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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 "qgscoordinatetransform.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 <QTime>
// typedefs for provider plugin functions of interest
typedef void buildsupportedrasterfilefilter_t( QString & theFileFiltersString );
typedef bool isvalidrasterfilename_t( QString const & theFileNameQString, QString & retErrMsg );
// 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 )
{
QgsDebugMsg( "Entered" );
// TODO, call constructor with provider key for now
init();
setDataProvider( "gdal", QStringList(), QStringList(), QString(), QString(), loadDefaultStyleFlag );
return;
} // QgsRasterLayer ctor
/**
* @todo Rename into a general constructor when the old raster interface is retired
* parameter 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 );
init();
// if we're given a provider type, try to create and bind one to this layer
bool loadDefaultStyleFlag = false ; // ???
setDataProvider( providerKey, layers, styles, format, crs, loadDefaultStyleFlag );
// 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()
{
mValid = false;
delete mRasterShader;
delete mDataProvider;
}
//////////////////////////////////////////////////////////
//
// 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 )
{
QgsDebugMsg( "Entered" );
QLibrary* myLib = QgsRasterLayer::loadProviderLibrary( "gdal" );
if ( !myLib )
{
QgsDebugMsg( "Could not load gdal provider library" );
return;
}
buildsupportedrasterfilefilter_t *pBuild = ( buildsupportedrasterfilefilter_t * ) cast_to_fptr( myLib->resolve( "buildSupportedRasterFileFilter" ) );
if ( ! pBuild )
{
QgsDebugMsg( "Could not resolve buildSupportedRasterFileFilter in gdal provider library" );
return;
}
pBuild( theFileFiltersString );
delete myLib;
}
/**
* 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 )
{
QLibrary* myLib = QgsRasterLayer::loadProviderLibrary( "gdal" );
if ( !myLib )
{
QgsDebugMsg( "Could not load gdal provider library" );
return false;
}
isvalidrasterfilename_t *pValid = ( isvalidrasterfilename_t * ) cast_to_fptr( myLib->resolve( "isValidRasterFileName" ) );
if ( ! pValid )
{
QgsDebugMsg( "Could not resolve isValidRasterFileName in gdal provider library" );
return false;
}
bool myIsValid = pValid( theFileNameQString, retErrMsg );
delete myLib;
return myIsValid;
}
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;
}
// typedef for the QgsDataProvider class factory
typedef QgsDataProvider * classFactoryFunction_t( const QString * );
//////////////////////////////////////////////////////////
//
// 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>
*
* @sa RasterBandStats
* @note This is a cpu intensive and slow task!
*/
const QgsRasterBandStats QgsRasterLayer::bandStatistics( int theBandNo )
{
QgsDebugMsg( "theBandNo = " + QString::number( theBandNo ) );
QgsDebugMsg( "mRasterType = " + QString::number( mRasterType ) );
if ( mRasterType == ColorLayer )
{
// Statistics have no sense for ColorLayer
QgsRasterBandStats myNullReturnStats;
return myNullReturnStats;
}
// check if we have received a valid band number
if (( mDataProvider->bandCount() < 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 ) );
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 );
int myDataType = mDataProvider->dataType( theBandNo );
int myNXBlocks, myNYBlocks, myXBlockSize, myYBlockSize;
myXBlockSize = mDataProvider->xBlockSize();
myYBlockSize = mDataProvider->yBlockSize();
myNXBlocks = ( mDataProvider->xSize() + myXBlockSize - 1 ) / myXBlockSize;
myNYBlocks = ( mDataProvider->ySize() + myYBlockSize - 1 ) / myYBlockSize;
void *myData = CPLMalloc( myXBlockSize * myYBlockSize * ( mDataProvider->dataTypeSize( theBandNo ) / 8 ) );
// unfortunately we need to make two passes through the data to calculate stddev
bool myFirstIterationFlag = true;
int myBandXSize = mDataProvider->xSize();
int myBandYSize = mDataProvider->ySize();
for ( int iYBlock = 0; iYBlock < myNYBlocks; iYBlock++ )
{
emit drawingProgress( iYBlock, myNYBlocks * 2 );
for ( int iXBlock = 0; iXBlock < myNXBlocks; iXBlock++ )
{
int nXValid, nYValid;
mDataProvider->readBlock( theBandNo, iXBlock, iYBlock, myData );
// Compute the portion of the block that is valid
// for partial edge blocks.
