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b6b5afd885
The improvement allows immediate cancellation of raster rendering in progress. Until now, even when map rendering got cancelled (e.g. by zooming of panning canvas), the GUI got blocked while waiting for raster layers to finish their rendering (only vector layers have had support for cancellation). This should allow for much smoother user experience while browsing maps including rasters. The cancellation is supported currently by WMS/WMTS and WCS providers. GDAL provider may also get support thanks to improvements in GDAL 2. Funded by Land Information New Zealand.
83 lines
2.4 KiB
Plaintext
83 lines
2.4 KiB
Plaintext
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class QgsRasterRenderer : QgsRasterInterface
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{
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%TypeHeaderCode
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#include "qgsrasterrenderer.h"
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%End
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public:
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// Origin of min / max values
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enum MinMaxOrigin
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{
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MinMaxUnknown,
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MinMaxUser, // entered by user
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// method
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MinMaxMinMax,
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MinMaxCumulativeCut,
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MinMaxStdDev,
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// Extent
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MinMaxFullExtent,
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MinMaxSubExtent,
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// Precision
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MinMaxEstimated,
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MinMaxExact
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};
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static const QRgb NODATA_COLOR;
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QgsRasterRenderer( QgsRasterInterface* input = 0, const QString& type = "" );
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virtual ~QgsRasterRenderer();
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virtual QgsRasterRenderer * clone() const = 0 /Factory/;
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virtual int bandCount() const;
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virtual Qgis::DataType dataType( int bandNo ) const;
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virtual QString type() const;
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virtual bool setInput( QgsRasterInterface* input );
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virtual QgsRasterBlock *block( int bandNo, const QgsRectangle &extent, int width, int height, QgsRasterBlockFeedback* feedback = nullptr ) = 0 / Factory /;
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bool usesTransparency() const;
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void setOpacity( double opacity );
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double opacity() const;
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void setRasterTransparency( QgsRasterTransparency* t /Transfer/);
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const QgsRasterTransparency* rasterTransparency() const;
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void setAlphaBand( int band );
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int alphaBand() const;
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/** Get symbology items if provided by renderer*/
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virtual void legendSymbologyItems( QList< QPair< QString, QColor > >& symbolItems ) const;
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/** Sets base class members from xml. Usually called from create() methods of subclasses*/
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void readXml( const QDomElement& rendererElem );
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/** Copies common properties like opacity / transparency data from other renderer.
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* Useful when cloning renderers.
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* @note added in 2.16 */
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void copyCommonProperties( const QgsRasterRenderer* other );
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/** Returns a list of band numbers used by the renderer*/
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virtual QList<int> usesBands() const;
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static QString minMaxOriginName( int theOrigin );
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static QString minMaxOriginLabel( int theOrigin );
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static int minMaxOriginFromName( const QString& theName );
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protected:
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/** Write upper class info into rasterrenderer element (called by writeXML method of subclasses)*/
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void _writeXml( QDomDocument& doc, QDomElement& rasterRendererElem ) const;
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private:
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QgsRasterRenderer( const QgsRasterRenderer& );
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const QgsRasterRenderer& operator=( const QgsRasterRenderer& );
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};
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