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qgsgdalprovider.cpp
2683 lines (2287 loc) · 89.8 KB
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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 "qgsmessagelog.h"
#include "qgsrectangle.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsrasterbandstats.h"
#include "qgsrasterlayer.h"
#include "qgsrasterpyramid.h"
#include "qgspoint.h"
#include <QImage>
#include <QSettings>
#include <QColor>
#include <QProcess>
#include <QMessageBox>
#include <QDir>
#include <QFileInfo>
#include <QFile>
#include <QHash>
#include <QTime>
#include <QSettings>
#include <QTextDocument>
#include "gdalwarper.h"
#include "ogr_spatialref.h"
#include "cpl_conv.h"
#include "cpl_string.h"
#define ERR(message) QGS_ERROR_MESSAGE(message,"GDAL provider")
static QString PROVIDER_KEY = "gdal";
static QString PROVIDER_DESCRIPTION = "GDAL provider";
struct QgsGdalProgress
{
int type;
QgsGdalProvider *provider;
};
//
// global callback function
//
int CPL_STDCALL progressCallback( double dfComplete,
const char * pszMessage,
void * pProgressArg )
{
static double dfLastComplete = -1.0;
QgsGdalProgress *prog = static_cast<QgsGdalProgress *>( pProgressArg );
QgsGdalProvider *mypProvider = prog->provider;
if ( dfLastComplete > dfComplete )
{
if ( dfLastComplete >= 1.0 )
dfLastComplete = -1.0;
else
dfLastComplete = dfComplete;
}
if ( floor( dfLastComplete*10 ) != floor( dfComplete*10 ) )
{
mypProvider->emitProgress( prog->type, dfComplete * 100, QString( pszMessage ) );
mypProvider->emitProgressUpdate( dfComplete * 100 );
}
dfLastComplete = dfComplete;
return true;
}
QgsGdalProvider::QgsGdalProvider( QString const & uri, QgsError error )
: QgsRasterDataProvider( uri )
, mValid( false )
, mGdalBaseDataset( 0 )
, mGdalDataset( 0 )
{
setError( error );
}
QgsGdalProvider::QgsGdalProvider( QString const & uri, bool update )
: QgsRasterDataProvider( uri )
, QgsGdalProviderBase()
, mUpdate( update )
, mValid( false )
, mGdalBaseDataset( 0 )
, mGdalDataset( 0 )
{
QgsDebugMsg( "constructing with uri '" + uri + "'." );
QgsGdalProviderBase::registerGdalDrivers();
// GDAL tends to open AAIGrid as Float32 which results in lost precision
// and confusing values shown to users, force Float64
CPLSetConfigOption( "AAIGRID_DATATYPE", "Float64" );
// To get buildSupportedRasterFileFilter the provider is called with empty uri
if ( uri.isEmpty() )
{
return;
}
mGdalDataset = 0;
// Try to open using VSIFileHandler (see qgsogrprovider.cpp)
QString vsiPrefix = QgsZipItem::vsiPrefix( uri );
if ( vsiPrefix != "" )
{
if ( !uri.startsWith( vsiPrefix ) )
setDataSourceUri( vsiPrefix + uri );
QgsDebugMsg( QString( "Trying %1 syntax, uri= %2" ).arg( vsiPrefix ).arg( dataSourceUri() ) );
}
QString gdalUri = dataSourceUri();
CPLErrorReset();
mGdalBaseDataset = GDALOpen( TO8F( gdalUri ), mUpdate ? GA_Update : GA_ReadOnly );
if ( !mGdalBaseDataset )
{
QString msg = QString( "Cannot open GDAL dataset %1:\n%2" ).arg( dataSourceUri() ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) );
appendError( ERR( msg ) );
return;
}
QgsDebugMsg( "GdalDataset opened" );
initBaseDataset();
}
QgsRasterInterface * QgsGdalProvider::clone() const
{
QgsDebugMsg( "Entered" );
QgsGdalProvider * provider = new QgsGdalProvider( dataSourceUri() );
return provider;
}
bool QgsGdalProvider::crsFromWkt( const char *wkt )
{
void *hCRS = OSRNewSpatialReference( NULL );
if ( OSRImportFromWkt( hCRS, ( char ** ) &wkt ) == OGRERR_NONE )
{
if ( OSRAutoIdentifyEPSG( hCRS ) == OGRERR_NONE )
{
QString authid = QString( "%1:%2" )