if (( iXBlock + 1 ) * myXBlockSize > myBandXSize )
nXValid = myBandXSize - iXBlock * myXBlockSize;
else
nXValid = myXBlockSize;
if (( iYBlock + 1 ) * myYBlockSize > myBandYSize )
nYValid = myBandYSize - 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 ) );
//QgsDebugMsg ( QString ( "%1 %2 value %3" ).arg (iX).arg(iY).arg( myValue ) );
if ( mValidNoDataValue && ( qAbs( myValue - mNoDataValue ) <= TINY_VALUE || myValue != myValue ) )
{
continue; // NULL
}
myRasterBandStats.sum += myValue;
++myRasterBandStats.elementCount;
//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;
} //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;
}
} //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;
mDataProvider->readBlock( theBandNo, iXBlock, iYBlock, myData );
// Compute the portion of the block that is valid
// for partial edge blocks.
if (( iXBlock + 1 ) * myXBlockSize > myBandXSize )
nXValid = myBandXSize - iXBlock * myXBlockSize;
else
nXValid = myXBlockSize;
if (( iYBlock + 1 ) * myYBlockSize > myBandYSize )
nYValid = myBandYSize - 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 ) );
//QgsDebugMsg ( "myValue = " + QString::number(myValue) );
if ( mValidNoDataValue && ( qAbs( 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 <= mDataProvider->bandCount(); i++ )
{
QgsRasterBandStats myRasterBandStats = bandStatistics( i );
if ( myRasterBandStats.bandName == theBandName )
{
return myRasterBandStats;
}
}
return QgsRasterBandStats(); // return a null one
}
QString QgsRasterLayer::buildPyramids( RasterPyramidList const & theRasterPyramidList,
QString const & theResamplingMethod, bool theTryInternalFlag )
{
return mDataProvider->buildPyramids( theRasterPyramidList, theResamplingMethod, theTryInternalFlag );
}
QgsRasterLayer::RasterPyramidList QgsRasterLayer::buildPyramidList()
{
return mDataProvider->buildPyramidList();
}
QString QgsRasterLayer::colorShadingAlgorithmAsString() const
{
switch ( mColorShadingAlgorithm )
{
case PseudoColorShader:
return QString( "PseudoColorShader" );
break;
case FreakOutShader:
return QString( "FreakOutShader" );
break;
case ColorRampShader:
return QString( "ColorRampShader" );
break;
case UserDefinedShader:
return QString( "UserDefinedShader" );
break;
default:
break;
}
return QString( "UndefinedShader" );
}
/**
* @param theBand The band (number) for which to estimate the min max values
* @param theMinMax Pointer to a double[2] which hold the estimated min max
*/
void QgsRasterLayer::computeMinimumMaximumEstimates( int theBand, double* theMinMax )
{
if ( 0 == theMinMax ) { return; }
if ( 0 < theBand && theBand <= ( int ) bandCount() )
{
theMinMax[0] = mDataProvider->minimumValue( theBand );
theMinMax[1] = mDataProvider->maximumValue( theBand );
}
}
/**
* @param theBand The band (name) for which to estimate the min max values
* @param theMinMax Pointer to a double[2] which hold the estimated min max
*/
void QgsRasterLayer::computeMinimumMaximumEstimates( QString theBand, double* theMinMax )
{
computeMinimumMaximumEstimates( bandNumber( theBand ), theMinMax );
}
void QgsRasterLayer::computeMinimumMaximumEstimates( int theBand, double& theMin, double& theMax )
{
double theMinMax[2];
computeMinimumMaximumEstimates( theBand, theMinMax );
theMin = theMinMax[0];
theMax = theMinMax[1];
}
/**
* @param theBand The band (number) for which to calculate the min max values
* @param theMinMax Pointer to a double[2] which hold the estimated min max
*/
void QgsRasterLayer::computeMinimumMaximumFromLastExtent( int theBand, double* theMinMax )
{
if ( 0 == theMinMax ) { return; }
int myDataType = mDataProvider->dataType( theBand );
void* myScanData = readData( theBand, &mLastViewPort );
/* Check for out of memory error */
if ( myScanData == NULL )
{
return;
}
if ( 0 < theBand && theBand <= ( int ) bandCount() )
{
float myMin = std::numeric_limits<float>::max();
float myMax = -1 * std::numeric_limits<float>::max();
float myValue = 0.0;
for ( int myRow = 0; myRow < mLastViewPort.drawableAreaYDim; ++myRow )
{
for ( int myColumn = 0; myColumn < mLastViewPort.drawableAreaXDim; ++myColumn )
{
myValue = readValue( myScanData, myDataType, myRow * mLastViewPort.drawableAreaXDim + myColumn );
if ( mValidNoDataValue && ( qAbs( myValue - mNoDataValue ) <= TINY_VALUE || myValue != myValue ) )
{
continue;
}
myMin = qMin( myMin, myValue );
myMax = qMax( myMax, myValue );
}
}
theMinMax[0] = myMin;
