saveSnapshot.cpp

/****************************************************************************

 Copyright (C) 2002-2008 Gilles Debunne. All rights reserved.

 This file is part of the QGLViewer library version 2.3.10.

 http://www.libqglviewer.com - contact@libqglviewer.com

 This file may be used under the terms of the GNU General Public License 
 versions 2.0 or 3.0 as published by the Free Software Foundation and
 appearing in the LICENSE file included in the packaging of this file.
 In addition, as a special exception, Gilles Debunne gives you certain 
 additional rights, described in the file GPL_EXCEPTION in this package.

 libQGLViewer uses dual licensing. Commercial/proprietary software must
 purchase a libQGLViewer Commercial License.

 This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

*****************************************************************************/

#include "qglviewer.h"

#ifndef NO_VECTORIAL_RENDER
# if QT_VERSION >= 0x040000
#  include "ui_VRenderInterface.Qt4.h"
# else
#  include <qcheckbox.h>
#  include <qcombobox.h>
#  include "VRenderInterface.Qt3.h"
# endif
# include "VRender/VRender.h"
#endif

#if QT_VERSION >= 0x040000
# include "ui_ImageInterface.Qt4.h"
#else
# include <qspinbox.h>
# include <qcheckbox.h>
# include "ImageInterface.Qt3.h"
#endif

// Output format list
#if QT_VERSION < 0x040000
# include <qimage.h>
#else
# include <QImageWriter>
#endif

#include <qfileinfo.h>
#include <qfiledialog.h>
#include <qmessagebox.h>
#include <qapplication.h>
#include <qmap.h>
#include <qinputdialog.h>
#include <qprogressdialog.h>
#include <qcursor.h>

using namespace std;

// List of available output file formats, formatted for QFileDialog.
static QString formats;
// Converts QFileDialog resulting format to Qt snapshotFormat.
static QMap<QString, QString> Qtformat;
// Converts Qt snapshotFormat to QFileDialog menu string.
static QMap<QString, QString> FDFormatString;
// Converts snapshotFormat to file extension
static QMap<QString, QString> extension;


void QGLViewer::setSnapshotFileName(const QString& name)
{
#if QT_VERSION >= 0x040000
  snapshotFileName_ = QFileInfo(name).absoluteFilePath();
#else
  snapshotFileName_ = QFileInfo(name).absFilePath();
#endif
}

#ifndef DOXYGEN
const QString& QGLViewer::snapshotFilename() const
{
  qWarning("snapshotFilename is deprecated. Use snapshotFileName() (uppercase N) instead.");
  return snapshotFileName();
}
#endif


bool QGLViewer::openSnapshotFormatDialog()
{
  bool ok = false;
#if QT_VERSION >= 0x040000
  QStringList list = formats.split(";;", QString::SkipEmptyParts);
  int current = list.indexOf(FDFormatString[snapshotFormat()]);
  QString format = QInputDialog::getItem(this, "Snapshot format", "Select a snapshot format", list, current, false, &ok);
#else
  QStringList list = QStringList::split(";;", formats);
  int current = list.findIndex(FDFormatString[snapshotFormat()]);
  QString format = QInputDialog::getItem("Snapshot format", "Select a snapshot format", list, current, false, &ok, this);
#endif
  if (ok)
    setSnapshotFormat(Qtformat[format]);
  return ok;
}


// Finds all available Qt output formats, so that they can be available in
// saveSnapshot dialog. Initialize snapshotFormat() to the first one.
void QGLViewer::initializeSnapshotFormats()
{
#if QT_VERSION >= 0x040000
  QList<QByteArray> list = QImageWriter::supportedImageFormats();
  QStringList formatList;
  for (int i=0; i < list.size(); ++i)
    formatList << QString(list.at(i).toUpper());
#else
  QStringList formatList = QImage::outputFormatList();
#endif
  //        qWarning("Available image formats: ");
  //        QStringList::Iterator it = formatList.begin();
  //        while( it != formatList.end() )
  //          qWarning((*it++).);  QT4 change this. qWarning no longer accepts QString

