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media: load metadata and thumbnails of raw pictures using libraw

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The distinguished photographer shoots raw images. There is a
comprehensive library that can extract metadata and thumbnails
from these images. Let's use it if available.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2023-09-04 07:22:31 +02:00 • committed by Michael Keller
parent 02638d7c3e
commit 13d1188c41
6 changed files with 98 additions and 10 deletions
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41
core/imagedownloader.cpp
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@ -14,6 +14,9 @@
#include <QSvgRenderer>
#include <QDataStream>
#include <QPainter>
#ifdef LIBRAW_SUPPORT
#include <libraw/libraw.h>
#endif
#include <QtConcurrent>
@ -79,12 +82,40 @@ static bool hasVideoFileExtension(const QString &filename)
return false;
}
// Fetch a picture from the given filename and determine its type (picture of video).
#ifdef LIBRAW_SUPPORT
QImage fetchRawThumbnail(const QString &filename)
{
LibRaw raw; // Might think about reusing that, one instance per thread
// TODO: Convert filename to UTF-16 for windows
if (raw.open_file(qPrintable(filename)) != LIBRAW_SUCCESS ||
raw.unpack_thumb() != LIBRAW_SUCCESS) {
return QImage();
}
switch (raw.imgdata.thumbnail.tformat) {
case LIBRAW_THUMBNAIL_JPEG: {
QImage res;
res.loadFromData(reinterpret_cast<unsigned char *>(raw.imgdata.thumbnail.thumb),
raw.imgdata.thumbnail.tlength);
return res;
}
case LIBRAW_THUMBNAIL_BITMAP:
return QImage(reinterpret_cast<unsigned char *>(raw.imgdata.thumbnail.thumb),
raw.imgdata.thumbnail.twidth, raw.imgdata.thumbnail.theight,
QImage::Format_RGB888);
default: // Unsupported
return QImage();
}
}
#endif
// Fetch a picture from the given filename and determine its type (picture or video).
// If this is a non-remote file, fetch it from disk. Remote files are fetched from the
// net in a background thread. In such a case, the output-type is set to MEDIATYPE_STILL_LOADING.
// If the input-flag "tryDownload" is set to false, no download attempt is made. This is to
// prevent infinite loops, where failed image downloads would be repeated ad infinitum.
// Returns: fetched image, type
Thumbnailer::Thumbnail Thumbnailer::fetchImage(const QString &urlfilename, const QString &originalFilename, bool tryDownload)
{
QUrl url = QUrl::fromUserInput(urlfilename);
@ -102,6 +133,12 @@ Thumbnailer::Thumbnail Thumbnailer::fetchImage(const QString &urlfilename, const
// Try if Qt can parse this image. If it does, use this as a thumbnail.
QImage thumb(filename);
#ifdef LIBRAW_SUPPORT
// If note, perhaps a raw image?
if (thumb.isNull())
thumb = fetchRawThumbnail(filename);
#endif
if (!thumb.isNull()) {
int size = maxThumbnailSize();
thumb = thumb.scaled(size, size, Qt::KeepAspectRatio);