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qgsrasterlayer.cpp
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qgsrasterlayer.cpp
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/* **************************************************************************
qgsrasterlayer.cpp - description
-------------------
begin : Sat Jun 22 2002
copyright : (C) 2003 by Tim Sutton, Steve Halasz and Gary E.Sherman
email : tim at linfiniti.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 "qgsapplication.h"
#include "qgslogger.h"
#include "qgsmaplayerregistry.h"
#include "qgsmaptopixel.h"
#include "qgsproviderregistry.h"
#include "qgsrasterbandstats.h"
#include "qgsrasterlayer.h"
#include "qgsrasterpyramid.h"
#include "qgsrectangle.h"
#include "qgsrendercontext.h"
#include "qgscoordinatereferencesystem.h"
#include "gdalwarper.h"
#include "cpl_conv.h"
#include "qgspseudocolorshader.h"
#include "qgsfreakoutshader.h"
#include "qgscolorrampshader.h"
#include <cstdio>
#include <cmath>
#include <limits>
#include <QApplication>
#include <QCursor>
#include <QDomElement>
#include <QDomNode>
#include <QFile>
#include <QFileInfo>
#include <QFont>
#include <QFontMetrics>
#include <QFrame>
#include <QImage>
#include <QLabel>
#include <QList>
#include <QMatrix>
#include <QMessageBox>
#include <QLibrary>
#include <QPainter>
#include <QPixmap>
#include <QRegExp>
#include <QSlider>
#include <QSettings>
#include "qgslogger.h"
// workaround for MSVC compiler which already has defined macro max
// that interferes with calling std::numeric_limits<int>::max
#ifdef _MSC_VER
# ifdef max
# undef max
# endif
#endif
// Comparison value for equality; i.e., we shouldn't directly compare two
// floats so it's better to take their difference and see if they're within
// a certain range -- in this case twenty times the smallest value that
// doubles can take for the current system. (Yes, 20 was arbitrary.)
#define TINY_VALUE std::numeric_limits<double>::epsilon() * 20
QgsRasterLayer::QgsRasterLayer(
QString const & path,
QString const & baseName,
bool loadDefaultStyleFlag )
: QgsMapLayer( RasterLayer, baseName, path ),
// Constant that signals property not used.
QSTRING_NOT_SET( "Not Set" ),
TRSTRING_NOT_SET( tr( "Not Set" ) ),
mStandardDeviations( 0 ),
mDataProvider( 0 ),
mWidth( std::numeric_limits<int>::max() ),
mHeight( std::numeric_limits<int>::max() ),
mInvertColor( false )
{
mRasterType = QgsRasterLayer::GrayOrUndefined;
mRedBandName = TRSTRING_NOT_SET;
mGreenBandName = TRSTRING_NOT_SET;
mBlueBandName = TRSTRING_NOT_SET;
mGrayBandName = TRSTRING_NOT_SET;
mTransparencyBandName = TRSTRING_NOT_SET;
mUserDefinedRGBMinimumMaximum = false; //defaults needed to bypass enhanceContrast
mUserDefinedGrayMinimumMaximum = false;
mRGBMinimumMaximumEstimated = true;
mGrayMinimumMaximumEstimated = true;
mDrawingStyle = QgsRasterLayer::UndefinedDrawingStyle;
mContrastEnhancementAlgorithm = QgsContrastEnhancement::NoEnhancement;
mColorShadingAlgorithm = QgsRasterLayer::UndefinedShader;
mRasterShader = new QgsRasterShader();
mBandCount = 0;
mHasPyramids = false;
mNoDataValue = -9999.0;
mValidNoDataValue = false;
mGdalBaseDataset = 0;
mGdalDataset = 0;
// Initialise the affine transform matrix
mGeoTransform[0] = 0;
mGeoTransform[1] = 1;
mGeoTransform[2] = 0;
mGeoTransform[3] = 0;
mGeoTransform[4] = 0;
mGeoTransform[5] = -1;
// set the layer name (uppercase first character)
if ( ! baseName.isEmpty() ) // XXX shouldn't this happen in parent?
{
setLayerName( baseName );
}
// load the file if one specified
if ( ! path.isEmpty() )
{
readFile( path ); // XXX check for failure?