#ifndef NO_VECTORIAL_RENDER
  // We add the 3 vectorial formats to the list
  formatList += "EPS";
  formatList += "PS";
  formatList += "XFIG";
#endif

  // Check that the interesting formats are available and add them in "formats"
  // Unused formats: XPM XBM PBM PGM
  QStringList QtText, MenuText, Ext;
  QtText += "JPEG"; MenuText += "JPEG (*.jpg)";     Ext += "jpg";
  QtText += "PNG";  MenuText += "PNG (*.png)";      Ext += "png";
  QtText += "EPS";  MenuText += "Encapsulated Postscript (*.eps)";  Ext += "eps";
  QtText += "PS";   MenuText += "Postscript (*.ps)";    Ext += "ps";
  QtText += "PPM";  MenuText += "24bit RGB Bitmap (*.ppm)"; Ext += "ppm";
  QtText += "BMP";  MenuText += "Windows Bitmap (*.bmp)";   Ext += "bmp";
  QtText += "XFIG"; MenuText += "XFig (*.fig)";     Ext += "fig";

#if QT_VERSION < 0x030000
  QStringList::Iterator itText = QtText.begin();
  QStringList::Iterator itMenu = MenuText.begin();
  QStringList::Iterator itExt  = Ext.begin();
#else
  QStringList::iterator itText = QtText.begin();
  QStringList::iterator itMenu = MenuText.begin();
  QStringList::iterator itExt  = Ext.begin();
#endif
  while (itText != QtText.end())
    {
      //QMessageBox::information(this, "Snapshot ", "Trying format\n"+(*itText));
      if (formatList.contains((*itText)))
    {
      //QMessageBox::information(this, "Snapshot ", "Recognized format\n"+(*itText));
      if (formats.isEmpty())
        setSnapshotFormat(*itText);
      else
        formats += ";;";
      formats += (*itMenu);
      Qtformat[(*itMenu)]  = (*itText);
      FDFormatString[(*itText)]  = (*itMenu);
      extension[(*itText)] = (*itExt);
    }
      // Synchronize parsing
      itText++;
      itMenu++;
      itExt++;
    }
}

// Returns false if the user refused to use the fileName
static bool checkFileName(QString& fileName, QWidget* widget, const QString& snapshotFormat)
{
  if (fileName.isEmpty())
    return false;

  // Check that extension has been provided
  QFileInfo info(fileName);

#if QT_VERSION >= 0x040000
  if (info.suffix().isEmpty())
#else
  if (info.extension(false).isEmpty())
#endif
    {
      // No extension given. Silently add one
      if (fileName.right(1) != ".")
    fileName += ".";
      fileName += extension[snapshotFormat];
      info.setFile(fileName);
    }
#if QT_VERSION >= 0x040000
  else if (info.suffix() != extension[snapshotFormat])
#else
  else if (info.extension(false) != extension[snapshotFormat])
#endif
    {
      // Extension is not appropriate. Propose a modification
#if QT_VERSION >= 0x040000
      QString modifiedName = info.absolutePath() + '/' + info.baseName() + "." + extension[snapshotFormat];
#else
# if QT_VERSION >= 0x030000
      QString modifiedName = info.dirPath() + '/' + info.baseName(true) + '.' + extension[snapshotFormat];
# else
      QString modifiedName = info.dirPath() + '/' + info.baseName() + '.' + extension[snapshotFormat];
# endif
#endif
      QFileInfo modifInfo(modifiedName);
      int i=(QMessageBox::warning(widget,"Wrong extension",
                  info.fileName()+" has a wrong extension.\nSave as "+modifInfo.fileName()+" instead ?",
                  QMessageBox::Yes,
                  QMessageBox::No,
                  QMessageBox::Cancel));
      if (i==QMessageBox::Cancel)
    return false;

      if (i==QMessageBox::Yes)
    {
      fileName = modifiedName;
      info.setFile(fileName);
    }
    }

  return true;
}

#ifndef NO_VECTORIAL_RENDER
// static void drawVectorial(void* param)
void drawVectorial(void* param)
{
  ( (QGLViewer*) param )->drawVectorial();
}

