QGIS API Documentation  2.99.0-Master (f867b65)
Public Types | Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
QgsRasterInterface Class Referenceabstract

Base class for processing filters like renderers, reprojector, resampler etc. More...

#include <qgsrasterinterface.h>

Inheritance diagram for QgsRasterInterface:
Inheritance graph
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Public Types

enum  Capability {
  NoCapabilities = 0, Size = 1 << 1, Create = 1 << 2, Remove = 1 << 3,
  BuildPyramids = 1 << 4, Identify = 1 << 5, IdentifyValue = 1 << 6, IdentifyText = 1 << 7,
  IdentifyHtml = 1 << 8, IdentifyFeature = 1 << 9
}
 If you add to this, please also add to capabilitiesString() More...
 

Public Member Functions

 QgsRasterInterface (QgsRasterInterface *input=nullptr)
 
virtual ~QgsRasterInterface ()=default
 
virtual int bandCount () const =0
 Get number of bands. More...
 
virtual QgsRasterBandStats bandStatistics (int bandNo, int stats=QgsRasterBandStats::All, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0, QgsRasterBlockFeedback *feedback=nullptr)
 Get band statistics. More...
 
virtual QgsRasterBlockblock (int bandNo, const QgsRectangle &extent, int width, int height, QgsRasterBlockFeedback *feedback=nullptr)=0
 Read block of data using given extent and size. More...
 
virtual int capabilities () const
 Returns a bitmask containing the supported capabilities. More...
 
QString capabilitiesString () const
 Returns the above in friendly format. More...
 
virtual QgsRasterInterfaceclone () const =0
 Clone itself, create deep copy. More...
 
virtual void cumulativeCut (int bandNo, double lowerCount, double upperCount, double &lowerValue, double &upperValue, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0)
 Find values for cumulative pixel count cut. More...
 
virtual Qgis::DataType dataType (int bandNo) const =0
 Returns data type for the band specified by number. More...
 
int dataTypeSize (int bandNo)
 
virtual QgsRectangle extent () const
 Get the extent of the interface. More...
 
virtual QString generateBandName (int bandNumber) const
 helper function to create zero padded band names More...
 
virtual bool hasHistogram (int bandNo, int binCount, double minimum=std::numeric_limits< double >::quiet_NaN(), double maximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &extent=QgsRectangle(), int sampleSize=0, bool includeOutOfRange=false)
 Returns true if histogram is available (cached, already calculated) More...
 
virtual bool hasStatistics (int bandNo, int stats=QgsRasterBandStats::All, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0)
 Returns true if histogram is available (cached, already calculated). More...
 
virtual QgsRasterHistogram histogram (int bandNo, int binCount=0, double minimum=std::numeric_limits< double >::quiet_NaN(), double maximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &extent=QgsRectangle(), int sampleSize=0, bool includeOutOfRange=false, QgsRasterBlockFeedback *feedback=nullptr)
 Get histogram. More...
 
virtual QgsRasterInterfaceinput () const
 Current input. More...
 
virtual bool on () const
 Is on/off. More...
 
virtual void readXml (const QDomElement &filterElem)
 Sets base class members from xml. Usually called from create() methods of subclasses. More...
 
virtual bool setInput (QgsRasterInterface *input)
 Set input. More...
 
virtual void setOn (bool on)
 Set on/off. More...
 
virtual Qgis::DataType sourceDataType (int bandNo) const
 Returns source data type for the band specified by number, source data type may be shorter than dataType. More...
 
virtual const QgsRasterInterfacesourceInput () const
 Get source / raw input, the first in pipe, usually provider. More...
 
virtual QgsRasterInterfacesourceInput ()
 Get source / raw input, the first in pipe, usually provider. More...
 
virtual void writeXml (QDomDocument &doc, QDomElement &parentElem) const
 Write base class members to xml. More...
 
virtual int xBlockSize () const
 Get block size. More...
 
virtual int xSize () const
 Get raster size. More...
 
virtual int yBlockSize () const
 
virtual int ySize () const
 

Protected Member Functions

void initHistogram (QgsRasterHistogram &histogram, int bandNo, int binCount, double minimum=std::numeric_limits< double >::quiet_NaN(), double maximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &boundingBox=QgsRectangle(), int sampleSize=0, bool includeOutOfRange=false)
 Fill in histogram defaults if not specified. More...
 
void initStatistics (QgsRasterBandStats &statistics, int bandNo, int stats=QgsRasterBandStats::All, const QgsRectangle &boundingBox=QgsRectangle(), int binCount=0)
 Fill in statistics defaults if not specified. More...
 