//readFile() is really an extension of the constructor as many imporant fields are set in this method
//loadDefaultStyle() can not be called before the layer has actually be opened
if ( loadDefaultStyleFlag )
{
bool defaultLoadedFlag = false;
loadDefaultStyle( defaultLoadedFlag );
if ( defaultLoadedFlag )
{
return;
}
}
}
//Initialize the last view port structure, should really be a class
mLastViewPort.rectXOffset = 0;
mLastViewPort.rectXOffsetFloat = 0.0;
mLastViewPort.rectYOffset = 0;
mLastViewPort.rectYOffsetFloat = 0.0;
mLastViewPort.clippedXMin = 0.0;
mLastViewPort.clippedXMax = 0.0;
mLastViewPort.clippedYMin = 0.0;
mLastViewPort.clippedYMax = 0.0;
mLastViewPort.clippedWidth = 0;
mLastViewPort.clippedHeight = 0;
mLastViewPort.drawableAreaXDim = 0;
mLastViewPort.drawableAreaYDim = 0;
} // QgsRasterLayer ctor
/**
* TODO Rename into a general constructor when the old raster interface is retired
* @param dummy is just there to distinguish this function signature from the old non-provider one.
*/
QgsRasterLayer::QgsRasterLayer( int dummy,
QString const & rasterLayerPath,
QString const & baseName,
QString const & providerKey,
QStringList const & layers,
QStringList const & styles,
QString const & format,
QString const & crs )
: QgsMapLayer( RasterLayer, baseName, rasterLayerPath ),
mStandardDeviations( 0 ),
mDataProvider( 0 ),
mEditable( false ),
mWidth( std::numeric_limits<int>::max() ),
mHeight( std::numeric_limits<int>::max() ),
mInvertColor( false ),
mModified( false ),
mProviderKey( providerKey )
{
QgsDebugMsg( "(8 arguments) starting. with layer list of " +
layers.join( ", " ) + " and style list of " + styles.join( ", " ) + " and format of " +
format + " and CRS of " + crs );
mBandCount = 0;
mRasterShader = new QgsRasterShader();
// Initialise the affine transform matrix
mGeoTransform[0] = 0;
mGeoTransform[1] = 1;
mGeoTransform[2] = 0;
mGeoTransform[3] = 0;
mGeoTransform[4] = 0;
mGeoTransform[5] = -1;
// if we're given a provider type, try to create and bind one to this layer
if ( ! providerKey.isEmpty() )
{
setDataProvider( providerKey, layers, styles, format, crs );
}
// Default for the popup menu
// TODO: popMenu = 0;
// Get the update threshold from user settings. We
// do this only on construction to avoid the penality of
// fetching this each time the layer is drawn. If the user
// changes the threshold from the preferences dialog, it will
// have no effect on existing layers
// TODO: QSettings settings;
// updateThreshold = settings.readNumEntry("Map/updateThreshold", 1000);
// TODO: Connect signals from the dataprovider to the qgisapp
// Do a passthrough for the status bar text
#if 0
connect(
mDataProvider, SIGNAL( statusChanged( QString ) ),
this, SLOT( showStatusMessage( QString ) )
);
#endif
QgsDebugMsg( "(8 arguments) exiting." );
emit statusChanged( tr( "QgsRasterLayer created" ) );
} // QgsRasterLayer ctor
QgsRasterLayer::~QgsRasterLayer()
{
if ( mProviderKey.isEmpty() )
{
if ( mGdalBaseDataset )
{
GDALDereferenceDataset( mGdalBaseDataset );
}
if ( mGdalDataset )
{
GDALClose( mGdalDataset );
}
}
delete mRasterShader;
}
//////////////////////////////////////////////////////////
//
// Static Methods and members
//
/////////////////////////////////////////////////////////
/**
Builds the list of file filter strings to later be used by
QgisApp::addRasterLayer()
We query GDAL for a list of supported raster formats; we then build
a list of file filter strings from that list. We return a string
that contains this list that is suitable for use in a
QFileDialog::getOpenFileNames() call.
*/
void QgsRasterLayer::buildSupportedRasterFileFilter( QString & theFileFiltersString )
{
// first get the GDAL driver manager
registerGdalDrivers();
// then iterate through all of the supported drivers, adding the
// corresponding file filter
GDALDriverH myGdalDriver; // current driver
char **myGdalDriverMetadata; // driver metadata strings
QString myGdalDriverLongName( "" ); // long name for the given driver
QString myGdalDriverExtension( "" ); // file name extension for given driver
QString myGdalDriverDescription; // QString wrapper of GDAL driver description
QStringList metadataTokens; // essentially the metadata string delimited by '='
QStringList catchallFilter; // for Any file(*.*), but also for those
// drivers with no specific file filter
GDALDriverH jp2Driver = NULL; // first JPEG2000 driver found
// Grind through all the drivers and their respective metadata.
