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qgsimagewarper.cpp
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qgsimagewarper.cpp
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/***************************************************************************
qgsimagewarper.cpp
--------------------------------------
Date : Sun Sep 16 12:03:14 AKDT 2007
Copyright : (C) 2007 by Gary E. Sherman
Email : sherman at mrcc 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. *
* *
***************************************************************************/
/* $Id$ */
#include <cmath>
#include <iostream>
#include <cstdio>
#include <assert.h>
#include <cpl_conv.h>
#include <cpl_string.h>
#include <gdal.h>
#include <gdalwarper.h>
#include <ogr_spatialref.h>
#include <QFile>
#include <QProgressDialog>
#include "qgsimagewarper.h"
#include "qgsgeoreftransform.h"
#if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM >= 1800
#define TO8F(x) (x).toUtf8().constData()
#else
#define TO8F(x) QFile::encodeName( x ).constData()
#endif
bool QgsImageWarper::mWarpCanceled = false;
QgsImageWarper::QgsImageWarper( QWidget *theParent )
: mParent( theParent )
{
}
bool QgsImageWarper::openSrcDSAndGetWarpOpt( const QString &input, const ResamplingMethod &resampling,
const GDALTransformerFunc &pfnTransform,
GDALDatasetH &hSrcDS, GDALWarpOptions *&psWarpOptions )
{
// Open input file
GDALAllRegister();
hSrcDS = GDALOpen( TO8F( input ), GA_ReadOnly );
if ( hSrcDS == NULL ) return false;
// Setup warp options.
psWarpOptions = GDALCreateWarpOptions();
psWarpOptions->hSrcDS = hSrcDS;
psWarpOptions->nBandCount = GDALGetRasterCount( hSrcDS );
psWarpOptions->panSrcBands =
( int * ) CPLMalloc( sizeof( int ) * psWarpOptions->nBandCount );
psWarpOptions->panDstBands =
( int * ) CPLMalloc( sizeof( int ) * psWarpOptions->nBandCount );
for ( int i = 0; i < psWarpOptions->nBandCount; ++i )
{
psWarpOptions->panSrcBands[i] = i + 1;
psWarpOptions->panDstBands[i] = i + 1;
}
psWarpOptions->pfnProgress = GDALTermProgress;
psWarpOptions->pfnTransformer = pfnTransform;
psWarpOptions->eResampleAlg = GDALResampleAlg( resampling );
return true;
}
bool QgsImageWarper::createDestinationDataset(
const QString &outputName, GDALDatasetH hSrcDS, GDALDatasetH &hDstDS,
uint resX, uint resY, double *adfGeoTransform, bool useZeroAsTrans,
const QString& compression, const QString &projection )
{
// create the output file
GDALDriverH driver = GDALGetDriverByName( "GTiff" );
if ( driver == NULL )
{
return false;
}
char **papszOptions = NULL;
papszOptions = CSLSetNameValue( papszOptions, "COMPRESS", compression.toAscii() );
hDstDS = GDALCreate( driver,
QFile::encodeName( outputName ).constData(), resX, resY,
GDALGetRasterCount( hSrcDS ),
GDALGetRasterDataType( GDALGetRasterBand( hSrcDS, 1 ) ),
papszOptions );
if ( hDstDS == NULL )
{
return false;
}
if ( CE_None != GDALSetGeoTransform( hDstDS, adfGeoTransform ) )
{
return false;
}
if ( !projection.isEmpty() )
{
OGRSpatialReference oTargetSRS;
if ( projection.startsWith( "EPSG", Qt::CaseInsensitive ) )
{
QString epsg = projection.mid( projection.indexOf( ":" ) + 1 );
oTargetSRS.importFromEPSG( epsg.toInt() );
}
else
{
oTargetSRS.importFromProj4( projection.toLatin1().data() );
}
char *wkt = NULL;
OGRErr err = oTargetSRS.exportToWkt( &wkt );
if ( err != CE_None || GDALSetProjection( hDstDS, wkt ) != CE_None )
{
OGRFree( wkt );
return false;
}
OGRFree( wkt );
}
for ( int i = 0; i < GDALGetRasterCount( hSrcDS ); ++i )
{
GDALRasterBandH hSrcBand = GDALGetRasterBand( hSrcDS, i + 1 );
GDALRasterBandH hDstBand = GDALGetRasterBand( hDstDS, i + 1 );
