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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 "qgslogger.h"
#include "qgsgdalproviderbase.h"
#include "qgsgdalprovider.h"
#include "qgsconfig.h"
#include "qgsapplication.h"
#include "qgscoordinatetransform.h"
#include "qgsdataitem.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"
#ifdef HAVE_GUI
#include "qgssourceselectprovider.h"
#include "qgsgdalsourceselect.h"
#endif
#include <QImage>
#include <QColor>
#include <QProcess>
#include <QMessageBox>
#include <QDir>
#include <QFileInfo>
#include <QFile>
#include <QHash>
#include <QTime>
#include <QTextDocument>
#include <QDebug>
#include <gdalwarper.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")
static QString PROVIDER_KEY = QStringLiteral( "gdal" );
static QString PROVIDER_DESCRIPTION = QStringLiteral( "GDAL provider" );
// To avoid potential races when destroying related instances ("main" and clones)
static QMutex gGdaProviderMutex( QMutex::Recursive );
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 )
, 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, bool update, GDALDatasetH dataset )
: QgsRasterDataProvider( uri )
, mpRefCounter( new QAtomicInt( 1 ) )
, mpMutex( new QMutex( QMutex::Recursive ) )
, 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;
QgsDebugMsg( "constructing with uri '" + uri + "'." );
QgsGdalProviderBase::registerGdalDrivers();
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" );
}
#if !(GDAL_VERSION_MAJOR > 2 || (GDAL_VERSION_MAJOR == 2 && GDAL_VERSION_MINOR >= 3))
if ( !CPLGetConfigOption( "VRT_SHARED_SOURCE", nullptr ) )
{
// GDAL < 2.3 has issues with use of VRT in multi-threaded
// scenarios. See https://issues.qgis.org/issues/16507 /
// https://trac.osgeo.org/gdal/ticket/6939
CPLSetConfigOption( "VRT_SHARED_SOURCE", "NO" );
}
#endif
// 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() )
, mUpdate( false )
{
// The JP2OPENJPEG driver might consume too much memory on large datasets
// so make sure to really use a single one.
bool forceUseSameDataset =
( other.mGdalBaseDataset &&
GDALGetDatasetDriver( other.mGdalBaseDataset ) == GDALGetDriverByName( "JP2OPENJPEG" ) ) ||
CSLTestBoolean( CPLGetConfigOption( "QGIS_GDAL_FORCE_USE_SAME_DATASET", "FALSE" ) );
if ( forceUseSameDataset )
{
++ ( *other.mpRefCounter );
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;
mpMutex = new QMutex( QMutex::Recursive );
mpParent = other.mpParent;
if ( getCachedGdalHandles( const_cast<QgsGdalProvider *>( &other ), mGdalBaseDataset, mGdalDataset ) )
{
QgsDebugMsgLevel( "recycling already opened dataset", 5 );
mHasInit = true;
mValid = other.mValid;
}
else
{
QgsDebugMsgLevel( "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 );
}
QgsGdalProvider *QgsGdalProvider::clone() const
{
return new QgsGdalProvider( *this );
}
bool QgsGdalProvider::crsFromWkt( const char *wkt )
{
OGRSpatialReferenceH hCRS = OSRNewSpatialReference( nullptr );
if ( OSRImportFromWkt( hCRS, ( char ** ) &wkt ) == OGRERR_NONE )
{
if ( OSRAutoIdentifyEPSG( hCRS ) == OGRERR_NONE )
{
QString authid = QStringLiteral( "%1:%2" )
.arg( OSRGetAuthorityName( hCRS, nullptr ),
OSRGetAuthorityCode( hCRS, nullptr ) );
QgsDebugMsg( "authid recognized as " + authid );
mCrs = QgsCoordinateReferenceSystem::fromOgcWmsCrs( authid );
}
else
{
// get the proj4 text
char *pszProj4 = nullptr;
OSRExportToProj4( hCRS, &pszProj4 );
QgsDebugMsg( pszProj4 );
CPLFree( pszProj4 );
char *pszWkt = nullptr;
OSRExportToWkt( hCRS, &pszWkt );
QString myWktString = QString( pszWkt );
CPLFree( pszWkt );
// create CRS from Wkt
mCrs = QgsCoordinateReferenceSystem::fromWkt( myWktString );
}
}
OSRRelease( hCRS );
return mCrs.isValid();
}
bool QgsGdalProvider::getCachedGdalHandles( QgsGdalProvider *provider,
GDALDatasetH &gdalBaseDataset,
GDALDatasetH &gdalDataset )
{
QMutexLocker locker( &gGdaProviderMutex );
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( &gGdaProviderMutex );
// 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 )
{
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( &gGdaProviderMutex );
auto iter = mgDatasetCache.find( provider );
if ( iter != mgDatasetCache.end() )
{
while ( !iter.value().isEmpty() )
{
mgDatasetCacheSize --;
DatasetPair pair = iter.value().takeLast();
if ( pair.mGdalBaseDataset )
{
GDALDereferenceDataset( pair.mGdalBaseDataset );
}
if ( pair.mGdalDataset )
{
GDALClose( pair.mGdalDataset );
}
}
mgDatasetCache.erase( iter );
}
}
QgsGdalProvider::~QgsGdalProvider()
{
QMutexLocker locker( &gGdaProviderMutex );
int lightRefCounter = -- ( *mpLightRefCounter );
int refCounter = -- ( *mpRefCounter );
if ( refCounter == 0 )
{
if ( mpParent && *mpParent && *mpParent != this && mGdalBaseDataset &&
cacheGdalHandlesForLaterReuse( *mpParent, mGdalBaseDataset, mGdalDataset ) )
{
// do nothing
}
else
{
if ( mGdalBaseDataset )
{
GDALDereferenceDataset( mGdalBaseDataset );
}
if ( mGdalDataset )
{
GDALClose( mGdalDataset );
}
if ( mpParent && *mpParent == this )
{
*mpParent = nullptr;
closeCachedGdalHandlesFor( this );
}
}
delete mpMutex;
delete mpRefCounter;
if ( lightRefCounter == 0 )
{
delete mpLightRefCounter;
delete mpParent;
}
}
}
// This was used by raster layer to reload data
void QgsGdalProvider::closeDataset()
{
if ( !mValid )
{
return;
}
mValid = false;
GDALDereferenceDataset( mGdalBaseDataset );
mGdalBaseDataset = nullptr;
GDALClose( mGdalDataset );
mGdalDataset = nullptr;
}
QString QgsGdalProvider::htmlMetadata()
{
QMutexLocker locker( mpMutex );
if ( !initIfNeeded() )
return QString();
QString myMetadata;
// GDAL Driver description
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) + tr( "GDAL Driver Description" ) + QStringLiteral( "</td><td>" ) + QString( GDALGetDescription( GDALGetDatasetDriver( mGdalDataset ) ) ) + QStringLiteral( "</td></tr>\n" );
// GDAL Driver Metadata
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) + tr( "GDAL Driver Metadata" ) + QStringLiteral( "</td><td>" ) + QString( GDALGetMetadataItem( GDALGetDatasetDriver( mGdalDataset ), 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 = cStringList2Q_( GDALmetadata );
myMetadata += QgsHtmlUtils::buildBulletList( metadata );
}
char **GDALcategories = GDALGetRasterCategoryNames( gdalBand );
if ( GDALcategories )
{
QStringList categories = cStringList2Q_( GDALcategories );
myMetadata += QgsHtmlUtils::buildBulletList( categories );
}
myMetadata += QStringLiteral( "</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 = cStringList2Q_( 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 += QStringLiteral( "</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 += QStringLiteral( "</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] ) + QStringLiteral( "," ) + QString::number( mGeoTransform[5] ) + QStringLiteral( "</td></tr>\n" );
}
return myMetadata;
}
QgsRasterBlock *QgsGdalProvider::block( int bandNo, const QgsRectangle &extent, int width, int height, QgsRasterBlockFeedback *feedback )
{
QgsRasterBlock *block = new QgsRasterBlock( dataType( bandNo ), width, height );
if ( !initIfNeeded() )
return block;
if ( sourceHasNoDataValue( bandNo ) && useSourceNoDataValue( bandNo ) )
{
block->setNoDataValue( sourceNoDataValue( bandNo ) );
}
if ( block->isEmpty() )
{
return block;
}
if ( !mExtent.contains( extent ) )
{
QRect subRect = QgsRasterBlock::subRect( extent, width, height, mExtent );
block->setIsNoDataExcept( subRect );
}
readBlock( bandNo, extent, width, height, block->bits(), feedback );
// apply scale and offset
block->applyScaleOffset( bandScale( bandNo ), bandOffset( bandNo ) );
block->applyNoDataValues( userNoDataValues( bandNo ) );
return block;
}
void QgsGdalProvider::readBlock( int bandNo, int xBlock, int yBlock, void *block )
{
QMutexLocker locker( mpMutex );
if ( !initIfNeeded() )
return;
// TODO!!!: Check data alignment!!! May it happen that nearest value which
// is not nearest is assigned to an output cell???
//QgsDebugMsg( "yBlock = " + QString::number( yBlock ) );
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;
gdalRasterIO( myGdalBand, GF_Read, xOff, yOff, mXBlockSize, mYBlockSize, block, mXBlockSize, mYBlockSize, ( GDALDataType ) mGdalDataType.at( bandNo - 1 ), 0, 0 );
}
void QgsGdalProvider::readBlock( int bandNo, QgsRectangle const &extent, int pixelWidth, int pixelHeight, void *block, QgsRasterBlockFeedback *feedback )
{
QMutexLocker locker( mpMutex );
if ( !initIfNeeded() )
return;
QgsDebugMsgLevel( "thePixelWidth = " + QString::number( pixelWidth ), 5 );
QgsDebugMsgLevel( "thePixelHeight = " + QString::number( pixelHeight ), 5 );
QgsDebugMsgLevel( "theExtent: " + extent.toString(), 5 );
for ( int i = 0; i < 6; i++ )
{
QgsDebugMsgLevel( QString( "transform : %1" ).arg( mGeoTransform[i] ), 5 );
}
int dataSize = dataTypeSize( bandNo );
// moved to block()
#if 0
if ( !mExtent.contains( extent ) )
{
// fill with null values
QByteArray ba = QgsRasterBlock::valueBytes( dataType( bandNo ), noDataValue( bandNo ) );
char *nodata = ba.data();
char *block = ( char * ) block;
for ( int i = 0; i < pixelWidth * pixelHeight; i++ )
{
memcpy( block, nodata, dataSize );
block += dataSize;
}
}
#endif
QgsRectangle myRasterExtent = extent.intersect( &mExtent );
if ( myRasterExtent.isEmpty() )
{
QgsDebugMsg( "draw request outside view extent." );
return;
}
QgsDebugMsgLevel( "mExtent: " + mExtent.toString(), 5 );
QgsDebugMsgLevel( "myRasterExtent: " + myRasterExtent.toString(), 5 );
double xRes = extent.width() / pixelWidth;
double yRes = extent.height() / pixelHeight;
// Find top, bottom rows and left, right column the raster extent covers
// These are limits in target grid space
#if 0
int top = 0;
int bottom = pixelHeight - 1;
int left = 0;
int right = pixelWidth - 1;
if ( myRasterExtent.yMaximum() < extent.yMaximum() )
{
top = std::round( ( extent.yMaximum() - myRasterExtent.yMaximum() ) / yRes );
}
if ( myRasterExtent.yMinimum() > extent.yMinimum() )
{
bottom = std::round( ( extent.yMaximum() - myRasterExtent.yMinimum() ) / yRes ) - 1;
}
if ( myRasterExtent.xMinimum() > extent.xMinimum() )
{
left = std::round( ( myRasterExtent.xMinimum() - extent.xMinimum() ) / xRes );
}
if ( myRasterExtent.xMaximum() < extent.xMaximum() )
{
right = std::round( ( myRasterExtent.xMaximum() - extent.xMinimum() ) / xRes ) - 1;
}
#endif
QRect subRect = QgsRasterBlock::subRect( extent, pixelWidth, pixelHeight, myRasterExtent );
int top = subRect.top();
int bottom = subRect.bottom();
int left = subRect.left();
int right = subRect.right();
QgsDebugMsgLevel( QString( "top = %1 bottom = %2 left = %3 right = %4" ).arg( top ).arg( bottom ).arg( left ).arg( right ), 5 );
// We want to avoid another resampling, so we read data approximately with
// the same resolution as requested and exactly the width/height we need.
// Calculate rows/cols limits in raster grid space
// Set readable names
double srcXRes = mGeoTransform[1];
double srcYRes = mGeoTransform[5]; // may be negative?
QgsDebugMsgLevel( QString( "xRes = %1 yRes = %2 srcXRes = %3 srcYRes = %4" ).arg( xRes ).arg( yRes ).arg( srcXRes ).arg( srcYRes ), 5 );
// target size in pizels
int width = right - left + 1;
int height = bottom - top + 1;
int srcLeft = 0; // source raster x offset
int srcTop = 0; // source raster x offset
int srcBottom = ySize() - 1;
int srcRight = xSize() - 1;
// Note: original approach for xRes < srcXRes || yRes < std::fabs( srcYRes ) was to avoid
// second resampling and read with GDALRasterIO to another temporary data block
// extended to fit src grid. The problem was that with src resolution much bigger
// than dst res, the target could become very large
// in theory it was going to infinity when zooming in ...
// Note: original approach for xRes > srcXRes, yRes > srcYRes was to read directly with GDALRasterIO
// but we would face this problem:
// If the edge of the source is greater than the edge of destination:
// src: | | | | | | | | |
// dst: | | | |
// We have 2 options for resampling:
// a) 'Stretch' the src and align the start edge of src to the start edge of dst.
// That means however, that to the target cells may be assigned values of source
// which are not nearest to the center of dst cells. Usually probably not a problem
// but we are not precise. The shift is in maximum ... TODO
// b) We could cut the first destination column and left only the second one which is
// completely covered by src. No (significant) stretching is applied in that
// case, but the first column may be rendered as without values event if its center
// is covered by src column. That could result in wrongly rendered (missing) edges
// which could be easily noticed by user
// Because of problems mentioned above we read to another temporary block and do i
// another resampling here which appeares to be quite fast
// Get necessary src extent aligned to src resolution
if ( mExtent.xMinimum() < myRasterExtent.xMinimum() )
{
srcLeft = static_cast<int>( std::floor( ( myRasterExtent.xMinimum() - mExtent.xMinimum() ) / srcXRes ) );
}
if ( mExtent.xMaximum() > myRasterExtent.xMaximum() )
{
srcRight = static_cast<int>( std::floor( ( myRasterExtent.xMaximum() - mExtent.xMinimum() ) / srcXRes ) );
}
// GDAL states that mGeoTransform[3] is top, may it also be bottom and mGeoTransform[5] positive?
if ( mExtent.yMaximum() > myRasterExtent.yMaximum() )
{
srcTop = static_cast<int>( std::floor( -1. * ( mExtent.yMaximum() - myRasterExtent.yMaximum() ) / srcYRes ) );
}
if ( mExtent.yMinimum() < myRasterExtent.yMinimum() )
{
srcBottom = static_cast<int>( std::floor( -1. * ( mExtent.yMaximum() - myRasterExtent.yMinimum() ) / srcYRes ) );
}
QgsDebugMsgLevel( QString( "srcTop = %1 srcBottom = %2 srcLeft = %3 srcRight = %4" ).arg( srcTop ).arg( srcBottom ).arg( srcLeft ).arg( srcRight ), 5 );
int srcWidth = srcRight - srcLeft + 1;
int srcHeight = srcBottom - srcTop + 1;
QgsDebugMsgLevel( QString( "width = %1 height = %2 srcWidth = %3 srcHeight = %4" ).arg( width ).arg( height ).arg( srcWidth ).arg( srcHeight ), 5 );
int tmpWidth = srcWidth;
int tmpHeight = srcHeight;
if ( xRes > srcXRes )
{
tmpWidth = static_cast<int>( std::round( srcWidth * srcXRes / xRes ) );
}
if ( yRes > std::fabs( srcYRes ) )
{
tmpHeight = static_cast<int>( std::round( -1.*srcHeight * srcYRes / yRes ) );
}
double tmpXMin = mExtent.xMinimum() + srcLeft * srcXRes;
double tmpYMax = mExtent.yMaximum() + srcTop * srcYRes;
QgsDebugMsgLevel( QString( "tmpXMin = %1 tmpYMax = %2 tmpWidth = %3 tmpHeight = %4" ).arg( tmpXMin ).arg( tmpYMax ).arg( tmpWidth ).arg( tmpHeight ), 5 );
// Allocate temporary block
char *tmpBlock = ( char * )qgsMalloc( dataSize * tmpWidth * tmpHeight );
if ( ! tmpBlock )
{
QgsDebugMsgLevel( QString( "Couldn't allocate temporary buffer of %1 bytes" ).arg( dataSize * tmpWidth * tmpHeight ), 5 );
return;
}
GDALRasterBandH gdalBand = getBand( bandNo );
GDALDataType type = ( GDALDataType )mGdalDataType.at( bandNo - 1 );
CPLErrorReset();
CPLErr err = gdalRasterIO( gdalBand, GF_Read,
srcLeft, srcTop, srcWidth, srcHeight,
( void * )tmpBlock,
tmpWidth, tmpHeight, type,
0, 0, feedback );
if ( err != CPLE_None )
{
QgsLogger::warning( "RasterIO error: " + QString::fromUtf8( CPLGetLastErrorMsg() ) );
qgsFree( tmpBlock );
return;
}
double tmpXRes = srcWidth * srcXRes / tmpWidth;
double tmpYRes = srcHeight * srcYRes / tmpHeight; // negative
double y = myRasterExtent.yMaximum() - 0.5 * yRes;
for ( int row = 0; row < height; row++ )
{
int tmpRow = static_cast<int>( std::floor( -1. * ( tmpYMax - y ) / tmpYRes ) );
char *srcRowBlock = tmpBlock + dataSize * tmpRow * tmpWidth;
char *dstRowBlock = ( char * )block + dataSize * ( top + row ) * pixelWidth;
double x = ( myRasterExtent.xMinimum() + 0.5 * xRes - tmpXMin ) / tmpXRes; // cell center
double increment = xRes / tmpXRes;
char *dst = dstRowBlock + dataSize * left;
char *src = srcRowBlock;
int tmpCol = 0;
int lastCol = 0;
for ( int col = 0; col < width; ++col )
{
// std::floor() is quite slow! Use just cast to int.
tmpCol = static_cast<int>( x );
if ( tmpCol > lastCol )
{
src += ( tmpCol - lastCol ) * dataSize;
lastCol = tmpCol;
}
memcpy( dst, src, dataSize );
dst += dataSize;
x += increment;
}
y -= yRes;
}
qgsFree( tmpBlock );
}
//void * QgsGdalProvider::readBlock( int bandNo, QgsRectangle const & extent, int width, int height )
//{
// return 0;
//}
// this is old version which was using GDALWarpOperation, unfortunately
// it may be very slow on large datasets
#if 0
void QgsGdalProvider::readBlock( int bandNo, QgsRectangle const &extent, int pixelWidth, int pixelHeight, void *block )
{
QgsDebugMsg( "thePixelWidth = " + QString::number( pixelWidth ) );
QgsDebugMsg( "thePixelHeight = " + QString::number( pixelHeight ) );
QgsDebugMsg( "theExtent: " + extent.toString() );
QString myMemDsn;
myMemDsn.sprintf( "DATAPOINTER = %p", block );
QgsDebugMsg( myMemDsn );
//myMemDsn.sprintf( "MEM:::DATAPOINTER=%lu,PIXELS=%d,LINES=%d,BANDS=1,DATATYPE=%s,PIXELOFFSET=0,LINEOFFSET=0,BANDOFFSET=0", ( long )block, pixelWidth, pixelHeight, GDALGetDataTypeName(( GDALDataType )mGdalDataType[bandNo-1] ) );
char szPointer[64];
memset( szPointer, 0, sizeof( szPointer ) );
CPLPrintPointer( szPointer, block, sizeof( szPointer ) );
myMemDsn.sprintf( "MEM:::DATAPOINTER=%s,PIXELS=%d,LINES=%d,BANDS=1,DATATYPE=%s,PIXELOFFSET=0,LINEOFFSET=0,BANDOFFSET=0", szPointer, pixelWidth, pixelHeight, GDALGetDataTypeName( ( GDALDataType )mGdalDataType[bandNo - 1] ) );
QgsDebugMsg( "Open GDAL MEM : " + myMemDsn );
CPLErrorReset();
GDALDatasetH myGdalMemDataset = GDALOpen( TO8F( myMemDsn ), GA_Update );
if ( !myGdalMemDataset )
{
QMessageBox::warning( 0, QObject::tr( "Warning" ),
QObject::tr( "Cannot open GDAL MEM dataset %1: %2" ).arg( myMemDsn ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ) );
return;
}
//GDALSetProjection( myGdalMemDataset, destCRS.toWkt().toLatin1().constData() );
double myMemGeoTransform[6];
myMemGeoTransform[0] = extent.xMinimum(); // top left x
myMemGeoTransform[1] = extent.width() / pixelWidth; // w-e pixel resolution
myMemGeoTransform[2] = 0; // rotation, 0 if image is "north up"
myMemGeoTransform[3] = extent.yMaximum(); // top left y
myMemGeoTransform[4] = 0; // rotation, 0 if image is "north up"
myMemGeoTransform[5] = -1. * extent.height() / pixelHeight; // n-s pixel resolution
double myGeoTransform[6];
GDALGetGeoTransform( mGdalDataset, myGeoTransform );
// TODO:
// Attention: GDALCreateGenImgProjTransformer failes if source data source
// is not georeferenced, e.g. matrix 0,1,0,0,0,1/-1
// as a workaround in such case we have to set some different value - really ugly
myGeoTransform[0] = DBL_MIN;
GDALSetGeoTransform( mGdalDataset, myGeoTransform );
GDALSetGeoTransform( myGdalMemDataset, myMemGeoTransform );
for ( int i = 0; i < 6; i++ )
{
QgsDebugMsg( QString( "transform : %1 %2" ).arg( myGeoTransform[i] ).arg( myMemGeoTransform[i] ) );
}
GDALWarpOptions *myWarpOptions = GDALCreateWarpOptions();
myWarpOptions->hSrcDS = mGdalDataset;
myWarpOptions->hDstDS = myGdalMemDataset;
myWarpOptions->nBandCount = 1;
myWarpOptions->panSrcBands =
( int * ) qgsMalloc( sizeof( int ) * myWarpOptions->nBandCount );
myWarpOptions->panSrcBands[0] = bandNo;
myWarpOptions->panDstBands =
( int * ) qgsMalloc( sizeof( int ) * myWarpOptions->nBandCount );
myWarpOptions->panDstBands[0] = 1;
// TODO move here progressCallback and use it
myWarpOptions->pfnProgress = GDALTermProgress;
QgsDebugMsg( "src wkt: " + QString( GDALGetProjectionRef( mGdalDataset ) ) );
QgsDebugMsg( "dst wkt: " + QString( GDALGetProjectionRef( myGdalMemDataset ) ) );
myWarpOptions->pTransformerArg =
GDALCreateGenImgProjTransformer(
mGdalDataset,
nullptr,
myGdalMemDataset,
nullptr,
false, 0.0, 1
);
#if 0
myWarpOptions->pTransformerArg =
GDALCreateGenImgProjTransformer2(
mGdalDataset,
myGdalMemDataset,
nullptr
);
#endif
if ( !myWarpOptions->pTransformerArg )
{
QMessageBox::warning( 0, QObject::tr( "Warning" ),
QObject::tr( "Cannot GDALCreateGenImgProjTransformer: %1" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ); // missing word?
return;
}
//CPLAssert( myWarpOptions->pTransformerArg );
myWarpOptions->pfnTransformer = GDALGenImgProjTransform;
myWarpOptions->padfDstNoDataReal = ( double * ) qgsMalloc( myWarpOptions->nBandCount * sizeof( double ) );
myWarpOptions->padfDstNoDataImag = ( double * ) qgsMalloc( myWarpOptions->nBandCount * sizeof( double ) );
myWarpOptions->padfDstNoDataReal[0] = mNoDataValue[bandNo - 1];
myWarpOptions->padfDstNoDataImag[0] = 0.0;
GDALSetRasterNoDataValue( GDALGetRasterBand( myGdalMemDataset,
myWarpOptions->panDstBands[0] ),
myWarpOptions->padfDstNoDataReal[0] );
// TODO optimize somehow to avoid no data init if not necessary
// i.e. no projection, but there is also the problem with margine
myWarpOptions->papszWarpOptions =
CSLSetNameValue( myWarpOptions->papszWarpOptions, "INIT_DEST", "NO_DATA" );
myWarpOptions->eResampleAlg = GRA_NearestNeighbour;
GDALWarpOperation myOperation;
if ( myOperation.Initialize( myWarpOptions ) != CE_None )
{
QMessageBox::warning( 0, QObject::tr( "Warning" ),
QObject::tr( "Cannot initialize GDAL Warp operation : %1" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) );
return;
}
CPLErrorReset();
CPLErr myErr;
myErr = myOperation.ChunkAndWarpImage( 0, 0, pixelWidth, pixelHeight );
if ( myErr != CPLE_None )
{
QMessageBox::warning( 0, QObject::tr( "Warning" ),
QObject::tr( "Cannot chunk and warp image: %1" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ) );