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qgsgdalprovider.cpp
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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. *
* *
***************************************************************************/
/* $Id: qgsgdalprovider.cpp 11522 2009-08-28 14:49:22Z jef $ */
#include "qgslogger.h"
#include "qgsgdalprovider.h"
#include "qgsconfig.h"
#include "qgsapplication.h"
#include "qgscoordinatetransform.h"
#include "qgsrectangle.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsrasterbandstats.h"
#include "qgsrasterpyramid.h"
#include <QImage>
#include <QSettings>
#include <QColor>
#include <QProcess>
#include <QMessageBox>
#include <QDir>
#include <QFileInfo>
#include <QFile>
#include <QHash>
#include "gdalwarper.h"
#include "ogr_spatialref.h"
#include "cpl_conv.h"
#include "cpl_string.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
static QString PROVIDER_KEY = "gdal";
static QString PROVIDER_DESCRIPTION = "GDAL provider";
//
// global callback function
//
int CPL_STDCALL progressCallback( double dfComplete,
const char * pszMessage,
void * pProgressArg )
{
// TODO: add signals to providers
static double dfLastComplete = -1.0;
if ( dfLastComplete > dfComplete )
{
if ( dfLastComplete >= 1.0 )
dfLastComplete = -1.0;
else
dfLastComplete = dfComplete;
}
if ( floor( dfLastComplete*10 ) != floor( dfComplete*10 ) )
{
int nPercent = ( int ) floor( dfComplete * 100 );
if ( nPercent == 0 && pszMessage != NULL )
{
//fprintf( stdout, "%s:", pszMessage );
}
if ( nPercent == 100 )
{
fprintf( stdout, "%d - done.\n", ( int ) floor( dfComplete*100 ) );
//mypLayer->showProgress( 100 );
}
else
{
int myProgress = ( int ) floor( dfComplete * 100 );
fprintf( stdout, "%d.", myProgress );
//mypLayer->showProgress( myProgress );
fflush( stdout );
}
}
dfLastComplete = dfComplete;
return true;
}
QgsGdalProvider::QgsGdalProvider( QString const & uri )
: QgsRasterDataProvider( uri ), mValid( true )
{
QgsDebugMsg( "QgsGdalProvider: constructing with uri '" + uri + "'." );
mValid = false;
mGdalBaseDataset = 0;
mGdalDataset = 0;
registerGdalDrivers();
// To get buildSupportedRasterFileFilter the provider is called with empty uri
if ( uri.isEmpty() ) return;
// Initialise the affine transform matrix
mGeoTransform[0] = 0;
mGeoTransform[1] = 1;
mGeoTransform[2] = 0;
mGeoTransform[3] = 0;
mGeoTransform[4] = 0;
mGeoTransform[5] = -1;
mGdalDataset = NULL;
//mGdalBaseDataset = GDALOpen( QFile::encodeName( uri ).constData(), GA_ReadOnly );
mGdalBaseDataset = GDALOpen( TO8F( uri ), GA_ReadOnly );
CPLErrorReset();
if ( mGdalBaseDataset == NULL )
{
QgsDebugMsg( QString( "Cannot open GDAL dataset %1: %2" ).arg( uri ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ) );
return;
}
QgsDebugMsg( "GdalDataset opened" );
for ( int i = 0; i < GDALGetRasterCount( mGdalBaseDataset ); i++ )
{
mMinMaxComputed.append( false );
mMinimum.append( 0 );
mMaximum.append( 0 );
}
// Check if we need a warped VRT for this file.
