int QgsRelief::processRaster( QgsFeedback *feedback )
{
//open input file
int xSize, ySize;
GDALDatasetH inputDataset = openInputFile( xSize, ySize );
if ( !inputDataset )
{
return 1; //opening of input file failed
}
//output driver
GDALDriverH outputDriver = openOutputDriver();
if ( !outputDriver )
{
return 2;
}
GDALDatasetH outputDataset = openOutputFile( inputDataset, outputDriver );
if ( !outputDataset )
{
return 3; //create operation on output file failed
}
//initialize dependency filters with cell sizes
mHillshadeFilter285->setCellSizeX( mCellSizeX );
mHillshadeFilter285->setCellSizeY( mCellSizeY );
mHillshadeFilter285->setZFactor( mZFactor );
mHillshadeFilter300->setCellSizeX( mCellSizeX );
mHillshadeFilter300->setCellSizeY( mCellSizeY );
mHillshadeFilter300->setZFactor( mZFactor );
mHillshadeFilter315->setCellSizeX( mCellSizeX );
mHillshadeFilter315->setCellSizeY( mCellSizeY );
mHillshadeFilter315->setZFactor( mZFactor );
mSlopeFilter->setCellSizeX( mCellSizeX );
mSlopeFilter->setCellSizeY( mCellSizeY );
mSlopeFilter->setZFactor( mZFactor );
mAspectFilter->setCellSizeX( mCellSizeX );
mAspectFilter->setCellSizeY( mCellSizeY );
mAspectFilter->setZFactor( mZFactor );
//open first raster band for reading (operation is only for single band raster)
GDALRasterBandH rasterBand = GDALGetRasterBand( inputDataset, 1 );
if ( !rasterBand )
{
GDALClose( inputDataset );
GDALClose( outputDataset );
return 4;
}
mInputNodataValue = GDALGetRasterNoDataValue( rasterBand, nullptr );
mSlopeFilter->setInputNodataValue( mInputNodataValue );
mAspectFilter->setInputNodataValue( mInputNodataValue );
mHillshadeFilter285->setInputNodataValue( mInputNodataValue );
mHillshadeFilter300->setInputNodataValue( mInputNodataValue );
mHillshadeFilter315->setInputNodataValue( mInputNodataValue );
GDALRasterBandH outputRedBand = GDALGetRasterBand( outputDataset, 1 );
GDALRasterBandH outputGreenBand = GDALGetRasterBand( outputDataset, 2 );
GDALRasterBandH outputBlueBand = GDALGetRasterBand( outputDataset, 3 );
if ( !outputRedBand || !outputGreenBand || !outputBlueBand )
{
GDALClose( inputDataset );
GDALClose( outputDataset );
return 5;
}
//try to set -9999 as nodata value
GDALSetRasterNoDataValue( outputRedBand, -9999 );
GDALSetRasterNoDataValue( outputGreenBand, -9999 );
GDALSetRasterNoDataValue( outputBlueBand, -9999 );
mOutputNodataValue = GDALGetRasterNoDataValue( outputRedBand, nullptr );
mSlopeFilter->setOutputNodataValue( mOutputNodataValue );
mAspectFilter->setOutputNodataValue( mOutputNodataValue );
mHillshadeFilter285->setOutputNodataValue( mOutputNodataValue );
mHillshadeFilter300->setOutputNodataValue( mOutputNodataValue );
mHillshadeFilter315->setOutputNodataValue( mOutputNodataValue );
if ( ySize < 3 ) //we require at least three rows (should be true for most datasets)
{
GDALClose( inputDataset );
GDALClose( outputDataset );
return 6;
}
//keep only three scanlines in memory at a time
float *scanLine1 = ( float * ) CPLMalloc( sizeof( float ) * xSize );
float *scanLine2 = ( float * ) CPLMalloc( sizeof( float ) * xSize );
float *scanLine3 = ( float * ) CPLMalloc( sizeof( float ) * xSize );
unsigned char *resultRedLine = ( unsigned char * ) CPLMalloc( sizeof( unsigned char ) * xSize );
unsigned char *resultGreenLine = ( unsigned char * ) CPLMalloc( sizeof( unsigned char ) * xSize );
unsigned char *resultBlueLine = ( unsigned char * ) CPLMalloc( sizeof( unsigned char ) * xSize );
bool resultOk;
