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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 "qgsrasterviewport.h"
#include "qgsrect.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
//////////////////////////////////////////////////////////
//
// Static Methods and members first....
//
/////////////////////////////////////////////////////////
/**
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, welll, 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.
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;
// 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 )
{
jp2Driver = myGdalDriver; // first JP2 driver found
glob += " *.j2k"; // add alternate extension
}
else break; // skip if already found a JP2 driver
}
theFileFiltersString += 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 += myGdalDriverLongName + " (" + glob.toLower() + " " + glob.toUpper() + ");;";
}
else if ( myGdalDriverDescription.startsWith( "DTED" ) )
{
// DTED use "*.dt0"
QString glob = "*.dt0";
theFileFiltersString += myGdalDriverLongName + " (" + glob.toLower() + " " + glob.toUpper() + ");;";
}
else if ( myGdalDriverDescription.startsWith( "MrSID" ) )
{
// MrSID use "*.sid"
QString glob = "*.sid";
theFileFiltersString += myGdalDriverLongName + " (" + glob.toLower() + " " + glob.toUpper() + ");;";
}
else
{
catchallFilter << QString( GDALGetDescription( myGdalDriver ) );
}
}
myGdalDriverExtension = myGdalDriverLongName = ""; // reset for next driver
} // each loaded GDAL driver
// can't forget the default case
theFileFiltersString += catchallFilter.join( ", " ) + " " + tr( "and all other files" ) + " (*)";
QgsDebugMsg( "Raster filter list built: " + theFileFiltersString );
} // buildSupportedRasterFileFilter_()
/**
ensures that GDAL drivers are registered, but only once.
*/
void QgsRasterLayer::registerGdalDrivers()
{
if ( GDALGetDriverCount() == 0 )
GDALAllRegister();
}
/** 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 = CPLGetLastErrorMsg();
return false;
}
else if ( GDALGetRasterCount( myDataset ) == 0 )
{
GDALClose( myDataset );
myDataset = NULL;
retErrMsg = "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 );
}
//////////////////////////////////////////////////////////
//
// Non Static methods now....
//
/////////////////////////////////////////////////////////
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" ) ),
mRasterXDim( std::numeric_limits<int>::max() ),
mRasterYDim( std::numeric_limits<int>::max() ),
mInvertPixelsFlag( false ),
mStandardDeviations( 0 ),
mDataProvider( 0 )
{
mUserDefinedRGBMinMaxFlag = false; //defaults needed to bypass enhanceContrast
mUserDefinedGrayMinMaxFlag = false;
mRGBActualMinimumMaximum = false;
mGrayActualMinimumMaximum = false;
mRasterShader = new QgsRasterShader();
if ( loadDefaultStyleFlag )
{
bool defaultLoadedFlag = false;
loadDefaultStyle( defaultLoadedFlag );
if ( defaultLoadedFlag )
{
return;
}
}
// 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?
}
} // QgsRasterLayer ctor
QgsRasterLayer::~QgsRasterLayer()
{
if ( mProviderKey.isEmpty() )
{
if ( mGdalBaseDataset )
{
GDALDereferenceDataset( mGdalBaseDataset );
GDALClose( mGdalDataset );
}
}
}
bool QgsRasterLayer::readFile( QString const & fileName )
{
registerGdalDrivers();
mGdalDataset = NULL;
//open the dataset making sure we handle char encoding of locale properly
mGdalBaseDataset = GDALOpen( QFile::encodeName( fileName ).constData(), GA_ReadOnly );
if ( mGdalBaseDataset == NULL )
{
mValid = FALSE;
return false;
}
// Store timestamp
mLastModified = lastModified( fileName );
// 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 f this file has pyramids
GDALRasterBandH myGDALBand = GDALGetRasterBand( mGdalDataset, 1 ); //just use the first band
if ( myGDALBand == NULL )
{
GDALDereferenceDataset( mGdalBaseDataset );
mGdalBaseDataset = NULL;
GDALClose( mGdalDataset );
mGdalDataset = NULL;
mValid = FALSE;
return false;
}
if ( GDALGetOverviewCount( myGDALBand ) > 0 )
{
hasPyramidsFlag = true;
}
else
{
hasPyramidsFlag = false;
}
//populate the list of what pyramids exist
buildRasterPyramidList();
// Get the layer's projection info and set up the
// QgsCoordinateTransform for this layer
// NOTE: we must do this before metadata is called
QString mySourceWkt = getProjectionWkt();
QgsDebugMsg( "--------------------------------------------------------------------------------------" );
QgsDebugMsg( "using wkt:\n" + mySourceWkt );
QgsDebugMsg( "--------------------------------------------------------------------------------------" );
mCRS->createFromWkt( mySourceWkt );
//get the project projection, defaulting to this layer's projection
//if none exists....