#ifndef DOXYGEN
class ProgressDialog
{
public:
  static void showProgressDialog(QGLWidget* parent);
  static void updateProgress(float progress, const QString& stepString);
  static void hideProgressDialog();

private:
  static QProgressDialog* progressDialog;
};

QProgressDialog* ProgressDialog::progressDialog = NULL;

void ProgressDialog::showProgressDialog(QGLWidget* parent)
{
  progressDialog = new QProgressDialog(parent);
#if QT_VERSION >= 0x040000
  progressDialog->setWindowTitle("Image rendering progress");
#else
  progressDialog->setCaption("Image rendering progress");
#endif
  progressDialog->setMinimumSize(300, 40);
  progressDialog->setCancelButton(NULL);
  progressDialog->show();
}

void ProgressDialog::updateProgress(float progress, const QString& stepString)
{
#if QT_VERSION >= 0x040000
  progressDialog->setValue(int(progress*100));
#else
  progressDialog->setProgress(int(progress*100));
#endif
  QString message(stepString);
  if (message.length() > 33)
    message = message.left(17) + "..." + message.right(12);
  progressDialog->setLabelText(message);
  progressDialog->update();
  qApp->processEvents();
}

void ProgressDialog::hideProgressDialog()
{
  progressDialog->close();
  delete progressDialog;
  progressDialog = NULL;
}

#if QT_VERSION >= 0x040000
class VRenderInterface: public QDialog, public Ui::VRenderInterface
{
 public: VRenderInterface(QWidget *parent) : QDialog(parent) { setupUi(this); }
};
#endif

#endif

// Pops-up a vectorial output option dialog box and save to fileName
// Returns -1 in case of Cancel, 0 for success and (todo) error code in case of problem.
static int saveVectorialSnapshot(const QString& fileName, QGLWidget* widget, const QString& snapshotFormat)
{
  static VRenderInterface* VRinterface = NULL;

  if (!VRinterface)
#if QT_VERSION >= 0x030000
    VRinterface = new VRenderInterface(widget);
#else
    VRinterface = new VRenderInterface(widget, "", true); // Make the dialog modal
#endif

  
  // Configure interface according to selected snapshotFormat
  if (snapshotFormat == "XFIG")
    {
      VRinterface->tightenBBox->setEnabled(false);
      VRinterface->colorBackground->setEnabled(false);
    }
  else
    {
      VRinterface->tightenBBox->setEnabled(true);
      VRinterface->colorBackground->setEnabled(true);
    }

  if (VRinterface->exec() == QDialog::Rejected)
    return -1;

  vrender::VRenderParams vparams;
  vparams.setFilename(fileName);

  if (snapshotFormat == "EPS")  vparams.setFormat(vrender::VRenderParams::EPS);
  if (snapshotFormat == "PS")   vparams.setFormat(vrender::VRenderParams::PS);
  if (snapshotFormat == "XFIG") vparams.setFormat(vrender::VRenderParams::XFIG);

  vparams.setOption(vrender::VRenderParams::CullHiddenFaces, !(VRinterface->includeHidden->isChecked()));
  vparams.setOption(vrender::VRenderParams::OptimizeBackFaceCulling, VRinterface->cullBackFaces->isChecked());
  vparams.setOption(vrender::VRenderParams::RenderBlackAndWhite, VRinterface->blackAndWhite->isChecked());
  vparams.setOption(vrender::VRenderParams::AddBackground, VRinterface->colorBackground->isChecked());
  vparams.setOption(vrender::VRenderParams::TightenBoundingBox, VRinterface->tightenBBox->isChecked());

