qvfb.cpp

Qt4.5 提供的qvfb,最新版本

}

void QVFb::skinConfigChosen(int i)
{
    if (i == config->skin->count() - 1) { // Browse... ?
        QFileDialog dlg(this);
        dlg.setFileMode(QFileDialog::DirectoryOnly);
        dlg.setWindowTitle(tr("Load Custom Skin..."));
        dlg.setFilter(tr("All QVFB Skins (*.skin)"));
        dlg.setDirectory(QDir::current());
        if (dlg.exec() && dlg.selectedFiles().count() == 1) {
            skinfiles.append(dlg.selectedFiles().first());
            i = skinfiles.count();
            config->skin->insertItem(i, QFileInfo(skinfiles.last()).baseName());
            config->skin->setCurrentIndex(i);
        } else {
            i = 0;
        }
    }
    if ( i ) {
	DeviceSkinParameters parameters;
	QString readError;
	if (parameters.read(skinfiles[i-1], DeviceSkinParameters::ReadSizeOnly, &readError)) {
	    chooseSize(parameters.screenSize());
            if (parameters.screenDepth)
                chooseDepth(parameters.screenDepth,QVFbView::ARGBFormat);
            config->touchScreen->setChecked(!parameters.hasMouseHover);
	} else {
	    qWarning("%s", qPrintable(readError));
	}
    }
}

void QVFb::setGamma400(int n)
{
    double g = n/100.0;
    view->setGamma(config->rslider->value()/100.0*g,
                   config->gslider->value()/100.0*g,
                   config->bslider->value()/100.0*g);
    updateGammaLabels();
}

void QVFb::setR400(int n)
{
    double g = n/100.0;
    view->setGamma(config->rslider->value()/100.0*g,
                   view->gammaGreen(),
                   view->gammaBlue());
    updateGammaLabels();
}

void QVFb::setG400(int n)
{
    double g = n/100.0;
    view->setGamma(view->gammaRed(),
                   config->gslider->value()/100.0*g,
                   view->gammaBlue());
    updateGammaLabels();
}

void QVFb::setB400(int n)
{
    double g = n/100.0;
    view->setGamma(view->gammaRed(),
                   view->gammaGreen(),
                   config->bslider->value()/100.0*g);
    updateGammaLabels();
}

void QVFb::updateGammaLabels()
{
    config->rlabel->setText(QString::number(view->gammaRed(),'g',2));
    config->glabel->setText(QString::number(view->gammaGreen(),'g',2));
    config->blabel->setText(QString::number(view->gammaBlue(),'g',2));
}

QSize QVFb::sizeHint() const
{
    return QSize(int(view->displayWidth()*view->zoomH()),
	    int(menuBar()->height()+view->displayHeight()*view->zoomV()));
}

// =====================================================================

AnimationSaveWidget::AnimationSaveWidget(QVFbAbstractView *v) :
	QWidget((QWidget*)0,0),
	view(v), recording(false), animation(0),
	timerId(-1), progressTimerId(-1),
	recOn(red_on_led_xpm), recOff(red_off_led_xpm),
	imageNum(0)
{
    // Create the animation record UI dialog
    QVBoxLayout *vlayout = new QVBoxLayout( this );

    QWidget *hbox = new QWidget( this );
    vlayout->addWidget(hbox);
    QHBoxLayout *hlayout = new QHBoxLayout(hbox);
    recBt = new QPushButton( tr("Record"), hbox );
    hlayout->addWidget(recBt);
    resetBt = new QPushButton( tr("Reset"), hbox );
    hlayout->addWidget(resetBt);
    saveBt = new QPushButton( tr("Save"), hbox );
    hlayout->addWidget(saveBt);
    recBt->setFixedWidth( 100 );
    resetBt->setFixedWidth( 100 );
    saveBt->setFixedWidth( 100 );
    timeDpy = new QLabel( "00:00", hbox );
    hlayout->addWidget(timeDpy);
    recLED = new QLabel( hbox );
    hlayout->addWidget(recLED);
    recLED->setPixmap( recOff );
    timeDpy->setMargin( 5 );
    connect( recBt, SIGNAL(clicked()), this, SLOT(toggleRecord()) );
    connect( resetBt, SIGNAL(clicked()), this, SLOT(reset()) );
    connect( saveBt, SIGNAL(clicked()), this, SLOT(save()) );
    elapsed = 0;
    vlayout->setMargin( 5 );
    vlayout->setSpacing( 5 );
    haveMpeg = detectPpmtoMpegCommand();
    mpegSave = new QCheckBox( tr("Save in MPEG format (requires netpbm package installed)"), this );
    vlayout->addWidget(mpegSave);
    mpegSave->setChecked( haveMpeg );
    mpegSave->setEnabled( haveMpeg );
    savingAsMpeg = haveMpeg;
    QWidget *hbox2 = new QWidget( this );
    vlayout->addWidget(hbox2);
    QHBoxLayout *hlayout2 = new QHBoxLayout( hbox2 );
    statusText = new QLabel( tr("Click record to begin recording."), hbox2 );
    hlayout2->addWidget(statusText);
    progressBar = new QProgressBar( hbox2 );
    progressBar->setValue( 0 );
    hlayout2->addWidget(progressBar);
    progressBar->hide();
}