theMinMax[1] = myMax;
}
}
/**
* @param theBand The band (name) for which to calculate the min max values
* @param theMinMax Pointer to a double[2] which hold the estimated min max
*/
void QgsRasterLayer::computeMinimumMaximumFromLastExtent( QString theBand, double* theMinMax )
{
computeMinimumMaximumFromLastExtent( bandNumber( theBand ), theMinMax );
}
void QgsRasterLayer::computeMinimumMaximumFromLastExtent( int theBand, double& theMin, double& theMax )
{
double theMinMax[2];
computeMinimumMaximumFromLastExtent( theBand, theMinMax );
theMin = theMinMax[0];
theMax = theMinMax[1];
}
/**
* @param theBand The band (number) for which to get the contrast enhancement for
* @return Pointer to the contrast enhancement or 0 on failure
*/
QgsContrastEnhancement* QgsRasterLayer::contrastEnhancement( unsigned int theBand )
{
if ( 0 < theBand && theBand <= bandCount() )
{
return &mContrastEnhancementList[theBand - 1];
}
return 0;
}
QString QgsRasterLayer::contrastEnhancementAlgorithmAsString() const
{
switch ( mContrastEnhancementAlgorithm )
{
case QgsContrastEnhancement::NoEnhancement:
return QString( "NoEnhancement" );
break;
case QgsContrastEnhancement::StretchToMinimumMaximum:
return QString( "StretchToMinimumMaximum" );
break;
case QgsContrastEnhancement::StretchAndClipToMinimumMaximum:
return QString( "StretchAndClipToMinimumMaximum" );
break;
case QgsContrastEnhancement::ClipToMinimumMaximum:
return QString( "ClipToMinimumMaximum" );
break;
case QgsContrastEnhancement::UserDefinedEnhancement:
return QString( "UserDefined" );
break;
}
return QString( "NoEnhancement" );
}
/**
* @note Note implemented yet
* @return always returns false
*/
bool QgsRasterLayer::copySymbologySettings( const QgsMapLayer& theOther )
{
//preventwarnings
if ( theOther.type() < 0 )
{
return false;
}
return false;
} //todo
/**
* @param theBandNo the band number
* @return pointer to the color table
*/
QList<QgsColorRampShader::ColorRampItem>* QgsRasterLayer::colorTable( int theBandNo )
{
return &( mRasterStatsList[theBandNo-1].colorTable );
}
/**
* @return 0 if not using the data provider model (i.e. directly using GDAL)
*/
QgsRasterDataProvider* QgsRasterLayer::dataProvider()
{
return mDataProvider;
}
/**
* @return 0 if not using the data provider model (i.e. directly using GDAL)
*/
const QgsRasterDataProvider* QgsRasterLayer::dataProvider() const
{
return mDataProvider;
}
void QgsRasterLayer::reload()
{
if ( mDataProvider )
{
mDataProvider->reloadData();
}
}
bool QgsRasterLayer::draw( QgsRenderContext& rendererContext )
{
QgsDebugMsg( "entered. (renderContext)" );
// Don't waste time drawing if transparency is at 0 (completely transparent)
if ( mTransparencyLevel == 0 )
return true;
QgsDebugMsg( "checking timestamp." );
// Check timestamp
if ( !update() )
{
return false;
}
const QgsMapToPixel& theQgsMapToPixel = rendererContext.mapToPixel();
const QgsRectangle& theViewExtent = rendererContext.extent();
QgsRectangle myProjectedViewExtent;
QgsRectangle myProjectedLayerExtent;
if ( rendererContext.coordinateTransform() )
{
QgsDebugMsg( "coordinateTransform set -> project extents." );
myProjectedViewExtent = rendererContext.coordinateTransform()->transformBoundingBox(
rendererContext.extent() );
myProjectedLayerExtent = rendererContext.coordinateTransform()->transformBoundingBox(
mLayerExtent );
}
else
{
QgsDebugMsg( "coordinateTransform not set" );
myProjectedViewExtent = rendererContext.extent();
myProjectedLayerExtent = mLayerExtent;
}
QPainter* theQPainter = rendererContext.painter();
if ( !theQPainter )
{
return false;
}
// clip raster extent to view extent
//QgsRectangle myRasterExtent = theViewExtent.intersect( &mLayerExtent );
QgsRectangle myRasterExtent = myProjectedViewExtent.intersect( &myProjectedLayerExtent );
if ( myRasterExtent.isEmpty() )
{
QgsDebugMsg( "draw request outside view extent." );
// nothing to do
return true;
}
QgsDebugMsg( "theViewExtent is " + theViewExtent.toString() );
QgsDebugMsg( "myProjectedViewExtent is " + myProjectedViewExtent.toString() );
QgsDebugMsg( "myProjectedLayerExtent is " + myProjectedLayerExtent.toString() );
QgsDebugMsg( "myRasterExtent is " + myRasterExtent.toString() );
//
// The first thing we do is set up the QgsRasterViewPort. This struct stores all the settings
// relating to the size (in pixels and coordinate system units) of the raster part that is
// in view in the map window. It also stores the origin.
