/**
* Loads the thumbnail from the metadata.
* If no thumbnail is embedded, the whole image
* is loaded and downsampled in a fast manner.
* @param file the file to be loaded
* @return QImage the loaded image. Null if no image
* could be loaded at all.
**/
QImage DkThumbNail::computeIntern(const QFileInfo file, const QSharedPointer<QByteArray> ba,
int forceLoad, int maxThumbSize, int minThumbSize,
bool rescale) {
DkTimer dt;
//qDebug() << "[thumb] file: " << file.absoluteFilePath();
// see if we can read the thumbnail from the exif data
QImage thumb;
DkMetaDataT metaData;
try {
if (!ba || ba->isEmpty())
metaData.readMetaData(file);
else
metaData.readMetaData(file, ba);
// read the full image if we want to create new thumbnails
if (forceLoad != force_save_thumb)
thumb = metaData.getThumbnail();
}
catch(...) {
// do nothing - we'll load the full file
}
removeBlackBorder(thumb);
if (thumb.isNull() && forceLoad == force_exif_thumb)
return QImage();
bool exifThumb = !thumb.isNull();
int orientation = metaData.getOrientation();
int imgW = thumb.width();
int imgH = thumb.height();
int tS = minThumbSize;
// as found at: http://olliwang.com/2010/01/30/creating-thumbnail-images-in-qt/
QString filePath = (file.isSymLink()) ? file.symLinkTarget() : file.absoluteFilePath();
QImageReader* imageReader;
if (!ba || ba->isEmpty())
imageReader = new QImageReader(filePath);
else {
QBuffer buffer;
buffer.setData(ba->data());
buffer.open(QIODevice::ReadOnly);
imageReader = new QImageReader(&buffer, QFileInfo(filePath).suffix().toStdString().c_str());
buffer.close();
}
if (thumb.isNull() || thumb.width() < tS && thumb.height() < tS) {
imgW = imageReader->size().width();
imgH = imageReader->size().height(); // locks the file!
}
//else if (!thumb.isNull())
// qDebug() << "EXIV thumb loaded: " << thumb.width() << " x " << thumb.height();
if (rescale && (imgW > maxThumbSize || imgH > maxThumbSize)) {
if (imgW > imgH) {
imgH = (float)maxThumbSize / imgW * imgH;
imgW = maxThumbSize;
}
else if (imgW < imgH) {
imgW = (float)maxThumbSize / imgH * imgW;
imgH = maxThumbSize;
}
else {
imgW = maxThumbSize;
imgH = maxThumbSize;
}
}
if (thumb.isNull() || thumb.width() < tS && thumb.height() < tS || forceLoad == force_full_thumb || forceLoad == force_save_thumb) {
// flip size if the image is rotated by 90°
if (metaData.isTiff() && abs(orientation) == 90) {
int tmpW = imgW;
imgW = imgH;
imgH = tmpW;
qDebug() << "EXIV size is flipped...";
}
QSize initialSize = imageReader->size();
imageReader->setScaledSize(QSize(imgW, imgH));
thumb = imageReader->read();
// try to read the image
if (thumb.isNull()) {
DkBasicLoader loader;
if (loader.loadGeneral(file, ba, true, true))
thumb = loader.image();
}
// the image is not scaled correctly yet
if (rescale && !thumb.isNull() && (imgW == -1 || imgH == -1)) {
imgW = thumb.width();
imgH = thumb.height();
if (imgW > maxThumbSize || imgH > maxThumbSize) {
if (imgW > imgH) {
imgH = (float)maxThumbSize / imgW * imgH;
imgW = maxThumbSize;
}
else if (imgW < imgH) {
imgW = (float)maxThumbSize / imgH * imgW;
imgH = maxThumbSize;
}
else {
imgW = maxThumbSize;
imgH = maxThumbSize;
}
}
thumb = thumb.scaled(QSize(imgW*2, imgH*2), Qt::KeepAspectRatio, Qt::FastTransformation);
thumb = thumb.scaled(QSize(imgW, imgH), Qt::KeepAspectRatio, Qt::SmoothTransformation);
}
// is there a nice solution to do so??
