/
qgswmsprovider.cpp
4201 lines (3539 loc) · 137 KB
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qgswmsprovider.cpp
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/***************************************************************************
qgswmsprovider.cpp - QGIS Data provider for
OGC Web Map Service layers
-------------------
begin : 17 Mar, 2005
copyright : (C) 2005 by Brendan Morley
email : morb at ozemail dot com dot au
wms-c/wmts support : Jürgen E. Fischer < jef at norbit dot de >, norBIT GmbH
tile retry support : Luigi Pirelli < luipir at gmail dot com >
(funded by Regione Toscana-SITA)
contextual wms legend: Sandro Santilli < strk at keybit dot net >
***************************************************************************/
/***************************************************************************
* *
* 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 "qgswmsprovider.h"
#include "qgswmsconnection.h"
#include "qgscoordinatetransform.h"
#include "qgsdatasourceuri.h"
#include "qgsfeaturestore.h"
#include "qgsgeometry.h"
#include "qgsrasteridentifyresult.h"
#include "qgsrasterlayer.h"
#include "qgsrectangle.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsmapsettings.h"
#include "qgsmessageoutput.h"
#include "qgsmessagelog.h"
#include "qgsnetworkaccessmanager.h"
#include "qgsnetworkreplyparser.h"
#include "qgstilecache.h"
#include "qgsgml.h"
#include "qgsgmlschema.h"
#include "qgswmscapabilities.h"
#include "qgscsexception.h"
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QNetworkProxy>
#include <QUrl>
#include <QImage>
#include <QImageReader>
#include <QPainter>
#include <QSettings>
#include <QEventLoop>
#include <QTextCodec>
#include <QThread>
#include <QScriptEngine>
#include <QScriptValue>
#include <QScriptValueIterator>
#include <QNetworkDiskCache>
#include <QTimer>
#include <ogr_api.h>
#ifdef QGISDEBUG
#include <QFile>
#include <QDir>
#endif
#define ERR(message) QGS_ERROR_MESSAGE(message,"WMS provider")
#define QGS_ERROR(message) QgsError(message,"WMS provider")
static QString WMS_KEY = "wms";
static QString WMS_DESCRIPTION = "OGC Web Map Service version 1.3 data provider";
static QString DEFAULT_LATLON_CRS = "CRS:84";
QMap<QString, QgsWmsStatistics::Stat> QgsWmsStatistics::sData;
//! a helper class for ordering tile requests according to the distance from view center
struct LessThanTileRequest
{
QgsPoint center;
bool operator()( const QgsWmsProvider::TileRequest &req1, const QgsWmsProvider::TileRequest &req2 )
{
QPointF p1 = req1.rect.center();
QPointF p2 = req2.rect.center();
// using chessboard distance (loading order more natural than euclidean/manhattan distance)
double d1 = qMax( qAbs( center.x() - p1.x() ), qAbs( center.y() - p1.y() ) );
double d2 = qMax( qAbs( center.x() - p2.x() ), qAbs( center.y() - p2.y() ) );
return d1 < d2;
}
};
QgsWmsProvider::QgsWmsProvider( QString const& uri, const QgsWmsCapabilities* capabilities )
: QgsRasterDataProvider( uri )
, mHttpGetLegendGraphicResponse( nullptr )
, mGetLegendGraphicImage()
, mGetLegendGraphicScale( 0.0 )
, mImageCrs( DEFAULT_LATLON_CRS )
, mIdentifyReply( nullptr )
, mExtentDirty( true )
, mTileReqNo( 0 )
, mTileLayer( nullptr )
, mTileMatrixSet( nullptr )
{
QgsDebugMsg( "constructing with uri '" + uri + "'." );
mSupportedGetFeatureFormats = QStringList() << "text/html" << "text/plain" << "text/xml" << "application/vnd.ogc.gml" << "application/json";
mValid = false;
// URL may contain username/password information for a WMS
// requiring authentication. In this case the URL is prefixed
// with username=user,password=pass,url=http://xxx.xxx.xx/yyy...
if ( !mSettings.parseUri( uri ) )
{
appendError( ERR( tr( "Cannot parse URI" ) ) );
return;
}
if ( !addLayers() )
return;
if ( mSettings.mXyz )
{
// we are working with XYZ tiles
// no need to get capabilities, the whole definition is in URI
// so we just generate a dummy WMTS definition
setupXyzCapabilities( uri );
}
else
{
// we are working with WMS / WMTS server
// if there are already parsed capabilities, use them!