#if QT_VERSION >= 0x040000
  switch (VRinterface->sortMethod->currentIndex())
#else
  switch (VRinterface->sortMethod->currentItem())
#endif
    {
    case 0: vparams.setSortMethod(vrender::VRenderParams::NoSorting);       break;
    case 1: vparams.setSortMethod(vrender::VRenderParams::BSPSort);         break;
    case 2: vparams.setSortMethod(vrender::VRenderParams::TopologicalSort);     break;
    case 3: vparams.setSortMethod(vrender::VRenderParams::AdvancedTopologicalSort); break;
    default:
      qWarning("VRenderInterface::saveVectorialSnapshot: Unknown SortMethod");
    }

  vparams.setProgressFunction(&ProgressDialog::updateProgress);
  ProgressDialog::showProgressDialog(widget);
  widget->makeCurrent();
  widget->raise();
  vrender::VectorialRender(drawVectorial, (void*) widget, vparams);
  ProgressDialog::hideProgressDialog();
#if QT_VERSION < 0x030000
  widget->setCursor(Qt::arrowCursor);
#else
  widget->setCursor(QCursor(Qt::ArrowCursor));
#endif

  // Should return vparams.error(), but this is currently not set.
  return 0;
}
#endif // NO_VECTORIAL_RENDER


#if QT_VERSION >= 0x040000
class ImageInterface: public QDialog, public Ui::ImageInterface
{
 public: ImageInterface(QWidget *parent) : QDialog(parent) { setupUi(this); }
};
#endif


// Pops-up an image settings dialog box and save to fileName.
// Returns false in case of problem.
bool QGLViewer::saveImageSnapshot(const QString& fileName)
{
  static ImageInterface* imageInterface = NULL;

  if (!imageInterface)
#if QT_VERSION >= 0x030000
    imageInterface = new ImageInterface(this);
#else
    imageInterface = new ImageInterface(this, "", true);  // Make the dialog modal
#endif

  // 1 means never set : use current window size as default
  if ((imageInterface->imgWidth->value() == 1) && (imageInterface->imgHeight->value() == 1))
    {
      imageInterface->imgWidth->setValue(width());
      imageInterface->imgHeight->setValue(height());
    }

  imageInterface->imgQuality->setValue(snapshotQuality());

  if (imageInterface->exec() == QDialog::Rejected)
    return true;

  // Hide closed dialog
  qApp->processEvents();
  
  setSnapshotQuality(imageInterface->imgQuality->value());
  
  QColor previousBGColor = backgroundColor();
  if (imageInterface->whiteBackground->isChecked())
    setBackgroundColor(Qt::white);

  QSize finalSize(imageInterface->imgWidth->value(), imageInterface->imgHeight->value());

  double oversampling = imageInterface->oversampling->value();
  QSize subSize(int(this->width()/oversampling), int(this->height()/oversampling));

  double aspectRatio = width() / static_cast<double>(height());
  double newAspectRatio = finalSize.width() / static_cast<double>(finalSize.height());

  double zNear = camera()->zNear();
  double zFar = camera()->zFar();

  double xMin, yMin;
  bool expand = imageInterface->expandFrustum->isChecked();
  if (camera()->type() == qglviewer::Camera::PERSPECTIVE)
    if ((expand && (newAspectRatio>aspectRatio)) || (!expand && (newAspectRatio<aspectRatio)))
      {
    yMin = zNear * tan(camera()->fieldOfView() / 2.0);
    xMin = newAspectRatio * yMin;
      }
    else
      {
    xMin = zNear * tan(camera()->fieldOfView() / 2.0) * aspectRatio;
    yMin = xMin / newAspectRatio;
      }
  else
    {
      camera()->getOrthoWidthHeight(xMin, yMin);
      if ((expand && (newAspectRatio>aspectRatio)) || (!expand && (newAspectRatio<aspectRatio)))
    xMin = newAspectRatio * yMin;
      else
    yMin = xMin / newAspectRatio;
    }
  