if ( !mCRS->isValid() )
{
mCRS->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 zzooming 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];
mLayerExtent.setXMaximum( myXMax );
// The affine transform reduces to these values at the
// top-left corner of the raster
mLayerExtent.setXMinimum( mGeoTransform[0] );
mLayerExtent.setYMaximum( mGeoTransform[3] );
mLayerExtent.setYMinimum( myYMin );
//
// Set up the x and y dimensions of this raster layer
//
mRasterXDim = GDALGetRasterXSize( mGdalDataset );
mRasterYDim = GDALGetRasterYSize( mGdalDataset );
//
// Determin the nodatavalue
//
mNoDataValue = -9999; //Standard default?
mValidNoDataValue = false;
int isValid = false;
double myNoDataValue = GDALGetRasterNoDataValue( GDALGetRasterBand( mGdalDataset, 1 ), &isValid );
if ( isValid )
{
mNoDataValue = myNoDataValue;
mValidNoDataValue = true;
}
if ( mValidNoDataValue )
{
mRasterTransparency.initializeTransparentPixelList( mNoDataValue, mNoDataValue, mNoDataValue );
mRasterTransparency.initializeTransparentPixelList( mNoDataValue );
}
//initialise the raster band stats and contrast enhancement vector
for ( int i = 1; i <= GDALGetRasterCount( mGdalDataset ); i++ )
{
GDALRasterBandH myGdalBand = GDALGetRasterBand( mGdalDataset, i );
QgsRasterBandStats myRasterBandStats;
//myRasterBandStats.bandName = myColorQString ;
myRasterBandStats.bandName = "Band " + QString::number( i );
myRasterBandStats.bandNumber = i;
myRasterBandStats.statsGathered = false;
myRasterBandStats.histogramVector = new QgsRasterBandStats::HistogramVector();
//Store the default color table
readColorTable( i, &myRasterBandStats.colorTable );
mRasterStatsList.push_back( myRasterBandStats );
//Build a new contrast enhancement for the band and store in list
QgsContrastEnhancement myContrastEnhancement(( QgsContrastEnhancement::QgsRasterDataType )GDALGetRasterDataType( myGdalBand ) );
mContrastEnhancementList.append( myContrastEnhancement );
}
//defaults - Needs to be set after the Contrast list has been build
//Try to read the default contrast enhancement from the config file
QSettings myQSettings;
setContrastEnhancementAlgorithm( myQSettings.value( "/Raster/defaultContrastEnhancementAlgorithm", "STRETCH_TO_MINMAX" ).toString() );
//decide what type of layer this is...
//TODO Change this to look at the color interp and palette interp to decide which type of layer it is
if (( GDALGetRasterCount( mGdalDataset ) > 1 ) )
{
rasterLayerType = MULTIBAND;
}
//TODO hasBand is really obsolete and only used in the Palette instance, change to new function hasPalette(int)
else if ( hasBand( "Palette" ) ) //dont tr() this its a gdal word!
{
rasterLayerType = PALETTE;
}
else
{
rasterLayerType = GRAY_OR_UNDEFINED;
}
if ( rasterLayerType == PALETTE )
{
mRedBandName = TRSTRING_NOT_SET; // sensible default
mGreenBandName = TRSTRING_NOT_SET; // sensible default
mBlueBandName = TRSTRING_NOT_SET;// sensible default
mTransparencyBandName = TRSTRING_NOT_SET; // sensible default
mGrayBandName = getRasterBandName( 1 ); //sensible default
QgsDebugMsg( mGrayBandName );
drawingStyle = PALETTED_COLOR; //sensible default
//Set up a new color ramp shader
setColorShadingAlgorithm( COLOR_RAMP );
QgsColorRampShader* myColorRampShader = ( QgsColorRampShader* ) mRasterShader->rasterShaderFunction();
myColorRampShader->setColorRampType( QgsColorRampShader::INTERPOLATED );
myColorRampShader->setColorRampItemList( *getColorTable( 1 ) );
}
else if ( rasterLayerType == MULTIBAND )
{
//we know we have at least 2 layers...
mRedBandName = getRasterBandName( myQSettings.value( "/Raster/defaultRedBand", 1 ).toInt() ); // sensible default
mGreenBandName = getRasterBandName( myQSettings.value( "/Raster/defaultGreenBand", 2 ).toInt() ); // sensible default
//for the third layer we cant be sure so..