.arg( OSRGetAuthorityName( hCRS, NULL ) )
.arg( OSRGetAuthorityCode( hCRS, NULL ) );
QgsDebugMsg( "authid recognized as " + authid );
mCrs.createFromOgcWmsCrs( authid );
}
else
{
// get the proj4 text
char *pszProj4;
OSRExportToProj4( hCRS, &pszProj4 );
QgsDebugMsg( pszProj4 );
OGRFree( pszProj4 );
char *pszWkt = NULL;
OSRExportToWkt( hCRS, &pszWkt );
QString myWktString = QString( pszWkt );
OGRFree( pszWkt );
// create CRS from Wkt
mCrs.createFromWkt( myWktString );
}
}
OSRRelease( hCRS );
return mCrs.isValid();
}
QgsGdalProvider::~QgsGdalProvider()
{
QgsDebugMsg( "entering." );
if ( mGdalBaseDataset )
{
GDALDereferenceDataset( mGdalBaseDataset );
}
if ( mGdalDataset )
{
GDALClose( mGdalDataset );
}
}
// This was used by raster layer to reload data
void QgsGdalProvider::closeDataset()
{
if ( !mValid )
{
return;
}
mValid = false;
GDALDereferenceDataset( mGdalBaseDataset );
mGdalBaseDataset = NULL;
GDALClose( mGdalDataset );
mGdalDataset = NULL;
}
QString QgsGdalProvider::metadata()
{
QString myMetadata ;
myMetadata += QString( GDALGetDescription( GDALGetDatasetDriver( mGdalDataset ) ) );
myMetadata += "<br>";
myMetadata += QString( GDALGetMetadataItem( GDALGetDatasetDriver( mGdalDataset ), GDAL_DMD_LONGNAME, NULL ) );
// my added code (MColetti)
myMetadata += "<p class=\"glossy\">";
myMetadata += tr( "Dataset Description" );
myMetadata += "</p>\n";
myMetadata += "<p>";
myMetadata += FROM8( GDALGetDescription( mGdalDataset ) );
myMetadata += "</p>\n";
char ** GDALmetadata = GDALGetMetadata( mGdalDataset, NULL );
if ( GDALmetadata )
{
QStringList metadata = cStringList2Q_( GDALmetadata );
myMetadata += QgsRasterDataProvider::makeTableCells( metadata );
}
else
{
QgsDebugMsg( "dataset has no metadata" );
}
for ( int i = 1; i <= GDALGetRasterCount( mGdalDataset ); ++i )
{
myMetadata += "<p class=\"glossy\">" + tr( "Band %1" ).arg( i ) + "</p>\n";
GDALRasterBandH gdalBand = GDALGetRasterBand( mGdalDataset, i );
GDALmetadata = GDALGetMetadata( gdalBand, NULL );
if ( GDALmetadata )
{
QStringList metadata = cStringList2Q_( GDALmetadata );
myMetadata += QgsRasterDataProvider::makeTableCells( metadata );
}
else
{
QgsDebugMsg( "band " + QString::number( i ) + " has no metadata" );
}
char ** GDALcategories = GDALGetRasterCategoryNames( gdalBand );
if ( GDALcategories )
{
QStringList categories = cStringList2Q_( GDALcategories );
myMetadata += QgsRasterDataProvider::makeTableCells( categories );
}
else
{
QgsDebugMsg( "band " + QString::number( i ) + " has no categories" );
}
}
// end my added code
myMetadata += "<p class=\"glossy\">";
myMetadata += tr( "Dimensions:" );
myMetadata += "</p>\n";
myMetadata += "<p>";
myMetadata += tr( "X: %1 Y: %2 Bands: %3" )
.arg( GDALGetRasterXSize( mGdalDataset ) )
.arg( GDALGetRasterYSize( mGdalDataset ) )
.arg( GDALGetRasterCount( mGdalDataset ) );
myMetadata += "</p>\n";
//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 );
myMetadata += "<p>X : " + QString::number( GDALGetRasterBandXSize( myOverview ) );
myMetadata += ",Y " + QString::number( GDALGetRasterBandYSize( myOverview ) ) + "</p>";
}
}
}
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
{
myMetadata += "<p class=\"glossy\">";
myMetadata += tr( "Origin:" );
myMetadata += "</p>\n";
myMetadata += "<p>";
myMetadata += QString::number( mGeoTransform[0] );
myMetadata += ",";
myMetadata += QString::number( mGeoTransform[3] );
myMetadata += "</p>\n";
myMetadata += "<p class=\"glossy\">";
myMetadata += tr( "Pixel Size:" );
myMetadata += "</p>\n";
myMetadata += "<p>";
myMetadata += QString::number( mGeoTransform[1] );
myMetadata += ",";
