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qgsgdalprovider.cpp
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qgsgdalprovider.cpp
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/***************************************************************************
qgsgdalprovider.cpp - QGIS Data provider for
GDAL rasters
-------------------
begin : November, 2010
copyright : (C) 2010 by Radim Blazek
email : radim dot blazek at gmail dot com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsgdalprovider.h"
///@cond PRIVATE
#include "qgslogger.h"
#include "qgsgdalproviderbase.h"
#include "qgsgdalprovider.h"
#include "qgsconfig.h"
#include "qgsgdalutils.h"
#include "qgsapplication.h"
#include "qgsauthmanager.h"
#include "qgscoordinatetransform.h"
#include "qgsdataitemprovider.h"
#include "qgsdatasourceuri.h"
#include "qgshtmlutils.h"
#include "qgsmessagelog.h"
#include "qgsrectangle.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsrasterbandstats.h"
#include "qgsrasteridentifyresult.h"
#include "qgsrasterlayer.h"
#include "qgsrasterpyramid.h"
#include "qgspointxy.h"
#include "qgssettings.h"
#include "qgsogrutils.h"
#include "qgsruntimeprofiler.h"
#include "qgszipitem.h"
#include "qgsprovidersublayerdetails.h"
#include "qgsproviderutils.h"
#include <QImage>
#include <QColor>
#include <QProcess>
#include <QDir>
#include <QFileInfo>
#include <QFile>
#include <QHash>
#include <QTime>
#include <QTextDocument>
#include <QDebug>
#include <QRegularExpression>
#include <gdalwarper.h>
#include <gdal.h>
#include <ogr_srs_api.h>
#include <cpl_conv.h>
#include <cpl_string.h>
#define ERRMSG(message) QGS_ERROR_MESSAGE(message,"GDAL provider")
#define ERR(message) QgsError(message,"GDAL provider")
#define PROVIDER_KEY QStringLiteral( "gdal" )
#define PROVIDER_DESCRIPTION QStringLiteral( "GDAL data provider" )
// To avoid potential races when destroying related instances ("main" and clones)
#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
Q_GLOBAL_STATIC_WITH_ARGS( QMutex, sGdalProviderMutex, ( QMutex::Recursive ) )
#else
Q_GLOBAL_STATIC( QRecursiveMutex, sGdalProviderMutex )
#endif
QHash< QgsGdalProvider *, QVector<QgsGdalProvider::DatasetPair> > QgsGdalProvider::mgDatasetCache;
int QgsGdalProvider::mgDatasetCacheSize = 0;
// Number of cached datasets from which we will try to do eviction when a
// provider has 2 or more cached datasets
const int MIN_THRESHOLD_FOR_CACHE_CLEANUP = 10;
// Maximum number of cached datasets
// We try to keep at least 1 cached dataset per parent provider between
// MIN_THRESHOLD_FOR_CACHE_CLEANUP and MAX_CACHE_SIZE. But we don't want to
// maintain more than MAX_CACHE_SIZE datasets opened to avoid running short of
// file descriptors.
const int MAX_CACHE_SIZE = 50;
struct QgsGdalProgress
{
int type;
QgsGdalProvider *provider = nullptr;
QgsRasterBlockFeedback *feedback = nullptr;
};
//
// global callback function
//
int CPL_STDCALL progressCallback( double dfComplete,
const char *pszMessage,
void *pProgressArg )
{
Q_UNUSED( pszMessage )
static double sDfLastComplete = -1.0;
QgsGdalProgress *prog = static_cast<QgsGdalProgress *>( pProgressArg );
if ( sDfLastComplete > dfComplete )
{
if ( sDfLastComplete >= 1.0 )
sDfLastComplete = -1.0;
else
sDfLastComplete = dfComplete;
}
if ( std::floor( sDfLastComplete * 10 ) != std::floor( dfComplete * 10 ) )
{
if ( prog->feedback )
prog->feedback->setProgress( dfComplete * 100 );
}
sDfLastComplete = dfComplete;
if ( prog->feedback && prog->feedback->isCanceled() )
return false;
return true;
}
QgsGdalProvider::QgsGdalProvider( const QString &uri, const QgsError &error )
: QgsRasterDataProvider( uri, QgsDataProvider::ProviderOptions() )
, mpRefCounter( new QAtomicInt( 1 ) )
, mpLightRefCounter( new QAtomicInt( 1 ) )
, mUpdate( false )
{
mGeoTransform[0] = 0;
