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 <QtConcurrent/QtConcurrentRun>
#include <QFutureWatcher>
#include <QElapsedTimer>

#include "qgsrectangle.h"
#include "qgsterraintileloader_p.h"
#include "qgstilingscheme.h"

class QgsRasterDataProvider;
class QgsRasterLayer;

class QgsDemTerrainTileLoader : public QgsTerrainTileLoader
{
    Q_OBJECT
  public:
    QgsDemTerrainTileLoader( QgsTerrainEntity *terrain, QgsChunkNode *node );

    Qt3DCore::QEntity *createEntity( Qt3DCore::QEntity *parent ) override;

  private slots:
    void onHeightMapReady( int jobId, const QByteArray &heightMap );

  private:

    int mHeightMapJobId;
    QByteArray mHeightMap;
    int mResolution;
    float mSkirtHeight;
};



class QgsDemHeightMapGenerator : public QObject
{
    Q_OBJECT
  public:

    QgsDemHeightMapGenerator( QgsRasterLayer *dtm, const QgsTilingScheme &tilingScheme, int resolution );
    ~QgsDemHeightMapGenerator() override;

    int render( int x, int y, int z );

    QByteArray renderSynchronously( int x, int y, int z );

    int resolution() const { return mResolution; }

    float heightAt( double x, double y );

  signals:
    void heightMapReady( int jobId, const QByteArray &heightMap );

  private slots:
    void onFutureFinished();

  private:
    QgsRasterLayer *mDtm = nullptr;

    QgsRasterDataProvider *mClonedProvider = nullptr;

    QgsTilingScheme mTilingScheme;

    int mResolution;

    int mLastJobId;

    struct JobData
    {
      int jobId;
      QgsRectangle extent;
      QFuture<QByteArray> future;
      QFutureWatcher<QByteArray> *fw;
      QElapsedTimer timer;
    };

    QHash<QFutureWatcher<QByteArray>*, JobData> mJobs;

    QByteArray mDtmCoarseData;
};


#endif // QGSDEMTERRAINTILELOADER_P_H