myMetadata += QString::number( mGeoTransform[5] );
myMetadata += "</p>\n";
}
return myMetadata;
}
// Not supported by GDAL
QImage* QgsGdalProvider::draw( QgsRectangle const & viewExtent, int pixelWidth, int pixelHeight )
{
Q_UNUSED( viewExtent );
QgsDebugMsg( "pixelWidth = " + QString::number( pixelWidth ) );
QgsDebugMsg( "pixelHeight = " + QString::number( pixelHeight ) );
QgsDebugMsg( "viewExtent: " + viewExtent.toString() );
QImage *image = new QImage( pixelWidth, pixelHeight, QImage::Format_ARGB32 );
image->fill( QColor( Qt::gray ).rgb() );
return image;
}
QgsRasterBlock* QgsGdalProvider::block( int theBandNo, const QgsRectangle &theExtent, int theWidth, int theHeight )
{
QgsRasterBlock *block = new QgsRasterBlock( dataType( theBandNo ), theWidth, theHeight, noDataValue( theBandNo ) );
if ( block->isEmpty() )
{
return block;
}
readBlock( theBandNo, theExtent, theWidth, theHeight, block->data() );
block->applyNodataValues( userNoDataValue( theBandNo ) );
return block;
}
void QgsGdalProvider::readBlock( int theBandNo, int xBlock, int yBlock, void *block )
{
// TODO!!!: Check data alignment!!! May it happen that nearest value which
// is not nearest is assigned to an output cell???
//QgsDebugMsg( "Entered" );
//QgsDebugMsg( "yBlock = " + QString::number( yBlock ) );
GDALRasterBandH myGdalBand = GDALGetRasterBand( mGdalDataset, theBandNo );
//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[theBandNo-1], 0, 0 );
}
void QgsGdalProvider::readBlock( int theBandNo, QgsRectangle const & theExtent, int thePixelWidth, int thePixelHeight, void *theBlock )
{
QgsDebugMsg( "thePixelWidth = " + QString::number( thePixelWidth ) );
QgsDebugMsg( "thePixelHeight = " + QString::number( thePixelHeight ) );
QgsDebugMsg( "theExtent: " + theExtent.toString() );
for ( int i = 0 ; i < 6; i++ )
{
QgsDebugMsg( QString( "transform : %1" ).arg( mGeoTransform[i] ) );
}
int dataSize = dataTypeSize( theBandNo );
if ( !mExtent.contains( theExtent ) )
{
// fill with null values
QByteArray ba = QgsRasterBlock::valueBytes( dataType( theBandNo ), noDataValue( theBandNo ) );
char *nodata = ba.data();
char *block = ( char * ) theBlock;
for ( int i = 0; i < thePixelWidth * thePixelHeight; i++ )
{
memcpy( block, nodata, dataSize );
block += dataSize;
}
}
QgsRectangle myRasterExtent = theExtent.intersect( &mExtent );
if ( myRasterExtent.isEmpty() )
{
QgsDebugMsg( "draw request outside view extent." );
return;
}
QgsDebugMsg( "mExtent: " + mExtent.toString() );
QgsDebugMsg( "myRasterExtent: " + myRasterExtent.toString() );
double xRes = theExtent.width() / thePixelWidth;
double yRes = theExtent.height() / thePixelHeight;
// Find top, bottom rows and left, right column the raster extent covers
// These are limits in target grid space
int top = 0;
int bottom = thePixelHeight - 1;
int left = 0;
int right = thePixelWidth - 1;
if ( myRasterExtent.yMaximum() < theExtent.yMaximum() )
{
top = qRound(( theExtent.yMaximum() - myRasterExtent.yMaximum() ) / yRes );
}
if ( myRasterExtent.yMinimum() > theExtent.yMinimum() )
{
bottom = qRound(( theExtent.yMaximum() - myRasterExtent.yMinimum() ) / yRes ) - 1;
}
if ( myRasterExtent.xMinimum() > theExtent.xMinimum() )
{
left = qRound(( myRasterExtent.xMinimum() - theExtent.xMinimum() ) / xRes );
}
if ( myRasterExtent.xMaximum() < theExtent.xMaximum() )
{
right = qRound(( myRasterExtent.xMaximum() - theExtent.xMinimum() ) / xRes ) - 1;
}
QgsDebugMsg( QString( "top = %1 bottom = %2 left = %3 right = %4" ).arg( top ).arg( bottom ).arg( left ).arg( right ) );
// 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?