if ( capabilities )
mCaps = *capabilities;
// Make sure we have capabilities - other functions here may need them
if ( !retrieveServerCapabilities() )
{
return;
}
}
// setImageCrs is using mTiled !!!
if ( !setImageCrs( mSettings.mCrsId ) )
{
appendError( ERR( tr( "Cannot set CRS" ) ) );
return;
}
mCrs = QgsCoordinateReferenceSystem::fromOgcWmsCrs( mSettings.mCrsId );
if ( !calculateExtent() || mLayerExtent.isEmpty() )
{
appendError( ERR( tr( "Cannot calculate extent" ) ) );
return;
}
// URL can be in 3 forms:
// 1) http://xxx.xxx.xx/yyy/yyy
// 2) http://xxx.xxx.xx/yyy/yyy?
// 3) http://xxx.xxx.xx/yyy/yyy?zzz=www
mValid = true;
QgsDebugMsg( "exiting constructor." );
}
QString QgsWmsProvider::prepareUri( QString uri )
{
if ( uri.contains( "SERVICE=WMTS" ) || uri.contains( "/WMTSCapabilities.xml" ) )
{
return uri;
}
if ( !uri.contains( "?" ) )
{
uri.append( '?' );
}
else if ( uri.right( 1 ) != "?" && uri.right( 1 ) != "&" )
{
uri.append( '&' );
}
return uri;
}
QgsWmsProvider::~QgsWmsProvider()
{
QgsDebugMsg( "deconstructing." );
}
QgsWmsProvider* QgsWmsProvider::clone() const
{
QgsWmsProvider* provider = new QgsWmsProvider( dataSourceUri(), mCaps.isValid() ? &mCaps : nullptr );
provider->copyBaseSettings( *this );
return provider;
}
QString QgsWmsProvider::getMapUrl() const
{
return mCaps.mCapabilities.capability.request.getMap.dcpType.isEmpty()
? mSettings.mBaseUrl
: prepareUri( mCaps.mCapabilities.capability.request.getMap.dcpType.front().http.get.onlineResource.xlinkHref );
}
QString QgsWmsProvider::getFeatureInfoUrl() const
{
return mCaps.mCapabilities.capability.request.getFeatureInfo.dcpType.isEmpty()
? mSettings.mBaseUrl
: prepareUri( mCaps.mCapabilities.capability.request.getFeatureInfo.dcpType.front().http.get.onlineResource.xlinkHref );
}
QString QgsWmsProvider::getTileUrl() const
{
if ( mCaps.mCapabilities.capability.request.getTile.dcpType.isEmpty() ||
( !mCaps.mCapabilities.capability.request.getTile.allowedEncodings.isEmpty() &&
!mCaps.mCapabilities.capability.request.getTile.allowedEncodings.contains( "KVP" ) ) )
{
return QString::null;
}
else
{
return prepareUri( mCaps.mCapabilities.capability.request.getTile.dcpType.front().http.get.onlineResource.xlinkHref );
}
}
static bool isValidLegend( const QgsWmsLegendUrlProperty &l )
{
return l.format.startsWith( "image/" );
}
/**
* Picks a usable legend URL for a given style.
*/
static QString pickLegend( const QgsWmsStyleProperty &s )
{
QString url;
for ( int k = 0; k < s.legendUrl.size() && url.isEmpty(); k++ )
{
const QgsWmsLegendUrlProperty &l = s.legendUrl[k];
if ( isValidLegend( l ) )
{
url = l.onlineResource.xlinkHref;
}
}
return url;
}
static const QgsWmsStyleProperty *searchStyle( const QVector<QgsWmsStyleProperty>& styles, const QString& name )
{
Q_FOREACH ( const QgsWmsStyleProperty &s, styles )
if ( s.name == name )
return &s;
return nullptr;
}
QString QgsWmsProvider::getLegendGraphicUrl() const
{
QString url;
for ( int i = 0; i < mCaps.mLayersSupported.size() && url.isEmpty(); i++ )
{
const QgsWmsLayerProperty &l = mCaps.mLayersSupported[i];
if ( l.name == mSettings.mActiveSubLayers[0] )
{
if ( !mSettings.mActiveSubStyles[0].isEmpty() && mSettings.mActiveSubStyles[0] != "default" )
{
const QgsWmsStyleProperty *s = searchStyle( l.style, mSettings.mActiveSubStyles[0] );
if ( s )
url = pickLegend( *s );
}
else
{
// QGIS wants the default style, but GetCapabilities doesn't give us a
// way to know what is the default style. So we look for the onlineResource
// only if there is a single style available or if there is a style called "default".