mGeoTransform[1] = 1;
mGeoTransform[2] = 0;
mGeoTransform[3] = 0;
mGeoTransform[4] = 0;
mGeoTransform[5] = -1;
setError( error );
}
QgsGdalProvider::QgsGdalProvider( const QString &uri, const ProviderOptions &options, bool update, GDALDatasetH dataset )
: QgsRasterDataProvider( uri, options )
, mpRefCounter( new QAtomicInt( 1 ) )
#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
, mpMutex( new QMutex( QMutex::Recursive ) )
#else
, mpMutex( new QRecursiveMutex() )
#endif
, mpParent( new QgsGdalProvider * ( this ) )
, mpLightRefCounter( new QAtomicInt( 1 ) )
, mUpdate( update )
{
mGeoTransform[0] = 0;
mGeoTransform[1] = 1;
mGeoTransform[2] = 0;
mGeoTransform[3] = 0;
mGeoTransform[4] = 0;
mGeoTransform[5] = -1;
QgsDebugMsgLevel( "constructing with uri '" + uri + "'.", 2 );
QgsGdalProviderBase::registerGdalDrivers();
#ifndef QT_NO_NETWORKPROXY
QgsGdalUtils::setupProxy();
#endif
std::unique_ptr< QgsScopedRuntimeProfile > profile;
if ( QgsApplication::profiler()->groupIsActive( QStringLiteral( "projectload" ) ) )
profile = std::make_unique< QgsScopedRuntimeProfile >( tr( "Open data source" ), QStringLiteral( "projectload" ) );
if ( !CPLGetConfigOption( "AAIGRID_DATATYPE", nullptr ) )
{
// GDAL tends to open AAIGrid as Float32 which results in lost precision
// and confusing values shown to users, force Float64
CPLSetConfigOption( "AAIGRID_DATATYPE", "Float64" );
}
// To get buildSupportedRasterFileFilter the provider is called with empty uri
if ( uri.isEmpty() )
{
return;
}
mGdalDataset = nullptr;
if ( dataset )
{
mGdalBaseDataset = dataset;
initBaseDataset();
}
else
{
( void )initIfNeeded();
}
}
QgsGdalProvider::QgsGdalProvider( const QgsGdalProvider &other )
: QgsRasterDataProvider( other.dataSourceUri(), QgsDataProvider::ProviderOptions() )
, mUpdate( false )
{
mDriverName = other.mDriverName;
// The JP2OPENJPEG driver might consume too much memory on large datasets
// so make sure to really use a single one.
// The PostGISRaster driver internally uses a per-thread connection cache.
// This can lead to crashes if two datasets created by the same thread are used at the same time.
bool forceUseSameDataset = ( mDriverName.toUpper() == QLatin1String( "JP2OPENJPEG" ) ||
mDriverName == QLatin1String( "PostGISRaster" ) ||
CSLTestBoolean( CPLGetConfigOption( "QGIS_GDAL_FORCE_USE_SAME_DATASET", "FALSE" ) ) );
if ( forceUseSameDataset )
{
++ ( *other.mpRefCounter );
// cppcheck-suppress copyCtorPointerCopying
mpRefCounter = other.mpRefCounter;
mpMutex = other.mpMutex;
mpLightRefCounter = new QAtomicInt( 1 );
mHasInit = other.mHasInit;
mValid = other.mValid;
mGdalBaseDataset = other.mGdalBaseDataset;
mGdalDataset = other.mGdalDataset;
}
else
{
++ ( *other.mpLightRefCounter );
mpRefCounter = new QAtomicInt( 1 );
mpLightRefCounter = other.mpLightRefCounter;
#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
mpMutex = new QMutex( QMutex::Recursive );
#else
mpMutex = new QRecursiveMutex();
#endif
mpParent = other.mpParent;
if ( getCachedGdalHandles( const_cast<QgsGdalProvider *>( &other ), mGdalBaseDataset, mGdalDataset ) )
{
QgsDebugMsgLevel( QStringLiteral( "recycling already opened dataset" ), 5 );
mHasInit = true;
mValid = other.mValid;
}
else
{
QgsDebugMsgLevel( QStringLiteral( "will need to open new dataset" ), 5 );
mHasInit = false;
mValid = false;
}
}
mHasPyramids = other.mHasPyramids;
mGdalDataType = other.mGdalDataType;
mExtent = other.mExtent;
mWidth = other.mWidth;
mHeight = other.mHeight;
mXBlockSize = other.mXBlockSize;
mYBlockSize = other.mYBlockSize;
memcpy( mGeoTransform, other.mGeoTransform, sizeof( mGeoTransform ) );
mCrs = other.mCrs;
mPyramidList = other.mPyramidList;
mSubLayers = other.mSubLayers;
mMaskBandExposedAsAlpha = other.mMaskBandExposedAsAlpha;
mBandCount = other.mBandCount;
copyBaseSettings( other );
