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Dive pictures: Scale thumbnails on demand

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To potentially conserve memory, don't keep copies of scaled thumbnails.
Scale the thumbnails on demand.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2018-04-11 06:56:46 +02:00 committed by Dirk Hohndel
parent 6b4e830670
commit c0bca3ad04
2 changed files with 19 additions and 14 deletions
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29
qt-models/divepicturemodel.cpp
View file

@ -17,7 +17,7 @@ static QImage getThumbnailFromCache(const PictureEntry &entry)
return thumbnailCache.value(entry.filename);
}
static void scaleImages(PictureEntry &entry, int size, int maxSize)
static void scaleImages(PictureEntry &entry, int maxSize)
{
QImage thumbnail = getThumbnailFromCache(entry);
// If thumbnails were written by an earlier version, they might be smaller than needed.
@ -29,9 +29,7 @@ static void scaleImages(PictureEntry &entry, int size, int maxSize)
thumbnailCache.insert(entry.filename, thumbnail);
}
entry.imageProfile = thumbnail.scaled(maxSize / maxZoom, maxSize / maxZoom, Qt::KeepAspectRatio);
entry.image = size == maxSize ? thumbnail
: thumbnail.scaled(size, size, Qt::KeepAspectRatio);
entry.image = thumbnail;
}
DivePictureModel *DivePictureModel::instance()
@ -42,7 +40,8 @@ DivePictureModel *DivePictureModel::instance()
DivePictureModel::DivePictureModel() : rowDDStart(0),
rowDDEnd(0),
zoomLevel(0.0)
zoomLevel(0.0),
defaultSize(defaultIconMetrics().sz_pic)
{
}
@ -62,11 +61,11 @@ void DivePictureModel::setZoomLevel(int level)
zoomLevel = -1.0;
if (zoomLevel > 1.0)
zoomLevel = 1.0;
updateThumbnails();
updateZoom();
layoutChanged();
}
void DivePictureModel::updateThumbnails()
void DivePictureModel::updateZoom()
{
// Calculate size of thumbnails. The standard size is defaultIconMetrics().sz_pic.
// We use exponential scaling so that the central point is the standard
@ -75,10 +74,14 @@ void DivePictureModel::updateThumbnails()
// Naturally, these three zoom levels are then represented by
// -1.0 (minimum), 0 (standard) and 1.0 (maximum). The actual size is
// calculated as standard_size*3.0^zoomLevel.
int defaultSize = defaultIconMetrics().sz_pic;
size = static_cast<int>(round(defaultSize * pow(maxZoom, zoomLevel)));
}
void DivePictureModel::updateThumbnails()
{
int maxSize = defaultSize * maxZoom;
int size = static_cast<int>(round(defaultSize * pow(maxZoom, zoomLevel)));
QtConcurrent::blockingMap(pictures, [size, maxSize](PictureEntry &entry){scaleImages(entry, size, maxSize);});
updateZoom();
QtConcurrent::blockingMap(pictures, [maxSize](PictureEntry &entry){scaleImages(entry, maxSize);});
}
void DivePictureModel::updateDivePictures()
@ -101,7 +104,7 @@ void DivePictureModel::updateDivePictures()
if (dive->id == displayed_dive.id)
rowDDStart = pictures.count();
FOR_EACH_PICTURE(dive)
pictures.push_back({picture, picture->filename, {}, {}, picture->offset.seconds});
pictures.push_back({picture, picture->filename, {}, picture->offset.seconds});
if (dive->id == displayed_dive.id)
rowDDEnd = pictures.count();
}
@ -134,10 +137,10 @@ QVariant DivePictureModel::data(const QModelIndex &index, int role) const
ret = entry.filename;
break;
case Qt::DecorationRole:
ret = entry.image;
ret = entry.image.scaled(size, size, Qt::KeepAspectRatio);
break;
case Qt::UserRole: // Used by profile widget to access bigger thumbnails
ret = entry.imageProfile;
ret = entry.image.scaled(defaultSize, defaultSize, Qt::KeepAspectRatio);
break;
case Qt::DisplayRole:
ret = QFileInfo(entry.filename).fileName();

4
qt-models/divepicturemodel.h
View file

@ -10,7 +10,6 @@ struct PictureEntry {
struct picture *picture;
QString filename;
QImage image;
QImage imageProfile; // For the profile widget keep a copy of a constant sized image
int offsetSeconds;
};
@ -31,7 +30,10 @@ private:
DivePictureModel();
QList<PictureEntry> pictures;
double zoomLevel; // -1.0: minimum, 0.0: standard, 1.0: maximum
int defaultSize;
int size;
void updateThumbnails();
void updateZoom();
};
#endif