if ( GDALGetRasterCount( mGdalDataset ) > 2 )
{
mBlueBandName = getRasterBandName( myQSettings.value( "/Raster/defaultBlueBand", 3 ).toInt() ); // sensible default
}
else
{
mBlueBandName = getRasterBandName( myQSettings.value( "/Raster/defaultBlueBand", 2 ).toInt() ); // sensible default
}
mTransparencyBandName = TRSTRING_NOT_SET;
mGrayBandName = TRSTRING_NOT_SET; //sensible default
drawingStyle = MULTI_BAND_COLOR; //sensible default
}
else //GRAY_OR_UNDEFINED
{
mRedBandName = TRSTRING_NOT_SET; //sensible default
mGreenBandName = TRSTRING_NOT_SET; //sensible default
mBlueBandName = TRSTRING_NOT_SET; //sensible default
mTransparencyBandName = TRSTRING_NOT_SET; //sensible default
drawingStyle = SINGLE_BAND_GRAY; //sensible default
mGrayBandName = getRasterBandName( 1 );
}
//mark the layer as valid
mValid = TRUE;
return true;
} // QgsRasterLayer::readFile
QString QgsRasterLayer::getProjectionWkt()
{
QString myWktString;
QgsCoordinateReferenceSystem myCRS;
myWktString = QString( GDALGetProjectionRef( mGdalDataset ) );
myCRS.createFromWkt( myWktString );
if ( !myCRS.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();
// }
}
return myWktString;
}
void QgsRasterLayer::closeDataset()
{
if ( !mValid ) return;
mValid = FALSE;
GDALDereferenceDataset( mGdalBaseDataset );
mGdalBaseDataset = NULL;
GDALClose( mGdalDataset );
mGdalDataset = NULL;
hasPyramidsFlag = false;
mPyramidList.clear();
mRasterStatsList.clear();
}
bool QgsRasterLayer::update()
{
QgsDebugMsg( "entered." );
if ( mLastModified < QgsRasterLayer::lastModified( source() ) )
{
QgsDebugMsg( "Outdated -> reload" );
closeDataset();
return readFile( source() );
}
return true;
}
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();
// Check also color table for GRASS
if ( name.contains( "cellhd" ) > 0 )
{ // most probably GRASS
QString dir = fi.path();
QString map = fi.fileName();
fi.setFile( dir + "/../colr/" + map );
if ( fi.exists() )
{
if ( fi.lastModified() > t ) t = fi.lastModified();
}
}
// Check GRASS group members (bands)
if ( name.contains( "group" ) > 0 )
{ // probably GRASS group
fi.setFile( name + "/REF" );
if ( fi.exists() )
{ // most probably GRASS group
QFile f( name + "/REF" );
if ( f.open( QIODevice::ReadOnly ) )
{
QString dir = fi.path() + "/../../../";
char buf[101];
while ( f.readLine( buf, 100 ) != -1 )
{
QString ln = QString( buf );
QStringList sl = ln.trimmed().split( ' ', QString::SkipEmptyParts );
QString map = sl.first();
sl.pop_front();
QString mapset = sl.first();
// header
fi.setFile( dir + mapset + "/cellhd/" + map );
if ( fi.exists() )
{
if ( fi.lastModified() > t ) t = fi.lastModified();
}
// color
fi.setFile( dir + mapset + "/colr/" + map );
if ( fi.exists() )
{
if ( fi.lastModified() > t ) t = fi.lastModified();
}
}
}
}
}
QgsDebugMsg( "last modified = " + t.toString() );
return t;
}
// emit a signal asking for a repaint
void QgsRasterLayer::triggerRepaint()
{
emit repaintRequested();
}
QString QgsRasterLayer::getDrawingStyleAsString() const
{
switch ( drawingStyle )
{
case SINGLE_BAND_GRAY:
return QString( "SINGLE_BAND_GRAY" ); //no need to tr() this its not shown in ui
break;
case SINGLE_BAND_PSEUDO_COLOR:
return QString( "SINGLE_BAND_PSEUDO_COLOR" );//no need to tr() this its not shown in ui
break;
case PALETTED_COLOR:
return QString( "PALETTED_COLOR" );//no need to tr() this its not shown in ui
break;
case PALETTED_SINGLE_BAND_GRAY:
return QString( "PALETTED_SINGLE_BAND_GRAY" );//no need to tr() this its not shown in ui
break;
case PALETTED_SINGLE_BAND_PSEUDO_COLOR:
return QString( "PALETTED_SINGLE_BAND_PSEUDO_COLOR" );//no need to tr() this its not shown in ui
break;
case PALETTED_MULTI_BAND_COLOR:
return QString( "PALETTED_MULTI_BAND_COLOR" );//no need to tr() this its not shown in ui
break;
case MULTI_BAND_SINGLE_BAND_GRAY:
return QString( "MULTI_BAND_SINGLE_BAND_GRAY" );//no need to tr() this its not shown in ui