}
QString QgsGdalProvider::dataSourceUri( bool expandAuthConfig ) const
{
if ( expandAuthConfig && QgsDataProvider::dataSourceUri( ).contains( QLatin1String( "authcfg" ) ) )
{
return QgsGdalProvider::expandAuthConfig( QgsDataProvider::dataSourceUri() );
}
else
{
return QgsDataProvider::dataSourceUri();
}
}
QString QgsGdalProvider::expandAuthConfig( const QString &dsName )
{
QString uri( dsName );
// Check for authcfg
QRegularExpression authcfgRe( " authcfg='([^']+)'" );
QRegularExpressionMatch match;
if ( uri.contains( authcfgRe, &match ) )
{
uri = uri.replace( match.captured( 0 ), QString() );
QString configId( match.captured( 1 ) );
QStringList connectionItems;
connectionItems << uri;
if ( QgsApplication::authManager()->updateDataSourceUriItems( connectionItems, configId, QStringLiteral( "ogr" ) ) )
{
uri = connectionItems.first( );
}
}
return uri;
}
QgsGdalProvider *QgsGdalProvider::clone() const
{
return new QgsGdalProvider( *this );
}
bool QgsGdalProvider::getCachedGdalHandles( QgsGdalProvider *provider,
GDALDatasetH &gdalBaseDataset,
GDALDatasetH &gdalDataset )
{
QMutexLocker locker( sGdalProviderMutex() );
auto iter = mgDatasetCache.find( provider );
if ( iter == mgDatasetCache.end() )
{
return false;
}
if ( !iter.value().isEmpty() )
{
DatasetPair pair = iter.value().takeFirst();
mgDatasetCacheSize --;
gdalBaseDataset = pair.mGdalBaseDataset;
gdalDataset = pair.mGdalDataset;
return true;
}
return false;
}
bool QgsGdalProvider::cacheGdalHandlesForLaterReuse( QgsGdalProvider *provider,
GDALDatasetH gdalBaseDataset,
GDALDatasetH gdalDataset )
{
QMutexLocker locker( sGdalProviderMutex() );
// If the cache size goes above the soft limit, try to do evict a cached
// dataset for the provider that has the most cached entries
if ( mgDatasetCacheSize >= MIN_THRESHOLD_FOR_CACHE_CLEANUP )
{
auto iter = mgDatasetCache.find( provider );
if ( iter == mgDatasetCache.end() || iter.value().isEmpty() )
{
QgsGdalProvider *candidateProvider = nullptr;
int nLargestCountOfCachedDatasets = 0;
for ( iter = mgDatasetCache.begin(); iter != mgDatasetCache.end(); ++iter )
{
if ( iter.value().size() > nLargestCountOfCachedDatasets )
{
candidateProvider = iter.key();
nLargestCountOfCachedDatasets = iter.value().size();
}
}
Q_ASSERT( candidateProvider );
Q_ASSERT( !mgDatasetCache[ candidateProvider ].isEmpty() );
// If the candidate is ourselves, then do nothing
if ( candidateProvider == provider )
return false;
// If the candidate provider has at least 2 cached datasets, then
// we can evict one.
// In the case where providers have at most one cached dataset, then
// evict one arbitrarily
if ( nLargestCountOfCachedDatasets >= 2 ||
mgDatasetCacheSize >= MAX_CACHE_SIZE )
{
mgDatasetCacheSize --;
DatasetPair pair = mgDatasetCache[ candidateProvider ].takeLast();
if ( pair.mGdalBaseDataset != pair.mGdalDataset )
{
GDALDereferenceDataset( pair.mGdalBaseDataset );
}
if ( pair.mGdalDataset )
{
GDALClose( pair.mGdalDataset );
}
}
}
else
{
return false;
}
}
// Add handles to the cache
auto iter = mgDatasetCache.find( provider );
if ( iter == mgDatasetCache.end() )
{
mgDatasetCache[provider] = QVector<DatasetPair>();
iter = mgDatasetCache.find( provider );
}
mgDatasetCacheSize ++;
DatasetPair pair;
pair.mGdalBaseDataset = gdalBaseDataset;
pair.mGdalDataset = gdalDataset;
iter.value().push_back( pair );
return true;
}
void QgsGdalProvider::closeCachedGdalHandlesFor( QgsGdalProvider *provider )
{
QMutexLocker locker( sGdalProviderMutex() );
auto iter = mgDatasetCache.find( provider );
if ( iter != mgDatasetCache.end() )
{
while ( !iter.value().isEmpty() )
{
mgDatasetCacheSize --;
DatasetPair pair = iter.value().takeLast();
if ( pair.mGdalBaseDataset != pair.mGdalDataset )
{
GDALDereferenceDataset( pair.mGdalBaseDataset );
}
if ( pair.mGdalDataset )