QgsDebugMsg( QString( "xRes = %1 yRes = %2 srcXRes = %3 srcYRes = %4" ).arg( xRes ).arg( yRes ).arg( srcXRes ).arg( srcYRes ) );
// 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;
QTime time;
time.start();
// Note: original approach for xRes < srcXRes || yRes < qAbs( 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. Usualy 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>( floor(( myRasterExtent.xMinimum() - mExtent.xMinimum() ) / srcXRes ) );
}
if ( mExtent.xMaximum() > myRasterExtent.xMaximum() )
{
srcRight = static_cast<int>( 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>( floor( -1. * ( mExtent.yMaximum() - myRasterExtent.yMaximum() ) / srcYRes ) );
}
if ( mExtent.yMinimum() < myRasterExtent.yMinimum() )
{
srcBottom = static_cast<int>( floor( -1. * ( mExtent.yMaximum() - myRasterExtent.yMinimum() ) / srcYRes ) );
}
QgsDebugMsg( QString( "srcTop = %1 srcBottom = %2 srcLeft = %3 srcRight = %4" ).arg( srcTop ).arg( srcBottom ).arg( srcLeft ).arg( srcRight ) );
int srcWidth = srcRight - srcLeft + 1;
int srcHeight = srcBottom - srcTop + 1;
QgsDebugMsg( QString( "width = %1 height = %2 srcWidth = %3 srcHeight = %4" ).arg( width ).arg( height ).arg( srcWidth ).arg( srcHeight ) );
int tmpWidth = srcWidth;
int tmpHeight = srcHeight;
if ( xRes > srcXRes )
{
tmpWidth = static_cast<int>( qRound( srcWidth * srcXRes / xRes ) ) ;
}
if ( yRes > fabs( srcYRes ) )
{
tmpHeight = static_cast<int>( qRound( -1.*srcHeight * srcYRes / yRes ) ) ;
}
double tmpXMin = mExtent.xMinimum() + srcLeft * srcXRes;
double tmpYMax = mExtent.yMaximum() + srcTop * srcYRes;
QgsDebugMsg( QString( "tmpXMin = %1 tmpYMax = %2 tmpWidth = %3 tmpHeight = %4" ).arg( tmpXMin ).arg( tmpYMax ).arg( tmpWidth ).arg( tmpHeight ) );
// Allocate temporary block
char *tmpBlock = ( char * )QgsMalloc( dataSize * tmpWidth * tmpHeight );
if ( ! tmpBlock )
{
QgsDebugMsg( QString( "Coudn't allocate temporary buffer of %1 bytes" ).arg( dataSize * tmpWidth * tmpHeight ) );
return;
}
GDALRasterBandH gdalBand = GDALGetRasterBand( mGdalDataset, theBandNo );
GDALDataType type = ( GDALDataType )mGdalDataType[theBandNo-1];
CPLErrorReset();
CPLErr err = GDALRasterIO( gdalBand, GF_Read,
srcLeft, srcTop, srcWidth, srcHeight,
( void * )tmpBlock,
tmpWidth, tmpHeight, type,
0, 0 );
if ( err != CPLE_None )
{
QgsLogger::warning( "RasterIO error: " + QString::fromUtf8( CPLGetLastErrorMsg() ) );
QgsFree( tmpBlock );
return;
}
QgsDebugMsg( QString( "GDALRasterIO time (ms): %1" ).arg( time.elapsed() ) );
time.start();
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>( floor( -1. * ( tmpYMax - y ) / tmpYRes ) );
char *srcRowBlock = tmpBlock + dataSize * tmpRow * tmpWidth;
char *dstRowBlock = ( char * )theBlock + dataSize * ( top + row ) * thePixelWidth;
double x = myRasterExtent.xMinimum() + 0.5 * xRes; // cell center
char* dst = dstRowBlock + dataSize * left;
char* src = 0;
int tmpCol = 0;
for ( int col = 0; col < width; ++col )
{
// floor() is quite slow! Use just cast to int.