if (( GDALGetGeoTransform( mGdalBaseDataset, mGeoTransform ) == CE_None
&& ( mGeoTransform[1] < 0.0
|| mGeoTransform[2] != 0.0
|| mGeoTransform[4] != 0.0
|| mGeoTransform[5] > 0.0 ) )
|| GDALGetGCPCount( mGdalBaseDataset ) > 0 )
{
QgsLogger::warning( "Creating Warped VRT." );
mGdalDataset =
GDALAutoCreateWarpedVRT( mGdalBaseDataset, NULL, NULL,
GRA_NearestNeighbour, 0.2, NULL );
if ( mGdalDataset == NULL )
{
QgsLogger::warning( "Warped VRT Creation failed." );
mGdalDataset = mGdalBaseDataset;
GDALReferenceDataset( mGdalDataset );
}
}
else
{
mGdalDataset = mGdalBaseDataset;
GDALReferenceDataset( mGdalDataset );
}
//check if this file has pyramids
CPLErrorReset();
GDALRasterBandH myGDALBand = GDALGetRasterBand( mGdalDataset, 1 ); //just use the first band
if ( myGDALBand == NULL )
{
QMessageBox::warning( 0, QObject::tr( "Warning" ),
QObject::tr( "Cannot get GDAL raster band: %1" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ) );
GDALDereferenceDataset( mGdalBaseDataset );
mGdalBaseDataset = NULL;
GDALClose( mGdalDataset );
mGdalDataset = NULL;
return;
}
mHasPyramids = GDALGetOverviewCount( myGDALBand ) > 0;
// Get the layer's projection info and set up the
// QgsCoordinateTransform for this layer
// NOTE: we must do this before metadata is called
QString myWktString;
myWktString = QString( GDALGetProjectionRef( mGdalDataset ) );
mCrs.createFromWkt( myWktString );
if ( !mCrs.isValid() )
{
//try to get the gcp srs from the raster layer if available
myWktString = QString( GDALGetGCPProjection( mGdalDataset ) );
// What is the purpose of this piece of code?
// Sideeffects from validate()?
// myCRS.createFromWkt(myWktString);
// if (!myCRS.isValid())
// {
// // use force and make CRS valid!
// myCRS.validate();
// }
}
//set up the coordinat transform - in the case of raster this is mainly used to convert
//the inverese projection of the map extents of the canvas when zooming in etc. so
//that they match the coordinate system of this layer
//QgsDebugMsg( "Layer registry has " + QString::number( QgsMapLayerRegistry::instance()->count() ) + "layers" );
//metadata();
// Use the affine transform to get geo coordinates for
// the corners of the raster
double myXMax = mGeoTransform[0] +
GDALGetRasterXSize( mGdalDataset ) * mGeoTransform[1] +
GDALGetRasterYSize( mGdalDataset ) * mGeoTransform[2];
double myYMin = mGeoTransform[3] +
GDALGetRasterXSize( mGdalDataset ) * mGeoTransform[4] +
GDALGetRasterYSize( mGdalDataset ) * mGeoTransform[5];
mExtent.setXMaximum( myXMax );
// The affine transform reduces to these values at the
// top-left corner of the raster
mExtent.setXMinimum( mGeoTransform[0] );
mExtent.setYMaximum( mGeoTransform[3] );
mExtent.setYMinimum( myYMin );
//
// Set up the x and y dimensions of this raster layer
//
mWidth = GDALGetRasterXSize( mGdalDataset );
mHeight = GDALGetRasterYSize( mGdalDataset );
GDALGetBlockSize( GDALGetRasterBand( mGdalDataset, 1 ), &mXBlockSize, &mYBlockSize );
//
// Determine the nodata value and data type
//
mValidNoDataValue = true;
for ( int i = 1; i <= GDALGetRasterCount( mGdalBaseDataset ); i++ )
{
computeMinMax( i );
GDALRasterBandH myGdalBand = GDALGetRasterBand( mGdalDataset, i );
GDALDataType myGdalDataType = GDALGetRasterDataType( myGdalBand );
int isValid = false;
double myNoDataValue = GDALGetRasterNoDataValue( GDALGetRasterBand( mGdalDataset, i ), &isValid );
if ( isValid )
{
QgsDebugMsg( QString( "GDALGetRasterNoDataValue = %1" ).arg( myNoDataValue ) ) ;
mGdalDataType.append( myGdalDataType );
}
else
{
// But we need a null value in case of reprojection and BTW also for
// aligned margines
switch ( srcDataType( i ) )
{
case QgsRasterDataProvider::Byte:
// Use longer data type to avoid conflict with real data
myNoDataValue = -32768.0;
mGdalDataType.append( GDT_Int16 );
break;
case QgsRasterDataProvider::Int16:
myNoDataValue = -2147483648.0;
mGdalDataType.append( GDT_Int32 );
break;
case QgsRasterDataProvider::UInt16:
myNoDataValue = -2147483648.0;
mGdalDataType.append( GDT_Int32 );
break;
case QgsRasterDataProvider::Int32:
myNoDataValue = -2147483648.0;
mGdalDataType.append( myGdalDataType );
break;
case QgsRasterDataProvider::UInt32:
myNoDataValue = 4294967295.0;
mGdalDataType.append( myGdalDataType );
break;
default:
myNoDataValue = std::numeric_limits<int>::max();
// Would NaN work well?
