Iterator for sequentially processing raster cells. More...

Classes
struct	RasterPartInfo

Public Member Functions
	QgsRasterIterator (QgsRasterInterface *input)
	~QgsRasterIterator ()
void	startRasterRead (int bandNumber, int nCols, int nRows, const QgsRectangle &extent)
	Start reading of raster band.
bool	readNextRasterPart (int bandNumber, int &nCols, int &nRows, QgsRasterBlock **block, int &topLeftCol, int &topLeftRow)
	Fetches next part of raster data, caller takes ownership of the block and caller should delete the block.
void	stopRasterRead (int bandNumber)
const QgsRasterInterface *	input () const
void	setMaximumTileWidth (int w)
int	maximumTileWidth () const
void	setMaximumTileHeight (int h)
int	maximumTileHeight () const

Detailed Description

Iterator for sequentially processing raster cells.

Constructor & Destructor Documentation

QgsRasterIterator::QgsRasterIterator ( QgsRasterInterface * input )

QgsRasterIterator::~QgsRasterIterator ( )

const QgsRasterInterface* QgsRasterIterator::input ( ) const

inline

int QgsRasterIterator::maximumTileHeight ( ) const

inline

int QgsRasterIterator::maximumTileWidth ( ) const

inline

bool QgsRasterIterator::readNextRasterPart	(	int	bandNumber,
		int &	nCols,
		int &	nRows,
		QgsRasterBlock **	block,
		int &	topLeftCol,
		int &	topLeftRow
	)

Fetches next part of raster data, caller takes ownership of the block and caller should delete the block.

Parameters

bandNumber	band to read
nCols	number of columns on output device
nRows	number of rows on output device
block	address of block pointer
topLeftCol	top left column
topLeftRow	top left row

void QgsRasterIterator::setMaximumTileHeight ( int h )

inline

void QgsRasterIterator::setMaximumTileWidth ( int w )

inline

void QgsRasterIterator::startRasterRead	(	int	bandNumber,
		int	nCols,
		int	nRows,
		const QgsRectangle &	extent
	)

Start reading of raster band.

Raster data can then be retrieved by calling readNextRasterPart until it returns false.

Parameters

void QgsRasterIterator::stopRasterRead ( int bandNumber )

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