AnimationSaveWidget::~AnimationSaveWidget()
{
    // clean up
    removeTemporaryFiles();
    delete animation;
}

// returns true if we have ppmtompeg command, else returns false
bool AnimationSaveWidget::detectPpmtoMpegCommand()
{
    // search the PATH for the ppmtompeg command to test we can record to mpeg
    QStringList paths = QString(::getenv("PATH")).split(":");
    for ( int i = 0; i < paths.count(); i++ )
	if ( QFile::exists( paths[i] + "/" + "ppmtompeg" ) )
	    return true;
    return false;
}

void AnimationSaveWidget::timerEvent( QTimerEvent *te )
{
    QString str;

    // Recording timer
    if ( te->timerId() == timerId ) {

	// Add a frame to the animation
	if ( savingAsMpeg && view )
	    view->image().save( str.sprintf("/tmp/qvfb_tmp_image_%04d.ppm", imageNum), "PPM");
	else if ( animation && view )
	    animation->appendFrame(view->image());//QPoint(0,0));
	imageNum++;

	// Update the display of number of seconds that have been recorded.
	int tmMsec = tm.elapsed();
	timeDpy->setText( str.sprintf("%02d:%02d", tmMsec/60000, (tmMsec%60000)/1000) );
	QObject::timerEvent( te );

	// Make the recording LED blink
	static int tick = 0;
	static bool on = false;
	if ( tick > 10 ) {
	    tick = 0;
	    if ( on )
		recLED->setPixmap( recOff );
	    else
		recLED->setPixmap( recOn );
	    on = !on;
	}
	tick++;
    }

    // Saving progress timer
    if ( te->timerId() == progressTimerId ) {
	// Parse output log file to work out the encoding progress.
	QFile f("/tmp/qvfb_tmp_output.log");
	f.open(QIODevice::ReadOnly);
	int largestNum = 0;
	bool done = false;
	char buffer[1024];
	while ( !f.atEnd() ) {
	    // example of the output log entries
	    //   During each frame:
	    //      "FRAME 764 (B):  I BLOCKS:  0......
	    //   When complete:
	    //      "======FRAMES READ:  766"
	    f.readLine(buffer, 1024);
	    str = QString(buffer);
	    if ( str.left(6) == "FRAME " ) {
		int num = str.mid(6, str.indexOf(QChar(' '), 6) - 6).toInt();
		if ( num > largestNum )
		    largestNum = num;
	    } else if ( str.left(18) == "======FRAMES READ:" ) {
		done = true;
	    }
	}
	f.close();

	// Update the progress bar with the frame we are up to
	progressBar->setValue( largestNum );

	// Finished saving
	if ( done ) {
	    progressBar->hide();
	    statusText->setText( tr("Finished saving."));
	    removeTemporaryFiles();
	    killTimer( progressTimerId );
	    progressTimerId = -1;
	    reset();
	}
    }
}

// Takes the saved ppm files and converts them to a mpeg file named filename
void AnimationSaveWidget::convertToMpeg(QString filename)
{
    recLED->setPixmap( recOff );
    killTimer( timerId );

    progressBar->show();
    progressBar->setRange( 0, imageNum );
    progressBar->setValue( 0 );

