QgsRasterFileWriter::WriterError QgsRasterFileWriter::writeDataRaster( const QgsRasterPipe* pipe, QgsRasterIterator* iter, int nCols, int nRows, const QgsRectangle& outputExtent,
const QgsCoordinateReferenceSystem& crs, QProgressDialog* progressDialog )
{
QgsDebugMsg( "Entered" );
if ( !iter )
{
return SourceProviderError;
}
const QgsRasterInterface* iface = pipe->last();
if ( !iface )
{
return SourceProviderError;
}
QgsRasterDataProvider* srcProvider = const_cast<QgsRasterDataProvider*>( dynamic_cast<const QgsRasterDataProvider*>( iface->srcInput() ) );
if ( !srcProvider )
{
QgsDebugMsg( "Cannot get source data provider" );
return SourceProviderError;
}
iter->setMaximumTileWidth( mMaxTileWidth );
iter->setMaximumTileHeight( mMaxTileHeight );
int nBands = iface->bandCount();
if ( nBands < 1 )
{
return SourceProviderError;
}
//check if all the bands have the same data type size, otherwise we cannot write it to the provider
//(at least not with the current interface)
int dataTypeSize = QgsRasterBlock::typeSize( srcProvider->srcDataType( 1 ) );
for ( int i = 2; i <= nBands; ++i )
{
if ( QgsRasterBlock::typeSize( srcProvider->srcDataType( 1 ) ) != dataTypeSize )
{
return DestProviderError;
}
}
// Output data type - source data type is preferred but it may happen that we need
// to set 'no data' value (which was not set on source data) if output extent
// is larger than source extent (with or without reprojection) and there is no 'free'
// (not used) value available
QList<bool> destHasNoDataValueList;
QList<double> destNoDataValueList;
QList<QGis::DataType> destDataTypeList;
for ( int bandNo = 1; bandNo <= nBands; bandNo++ )
{
QgsRasterNuller *nuller = pipe->nuller();
bool srcHasNoDataValue = srcProvider->srcHasNoDataValue( bandNo );
bool destHasNoDataValue = false;
double destNoDataValue = std::numeric_limits<double>::quiet_NaN();
QGis::DataType destDataType = srcProvider->srcDataType( bandNo );
// TODO: verify what happens/should happen if srcNoDataValue is disabled by setUseSrcNoDataValue
QgsDebugMsg( QString( "srcHasNoDataValue = %1 srcNoDataValue = %2" ).arg( srcHasNoDataValue ).arg( srcProvider->srcNoDataValue( bandNo ) ) );
if ( srcHasNoDataValue )
{
// If source has no data value, it is used by provider
destNoDataValue = srcProvider->srcNoDataValue( bandNo );
destHasNoDataValue = true;
}
else if ( nuller && nuller->noData( bandNo ).size() > 0 )
{
// Use one user defined no data value
destNoDataValue = nuller->noData( bandNo ).value( 0 ).min();
destHasNoDataValue = true;
}
else
{
// Verify if we realy need no data value, i.e.
QgsRectangle srcExtent = outputExtent;
QgsRasterProjector *projector = pipe->projector();
if ( projector && projector->destCrs() != projector->srcCrs() )
{
QgsCoordinateTransform ct( projector->destCrs(), projector->srcCrs() );
srcExtent = ct.transformBoundingBox( outputExtent );
}
if ( !srcProvider->extent().contains( srcExtent ) )
{
// Destination extent is larger than source extent, we need destination no data values
// Get src sample statistics (estimation from sample)
QgsRasterBandStats stats = srcProvider->bandStatistics( bandNo, QgsRasterBandStats::Min | QgsRasterBandStats::Max, srcExtent, 250000 );
// Test if we have free (not used) values
double typeMinValue = QgsContrastEnhancement::maximumValuePossible(( QGis::DataType )srcProvider->srcDataType( bandNo ) );
double typeMaxValue = QgsContrastEnhancement::maximumValuePossible(( QGis::DataType )srcProvider->srcDataType( bandNo ) );
if ( stats.minimumValue > typeMinValue )
{
destNoDataValue = typeMinValue;
}
else if ( stats.maximumValue < typeMaxValue )
{
destNoDataValue = typeMaxValue;
}
else
{
// We have to use wider type
destDataType = QgsRasterBlock::typeWithNoDataValue( destDataType, &destNoDataValue );
}
destHasNoDataValue = true;
}
}
if ( nuller && destHasNoDataValue )
{
nuller->setOutputNoDataValue( bandNo, destNoDataValue );
}
QgsDebugMsg( QString( "bandNo = %1 destDataType = %2 destHasNoDataValue = %3 destNoDataValue = %4" ).arg( bandNo ).arg( destDataType ).arg( destHasNoDataValue ).arg( destNoDataValue ) );
destDataTypeList.append( destDataType );
destHasNoDataValueList.append( destHasNoDataValue );
destNoDataValueList.append( destNoDataValue );
}
QGis::DataType destDataType = destDataTypeList.value( 0 );
// Currently write API supports one output type for dataset only -> find the widest
for ( int i = 1; i < nBands; i++ )
{
if ( destDataTypeList.value( i ) > destDataType )
{
destDataType = destDataTypeList.value( i );
// no data value may be left per band (for future)
}
}
//create destProvider for whole dataset here
QgsRasterDataProvider* destProvider = 0;
double pixelSize;
double geoTransform[6];
globalOutputParameters( outputExtent, nCols, nRows, geoTransform, pixelSize );
// initOutput() returns 0 in tile mode!
