening - I'm working on an app photo from last year, and I had the same problem.

When the camera takes a photo, it adds some EXIF metadata in the JPEG file that indicates its "focus".

In my opinion, the BB should add an ImageView option such as "autoOrient" so that it would automatically read and the picture rotates as appropriate before posting, but I don't think such a property exists. Thus, all the developers who want to display pictures must add this logic to their App (inefficient or what?)

The good news is that there is a sample application that shows how to do this. Take a look at the sample application "photobomber.

I'll copy and paste the relevant code here:

QImage PhotoBomberApp::getRotateImage(const QString imageFilePath)
{
    //Load the image using QImage.
    QImage image = QImage(imageFilePath);

    ExifData *exifData = 0;
    ExifEntry *exifEntry = 0;
    int exifOrientation = 1;

    // Since the image will loose its exif data when its opened in a QImage
    // it has to be manually rotated according to the exif orientation.
    exifData = exif_data_new_from_file(imageFilePath.toLatin1().data());

    // Locate the orientation exif information.
    if (exifData != NULL) {
        for (int i = 0; i < EXIF_IFD_COUNT; i++) {
            exifEntry = exif_content_get_entry(exifData->ifd[i], EXIF_TAG_ORIENTATION);

            // If the entry corresponds to the orientation it will be a non zero pointer.
            if (exifEntry) {
                exifOrientation = exif_get_short(exifEntry->data, exif_data_get_byte_order(exifData));
                break;
            }
        }
    }

    // A transform will be used to rotate the image according to device and exif orientation.
    QTransform transform;

    qDebug() << "Exif data:" << exifOrientation;

    // It's a bit tricky to get the correct orientation of the image. A combination of
    // the way the the device is oriented and what the actual exif data says has to be used
    // in order to rotate it in the correct way.
    switch(exifOrientation) {
        case 1:
            // 0 degree rotation
            break;
        case 3:
            // 180 degree rotation
            transform.rotate(180);
            break;
        case 6:
            // 90 degree rotation
            transform.rotate(90);
            break;
        case 8:
            // 270 degree rotation
            transform.rotate(270);
            break;
        default:
            // Other orientations are mirrored orientations, do nothing.
            break;
    }

    // Perform the rotation of the image before its saved.
    image = image.transformed(transform);

    return image;
}

This code returns you a QImage, so you can or may not know how, then take that and display them in an ImageView. Incase it's useful, here's an example of my application relating to this code:

QImage thisQImage = getRotateImage(...);

bb::ImageData imageData = bb::ImageData::fromPixels(thisQImage.rgbSwapped().bits(), bb::PixelFormat::RGBX, thisQImage.width(), thisQImage.height(), thisQImage.bytesPerLine());

bb::cascades::Image cascadesImage = imageData;

imageView->setImage(cascadesImage);

A final caveat is that doing each of these conversions between types of image data takes a little time, and so if you do it in the main thread of the application, you might or might not slow down the user interface. I tried to move my loading image in another thread when it is possible, although I found (I think) the conversion in bb::cascades:Image does not work correctly if this isn't in the main thread, so I don't have this part and call setImage in the main thread.

Hope that helps. Here the answer was simpler.

Tags: BlackBerry Developers

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