{
GDALClose( pair.mGdalDataset );
}
}
mgDatasetCache.erase( iter );
}
}
QgsGdalProvider::~QgsGdalProvider()
{
QMutexLocker locker( sGdalProviderMutex() );
if ( mGdalTransformerArg )
GDALDestroyTransformer( mGdalTransformerArg );
int lightRefCounter = -- ( *mpLightRefCounter );
int refCounter = -- ( *mpRefCounter );
if ( refCounter == 0 )
{
if ( mpParent && *mpParent && *mpParent != this && mGdalBaseDataset &&
cacheGdalHandlesForLaterReuse( *mpParent, mGdalBaseDataset, mGdalDataset ) )
{
// do nothing
}
else
{
if ( mGdalBaseDataset != mGdalDataset )
{
GDALDereferenceDataset( mGdalBaseDataset );
}
if ( mGdalDataset )
{
// Check if already a PAM (persistent auxiliary metadata) file exists
QString pamFile = dataSourceUri( true ) + QLatin1String( ".aux.xml" );
bool pamFileAlreadyExists = QFileInfo::exists( pamFile );
GDALClose( mGdalDataset );
// If GDAL created a PAM file right now by using estimated metadata, delete it right away
if ( !mStatisticsAreReliable && !pamFileAlreadyExists && QFileInfo::exists( pamFile ) )
QFile( pamFile ).remove();
}
if ( mpParent && *mpParent == this )
{
*mpParent = nullptr;
closeCachedGdalHandlesFor( this );
}
}
delete mpMutex;
delete mpRefCounter;
if ( lightRefCounter == 0 )
{
delete mpLightRefCounter;
delete mpParent;
}
}
}
void QgsGdalProvider::closeDataset()
{
if ( !mValid )
{
return;
}
mValid = false;
if ( mGdalBaseDataset != mGdalDataset )
{
GDALDereferenceDataset( mGdalBaseDataset );
}
mGdalBaseDataset = nullptr;
GDALClose( mGdalDataset );
mGdalDataset = nullptr;
closeCachedGdalHandlesFor( this );
}
void QgsGdalProvider::reloadProviderData()
{
QMutexLocker locker( mpMutex );
closeDataset();
mHasInit = false;
( void )initIfNeeded();
}
QString QgsGdalProvider::htmlMetadata()
{
QMutexLocker locker( mpMutex );
if ( !initIfNeeded() )
return QString();
GDALDriverH hDriver = GDALGetDriverByName( mDriverName.toLocal8Bit().constData() );
if ( !hDriver )
return QString();
QString myMetadata;
// GDAL Driver description
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) + tr( "GDAL Driver Description" ) + QStringLiteral( "</td><td>" ) + mDriverName + QStringLiteral( "</td></tr>\n" );
// GDAL Driver Metadata
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) + tr( "GDAL Driver Metadata" ) + QStringLiteral( "</td><td>" ) + QString( GDALGetMetadataItem( hDriver, GDAL_DMD_LONGNAME, nullptr ) ) + QStringLiteral( "</td></tr>\n" );
// Dataset description
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) + tr( "Dataset Description" ) + QStringLiteral( "</td><td>" ) + QString::fromUtf8( GDALGetDescription( mGdalDataset ) ) + QStringLiteral( "</td></tr>\n" );
// compression
QString compression = QString( GDALGetMetadataItem( mGdalDataset, "COMPRESSION", "IMAGE_STRUCTURE" ) );
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) + tr( "Compression" ) + QStringLiteral( "</td><td>" ) + compression + QStringLiteral( "</td></tr>\n" );
// Band details
for ( int i = 1; i <= GDALGetRasterCount( mGdalDataset ); ++i )
{
GDALRasterBandH gdalBand = GDALGetRasterBand( mGdalDataset, i );
char **GDALmetadata = GDALGetMetadata( gdalBand, nullptr );
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) + tr( "Band %1" ).arg( i ) + QStringLiteral( "</td><td>" );
if ( GDALmetadata )
{
QStringList metadata = QgsOgrUtils::cStringListToQStringList( GDALmetadata );
myMetadata += QgsHtmlUtils::buildBulletList( metadata );
}
char **GDALcategories = GDALGetRasterCategoryNames( gdalBand );
if ( GDALcategories )
{
QStringList categories = QgsOgrUtils::cStringListToQStringList( GDALcategories );
myMetadata += QgsHtmlUtils::buildBulletList( categories );
}
myMetadata += QLatin1String( "</td></tr>" );
}
// More information
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) + tr( "More information" ) + QStringLiteral( "</td><td>\n" );