destProvider = initOutput( nCols, nRows, crs, geoTransform, nBands, destDataType, destHasNoDataValueList, destNoDataValueList );
WriterError error = writeDataRaster( pipe, iter, nCols, nRows, outputExtent, crs, destDataType, destHasNoDataValueList, destNoDataValueList, destProvider, progressDialog );
if ( error == NoDataConflict )
{
// The value used for no data was found in source data, we must use wider data type
if ( destProvider ) // no tiles
{
destProvider->remove();
delete destProvider;
destProvider = 0;
}
else // VRT
{
// TODO: remove created VRT
}
// But we don't know which band -> wider all
for ( int i = 0; i < nBands; i++ )
{
double destNoDataValue;
QGis::DataType destDataType = QgsRasterBlock::typeWithNoDataValue( destDataTypeList.value( i ), &destNoDataValue );
destDataTypeList.replace( i, destDataType );
destNoDataValueList.replace( i, destNoDataValue );
}
destDataType = destDataTypeList.value( 0 );
// Try again
destProvider = initOutput( nCols, nRows, crs, geoTransform, nBands, destDataType, destHasNoDataValueList, destNoDataValueList );
error = writeDataRaster( pipe, iter, nCols, nRows, outputExtent, crs, destDataType, destHasNoDataValueList, destNoDataValueList, destProvider, progressDialog );
}
if ( destProvider )
delete destProvider;
return error;
}
QgsRasterFileWriter::WriterError QgsRasterFileWriter::writeRaster( const QgsRasterPipe* pipe, int nCols, int nRows, QgsRectangle outputExtent,
const QgsCoordinateReferenceSystem& crs, QProgressDialog* progressDialog )
{
QgsDebugMsg( "Entered" );
if ( !pipe )
{
return SourceProviderError;
}
mPipe = pipe;
//const QgsRasterInterface* iface = iter->input();
const QgsRasterInterface* iface = pipe->last();
if ( !iface )
{
return SourceProviderError;
}
mInput = iface;
if ( QgsRasterBlock::typeIsColor( iface->dataType( 1 ) ) )
{
mMode = Image;
}
else
{
mMode = Raw;
}
QgsDebugMsg( QString( "reading from %1" ).arg( typeid( *iface ).name() ) );
if ( !iface->srcInput() )
{
QgsDebugMsg( "iface->srcInput() == 0" );
return SourceProviderError;
}
QgsDebugMsg( QString( "srcInput = %1" ).arg( typeid( *( iface->srcInput() ) ).name() ) );
mProgressDialog = progressDialog;
QgsRasterIterator iter( pipe->last() );
//create directory for output files
if ( mTiledMode )
{
QFileInfo fileInfo( mOutputUrl );
if ( !fileInfo.exists() )
{
QDir dir = fileInfo.dir();
if ( !dir.mkdir( fileInfo.fileName() ) )
{
QgsDebugMsg( "Cannot create output VRT directory " + fileInfo.fileName() + " in " + dir.absolutePath() );
return CreateDatasourceError;
}
}
}
if ( mMode == Image )
{
WriterError e = writeImageRaster( &iter, nCols, nRows, outputExtent, crs, progressDialog );
mProgressDialog = 0;
return e;
}
else
{
mProgressDialog = 0;
WriterError e = writeDataRaster( pipe, &iter, nCols, nRows, outputExtent, crs, progressDialog );
return e;
}
}
QgsRasterFileWriter::WriterError QgsRasterFileWriter::writeRaster( const QgsRasterPipe *pipe, int nCols, int nRows, const QgsRectangle &outputExtent,
const QgsCoordinateReferenceSystem &crs, QgsRasterBlockFeedback *feedback )
{
QgsDebugMsgLevel( "Entered", 4 );
if ( !pipe )
{
return SourceProviderError;
}
mPipe = pipe;
//const QgsRasterInterface* iface = iter->input();
const QgsRasterInterface *iface = pipe->last();
if ( !iface )
{
return SourceProviderError;
}
mInput = iface;
if ( QgsRasterBlock::typeIsColor( iface->dataType( 1 ) ) )
{
mMode = Image;
}
else
{
mMode = Raw;
}
QgsDebugMsgLevel( QString( "reading from %1" ).arg( typeid( *iface ).name() ), 4 );
if ( !iface->sourceInput() )
{
QgsDebugMsg( "iface->srcInput() == 0" );
return SourceProviderError;
}
#ifdef QGISDEBUG
const QgsRasterInterface &srcInput = *iface->sourceInput();
QgsDebugMsgLevel( QString( "srcInput = %1" ).arg( typeid( srcInput ).name() ), 4 );
#endif
mFeedback = feedback;
QgsRasterIterator iter( pipe->last() );
//create directory for output files
if ( mTiledMode )
{
QFileInfo fileInfo( mOutputUrl );
if ( !fileInfo.exists() )
{
QDir dir = fileInfo.dir();
if ( !dir.mkdir( fileInfo.fileName() ) )
{
QgsDebugMsg( "Cannot create output VRT directory " + fileInfo.fileName() + " in " + dir.absolutePath() );
return CreateDatasourceError;
}
}
}
// Remove pre-existing overview files to avoid using those with new raster
QFile pyramidFile( mOutputUrl + ( mTiledMode ? ".vrt.ovr" : ".ovr" ) );
if ( pyramidFile.exists() )
pyramidFile.remove();
pyramidFile.setFileName( mOutputUrl + ( mTiledMode ? ".vrt.rrd" : ".rrd" ) );
if ( pyramidFile.exists() )
pyramidFile.remove();
if ( mMode == Image )
{
WriterError e = writeImageRaster( &iter, nCols, nRows, outputExtent, crs, feedback );
return e;
}
else
{
WriterError e = writeDataRaster( pipe, &iter, nCols, nRows, outputExtent, crs, feedback );
return e;
}
}