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imagecache.h
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imagecache.h
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/*
Copyright 2023 Sergey Levin <serjth@levz.dev>
This file is part of Image Finder.
Image Finder is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Image Finder is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Image Finder. If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
*/
#pragma once
#include <QHash>
#include <QImage>
#include <QObject>
#include <QSet>
/**
* @brief The ImageCache class is the singleton used for caching images to fast access
*/
class ImageCache : public QObject
{
Q_OBJECT
Q_DISABLE_COPY(ImageCache)
public:
static ImageCache& instance();
QImage get(const QString &path, const QSize &size) const;
void reset();
public slots:
void add(const QString &path, const QSize &size, const QImage &image);
signals:
void updated(const QSize &, const QString &);
void reseted();
private:
ImageCache();
using Previews = QHash<QSize, QImage>;
QHash<QString, Previews> mImages;
};
/**
* @brief The ImageCacheCount class implements cached previews counter
*/
class ImageCacheCount : public QObject
{
Q_OBJECT
Q_PROPERTY(QSize imageSize WRITE setImageSize)
Q_PROPERTY(uint count READ count NOTIFY countChanged)
public:
ImageCacheCount(int previewSize, QObject *parent = nullptr);
uint count() const;
public slots:
void reset();
void setImageSize(const QSize &value);
signals:
void countChanged();
private:
QSize mSize;
QHash<QSize, QSet<uint>> mCount;
};