if ( mMaskBandExposedAsAlpha )
{
myMetadata += tr( "Mask band (exposed as alpha band)" ) + QStringLiteral( "<br />\n" );
}
char **GDALmetadata = GDALGetMetadata( mGdalDataset, nullptr );
if ( GDALmetadata )
{
QStringList metadata = QgsOgrUtils::cStringListToQStringList( GDALmetadata );
myMetadata += QgsHtmlUtils::buildBulletList( metadata );
}
//just use the first band
if ( GDALGetRasterCount( mGdalDataset ) > 0 )
{
GDALRasterBandH myGdalBand = GDALGetRasterBand( mGdalDataset, 1 );
if ( GDALGetOverviewCount( myGdalBand ) > 0 )
{
int myOverviewInt;
for ( myOverviewInt = 0; myOverviewInt < GDALGetOverviewCount( myGdalBand ); myOverviewInt++ )
{
GDALRasterBandH myOverview;
myOverview = GDALGetOverview( myGdalBand, myOverviewInt );
QStringList metadata;
metadata.append( QStringLiteral( "X : " ) + QString::number( GDALGetRasterBandXSize( myOverview ) ) );
metadata.append( QStringLiteral( "Y : " ) + QString::number( GDALGetRasterBandYSize( myOverview ) ) );
myMetadata += QgsHtmlUtils::buildBulletList( metadata );
}
}
}
// End more information
myMetadata += QLatin1String( "</td></tr>\n" );
// Dimensions
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) + tr( "Dimensions" ) + QStringLiteral( "</td><td>" );
myMetadata += tr( "X: %1 Y: %2 Bands: %3" )
.arg( GDALGetRasterXSize( mGdalDataset ) )
.arg( GDALGetRasterYSize( mGdalDataset ) )
.arg( GDALGetRasterCount( mGdalDataset ) );
myMetadata += QLatin1String( "</td></tr>\n" );
if ( GDALGetGeoTransform( mGdalDataset, mGeoTransform ) != CE_None )
{
// if the raster does not have a valid transform we need to use
// a pixel size of (1,-1), but GDAL returns (1,1)
mGeoTransform[5] = -1;
}
else
{
// Origin
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) + tr( "Origin" ) + QStringLiteral( "</td><td>" ) + QString::number( mGeoTransform[0] ) + QStringLiteral( "," ) + QString::number( mGeoTransform[3] ) + QStringLiteral( "</td></tr>\n" );
// Pixel size
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) + tr( "Pixel Size" ) + QStringLiteral( "</td><td>" ) + QString::number( mGeoTransform[1], 'g', 19 ) + QStringLiteral( "," ) + QString::number( mGeoTransform[5], 'g', 19 ) + QStringLiteral( "</td></tr>\n" );
}
return myMetadata;
}
QgsRasterBlock *QgsGdalProvider::block( int bandNo, const QgsRectangle &extent, int width, int height, QgsRasterBlockFeedback *feedback )
{
std::unique_ptr< QgsRasterBlock > block = std::make_unique< QgsRasterBlock >( dataType( bandNo ), width, height );
if ( !initIfNeeded() )
return block.release();
if ( sourceHasNoDataValue( bandNo ) && useSourceNoDataValue( bandNo ) )
{
block->setNoDataValue( sourceNoDataValue( bandNo ) );
}
if ( block->isEmpty() )
{
return block.release();
}
if ( !mExtent.intersects( extent ) )
{
// the requested extent is completely outside of the raster's extent - nothing to do
block->setIsNoData();
return block.release();
}
if ( !mExtent.contains( extent ) )
{
QRect subRect = QgsRasterBlock::subRect( extent, width, height, mExtent );
block->setIsNoDataExcept( subRect );
}
if ( !readBlock( bandNo, extent, width, height, block->bits(), feedback ) )
{
block->setError( { tr( "Error occurred while reading block." ), QStringLiteral( "GDAL" ) } );
block->setIsNoData();
block->setValid( false );
return block.release();
}
// apply scale and offset
Q_ASSERT( block ); // to make cppcheck happy
block->applyScaleOffset( bandScale( bandNo ), bandOffset( bandNo ) );
block->applyNoDataValues( userNoDataValues( bandNo ) );
return block.release();
}
bool QgsGdalProvider::readBlock( int bandNo, int xBlock, int yBlock, void *data )
{
QMutexLocker locker( mpMutex );
if ( !initIfNeeded() )
return false;
// TODO!!!: Check data alignment!!! May it happen that nearest value which
// is not nearest is assigned to an output cell???