tmpCol = static_cast<int>(( x - tmpXMin ) / tmpXRes ) ;
src = srcRowBlock + dataSize * tmpCol;
memcpy( dst, src, dataSize );
dst += dataSize;
x += xRes;
}
y -= yRes;
}
QgsFree( tmpBlock );
QgsDebugMsg( QString( "resample time (ms): %1" ).arg( time.elapsed() ) );
return;
}
//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 theBandNo, QgsRectangle const & theExtent, int thePixelWidth, int thePixelHeight, void *theBlock )
{
QgsDebugMsg( "thePixelWidth = " + QString::number( thePixelWidth ) );
QgsDebugMsg( "thePixelHeight = " + QString::number( thePixelHeight ) );
QgsDebugMsg( "theExtent: " + theExtent.toString() );
QString myMemDsn;
myMemDsn.sprintf( "DATAPOINTER = %p", theBlock );
QgsDebugMsg( myMemDsn );
//myMemDsn.sprintf( "MEM:::DATAPOINTER=%lu,PIXELS=%d,LINES=%d,BANDS=1,DATATYPE=%s,PIXELOFFSET=0,LINEOFFSET=0,BANDOFFSET=0", ( long )theBlock, thePixelWidth, thePixelHeight, GDALGetDataTypeName(( GDALDataType )mGdalDataType[theBandNo-1] ) );
char szPointer[64];
memset( szPointer, 0, sizeof( szPointer ) );
CPLPrintPointer( szPointer, theBlock, sizeof( szPointer ) );
myMemDsn.sprintf( "MEM:::DATAPOINTER=%s,PIXELS=%d,LINES=%d,BANDS=1,DATATYPE=%s,PIXELOFFSET=0,LINEOFFSET=0,BANDOFFSET=0", szPointer, thePixelWidth, thePixelHeight, GDALGetDataTypeName(( GDALDataType )mGdalDataType[theBandNo-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, theDestCRS.toWkt().toAscii().constData() );
double myMemGeoTransform[6];
myMemGeoTransform[0] = theExtent.xMinimum(); // top left x
myMemGeoTransform[1] = theExtent.width() / thePixelWidth; // w-e pixel resolution
myMemGeoTransform[2] = 0; // rotation, 0 if image is "north up"
myMemGeoTransform[3] = theExtent.yMaximum(); // top left y
myMemGeoTransform[4] = 0; // rotation, 0 if image is "north up"
myMemGeoTransform[5] = -1. * theExtent.height() / thePixelHeight; // 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] = theBandNo;
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,
NULL,
myGdalMemDataset,
NULL,
FALSE, 0.0, 1
);
#if 0
myWarpOptions->pTransformerArg =
GDALCreateGenImgProjTransformer2(
mGdalDataset,
myGdalMemDataset,
NULL
);
#endif
if ( !myWarpOptions->pTransformerArg )
{
QMessageBox::warning( 0, QObject::tr( "Warning" ),
QObject::tr( "Cannot GDALCreateGenImgProjTransformer: " )
+ QString::fromUtf8( CPLGetLastErrorMsg() ) );
return;
}
//CPLAssert( myWarpOptions->pTransformerArg != NULL );
myWarpOptions->pfnTransformer = GDALGenImgProjTransform;
myWarpOptions->padfDstNoDataReal = ( double * ) QgsMalloc( myWarpOptions->nBandCount * sizeof( double ) );
myWarpOptions->padfDstNoDataImag = ( double * ) QgsMalloc( myWarpOptions->nBandCount * sizeof( double ) );
myWarpOptions->padfDstNoDataReal[0] = mNoDataValue[theBandNo-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 inittialize GDALWarpOperation : " )
+ QString::fromUtf8( CPLGetLastErrorMsg() ) );
return;
}
CPLErrorReset();
CPLErr myErr;
myErr = myOperation.ChunkAndWarpImage( 0, 0, thePixelWidth, thePixelHeight );
if ( myErr != CPLE_None )
{
QMessageBox::warning( 0, QObject::tr( "Warning" ),
QObject::tr( "Cannot ChunkAndWarpImage: %1" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ) );
return;
}
GDALDestroyGenImgProjTransformer( myWarpOptions->pTransformerArg );
GDALDestroyWarpOptions( myWarpOptions );
// flush should not be necessary
//GDALFlushCache ( myGdalMemDataset );
// this was causing crash ???