//
//this is not a class level member because every time the user pans or zooms
//the contents of the rasterViewPort will change
QgsRasterViewPort *myRasterViewPort = new QgsRasterViewPort();
myRasterViewPort->mDrawnExtent = myRasterExtent;
if ( rendererContext.coordinateTransform() )
{
myRasterViewPort->mSrcCRS = crs();
myRasterViewPort->mDestCRS = rendererContext.coordinateTransform()->destCRS();
}
else
{
myRasterViewPort->mSrcCRS = QgsCoordinateReferenceSystem(); // will be invalid
myRasterViewPort->mDestCRS = QgsCoordinateReferenceSystem(); // will be invalid
}
// get dimensions of clipped raster image in device coordinate space (this is the size of the viewport)
myRasterViewPort->topLeftPoint = theQgsMapToPixel.transform( myRasterExtent.xMinimum(), myRasterExtent.yMaximum() );
myRasterViewPort->bottomRightPoint = theQgsMapToPixel.transform( myRasterExtent.xMaximum(), myRasterExtent.yMinimum() );
// align to output device grid, i.e. floor/ceil to integers
// TODO: this should only be done if paint device is raster - screen, image
// for other devices (pdf) it can have floating point origin
// we could use floating point for raster devices as well, but respecting the
// output device grid should make it more effective as the resampling is done in
// the provider anyway
if ( true )
{
myRasterViewPort->topLeftPoint.setX( floor( myRasterViewPort->topLeftPoint.x() ) );
myRasterViewPort->topLeftPoint.setY( floor( myRasterViewPort->topLeftPoint.y() ) );
myRasterViewPort->bottomRightPoint.setX( ceil( myRasterViewPort->bottomRightPoint.x() ) );
myRasterViewPort->bottomRightPoint.setY( ceil( myRasterViewPort->bottomRightPoint.y() ) );
// recalc myRasterExtent to aligned values
myRasterExtent.set(
theQgsMapToPixel.toMapCoordinatesF( myRasterViewPort->topLeftPoint.x(),
myRasterViewPort->bottomRightPoint.y() ),
theQgsMapToPixel.toMapCoordinatesF( myRasterViewPort->bottomRightPoint.x(),
myRasterViewPort->topLeftPoint.y() )
);
}
myRasterViewPort->drawableAreaXDim = static_cast<int>( qAbs(( myRasterExtent.width() / theQgsMapToPixel.mapUnitsPerPixel() ) ) );
myRasterViewPort->drawableAreaYDim = static_cast<int>( qAbs(( myRasterExtent.height() / theQgsMapToPixel.mapUnitsPerPixel() ) ) );
//the drawable area can start to get very very large when you get down displaying 2x2 or smaller, this is becasue
//theQgsMapToPixel.mapUnitsPerPixel() is less then 1,
//so we will just get the pixel data and then render these special cases differently in paintImageToCanvas()
#if 0
if ( 2 >= myRasterViewPort->clippedWidth && 2 >= myRasterViewPort->clippedHeight )
{
myRasterViewPort->drawableAreaXDim = myRasterViewPort->clippedWidth;
myRasterViewPort->drawableAreaYDim = myRasterViewPort->clippedHeight;
}
#endif
QgsDebugMsgLevel( QString( "mapUnitsPerPixel = %1" ).arg( theQgsMapToPixel.mapUnitsPerPixel() ), 3 );
QgsDebugMsgLevel( QString( "mWidth = %1" ).arg( mWidth ), 3 );
QgsDebugMsgLevel( QString( "mHeight = %1" ).arg( mHeight ), 3 );
QgsDebugMsgLevel( QString( "myRasterExtent.xMinimum() = %1" ).arg( myRasterExtent.xMinimum() ), 3 );
QgsDebugMsgLevel( QString( "myRasterExtent.xMaximum() = %1" ).arg( myRasterExtent.xMaximum() ), 3 );
QgsDebugMsgLevel( QString( "myRasterExtent.yMinimum() = %1" ).arg( myRasterExtent.yMinimum() ), 3 );
QgsDebugMsgLevel( QString( "myRasterExtent.yMaximum() = %1" ).arg( myRasterExtent.yMaximum() ), 3 );