if ( l.style.size() == 1 )
{
url = pickLegend( l.style[0] );
}
else
{
const QgsWmsStyleProperty *s = searchStyle( l.style, "default" );
if ( s )
url = pickLegend( *s );
}
}
break;
}
}
if ( url.isEmpty() && !mCaps.mCapabilities.capability.request.getLegendGraphic.dcpType.isEmpty() )
{
url = mCaps.mCapabilities.capability.request.getLegendGraphic.dcpType.front().http.get.onlineResource.xlinkHref;
}
return url.isEmpty() ? url : prepareUri( url );
}
bool QgsWmsProvider::addLayers()
{
QgsDebugMsg( "Entering: layers:" + mSettings.mActiveSubLayers.join( ", " ) + ", styles:" + mSettings.mActiveSubStyles.join( ", " ) );
if ( mSettings.mActiveSubLayers.size() != mSettings.mActiveSubStyles.size() )
{
QgsMessageLog::logMessage( tr( "Number of layers and styles don't match" ), tr( "WMS" ) );
return false;
}
// Set the visibility of these new layers on by default
Q_FOREACH ( const QString &layer, mSettings.mActiveSubLayers )
{
mActiveSubLayerVisibility[ layer ] = true;
QgsDebugMsg( "set visibility of layer '" + layer + "' to true." );
}
// now that the layers have changed, the extent will as well.
mExtentDirty = true;
if ( mSettings.mTiled )
mTileLayer = nullptr;
QgsDebugMsg( "Exiting." );
return true;
}
void QgsWmsProvider::setConnectionName( QString const &connName )
{
mConnectionName = connName;
}
void QgsWmsProvider::setLayerOrder( QStringList const &layers )
{
QgsDebugMsg( "Entering." );
if ( layers.size() != mSettings.mActiveSubLayers.size() )
{
QgsDebugMsg( "Invalid layer list length" );
return;
}
QMap<QString, QString> styleMap;
for ( int i = 0; i < mSettings.mActiveSubLayers.size(); i++ )
{
styleMap.insert( mSettings.mActiveSubLayers[i], mSettings.mActiveSubStyles[i] );
}
for ( int i = 0; i < layers.size(); i++ )
{
if ( !styleMap.contains( layers[i] ) )
{
QgsDebugMsg( QString( "Layer %1 not found" ).arg( layers[i] ) );
return;
}
}
mSettings.mActiveSubLayers = layers;
mSettings.mActiveSubStyles.clear();
for ( int i = 0; i < layers.size(); i++ )
{
mSettings.mActiveSubStyles.append( styleMap[ layers[i] ] );
}
QgsDebugMsg( "Exiting." );
}
void QgsWmsProvider::setSubLayerVisibility( QString const & name, bool vis )
{
if ( !mActiveSubLayerVisibility.contains( name ) )
{
QgsDebugMsg( QString( "Layer %1 not found." ).arg( name ) );
return;
}
mActiveSubLayerVisibility[name] = vis;
}
bool QgsWmsProvider::setImageCrs( QString const & crs )
{
QgsDebugMsg( "Setting image CRS to " + crs + '.' );
if ( crs != mImageCrs && !crs.isEmpty() )
{
mExtentDirty = true;
mImageCrs = crs;
}
if ( mSettings.mTiled )
{
if ( mSettings.mActiveSubLayers.size() != 1 )
{
appendError( ERR( tr( "Number of tile layers must be one" ) ) );
return false;
}
QgsDebugMsg( QString( "mTileLayersSupported.size() = %1" ).arg( mCaps.mTileLayersSupported.size() ) );
if ( mCaps.mTileLayersSupported.isEmpty() )
{
appendError( ERR( tr( "Tile layer not found" ) ) );
return false;
}
for ( int i = 0; i < mCaps.mTileLayersSupported.size(); i++ )
{
QgsWmtsTileLayer *tl = &mCaps.mTileLayersSupported[i];
if ( tl->identifier != mSettings.mActiveSubLayers[0] )
continue;
if ( mSettings.mTileMatrixSetId.isEmpty() && tl->setLinks.size() == 1 )
{
QString tms = tl->setLinks.keys()[0];
if ( !mCaps.mTileMatrixSets.contains( tms ) )
{
QgsDebugMsg( QString( "tile matrix set '%1' not found." ).arg( tms ) );
continue;
}
if ( mCaps.mTileMatrixSets[ tms ].crs != mImageCrs )
{
QgsDebugMsg( QString( "tile matrix set '%1' has crs %2 instead of %3." ).arg( tms, mCaps.mTileMatrixSets[ tms ].crs, mImageCrs ) );
