source: trunk/tools/qttracereplay/main.cpp@ 846

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#include <QtGui>
#include <QtDebug>

#include <private/qpaintengineex_p.h>
#include <private/qpaintbuffer_p.h>

class ReplayWidget : public QWidget
{
    Q_OBJECT
public:
    ReplayWidget(const QString &filename, int from, int to, bool single, int frame);

    void paintEvent(QPaintEvent *event);
    void resizeEvent(QResizeEvent *event);

public slots:
    void updateRect();

public:
    QList<QRegion> updates;
    QPaintBuffer buffer;

    int currentFrame;
    int currentIteration;
    QTime timer;

    QList<uint> visibleUpdates;

    QVector<uint> iterationTimes;
    QString filename;

    int from;
    int to;

    bool single;

    int frame;
    int currentCommand;
};

void ReplayWidget::updateRect()
{
    if (frame >= 0 && !updates.isEmpty())
        update(updates.at(frame));
    else if (!visibleUpdates.isEmpty())
        update(updates.at(visibleUpdates.at(currentFrame)));
}

const int singleFrameRepeatsPerCommand = 100;
const int singleFrameIterations = 4;

void ReplayWidget::paintEvent(QPaintEvent *)
{
    QPainter p(this);

    QTimer::singleShot(0, this, SLOT(updateRect()));

//    p.setClipRegion(frames.at(currentFrame).updateRegion);

    if (frame >= 0) {
        int start = buffer.frameStartIndex(frame);
        int end = buffer.frameEndIndex(frame);

        iterationTimes.resize(end - start);

        int saveRestoreStackDepth = buffer.processCommands(&p, start, start + currentCommand);

        for (int i = 0; i < saveRestoreStackDepth; ++i)
            p.restore();

        const int repeats = currentIteration >= 3 ? singleFrameRepeatsPerCommand : 1;

        ++currentFrame;
        if (currentFrame == repeats) {
            currentFrame = 0;
            if (currentIteration >= 3) {
                iterationTimes[currentCommand - 1] = qMin(iterationTimes[currentCommand - 1], uint(timer.elapsed()));
                timer.restart();
            }

            if (currentIteration >= singleFrameIterations + 3) {
                printf(" #    | ms      | description\n");
                printf("------+---------+------------------------------------------------------------\n");

                qSort(iterationTimes);

                int sum = 0;
                for (int i = 0; i < iterationTimes.size(); ++i) {
                    int delta = iterationTimes.at(i);
                    if (i > 0)
                        delta -= iterationTimes.at(i-1);
                    sum += delta;
                    qreal deltaF = delta / qreal(repeats);
                    printf("%.5d | %.5f | %s\n", i, deltaF, qPrintable(buffer.commandDescription(start + i)));
                }
                printf("Total | %.5f | Total frame time\n", sum / qreal(repeats));
                deleteLater();
                return;
            }

            if (start + currentCommand >= end) {
                currentCommand = 1;
                ++currentIteration;
                if (currentIteration == 3) {
                    timer.start();
                    iterationTimes.fill(uint(-1));
                }
                if (currentIteration >= 3 && currentIteration < singleFrameIterations + 3)
                    printf("Profiling iteration %d of %d\n", currentIteration - 2, singleFrameIterations);
            } else {
                ++currentCommand;
            }
        }

        return;
    }

    buffer.draw(&p, visibleUpdates.at(currentFrame));

    ++currentFrame;