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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 "qgsspatialrefsys.h"
#include "gdalwarper.h"
#include "cpl_conv.h"
#include "qgspseudocolorshader.h"
#include "qgsfreakoutshader.h"
#include "qgscolorrampshader.h"
#include <cstdio>
#include <cmath>
#include <limits>
#include <iostream>
#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>
// 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);
// std::cerr << "got driver string " << myGdalDriver->GetDescription() << "\n";
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);
// std::cerr << "\t" << *myGdalDriverMetadata << "\n";
// 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 filename appears to be a valid raster file name */
bool QgsRasterLayer::isValidRasterFileName(QString const & theFileNameQString)
{
GDALDatasetH myDataset;
registerGdalDrivers();
//open the file using gdal making sure we have handled locale properly
myDataset = GDALOpen( QFile::encodeName(theFileNameQString).constData(), GA_ReadOnly );
if( myDataset == NULL )
{
return false;
}
else
{
GDALClose(myDataset);
return true;
}
/*
* This way is no longer a good idea because it does not
* cater for filetypes such as grass rasters that dont
* have a predictable file extension.
*
QString name = theFileNameQString.toLower();
return (name.endsWith(".adf") ||
name.endsWith(".asc") ||
name.endsWith(".grd") ||
name.endsWith(".img") ||
name.endsWith(".tif") ||
name.endsWith(".png") ||
name.endsWith(".jpg") ||
name.endsWith(".dem") ||
name.endsWith(".ddf")) ||
name.endsWith(".dt0");
*/
}
//////////////////////////////////////////////////////////
//
// Non Static methods now....
//
/////////////////////////////////////////////////////////
QgsRasterLayer::QgsRasterLayer(
QString const & path,
QString const & baseName,
bool loadDefaultStyleFlag)
: QgsMapLayer(RASTER, baseName, path),
mRasterXDim( std::numeric_limits<int>::max() ),
mRasterYDim( std::numeric_limits<int>::max() ),
mDebugOverlayFlag(false),
mInvertPixelsFlag(false),
mStandardDeviations(0),
mDataProvider(0),
// Constant that signals property not used.
QSTRING_NOT_SET("Not Set"),
TRSTRING_NOT_SET(tr("Not Set"))
{
mUserDefinedRGBMinMaxFlag = false; //defaults needed to bypass stretch
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( 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 getMetadata is called
QgsDebugMsg("Raster initial SRS");
mSRS->debugPrint();
QString mySourceWKT = getProjectionWKT();
QgsDebugMsg("--------------------------------------------------------------------------------------");
QgsDebugMsg("QgsRasterLayer::readFile --- using wkt\n" + mySourceWKT);
QgsDebugMsg("--------------------------------------------------------------------------------------");
mSRS->createFromWkt(mySourceWKT);
//get the project projection, defaulting to this layer's projection
//if none exists....
if (!mSRS->isValid())
{
mSRS->validate();
}
QgsDebugMsg("Raster determined to have the following SRS");
mSRS->debugPrint();
//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");
getMetadata();
// 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.setXmax(myXMax);
// The affine transform reduces to these values at the
// top-left corner of the raster
mLayerExtent.setXmin(mGeoTransform[0]);
mLayerExtent.setYmax(mGeoTransform[3]);
mLayerExtent.setYmin(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);
QString myColorQString = GDALGetColorInterpretationName(GDALGetRasterColorInterpretation(myGdalBand));
QgsRasterBandStats myRasterBandStats;
//myRasterBandStats.bandName = myColorQString ;
myRasterBandStats.bandName=QString::number(i) + " : " + myColorQString;
myRasterBandStats.bandNo = i;
myRasterBandStats.statsGatheredFlag = false;
myRasterBandStats.histogramVector = new QgsRasterBandStats::HistogramVector();
// Read color table
readColorTable ( myGdalBand, &(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", "NO_STRETCH").toString());
//decide what type of layer this is...
//note that multiband images can have one or more 'undefindd' bands,
//so we must do this check first!
if ((GDALGetRasterCount(mGdalDataset) > 1))
{
rasterLayerType = MULTIBAND;
}
else if (hasBand("Palette")) //dont tr() this its a gdal word!