continue;
}
// fill in generate matrix for WMS-C
mSettings.mTileMatrixSetId = tms;
}
mTileLayer = tl;
break;
}
QList<QVariant> resolutions;
if ( mCaps.mTileMatrixSets.contains( mSettings.mTileMatrixSetId ) )
{
mTileMatrixSet = &mCaps.mTileMatrixSets[ mSettings.mTileMatrixSetId ];
QList<double> keys = mTileMatrixSet->tileMatrices.keys();
qSort( keys );
Q_FOREACH ( double key, keys )
{
resolutions << key;
}
if ( !mTileMatrixSet->tileMatrices.empty() )
{
setProperty( "tileWidth", mTileMatrixSet->tileMatrices.values().first().tileWidth );
setProperty( "tileHeight", mTileMatrixSet->tileMatrices.values().first().tileHeight );
}
}
else
{
QgsDebugMsg( QString( "Expected tile matrix set '%1' not found." ).arg( mSettings.mTileMatrixSetId ) );
mTileMatrixSet = nullptr;
}
setProperty( "resolutions", resolutions );
if ( !mTileLayer || !mTileMatrixSet )
{
appendError( ERR( tr( "Tile layer or tile matrix set not found" ) ) );
return false;
}
}
return true;
}
void QgsWmsProvider::setQueryItem( QUrl &url, const QString& item, const QString& value )
{
url.removeQueryItem( item );
url.addQueryItem( item, value );
}
void QgsWmsProvider::setFormatQueryItem( QUrl &url )
{
url.removeQueryItem( "FORMAT" );
if ( mSettings.mImageMimeType.contains( '+' ) )
{
QString format( mSettings.mImageMimeType );
format.replace( '+', "%2b" );
url.addEncodedQueryItem( "FORMAT", format.toUtf8() );
}
else
setQueryItem( url, "FORMAT", mSettings.mImageMimeType );
}
QImage *QgsWmsProvider::draw( QgsRectangle const &viewExtent, int pixelWidth, int pixelHeight )
{
return draw( viewExtent, pixelWidth, pixelHeight, nullptr );
}
static bool _fuzzyContainsRect( const QRectF& r1, const QRectF& r2 )
{
double significantDigits = log10( qMax( r1.width(), r1.height() ) );
double epsilon = pow( 10.0, significantDigits - 5 ); // floats have 6-9 significant digits
return r1.contains( r2.adjusted( epsilon, epsilon, -epsilon, -epsilon ) );
}
void QgsWmsProvider::fetchOtherResTiles( QgsTileMode tileMode, const QgsRectangle& viewExtent, int imageWidth, QList<QRectF>& missingRects, double tres, int resOffset, QList<TileImage>& otherResTiles )
{
const QgsWmtsTileMatrix* tmOther = mTileMatrixSet->findOtherResolution( tres, resOffset );
if ( !tmOther )
return;
QSet<TilePosition> tilesSet;
Q_FOREACH ( const QRectF& missingTileRect, missingRects )
{
int c0, r0, c1, r1;
tmOther->viewExtentIntersection( QgsRectangle( missingTileRect ), nullptr, c0, r0, c1, r1 );
for ( int row = r0; row <= r1; row++ )
{
for ( int col = c0; col <= c1; col++ )
{
tilesSet << TilePosition( row, col );
}
}
}
// get URLs of tiles because their URLs are used as keys in the tile cache
TilePositions tiles = tilesSet.toList();
TileRequests requests;
switch ( tileMode )
{
case WMSC:
createTileRequestsWMSC( tmOther, tiles, requests );
break;
case WMTS:
createTileRequestsWMTS( tmOther, tiles, requests );
break;
case XYZ:
createTileRequestsXYZ( tmOther, tiles, requests );
break;
}
QList<QRectF> missingRectsToDelete;
Q_FOREACH ( const TileRequest& r, requests )
{
QImage localImage;
if ( ! QgsTileCache::tile( r.url, localImage ) )
continue;
double cr = viewExtent.width() / imageWidth;
QRectF dst(( r.rect.left() - viewExtent.xMinimum() ) / cr,
( viewExtent.yMaximum() - r.rect.bottom() ) / cr,
r.rect.width() / cr,
r.rect.height() / cr );
otherResTiles << TileImage( dst, localImage );