GDALRasterBandH myGdalBand = getBand( bandNo );
//GDALReadBlock( myGdalBand, xBlock, yBlock, block );
// We have to read with correct data type consistent with other readBlock functions
int xOff = xBlock * mXBlockSize;
int yOff = yBlock * mYBlockSize;
CPLErr err = gdalRasterIO( myGdalBand, GF_Read, xOff, yOff, mXBlockSize, mYBlockSize, data, mXBlockSize, mYBlockSize, ( GDALDataType ) mGdalDataType.at( bandNo - 1 ), 0, 0 );
if ( err != CPLE_None )
{
QgsLogger::warning( "RasterIO error: " + QString::fromUtf8( CPLGetLastErrorMsg() ) );
return false;
}
return true;
}
bool QgsGdalProvider::canDoResampling(
int bandNo,
const QgsRectangle &reqExtent,
int bufferWidthPix,
int bufferHeightPix )
{
QMutexLocker locker( mpMutex );
if ( !initIfNeeded() )
return false;
GDALRasterBandH gdalBand = getBand( bandNo );
if ( GDALGetRasterColorTable( gdalBand ) )
return false;
const double reqXRes = reqExtent.width() / bufferWidthPix;
const double reqYRes = reqExtent.height() / bufferHeightPix;
const double srcXRes = mGeoTransform[1];
const double srcYRes = fabs( mGeoTransform[5] );
// Compute the resampling factor :
// < 1 means upsampling / zoom-in
// > 1 means downsampling / zoom-out
const double resamplingFactor = std::max( reqXRes / srcXRes, reqYRes / srcYRes );
if ( resamplingFactor < 1 )
{
// upsampling
return mZoomedInResamplingMethod != QgsRasterDataProvider::ResamplingMethod::Nearest;
}
if ( resamplingFactor < 1.1 )
{
// very close to nominal resolution ==> check compatibility of zoom-in or zoom-out resampler with what GDAL can do
return mZoomedInResamplingMethod != QgsRasterDataProvider::ResamplingMethod::Nearest ||
mZoomedOutResamplingMethod != QgsRasterDataProvider::ResamplingMethod::Nearest;
}
// if no zoom out resampling, exit now
if ( mZoomedOutResamplingMethod == QgsRasterDataProvider::ResamplingMethod::Nearest )
{
return false;
}
// if the resampling factor is not too large, we can do the downsampling
// from the full resolution with acceptable performance
if ( resamplingFactor <= ( mMaxOversampling + .1 ) )
{
return true;
}
// otherwise, we have to check that we have an overview band that satisfies
// that criterion
const int nOvrCount = GDALGetOverviewCount( gdalBand );
for ( int i = 0; i < nOvrCount; i++ )
{
GDALRasterBandH hOvrBand = GDALGetOverview( gdalBand, i );
const double ovrResamplingFactor = xSize() / static_cast<double>( GDALGetRasterBandXSize( hOvrBand ) );
if ( resamplingFactor <= ( mMaxOversampling + .1 ) * ovrResamplingFactor )
{
return true;
}
}
// too much zoomed out
return false;
}
static GDALRIOResampleAlg getGDALResamplingAlg( QgsGdalProvider::ResamplingMethod method )
{
GDALRIOResampleAlg eResampleAlg = GRIORA_NearestNeighbour;
switch ( method )
{
case QgsGdalProvider::ResamplingMethod::Nearest:
eResampleAlg = GRIORA_NearestNeighbour;
break;
case QgsGdalProvider::ResamplingMethod::Bilinear:
eResampleAlg = GRIORA_Bilinear;
break;
case QgsGdalProvider::ResamplingMethod::Cubic:
eResampleAlg = GRIORA_Cubic;
break;
case QgsRasterDataProvider::ResamplingMethod::CubicSpline:
eResampleAlg = GRIORA_CubicSpline;
break;
case QgsRasterDataProvider::ResamplingMethod::Lanczos:
eResampleAlg = GRIORA_Lanczos;
break;
case QgsRasterDataProvider::ResamplingMethod::Average:
eResampleAlg = GRIORA_Average;
break;
case QgsRasterDataProvider::ResamplingMethod::Mode:
eResampleAlg = GRIORA_Mode;
break;
case QgsRasterDataProvider::ResamplingMethod::Gauss:
eResampleAlg = GRIORA_Gauss;
break;
}
return eResampleAlg;
}
bool QgsGdalProvider::readBlock( int bandNo, QgsRectangle const &reqExtent, int bufferWidthPix, int bufferHeightPix, void *data, QgsRasterBlockFeedback *feedback )
{
QMutexLocker locker( mpMutex );
if ( !initIfNeeded() )
return false;
QgsDebugMsgLevel( "bufferWidthPix = " + QString::number( bufferWidthPix ), 5 );
QgsDebugMsgLevel( "bufferHeightPix = " + QString::number( bufferHeightPix ), 5 );
QgsDebugMsgLevel( "reqExtent: " + reqExtent.toString(), 5 );
for ( int i = 0; i < 6; i++ )
{
QgsDebugMsgLevel( QStringLiteral( "transform : %1" ).arg( mGeoTransform[i] ), 5 );
}
const size_t dataSize = static_cast<size_t>( dataTypeSize( bandNo ) );
QgsRectangle intersectExtent = reqExtent.intersect( mExtent );
if ( intersectExtent.isEmpty() )
{
QgsDebugMsgLevel( QStringLiteral( "draw request outside view extent." ), 2 );
return false;
}
QgsDebugMsgLevel( "extent: " + mExtent.toString(), 5 );
QgsDebugMsgLevel( "intersectExtent: " + intersectExtent.toString(), 5 );
const double reqXRes = reqExtent.width() / bufferWidthPix;
const double reqYRes = reqExtent.height() / bufferHeightPix;
const double srcXRes = mGeoTransform[1];
const double srcYRes = mGeoTransform[5]; // may be negative?