QgsDebugMsgLevel( QString( "topLeftPoint.x() = %1" ).arg( myRasterViewPort->topLeftPoint.x() ), 3 );
QgsDebugMsgLevel( QString( "bottomRightPoint.x() = %1" ).arg( myRasterViewPort->bottomRightPoint.x() ), 3 );
QgsDebugMsgLevel( QString( "topLeftPoint.y() = %1" ).arg( myRasterViewPort->topLeftPoint.y() ), 3 );
QgsDebugMsgLevel( QString( "bottomRightPoint.y() = %1" ).arg( myRasterViewPort->bottomRightPoint.y() ), 3 );
QgsDebugMsgLevel( QString( "drawableAreaXDim = %1" ).arg( myRasterViewPort->drawableAreaXDim ), 3 );
QgsDebugMsgLevel( QString( "drawableAreaYDim = %1" ).arg( myRasterViewPort->drawableAreaYDim ), 3 );
QgsDebugMsgLevel( "ReadXml: gray band name : " + mGrayBandName, 3 );
QgsDebugMsgLevel( "ReadXml: red band name : " + mRedBandName, 3 );
QgsDebugMsgLevel( "ReadXml: green band name : " + mGreenBandName, 3 );
QgsDebugMsgLevel( "ReadXml: blue band name : " + mBlueBandName, 3 );
// /\/\/\ - added to handle zoomed-in rasters
mLastViewPort = *myRasterViewPort;
// Provider mode: See if a provider key is specified, and if so use the provider instead
draw( theQPainter, myRasterViewPort, &theQgsMapToPixel );
delete myRasterViewPort;
QgsDebugMsg( "exiting." );
return true;
}
void QgsRasterLayer::draw( QPainter * theQPainter,
QgsRasterViewPort * theRasterViewPort,
const QgsMapToPixel* theQgsMapToPixel )
{
QgsDebugMsg( " 3 arguments" );
QTime time;
time.start();
//
//
// The goal here is to make as many decisions as possible early on (outside of the rendering loop)
// so that we can maximise performance of the rendering process. So now we check which drawing
// procedure to use :
//
QgsDebugMsg( "mDrawingStyle = " + QString::number( mDrawingStyle ) );
switch ( mDrawingStyle )
{
// a "Gray" or "Undefined" layer drawn as a range of gray colors
case SingleBandGray:
//check the band is set!
if ( mGrayBandName == TRSTRING_NOT_SET )
{
break;
}
else
{
drawSingleBandGray( theQPainter, theRasterViewPort,
theQgsMapToPixel, bandNumber( mGrayBandName ) );
break;
}
// a "Gray" or "Undefined" layer drawn using a pseudocolor algorithm
case SingleBandPseudoColor:
//check the band is set!
if ( mGrayBandName == TRSTRING_NOT_SET )
{
break;
}
else
{
drawSingleBandPseudoColor( theQPainter, theRasterViewPort,
theQgsMapToPixel, bandNumber( mGrayBandName ) );
break;
}
// a single band with a color map
case PalettedColor:
//check the band is set!
if ( mGrayBandName == TRSTRING_NOT_SET )
{
break;
}
else
{
QgsDebugMsg( "PalettedColor drawing type detected..." );
drawPalettedSingleBandColor( theQPainter, theRasterViewPort,
theQgsMapToPixel, bandNumber( mGrayBandName ) );
break;
}
// a "Palette" layer drawn in gray scale (using only one of the color components)
case PalettedSingleBandGray:
//check the band is set!
if ( mGrayBandName == TRSTRING_NOT_SET )
{
break;
}
else
{
QgsDebugMsg( "PalettedSingleBandGray drawing type detected..." );
int myBandNo = 1;
drawPalettedSingleBandGray( theQPainter, theRasterViewPort,
theQgsMapToPixel, myBandNo );
break;
}
// a "Palette" layer having only one of its color components rendered as psuedo color
case PalettedSingleBandPseudoColor:
//check the band is set!
if ( mGrayBandName == TRSTRING_NOT_SET )
{
break;
}
else
{
int myBandNo = 1;
drawPalettedSingleBandPseudoColor( theQPainter, theRasterViewPort,
theQgsMapToPixel, myBandNo );
break;
}