qgsdemterraintileloader_p.h

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/***************************************************************************
  qgsdemterraintileloader_p.h
  --------------------------------------
  Date                 : July 2017
  Copyright            : (C) 2017 by Martin Dobias
  Email                : wonder dot sk at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program 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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSDEMTERRAINTILELOADER_P_H
#define QGSDEMTERRAINTILELOADER_P_H

 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the QGIS API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
 
 
#include "qgschunkloader.h"
#include "qgschunknode.h"
#include "qgscoordinatetransformcontext.h"
#include "qgsrectangle.h"
#include "qgstilingscheme.h"
 
#include <QElapsedTimer>
#include <QFutureWatcher>
#include <QMutex>
 
#define SIP_NO_FILE
 
class QgsRasterDataProvider;
class QgsRasterLayer;
class QgsRasterBlock;
class QgsCoordinateTransformContext;
class QgsTerrainGenerator;
class QgsTerrainDownloader;

class QgsDemHeightMapGenerator : public QObject
{
    Q_OBJECT
  public:
    QgsDemHeightMapGenerator( QgsRasterLayer *dtm, const QgsTilingScheme &tilingScheme, int resolution, const QgsCoordinateTransformContext &transformContext );
    ~QgsDemHeightMapGenerator() override;

    QFuture<QByteArray> render( const QgsChunkNodeId &nodeId );

    void waitForFinished();

    int resolution() const { return mResolution; }

    float heightAt( double x, double y );
 
  private:
    const QgsRectangle mDtmExtent;

    std::unique_ptr<QgsRasterDataProvider> mClonedProvider;
 
    QgsTilingScheme mTilingScheme;
 
    int mResolution;
 
    std::unique_ptr<QgsTerrainDownloader> mDownloader;
 
    QHash<QFutureWatcher<QByteArray> *, QFuture<QByteArray>> mJobs;
 
    void lazyLoadDtmCoarseData( int res, const QgsRectangle &rect );
    mutable QMutex mLazyLoadDtmCoarseDataMutex;
    std::unique_ptr<QgsRasterBlock> mDtmCoarseRasterBlock;
 
    QgsCoordinateTransformContext mTransformContext;
};

 
#endif // QGSDEMTERRAINTILELOADER_P_H