QgsDebugMsgLevel( QStringLiteral( "reqXRes = %1 reqYRes = %2 srcXRes = %3 srcYRes = %4" ).arg( reqXRes ).arg( reqYRes ).arg( srcXRes ).arg( srcYRes ), 5 );
const double resamplingFactor = std::max( reqXRes / srcXRes, reqYRes / srcYRes );
GDALRasterBandH gdalBand = getBand( bandNo );
const GDALDataType type = static_cast<GDALDataType>( mGdalDataType.at( bandNo - 1 ) );
// Find top, bottom rows and left, right column the raster extent covers
// These are limits in target grid space
QRect subRect = QgsRasterBlock::subRect( reqExtent, bufferWidthPix, bufferHeightPix, intersectExtent );
const int tgtTopOri = subRect.top();
const int tgtBottomOri = subRect.bottom();
const int tgtLeftOri = subRect.left();
const int tgtRightOri = subRect.right();
// Calculate rows/cols limits in source raster grid space
int srcLeft = 0;
int srcTop = 0;
int srcBottom = ySize() - 1;
int srcRight = xSize() - 1;
// Get necessary src extent aligned to src resolution
if ( mExtent.xMinimum() < intersectExtent.xMinimum() )
{
srcLeft = static_cast<int>( std::floor( ( intersectExtent.xMinimum() - mExtent.xMinimum() ) / srcXRes ) );
}
if ( mExtent.xMaximum() > intersectExtent.xMaximum() )
{
// Clamp to raster width to avoid potential rounding errors (see GH #34435)
srcRight = std::min( mWidth - 1, static_cast<int>( std::floor( ( intersectExtent.xMaximum() - mExtent.xMinimum() ) / srcXRes ) ) );
}
// GDAL states that mGeoTransform[3] is top, may it also be bottom and mGeoTransform[5] positive?
if ( mExtent.yMaximum() > intersectExtent.yMaximum() )
{
srcTop = static_cast<int>( std::floor( -1. * ( mExtent.yMaximum() - intersectExtent.yMaximum() ) / srcYRes ) );
}
if ( mExtent.yMinimum() < intersectExtent.yMinimum() )
{
// Clamp to raster height to avoid potential rounding errors (see GH #34435)
srcBottom = std::min( mHeight - 1, static_cast<int>( std::floor( -1. * ( mExtent.yMaximum() - intersectExtent.yMinimum() ) / srcYRes ) ) );
}
const int srcWidth = srcRight - srcLeft + 1;
const int srcHeight = srcBottom - srcTop + 1;
// Use GDAL resampling if asked and possible
if ( mProviderResamplingEnabled &&
canDoResampling( bandNo, reqExtent, bufferWidthPix, bufferHeightPix ) )
{
int tgtTop = tgtTopOri;
int tgtBottom = tgtBottomOri;
int tgtLeft = tgtLeftOri;
int tgtRight = tgtRightOri;
// Deal with situations that requires adjusting tgt coordinates.
// This is due rounding in QgsRasterBlock::subRect() and
// when the difference between the raster extent and the
// request extent is less than half of the request resolution.
