qgsrasterlayerrenderer.h

Go to the documentation of this file.

/***************************************************************************
  qgsrasterlayerrenderer.h
  --------------------------------------
  Date                 : December 2013
  Copyright            : (C) 2013 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 QGSRASTERLAYERRENDERER_H
#define QGSRASTERLAYERRENDERER_H
 
 
#include "qgsmapclippingregion.h"
#include "qgsmaplayerrenderer.h"
 
#define SIP_NO_FILE
 
class QPainter;
 
class QgsMapToPixel;
class QgsRasterLayer;
class QgsRasterPipe;
struct QgsRasterViewPort;
class QgsRenderContext;
 
class QgsRasterLayerRenderer;
class QgsRasterLayerLabelProvider;
 
#include "qgsrasterinterface.h"


class CORE_EXPORT QgsRasterLayerRendererFeedback : public QgsRasterBlockFeedback
{
    Q_OBJECT
 
  public:
    explicit QgsRasterLayerRendererFeedback( QgsRasterLayerRenderer *r );

    void onNewData() override;
 
  private:
    QgsRasterLayerRenderer *mR = nullptr; 
    int mMinimalPreviewInterval = 250;    
    QTime mLastPreview;                   
};


class CORE_EXPORT QgsRasterLayerRenderer : public QgsMapLayerRenderer
{
  public:
    QgsRasterLayerRenderer( QgsRasterLayer *layer, QgsRenderContext &rendererContext );
    ~QgsRasterLayerRenderer() override;
 
    bool render() override;
    QgsFeedback *feedback() const override;
    bool forceRasterRender() const override;
 
  private:
    void prepareLabeling( QgsRasterLayer *layer );
    void drawLabeling();
 
    QString mLayerName;
    std::unique_ptr<QgsRasterViewPort> mRasterViewPort;
 
    double mLayerOpacity = 1.0;
    std::unique_ptr<QgsRasterPipe> mPipe;
 
    Qgis::RasterProviderCapabilities mProviderCapabilities;
    Qgis::RasterInterfaceCapabilities mInterfaceCapabilities;

    std::unique_ptr<QgsRasterLayerRendererFeedback> mFeedback;
 
    QList< QgsMapClippingRegion > mClippingRegions;
 
    double mElevationScale = 1.0;
    double mElevationOffset = 0.0;
    int mElevationBand = 0;
    bool mDrawElevationMap = false;
 
    bool mEnableProfile = false;
    quint64 mPreparationTime = 0;
 
    // may be NULLPTR. no need to delete: if exists it is owned by labeling engine
    QgsRasterLayerLabelProvider *mLabelProvider = nullptr;
 
    void drawElevationMap();
 
    friend class QgsRasterLayerRendererFeedback;
};
 
 
#endif // QGSRASTERLAYERRENDERER_H