// We'll add a file filter for those drivers that have a file
// extension defined for them; the others, well, even though
// theoreticaly we can open those files because there exists a
// driver for them, the user will have to use the "All Files" to
// open datasets with no explicitly defined file name extension.
// Note that file name extension strings are of the form
// "DMD_EXTENSION=.*". We'll also store the long name of the
// driver, which will be found in DMD_LONGNAME, which will have the
// same form.
// start with the default case
theFileFiltersString = tr( "[GDAL] All files (*)" );
for ( int i = 0; i < GDALGetDriverCount(); ++i )
{
myGdalDriver = GDALGetDriver( i );
Q_CHECK_PTR( myGdalDriver );
if ( !myGdalDriver )
{
QgsLogger::warning( "unable to get driver " + QString::number( i ) );
continue;
}
// now we need to see if the driver is for something currently
// supported; if not, we give it a miss for the next driver
myGdalDriverDescription = GDALGetDescription( myGdalDriver );
// QgsDebugMsg(QString("got driver string %1").arg(myGdalDriverDescription));
myGdalDriverMetadata = GDALGetMetadata( myGdalDriver, NULL );
// presumably we know we've run out of metadta if either the
// address is 0, or the first character is null
while ( myGdalDriverMetadata && '\0' != myGdalDriverMetadata[0] )
{
metadataTokens = QString( *myGdalDriverMetadata ).split( "=", QString::SkipEmptyParts );
// QgsDebugMsg(QString("\t%1").arg(*myGdalDriverMetadata));
// XXX add check for malformed metadataTokens
// Note that it's oddly possible for there to be a
// DMD_EXTENSION with no corresponding defined extension
// string; so we check that there're more than two tokens.
if ( metadataTokens.count() > 1 )
{
if ( "DMD_EXTENSION" == metadataTokens[0] )
{
myGdalDriverExtension = metadataTokens[1];
}
else if ( "DMD_LONGNAME" == metadataTokens[0] )
{
myGdalDriverLongName = metadataTokens[1];
// remove any superfluous (.*) strings at the end as
// they'll confuse QFileDialog::getOpenFileNames()
myGdalDriverLongName.remove( QRegExp( "\\(.*\\)$" ) );
}
}
// if we have both the file name extension and the long name,
// then we've all the information we need for the current
// driver; therefore emit a file filter string and move to
// the next driver
if ( !( myGdalDriverExtension.isEmpty() || myGdalDriverLongName.isEmpty() ) )
{
// XXX add check for SDTS; in that case we want (*CATD.DDF)
QString glob = "*." + myGdalDriverExtension.replace( "/", " *." );
// Add only the first JP2 driver found to the filter list (it's the one GDAL uses)
if ( myGdalDriverDescription == "JPEG2000" ||
myGdalDriverDescription.startsWith( "JP2" ) ) // JP2ECW, JP2KAK, JP2MrSID
{
if ( jp2Driver )
break; // skip if already found a JP2 driver
jp2Driver = myGdalDriver; // first JP2 driver found
glob += " *.j2k"; // add alternate extension
}
else if ( myGdalDriverDescription == "GTiff" )
{
glob += " *.tiff";
}
else if ( myGdalDriverDescription == "JPEG" )
{
glob += " *.jpeg";
}
theFileFiltersString += ";;[GDAL] " + myGdalDriverLongName + " (" + glob.toLower() + " " + glob.toUpper() + ")";
break; // ... to next driver, if any.
}
++myGdalDriverMetadata;
} // each metadata item
if ( myGdalDriverExtension.isEmpty() && !myGdalDriverLongName.isEmpty() )
{
// Then what we have here is a driver with no corresponding
// file extension; e.g., GRASS. In which case we append the
// string to the "catch-all" which will match all file types.
// (I.e., "*.*") We use the driver description intead of the
// long time to prevent the catch-all line from getting too
// large.