// see if there are any missing rects that are completely covered by this tile
Q_FOREACH ( const QRectF& missingRect, missingRects )
{
// we need to do a fuzzy "contains" check because the coordinates may not align perfectly
// due to numerical errors and/or transform of coords from double to floats
if ( _fuzzyContainsRect( r.rect, missingRect ) )
{
missingRectsToDelete << missingRect;
}
}
}
// remove all the rectangles we have completely covered by tiles from this resolution
// so we will not use tiles from multiple resolutions for one missing tile (to save time)
Q_FOREACH ( const QRectF& rectToDelete, missingRectsToDelete )
{
missingRects.removeOne( rectToDelete );
}
QgsDebugMsg( QString( "Other resolution tiles: offset %1, res %2, missing rects %3, remaining rects %4, added tiles %5" )
.arg( resOffset )
.arg( tmOther->tres )
.arg( missingRects.count() + missingRectsToDelete.count() )
.arg( missingRects.count() )
.arg( otherResTiles.count() ) );
}
uint qHash( const QgsWmsProvider::TilePosition& tp )
{
return ( uint ) tp.col + (( uint ) tp.row << 16 );
}
static void _drawDebugRect( QPainter& p, const QRectF& rect, const QColor& color )
{
#if 0 // good for debugging how tiles from various resolutions are used
QPainter::CompositionMode oldMode = p.compositionMode();
p.setCompositionMode( QPainter::CompositionMode_SourceOver );
QColor c = color;
c.setAlpha( 100 );
p.fillRect( rect, QBrush( c, Qt::DiagCrossPattern ) );
p.setCompositionMode( oldMode );
#else
Q_UNUSED( p );
Q_UNUSED( rect );
Q_UNUSED( color );
#endif
}
QImage *QgsWmsProvider::draw( QgsRectangle const & viewExtent, int pixelWidth, int pixelHeight, QgsRasterBlockFeedback* feedback )
{
QgsDebugMsg( "Entering." );
// compose the URL query string for the WMS server.
QImage* image = new QImage( pixelWidth, pixelHeight, QImage::Format_ARGB32 );
image->fill( 0 );
if ( !mSettings.mTiled && mSettings.mMaxWidth == 0 && mSettings.mMaxHeight == 0 )
{
QUrl url = createRequestUrlWMS( viewExtent, pixelWidth, pixelHeight );
// cache some details for if the user wants to do an identifyAsHtml() later
emit statusChanged( tr( "Getting map via WMS." ) );
QgsWmsImageDownloadHandler handler( dataSourceUri(), url, mSettings.authorization(), image, feedback );
handler.downloadBlocking();
}
else
{
mTileReqNo++;
double vres = viewExtent.width() / pixelWidth;
const QgsWmtsTileMatrix *tm = nullptr;
QScopedPointer<QgsWmtsTileMatrix> tempTm;
enum QgsTileMode tileMode;
if ( mSettings.mTiled )
{
Q_ASSERT( mTileLayer );
Q_ASSERT( mTileMatrixSet );
Q_ASSERT( !mTileMatrixSet->tileMatrices.isEmpty() );
// find nearest resolution
tm = mTileMatrixSet->findNearestResolution( vres );
Q_ASSERT( tm );
tileMode = mTileLayer->tileMode;
}
else if ( mSettings.mMaxWidth != 0 && mSettings.mMaxHeight != 0 )
{
tempTm.reset( new QgsWmtsTileMatrix );
tempTm->topLeft = QgsPoint( mLayerExtent.xMinimum(), mLayerExtent.yMaximum() );
tempTm->tileWidth = mSettings.mMaxWidth;
tempTm->tileHeight = mSettings.mMaxHeight;
tempTm->matrixWidth = ceil( mLayerExtent.width() / mSettings.mMaxWidth / vres );
tempTm->matrixHeight = ceil( mLayerExtent.height() / mSettings.mMaxHeight / vres );
tempTm->tres = vres;
tm = tempTm.data();
tileMode = WMSC;
}
else
{
QgsDebugMsg( "empty tile size" );
return image;
}
QgsDebugMsg( QString( "layer extent: %1,%2 %3x%4" )
.arg( qgsDoubleToString( mLayerExtent.xMinimum() ),
qgsDoubleToString( mLayerExtent.yMinimum() ) )
.arg( mLayerExtent.width() )
.arg( mLayerExtent.height() )