GDALColorTableH cTable = GDALGetRasterColorTable( hSrcBand );
GDALSetRasterColorInterpretation( hDstBand, GDALGetRasterColorInterpretation( hSrcBand ) );
if ( cTable )
{
GDALSetRasterColorTable( hDstBand, cTable );
}
int success;
double noData = GDALGetRasterNoDataValue( hSrcBand, &success );
if ( success )
{
GDALSetRasterNoDataValue( hDstBand, noData );
}
else if ( useZeroAsTrans )
{
GDALSetRasterNoDataValue( hDstBand, 0 );
}
}
return true;
}
int QgsImageWarper::warpFile( const QString& input,
const QString& output,
const QgsGeorefTransform &georefTransform,
ResamplingMethod resampling,
bool useZeroAsTrans,
const QString& compression,
const QString &projection,
double destResX, double destResY )
{
if ( !georefTransform.parametersInitialized() )
return false;
CPLErr eErr;
GDALDatasetH hSrcDS, hDstDS;
GDALWarpOptions *psWarpOptions;
if ( !openSrcDSAndGetWarpOpt( input, resampling, georefTransform.GDALTransformer(), hSrcDS, psWarpOptions ) )
{
// TODO: be verbose about failures
return false;
}
double adfGeoTransform[6];
int destPixels, destLines;
eErr = GDALSuggestedWarpOutput( hSrcDS, georefTransform.GDALTransformer(),
georefTransform.GDALTransformerArgs(),
adfGeoTransform, &destPixels, &destLines );
if ( eErr != CE_None )
{
GDALClose( hSrcDS );
GDALDestroyWarpOptions( psWarpOptions );
return false;
}
// If specified, override the suggested resolution with user values
if ( destResX != 0.0 || destResY != 0.0 )
{
// If only one scale has been specified, fill in the other from the GDAL suggestion
if ( destResX == 0.0 ) destResX = adfGeoTransform[1];
if ( destResY == 0.0 ) destResY = adfGeoTransform[5];
// Make sure user-specified coordinate system has canonical orientation
if ( destResX < 0.0 ) destResX = -destResX;
if ( destResY > 0.0 ) destResY = -destResY;
// Assert that the north-up convention is fullfiled by GDALSuggestedWarpOutput (should always be the case)
assert( adfGeoTransform[0] > 0.0 );
assert( adfGeoTransform[5] < 0.0 );
// Find suggested output image extent (in georeferenced units)
double minX = adfGeoTransform[0];
double maxX = adfGeoTransform[0] + adfGeoTransform[1] * destPixels;
double maxY = adfGeoTransform[3];
double minY = adfGeoTransform[3] + adfGeoTransform[5] * destLines;
// Update line and pixel count to match extent at user-specified resolution
destPixels = ( int )((( maxX - minX ) / destResX ) + 0.5 );
destLines = ( int )((( minY - maxY ) / destResY ) + 0.5 );
adfGeoTransform[0] = minX;
adfGeoTransform[3] = maxY;
adfGeoTransform[1] = destResX;
adfGeoTransform[5] = destResY;
}
if ( !createDestinationDataset( output, hSrcDS, hDstDS, destPixels, destLines,
adfGeoTransform, useZeroAsTrans, compression,
projection ) )
{
GDALClose( hSrcDS );
GDALDestroyWarpOptions( psWarpOptions );
return false;
}
// Create a QT progress dialog
QProgressDialog *progressDialog = new QProgressDialog( mParent );
progressDialog->setWindowTitle( tr( "Progress indication" ) );
progressDialog->setRange( 0, 100 );
progressDialog->setAutoClose( true );
progressDialog->setModal( true );
progressDialog->setMinimumDuration( 0 );
// Set GDAL callbacks for the progress dialog
psWarpOptions->pProgressArg = createWarpProgressArg( progressDialog );
psWarpOptions->pfnProgress = updateWarpProgress;
psWarpOptions->hSrcDS = hSrcDS;
psWarpOptions->hDstDS = hDstDS;
// Create a transformer which transforms from source to destination pixels (and vice versa)
psWarpOptions->pfnTransformer = GeoToPixelTransform;
psWarpOptions->pTransformerArg = addGeoToPixelTransform( georefTransform.GDALTransformer(),
georefTransform.GDALTransformerArgs(),
adfGeoTransform );
// Initialize and execute the warp operation.