// ... OTOH, there are some drivers with missing
// DMD_EXTENSION; so let's check for them here and handle
// them appropriately
// USGS DEMs use "*.dem"
if ( myGdalDriverDescription.startsWith( "USGSDEM" ) )
{
QString glob = "*.dem";
theFileFiltersString += ";;[GDAL] " + myGdalDriverLongName + " (" + glob.toLower() + " " + glob.toUpper() + ")";
}
else if ( myGdalDriverDescription.startsWith( "DTED" ) )
{
// DTED use "*.dt0, *.dt1, *.dt2"
QString glob = "*.dt0";
glob += " *.dt1";
glob += " *.dt2";
theFileFiltersString += ";;[GDAL] " + myGdalDriverLongName + " (" + glob.toLower() + " " + glob.toUpper() + ")";
}
else if ( myGdalDriverDescription.startsWith( "MrSID" ) )
{
// MrSID use "*.sid"
QString glob = "*.sid";
theFileFiltersString += ";;[GDAL] " + myGdalDriverLongName + " (" + glob.toLower() + " " + glob.toUpper() + ")";
}
else
{
catchallFilter << QString( GDALGetDescription( myGdalDriver ) );
}
}
myGdalDriverExtension = myGdalDriverLongName = ""; // reset for next driver
} // each loaded GDAL driver
QgsDebugMsg( "Raster filter list built: " + theFileFiltersString );
} // buildSupportedRasterFileFilter_()
/**
* This helper checks to see whether the file name appears to be a valid raster file name
*/
bool QgsRasterLayer::isValidRasterFileName( QString const & theFileNameQString,
QString & retErrMsg )
{
GDALDatasetH myDataset;
registerGdalDrivers();
CPLErrorReset();
//open the file using gdal making sure we have handled locale properly
myDataset = GDALOpen( QFile::encodeName( theFileNameQString ).constData(), GA_ReadOnly );
if ( myDataset == NULL )
{
if ( CPLGetLastErrorNo() != CPLE_OpenFailed )
retErrMsg = QString::fromUtf8( CPLGetLastErrorMsg() );
return false;
}
else if ( GDALGetRasterCount( myDataset ) == 0 )
{
GDALClose( myDataset );
myDataset = NULL;
retErrMsg = tr( "This raster file has no bands and is invalid as a raster layer." );
return false;
}
else
{
GDALClose( myDataset );
return true;
}
}
bool QgsRasterLayer::isValidRasterFileName( QString const & theFileNameQString )
{
QString retErrMsg;
return isValidRasterFileName( theFileNameQString, retErrMsg );
}
QDateTime QgsRasterLayer::lastModified( QString const & name )
{
QgsDebugMsg( "name=" + name );
QDateTime t;
QFileInfo fi( name );
// Is it file?
if ( !fi.exists() ) return t;
t = fi.lastModified();
QgsDebugMsg( "last modified = " + t.toString() );
return t;
}
void QgsRasterLayer::registerGdalDrivers()
{
if ( GDALGetDriverCount() == 0 )
GDALAllRegister();
}
//////////////////////////////////////////////////////////
//
//Random Static convenience function
//
/////////////////////////////////////////////////////////
//TODO: Change these to private function or make seprate class
// convenience function for building metadata() HTML table cells
static QString makeTableCell_( QString const & value )
{
return "<p>\n" + value + "</p>\n";
} // makeTableCell_
// convenience function for building metadata() HTML table cells
static QString makeTableCells_( QStringList const & values )
{
QString s( "<tr>" );
for ( QStringList::const_iterator i = values.begin();
i != values.end();
++i )
{
s += makeTableCell_( *i );
}
s += "</tr>";
return s;
} // makeTableCell_
// convenience function for creating a string list from a C style string list
static QStringList cStringList2Q_( char ** stringList )
{
QStringList strings;
// presume null terminated string list
for ( size_t i = 0; stringList[i]; ++i )
{
strings.append( stringList[i] );
}
return strings;
} // cStringList2Q_
// typedef for the QgsDataProvider class factory
typedef QgsDataProvider * classFactoryFunction_t( const QString * );
//
// global callback function
//
int CPL_STDCALL progressCallback( double dfComplete,
const char * pszMessage,
void * pProgressArg )
{
static double dfLastComplete = -1.0;
QgsRasterLayer * mypLayer = ( QgsRasterLayer * ) pProgressArg;
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;
}
//////////////////////////////////////////////////////////
//
// Non Static Public methods
//
/////////////////////////////////////////////////////////
unsigned int QgsRasterLayer::bandCount()
{
return mBandCount;
}
const QString QgsRasterLayer::bandName( int theBandNo )
{
if ( theBandNo <= mRasterStatsList.size() && theBandNo > 0 )
{
//vector starts at base 0, band counts at base1 !