#if QT_VERSION >= 0x040000
  QImage image(finalSize.width(), finalSize.height(), QImage::Format_ARGB32);
#else
  QImage image(finalSize.width(), finalSize.height(), 32);
#endif

  if (image.isNull())
    {
      QMessageBox::warning(this, "Image saving error",
               "Unable to create resulting image",
               QMessageBox::Ok, QMessageBox::NoButton);
      return false;
    }

  // ProgressDialog disabled since it interfers with the screen grabing mecanism on some platforms. Too bad.
  // ProgressDialog::showProgressDialog(this);

  double scaleX = subSize.width() / static_cast<double>(finalSize.width());
  double scaleY = subSize.height() / static_cast<double>(finalSize.height());

  double deltaX = 2.0 * xMin * scaleX;
  double deltaY = 2.0 * yMin * scaleY;

  int nbX = finalSize.width() / subSize.width();
  int nbY = finalSize.height() / subSize.height();

  // Extra subimage on the right/bottom border(s) if needed
  if (nbX * subSize.width() < finalSize.width())
    nbX++;
  if (nbY * subSize.height() < finalSize.height())
    nbY++;

  makeCurrent();

  // tileRegion_ is used by startScreenCoordinatesSystem to appropriately set the local
  // coordinate system when tiling
  tileRegion_ = new TileRegion();
  double tileXMin, tileWidth, tileYMin, tileHeight;
  if ((expand && (newAspectRatio>aspectRatio)) || (!expand && (newAspectRatio<aspectRatio)))
    {
      double tileTotalWidth = newAspectRatio * height();
      tileXMin = (width() - tileTotalWidth) / 2.0;
      tileWidth = tileTotalWidth * scaleX;
      tileYMin = 0.0;
      tileHeight = height() * scaleY;
      tileRegion_->textScale = 1.0 / scaleY;
    }
  else
    {
      double tileTotalHeight = width() / newAspectRatio;
      tileYMin = (height() - tileTotalHeight) / 2.0;
      tileHeight = tileTotalHeight * scaleY;
      tileXMin = 0.0;
      tileWidth = width() * scaleX;
      tileRegion_->textScale = 1.0 / scaleX;
    }

  int count=0;
  for (int i=0; i<nbX; i++)
    for (int j=0; j<nbY; j++)
      {
    preDraw();

    // Change projection matrix
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    if (camera()->type() == qglviewer::Camera::PERSPECTIVE)
      glFrustum(-xMin + i*deltaX, -xMin + (i+1)*deltaX, yMin - (j+1)*deltaY, yMin - j*deltaY, zNear, zFar);
    else
      glOrtho(-xMin + i*deltaX, -xMin + (i+1)*deltaX, yMin - (j+1)*deltaY, yMin - j*deltaY, zNear, zFar);
    glMatrixMode(GL_MODELVIEW);

    tileRegion_->xMin = tileXMin + i * tileWidth;
    tileRegion_->xMax = tileXMin + (i+1) * tileWidth;
    tileRegion_->yMin = tileYMin + j * tileHeight;
    tileRegion_->yMax = tileYMin + (j+1) * tileHeight;

    draw();
    postDraw();

    // ProgressDialog::hideProgressDialog();
    // qApp->processEvents();

    QImage snapshot = grabFrameBuffer(true);

    // ProgressDialog::showProgressDialog(this);
    // ProgressDialog::updateProgress(count / (float)(nbX*nbY),
    // "Generating image ["+QString::number(count)+"/"+QString::number(nbX*nbY)+"]");
    // qApp->processEvents();

#if QT_VERSION >= 0x040000
    QImage subImage = snapshot.scaled(subSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
#else
# if QT_VERSION >= 0x030000
    QImage subImage = snapshot.scale(subSize, QImage::ScaleFree);
# else
    QImage subImage = snapshot.smoothScale(subSize.width(), subSize.height());
# endif
#endif

