qgsrasterrendererregistry.h

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/***************************************************************************
                         qgsrasterrendererregistry.h
                         ---------------------------
    begin                : January 2012
    copyright            : (C) 2012 by Marco Hugentobler
    email                : marco at sourcepole dot ch
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   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 QGSRASTERRENDERERREGISTRY_H
#define QGSRASTERRENDERERREGISTRY_H
 
 
#define SIP_NO_FILE
 
 
 
#include "qgis_core.h"
#include "qgsrasterlayer.h" //for DrawingStyle enum
#include <QHash>
#include <QString>
 
class QDomElement;
class QgsRasterInterface;
class QgsRasterLayer;
class QgsRasterRenderer;
class QgsRasterRendererWidget;
 
typedef QgsRasterRenderer *( *QgsRasterRendererCreateFunc )( const QDomElement &, QgsRasterInterface *input );
typedef QgsRasterRendererWidget *( *QgsRasterRendererWidgetCreateFunc )( QgsRasterLayer *, const QgsRectangle &extent );
 
struct CORE_EXPORT QgsRasterRendererRegistryEntry
{
  QgsRasterRendererRegistryEntry( const QString &name, const QString &visibleName, QgsRasterRendererCreateFunc rendererFunction,
                                  QgsRasterRendererWidgetCreateFunc widgetFunction );
 
  QgsRasterRendererRegistryEntry() = default;
  QString name;
  QString visibleName; //visible (and translatable) name
  QIcon icon();
  QgsRasterRendererCreateFunc rendererCreateFunction = nullptr ; //pointer to create function
  QgsRasterRendererWidgetCreateFunc widgetCreateFunction = nullptr ; //pointer to create function for renderer widget
};
 
class CORE_EXPORT QgsRasterRendererRegistry
{
  public:
 
    QgsRasterRendererRegistry();
 
    void insert( const QgsRasterRendererRegistryEntry &entry );
    void insertWidgetFunction( const QString &rendererName, QgsRasterRendererWidgetCreateFunc func );
    bool rendererData( const QString &rendererName, QgsRasterRendererRegistryEntry &data ) const;
    QStringList renderersList() const;
    QList< QgsRasterRendererRegistryEntry > entries() const;
 
    QgsRasterRenderer *defaultRendererForDrawingStyle( QgsRaster::DrawingStyle drawingStyle, QgsRasterDataProvider *provider ) const;
 
  private:
    QHash< QString, QgsRasterRendererRegistryEntry > mEntries;
    QStringList mSortedEntries;
 
    //read min/max values from
    bool minMaxValuesForBand( int band, QgsRasterDataProvider *provider, double &minValue, double &maxValue ) const;
};
 
#endif // QGSRASTERRENDERERREGISTRY_H