break;
case MULTI_BAND_SINGLE_BAND_PSEUDO_COLOR:
return QString( "MULTI_BAND_SINGLE_BAND_PSEUDO_COLOR" );//no need to tr() this its not shown in ui
break;
case MULTI_BAND_COLOR:
return QString( "MULTI_BAND_COLOR" );//no need to tr() this its not shown in ui
break;
default:
break;
}
return QString( "UNDEFINED_DRAWING_STYLE" );
}
void QgsRasterLayer::setDrawingStyle( QString const & theDrawingStyleQString )
{
if ( theDrawingStyleQString == "SINGLE_BAND_GRAY" )//no need to tr() this its not shown in ui
{
drawingStyle = SINGLE_BAND_GRAY;
}
else if ( theDrawingStyleQString == "SINGLE_BAND_PSEUDO_COLOR" )//no need to tr() this its not shown in ui
{
drawingStyle = SINGLE_BAND_PSEUDO_COLOR;
}
else if ( theDrawingStyleQString == "PALETTED_COLOR" )//no need to tr() this its not shown in ui
{
drawingStyle = PALETTED_COLOR;
}
else if ( theDrawingStyleQString == "PALETTED_SINGLE_BAND_GRAY" )//no need to tr() this its not shown in ui
{
drawingStyle = PALETTED_SINGLE_BAND_GRAY;
}
else if ( theDrawingStyleQString == "PALETTED_SINGLE_BAND_PSEUDO_COLOR" )//no need to tr() this its not shown in ui
{
drawingStyle = PALETTED_SINGLE_BAND_PSEUDO_COLOR;
}
else if ( theDrawingStyleQString == "PALETTED_MULTI_BAND_COLOR" )//no need to tr() this its not shown in ui
{
drawingStyle = PALETTED_MULTI_BAND_COLOR;
}
else if ( theDrawingStyleQString == "MULTI_BAND_SINGLE_BAND_GRAY" )//no need to tr() this its not shown in ui
{
drawingStyle = MULTI_BAND_SINGLE_BAND_GRAY;
}
else if ( theDrawingStyleQString == "MULTI_BAND_SINGLE_BAND_PSEUDO_COLOR" )//no need to tr() this its not shown in ui
{
drawingStyle = MULTI_BAND_SINGLE_BAND_PSEUDO_COLOR;
}
else if ( theDrawingStyleQString == "MULTI_BAND_COLOR" )//no need to tr() this its not shown in ui
{
drawingStyle = MULTI_BAND_COLOR;
}
else
{
drawingStyle = UNDEFINED_DRAWING_STYLE;
}
}
/** This method looks to see if a given band name exists.
@note
muliband layers may have more than one "Undefined" band!
*/
bool QgsRasterLayer::hasBand( QString const & theBandName )
{
QgsDebugMsg( "Looking for band : " + theBandName );
for ( int i = 1; i <= GDALGetRasterCount( mGdalDataset ); i++ )
{
GDALRasterBandH myGdalBand = GDALGetRasterBand( mGdalDataset, i );
QString myColorQString = GDALGetColorInterpretationName( GDALGetRasterColorInterpretation( myGdalBand ) );
#ifdef QGISDEBUG
QgsLogger::debug( "band", i, __FILE__, __FUNCTION__, __LINE__, 2 );
#endif
if ( myColorQString == theBandName )
{
#ifdef QGISDEBUG
QgsLogger::debug( "band", i, __FILE__, __FUNCTION__, __LINE__, 2 );
QgsDebugMsgLevel( "Found band : " + theBandName, 2 );
#endif
return true;
}
QgsDebugMsgLevel( "Found unmatched band : " + QString::number( i ) + " " + myColorQString, 2 );
}
return false;
}
void QgsRasterLayer::drawThumbnail( QPixmap * theQPixmap )
{
theQPixmap->fill(); //defaults to white
// Raster providers are disabled (for the moment)
if ( mProviderKey.isEmpty() )
{
QgsRasterViewPort *myRasterViewPort = new QgsRasterViewPort();
myRasterViewPort->rectXOffset = 0;
myRasterViewPort->rectYOffset = 0;
myRasterViewPort->clippedXMin = 0;
myRasterViewPort->clippedXMax = mRasterXDim;
myRasterViewPort->clippedYMin = mRasterYDim;
myRasterViewPort->clippedYMax = 0;
myRasterViewPort->clippedWidth = mRasterXDim;
myRasterViewPort->clippedHeight = mRasterYDim;
myRasterViewPort->topLeftPoint = QgsPoint( 0, 0 );
myRasterViewPort->bottomRightPoint = QgsPoint( theQPixmap->width(), theQPixmap->height() );
myRasterViewPort->drawableAreaXDim = theQPixmap->width();
myRasterViewPort->drawableAreaYDim = theQPixmap->height();
QPainter * myQPainter = new QPainter( theQPixmap );
draw( myQPainter, myRasterViewPort );
delete myRasterViewPort;
myQPainter->end();
delete myQPainter;
}
}
QPixmap QgsRasterLayer::getPaletteAsPixmap( int theBandNumber )
{
QgsDebugMsg( "entered." );
// Only do this for the non-provider (hard-coded GDAL) scenario...
