qgsrasterlayer.h

Go to the documentation of this file.

/***************************************************************************
                        qgsrasterlayer.h  -  description
                              -------------------
 begin                : Fri Jun 28 2002
 copyright            : (C) 2004 by T.Sutton, Gary E.Sherman, Steve Halasz
 email                : [email protected]
***************************************************************************/
/*
 * Peter J. Ersts - contributed to the refactoring and maintenance of this class
 * B. Morley - added functions to convert this class to a data provider interface
 * Frank Warmerdam - contributed bug fixes and migrated class to use all GDAL_C_API calls
 */
/***************************************************************************
 *                                                                         *
 *   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 QGSRASTERLAYER_H
#define QGSRASTERLAYER_H
 
#include "qgis_core.h"
#include "qgis_sip.h"
#include <QColor>
#include <QDateTime>
#include <QList>
#include <QMap>
#include <QPair>
#include <QVector>
 
#include "qgis_sip.h"
#include "qgis.h"
#include "qgsmaplayer.h"
#include "qgsraster.h"
#include "qgsrasterdataprovider.h"
#include "qgsrasterviewport.h"
#include "qgsrasterminmaxorigin.h"
#include "qgscontrastenhancement.h"
 
class QgsMapToPixel;
class QgsRasterRenderer;
class QgsRectangle;
class QgsRasterLayerTemporalProperties;
class QgsRasterPipe;
class QgsRasterResampleFilter;
class QgsBrightnessContrastFilter;
class QgsHueSaturationFilter;
 
class QImage;
class QPixmap;
class QSlider;
 
typedef QList < QPair< QString, QColor > > QgsLegendColorList;
 
class CORE_EXPORT QgsRasterLayer : public QgsMapLayer
{
    Q_OBJECT
  public:
 
    static const double SAMPLE_SIZE;
 
    static const QgsContrastEnhancement::ContrastEnhancementAlgorithm SINGLE_BAND_ENHANCEMENT_ALGORITHM;
 
    static const QgsContrastEnhancement::ContrastEnhancementAlgorithm MULTIPLE_BAND_SINGLE_BYTE_ENHANCEMENT_ALGORITHM;
 
    static const QgsContrastEnhancement::ContrastEnhancementAlgorithm MULTIPLE_BAND_MULTI_BYTE_ENHANCEMENT_ALGORITHM;
 
    static const QgsRasterMinMaxOrigin::Limits SINGLE_BAND_MIN_MAX_LIMITS;
 
    static const QgsRasterMinMaxOrigin::Limits MULTIPLE_BAND_SINGLE_BYTE_MIN_MAX_LIMITS;
 
    static const QgsRasterMinMaxOrigin::Limits MULTIPLE_BAND_MULTI_BYTE_MIN_MAX_LIMITS;
 
    QgsRasterLayer();
 
    struct LayerOptions
    {
 
      explicit LayerOptions( bool loadDefaultStyle = true,
                             const QgsCoordinateTransformContext &transformContext = QgsCoordinateTransformContext() )
        : loadDefaultStyle( loadDefaultStyle )
        , transformContext( transformContext )
      {}
 
      bool loadDefaultStyle = true;
 
      QgsCoordinateTransformContext transformContext = QgsCoordinateTransformContext();
 
      bool skipCrsValidation = false;
 
    };
 
    explicit QgsRasterLayer( const QString &uri,
                             const QString &baseName = QString(),
                             const QString &providerType = "gdal",
                             const QgsRasterLayer::LayerOptions &options = QgsRasterLayer::LayerOptions() );
 
    ~QgsRasterLayer() override;
 
#ifdef SIP_RUN
    SIP_PYOBJECT __repr__();
    % MethodCode
    QString str = QStringLiteral( "<QgsRasterLayer: '%1' (%2)>" ).arg( sipCpp->name(), sipCpp->dataProvider() ? sipCpp->dataProvider()->name() : QStringLiteral( "Invalid" ) );
    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
    % End
#endif
 
    QgsRasterLayer *clone() const override SIP_FACTORY;
 
    enum ColorShadingAlgorithm
    {
      UndefinedShader,
      PseudoColorShader,
      FreakOutShader,
      ColorRampShader,
      UserDefinedShader
    };
 
    enum LayerType
    {
      GrayOrUndefined,
      Palette,
      Multiband,
      ColorLayer
    };
 
    static bool isValidRasterFileName( const QString &fileNameQString, QString &retError );
    // TODO QGIS 4.0 - rename fileNameQString to fileName
 
    static bool isValidRasterFileName( const QString &fileNameQString );
 
    static QDateTime lastModified( const QString   &name );
 
    Q_DECL_DEPRECATED void setDataProvider( const QString &provider ) SIP_DEPRECATED;
 
    void setDataProvider( const QString &provider, const QgsDataProvider::ProviderOptions &options, QgsDataProvider::ReadFlags flags = QgsDataProvider::ReadFlags() );
 
    LayerType rasterType() { return mRasterType; }
 
    void setRenderer( QgsRasterRenderer *renderer SIP_TRANSFER );
 
    QgsRasterRenderer *renderer() const;
 
    QgsRasterResampleFilter *resampleFilter() const;
 
    QgsBrightnessContrastFilter *brightnessFilter() const;
 
    QgsHueSaturationFilter *hueSaturationFilter() const;
 
    void setResamplingStage( Qgis::RasterResamplingStage stage );
 
    Qgis::RasterResamplingStage resamplingStage() const;
 
    QgsRasterPipe *pipe() { return mPipe.get(); }
 
    int width() const;
 
    int height() const;
 
    int bandCount() const;
 
    QString bandName( int bandNoInt ) const;
 