// The MEM driver does not free() the memory passed as DATAPOINTER so we can closee the dataset
GDALClose( myGdalMemDataset );
}
#endif
#if 0
bool QgsGdalProvider::srcHasNoDataValue( int bandNo ) const
{
if ( mGdalDataset )
{
GDALRasterBandH myGdalBand = GDALGetRasterBand( mGdalDataset, bandNo );
if ( myGdalBand )
{
int ok;
GDALGetRasterNoDataValue( myGdalBand, &ok );
return ok;
}
}
return false;
}
double QgsGdalProvider::noDataValue() const
{
if ( mNoDataValue.size() > 0 )
{
return mNoDataValue[0];
}
return std::numeric_limits<int>::max(); // should not happen or be used
}
#endif
void QgsGdalProvider::computeMinMax( int theBandNo ) const
{
QgsDebugMsg( QString( "theBandNo = %1 mMinMaxComputed = %2" ).arg( theBandNo ).arg( mMinMaxComputed[theBandNo-1] ) );
if ( mMinMaxComputed[theBandNo-1] )
{
return;
}
GDALRasterBandH myGdalBand = GDALGetRasterBand( mGdalDataset, theBandNo );
int bGotMin, bGotMax;
double adfMinMax[2];
adfMinMax[0] = GDALGetRasterMinimum( myGdalBand, &bGotMin );
adfMinMax[1] = GDALGetRasterMaximum( myGdalBand, &bGotMax );
if ( !( bGotMin && bGotMax ) )
{
GDALComputeRasterMinMax( myGdalBand, TRUE, adfMinMax );
}
mMinimum[theBandNo-1] = adfMinMax[0];
mMaximum[theBandNo-1] = adfMinMax[1];
}
double QgsGdalProvider::minimumValue( int theBandNo ) const
{
QgsDebugMsg( QString( "theBandNo = %1" ).arg( theBandNo ) );
if ( !mMinMaxComputed[theBandNo-1] )
{
computeMinMax( theBandNo );
mMinMaxComputed[theBandNo-1] = true;
}
return mMinimum[theBandNo-1];
}
double QgsGdalProvider::maximumValue( int theBandNo ) const
{
QgsDebugMsg( QString( "theBandNo = %1" ).arg( theBandNo ) );
if ( !mMinMaxComputed[theBandNo-1] )
{
computeMinMax( theBandNo );
mMinMaxComputed[theBandNo-1] = true;
}
computeMinMax( theBandNo );
return mMaximum[theBandNo-1];
}
/**
* @param theBandNumber the number of the band for which you want a color table
* @param theList a pointer the object that will hold the color table
* @return true of a color table was able to be read, false otherwise
*/
QList<QgsColorRampShader::ColorRampItem> QgsGdalProvider::colorTable( int theBandNumber )const
{
QgsDebugMsg( "entered." );
return QgsGdalProviderBase::colorTable( mGdalDataset, theBandNumber );
}
QgsCoordinateReferenceSystem QgsGdalProvider::crs()
{
QgsDebugMsg( "Entered" );
return mCrs;
}
QgsRectangle QgsGdalProvider::extent()
{
//TODO
//mExtent = QgsGdal::extent( mGisdbase, mLocation, mMapset, mMapName, QgsGdal::Raster );
return mExtent;
}
// this is only called once when statistics are calculated
// TODO
int QgsGdalProvider::xBlockSize() const
{
return mXBlockSize;
}
int QgsGdalProvider::yBlockSize() const
{
return mYBlockSize;
}
int QgsGdalProvider::xSize() const { return mWidth; }
int QgsGdalProvider::ySize() const { return mHeight; }
QMap<int, QVariant> QgsGdalProvider::identify( const QgsPoint & thePoint, IdentifyFormat theFormat, const QgsRectangle &theExtent, int theWidth, int theHeight )
{
QgsDebugMsg( QString( "thePoint = %1 %2" ).arg( thePoint.x(), 0, 'g', 10 ).arg( thePoint.y(), 0, 'g', 10 ) );
QMap<int, QVariant> results;