);
QgsDebugMsg( QString( "view extent: %1,%2 %3x%4 res:%5" )
.arg( qgsDoubleToString( viewExtent.xMinimum() ),
qgsDoubleToString( viewExtent.yMinimum() ) )
.arg( viewExtent.width() )
.arg( viewExtent.height() )
.arg( vres, 0, 'f' )
);
QgsDebugMsg( QString( "tile matrix %1,%2 res:%3 tilesize:%4x%5 matrixsize:%6x%7 id:%8" )
.arg( tm->topLeft.x() ).arg( tm->topLeft.y() ).arg( tm->tres )
.arg( tm->tileWidth ).arg( tm->tileHeight )
.arg( tm->matrixWidth ).arg( tm->matrixHeight )
.arg( tm->identifier )
);
const QgsWmtsTileMatrixLimits *tml = nullptr;
if ( mTileLayer &&
mTileLayer->setLinks.contains( mTileMatrixSet->identifier ) &&
mTileLayer->setLinks[ mTileMatrixSet->identifier ].limits.contains( tm->identifier ) )
{
tml = &mTileLayer->setLinks[ mTileMatrixSet->identifier ].limits[ tm->identifier ];
}
// calculate tile coordinates
int col0, col1, row0, row1;
tm->viewExtentIntersection( viewExtent, tml, col0, row0, col1, row1 );
#if QGISDEBUG
int n = ( col1 - col0 + 1 ) * ( row1 - row0 + 1 );
QgsDebugMsg( QString( "tile number: %1x%2 = %3" ).arg( col1 - col0 + 1 ).arg( row1 - row0 + 1 ).arg( n ) );
if ( n > 256 )
{
emit statusChanged( QString( "current view would need %1 tiles. tile request per draw limited to 256." ).arg( n ) );
return image;
}
#endif
TilePositions tiles;
for ( int row = row0; row <= row1; row++ )
{
for ( int col = col0; col <= col1; col++ )
{
tiles << TilePosition( row, col );
}
}
TileRequests requests;
switch ( tileMode )
{
case WMSC:
createTileRequestsWMSC( tm, tiles, requests );
break;
case WMTS:
createTileRequestsWMTS( tm, tiles, requests );
break;
case XYZ:
createTileRequestsXYZ( tm, tiles, requests );
break;
default:
QgsDebugMsg( QString( "unexpected tile mode %1" ).arg( mTileLayer->tileMode ) );
return image;
}
emit statusChanged( tr( "Getting tiles." ) );
QList<TileImage> tileImages; // in the correct resolution
QList<QRectF> missing; // rectangles (in map coords) of missing tiles for this view
QTime t;
t.start();
TileRequests requestsFinal;
Q_FOREACH ( const TileRequest& r, requests )
{
QImage localImage;
if ( QgsTileCache::tile( r.url, localImage ) )
{
double cr = viewExtent.width() / image->width();
QRectF dst(( r.rect.left() - viewExtent.xMinimum() ) / cr,
( viewExtent.yMaximum() - r.rect.bottom() ) / cr,
r.rect.width() / cr,
r.rect.height() / cr );
tileImages << TileImage( dst, localImage );
}
else
{
missing << r.rect;
// need to make a request
requestsFinal << r;
}
}
int t0 = t.elapsed();
// draw other res tiles if preview
QPainter p( image );
if ( feedback && feedback->isPreviewOnly() && missing.count() > 0 )
{
// some tiles are still missing, so let's see if we have any cached tiles
// from lower or higher resolution available to give the user a bit of context
// while loading the right resolution
p.setCompositionMode( QPainter::CompositionMode_Source );
#if 0 // for debugging
p.fillRect( image->rect(), QBrush( Qt::lightGray, Qt::CrossPattern ) );
#endif
p.setRenderHint( QPainter::SmoothPixmapTransform, false ); // let's not waste time with bilinear filtering
QList<TileImage> lowerResTiles, lowerResTiles2, higherResTiles;
// first we check lower resolution tiles: one level back, then two levels back (if there is still some are not covered),
// finally (in the worst case we use one level higher resolution tiles). This heuristic should give
// good overviews while not spending too much time drawing cached tiles from resolutions far away.
