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46 lines
1.6 KiB
Plaintext
46 lines
1.6 KiB
Plaintext
class QgsRasterIterator
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{
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%TypeHeaderCode
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#include <qgsrasteriterator.h>
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%End
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public:
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QgsRasterIterator( QgsRasterInterface *input );
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/** Start reading of raster band. Raster data can then be retrieved by calling readNextRasterPart until it returns false.
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@param bandNumber number of raster band to read
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@param nCols number of columns
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@param nRows number of rows
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@param extent area to read
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@param feedback optional raster feedback object for cancelation/preview. Added in QGIS 3.0.
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*/
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void startRasterRead( int bandNumber, int nCols, int nRows, const QgsRectangle &extent, QgsRasterBlockFeedback *feedback = 0 );
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/** Fetches next part of raster data, caller takes ownership of the block and
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caller should delete the block.
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@param bandNumber band to read
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@param nCols number of columns on output device
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@param nRows number of rows on output device
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@param block address of block pointer
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@param topLeftCol top left column
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@param topLeftRow top left row
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@return false if the last part was already returned*/
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bool readNextRasterPart( int bandNumber,
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int& nCols, int& nRows,
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QgsRasterBlock **block,
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int &topLeftCol, int &topLeftRow );
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void stopRasterRead( int bandNumber );
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const QgsRasterInterface *input() const;
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void setMaximumTileWidth( int w );
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int maximumTileWidth() const;
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void setMaximumTileHeight( int h );
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int maximumTileHeight() const;
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static const int DEFAULT_MAXIMUM_TILE_WIDTH;
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static const int DEFAULT_MAXIMUM_TILE_HEIGHT;
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};
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