    // Build parameter file required by ppmtompeg
    QFile file("/tmp/qvfb_tmp_ppmtompeg.params");
    if ( file.open( QIODevice::WriteOnly ) ) {
	QTextStream t( &file );
	t << "PATTERN IBBPBBPBBPBBPBB\n";
	t << "OUTPUT " << filename << "\n";
	t << "INPUT_DIR /tmp\n";
	t << "INPUT\n";
	QString str;
	str = str.sprintf("%04d", imageNum - 1);
	t << "qvfb_tmp_image_*.ppm [0000-" << str << "]\n";
	t << "END_INPUT\n";
	t << "BASE_FILE_FORMAT PPM\n";
	t << "INPUT_CONVERT *\n";
	t << "GOP_SIZE 15\n";
	t << "SLICES_PER_FRAME 1\n";
	t << "PIXEL HALF\n";
	t << "RANGE 5\n";
	t << "PSEARCH_ALG LOGARITHMIC\n";
	t << "BSEARCH_ALG SIMPLE\n";
	t << "IQSCALE 1\n";
	t << "PQSCALE 1\n";
	t << "BQSCALE 1\n";
	t << "REFERENCE_FRAME DECODED\n";
	t << "ASPECT_RATIO 1\n";
	t << "FRAME_RATE 24\n";
	t << "BIT_RATE 64000\n";	    // Quality
	t << "BUFFER_SIZE 2048\n";
    }
    file.close();

    // ### can't use QProcess, not in Qt 2.3
    // ### but it's certainly in Qt 4! use it?
    // Execute the ppmtompeg command as a seperate process to do the encoding
    pid_t pid = ::fork();
    if ( !pid ) {
	// Child process
	// redirect stdout to log file
	freopen("/tmp/qvfb_tmp_output.log", "w", stdout);
	// ppmtompeg tool is from the netpbm package
	::execlp("ppmtompeg", "ppmtompeg", "/tmp/qvfb_tmp_ppmtompeg.params", (void *)0);
	exit(0);
    }

    // Update the saving progress bar every 200ms
    progressTimerId = startTimer( 200 );
}

// Cleanup temporary files created during creating a mpeg file
void AnimationSaveWidget::removeTemporaryFiles()
{
    QString str;
    for ( int i = 0; i < imageNum; i++ )
	QFile::remove( str.sprintf("/tmp/qvfb_tmp_image_%04d.ppm", i) );
    QFile::remove("/tmp/qvfb_tmp_ppmtompeg.params");
    QFile::remove("/tmp/qvfb_tmp_output.log");
    imageNum = 0;
}

// toggles between recording and paused (usually when record button clicked)
void AnimationSaveWidget::toggleRecord()
{
    if ( recording ) {
	recLED->setPixmap( recOff );
	recBt->setText( tr("Record") );
	statusText->setText( tr("Paused. Click record to resume, or save if done."));
	killTimer( timerId );
	timerId = -1;
	elapsed = tm.elapsed();
    } else {
	recLED->setPixmap( recOn );
	recBt->setText( tr("Pause") );
	statusText->setText( tr("Recording..."));
	tm.start();
	if ( elapsed == 0 ) {
	    savingAsMpeg = mpegSave->isChecked();
	    if ( !savingAsMpeg ) {
		delete animation;
		animation = new QAnimationWriter("/tmp/qvfb_tmp_animation.mng","MNG");
		animation->setFrameRate(24);
		if ( view )
		    animation->appendFrame(view->image());
	    }
	}
	tm = tm.addMSecs(-elapsed);
	elapsed = 0;
	timerId = startTimer(1000 / 24);
    }
    recording = !recording;
}

// Reset everything to initial state of not recording
void AnimationSaveWidget::reset()
{
    if ( recording ) {
	toggleRecord();
	statusText->setText( tr("Click record to begin recording."));
	removeTemporaryFiles();
    }
    progressBar->setValue( 0 );
    timeDpy->setText( "00:00" );
    elapsed = 0;
    imageNum = 0;
    delete animation;
    animation = 0;
}

// Prompt for filename to save to and put animation in that file
void AnimationSaveWidget::save()
{
    if ( recording )
	toggleRecord(); // pauses
    statusText->setText( tr("Saving... "));

    QString filename;
    if ( savingAsMpeg ) {
	filename = QFileDialog::getSaveFileName(this, tr("Save animation..."), "", "*.mpg");
	if ( !filename.isNull() )
	    convertToMpeg(filename);
    } else {
	filename = QFileDialog::getSaveFileName(this, tr("Save animation..."), "", "*.mng");
	if (filename.isNull()) {
            statusText->setText(tr("Save canceled."));
        } else {
            QFile::remove(filename);
            bool success = QFile::rename(QLatin1String("/tmp/qvfb_tmp_animation.mng"),
                                         filename);
            if (success) {
                statusText->setText(tr("Finished saving."));
                reset();
            } else {
                statusText->setText(tr("Save failed!"));
            }
	}
    }
}

QT_END_NAMESPACE

#include "qvfb.moc"