return mRasterStatsList[theBandNo - 1].bandName;
}
else
{
return QString( "" );
}
}
int QgsRasterLayer::bandNumber( QString const & theBandName )
{
for ( int myIterator = 0; myIterator < mRasterStatsList.size(); ++myIterator )
{
//find out the name of this band
QgsRasterBandStats myRasterBandStats = mRasterStatsList[myIterator];
QgsDebugMsg( "myRasterBandStats.bandName: " + myRasterBandStats.bandName + " :: theBandName: "
+ theBandName );
if ( myRasterBandStats.bandName == theBandName )
{
QgsDebugMsg( "********** band " + QString::number( myRasterBandStats.bandNumber ) +
" was found in bandNumber " + theBandName );
return myRasterBandStats.bandNumber;
}
}
QgsDebugMsg( "********** no band was found in bandNumber " + theBandName );
return 0; //no band was found
}
/**
* Private method to calculate statistics for a band. Populates rasterStatsMemArray.
* Calculates:
*
* <ul>
* <li>myRasterBandStats.elementCount
* <li>myRasterBandStats.minimumValue
* <li>myRasterBandStats.maximumValue
* <li>myRasterBandStats.sum
* <li>myRasterBandStats.range
* <li>myRasterBandStats.mean
* <li>myRasterBandStats.sumOfSquares
* <li>myRasterBandStats.stdDev
* <li>myRasterBandStats.colorTable
* </ul>
*
* @seealso RasterBandStats
* @note This is a cpu intensive and slow task!
*/
const QgsRasterBandStats QgsRasterLayer::bandStatistics( int theBandNo )
{
// check if we have received a valid band number
if (( GDALGetRasterCount( mGdalDataset ) < theBandNo ) && mRasterType != Palette )
{
// invalid band id, return nothing
QgsRasterBandStats myNullReturnStats;
return myNullReturnStats;
}
if ( mRasterType == Palette && ( theBandNo > 3 ) )
{
// invalid band id, return nothing
QgsRasterBandStats myNullReturnStats;
return myNullReturnStats;
}
// check if we have previously gathered stats for this band...
if ( theBandNo < 1 || theBandNo > mRasterStatsList.size() )
{
// invalid band id, return nothing
QgsRasterBandStats myNullReturnStats;
return myNullReturnStats;
}
QgsRasterBandStats myRasterBandStats = mRasterStatsList[theBandNo - 1];
myRasterBandStats.bandNumber = theBandNo;
// don't bother with this if we already have stats
if ( myRasterBandStats.statsGathered )
{
return myRasterBandStats;
}
// only print message if we are actually gathering the stats
emit statusChanged( tr( "Retrieving stats for %1" ).arg( name() ) );
qApp->processEvents();
QgsDebugMsg( "stats for band " + QString::number( theBandNo ) );
GDALRasterBandH myGdalBand = GDALGetRasterBand( mGdalDataset, theBandNo );
QString myColorerpretation = GDALGetColorInterpretationName( GDALGetRasterColorInterpretation( myGdalBand ) );
// XXX this sets the element count to a sensible value; but then you ADD to
// XXX it later while iterating through all the pixels?
//myRasterBandStats.elementCount = mWidth * mHeight;
myRasterBandStats.elementCount = 0; // because we'll be counting only VALID pixels later
emit statusChanged( tr( "Calculating stats for %1" ).arg( name() ) );
//reset the main app progress bar
emit drawingProgress( 0, 0 );
// let the user know we're going to possibly be taking a while
//QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
GDALDataType myDataType = GDALGetRasterDataType( myGdalBand );
int myNXBlocks, myNYBlocks, myXBlockSize, myYBlockSize;
GDALGetBlockSize( myGdalBand, &myXBlockSize, &myYBlockSize );
myNXBlocks = ( GDALGetRasterXSize( myGdalBand ) + myXBlockSize - 1 ) / myXBlockSize;
myNYBlocks = ( GDALGetRasterYSize( myGdalBand ) + myYBlockSize - 1 ) / myYBlockSize;
void *myData = CPLMalloc( myXBlockSize * myYBlockSize * ( GDALGetDataTypeSize( myDataType ) / 8 ) );
// unfortunately we need to make two passes through the data to calculate stddev
bool myFirstIterationFlag = true;
//ifdefs below to remove compiler warning about unused vars
#ifdef QGISDEBUG
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
int myGdalBandXSize = GDALGetRasterXSize( myGdalBand );
int myGdalBandYSize = GDALGetRasterYSize( myGdalBand );
for ( int iYBlock = 0; iYBlock < myNYBlocks; iYBlock++ )
{
emit drawingProgress( iYBlock, myNYBlocks * 2 );
for ( int iXBlock = 0; iXBlock < myNXBlocks; iXBlock++ )
{
int nXValid, nYValid;
GDALReadBlock( myGdalBand, iXBlock, iYBlock, myData );
// Compute the portion of the block that is valid
// for partial edge blocks.
