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[API] convenience API call to create empty raster file with given

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number of bands. Will be useful for porting raster analysis code
to use QgsRasterBlock instead of GDAL calls.

Follow up ff8d91214748e0363010e263401212d0b4e0e491
This commit is contained in:
Alexander Bruy 2017-05-19 15:52:58 +03:00
parent 90bef91d66
commit 9272dc0f7c
3 changed files with 38 additions and 0 deletions
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15
python/core/raster/qgsrasterfilewriter.sip
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@ -53,6 +53,21 @@ class QgsRasterFileWriter
:rtype: QgsRasterDataProvider
%End
QgsRasterDataProvider *createRaster( Qgis::DataType dataType,
int width, int height, const QgsRectangle &extent,
int nBands, const QgsCoordinateReferenceSystem &crs ) /Factory/;
%Docstring
Create a raster file with given number of bands without initializing the pixel data.
Returned provider may be used to initialize the raster using writeBlock() calls.
Ownership of the returned provider is passed to the caller.
.. note::
Does not work with tiled mode enabled.
:return: Instance of data provider in editing mode (on success) or None on error.
.. versionadded:: 3.0
:rtype: QgsRasterDataProvider
%End
WriterError writeRaster( const QgsRasterPipe *pipe, int nCols, int nRows, const QgsRectangle &outputExtent,
const QgsCoordinateReferenceSystem &crs, QgsRasterBlockFeedback *feedback = 0 );
%Docstring

12
src/core/raster/qgsrasterfilewriter.cpp
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@ -41,6 +41,18 @@ QgsRasterDataProvider *QgsRasterFileWriter::createOneBandRaster( Qgis::DataType
return initOutput( width, height, crs, geoTransform, 1, dataType, QList<bool>(), QList<double>() );
}
QgsRasterDataProvider *QgsRasterFileWriter::createRaster( Qgis::DataType dataType, int width, int height, const QgsRectangle &extent, int nBands, const QgsCoordinateReferenceSystem &crs )
{
if ( mTiledMode )
return nullptr; // does not make sense with tiled mode
double pixelSize;
double geoTransform[6];
globalOutputParameters( extent, width, height, geoTransform, pixelSize );
return initOutput( width, height, crs, geoTransform, nBands, dataType, QList<bool>(), QList<double>() );
}
QgsRasterFileWriter::QgsRasterFileWriter( const QString &outputUrl )
: mMode( Raw )
, mOutputUrl( outputUrl )

11
src/core/raster/qgsrasterfilewriter.h
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@ -67,6 +67,17 @@ class CORE_EXPORT QgsRasterFileWriter
const QgsRectangle &extent,
const QgsCoordinateReferenceSystem &crs ) SIP_FACTORY;
/** Create a raster file with given number of bands without initializing the pixel data.
* Returned provider may be used to initialize the raster using writeBlock() calls.
* Ownership of the returned provider is passed to the caller.
* \note Does not work with tiled mode enabled.
* \returns Instance of data provider in editing mode (on success) or nullptr on error.
* \since QGIS 3.0
*/
QgsRasterDataProvider *createRaster( Qgis::DataType dataType,
int width, int height, const QgsRectangle &extent,
int nBands, const QgsCoordinateReferenceSystem &crs ) SIP_FACTORY;
/** Write raster file
\param pipe raster pipe
\param nCols number of output columns