    // Copy subImage in image
    for (int ii=0; ii<subSize.width(); ii++)
      {
        int fi = i*subSize.width() + ii;
        if (fi == image.width())
          break;
        for (int jj=0; jj<subSize.height(); jj++)
          {
        int fj = j*subSize.height() + jj;
        if (fj == image.height())
          break;
        image.setPixel(fi, fj, subImage.pixel(ii,jj));
          }
      }
    count++;
      }
  
#if QT_VERSION >= 0x040000
  bool saveOK = image.save(fileName, snapshotFormat().toLatin1().constData(), snapshotQuality());
#else
  bool saveOK = image.save(fileName, snapshotFormat(), snapshotQuality());
#endif

  // ProgressDialog::hideProgressDialog();

  // #if QT_VERSION < 0x030000
  // setCursor(Qt::arrowCursor);
  // #else
  // setCursor(QCursor(Qt::ArrowCursor));
  // #endif

  delete tileRegion_;
  tileRegion_ = NULL;

  if (imageInterface->whiteBackground->isChecked())
    setBackgroundColor(previousBGColor);

  return saveOK;
}


void QGLViewer::saveSnapshot(bool automatic, bool overwrite)
{
  // Ask for file name
  if (snapshotFileName().isEmpty() || !automatic)
    {
      QString fileName;
#if QT_VERSION < 0x030000
      if (openSnapshotFormatDialog())
        fileName = QFileDialog::getSaveFileName(snapshotFileName(), FDFormatString[snapshotFormat()]+";;All files (*.*)", this, "Save dialog");
      else
        return;
#else
      QString selectedFormat = FDFormatString[snapshotFormat()];
# if QT_VERSION >= 0x040000
      fileName = QFileDialog::getSaveFileName(this, "Choose a file name to save under", snapshotFileName(), formats, &selectedFormat,
                          overwrite?QFileDialog::DontConfirmOverwrite:QFlag(0));
# else
      fileName = QFileDialog::getSaveFileName(snapshotFileName(), formats, this,
                          "Save Snapshot dialog", "Choose a file name to save under", &selectedFormat);
# endif
      setSnapshotFormat(Qtformat[selectedFormat]);
#endif

      if (checkFileName(fileName, this, snapshotFormat()))
    setSnapshotFileName(fileName);
      else
    return;
    }

  QFileInfo fileInfo(snapshotFileName());

  if ((automatic) && (snapshotCounter() >= 0))
    {
      // In automatic mode, names have a number appended
      const QString baseName = fileInfo.baseName();
      QString count;
      count.sprintf("%.04d", snapshotCounter_++);
      QString suffix;
#if QT_VERSION >= 0x040000
      suffix = fileInfo.suffix();
      if (suffix.isEmpty())
    suffix = extension[snapshotFormat()];
      fileInfo.setFile(fileInfo.absolutePath()+ '/' + baseName + '-' + count + '.' + suffix);
#else      
      suffix = fileInfo.extension();
      if (suffix.isEmpty())
    suffix = extension[snapshotFormat()];
      fileInfo.setFile(fileInfo.dirPath()+ '/' + baseName + '-' + count + '.' + suffix);
#endif

      if (!overwrite)
    while (fileInfo.exists())
      {
        count.sprintf("%.04d", snapshotCounter_++);
#if QT_VERSION >= 0x040000
        fileInfo.setFile(fileInfo.absolutePath() + '/' +baseName + '-' + count + '.' + fileInfo.suffix());
#else
        fileInfo.setFile(fileInfo.dirPath() + '/' + baseName + '-' + count + '.' + fileInfo.extension());
#endif
      }
    }