if (( iXBlock + 1 ) * myXBlockSize > myGdalBandXSize )
nXValid = myGdalBandXSize - iXBlock * myXBlockSize;
else
nXValid = myXBlockSize;
if (( iYBlock + 1 ) * myYBlockSize > myGdalBandYSize )
nYValid = myGdalBandYSize - iYBlock * myYBlockSize;
else
nYValid = myYBlockSize;
// Collect the histogram counts.
for ( int iY = 0; iY < nYValid; iY++ )
{
for ( int iX = 0; iX < nXValid; iX++ )
{
double myValue = readValue( myData, myDataType, iX + ( iY * myXBlockSize ) );
if ( mValidNoDataValue && ( fabs( myValue - mNoDataValue ) <= TINY_VALUE || myValue != myValue ) )
{
continue; // NULL
}
//only use this element if we have a non null element
if ( myFirstIterationFlag )
{
//this is the first iteration so initialise vars
myFirstIterationFlag = false;
myRasterBandStats.minimumValue = myValue;
myRasterBandStats.maximumValue = myValue;
++myRasterBandStats.elementCount;
} //end of true part for first iteration check
else
{
//this is done for all subsequent iterations
if ( myValue < myRasterBandStats.minimumValue )
{
myRasterBandStats.minimumValue = myValue;
}
if ( myValue > myRasterBandStats.maximumValue )
{
myRasterBandStats.maximumValue = myValue;
}
myRasterBandStats.sum += myValue;
++myRasterBandStats.elementCount;
} //end of false part for first iteration check
}
}
} //end of column wise loop
} //end of row wise loop
//end of first pass through data now calculate the range
myRasterBandStats.range = myRasterBandStats.maximumValue - myRasterBandStats.minimumValue;
//calculate the mean
myRasterBandStats.mean = myRasterBandStats.sum / myRasterBandStats.elementCount;
//for the second pass we will get the sum of the squares / mean
for ( int iYBlock = 0; iYBlock < myNYBlocks; iYBlock++ )
{
emit drawingProgress( iYBlock + myNYBlocks, myNYBlocks * 2 );
for ( int iXBlock = 0; iXBlock < myNXBlocks; iXBlock++ )
{
int nXValid, nYValid;
GDALReadBlock( myGdalBand, iXBlock, iYBlock, myData );
// Compute the portion of the block that is valid
// for partial edge blocks.
if (( iXBlock + 1 ) * myXBlockSize > myGdalBandXSize )
nXValid = myGdalBandXSize - iXBlock * myXBlockSize;
else
nXValid = myXBlockSize;
if (( iYBlock + 1 ) * myYBlockSize > myGdalBandYSize )
nYValid = myGdalBandYSize - iYBlock * myYBlockSize;
else
nYValid = myYBlockSize;
// Collect the histogram counts.