fetchOtherResTiles( tileMode, viewExtent, image->width(), missing, tm->tres, 1, lowerResTiles );
fetchOtherResTiles( tileMode, viewExtent, image->width(), missing, tm->tres, 2, lowerResTiles2 );
fetchOtherResTiles( tileMode, viewExtent, image->width(), missing, tm->tres, -1, higherResTiles );
// draw the cached tiles lowest to highest resolution
Q_FOREACH ( const TileImage& ti, lowerResTiles2 )
{
p.drawImage( ti.rect, ti.img );
_drawDebugRect( p, ti.rect, Qt::blue );
}
Q_FOREACH ( const TileImage& ti, lowerResTiles )
{
p.drawImage( ti.rect, ti.img );
_drawDebugRect( p, ti.rect, Qt::yellow );
}
Q_FOREACH ( const TileImage& ti, higherResTiles )
{
p.drawImage( ti.rect, ti.img );
_drawDebugRect( p, ti.rect, Qt::red );
}
}
int t1 = t.elapsed() - t0;
// draw composite in this resolution
Q_FOREACH ( const TileImage& ti, tileImages )
{
if ( mSettings.mSmoothPixmapTransform )
p.setRenderHint( QPainter::SmoothPixmapTransform, true );
p.drawImage( ti.rect, ti.img );
if ( feedback && feedback->isPreviewOnly() )
_drawDebugRect( p, ti.rect, Qt::green );
}
p.end();
int t2 = t.elapsed() - t1;
Q_UNUSED( t2 ); // only used in debug build
if ( feedback && feedback->isPreviewOnly() )
{
QgsDebugMsg( QString( "PREVIEW - CACHED: %1 / MISSING: %2" ).arg( tileImages.count() ).arg( requests.count() - tileImages.count() ) );
QgsDebugMsg( QString( "PREVIEW - TIME: this res %1 ms | other res %2 ms | TOTAL %3 ms" ).arg( t0 + t2 ).arg( t1 ).arg( t0 + t1 + t2 ) );
}
else if ( !requestsFinal.isEmpty() )
{
// let the feedback object know about the tiles we have already
if ( feedback && feedback->renderPartialOutput() )
feedback->onNewData();
// order tile requests according to the distance from view center
LessThanTileRequest cmp;
cmp.center = viewExtent.center();
qSort( requestsFinal.begin(), requestsFinal.end(), cmp );
QgsWmsTiledImageDownloadHandler handler( dataSourceUri(), mSettings.authorization(), mTileReqNo, requestsFinal, image, viewExtent, mSettings.mSmoothPixmapTransform, feedback );
handler.downloadBlocking();
}
QgsDebugMsg( QString( "TILE CACHE total: %1 / %2" ).arg( QgsTileCache::totalCost() ).arg( QgsTileCache::maxCost() ) );
#if 0
const QgsWmsStatistics::Stat& stat = QgsWmsStatistics::statForUri( dataSourceUri() );
emit statusChanged( tr( "%n tile requests in background", "tile request count", requests.count() )
+ tr( ", %n cache hits", "tile cache hits", stat.cacheHits )
+ tr( ", %n cache misses.", "tile cache missed", stat.cacheMisses )
+ tr( ", %n errors.", "errors", stat.errors )
);
#endif
}
return image;
}
void QgsWmsProvider::readBlock( int bandNo, QgsRectangle const & viewExtent, int pixelWidth, int pixelHeight, void *block, QgsRasterBlockFeedback* feedback )
{
Q_UNUSED( bandNo );
// TODO: optimize to avoid writing to QImage
QImage *image = draw( viewExtent, pixelWidth, pixelHeight, feedback );
if ( !image ) // should not happen
{
QgsMessageLog::logMessage( tr( "image is NULL" ), tr( "WMS" ) );
return;
}
QgsDebugMsg( QString( "image height = %1 bytesPerLine = %2" ).arg( image->height() ) . arg( image->bytesPerLine() ) );
size_t myExpectedSize = pixelWidth * pixelHeight * 4;
size_t myImageSize = image->height() * image->bytesPerLine();
if ( myExpectedSize != myImageSize ) // should not happen
{
QgsMessageLog::logMessage( tr( "unexpected image size" ), tr( "WMS" ) );
delete image;
return;
}
uchar * ptr = image->bits();
if ( ptr )
{
// If image is too large, ptr can be NULL
memcpy( block, ptr, myExpectedSize );
}
delete image;
}
QUrl QgsWmsProvider::createRequestUrlWMS( const QgsRectangle& viewExtent, int pixelWidth, int pixelHeight )
{
// Calculate active layers that are also visible.