Protected Attributes

QList< QgsRasterHistogrammHistograms
 List of cached histograms, all bands mixed. More...
 
QgsRasterInterfacemInput = nullptr
 
bool mOn
 
QList< QgsRasterBandStatsmStatistics
 List of cached statistics, all bands mixed. More...
 

Detailed Description

Base class for processing filters like renderers, reprojector, resampler etc.

Definition at line 78 of file qgsrasterinterface.h.

Member Enumeration Documentation

◆ Capability

If you add to this, please also add to capabilitiesString()

Enumerator
NoCapabilities 
Size 
Create 
Remove 
BuildPyramids 
Identify 
IdentifyValue 
IdentifyText 
IdentifyHtml 
IdentifyFeature 

Definition at line 145 of file qgsrasterinterface.h.

Constructor & Destructor Documentation

◆ QgsRasterInterface()

QgsRasterInterface::QgsRasterInterface ( QgsRasterInterface input = nullptr)

Definition at line 33 of file qgsrasterinterface.cpp.

◆ ~QgsRasterInterface()

virtual QgsRasterInterface::~QgsRasterInterface ( )
virtualdefault

Member Function Documentation

◆ bandCount()

virtual int QgsRasterInterface::bandCount ( ) const
pure virtual

◆ bandStatistics()

QgsRasterBandStats QgsRasterInterface::bandStatistics ( int  bandNo,
int  stats = QgsRasterBandStats::All,
const QgsRectangle extent = QgsRectangle(),
int  sampleSize = 0,
QgsRasterBlockFeedback feedback = nullptr 
)
virtual

Get band statistics.

Parameters
bandNoThe band (number).
statsRequested statistics
extentExtent used to calc statistics, if empty, whole raster extent is used.
sampleSizeApproximate number of cells in sample. If 0, all cells (whole raster will be used). If raster does not have exact size (WCS without exact size for example), provider decides size of sample.
feedbackoptional feedback object
Returns
Band statistics.

Definition at line 118 of file qgsrasterinterface.cpp.

◆ block()

virtual QgsRasterBlock* QgsRasterInterface::block ( int  bandNo,
const QgsRectangle extent,
int  width,
int  height,
QgsRasterBlockFeedback feedback = nullptr 
)
pure virtual

Read block of data using given extent and size.

Returns pointer to data. Caller is responsible to free the memory returned.

Parameters
bandNoband number
extentextent of block
widthpixel width of block
heightpixel height of block
feedbackoptional raster feedback object for cancelation/preview. Added in QGIS 3.0.

Implemented in QgsRasterDataProvider, QgsRasterProjector, QgsPalettedRasterRenderer, QgsRasterRenderer, QgsHillshadeRenderer, QgsHueSaturationFilter, QgsSingleBandGrayRenderer, QgsSingleBandPseudoColorRenderer, QgsMultiBandColorRenderer, QgsRasterNuller, QgsSingleBandColorDataRenderer, QgsRasterResampleFilter, and QgsBrightnessContrastFilter.

◆ capabilities()

virtual int QgsRasterInterface::capabilities ( ) const
inlinevirtual

Returns a bitmask containing the supported capabilities.

Definition at line 167 of file qgsrasterinterface.h.

◆ capabilitiesString()

QString QgsRasterInterface::capabilitiesString ( ) const

Returns the above in friendly format.

Definition at line 575 of file qgsrasterinterface.cpp.

◆ clone()

virtual QgsRasterInterface* QgsRasterInterface::clone ( ) const
pure virtual

◆ cumulativeCut()

void QgsRasterInterface::cumulativeCut ( int  bandNo,
double  lowerCount,
double  upperCount,
double &  lowerValue,
double &  upperValue,
const QgsRectangle extent = QgsRectangle(),
int  sampleSize = 0 
)
virtual

Find values for cumulative pixel count cut.

