TileImageSource.h

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/****************************************************************************
 *
 * (c) 2009-2024 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
 *
 * QGroundControl is licensed according to the terms in the file
 * COPYING.md in the root of the source code directory.
 *
 ****************************************************************************/
 
#pragma once
 
#include <QtCore/QElapsedTimer>
#include <QtCore/QHash>
#include <QtCore/QObject>
#include <QtCore/QSet>
#include <QtCore/QString>
#include <QtGui/QImage>
 
#include "TileMath.h"
 
class QNetworkAccessManager;
class QNetworkReply;
 
class TileImageSource : public QObject
{
    Q_OBJECT
 
public:
    explicit TileImageSource(const QString& mapType, QObject* parent = nullptr,
                             QNetworkAccessManager* networkManager = nullptr);
 
    QString mapType() const { return _mapType; }
 
    int requestTileImage(const TileMath::TileKey& key);
 
    void cancelRequest(int requestId);
 
    int pendingCount() const { return _pending.count(); }
 
signals:
    void tileImageReady(int requestId, const QImage& image);
    void tileImageFailed(int requestId);
 
private:
    void _fetchFromNetwork(int requestId, const TileMath::TileKey& key);
    void _failAsync(int requestId);
    void _deliver(int requestId, const TileMath::TileKey& key, const QByteArray& data);
    void _finishSucceeded(int requestId, const QImage& image);
    void _finishFailed(int requestId);
    void _warnFailure(const TileMath::TileKey& key, const QString& reason);
 
    static constexpr int kFailureWarnIntervalMs = 10000;  
 
    const QString _mapType;
    const int _mapId;
    QNetworkAccessManager* _networkManager = nullptr;
    int _requestIdCounter = 0;
    QSet<int> _pending;                         
    QHash<int, QNetworkReply*> _activeReplies;  
    QElapsedTimer _failureWarnTimer;            
};