bool changeXY = mCaps.shouldInvertAxisOrientation( mImageCrs );
QgsDebugMsg( "Active layer list of " + mSettings.mActiveSubLayers.join( ", " )
+ " and style list of " + mSettings.mActiveSubStyles.join( ", " ) );
QStringList visibleLayers = QStringList();
QStringList visibleStyles = QStringList();
QStringList::const_iterator it2 = mSettings.mActiveSubStyles.constBegin();
for ( QStringList::const_iterator it = mSettings.mActiveSubLayers.constBegin();
it != mSettings.mActiveSubLayers.constEnd();
++it )
{
if ( mActiveSubLayerVisibility.constFind( *it ).value() )
{
visibleLayers += *it;
visibleStyles += *it2;
}
++it2;
}
QString layers = visibleLayers.join( "," );
layers = layers.isNull() ? "" : layers;
QString styles = visibleStyles.join( "," );
styles = styles.isNull() ? "" : styles;
QgsDebugMsg( "Visible layer list of " + layers + " and style list of " + styles );
QString bbox = toParamValue( viewExtent, changeXY );
QUrl url( mSettings.mIgnoreGetMapUrl ? mSettings.mBaseUrl : getMapUrl() );
setQueryItem( url, "SERVICE", "WMS" );
setQueryItem( url, "VERSION", mCaps.mCapabilities.version );
setQueryItem( url, "REQUEST", "GetMap" );
setQueryItem( url, "BBOX", bbox );
setSRSQueryItem( url );
setQueryItem( url, "WIDTH", QString::number( pixelWidth ) );
setQueryItem( url, "HEIGHT", QString::number( pixelHeight ) );
setQueryItem( url, "LAYERS", layers );
setQueryItem( url, "STYLES", styles );
setFormatQueryItem( url );
if ( mDpi != -1 )
{
if ( mSettings.mDpiMode & dpiQGIS )
setQueryItem( url, "DPI", QString::number( mDpi ) );
if ( mSettings.mDpiMode & dpiUMN )
setQueryItem( url, "MAP_RESOLUTION", QString::number( mDpi ) );
if ( mSettings.mDpiMode & dpiGeoServer )
setQueryItem( url, "FORMAT_OPTIONS", QString( "dpi:%1" ).arg( mDpi ) );
}
//MH: jpeg does not support transparency and some servers complain if jpg and transparent=true
if ( mSettings.mImageMimeType == "image/x-jpegorpng" ||
( !mSettings.mImageMimeType.contains( "jpeg", Qt::CaseInsensitive ) &&
!mSettings.mImageMimeType.contains( "jpg", Qt::CaseInsensitive ) ) )
{
setQueryItem( url, "TRANSPARENT", "TRUE" ); // some servers giving error for 'true' (lowercase)
}
QgsDebugMsg( QString( "getmap: %1" ).arg( url.toString() ) );
return url;
}
void QgsWmsProvider::createTileRequestsWMSC( const QgsWmtsTileMatrix* tm, const QgsWmsProvider::TilePositions& tiles, QgsWmsProvider::TileRequests& requests )
{
bool changeXY = mCaps.shouldInvertAxisOrientation( mImageCrs );
// add WMS request
QUrl url( mSettings.mIgnoreGetMapUrl ? mSettings.mBaseUrl : getMapUrl() );
setQueryItem( url, "SERVICE", "WMS" );
setQueryItem( url, "VERSION", mCaps.mCapabilities.version );
setQueryItem( url, "REQUEST", "GetMap" );
setQueryItem( url, "LAYERS", mSettings.mActiveSubLayers.join( "," ) );
setQueryItem( url, "STYLES", mSettings.mActiveSubStyles.join( "," ) );
setQueryItem( url, "WIDTH", QString::number( tm->tileWidth ) );
setQueryItem( url, "HEIGHT", QString::number( tm->tileHeight ) );
setFormatQueryItem( url );
setSRSQueryItem( url );
if ( mSettings.mTiled )
{
setQueryItem( url, "TILED", "true" );
}
if ( mDpi != -1 )
{
if ( mSettings.mDpiMode & dpiQGIS )
setQueryItem( url, "DPI", QString::number( mDpi ) );