Parameters
bandNoThe band (number).
lowerCountThe lower count as fraction of 1, e.g. 0.02 = 2%
upperCountThe upper count as fraction of 1, e.g. 0.98 = 98%
lowerValueLocation into which the lower value will be set.
upperValueLocation into which the upper value will be set.
extentExtent used to calc histogram, if empty, whole raster extent is used.
sampleSizeApproximate number of cells in sample. If 0, all cells (whole raster will be used). If raster does not have exact size (WCS without exact size for example), provider decides size of sample.

Definition at line 513 of file qgsrasterinterface.cpp.

◆ dataType()

virtual Qgis::DataType QgsRasterInterface::dataType ( int  bandNo) const
pure virtual

◆ dataTypeSize()

int QgsRasterInterface::dataTypeSize ( int  bandNo)
inline

Definition at line 190 of file qgsrasterinterface.h.

◆ extent()

virtual QgsRectangle QgsRasterInterface::extent ( ) const
inlinevirtual

Get the extent of the interface.

Returns
QgsRectangle containing the extent of the layer

Reimplemented in QgsRasterDataProvider.

Definition at line 188 of file qgsrasterinterface.h.

◆ generateBandName()

virtual QString QgsRasterInterface::generateBandName ( int  bandNumber) const
inlinevirtual

helper function to create zero padded band names

Definition at line 204 of file qgsrasterinterface.h.

◆ hasHistogram()

bool QgsRasterInterface::hasHistogram ( int  bandNo,
int  binCount,
double  minimum = std::numeric_limits<double>::quiet_NaN(),
double  maximum = std::numeric_limits<double>::quiet_NaN(),
const QgsRectangle extent = QgsRectangle(),
int  sampleSize = 0,
bool  includeOutOfRange = false 
)
virtual

Returns true if histogram is available (cached, already calculated)

Note
the parameters are the same as in
See also
histogram()

Definition at line 369 of file qgsrasterinterface.cpp.

◆ hasStatistics()

bool QgsRasterInterface::hasStatistics ( int  bandNo,
int  stats = QgsRasterBandStats::All,
const QgsRectangle extent = QgsRectangle(),
int  sampleSize = 0 
)
virtual

Returns true if histogram is available (cached, already calculated).

  • The parameters are the same as in bandStatistics()
    Returns
    true if statistics are available (ready to use)

Definition at line 96 of file qgsrasterinterface.cpp.

◆ histogram()

QgsRasterHistogram QgsRasterInterface::histogram ( int  bandNo,
int  binCount = 0,
double  minimum = std::numeric_limits<double>::quiet_NaN(),
double  maximum = std::numeric_limits<double>::quiet_NaN(),
const QgsRectangle extent = QgsRectangle(),
int  sampleSize = 0,
bool  includeOutOfRange = false,
QgsRasterBlockFeedback feedback = nullptr 
)
virtual

Get histogram.

Histograms are cached in providers.

Parameters
bandNoThe band (number).
binCountNumber of bins (intervals,buckets). If 0, the number of bins is decided automatically according to data type, raster size etc.
minimumMinimum value, if NaN (None for Python), raster minimum value will be used.
maximumMaximum value, if NaN (None for Python), raster maximum value will be used.
extentExtent used to calc histogram, if empty, whole raster extent is used.
sampleSizeApproximate number of cells in sample. If 0, all cells (whole raster will be used). If raster does not have exact size (WCS without exact size for example), provider decides size of sample.
includeOutOfRangeinclude out of range values
feedbackoptional feedback object
Returns
Vector of non NULL cell counts for each bin.
Note
binCount, minimum and maximum not optional in Python bindings

Definition at line 395 of file qgsrasterinterface.cpp.

◆ initHistogram()

void QgsRasterInterface::initHistogram ( QgsRasterHistogram histogram,
int  bandNo,
int  binCount,
double  minimum = std::numeric_limits<double>::quiet_NaN(),
double  maximum = std::numeric_limits<double>::quiet_NaN(),
const QgsRectangle boundingBox = QgsRectangle(),
int  sampleSize = 0,
bool  includeOutOfRange = false 
)
protected

Fill in histogram defaults if not specified.

Note
the parameters are the same as in
See also
histogram()

Definition at line 248 of file qgsrasterinterface.cpp.