// This is to avoid to send dfXOff, dfYOff, dfXSize, dfYSize values that
// would be outside of the raster extent, as GDAL (at least currently)
// rejects them
if ( reqExtent.xMinimum() + tgtLeft * reqXRes < mExtent.xMinimum() )
{
if ( GDALRasterIO( gdalBand, GF_Read, 0, srcTop, 1, srcHeight,
static_cast<char *>( data ) + tgtTopOri * bufferWidthPix * dataSize,
1, tgtBottomOri - tgtTopOri + 1, type,
dataSize, dataSize * bufferWidthPix ) != CE_None )
{
return false;
}
tgtLeft ++;
}
if ( reqExtent.yMaximum() - tgtTop * reqYRes > mExtent.yMaximum() )
{
if ( GDALRasterIO( gdalBand, GF_Read, srcLeft, 0, srcWidth, 1,
static_cast<char *>( data ) + tgtLeftOri * dataSize,
tgtRightOri - tgtLeftOri + 1, 1, type,
dataSize, dataSize * bufferWidthPix ) != CE_None )
{
return false;
}
tgtTop ++;
}
if ( reqExtent.xMinimum() + ( tgtRight + 1 ) * reqXRes > mExtent.xMaximum() )
{
if ( GDALRasterIO( gdalBand, GF_Read, xSize() - 1, srcTop, 1, srcHeight,
static_cast<char *>( data ) + ( tgtTopOri * bufferWidthPix + tgtRightOri ) * dataSize,
1, tgtBottomOri - tgtTopOri + 1, type,
dataSize, dataSize * bufferWidthPix ) != CE_None )
{
return false;
}
tgtRight --;
}
if ( reqExtent.yMaximum() - ( tgtBottom + 1 ) * reqYRes < mExtent.yMinimum() )
{
if ( GDALRasterIO( gdalBand, GF_Read, srcLeft, ySize() - 1, srcWidth, 1,
static_cast<char *>( data ) + ( tgtBottomOri * bufferWidthPix + tgtLeftOri ) * dataSize,
tgtRightOri - tgtLeftOri + 1, 1, type,
dataSize, dataSize * bufferWidthPix ) != CE_None )
{
return false;
}
tgtBottom --;
}
int tgtWidth = tgtRight - tgtLeft + 1;
int tgtHeight = tgtBottom - tgtTop + 1;
if ( tgtWidth > 0 && tgtHeight > 0 )
{
QgsDebugMsgLevel( QStringLiteral( "using GDAL resampling path" ), 5 );
GDALRasterIOExtraArg sExtraArg;
INIT_RASTERIO_EXTRA_ARG( sExtraArg );
ResamplingMethod method;
if ( resamplingFactor < 1 )
{
method = mZoomedInResamplingMethod;
}
else if ( resamplingFactor < 1.1 )
{
// very close to nominal resolution ==> use either zoomed out resampler or zoomed in resampler
if ( mZoomedOutResamplingMethod != ResamplingMethod::Nearest )
method = mZoomedOutResamplingMethod;
else
method = mZoomedInResamplingMethod;
}
else
{
method = mZoomedOutResamplingMethod;
}
sExtraArg.eResampleAlg = getGDALResamplingAlg( method );
if ( mMaskBandExposedAsAlpha &&
bandNo == GDALGetRasterCount( mGdalDataset ) + 1 &&
sExtraArg.eResampleAlg != GRIORA_NearestNeighbour &&
sExtraArg.eResampleAlg != GRIORA_Bilinear )
{
// As time of writing in GDAL up to 3.1, there's a difference of behavior
// when using non-nearest resampling on mask bands.
// With bilinear, values are returned in [0,255] range
// whereas with cubic (and other convolution-based methods), there are in [0,1] range.
// As we want [0,255] range, fallback to Bilinear for the mask band
sExtraArg.eResampleAlg = GRIORA_Bilinear;
}
sExtraArg.bFloatingPointWindowValidity = true;
sExtraArg.dfXOff = ( reqExtent.xMinimum() + tgtLeft * reqXRes - mExtent.xMinimum() ) / srcXRes;
sExtraArg.dfYOff = ( mExtent.yMaximum() - ( reqExtent.yMaximum() - tgtTop * reqYRes ) ) / -srcYRes;
sExtraArg.dfXSize = tgtWidth * reqXRes / srcXRes;
sExtraArg.dfYSize = tgtHeight * reqYRes / -srcYRes;
return GDALRasterIOEx( gdalBand, GF_Read,
static_cast<int>( std::floor( sExtraArg.dfXOff ) ),
static_cast<int>( std::floor( sExtraArg.dfYOff ) ),
std::max( 1, static_cast<int>( std::floor( sExtraArg.dfXSize ) ) ),
std::max( 1, static_cast<int>( std::floor( sExtraArg.dfYSize ) ) ),
static_cast<char *>( data ) +
( tgtTop * bufferWidthPix + tgtLeft ) * dataSize,
tgtWidth,
tgtHeight,
type,
dataSize,
dataSize * bufferWidthPix,
&sExtraArg ) == CE_None;
}
}
// Provider resampling was asked but we cannot do it in a performant way
// (too much downsampling compared to the allowed maximum resampling factor),
// so fallback to something replicating QgsRasterResampleFilter behavior
else if ( mProviderResamplingEnabled &&
mZoomedOutResamplingMethod != QgsRasterDataProvider::ResamplingMethod::Nearest &&