GDALWarpOperation oOperation;
oOperation.Initialize( psWarpOptions );
progressDialog->show();
progressDialog->raise();
progressDialog->activateWindow();
eErr = oOperation.ChunkAndWarpImage( 0, 0, destPixels, destLines );
// eErr = oOperation.ChunkAndWarpMulti(0, 0, destPixels, destLines);
destroyGeoToPixelTransform( psWarpOptions->pTransformerArg );
GDALDestroyWarpOptions( psWarpOptions );
delete progressDialog;
GDALClose( hSrcDS );
GDALClose( hDstDS );
return mWarpCanceled ? -1 : eErr == CE_None ? 1 : 0;
}
void *QgsImageWarper::addGeoToPixelTransform( GDALTransformerFunc GDALTransformer, void *GDALTransformerArg, double *padfGeotransform ) const
{
TransformChain *chain = new TransformChain;
chain->GDALTransformer = GDALTransformer;
chain->GDALTransformerArg = GDALTransformerArg;
memcpy( chain->adfGeotransform, padfGeotransform, sizeof( double )*6 );
// TODO: In reality we don't require the full homogeneous matrix, so GeoToPixelTransform and matrix inversion could
// be optimized for simple scale+offset if there's the need (e.g. for numerical or performance reasons).
if ( !GDALInvGeoTransform( chain->adfGeotransform, chain->adfInvGeotransform ) )
{
// Error handling if inversion fails - although the inverse transform is not needed for warp operation
return NULL;
}
return ( void* )chain;
}
void QgsImageWarper::destroyGeoToPixelTransform( void *GeoToPixelTransfomArg ) const
{
delete static_cast<TransformChain *>( GeoToPixelTransfomArg );
}
int QgsImageWarper::GeoToPixelTransform( void *pTransformerArg, int bDstToSrc, int nPointCount,
double *x, double *y, double *z, int *panSuccess )
{
TransformChain *chain = static_cast<TransformChain*>( pTransformerArg );
if ( chain == NULL )
{
return false;
}
if ( !bDstToSrc )
{
// Transform to georeferenced coordinates
if ( !chain->GDALTransformer( chain->GDALTransformerArg, bDstToSrc, nPointCount, x, y, z, panSuccess ) )
{
return false;
}
// Transform from georeferenced to pixel/line
for ( int i = 0; i < nPointCount; ++i )
{
if ( !panSuccess[i] ) continue;
double xP = x[i];
double yP = y[i];
x[i] = chain->adfInvGeotransform[0] + xP * chain->adfInvGeotransform[1] + yP * chain->adfInvGeotransform[2];
y[i] = chain->adfInvGeotransform[3] + xP * chain->adfInvGeotransform[4] + yP * chain->adfInvGeotransform[5];
}
}
else
{
// Transform from pixel/line to georeferenced coordinates
for ( int i = 0; i < nPointCount; ++i )
{
double P = x[i];
double L = y[i];
x[i] = chain->adfGeotransform[0] + P * chain->adfGeotransform[1] + L * chain->adfGeotransform[2];
y[i] = chain->adfGeotransform[3] + P * chain->adfGeotransform[4] + L * chain->adfGeotransform[5];
}
// Transform from georeferenced coordinates to source pixel/line
if ( !chain->GDALTransformer( chain->GDALTransformerArg, bDstToSrc, nPointCount, x, y, z, panSuccess ) )
{
return false;
}
}
return true;
}
void *QgsImageWarper::createWarpProgressArg( QProgressDialog *progressDialog ) const
{
return ( void * )progressDialog;
}
int CPL_STDCALL QgsImageWarper::updateWarpProgress( double dfComplete, const char *pszMessage, void *pProgressArg )
{
QProgressDialog *progress = static_cast<QProgressDialog*>( pProgressArg );
progress->setValue( qMin( 100u, ( uint )( dfComplete*100.0 ) ) );
qApp->processEvents();
// TODO: call QEventLoop manually to make "cancel" button more responsive
if ( progress->wasCanceled() )
{
mWarpCanceled = true;
return false;
}
mWarpCanceled = false;
return true;
}