imageReader->setFileName("josef"); // image reader locks the file -> but there should not be one so we just set it to another file...
delete imageReader;
}
else if (rescale) {
thumb = thumb.scaled(QSize(imgW, imgH), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
//qDebug() << "thumb loaded from exif...";
}
if (orientation != -1 && orientation != 0 && (metaData.isJpg() || metaData.isRaw())) {
QTransform rotationMatrix;
rotationMatrix.rotate((double)orientation);
thumb = thumb.transformed(rotationMatrix);
}
// save the thumbnail if the caller either forces it, or the save thumb is requested and the image did not have any before
if (forceLoad == force_save_thumb || (forceLoad == save_thumb && !exifThumb)) {
try {
QImage sThumb = thumb.copy();
if (orientation != -1 && orientation != 0) {
QTransform rotationMatrix;
rotationMatrix.rotate(-(double)orientation);
sThumb = sThumb.transformed(rotationMatrix);
}
metaData.setThumbnail(sThumb);
if (!ba || ba->isEmpty())
metaData.saveMetaData(file);
else
metaData.saveMetaData(file, ba);
qDebug() << "[thumb] saved to exif data";
}
catch(...) {
qDebug() << "Sorry, I could not save the metadata";
}
}
if (!thumb.isNull())
qDebug() << "[thumb] " << file.fileName() << " loaded in: " << dt.getTotal() << ((exifThumb) ? " from EXIV" : " from File");
//if (!thumb.isNull())
// qDebug() << "thumb: " << thumb.width() << " x " << thumb.height();
return thumb;
}
/**
* Loads the thumbnail from the metadata.
* If no thumbnail is embedded, the whole image
* is loaded and downsampled in a fast manner.
* @param file the file to be loaded
* @param ba the file buffer (can be empty)
* @param forceLoad the loading flag (e.g. exiv only)
* @param maxThumbSize the maximal thumbnail size to be loaded
* @param minThumbSize the minimal thumbnail size to be loaded
* @return QImage the loaded image. Null if no image
* could be loaded at all.
**/
QImage DkThumbNail::computeIntern(const QString& filePath, const QSharedPointer<QByteArray> ba,
int forceLoad, int maxThumbSize, int minThumbSize) {
DkTimer dt;
//qDebug() << "[thumb] file: " << file.absoluteFilePath();
// see if we can read the thumbnail from the exif data
QImage thumb;
DkMetaDataT metaData;
QSharedPointer<QByteArray> baZip = QSharedPointer<QByteArray>();
#ifdef WITH_QUAZIP
if (QFileInfo(mFile).dir().path().contains(DkZipContainer::zipMarker()))
baZip = DkZipContainer::extractImage(DkZipContainer::decodeZipFile(filePath), DkZipContainer::decodeImageFile(filePath));
#endif
try {
if (baZip && !baZip->isEmpty())
metaData.readMetaData(filePath, baZip);
else if (!ba || ba->isEmpty())
metaData.readMetaData(filePath);
else
metaData.readMetaData(filePath, ba);
// read the full image if we want to create new thumbnails
if (forceLoad != force_save_thumb)
thumb = metaData.getThumbnail();
}
catch(...) {
// do nothing - we'll load the full file
}
removeBlackBorder(thumb);
if (thumb.isNull() && forceLoad == force_exif_thumb)
return QImage();
bool exifThumb = !thumb.isNull();
int orientation = metaData.getOrientation();
int imgW = thumb.width();
int imgH = thumb.height();
int tS = minThumbSize;
// as found at: http://olliwang.com/2010/01/30/creating-thumbnail-images-in-qt/
QFileInfo fInfo(filePath);
QString lFilePath = fInfo.isSymLink() ? fInfo.symLinkTarget() : filePath;
fInfo = lFilePath;
QImageReader* imageReader = 0;
if (!ba || ba->isEmpty())
imageReader = new QImageReader(lFilePath);
else {
QBuffer buffer;
buffer.setData(ba->data());
buffer.open(QIODevice::ReadOnly);
imageReader = new QImageReader(&buffer, fInfo.suffix().toStdString().c_str());
buffer.close();
}
if (thumb.isNull() || (thumb.width() < tS && thumb.height() < tS)) {
imgW = imageReader->size().width(); // crash detected: unhandled exception at 0x66850E9A (msvcr110d.dll) in nomacs.exe: 0xC0000005: Access violation reading location 0x0000C788.
imgH = imageReader->size().height(); // locks the file!
