PreviewPropertiesList PreviewManager::getPreviewProperties() const
{
PreviewPropertiesList list;
// go through the loader table and store all successfully created loaders in the list
for (PreviewId id = 0; id < Loader::getNumLoaders(); ++id) {
Loader::AutoPtr loader = Loader::create(id, image_);
if (loader.get() && loader->readDimensions()) {
list.push_back(loader->getProperties());
}
}
std::sort(list.begin(), list.end(), cmpPreviewProperties);
return list;
}
void Rw2Image::readMetadata()
{
#ifdef DEBUG
std::cerr << "Reading RW2 file " << io_->path() << "\n";
#endif
if (io_->open() != 0) {
throw Error(9, io_->path(), strError());
}
IoCloser closer(*io_);
// Ensure that this is the correct image type
if (!isRw2Type(*io_, false)) {
if (io_->error() || io_->eof()) throw Error(14);
throw Error(3, "RW2");
}
clearMetadata();
std::ofstream devnull;
printStructure(devnull, kpsRecursive, 0);
ByteOrder bo = Rw2Parser::decode(exifData_,
iptcData_,
xmpData_,
io_->mmap(),
io_->size());
setByteOrder(bo);
// A lot more metadata is hidden in the embedded preview image
// Todo: This should go into the Rw2Parser, but for that it needs the Image
PreviewManager loader(*this);
PreviewPropertiesList list = loader.getPreviewProperties();
// Todo: What if there are more preview images?
if (list.size() > 1) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "RW2 image contains more than one preview. None used.\n";
#endif
}
if (list.size() != 1) return;
ExifData exifData;
PreviewImage preview = loader.getPreviewImage(*list.begin());
Image::AutoPtr image = ImageFactory::open(preview.pData(), preview.size());
if (image.get() == 0) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Failed to open RW2 preview image.\n";
#endif
return;
}
image->readMetadata();
ExifData& prevData = image->exifData();
if (!prevData.empty()) {
// Filter duplicate tags
for (ExifData::const_iterator pos = exifData_.begin(); pos != exifData_.end(); ++pos) {
if (pos->ifdId() == panaRawId) continue;
ExifData::iterator dup = prevData.findKey(ExifKey(pos->key()));
if (dup != prevData.end()) {
#ifdef DEBUG
std::cerr << "Filtering duplicate tag " << pos->key()
<< " (values '" << pos->value()
<< "' and '" << dup->value() << "')\n";
#endif
prevData.erase(dup);
}
}
}
// Remove tags not applicable for raw images
static const char* filteredTags[] = {
"Exif.Photo.ComponentsConfiguration",
"Exif.Photo.CompressedBitsPerPixel",
"Exif.Panasonic.ColorEffect",
"Exif.Panasonic.Contrast",
"Exif.Panasonic.NoiseReduction",
"Exif.Panasonic.ColorMode",
"Exif.Panasonic.OpticalZoomMode",
"Exif.Panasonic.Contrast",
"Exif.Panasonic.Saturation",
"Exif.Panasonic.Sharpness",
"Exif.Panasonic.FilmMode",
"Exif.Panasonic.SceneMode",
"Exif.Panasonic.WBRedLevel",
"Exif.Panasonic.WBGreenLevel",
"Exif.Panasonic.WBBlueLevel",
"Exif.Photo.ColorSpace",
"Exif.Photo.PixelXDimension",
"Exif.Photo.PixelYDimension",
"Exif.Photo.SceneType",
"Exif.Photo.CustomRendered",
"Exif.Photo.DigitalZoomRatio",
"Exif.Photo.SceneCaptureType",
"Exif.Photo.GainControl",
"Exif.Photo.Contrast",
"Exif.Photo.Saturation",
"Exif.Photo.Sharpness",
"Exif.Image.PrintImageMatching",
"Exif.Image.YCbCrPositioning"
};
for (unsigned int i = 0; i < EXV_COUNTOF(filteredTags); ++i) {
ExifData::iterator pos = prevData.findKey(ExifKey(filteredTags[i]));
if (pos != prevData.end()) {
#ifdef DEBUG
std::cerr << "Exif tag " << pos->key() << " removed\n";
#endif
prevData.erase(pos);
}
}
// Add the remaining tags
for (ExifData::const_iterator pos = prevData.begin(); pos != prevData.end(); ++pos) {
exifData_.add(*pos);
}
} // Rw2Image::readMetadata
QImage Exiv2Lib::getPreview()
{
PreviewManager loader(*mImageFile);
PreviewPropertiesList list = loader.getPreviewProperties();
if (list.empty())
{
qDebug() << "Image contains no thumbnail";
return QImage();
}
PreviewProperties selected;
// Take the last image in the list.
// For Canon raw pictures, the 2nd preview has no white balance applied.
// see http://lclevy.free.fr/cr2/
// section 2.6 IFD #2
selected = list.back();
// FIXME: crash hapened here when reading the QImage.
// not quite sure what caused it
// load the thumbnail
PreviewImage thumbnail = loader.getPreviewImage(selected);
const unsigned char* tmp = thumbnail.pData();
size_t size = thumbnail.size();
QImage thumb;
thumb.loadFromData(tmp, size);
// Read the EXIF orientation flag and rotate the image accordingly.
ExifData& data = mImageFile->exifData();
ExifData::const_iterator pos;
pos = data.findKey(ExifKey("Exif.Image.Orientation"));
// TODO: should flip/rotate after resize
if (pos != data.end())
{
qDebug() << "rotation" << pos->toLong();
QTransform rotate;
switch (pos->toLong())
{
case 1: // no rotation needed
break;
case 2: // flip over y
thumb = thumb.mirrored(true, false);
break;
case 3: // rotate 180 (or flip x flip y)
thumb = thumb.mirrored(true, true);
break;
case 4: // flip over x
thumb = thumb.mirrored(false, true);
break;
case 5: // rotate 90 CW & flip over y
rotate.rotate(90);
rotate.rotate(180, Qt::YAxis);
thumb = thumb.transformed(rotate);
break;
case 6: // rotate 90 CW
rotate.rotate(90);
thumb = thumb.transformed(rotate);
break;
case 7: // rotate 90 CCW flip over y
rotate.rotate(-90);
rotate.rotate(180, Qt::YAxis);
thumb = thumb.transformed(rotate);
break;
case 8: // rotate 90 CCW
rotate.rotate(-90);
thumb = thumb.transformed(rotate);
break;
}
}
return thumb;
}