if ( theFormat != IdentifyFormatValue ) return results;
if ( !extent().contains( thePoint ) )
{
// Outside the raster
for ( int bandNo = 1; bandNo <= bandCount(); bandNo++ )
{
results.insert( bandNo, noDataValue( bandNo ) );
}
return results;
}
QgsRectangle myExtent = theExtent;
if ( myExtent.isEmpty() ) myExtent = extent();
QgsDebugMsg( "myExtent = " + myExtent.toString() );
if ( theWidth == 0 ) theWidth = xSize();
if ( theHeight == 0 ) theHeight = ySize();
QgsDebugMsg( QString( "theWidth = %1 theHeight = %2" ).arg( theWidth ).arg( theHeight ) );
// Calculate the row / column where the point falls
double xres = ( myExtent.width() ) / theWidth;
double yres = ( myExtent.height() ) / theHeight;
// Offset, not the cell index -> floor
int col = ( int ) floor(( thePoint.x() - myExtent.xMinimum() ) / xres );
int row = ( int ) floor(( myExtent.yMaximum() - thePoint.y() ) / yres );
QgsDebugMsg( QString( "row = %1 col = %2" ).arg( row ).arg( col ) );
// QgsDebugMsg( "row = " + QString::number( row ) + " col = " + QString::number( col ) );
int r = 0;
int c = 0;
int width = 1;
int height = 1;
// GDAL ECW driver in GDAL < 1.9.2 read whole row if single pixel (nYSize == 1)
// was requested which made identify very slow -> use 2x2 matrix
// but other drivers may be optimised for 1x1 -> conditional
#if !defined(GDAL_VERSION_NUM) || GDAL_VERSION_NUM < 1920
if ( strcmp( GDALGetDriverShortName( GDALGetDatasetDriver( mGdalDataset ) ), "ECW" ) == 0 )
{
width = 2;
height = 2;
if ( col == mWidth - 1 && mWidth > 1 )
{
col--;
c++;
}
if ( row == mHeight - 1 && mHeight > 1 )
{
row--;
r++;
}
}
#endif
double xMin = myExtent.xMinimum() + col * xres;
double xMax = xMin + xres * width;
double yMax = myExtent.yMaximum() - row * yres;
double yMin = yMax - yres * height;
QgsRectangle pixelExtent( xMin, yMin, xMax, yMax );
for ( int i = 1; i <= bandCount(); i++ )
{
QgsRasterBlock * myBlock = block( i, pixelExtent, width, height );
if ( !myBlock )
{
results.clear();
return results;
}
double value = myBlock->value( r, c );
results.insert( i, value );
}
return results;
}
int QgsGdalProvider::capabilities() const
{
int capability = QgsRasterDataProvider::Identify
| QgsRasterDataProvider::IdentifyValue
| QgsRasterDataProvider::ExactResolution
| QgsRasterDataProvider::EstimatedMinimumMaximum
| QgsRasterDataProvider::BuildPyramids
| QgsRasterDataProvider::Histogram
| QgsRasterDataProvider::Create
| QgsRasterDataProvider::Remove;
GDALDriverH myDriver = GDALGetDatasetDriver( mGdalDataset );
QString name = GDALGetDriverShortName( myDriver );
QgsDebugMsg( "driver short name = " + name );
if ( name != "WMS" )
{
capability |= QgsRasterDataProvider::Size;
}
return capability;
}
QGis::DataType QgsGdalProvider::dataTypeFormGdal( int theGdalDataType ) const
{
switch ( theGdalDataType )
{
case GDT_Unknown:
return QGis::UnknownDataType;
break;
case GDT_Byte:
return QGis::Byte;
break;
case GDT_UInt16:
return QGis::UInt16;
break;
case GDT_Int16:
return QGis::Int16;
break;
case GDT_UInt32:
return QGis::UInt32;
break;
case GDT_Int32:
return QGis::Int32;
break;