    QgsRasterDataProvider *dataProvider() override;
 
    const QgsRasterDataProvider *dataProvider() const SIP_PYNAME( constDataProvider ) override;
 
    void reload() override;
    QgsMapLayerRenderer *createMapRenderer( QgsRenderContext &rendererContext ) override SIP_FACTORY;
 
    void draw( QPainter *theQPainter,
               QgsRasterViewPort *myRasterViewPort,
               const QgsMapToPixel *qgsMapToPixel = nullptr );
 
    Q_DECL_DEPRECATED QgsLegendColorList legendSymbologyItems() const SIP_DEPRECATED;
 
    bool isSpatial() const override { return true; }
 
    QString htmlMetadata() const override;
 
    QPixmap paletteAsPixmap( int bandNumber = 1 );
 
    QString providerType() const;
 
    double rasterUnitsPerPixelX() const;
 
    double rasterUnitsPerPixelY() const;
 
    void setOpacity( double opacity ) FINAL;
    double opacity() const FINAL;
 
    void setContrastEnhancement( QgsContrastEnhancement::ContrastEnhancementAlgorithm algorithm,
                                 QgsRasterMinMaxOrigin::Limits limits = QgsRasterMinMaxOrigin::MinMax,
                                 const QgsRectangle &extent = QgsRectangle(),
                                 int sampleSize = QgsRasterLayer::SAMPLE_SIZE,
                                 bool generateLookupTableFlag = true );
 
    void refreshContrastEnhancement( const QgsRectangle &extent ) SIP_SKIP;
 
    void refreshRendererIfNeeded( QgsRasterRenderer *rasterRenderer, const QgsRectangle &extent ) SIP_SKIP;
 
    virtual QString subsetString() const;
 
    virtual bool setSubsetString( const QString &subset );
 
    bool defaultContrastEnhancementSettings(
      QgsContrastEnhancement::ContrastEnhancementAlgorithm &myAlgorithm,
      QgsRasterMinMaxOrigin::Limits &myLimits ) const SIP_SKIP;
 
    void setDefaultContrastEnhancement();
 
    QStringList subLayers() const override;
 
    QImage previewAsImage( QSize size, const QColor &bgColor = Qt::white,
                           QImage::Format format = QImage::Format_ARGB32_Premultiplied );
 
    void setLayerOrder( const QStringList &layers ) override;
    void setSubLayerVisibility( const QString &name, bool vis ) override;
    QDateTime timestamp() const override;
    bool accept( QgsStyleEntityVisitorInterface *visitor ) const override;
 
    bool writeSld( QDomNode &node, QDomDocument &doc, QString &errorMessage, const QVariantMap &props = QVariantMap() ) const;
 
    bool ignoreExtents() const;
 
    QgsMapLayerTemporalProperties *temporalProperties() override;
 
  public slots:
    void showStatusMessage( const QString &message );
 
    virtual void setTransformContext( const QgsCoordinateTransformContext &transformContext ) override;
 
  signals:
 
    void subsetStringChanged();
 
 
  protected:
    bool readSymbology( const QDomNode &node, QString &errorMessage, QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories = QgsMapLayer::AllStyleCategories ) override;
    bool readStyle( const QDomNode &node, QString &errorMessage, QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories = QgsMapLayer::AllStyleCategories ) override;
    bool readXml( const QDomNode &layer_node, QgsReadWriteContext &context ) override;
    bool writeSymbology( QDomNode &, QDomDocument &doc, QString &errorMessage,
                         const QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories = QgsMapLayer::AllStyleCategories ) const override;
    bool writeStyle( QDomNode &node, QDomDocument &doc, QString &errorMessage,
                     const QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories = QgsMapLayer::AllStyleCategories ) const override;
    bool writeXml( QDomNode &layer_node, QDomDocument &doc, const QgsReadWriteContext &context ) const override;
    QString encodedSource( const QString &source, const QgsReadWriteContext &context ) const override;
    QString decodedSource( const QString &source, const QString &provider,  const QgsReadWriteContext &context ) const override;
 
  private:
    void init();
 
    void closeDataProvider();
 
    bool update();
 
    void setRendererForDrawingStyle( QgsRaster::DrawingStyle drawingStyle );
 
    void setContrastEnhancement( QgsContrastEnhancement::ContrastEnhancementAlgorithm algorithm,
                                 QgsRasterMinMaxOrigin::Limits limits,
                                 const QgsRectangle &extent,
                                 int sampleSize,
                                 bool generateLookupTableFlag,
                                 QgsRasterRenderer *rasterRenderer );
 
    void refreshRenderer( QgsRasterRenderer *rasterRenderer, const QgsRectangle &extent );
 
    void computeMinMax( int band,
                        const QgsRasterMinMaxOrigin &mmo,
                        QgsRasterMinMaxOrigin::Limits limits,
                        const QgsRectangle &extent,
                        int sampleSize,
                        double &min, double &max );
 
    void setDataSourcePrivate( const QString &dataSource, const QString &baseName, const QString &provider, const QgsDataProvider::ProviderOptions &options, QgsDataProvider::ReadFlags flags ) override;
 
    const QString QSTRING_NOT_SET;
    const QString TRSTRING_NOT_SET;
 
    QgsRasterDataProvider *mDataProvider = nullptr;
 
    QgsRasterLayerTemporalProperties *mTemporalProperties = nullptr;
 
    QDateTime mLastModified;
 
    QgsRasterViewPort mLastViewPort;
 
    LayerType mRasterType = GrayOrUndefined;
 
    std::unique_ptr< QgsRasterPipe > mPipe;
 
    QgsRectangle mLastRectangleUsedByRefreshContrastEnhancementIfNeeded;
 
    QDomDocument mOriginalStyleDocument;
    QDomElement mOriginalStyleElement;
};
 
// clazy:excludeall=qstring-allocations
 
#endif