}
if (forceLoad != DkThumbNailT::force_exif_thumb && (imgW > maxThumbSize || imgH > maxThumbSize)) {
if (imgW > imgH) {
imgH = qRound((float)maxThumbSize / imgW * imgH);
imgW = maxThumbSize;
}
else if (imgW < imgH) {
imgW = qRound((float)maxThumbSize / imgH * imgW);
imgH = maxThumbSize;
}
else {
imgW = maxThumbSize;
imgH = maxThumbSize;
}
}
bool rescale = forceLoad == force_save_thumb;
if (forceLoad != force_exif_thumb && (thumb.isNull() || thumb.width() < tS && thumb.height() < tS || forceLoad == force_full_thumb || forceLoad == force_save_thumb)) { // braces
// flip size if the image is rotated by 90°
if (metaData.isTiff() && abs(orientation) == 90) {
int tmpW = imgW;
imgW = imgH;
imgH = tmpW;
qDebug() << "EXIF size is flipped...";
}
QSize initialSize = imageReader->size();
imageReader->setScaledSize(QSize(imgW, imgH));
thumb = imageReader->read();
// try to read the image
if (thumb.isNull()) {
DkBasicLoader loader;
if (baZip && !baZip->isEmpty()) {
if (loader.loadGeneral(lFilePath, baZip, true, true))
thumb = loader.image();
}
else {
if (loader.loadGeneral(lFilePath, ba, true, true))
thumb = loader.image();
}
}
// the image is not scaled correctly yet
if (rescale && !thumb.isNull() && (imgW == -1 || imgH == -1)) {
imgW = thumb.width();
imgH = thumb.height();
if (imgW > maxThumbSize || imgH > maxThumbSize) {
if (imgW > imgH) {
imgH = qRound((float)maxThumbSize / imgW * imgH);
imgW = maxThumbSize;
}
else if (imgW < imgH) {
imgW = qRound((float)maxThumbSize / imgH * imgW);
imgH = maxThumbSize;
}
else {
imgW = maxThumbSize;
imgH = maxThumbSize;
}
}
thumb = thumb.scaled(QSize(imgW*2, imgH*2), Qt::KeepAspectRatio, Qt::FastTransformation);
thumb = thumb.scaled(QSize(imgW, imgH), Qt::KeepAspectRatio, Qt::SmoothTransformation);
}
// is there a nice solution to do so??
imageReader->setFileName("josef"); // image reader locks the file -> but there should not be one so we just set it to another file...
}
else if (rescale) {
thumb = thumb.scaled(QSize(imgW, imgH), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
}
if (imageReader)
delete imageReader;
if (orientation != -1 && orientation != 0 && (metaData.isJpg() || metaData.isRaw())) {
QTransform rotationMatrix;
rotationMatrix.rotate((double)orientation);
thumb = thumb.transformed(rotationMatrix);
}
// save the thumbnail if the caller either forces it, or the save thumb is requested and the image did not have any before
if (rescale || (forceLoad == save_thumb && !exifThumb)) {
try {
QImage sThumb = thumb.copy();
if (orientation != -1 && orientation != 0) {
QTransform rotationMatrix;
rotationMatrix.rotate(-(double)orientation);
sThumb = sThumb.transformed(rotationMatrix);
}
metaData.setThumbnail(sThumb);
if (!ba || ba->isEmpty())
metaData.saveMetaData(lFilePath);
else
metaData.saveMetaData(lFilePath, ba);
qDebug() << "[thumb] saved to exif data";
}
catch(...) {
qDebug() << "Sorry, I could not save the metadata";
}
}
if (!thumb.isNull())
qDebug() << "[thumb] " << fInfo.fileName() << "(" << thumb.width() << " x " << thumb.height() << ") loaded in: " << dt.getTotal() << ((exifThumb) ? " from EXIV" : " from File");
return thumb;
}
