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qgsosgearthtilesource.cpp
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qgsosgearthtilesource.cpp
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/***************************************************************************
qgsosgearthtilesource.cpp
---------------------
begin : August 2010
copyright : (C) 2010 by Pirmin Kalberer
email : pka at sourcepole dot ch
***************************************************************************
* *
* 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 <osgEarth/TileSource>
#include <osgEarth/Registry>
#include <osgEarth/ImageUtils>
#include <osg/Notify>
#include <osgDB/FileNameUtils>
#include <osgDB/FileUtils>
#include <osgDB/Registry>
#include <osgDB/ReadFile>
#include <osgDB/WriteFile>
#include "qgsosgearthtilesource.h"
#include <qgsapplication.h>
#include <qgslogger.h>
#include <qgisinterface.h>
#include <qgsmapcanvas.h>
#ifdef USE_RENDERER
#include <qgsmaprenderer.h>
#else
#include <qgsmaprendererjob.h>
#endif
#include <QFile>
#include <QImage>
#include <QDesktopWidget>
using namespace osgEarth;
using namespace osgEarth::Drivers;
QgsOsgEarthTileSource::QgsOsgEarthTileSource( QgisInterface* theQgisInterface, const TileSourceOptions& options )
: TileSource( options )
, mQGisIface( theQgisInterface )
, mCoordTransform( 0 )
#ifdef USE_RENDERER
, mMapRenderer( 0 )
#endif
{
}
void QgsOsgEarthTileSource::initialize( const std::string& referenceURI, const Profile* overrideProfile )
{
Q_UNUSED( referenceURI );
Q_UNUSED( overrideProfile );
setProfile( osgEarth::Registry::instance()->getGlobalGeodeticProfile() );
QgsCoordinateReferenceSystem destCRS;
destCRS.createFromOgcWmsCrs( GEO_EPSG_CRS_AUTHID );
QgsMapCanvas *c = mQGisIface->mapCanvas();
if ( c->mapSettings().destinationCrs().authid().compare( GEO_EPSG_CRS_AUTHID, Qt::CaseInsensitive ) != 0 )
{
// FIXME: crs from canvas or first layer?
QgsCoordinateReferenceSystem srcCRS( c->mapSettings().destinationCrs() );
QgsDebugMsg( QString( "transforming from %1 to %2" ).arg( srcCRS.authid() ).arg( destCRS.authid() ) );
mCoordTransform = new QgsCoordinateTransform( srcCRS, destCRS );
}
else
{
mCoordTransform = 0;
}
#ifdef USE_RENDERER
mMapRenderer = new QgsMapRenderer();
mMapRenderer->setDestinationCrs( destCRS );
mMapRenderer->setProjectionsEnabled( true );
mMapRenderer->setOutputUnits( c->mapRenderer()->outputUnits() );
mMapRenderer->setMapUnits( QGis::Degrees );
#else
mMapSettings.setDestinationCrs( destCRS );
mMapSettings.setCrsTransformEnabled( true );
mMapSettings.setMapUnits( QGis::Degrees );
#endif
}
osg::Image* QgsOsgEarthTileSource::createImage( const TileKey& key, ProgressCallback* progress )
{
QString kname = key.str().c_str();
kname.replace( '/', '_' );
Q_UNUSED( progress );
//Get the extents of the tile
int tileSize = getPixelsPerTile();
if ( tileSize <= 0 )
{
QgsDebugMsg( "Tile size too small." );
return ImageUtils::createEmptyImage();
}
QgsRectangle viewExtent = mQGisIface->mapCanvas()->fullExtent();
if ( mCoordTransform )
{
QgsDebugMsg( QString( "vext0:%1" ).arg( viewExtent.toString( 5 ) ) );
viewExtent = mCoordTransform->transformBoundingBox( viewExtent );