//myNoDataValue = std::numeric_limits<double>::quiet_NaN();
mGdalDataType.append( myGdalDataType );
}
}
mNoDataValue.append( myNoDataValue );
QgsDebugMsg( QString( "mNoDataValue[%1] = %1" ).arg( i - 1 ).arg( mNoDataValue[i-1] ) );
}
// This block of code was in old version in QgsRasterLayer::bandStatistics
//ifdefs below to remove compiler warning about unused vars
#ifdef QGISDEBUG
#if 0
int success;
double GDALminimum = GDALGetRasterMinimum( myGdalBand, &success );
if ( ! success )
{
QgsDebugMsg( "myGdalBand->GetMinimum() failed" );
}
double GDALmaximum = GDALGetRasterMaximum( myGdalBand, &success );
if ( ! success )
{
QgsDebugMsg( "myGdalBand->GetMaximum() failed" );
}
double GDALnodata = GDALGetRasterNoDataValue( myGdalBand, &success );
if ( ! success )
{
QgsDebugMsg( "myGdalBand->GetNoDataValue() failed" );
}
QgsLogger::debug( "GDALminium: ", GDALminimum, __FILE__, __FUNCTION__, __LINE__ );
QgsLogger::debug( "GDALmaximum: ", GDALmaximum, __FILE__, __FUNCTION__, __LINE__ );
QgsLogger::debug( "GDALnodata: ", GDALnodata, __FILE__, __FUNCTION__, __LINE__ );
double GDALrange[2]; // calculated min/max, as opposed to the
// dataset provided
GDALComputeRasterMinMax( myGdalBand, 1, GDALrange );
QgsLogger::debug( "approximate computed GDALminium:", GDALrange[0], __FILE__, __FUNCTION__, __LINE__, 1 );
QgsLogger::debug( "approximate computed GDALmaximum:", GDALrange[1], __FILE__, __FUNCTION__, __LINE__, 1 );
GDALComputeRasterMinMax( myGdalBand, 0, GDALrange );
QgsLogger::debug( "exactly computed GDALminium:", GDALrange[0] );
QgsLogger::debug( "exactly computed GDALmaximum:", GDALrange[1] );
QgsDebugMsg( "starting manual stat computation" );
#endif
#endif
mValid = true;
QgsDebugMsg( "end" );
}
QgsGdalProvider::~QgsGdalProvider()
{
QgsDebugMsg( "QgsGdalProvider: deconstructing." );
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 += QFile::decodeName( 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
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>";
}
}
myMetadata += "</p>\n";
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 )
{
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;
}
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] ) );
}
// TODO: fill block with no data values
QgsRectangle myRasterExtent = theExtent.intersect( &mExtent );
if ( myRasterExtent.isEmpty() )
{
QgsDebugMsg( "draw request outside view extent." );
return;
}
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
// IMHO, we cannot align target grid to raster grid using target grid edges
// and finding the nearest raster grid because it could lead to cell center
// getting outside the right cell when doing resampling, example
// Raster width is 30m and it has 3 columns and we want to read xrange 5.1-30
// to 3 columns, the nearest edge for beginning in raster grid is 10.0
// reading cols 1-2, we get raster[1] value in target[0], but the center of
// target[0] is 5.1 + ((30-5.1)/3)/2 = 9.25 so it falls to raster[0]. Is it right?