//values outside the layer extent (if the 3x3 window is on the border) are sent to the processing method as (input) nodata values
for ( int i = 0; i < ySize; ++i )
{
if ( feedback )
{
feedback->setProgress( 100.0 * i / static_cast< double >( ySize ) );
}
if ( feedback && feedback->isCanceled() )
{
break;
}
if ( i == 0 )
{
//fill scanline 1 with (input) nodata for the values above the first row and feed scanline2 with the first row
for ( int a = 0; a < xSize; ++a )
{
scanLine1[a] = mInputNodataValue;
}
if ( GDALRasterIO( rasterBand, GF_Read, 0, 0, xSize, 1, scanLine2, xSize, 1, GDT_Float32, 0, 0 ) != CE_None )
{
QgsDebugMsg( "Raster IO Error" );
}
}
else
{
//normally fetch only scanLine3 and release scanline 1 if we move forward one row
CPLFree( scanLine1 );
scanLine1 = scanLine2;
scanLine2 = scanLine3;
scanLine3 = ( float * ) CPLMalloc( sizeof( float ) * xSize );
}
if ( i == ySize - 1 ) //fill the row below the bottom with nodata values
{
for ( int a = 0; a < xSize; ++a )
{
scanLine3[a] = mInputNodataValue;
}
}
else
{
if ( GDALRasterIO( rasterBand, GF_Read, 0, i + 1, xSize, 1, scanLine3, xSize, 1, GDT_Float32, 0, 0 ) != CE_None )
{
QgsDebugMsg( "Raster IO Error" );
}
}
for ( int j = 0; j < xSize; ++j )
{
if ( j == 0 )
{
resultOk = processNineCellWindow( &mInputNodataValue, &scanLine1[j], &scanLine1[j + 1], &mInputNodataValue, &scanLine2[j], \
&scanLine2[j + 1], &mInputNodataValue, &scanLine3[j], &scanLine3[j + 1], \
&resultRedLine[j], &resultGreenLine[j], &resultBlueLine[j] );
}
else if ( j == xSize - 1 )
{
resultOk = processNineCellWindow( &scanLine1[j - 1], &scanLine1[j], &mInputNodataValue, &scanLine2[j - 1], &scanLine2[j], \
&mInputNodataValue, &scanLine3[j - 1], &scanLine3[j], &mInputNodataValue, \
&resultRedLine[j], &resultGreenLine[j], &resultBlueLine[j] );
}
else
{
resultOk = processNineCellWindow( &scanLine1[j - 1], &scanLine1[j], &scanLine1[j + 1], &scanLine2[j - 1], &scanLine2[j], \
&scanLine2[j + 1], &scanLine3[j - 1], &scanLine3[j], &scanLine3[j + 1], \
&resultRedLine[j], &resultGreenLine[j], &resultBlueLine[j] );
}
if ( !resultOk )
{
resultRedLine[j] = mOutputNodataValue;
resultGreenLine[j] = mOutputNodataValue;
resultBlueLine[j] = mOutputNodataValue;
}
}
if ( GDALRasterIO( outputRedBand, GF_Write, 0, i, xSize, 1, resultRedLine, xSize, 1, GDT_Byte, 0, 0 ) != CE_None )
{
QgsDebugMsg( "Raster IO Error" );
}
if ( GDALRasterIO( outputGreenBand, GF_Write, 0, i, xSize, 1, resultGreenLine, xSize, 1, GDT_Byte, 0, 0 ) != CE_None )
{
QgsDebugMsg( "Raster IO Error" );
}
if ( GDALRasterIO( outputBlueBand, GF_Write, 0, i, xSize, 1, resultBlueLine, xSize, 1, GDT_Byte, 0, 0 ) != CE_None )
{
QgsDebugMsg( "Raster IO Error" );
}
}
if ( feedback )
{
feedback->setProgress( 100 );
}
CPLFree( resultRedLine );
CPLFree( resultBlueLine );
CPLFree( resultGreenLine );
CPLFree( scanLine1 );
CPLFree( scanLine2 );
CPLFree( scanLine3 );
GDALClose( inputDataset );
if ( feedback && feedback->isCanceled() )
{
//delete the dataset without closing (because it is faster)
GDALDeleteDataset( outputDriver, mOutputFile.toUtf8().constData() );
return 7;
}
GDALClose( outputDataset );
return 0;
}
int QgsNineCellFilter::processRaster( QProgressDialog* p )
{
GDALAllRegister();
//open input file
int xSize, ySize;
GDALDatasetH inputDataset = openInputFile( xSize, ySize );
if ( inputDataset == NULL )
{
return 1; //opening of input file failed
}
//output driver
GDALDriverH outputDriver = openOutputDriver();
if ( outputDriver == 0 )
{
return 2;
}
