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#include "qgraphicspixmapoptimizeditem.h"
#include <QStyle>
#include <QPainter>
#include <QStyleOptionGraphicsItem>
#include <QImage>
#include <QDebug>


QGraphicsPixmapOptimizedItem::QGraphicsPixmapOptimizedItem()
        : QGraphicsPixmapItem()
{
    currImage = 0;
}


void QGraphicsPixmapOptimizedItem::setPixmap(const QPixmap &pixmap)
{
    QGraphicsPixmapItem::setPixmap(pixmap);
    if (currImage)
        delete currImage;
    currImage = new QImage(pixmap.toImage());
}

void QGraphicsPixmapOptimizedItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    Q_UNUSED(widget);

    painter->setRenderHint(QPainter::SmoothPixmapTransform,
                           (transformationMode() == Qt::SmoothTransformation));

    QRectF exposed = option->exposedRect.adjusted(-1, -1, 1, 1);
    exposed &= QRectF(offset().x(), offset().y(), currImage->width(), currImage->height());
    painter->drawImage(exposed, *currImage, exposed.translated(-offset()));
}

ViewImageWidget::ViewImageWidget(QWidget *parent) :
    QMainWindow(parent),
    m_ui(new Ui::ViewImageWidget)
{
    m_ui->setupUi(this);
    graphicsScene = new QGraphicsScene();
    m_ui->imageView->setScene(graphicsScene);
    m_ui->imageView->setDragMode(QGraphicsView::ScrollHandDrag);
    pixmapItem = new QGraphicsPixmapOptimizedItem();
    pixmapItem->setShapeMode(QGraphicsPixmapItem::BoundingRectShape);
    pixmapItem->setCacheMode(QGraphicsPixmapItem::DeviceCoordinateCache);
    pixmapItem->setTransformationMode(Qt::SmoothTransformation);
    graphicsScene->addItem(pixmapItem);
// ...
}

void ViewImageWidget::updateImage()
{
// ...
    ((QGraphicsPixmapOptimizedItem *)pixmapItem)->setPixmap(QPixmap(currImagePath));
    if (pixmapItem && (pixmapItem->pixmap().width() > m_ui->imageView->width() || pixmapItem->pixmap().height() > m_ui->imageView->height()))
        m_ui->imageView->fitInView(pixmapItem, Qt::KeepAspectRatio);
}

$ cat callgrind.out.5060.tar.bz2.part_aa.txt callgrind.out.5060.tar.bz2.part_ab.txt > callgrind.out.5060.tar.bz2 && tar -jxvf callgrind.out.5060.tar.bz2

bzip2: Data integrity error when decompressing.
        Input file = (stdin), output file = (stdout)

It is possible that the compressed file(s) have become corrupted.
You can use the -tvv option to test integrity of such files.

You can use the `bzip2recover' program to attempt to recover
data from undamaged sections of corrupted files.

tar: Child returned status 2
tar: Exiting with failure status due to previous errors