// => We are looking for such alignment with which the center of first/last cell
// alls to the right raster cell
double center, centerRaster;
int rasterTop, rasterBottom, rasterLeft, rasterRight;
// We have to extend destination grid for GDALRasterIO to keep resolution:
double topSpace, bottomSpace, leftSpace, rightSpace;
// top
center = myRasterExtent.yMaximum() - yRes / 2;
// center in raster space
// GDAL states that mGeoTransform[3] is top, but probably it can be also bottom
// if mGeoTransform[5] is negative ??? No, mGeoTransform[5] is negative normaly
// - vice versa?
//if ( mGeoTransform[5] > 0 )
if ( mGeoTransform[5] < 0 )
{
centerRaster = -1. * ( mGeoTransform[3] - center ) / mGeoTransform[5];
}
else
{
centerRaster = ( center - mGeoTransform[3] ) / mGeoTransform[5];
}
rasterTop = static_cast<int>( floor( centerRaster ) );
topSpace = ( mGeoTransform[3] + rasterTop * mGeoTransform[5] ) - myRasterExtent.yMaximum();
// bottom
center = myRasterExtent.yMinimum() + yRes / 2;
//if ( mGeoTransform[5] > 0 )
if ( mGeoTransform[5] < 0 )
{
centerRaster = -1. * ( mGeoTransform[3] - center ) / mGeoTransform[5];
}
else
{
centerRaster = ( center - mGeoTransform[3] ) / mGeoTransform[5];
}
rasterBottom = static_cast<int>( floor( centerRaster ) );
bottomSpace = myRasterExtent.yMinimum() - ( mGeoTransform[3] + ( rasterBottom + 1 ) * mGeoTransform[5] );
// left
center = myRasterExtent.xMinimum() + xRes / 2;
centerRaster = ( center - mGeoTransform[0] ) / mGeoTransform[1];
rasterLeft = static_cast<int>( floor( centerRaster ) );
leftSpace = myRasterExtent.xMinimum() - ( mGeoTransform[0] + rasterLeft * mGeoTransform[1] );
// right
center = myRasterExtent.xMaximum() - xRes / 2;
centerRaster = ( center - mGeoTransform[0] ) / mGeoTransform[1];
rasterRight = static_cast<int>( floor( centerRaster ) );
rightSpace = ( mGeoTransform[0] + ( rasterRight + 1 ) * mGeoTransform[1] ) - myRasterExtent.xMaximum();
QgsDebugMsg( QString( "rasterTop = %1 rasterBottom = %2 rasterLeft = %3 rasterRight = %4" ).arg( rasterTop ).arg( rasterBottom ).arg( rasterLeft ).arg( rasterRight ) );
QgsDebugMsg( QString( "topSpace = %1 bottomSpace = %2 leftSpace = %3 rightSpace = %4" ).arg( topSpace ).arg( bottomSpace ).arg( leftSpace ).arg( rightSpace ) );
int width = right - left + 1;
int height = bottom - top + 1;
int rasterWidth = rasterRight - rasterLeft + 1;
int rasterHeight = rasterBottom - rasterTop + 1;
QgsDebugMsg( QString( "width = %1 height = %2 rasterWidth = %3 rasterHeight = %4" ).arg( width ).arg( height ).arg( rasterWidth ).arg( rasterHeight ) );
// TODO: what is better floor/ceil, can be negative?