GDALDatasetH outputDataset = openOutputFile( inputDataset, outputDriver );
if ( outputDataset == NULL )
{
return 3; //create operation on output file failed
}
//open first raster band for reading (operation is only for single band raster)
GDALRasterBandH rasterBand = GDALGetRasterBand( inputDataset, 1 );
if ( rasterBand == NULL )
{
GDALClose( inputDataset );
GDALClose( outputDataset );
return 4;
}
mInputNodataValue = GDALGetRasterNoDataValue( rasterBand, NULL );
GDALRasterBandH outputRasterBand = GDALGetRasterBand( outputDataset, 1 );
if ( outputRasterBand == NULL )
{
GDALClose( inputDataset );
GDALClose( outputDataset );
return 5;
}
//try to set -9999 as nodata value
GDALSetRasterNoDataValue( outputRasterBand, -9999 );
mOutputNodataValue = GDALGetRasterNoDataValue( outputRasterBand, NULL );
if ( ySize < 3 ) //we require at least three rows (should be true for most datasets)
{
GDALClose( inputDataset );
GDALClose( outputDataset );
return 6;
}
//keep only three scanlines in memory at a time
float* scanLine1 = ( float * ) CPLMalloc( sizeof( float ) * xSize );
float* scanLine2 = ( float * ) CPLMalloc( sizeof( float ) * xSize );
float* scanLine3 = ( float * ) CPLMalloc( sizeof( float ) * xSize );
float* resultLine = ( float * ) CPLMalloc( sizeof( float ) * xSize );
if ( p )
{
p->setMaximum( ySize );
}
//values outside the layer extent (if the 3x3 window is on the border) are sent to the processing method as (input) nodata values
for ( int i = 0; i < ySize; ++i )
{
if ( p )
{
p->setValue( i );
}
if ( p && p->wasCanceled() )
{
break;
}
if ( i == 0 )
{
//fill scanline 1 with (input) nodata for the values above the first row and feed scanline2 with the first row
for ( int a = 0; a < xSize; ++a )
{
scanLine1[a] = mInputNodataValue;
}
GDALRasterIO( rasterBand, GF_Read, 0, 0, xSize, 1, scanLine2, xSize, 1, GDT_Float32, 0, 0 );
}
else
{
//normally fetch only scanLine3 and release scanline 1 if we move forward one row
CPLFree( scanLine1 );
scanLine1 = scanLine2;
scanLine2 = scanLine3;
scanLine3 = ( float * ) CPLMalloc( sizeof( float ) * xSize );
}
if ( i == ySize - 1 ) //fill the row below the bottom with nodata values
{
for ( int a = 0; a < xSize; ++a )
{
scanLine3[a] = mInputNodataValue;
}
}
else
{
GDALRasterIO( rasterBand, GF_Read, 0, i + 1, xSize, 1, scanLine3, xSize, 1, GDT_Float32, 0, 0 );
}
for ( int j = 0; j < xSize; ++j )
{
if ( j == 0 )
{
resultLine[j] = processNineCellWindow( &mInputNodataValue, &scanLine1[j], &scanLine1[j+1], &mInputNodataValue, &scanLine2[j], \
&scanLine2[j+1], &mInputNodataValue, &scanLine3[j], &scanLine3[j+1] );
}
else if ( j == xSize - 1 )
{
resultLine[j] = processNineCellWindow( &scanLine1[j-1], &scanLine1[j], &mInputNodataValue, &scanLine2[j-1], &scanLine2[j], \
&mInputNodataValue, &scanLine3[j-1], &scanLine3[j], &mInputNodataValue );
}
else
{
resultLine[j] = processNineCellWindow( &scanLine1[j-1], &scanLine1[j], &scanLine1[j+1], &scanLine2[j-1], &scanLine2[j], \
&scanLine2[j+1], &scanLine3[j-1], &scanLine3[j], &scanLine3[j+1] );
}
}
GDALRasterIO( outputRasterBand, GF_Write, 0, i, xSize, 1, resultLine, xSize, 1, GDT_Float32, 0, 0 );
}
if ( p )
{
p->setValue( ySize );
}
CPLFree( resultLine );
CPLFree( scanLine1 );
CPLFree( scanLine2 );
CPLFree( scanLine3 );
GDALClose( inputDataset );
if ( p && p->wasCanceled() )
{
//delete the dataset without closing (because it is faster)
GDALDeleteDataset( outputDriver, mOutputFile.toLocal8Bit().data() );
return 7;
}
GDALClose( outputDataset );
return 0;
}