#if QT_VERSION < 0x040000
  if ((fileInfo.exists()) && (!overwrite) &&
      (QMessageBox::warning(this,"Overwrite file ?",
                "File "+fileInfo.fileName()+" already exists.\nOverwrite ?",
                QMessageBox::Yes,
                QMessageBox::Cancel) == QMessageBox::Cancel))
      return;
#endif
  
  bool saveOK;
#ifndef NO_VECTORIAL_RENDER
  if ( (snapshotFormat() == "EPS") || (snapshotFormat() == "PS") || (snapshotFormat() == "XFIG") )
      // Vectorial snapshot. -1 means cancel, 0 is ok, >0 (should be) an error
      saveOK = (saveVectorialSnapshot(fileInfo.filePath(), this, snapshotFormat()) <= 0);
  else
#endif
    if (automatic)
    {
      QImage snapshot = frameBufferSnapshot();
#if QT_VERSION >= 0x040000
    saveOK = snapshot.save(fileInfo.filePath(), snapshotFormat().toLatin1().constData(), snapshotQuality());
#else
    saveOK = snapshot.save(fileInfo.filePath(), snapshotFormat(), snapshotQuality());
#endif
    }
    else
      saveOK = saveImageSnapshot(fileInfo.filePath());

  if (!saveOK)
    QMessageBox::warning(this, "Snapshot problem", "Unable to save snapshot in\n"+fileInfo.filePath());
}

QImage QGLViewer::frameBufferSnapshot()
{
      // Viewer must be on top of other windows.
      makeCurrent();
      raise();
      // Hack: Qt has problems if the frame buffer is grabbed after QFileDialog is displayed.
      // We grab the frame buffer before, even if it might be not necessary (vectorial rendering).
      // The problem could not be reproduced on a simple example to submit a Qt bug.
      // However, only grabs the backgroundImage in the eponym example. May come from the driver.
      return grabFrameBuffer(true);
}

void QGLViewer::saveSnapshot(const QString& fileName, bool overwrite)
{
  const QString previousName = snapshotFileName();
  const int previousCounter = snapshotCounter();
  setSnapshotFileName(fileName);
  setSnapshotCounter(-1);
  saveSnapshot(true, overwrite);
  setSnapshotFileName(previousName);
  setSnapshotCounter(previousCounter);
}

void QGLViewer::snapshotToClipboard()
{
    QClipboard *cb = QApplication::clipboard();
    cb->setImage(frameBufferSnapshot()); 
}

#if QT_VERSION < 0x030000
// This code is largely inspired from Qt's method available in version 3
// Copyright Trolltech AS
QImage QGLViewer::grabFrameBuffer(bool withAlpha)
{
  makeCurrent();
  QImage res;
  int w = width();
  int h = height();
  if (format().rgba())
  {
    res = QImage(w, h, 32);
    glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, res.bits());
    if (QImage::systemByteOrder() == QImage::BigEndian)
    {
      // OpenGL gives RGBA; Qt wants ARGB
      uint *p = (uint*)res.bits();
      uint *end = p + w*h;
      if (withAlpha && format().alpha())
      {
        while (p < end)
        {
          uint a = *p << 24;
          *p = (*p >> 8) | a;
          p++;
        }
      }
      else
      {
        while (p < end)
          *p++ >>= 8;
      }
    }
    else
    {
      // OpenGL gives ABGR (i.e. RGBA backwards); Qt wants ARGB
      res = res.swapRGB();
    }
    res.setAlphaBuffer(withAlpha && format().alpha());
  }
  else
  {
#if defined (Q_WS_WIN)
    res = QImage(w, h, 8);
    glReadPixels(0, 0, w, h, GL_COLOR_INDEX, GL_UNSIGNED_BYTE, res.bits());
    //int palSize = 0;
    //const QRgb* pal = QColor::palette(&palSize);
    //if (pal && palSize)
    //{
    //  res.setNumColors(palSize);
    //  for (int i = 0; i < palSize; i++)
    //  res.setColor(i, pal[i]);
    //}
#endif
  }

  return res.mirror();
}

#endif // QT_VERSION < 0x030000