}
QgsDebugMsg( QString( "vext1:%1" ).arg( viewExtent.toString( 5 ) ) );
double xmin, ymin, xmax, ymax;
key.getExtent().getBounds( xmin, ymin, xmax, ymax );
QgsRectangle tileExtent( xmin, ymin, xmax, ymax );
QgsDebugMsg( QString( "text0:%1" ).arg( tileExtent.toString( 5 ) ) );
if ( !viewExtent.intersects( tileExtent ) )
{
QgsDebugMsg( QString( "earth tile key:%1 ext:%2: NO INTERSECT" ).arg( kname ).arg( tileExtent.toString( 5 ) ) );
return ImageUtils::createEmptyImage();
}
#ifdef USE_RENDERER
QImage *qImage = createQImage( tileSize, tileSize );
if ( !qImage )
{
QgsDebugMsg( QString( "earth tile key:%1 ext:%2: EMPTY IMAGE" ).arg( kname ).arg( tileExtent.toString( 5 ) ) );
return ImageUtils::createEmptyImage();
}
mMapRenderer->setLayerSet( mQGisIface->mapCanvas()->mapRenderer()->layerSet() );
mMapRenderer->setOutputSize( QSize( tileSize, tileSize ), qImage->logicalDpiX() );
mMapRenderer->setExtent( tileExtent );
QPainter thePainter( qImage );
mMapRenderer->render( &thePainter );
#else
mMapSettings.setLayers( mQGisIface->mapCanvas()->mapSettings().layers() );
mMapSettings.setOutputSize( QSize( tileSize, tileSize ) );
mMapSettings.setOutputDpi( QgsApplication::desktop()->logicalDpiX() );
mMapSettings.setExtent( tileExtent );
mMapSettings.setBackgroundColor( QColor( 0, 0, 0, 0 ) );
QgsMapRendererSequentialJob job( mMapSettings );
job.start();
job.waitForFinished();
QImage *qImage = new QImage( job.renderedImage() );
if ( !qImage )
{
QgsDebugMsg( QString( "earth tile key:%1 ext:%2: EMPTY IMAGE" ).arg( kname ).arg( tileExtent.toString( 5 ) ) );
return ImageUtils::createEmptyImage();
}
Q_ASSERT( qImage->logicalDpiX() == QgsApplication::desktop()->logicalDpiX() );
Q_ASSERT( qImage->format() == QImage::Format_ARGB32_Premultiplied );
#endif
QgsDebugMsg( QString( "earth tile key:%1 ext:%2" ).arg( kname ).arg( tileExtent.toString( 5 ) ) );
#if 0
qImage->save( QString( "/tmp/tile-%1.png" ).arg( kname ) );
#endif
osg::ref_ptr<osg::Image> image = new osg::Image;
//The pixel format is always RGBA to support transparency
image->setImage( tileSize, tileSize, 1, 4, // width, height, depth, pixelFormat?
GL_BGRA, GL_UNSIGNED_BYTE, //Why not GL_RGBA - Qt bug?
qImage->bits(),
osg::Image::NO_DELETE, 1 );
image->flipVertical();
//Create a transparent image if we don't have an image
if ( !image.valid() )
{
QgsDebugMsg( "image is invalid" );
return ImageUtils::createEmptyImage();
}
QgsDebugMsg( "returning image" );
return image.release();
}
QImage* QgsOsgEarthTileSource::createQImage( int width, int height ) const
{
if ( width < 0 || height < 0 )
return 0;
QImage *qImage = 0;
//is format jpeg?
bool jpeg = false;
//transparent parameter
bool transparent = true;
//use alpha channel only if necessary because it slows down performance
if ( transparent && !jpeg )
{
qImage = new QImage( width, height, QImage::Format_ARGB32_Premultiplied );
qImage->fill( 0 );
}
else
{
qImage = new QImage( width, height, QImage::Format_RGB32 );
qImage->fill( qRgb( 255, 255, 255 ) );
}
if ( !qImage )
return 0;
//apply DPI parameter if present.
#if 0
int dpm = dpi / 0.0254;
qImage->setDotsPerMeterX( dpm );
qImage->setDotsPerMeterY( dpm );
#endif
return qImage;
}