qgsrasterlayer.h

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/***************************************************************************
                        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.h"
#include "qgsmaplayer.h"
#include "qgsraster.h"
#include "qgsrasterdataprovider.h"
#include "qgsrasterpipe.h"
#include "qgsrasterviewport.h"
#include "qgsrasterminmaxorigin.h"
#include "qgscontrastenhancement.h"

class QgsMapToPixel;
class QgsRasterRenderer;
class QgsRectangle;
class QImage;
class QLibrary;
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 )
        : loadDefaultStyle( loadDefaultStyle )
      {}

      bool loadDefaultStyle = true;
    };

    explicit QgsRasterLayer( const QString &uri,
                             const QString &baseName = QString(),
                             const QString &providerKey = "gdal",
                             const QgsRasterLayer::LayerOptions &options = QgsRasterLayer::LayerOptions() );

    ~QgsRasterLayer() override;

    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 );
    static bool isValidRasterFileName( const QString &fileNameQString );

    static QDateTime lastModified( const QString   &name );

    void setDataProvider( const QString &provider );

    LayerType rasterType() { return mRasterType; }

    void setRenderer( QgsRasterRenderer *renderer SIP_TRANSFER );
    QgsRasterRenderer *renderer() const { return mPipe.renderer(); }

    QgsRasterResampleFilter *resampleFilter() const { return mPipe.resampleFilter(); }

    QgsBrightnessContrastFilter *brightnessFilter() const { return mPipe.brightnessFilter(); }
    QgsHueSaturationFilter *hueSaturationFilter() const { return mPipe.hueSaturationFilter(); }

    QgsRasterPipe *pipe() { return &mPipe; }

    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 );

    QgsLegendColorList legendSymbologyItems() const;

    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 setContrastEnhancement( QgsContrastEnhancement::ContrastEnhancementAlgorithm algorithm,
                                 QgsRasterMinMaxOrigin::Limits limits = QgsRasterMinMaxOrigin::MinMax,
                                 const QgsRectangle &extent = QgsRectangle(),
                                 int sampleSize = QgsRasterLayer::SAMPLE_SIZE,
                                 bool generateLookupTableFlag = true );

    // Used by QgisApp::legendLayerStretchUsingCurrentExtent()
    void refreshContrastEnhancement( const QgsRectangle &extent ) SIP_SKIP;

    // Used by QgsRasterLayerRenderer
    void refreshRendererIfNeeded( QgsRasterRenderer *rasterRenderer, const QgsRectangle &extent ) SIP_SKIP;

    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;

  public slots:
    void showStatusMessage( const QString &message );

  protected:
    bool readSymbology( const QDomNode &node, QString &errorMessage, const QgsReadWriteContext &context ) override;

    bool readStyle( const QDomNode &node, QString &errorMessage, const QgsReadWriteContext &context ) override;

    bool readXml( const QDomNode &layer_node, const QgsReadWriteContext &context ) override;

    bool writeSymbology( QDomNode &, QDomDocument &doc, QString &errorMessage, const QgsReadWriteContext &context ) const override;

    bool writeStyle( QDomNode &node, QDomDocument &doc, QString &errorMessage, const QgsReadWriteContext &context ) const override;

    bool writeXml( QDomNode &layer_node, QDomDocument &doc, 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 computeMinMax( int band,
                        const QgsRasterMinMaxOrigin &mmo,
                        QgsRasterMinMaxOrigin::Limits limits,
                        const QgsRectangle &extent,
                        int sampleSize,
                        double &min, double &max );

    const QString QSTRING_NOT_SET;
    const QString TRSTRING_NOT_SET;

    QgsRasterDataProvider *mDataProvider = nullptr;

    QDateTime mLastModified;

    QgsRasterViewPort mLastViewPort;

    QString mProviderKey;

    LayerType mRasterType;

    QgsRasterPipe mPipe;

    QgsRectangle mLastRectangleUsedByRefreshContrastEnhancementIfNeeded;
};

// clazy:excludeall=qstring-allocations

#endif