◆ initStatistics()

void QgsRasterInterface::initStatistics ( QgsRasterBandStats statistics,
int  bandNo,
int  stats = QgsRasterBandStats::All,
const QgsRectangle boundingBox = QgsRectangle(),
int  binCount = 0 
)
protected

Fill in statistics defaults if not specified.

Definition at line 39 of file qgsrasterinterface.cpp.

◆ input()

virtual QgsRasterInterface* QgsRasterInterface::input ( ) const
inlinevirtual

Current input.

Definition at line 225 of file qgsrasterinterface.h.

◆ on()

virtual bool QgsRasterInterface::on ( ) const
inlinevirtual

Is on/off.

Definition at line 228 of file qgsrasterinterface.h.

◆ readXml()

virtual void QgsRasterInterface::readXml ( const QDomElement &  filterElem)
inlinevirtual

Sets base class members from xml. Usually called from create() methods of subclasses.

Reimplemented in QgsRasterRenderer, QgsHueSaturationFilter, QgsRasterResampleFilter, and QgsBrightnessContrastFilter.

Definition at line 413 of file qgsrasterinterface.h.

◆ setInput()

virtual bool QgsRasterInterface::setInput ( QgsRasterInterface input)
inlinevirtual

Set input.

Returns true if set correctly, false if cannot use that input

Reimplemented in QgsRasterDataProvider, QgsRasterRenderer, QgsHueSaturationFilter, QgsSingleBandColorDataRenderer, QgsRasterResampleFilter, and QgsBrightnessContrastFilter.

Definition at line 222 of file qgsrasterinterface.h.

◆ setOn()

virtual void QgsRasterInterface::setOn ( bool  on)
inlinevirtual

Set on/off.

Definition at line 231 of file qgsrasterinterface.h.

◆ sourceDataType()

virtual Qgis::DataType QgsRasterInterface::sourceDataType ( int  bandNo) const
inlinevirtual

Returns source data type for the band specified by number, source data type may be shorter than dataType.

Reimplemented in QgsRasterDataProvider.

Definition at line 182 of file qgsrasterinterface.h.

◆ sourceInput() [1/2]

virtual const QgsRasterInterface* QgsRasterInterface::sourceInput ( ) const
inlinevirtual

Get source / raw input, the first in pipe, usually provider.

It may be used to get info about original data, e.g. resolution to decide resampling etc.

Note
not available in Python bindings.

Definition at line 238 of file qgsrasterinterface.h.

◆ sourceInput() [2/2]

virtual QgsRasterInterface* QgsRasterInterface::sourceInput ( )
inlinevirtual

Get source / raw input, the first in pipe, usually provider.

It may be used to get info about original data, e.g. resolution to decide resampling etc.

Definition at line 248 of file qgsrasterinterface.h.

◆ writeXml()

virtual void QgsRasterInterface::writeXml ( QDomDocument &  doc,
QDomElement &  parentElem 
) const
inlinevirtual

◆ xBlockSize()

virtual int QgsRasterInterface::xBlockSize ( ) const
inlinevirtual

Get block size.

Definition at line 196 of file qgsrasterinterface.h.

◆ xSize()

virtual int QgsRasterInterface::xSize ( ) const
inlinevirtual

Get raster size.

Definition at line 200 of file qgsrasterinterface.h.

◆ yBlockSize()

virtual int QgsRasterInterface::yBlockSize ( ) const
inlinevirtual

Definition at line 197 of file qgsrasterinterface.h.

◆ ySize()

virtual int QgsRasterInterface::ySize ( ) const
inlinevirtual

Definition at line 201 of file qgsrasterinterface.h.

Member Data Documentation

◆ mHistograms

QList<QgsRasterHistogram> QgsRasterInterface::mHistograms
protected

List of cached histograms, all bands mixed.

Definition at line 423 of file qgsrasterinterface.h.

◆ mInput

QgsRasterInterface* QgsRasterInterface::mInput = nullptr
protected

Definition at line 417 of file qgsrasterinterface.h.

◆ mOn

bool QgsRasterInterface::mOn
protected

Definition at line 426 of file qgsrasterinterface.h.

◆ mStatistics

QList<QgsRasterBandStats> QgsRasterInterface::mStatistics
protected

List of cached statistics, all bands mixed.

Definition at line 420 of file qgsrasterinterface.h.


The documentation for this class was generated from the following files: