/
qgsrasterlayer.cpp
2564 lines (2233 loc) · 91.8 KB
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qgsrasterlayer.cpp
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/***************************************************************************
qgsrasterlayer.cpp - description
-------------------
begin : Sat Jun 22 2002
copyright : (C) 2003 by Tim Sutton, Steve Halasz and Gary E.Sherman
email : tim at linfiniti.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 "qgsapplication.h"
#include "qgsbrightnesscontrastfilter.h"
#include "qgscolorrampshader.h"
#include "qgscoordinatereferencesystem.h"
#include "qgscoordinatetransform.h"
#include "qgsdatasourceuri.h"
#include "qgshuesaturationfilter.h"
#include "qgslayermetadataformatter.h"
#include "qgslogger.h"
#include "qgsmaplayerlegend.h"
#include "qgsmaptopixel.h"
#include "qgsmessagelog.h"
#include "qgsmultibandcolorrenderer.h"
#include "qgspainting.h"
#include "qgspalettedrasterrenderer.h"
#include "qgspathresolver.h"
#include "qgsprojectfiletransform.h"
#include "qgsproviderregistry.h"
#include "qgsrasterdataprovider.h"
#include "qgsrasterdrawer.h"
#include "qgsrasteriterator.h"
#include "qgsrasterlayer.h"
#include "qgsrasterlayerrenderer.h"
#include "qgsrasterprojector.h"
#include "qgsrasterrange.h"
#include "qgsrasterrendererregistry.h"
#include "qgsrasterresamplefilter.h"
#include "qgsrastershader.h"
#include "qgsreadwritecontext.h"
#include "qgsrectangle.h"
#include "qgsrendercontext.h"
#include "qgssinglebandcolordatarenderer.h"
#include "qgssinglebandgrayrenderer.h"
#include "qgssinglebandpseudocolorrenderer.h"
#include "qgssettings.h"
#include "qgssymbollayerutils.h"
#include "qgsgdalprovider.h"
#include "qgsbilinearrasterresampler.h"
#include "qgscubicrasterresampler.h"
#include "qgsrasterlayertemporalproperties.h"
#include "qgsruntimeprofiler.h"
#include <cmath>
#include <cstdio>
#include <limits>
#include <typeinfo>
#include <QApplication>
#include <QCursor>
#include <QDir>
#include <QDomElement>
#include <QDomNode>
#include <QFile>
#include <QFileInfo>
#include <QFont>
#include <QFontMetrics>
#include <QFrame>
#include <QImage>
#include <QLabel>
#include <QList>
#include <QMatrix>
#include <QMessageBox>
#include <QPainter>
#include <QPixmap>
#include <QRegExp>
#include <QSlider>
#define ERR(message) QGS_ERROR_MESSAGE(message,"Raster layer")
const double QgsRasterLayer::SAMPLE_SIZE = 250000;
const QgsContrastEnhancement::ContrastEnhancementAlgorithm
QgsRasterLayer::SINGLE_BAND_ENHANCEMENT_ALGORITHM = QgsContrastEnhancement::StretchToMinimumMaximum;
const QgsContrastEnhancement::ContrastEnhancementAlgorithm
QgsRasterLayer::MULTIPLE_BAND_SINGLE_BYTE_ENHANCEMENT_ALGORITHM = QgsContrastEnhancement::NoEnhancement;
const QgsContrastEnhancement::ContrastEnhancementAlgorithm
QgsRasterLayer::MULTIPLE_BAND_MULTI_BYTE_ENHANCEMENT_ALGORITHM = QgsContrastEnhancement::StretchToMinimumMaximum;
const QgsRasterMinMaxOrigin::Limits
QgsRasterLayer::SINGLE_BAND_MIN_MAX_LIMITS = QgsRasterMinMaxOrigin::MinMax;
const QgsRasterMinMaxOrigin::Limits
QgsRasterLayer::MULTIPLE_BAND_SINGLE_BYTE_MIN_MAX_LIMITS = QgsRasterMinMaxOrigin::MinMax;
const QgsRasterMinMaxOrigin::Limits
QgsRasterLayer::MULTIPLE_BAND_MULTI_BYTE_MIN_MAX_LIMITS = QgsRasterMinMaxOrigin::CumulativeCut;
QgsRasterLayer::QgsRasterLayer()
: QgsMapLayer( QgsMapLayerType::RasterLayer )
, QSTRING_NOT_SET( QStringLiteral( "Not Set" ) )
, TRSTRING_NOT_SET( tr( "Not Set" ) )
, mTemporalProperties( new QgsRasterLayerTemporalProperties( this ) )
{
init();
setValid( false );
}
QgsRasterLayer::QgsRasterLayer( const QString &uri,
const QString &baseName,
const QString &providerKey,
const LayerOptions &options )
: QgsMapLayer( QgsMapLayerType::RasterLayer, baseName, uri )
// Constant that signals property not used.
, QSTRING_NOT_SET( QStringLiteral( "Not Set" ) )
, TRSTRING_NOT_SET( tr( "Not Set" ) )
, mTemporalProperties( new QgsRasterLayerTemporalProperties( this ) )
{
mShouldValidateCrs = !options.skipCrsValidation;
QgsDebugMsgLevel( QStringLiteral( "Entered" ), 4 );
setProviderType( providerKey );
QgsDataProvider::ProviderOptions providerOptions { options.transformContext };
setDataSource( uri, baseName, providerKey, providerOptions, options.loadDefaultStyle );
if ( isValid() )
{
mTemporalProperties->setDefaultsFromDataProviderTemporalCapabilities( mDataProvider->temporalCapabilities() );
}
} // QgsRasterLayer ctor
QgsRasterLayer::~QgsRasterLayer()
{
emit willBeDeleted();
setValid( false );
// Note: provider and other interfaces are owned and deleted by pipe
}
QgsRasterLayer *QgsRasterLayer::clone() const
{
QgsRasterLayer::LayerOptions options;
if ( mDataProvider )
{
options.transformContext = mDataProvider->transformContext();
}
QgsRasterLayer *layer = new QgsRasterLayer( source(), name(), mProviderKey, options );
QgsMapLayer::clone( layer );
// do not clone data provider which is the first element in pipe
for ( int i = 1; i < mPipe.size(); i++ )
{
if ( mPipe.at( i ) )
layer->pipe()->set( mPipe.at( i )->clone() );
}
return layer;
}
//////////////////////////////////////////////////////////
//
// Static Methods and members
//
/////////////////////////////////////////////////////////
bool QgsRasterLayer::isValidRasterFileName( const QString &fileNameQString, QString &retErrMsg )
{
bool myIsValid = QgsGdalProvider::isValidRasterFileName( fileNameQString, retErrMsg );
return myIsValid;
}
bool QgsRasterLayer::isValidRasterFileName( QString const &fileNameQString )
{
QString retErrMsg;
return isValidRasterFileName( fileNameQString, retErrMsg );
}
QDateTime QgsRasterLayer::lastModified( QString const &name )
{
QgsDebugMsgLevel( "name=" + name, 4 );
QDateTime t;
QFileInfo fi( name );
// Is it file?
if ( !fi.exists() )
return t;
t = fi.lastModified();
QgsDebugMsgLevel( "last modified = " + t.toString(), 4 );
return t;
}
void QgsRasterLayer::setDataProvider( const QString &provider )
{
setDataProvider( provider, QgsDataProvider::ProviderOptions() );
}
// typedef for the QgsDataProvider class factory
typedef QgsDataProvider *classFactoryFunction_t( const QString *, const QgsDataProvider::ProviderOptions &options );
//////////////////////////////////////////////////////////
//
// Non Static Public methods
//
/////////////////////////////////////////////////////////
int QgsRasterLayer::bandCount() const
{
if ( !mDataProvider ) return 0;
return mDataProvider->bandCount();
}
QString QgsRasterLayer::bandName( int bandNo ) const
{
if ( !mDataProvider ) return QString();
return mDataProvider->generateBandName( bandNo );
}
void QgsRasterLayer::setRendererForDrawingStyle( QgsRaster::DrawingStyle drawingStyle )
{
setRenderer( QgsApplication::rasterRendererRegistry()->defaultRendererForDrawingStyle( drawingStyle, mDataProvider ) );
}
QgsRasterDataProvider *QgsRasterLayer::dataProvider()
{
return mDataProvider;
}
const QgsRasterDataProvider *QgsRasterLayer::dataProvider() const
{
return mDataProvider;
}
void QgsRasterLayer::reload()
{
if ( mDataProvider )
{
mDataProvider->reloadData();
}
}
QgsMapLayerRenderer *QgsRasterLayer::createMapRenderer( QgsRenderContext &rendererContext )
{
return new QgsRasterLayerRenderer( this, rendererContext );
}
void QgsRasterLayer::draw( QPainter *theQPainter,
QgsRasterViewPort *rasterViewPort,
const QgsMapToPixel *qgsMapToPixel )
{
QgsDebugMsgLevel( QStringLiteral( " 3 arguments" ), 4 );
QElapsedTimer time;
time.start();
//
//
// The goal here is to make as many decisions as possible early on (outside of the rendering loop)
// so that we can maximise performance of the rendering process. So now we check which drawing
// procedure to use :
//
QgsRasterProjector *projector = mPipe.projector();
bool restoreOldResamplingStage = false;
QgsRasterPipe::ResamplingStage oldResamplingState = resamplingStage();
// TODO add a method to interface to get provider and get provider
// params in QgsRasterProjector
if ( projector )
{
// Force provider resampling if reprojection is needed
if ( mDataProvider != nullptr &&
( mDataProvider->providerCapabilities() & QgsRasterDataProvider::ProviderHintCanPerformProviderResampling ) &&
rasterViewPort->mSrcCRS != rasterViewPort->mDestCRS &&
oldResamplingState != QgsRasterPipe::ResamplingStage::Provider )
{
restoreOldResamplingStage = true;
setResamplingStage( QgsRasterPipe::ResamplingStage::Provider );
}
projector->setCrs( rasterViewPort->mSrcCRS, rasterViewPort->mDestCRS, rasterViewPort->mTransformContext );
}
// Drawer to pipe?
QgsRasterIterator iterator( mPipe.last() );
QgsRasterDrawer drawer( &iterator );
drawer.draw( theQPainter, rasterViewPort, qgsMapToPixel );
if ( restoreOldResamplingStage )
{
setResamplingStage( oldResamplingState );
}
QgsDebugMsgLevel( QStringLiteral( "total raster draw time (ms): %1" ).arg( time.elapsed(), 5 ), 4 );
}
QgsLegendColorList QgsRasterLayer::legendSymbologyItems() const
{
QgsRasterRenderer *renderer = mPipe.renderer();
return renderer ? renderer->legendSymbologyItems() : QList< QPair< QString, QColor > >();;
}
QString QgsRasterLayer::htmlMetadata() const
{
QgsLayerMetadataFormatter htmlFormatter( metadata() );
QString myMetadata = QStringLiteral( "<html><head></head>\n<body>\n" );
// Begin Provider section
myMetadata += QStringLiteral( "<h1>" ) + tr( "Information from provider" ) + QStringLiteral( "</h1>\n<hr>\n" ) %
QStringLiteral( "<table class=\"list-view\">\n" ) %
// name
QStringLiteral( "<tr><td class=\"highlight\">" ) % tr( "Name" ) % QStringLiteral( "</td><td>" ) % name() % QStringLiteral( "</td></tr>\n" );
// local path
QVariantMap uriComponents = QgsProviderRegistry::instance()->decodeUri( mProviderKey, publicSource() );
QString path;
bool isLocalPath = false;
if ( uriComponents.contains( QStringLiteral( "path" ) ) )
{
path = uriComponents[QStringLiteral( "path" )].toString();
if ( QFile::exists( path ) )
{
isLocalPath = true;
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) % tr( "Path" ) % QStringLiteral( "</td><td>%1" ).arg( QStringLiteral( "<a href=\"%1\">%2</a>" ).arg( QUrl::fromLocalFile( path ).toString(), QDir::toNativeSeparators( path ) ) ) + QStringLiteral( "</td></tr>\n" );
}
}
if ( uriComponents.contains( QStringLiteral( "url" ) ) )
{
const QString url = uriComponents[QStringLiteral( "url" )].toString();
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) % tr( "URL" ) % QStringLiteral( "</td><td>%1" ).arg( QStringLiteral( "<a href=\"%1\">%2</a>" ).arg( QUrl( url ).toString(), url ) ) + QStringLiteral( "</td></tr>\n" );
}
// data source
if ( publicSource() != path || !isLocalPath )
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) + tr( "Source" ) + QStringLiteral( "</td><td>%1" ).arg( publicSource() != path ? publicSource() : path ) + QStringLiteral( "</td></tr>\n" );
// EPSG
myMetadata += QStringLiteral( "<tr><td class=\"highlight\">" ) % tr( "CRS" ) + QStringLiteral( "</td><td>" );
if ( crs().isValid() )
{
myMetadata += crs().userFriendlyIdentifier( QgsCoordinateReferenceSystem::FullString ) % QStringLiteral( " - " );
if ( crs().isGeographic() )
myMetadata += tr( "Geographic" );
else
myMetadata += tr( "Projected" );
}
myMetadata += QStringLiteral( "</td></tr>\n" ) %
// Extent
QStringLiteral( "<tr><td class=\"highlight\">" ) % tr( "Extent" ) % QStringLiteral( "</td><td>" ) % extent().toString() % QStringLiteral( "</td></tr>\n" ) %
// unit
QStringLiteral( "<tr><td class=\"highlight\">" ) % tr( "Unit" ) % QStringLiteral( "</td><td>" ) % QgsUnitTypes::toString( crs().mapUnits() ) % QStringLiteral( "</td></tr>\n" ) %
// Raster Width
QStringLiteral( "<tr><td class=\"highlight\">" ) % tr( "Width" ) % QStringLiteral( "</td><td>" );
if ( dataProvider()->capabilities() & QgsRasterDataProvider::Size )
myMetadata += QString::number( width() );
else
myMetadata += tr( "n/a" );
myMetadata += QStringLiteral( "</td></tr>\n" ) %
// Raster height
QStringLiteral( "<tr><td class=\"highlight\">" ) + tr( "Height" ) + QStringLiteral( "</td><td>" );
if ( dataProvider()->capabilities() & QgsRasterDataProvider::Size )
myMetadata += QString::number( height() );
else
myMetadata += tr( "n/a" );
myMetadata += QStringLiteral( "</td></tr>\n" ) %
// Data type
QStringLiteral( "<tr><td class=\"highlight\">" ) % tr( "Data type" ) % QStringLiteral( "</td><td>" );
// Just use the first band
switch ( mDataProvider->sourceDataType( 1 ) )
{
case Qgis::Byte:
myMetadata += tr( "Byte - Eight bit unsigned integer" );
break;
case Qgis::UInt16:
myMetadata += tr( "UInt16 - Sixteen bit unsigned integer " );
break;
case Qgis::Int16:
myMetadata += tr( "Int16 - Sixteen bit signed integer " );
break;
case Qgis::UInt32:
myMetadata += tr( "UInt32 - Thirty two bit unsigned integer " );
break;
case Qgis::Int32:
myMetadata += tr( "Int32 - Thirty two bit signed integer " );
break;
case Qgis::Float32:
myMetadata += tr( "Float32 - Thirty two bit floating point " );
break;
case Qgis::Float64:
myMetadata += tr( "Float64 - Sixty four bit floating point " );
break;
case Qgis::CInt16:
myMetadata += tr( "CInt16 - Complex Int16 " );
break;
case Qgis::CInt32:
myMetadata += tr( "CInt32 - Complex Int32 " );
break;
case Qgis::CFloat32:
myMetadata += tr( "CFloat32 - Complex Float32 " );
break;
case Qgis::CFloat64:
myMetadata += tr( "CFloat64 - Complex Float64 " );
break;
default:
myMetadata += tr( "Could not determine raster data type." );
}
myMetadata += QStringLiteral( "</td></tr>\n" ) %
// Insert provider-specific (e.g. WMS-specific) metadata
mDataProvider->htmlMetadata() %
// End Provider section
QStringLiteral( "</table>\n<br><br>" ) %
// Identification section
QStringLiteral( "<h1>" ) % tr( "Identification" ) % QStringLiteral( "</h1>\n<hr>\n" ) %
htmlFormatter.identificationSectionHtml() %
QStringLiteral( "<br><br>\n" ) %
// extent section
QStringLiteral( "<h1>" ) % tr( "Extent" ) % QStringLiteral( "</h1>\n<hr>\n" ) %
htmlFormatter.extentSectionHtml( ) %
QStringLiteral( "<br><br>\n" ) %
// Start the Access section
QStringLiteral( "<h1>" ) % tr( "Access" ) % QStringLiteral( "</h1>\n<hr>\n" ) %
htmlFormatter.accessSectionHtml( ) %
QStringLiteral( "<br><br>\n" ) %
// Bands section
QStringLiteral( "</table>\n<br><br><h1>" ) % tr( "Bands" ) % QStringLiteral( "</h1>\n<hr>\n<table class=\"list-view\">\n" ) %
// Band count
QStringLiteral( "<tr><td class=\"highlight\">" ) % tr( "Band count" ) % QStringLiteral( "</td><td>" ) % QString::number( bandCount() ) % QStringLiteral( "</td></tr>\n" );
// Band table
myMetadata += QStringLiteral( "</table>\n<br><table width=\"100%\" class=\"tabular-view\">\n" ) %
QStringLiteral( "<tr><th>" ) % tr( "Number" ) % QStringLiteral( "</th><th>" ) % tr( "Band" ) % QStringLiteral( "</th><th>" ) % tr( "No-Data" ) % QStringLiteral( "</th><th>" ) %
tr( "Min" ) % QStringLiteral( "</th><th>" ) % tr( "Max" ) % QStringLiteral( "</th></tr>\n" );
QgsRasterDataProvider *provider = const_cast< QgsRasterDataProvider * >( mDataProvider );
for ( int i = 1; i <= bandCount(); i++ )
{
QString rowClass;
if ( i % 2 )
rowClass = QStringLiteral( "class=\"odd-row\"" );
myMetadata += QStringLiteral( "<tr " ) % rowClass % QStringLiteral( "><td>" ) % QString::number( i ) % QStringLiteral( "</td><td>" ) % bandName( i ) % QStringLiteral( "</td><td>" );
if ( dataProvider()->sourceHasNoDataValue( i ) )
myMetadata += QString::number( dataProvider()->sourceNoDataValue( i ) );
else
myMetadata += tr( "n/a" );
myMetadata += QLatin1String( "</td>" );
if ( provider->hasStatistics( i ) )
{
QgsRasterBandStats myRasterBandStats = provider->bandStatistics( i );
myMetadata += QStringLiteral( "<td>" ) % QString::number( myRasterBandStats.minimumValue, 'f', 10 ) % QStringLiteral( "</td>" ) %
QStringLiteral( "<td>" ) % QString::number( myRasterBandStats.maximumValue, 'f', 10 ) % QStringLiteral( "</td>" );
}
else
{
myMetadata += QStringLiteral( "<td>" ) % tr( "n/a" ) % QStringLiteral( "</td><td>" ) % tr( "n/a" ) % QStringLiteral( "</td>" );
}
myMetadata += QLatin1String( "</tr>\n" );
}
//close previous bands table
myMetadata += QStringLiteral( "</table>\n<br><br>" ) %
// Start the contacts section
QStringLiteral( "<h1>" ) % tr( "Contacts" ) % QStringLiteral( "</h1>\n<hr>\n" ) %
htmlFormatter.contactsSectionHtml( ) %
QStringLiteral( "<br><br>\n" ) %
// Start the links section
QStringLiteral( "<h1>" ) % tr( "References" ) % QStringLiteral( "</h1>\n<hr>\n" ) %
htmlFormatter.linksSectionHtml( ) %
QStringLiteral( "<br><br>\n" ) %
// Start the history section
QStringLiteral( "<h1>" ) % tr( "History" ) % QStringLiteral( "</h1>\n<hr>\n" ) %
htmlFormatter.historySectionHtml( ) %
QStringLiteral( "<br><br>\n" ) %
QStringLiteral( "\n</body>\n</html>\n" );
return myMetadata;
}
QPixmap QgsRasterLayer::paletteAsPixmap( int bandNumber )
{
//TODO: This function should take dimensions
QgsDebugMsgLevel( QStringLiteral( "entered." ), 4 );
// Only do this for the GDAL provider?
// Maybe WMS can do this differently using QImage::numColors and QImage::color()
if ( mDataProvider &&
mDataProvider->colorInterpretation( bandNumber ) == QgsRaster::PaletteIndex )
{
QgsDebugMsgLevel( QStringLiteral( "....found paletted image" ), 4 );
QgsColorRampShader myShader;
QList<QgsColorRampShader::ColorRampItem> myColorRampItemList = mDataProvider->colorTable( bandNumber );
if ( !myColorRampItemList.isEmpty() )
{
QgsDebugMsgLevel( QStringLiteral( "....got color ramp item list" ), 4 );
myShader.setColorRampItemList( myColorRampItemList );
myShader.setColorRampType( QgsColorRampShader::Discrete );
// Draw image
int mySize = 100;
QPixmap myPalettePixmap( mySize, mySize );
QPainter myQPainter( &myPalettePixmap );
QImage myQImage = QImage( mySize, mySize, QImage::Format_RGB32 );
myQImage.fill( 0 );
myPalettePixmap.fill();
double myStep = ( static_cast< double >( myColorRampItemList.size() ) - 1 ) / static_cast< double >( mySize * mySize );
double myValue = 0.0;
for ( int myRow = 0; myRow < mySize; myRow++ )
{
QRgb *myLineBuffer = reinterpret_cast< QRgb * >( myQImage.scanLine( myRow ) );
for ( int myCol = 0; myCol < mySize; myCol++ )
{
myValue = myStep * static_cast< double >( myCol + myRow * mySize );
int c1, c2, c3, c4;
myShader.shade( myValue, &c1, &c2, &c3, &c4 );
myLineBuffer[ myCol ] = qRgba( c1, c2, c3, c4 );
}
}
myQPainter.drawImage( 0, 0, myQImage );
return myPalettePixmap;
}
QPixmap myNullPixmap;
return myNullPixmap;
}
else
{
//invalid layer was requested
QPixmap myNullPixmap;
return myNullPixmap;
}
}
QString QgsRasterLayer::providerType() const
{
return mProviderKey;
}
double QgsRasterLayer::rasterUnitsPerPixelX() const
{
// We return one raster pixel per map unit pixel
// One raster pixel can have several raster units...
// We can only use one of the mGeoTransform[], so go with the
// horisontal one.
if ( mDataProvider &&
mDataProvider->capabilities() & QgsRasterDataProvider::Size && !qgsDoubleNear( mDataProvider->xSize(), 0.0 ) )
{
return mDataProvider->extent().width() / mDataProvider->xSize();
}
return 1;
}
double QgsRasterLayer::rasterUnitsPerPixelY() const
{
if ( mDataProvider &&
mDataProvider->capabilities() & QgsRasterDataProvider::Size && !qgsDoubleNear( mDataProvider->ySize(), 0.0 ) )
{
return mDataProvider->extent().height() / mDataProvider->ySize();
}
return 1;
}
void QgsRasterLayer::setOpacity( double opacity )
{
if ( !mPipe.renderer() || mPipe.renderer()->opacity() == opacity )
return;
mPipe.renderer()->setOpacity( opacity );
emit opacityChanged( opacity );
emit styleChanged();
}
double QgsRasterLayer::opacity() const
{
return mPipe.renderer() ? mPipe.renderer()->opacity() : 1.0;
}
void QgsRasterLayer::init()
{
mRasterType = QgsRasterLayer::GrayOrUndefined;
setLegend( QgsMapLayerLegend::defaultRasterLegend( this ) );
setRendererForDrawingStyle( QgsRaster::UndefinedDrawingStyle );
//Initialize the last view port structure, should really be a class
mLastViewPort.mWidth = 0;
mLastViewPort.mHeight = 0;
}
void QgsRasterLayer::setDataProvider( QString const &provider, const QgsDataProvider::ProviderOptions &options, QgsDataProvider::ReadFlags flags )
{
QgsDebugMsgLevel( QStringLiteral( "Entered" ), 4 );
setValid( false ); // assume the layer is invalid until we determine otherwise
mPipe.remove( mDataProvider ); // deletes if exists
mDataProvider = nullptr;
// XXX should I check for and possibly delete any pre-existing providers?
// XXX How often will that scenario occur?
mProviderKey = provider;
// set the layer name (uppercase first character)
if ( ! mLayerName.isEmpty() ) // XXX shouldn't this happen in parent?
{
setName( mLayerName );
}
//mBandCount = 0;
std::unique_ptr< QgsScopedRuntimeProfile > profile;
if ( QgsApplication::profiler()->groupIsActive( QStringLiteral( "projectload" ) ) )
profile = qgis::make_unique< QgsScopedRuntimeProfile >( tr( "Create %1 provider" ).arg( provider ), QStringLiteral( "projectload" ) );
mDataProvider = qobject_cast< QgsRasterDataProvider * >( QgsProviderRegistry::instance()->createProvider( mProviderKey, mDataSource, options, flags ) );
if ( !mDataProvider )
{
//QgsMessageLog::logMessage( tr( "Cannot instantiate the data provider" ), tr( "Raster" ) );
appendError( ERR( tr( "Cannot instantiate the '%1' data provider" ).arg( mProviderKey ) ) );
return;
}
QgsDebugMsgLevel( QStringLiteral( "Data provider created" ), 4 );
mDataProvider->setParent( this );
// Set data provider into pipe even if not valid so that it is deleted with pipe (with layer)
mPipe.set( mDataProvider );
if ( !mDataProvider->isValid() )
{
setError( mDataProvider->error() );
appendError( ERR( tr( "Provider is not valid (provider: %1, URI: %2" ).arg( mProviderKey, mDataSource ) ) );
return;
}
if ( mDataProvider->providerCapabilities() & QgsRasterDataProvider::ReadLayerMetadata )
{
setMetadata( mDataProvider->layerMetadata() );
QgsDebugMsgLevel( QStringLiteral( "Set Data provider QgsLayerMetadata identifier[%1]" ).arg( metadata().identifier() ), 4 );
}
if ( provider == QLatin1String( "gdal" ) )
{
// make sure that the /vsigzip or /vsizip is added to uri, if applicable
mDataSource = mDataProvider->dataSourceUri();
}
// get the extent
QgsRectangle mbr = mDataProvider->extent();
// show the extent
QgsDebugMsgLevel( "Extent of layer: " + mbr.toString(), 4 );
// store the extent
setExtent( mbr );
// upper case the first letter of the layer name
QgsDebugMsgLevel( "mLayerName: " + name(), 4 );
// set up the raster drawing style
// Do not set any 'sensible' style here, the style is set later
// Setup source CRS
setCrs( QgsCoordinateReferenceSystem( mDataProvider->crs() ) );
QgsDebugMsgLevel( "using wkt:\n" + crs().toWkt( QgsCoordinateReferenceSystem::WKT_PREFERRED ), 4 );
//defaults - Needs to be set after the Contrast list has been build
//Try to read the default contrast enhancement from the config file
//decide what type of layer this is...
//TODO Change this to look at the color interp and palette interp to decide which type of layer it is
QgsDebugMsgLevel( "bandCount = " + QString::number( mDataProvider->bandCount() ), 4 );
QgsDebugMsgLevel( "dataType = " + QString::number( mDataProvider->dataType( 1 ) ), 4 );
if ( ( mDataProvider->bandCount() > 1 ) )
{
// handle singleband gray with alpha
if ( mDataProvider->bandCount() == 2
&& ( ( mDataProvider->colorInterpretation( 1 ) == QgsRaster::GrayIndex
&& mDataProvider->colorInterpretation( 2 ) == QgsRaster::AlphaBand )
|| ( mDataProvider->colorInterpretation( 1 ) == QgsRaster::AlphaBand
&& mDataProvider->colorInterpretation( 2 ) == QgsRaster::GrayIndex ) ) )
{
mRasterType = GrayOrUndefined;
}
else
{
mRasterType = Multiband;
}
}
else if ( mDataProvider->dataType( 1 ) == Qgis::ARGB32
|| mDataProvider->dataType( 1 ) == Qgis::ARGB32_Premultiplied )
{
mRasterType = ColorLayer;
}
else if ( mDataProvider->colorInterpretation( 1 ) == QgsRaster::PaletteIndex )
{
mRasterType = Palette;
}
else if ( mDataProvider->colorInterpretation( 1 ) == QgsRaster::ContinuousPalette )
{
mRasterType = Palette;
}
else
{
mRasterType = GrayOrUndefined;
}
QgsDebugMsgLevel( "mRasterType = " + QString::number( mRasterType ), 4 );
if ( mRasterType == ColorLayer )
{
QgsDebugMsgLevel( "Setting drawing style to SingleBandColorDataStyle " + QString::number( QgsRaster::SingleBandColorDataStyle ), 4 );
setRendererForDrawingStyle( QgsRaster::SingleBandColorDataStyle );
}
else if ( mRasterType == Palette && mDataProvider->colorInterpretation( 1 ) == QgsRaster::PaletteIndex )
{
setRendererForDrawingStyle( QgsRaster::PalettedColor ); //sensible default
}
else if ( mRasterType == Palette && mDataProvider->colorInterpretation( 1 ) == QgsRaster::ContinuousPalette )
{
setRendererForDrawingStyle( QgsRaster::SingleBandPseudoColor );
// Load color table
QList<QgsColorRampShader::ColorRampItem> colorTable = mDataProvider->colorTable( 1 );
QgsSingleBandPseudoColorRenderer *r = dynamic_cast<QgsSingleBandPseudoColorRenderer *>( renderer() );
if ( r )
{
// TODO: this should go somewhere else
QgsRasterShader *shader = new QgsRasterShader();
QgsColorRampShader *colorRampShader = new QgsColorRampShader();
colorRampShader->setColorRampType( QgsColorRampShader::Interpolated );
colorRampShader->setColorRampItemList( colorTable );
shader->setRasterShaderFunction( colorRampShader );
r->setShader( shader );
}
}
else if ( mRasterType == Multiband )
{
setRendererForDrawingStyle( QgsRaster::MultiBandColor ); //sensible default
}
else //GrayOrUndefined
{
setRendererForDrawingStyle( QgsRaster::SingleBandGray ); //sensible default
}
// Auto set alpha band
for ( int bandNo = 1; bandNo <= mDataProvider->bandCount(); bandNo++ )
{
if ( mDataProvider->colorInterpretation( bandNo ) == QgsRaster::AlphaBand )
{
if ( auto *lRenderer = mPipe.renderer() )
{
lRenderer->setAlphaBand( bandNo );
}
break;
}
}
// brightness filter
QgsBrightnessContrastFilter *brightnessFilter = new QgsBrightnessContrastFilter();
mPipe.set( brightnessFilter );
// hue/saturation filter
QgsHueSaturationFilter *hueSaturationFilter = new QgsHueSaturationFilter();
mPipe.set( hueSaturationFilter );
// resampler (must be after renderer)
QgsRasterResampleFilter *resampleFilter = new QgsRasterResampleFilter();
mPipe.set( resampleFilter );
if ( mDataProvider->providerCapabilities() & QgsRasterDataProvider::ProviderHintBenefitsFromResampling )
{
QgsSettings settings;
QString resampling = settings.value( QStringLiteral( "/Raster/defaultZoomedInResampling" ), QStringLiteral( "nearest neighbour" ) ).toString();
if ( resampling == QLatin1String( "bilinear" ) )
{
resampleFilter->setZoomedInResampler( new QgsBilinearRasterResampler() );
mDataProvider->setZoomedInResamplingMethod( QgsRasterDataProvider::ResamplingMethod::Bilinear );
}
else if ( resampling == QLatin1String( "cubic" ) )
{
resampleFilter->setZoomedInResampler( new QgsCubicRasterResampler() );
mDataProvider->setZoomedInResamplingMethod( QgsRasterDataProvider::ResamplingMethod::Cubic );
}
resampling = settings.value( QStringLiteral( "/Raster/defaultZoomedOutResampling" ), QStringLiteral( "nearest neighbour" ) ).toString();
if ( resampling == QLatin1String( "bilinear" ) )
{
resampleFilter->setZoomedOutResampler( new QgsBilinearRasterResampler() );
mDataProvider->setZoomedOutResamplingMethod( QgsRasterDataProvider::ResamplingMethod::Bilinear );
}
const double maxOversampling = settings.value( QStringLiteral( "/Raster/defaultOversampling" ), 2.0 ).toDouble();
resampleFilter->setMaxOversampling( maxOversampling );
mDataProvider->setMaxOversampling( maxOversampling );
if ( ( mDataProvider->providerCapabilities() & QgsRasterDataProvider::ProviderHintCanPerformProviderResampling ) &&
settings.value( QStringLiteral( "/Raster/defaultEarlyResampling" ), false ).toBool() )
{
setResamplingStage( QgsRasterPipe::ResamplingStage::Provider );
}
else
{
setResamplingStage( QgsRasterPipe::ResamplingStage::ResampleFilter );
}
}
// projector (may be anywhere in pipe)
QgsRasterProjector *projector = new QgsRasterProjector;
mPipe.set( projector );
// Set default identify format - use the richest format available
int capabilities = mDataProvider->capabilities();
QgsRaster::IdentifyFormat identifyFormat = QgsRaster::IdentifyFormatUndefined;
if ( capabilities & QgsRasterInterface::IdentifyHtml )
{
// HTML is usually richest
identifyFormat = QgsRaster::IdentifyFormatHtml;
}
else if ( capabilities & QgsRasterInterface::IdentifyFeature )
{
identifyFormat = QgsRaster::IdentifyFormatFeature;
}
else if ( capabilities & QgsRasterInterface::IdentifyText )
{
identifyFormat = QgsRaster::IdentifyFormatText;
}
else if ( capabilities & QgsRasterInterface::IdentifyValue )
{
identifyFormat = QgsRaster::IdentifyFormatValue;
}
setCustomProperty( QStringLiteral( "identify/format" ), QgsRasterDataProvider::identifyFormatName( identifyFormat ) );
// Store timestamp
// TODO move to provider
mLastModified = lastModified( mDataSource );
// Do a passthrough for the status bar text
connect( mDataProvider, &QgsRasterDataProvider::statusChanged, this, &QgsRasterLayer::statusChanged );
//mark the layer as valid
setValid( true );
if ( mDataProvider->supportsSubsetString() )
connect( this, &QgsRasterLayer::subsetStringChanged, this, &QgsMapLayer::configChanged, Qt::UniqueConnection );
else
disconnect( this, &QgsRasterLayer::subsetStringChanged, this, &QgsMapLayer::configChanged );
QgsDebugMsgLevel( QStringLiteral( "exiting." ), 4 );
}
void QgsRasterLayer::setDataSource( const QString &dataSource, const QString &baseName, const QString &provider, const QgsDataProvider::ProviderOptions &options, bool loadDefaultStyleFlag )
{
bool hadRenderer( renderer() );
QDomImplementation domImplementation;
QDomDocumentType documentType;
QString errorMsg;
// Store the original style
if ( hadRenderer && ! loadDefaultStyleFlag )
{
documentType = domImplementation.createDocumentType(
QStringLiteral( "qgis" ), QStringLiteral( "http://mrcc.com/qgis.dtd" ), QStringLiteral( "SYSTEM" ) );
QDomDocument doc = QDomDocument( documentType );
QDomElement styleElem = doc.createElement( QStringLiteral( "qgis" ) );
styleElem.setAttribute( QStringLiteral( "version" ), Qgis::version() );
QgsReadWriteContext writeContext;
if ( ! writeSymbology( styleElem, doc, errorMsg, writeContext ) )
{
QgsDebugMsg( QStringLiteral( "Could not store symbology for layer %1: %2" )
.arg( name(),
errorMsg ) );
}
else
{
doc.appendChild( styleElem );
mOriginalStyleDocument = doc;
mOriginalStyleElement = styleElem;
}
}
if ( mDataProvider )
closeDataProvider();
init();
for ( int i = mPipe.size() - 1; i >= 0; --i )
{
mPipe.remove( i );
}
mDataSource = dataSource;
mLayerName = baseName;
QgsDataProvider::ReadFlags flags = QgsDataProvider::ReadFlags();
if ( mReadFlags & QgsMapLayer::FlagTrustLayerMetadata )
{
flags |= QgsDataProvider::FlagTrustDataSource;
}
setDataProvider( provider, options, flags );
if ( mDataProvider )
mDataProvider->setDataSourceUri( mDataSource );
if ( isValid() )
{
// load default style
bool defaultLoadedFlag = false;
bool restoredStyle = false;
if ( loadDefaultStyleFlag )
{
loadDefaultStyle( defaultLoadedFlag );
}
else if ( !mOriginalStyleElement.isNull() ) // Restore the style
{
QgsReadWriteContext readContext;
if ( ! readSymbology( mOriginalStyleElement, errorMsg, readContext ) )
{
QgsDebugMsg( QStringLiteral( "Could not restore symbology for layer %1: %2" )
.arg( name() )
.arg( errorMsg ) );
}
else
{
restoredStyle = true;
emit repaintRequested();
emit styleChanged();
emit rendererChanged();
}
}
if ( !defaultLoadedFlag && !restoredStyle )
{
setDefaultContrastEnhancement();
}
}
emit dataSourceChanged();
emit dataChanged();
}
void QgsRasterLayer::closeDataProvider()
{
setValid( false );
mPipe.remove( mDataProvider );
mDataProvider = nullptr;
}
void QgsRasterLayer::computeMinMax( int band,
const QgsRasterMinMaxOrigin &mmo,
QgsRasterMinMaxOrigin::Limits limits,
const QgsRectangle &extent,
int sampleSize,
double &min, double &max )
{
min = std::numeric_limits<double>::quiet_NaN();
max = std::numeric_limits<double>::quiet_NaN();
if ( !mDataProvider )
return;
if ( limits == QgsRasterMinMaxOrigin::MinMax )
{
QgsRasterBandStats myRasterBandStats = mDataProvider->bandStatistics( band, QgsRasterBandStats::Min | QgsRasterBandStats::Max, extent, sampleSize );
// Check if statistics were actually gathered, None means a failure
if ( myRasterBandStats.statsGathered == QgsRasterBandStats::Stats::None )
{
// Best guess we can do
switch ( mDataProvider->dataType( band ) )
{