UI to learn hashes of local image files

This addes a menu entry for the user to select a directory that is recursively
traversed to look for image files and compute the hashes of those images (for
those images to be available to be displayed in dives according to their hash values).

This traversal and hash computation happens in and independend thread and so far
the only feedback to the user is that upon completion the dispayed images are updated.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/qthelper.cpp b/qthelper.cpp
index 74c67d769..14e67e089 100644
--- a/qthelper.cpp
+++ b/qthelper.cpp
@@ -849,3 +849,27 @@ void updateHash(struct picture *picture) {
 	picture->hash = strdup(hash.toHex());
 	free(old);
 }
+
+void learnImages(const QDir dir, int max_recursions, bool recursed)
+{
+	QDir current(dir);
+	QStringList filters, files;
+
+	if (max_recursions) {
+		foreach (QString dirname, dir.entryList(QStringList(), QDir::NoDotAndDotDot | QDir::Dirs)) {
+			learnImages(QDir(dir.filePath(dirname)), max_recursions - 1, true);
+		}
+	}
+
+	foreach (QString format, QImageReader::supportedImageFormats()) {
+		filters.append(QString("*.").append(format));
+	}
+
+	foreach (QString file, dir.entryList(filters, QDir::Files)) {
+		files.append(dir.absoluteFilePath(file));
+	}
+
+	QtConcurrent::blockingMap(files, hashFile);
+	if (!recursed)
+		DivePictureModel::instance()->updateDivePictures();
+}