// should be similar
//double xAdd = rasterWidth*rasterXRes - width*xRes;
double xAdd = leftSpace + rightSpace;
int xAddPixels = qRound( xAdd / xRes );
int leftAddPixels = qRound( leftSpace / xRes );
//double leftAdd = rasterWidth*rasterXRes - width*xRes;
double yAdd = topSpace + bottomSpace;
int yAddPixels = qRound( yAdd / yRes );
int topAddPixels = qRound( topSpace / yRes );
QgsDebugMsg( QString( "xAddPixels = %1 yAddPixels = %2 leftAddPixels = %3 topAddPixels = %4" ).arg( xAddPixels ).arg( yAddPixels ).arg( leftAddPixels ).arg( topAddPixels ) );
// Currently only positive allowed, verify if negative has sense and check following use
xAddPixels = xAddPixels > 0 ? xAddPixels : 0;
yAddPixels = yAddPixels > 0 ? yAddPixels : 0;
leftAddPixels = leftAddPixels > 0 ? leftAddPixels : 0;
topAddPixels = topAddPixels > 0 ? topAddPixels : 0;
int totalWidth = width + xAddPixels;
int totalHeight = height + yAddPixels;
QgsDebugMsg( QString( "totalWidth = %1 totalHeight = %2" ).arg( totalWidth ).arg( totalHeight ) );
int size = dataTypeSize( theBandNo ) / 8;
// fill with null values
QByteArray ba = noValueBytes( theBandNo );
char *nodata = ba.data();
char *block = ( char * ) theBlock;
for ( int i = 0; i < thePixelWidth * thePixelHeight; i++ )
{
memcpy( block, nodata, size );
block += size;
}
GDALRasterBandH gdalBand = GDALGetRasterBand( mGdalDataset, theBandNo );
GDALDataType type = ( GDALDataType )mGdalDataType[theBandNo-1];
CPLErrorReset();
// This can be probably used if xAddPixels and yAddPixels are 0 to avoid memcpy
#if 0
// Calc beginnig of data if raster does not start at top
block = ( char * ) theBlock;
if ( top != 0 )
{
block += size * thePixelWidth * top;
}
// Cal nLineSpace if raster does not cover whole extent
int nLineSpace = size * thePixelWidth;
if ( left != 0 )
{
block += size * left;
}
CPLErr err = GDALRasterIO( gdalBand, GF_Read,
rasterLeft, rasterTop, rasterWidth, rasterHeight,
( void * )block,
width, height, type,
0, nLineSpace );
#endif
// Allocate temporary block
void *tmpBlock = malloc( size * totalWidth * totalHeight );
CPLErrorReset();
CPLErr err = GDALRasterIO( gdalBand, GF_Read,
rasterLeft, rasterTop, rasterWidth, rasterHeight,
( void * )tmpBlock,
totalWidth, totalHeight, type,
0, 0 );
if ( err != CPLE_None )
{
QgsLogger::warning( "RasterIO error: " + QString::fromUtf8( CPLGetLastErrorMsg() ) );
QgsDebugMsg( "RasterIO error: " + QString::fromUtf8( CPLGetLastErrorMsg() ) );
free( tmpBlock );
return;
}
for ( int i = 0; i < height; i++ )
{
int r = i + topAddPixels;
char *src = ( char * )tmpBlock + size * r * totalWidth + size * leftAddPixels;
char *dst = ( char * )theBlock + size * ( top + i ) * thePixelWidth + size * ( left );
memcpy( dst, src, size*width );
}
free( tmpBlock );
return;
}
// 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 * ) CPLMalloc( sizeof( int ) * myWarpOptions->nBandCount );
myWarpOptions->panSrcBands[0] = theBandNo;
myWarpOptions->panDstBands =
( int * ) CPLMalloc( 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
);
/*
myWarpOptions->pTransformerArg =
GDALCreateGenImgProjTransformer2(
mGdalDataset,
myGdalMemDataset,
NULL
);
*/
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 * ) CPLMalloc( myWarpOptions->nBandCount * sizeof( double ) );