// Maybe WMS can do this differently using QImage::numColors and QImage::color()
if ( mProviderKey.isEmpty() && hasBand( "Palette" ) && theBandNumber > 0 ) //dont tr() this its a gdal word!
{
QgsDebugMsg( "....found paletted image" );
QgsColorRampShader myShader;
QList<QgsColorRampShader::ColorRampItem> myColorRampItemList = myShader.colorRampItemList();
if ( readColorTable( 1, &myColorRampItemList ) )
{
QgsDebugMsg( "....got color ramp item list" );
myShader.setColorRampItemList( myColorRampItemList );
myShader.setColorRampType( QgsColorRampShader::DISCRETE );
// Draw image
int mySize = 100;
QPixmap myPalettePixmap( mySize, mySize );
QPainter myQPainter( &myPalettePixmap );
QImage myQImage = QImage( mySize, mySize, QImage::Format_RGB32 );
myQImage.fill( 0 );
myPalettePixmap.fill();
double myStep = (( double )myColorRampItemList.size() - 1 ) / ( double )( mySize * mySize );
double myValue = 0.0;
for ( int myRow = 0; myRow < mySize; myRow++ )
{
for ( int myCol = 0; myCol < mySize; myCol++ )
{
myValue = myStep * ( double )( myCol + myRow * mySize );
int c1, c2, c3;
myShader.shade( myValue, &c1, &c2, &c3 );
myQImage.setPixel( myCol, myRow, qRgb( c1, c2, c3 ) );
}
}
myQPainter.drawImage( 0, 0, myQImage );
return myPalettePixmap;
}
QPixmap myNullPixmap;
return myNullPixmap;
}
else
{
//invalid layer was requested
QPixmap myNullPixmap;
return myNullPixmap;
}
}
bool QgsRasterLayer::draw( QgsRenderContext& rendererContext )
{
QgsDebugMsg( "entered. (renderContext)" );
//Dont 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 QgsRect& theViewExtent = rendererContext.extent();
QPainter* theQPainter = rendererContext.painter();
if ( !theQPainter )
{
return false;
}
// clip raster extent to view extent
QgsRect myRasterExtent = theViewExtent.intersect( &mLayerExtent );
if ( myRasterExtent.isEmpty() )
{
// nothing to do
return TRUE;
}
QgsDebugMsg( "theViewExtent is " + theViewExtent.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();
// calculate raster pixel offsets from origin to clipped rect
// we're only interested in positive offsets where the origin of the raster
// is northwest of the origin of the view
myRasterViewPort->rectXOffsetFloat = ( theViewExtent.xMin() - mLayerExtent.xMin() ) / fabs( mGeoTransform[1] );
myRasterViewPort->rectYOffsetFloat = ( mLayerExtent.yMax() - theViewExtent.yMax() ) / fabs( mGeoTransform[5] );
if ( myRasterViewPort->rectXOffsetFloat < 0 )
{
myRasterViewPort->rectXOffsetFloat = 0;
}
if ( myRasterViewPort->rectYOffsetFloat < 0 )
{
myRasterViewPort->rectYOffsetFloat = 0;
}
myRasterViewPort->rectXOffset = static_cast < int >( myRasterViewPort->rectXOffsetFloat );
myRasterViewPort->rectYOffset = static_cast < int >( myRasterViewPort->rectYOffsetFloat );
QgsDebugMsg( QString( "mGeoTransform[0] = %1" ).arg( mGeoTransform[0] ) );