for ( int iY = 0; iY < nYValid; iY++ )
{
for ( int iX = 0; iX < nXValid; iX++ )
{
double myValue = readValue( myData, myDataType, iX + ( iY * myXBlockSize ) );
if ( mValidNoDataValue && ( fabs( myValue - mNoDataValue ) <= TINY_VALUE || myValue != myValue ) )
{
continue; // NULL
}
myRasterBandStats.sumOfSquares += static_cast < double >
( pow( myValue - myRasterBandStats.mean, 2 ) );
}
}
} //end of column wise loop
} //end of row wise loop
//divide result by sample size - 1 and get square root to get stdev
myRasterBandStats.stdDev = static_cast < double >( sqrt( myRasterBandStats.sumOfSquares /
( myRasterBandStats.elementCount - 1 ) ) );
#ifdef QGISDEBUG
QgsLogger::debug( "************ STATS **************", 1, __FILE__, __FUNCTION__, __LINE__ );
QgsLogger::debug( "VALID NODATA", mValidNoDataValue, 1, __FILE__, __FUNCTION__, __LINE__ );
QgsLogger::debug( "NULL", mNoDataValue, 1, __FILE__, __FUNCTION__, __LINE__ );
QgsLogger::debug( "MIN", myRasterBandStats.minimumValue, 1, __FILE__, __FUNCTION__, __LINE__ );
QgsLogger::debug( "MAX", myRasterBandStats.maximumValue, 1, __FILE__, __FUNCTION__, __LINE__ );
QgsLogger::debug( "RANGE", myRasterBandStats.range, 1, __FILE__, __FUNCTION__, __LINE__ );
QgsLogger::debug( "MEAN", myRasterBandStats.mean, 1, __FILE__, __FUNCTION__, __LINE__ );
QgsLogger::debug( "STDDEV", myRasterBandStats.stdDev, 1, __FILE__, __FUNCTION__, __LINE__ );
#endif
CPLFree( myData );
myRasterBandStats.statsGathered = true;
QgsDebugMsg( "adding stats to stats collection at position " + QString::number( theBandNo - 1 ) );
//add this band to the class stats map
mRasterStatsList[theBandNo - 1] = myRasterBandStats;
emit drawingProgress( mHeight, mHeight ); //reset progress
//QApplication::restoreOverrideCursor(); //restore the cursor
QgsDebugMsg( "Stats collection completed returning" );
return myRasterBandStats;
} // QgsRasterLayer::bandStatistics
const QgsRasterBandStats QgsRasterLayer::bandStatistics( QString const & theBandName )
{
//we cant use a vector iterator because the iterator is astruct not a class
//and the qvector model does not like this.
for ( int i = 1; i <= GDALGetRasterCount( mGdalDataset ); i++ )
{
QgsRasterBandStats myRasterBandStats = bandStatistics( i );
if ( myRasterBandStats.bandName == theBandName )
{
return myRasterBandStats;
}
}
return QgsRasterBandStats(); // return a null one
}
/*
* This will speed up performance at the expense of hard drive space.
* Also, write access to the file is required for creating internal pyramids,
* and to the directory in which the files exists if external
* pyramids (.ovr) are to be created. If no parameter is passed in
* it will default to nearest neighbor resampling.
*
* @param theTryInternalFlag - Try to make the pyramids internal if supported (e.g. geotiff). If not supported it will revert to creating external .ovr file anyway.
* @return null string on success, otherwise a string specifying error
*/
QString QgsRasterLayer::buildPyramids( RasterPyramidList const & theRasterPyramidList,
QString const & theResamplingMethod, bool theTryInternalFlag )
{
//TODO: Consider making theRasterPyramidList modifyable by this method to indicate if the pyramid exists after build attempt
//without requiring the user to rebuild the pyramid list to get the updated infomation
//
// Note: Make sure the raster is not opened in write mode
// in order to force overviews to be written to a separate file.
// Otherwise reoopen it in read/write mode to stick overviews
// into the same file (if supported)
//
emit drawingProgress( 0, 0 );
//first test if the file is writeable
QFileInfo myQFile( mDataSource );
if ( !myQFile.isWritable() )
{
return "ERROR_WRITE_ACCESS";
}
if ( mGdalDataset != mGdalBaseDataset )
{
QgsLogger::warning( "Pyramid building not currently supported for 'warped virtual dataset'." );
return "ERROR_VIRTUAL";
}
if ( theTryInternalFlag )
{
// libtiff < 4.0 has a bug that prevents safe building of overviews on JPEG compressed files
// we detect libtiff < 4.0 by checking that BIGTIFF is not in the creation options of the GTiff driver
// see https://trac.osgeo.org/qgis/ticket/1357
const char* pszGTiffCreationOptions =
GDALGetMetadataItem( GDALGetDriverByName( "GTiff" ), GDAL_DMD_CREATIONOPTIONLIST, "" );
if ( strstr( pszGTiffCreationOptions, "BIGTIFF" ) == NULL )
{
QString myCompressionType = QString( GDALGetMetadataItem( mGdalDataset, "COMPRESSION", "IMAGE_STRUCTURE" ) );
if ( "JPEG" == myCompressionType )
{
return "ERROR_JPEG_COMPRESSION";