myWarpOptions->padfDstNoDataImag = ( double * ) CPLMalloc( 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
double QgsGdalProvider::noDataValue() const
{
if ( mNoDataValue.size() > 0 )
{
return mNoDataValue[0];
}
return std::numeric_limits<int>::max(); // should not happen or be used
}
void QgsGdalProvider::computeMinMax( int theBandNo )
{
QgsDebugMsg( QString( "theBandNo = %1 mMinMaxComputed = %2" ).arg( theBandNo ).arg( mMinMaxComputed[theBandNo-1] ) );
if ( mMinMaxComputed[theBandNo-1] ) return;
double GDALrange[2];
GDALRasterBandH myGdalBand = GDALGetRasterBand( mGdalDataset, theBandNo );
GDALComputeRasterMinMax( myGdalBand, 1, GDALrange ); //Approximate
QgsDebugMsg( QString( "GDALrange[0] = %1 GDALrange[1] = %2" ).arg( GDALrange[0] ).arg( GDALrange[1] ) );
mMinimum[theBandNo-1] = GDALrange[0];
mMaximum[theBandNo-1] = GDALrange[1];
}
double QgsGdalProvider::minimumValue( int theBandNo ) const
{
QgsDebugMsg( QString( "theBandNo = %1" ).arg( theBandNo ) );
//computeMinMax ( theBandNo );
return mMinimum[theBandNo-1];
}
double QgsGdalProvider::maximumValue( int theBandNo ) const
{
QgsDebugMsg( QString( "theBandNo = %1" ).arg( theBandNo ) );
//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." );
QList<QgsColorRampShader::ColorRampItem> ct;
//Invalid band number, segfault prevention
if ( 0 >= theBandNumber )
{
QgsDebugMsg( "Invalid parameter" );
return ct;
}
GDALRasterBandH myGdalBand = GDALGetRasterBand( mGdalDataset, theBandNumber );
GDALColorTableH myGdalColorTable = GDALGetRasterColorTable( myGdalBand );
if ( myGdalColorTable )
{
QgsDebugMsg( "Color table found" );
int myEntryCount = GDALGetColorEntryCount( myGdalColorTable );
GDALColorInterp myColorInterpretation = GDALGetRasterColorInterpretation( myGdalBand );
QgsDebugMsg( "Color Interpretation: " + QString::number(( int )myColorInterpretation ) );
GDALPaletteInterp myPaletteInterpretation = GDALGetPaletteInterpretation( myGdalColorTable );
QgsDebugMsg( "Palette Interpretation: " + QString::number(( int )myPaletteInterpretation ) );
const GDALColorEntry* myColorEntry = 0;
for ( int myIterator = 0; myIterator < myEntryCount; myIterator++ )
{
myColorEntry = GDALGetColorEntry( myGdalColorTable, myIterator );
if ( !myColorEntry )
{
continue;
}
else
{
//Branch on the color interpretation type
if ( myColorInterpretation == GCI_GrayIndex )
{
QgsColorRampShader::ColorRampItem myColorRampItem;
myColorRampItem.label = "";
myColorRampItem.value = ( double )myIterator;
myColorRampItem.color = QColor::fromRgb( myColorEntry->c1, myColorEntry->c1, myColorEntry->c1, myColorEntry->c4 );
ct.append( myColorRampItem );
}
else if ( myColorInterpretation == GCI_PaletteIndex )
{
QgsColorRampShader::ColorRampItem myColorRampItem;
myColorRampItem.label = "";
myColorRampItem.value = ( double )myIterator;
//Branch on palette interpretation
if ( myPaletteInterpretation == GPI_RGB )
{
myColorRampItem.color = QColor::fromRgb( myColorEntry->c1, myColorEntry->c2, myColorEntry->c3, myColorEntry->c4 );
}
else if ( myPaletteInterpretation == GPI_CMYK )
{
myColorRampItem.color = QColor::fromCmyk( myColorEntry->c1, myColorEntry->c2, myColorEntry->c3, myColorEntry->c4 );
}
else if ( myPaletteInterpretation == GPI_HLS )
{
myColorRampItem.color = QColor::fromHsv( myColorEntry->c1, myColorEntry->c3, myColorEntry->c2, myColorEntry->c4 );
}
else