{
rasterLayerType = PALETTE;
}
else
{
rasterLayerType = GRAY_OR_UNDEFINED;
}
if (rasterLayerType == PALETTE)
{
mRedBandName = "Red"; // sensible default
mGreenBandName = "Green"; // sensible default
mBlueBandName = "Blue";// sensible default
mTransparencyBandName = TRSTRING_NOT_SET; // sensible default
mGrayBandName = TRSTRING_NOT_SET; //sensible default
drawingStyle = PALETTED_MULTI_BAND_COLOR; //sensible default
setContrastEnhancementAlgorithm(QgsContrastEnhancement::NO_STRETCH);
}
else if (rasterLayerType == MULTIBAND)
{
//we know we have at least 2 layers...
mRedBandName = getRasterBandName(1); // sensible default
mGreenBandName = getRasterBandName(2); // sensible default
//for the third layer we cant be sure so..
if (GDALGetRasterCount(mGdalDataset) > 2)
{
mBlueBandName = getRasterBandName(3); // sensible default
}
else
{
mBlueBandName = TRSTRING_NOT_SET; // sensible default
}
mTransparencyBandName = TRSTRING_NOT_SET;
mGrayBandName = TRSTRING_NOT_SET; //sensible default
drawingStyle = MULTI_BAND_COLOR; //sensible default
}
else //GRAY_OR_UNDEFINED
{
//Disabled automatically generating stats to improve initial load speed.
//getRasterBandStats(1);
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); // usually gdal will return gray or undefined
}
//mark the layer as valid
mValid=TRUE;
return true;
} // QgsRasterLayer::readFile
QString QgsRasterLayer::getProjectionWKT()
{
QString myWKTString;
QgsSpatialRefSys mySRS;
myWKTString=QString (GDALGetProjectionRef(mGdalDataset));
mySRS.createFromWkt(myWKTString);
if (!mySRS.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()?
// mySRS.createFromWkt(myWKTString);
// if (!mySRS.isValid())
// {
// // use force and make SRS valid!
// mySRS.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("QgsRasterLayer::update");
if ( mLastModified < QgsRasterLayer::lastModified ( source() ) )
{
QgsDebugMsg("Outdated -> reload");
closeDataset();
return readFile ( source() );
}
return true;
}
QDateTime QgsRasterLayer::lastModified ( QString const & name )
{
QgsDebugMsg("QgsRasterLayer::lastModified: " + 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::getDrawingStyleAsQString()
{
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_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_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()
{
QgsDebugMsg("QgsRasterLayer::getPaletteAsPixmap");
// 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") ) //dont tr() this its a gdal word!
)
{
QgsDebugMsg("....found paletted image");
QgsColorTable *myColorTable = colorTable ( 1 );
GDALRasterBandH myGdalBand = GDALGetRasterBand(mGdalDataset,1);
if( GDALGetRasterColorInterpretation(myGdalBand) == GCI_PaletteIndex && myColorTable->defined() )
{
QgsDebugMsg("....found GCI_PaletteIndex");
double myMin = myColorTable->rmin();
double myMax = myColorTable->rmax();
QgsDebugMsg("myMin = " + QString::number(myMin) + " myMax = " + QString::number(myMax));
// 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 = ( myMax - myMin ) / ( mySize * mySize);
for( int myRow = 0; myRow < mySize; myRow++ )
{
for( int myCol = 0; myCol < mySize; myCol++ )
{
double myValue = myMin + myStep * (myCol + myRow * mySize);
int c1, c2, c3;
bool found = myColorTable->color ( myValue, &c1, &c2, &c3 );
if ( found )
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& renderContext)
{
QgsDebugMsg("QgsRasterLayer::draw(4 arguments): entered.");
//Dont waste time drawing if transparency is at 0 (completely transparent)
if (mTransparencyLevel == 0)
return TRUE;
QgsDebugMsg("QgsRasterLayer::draw(4 arguments): checking timestamp.");
// Check timestamp
if ( !update() )
{
return FALSE;
}
const QgsMapToPixel& theQgsMapToPixel = renderContext.mapToPixel();
const QgsRect& theViewExtent = renderContext.extent();
QPainter* theQPainter = renderContext.painter();
if(!theQPainter)
{
return false;
}
// clip raster extent to view extent
QgsRect myRasterExtent = theViewExtent.intersect(&mLayerExtent);
if (myRasterExtent.isEmpty())
{
// nothing to do
return TRUE;
}
#ifdef QGISDEBUG
QgsLogger::debug<QgsRect>("QgsRasterLayer::draw(4 arguments): theViewExtent is ", theViewExtent, __FILE__, __FUNCTION__, __LINE__, 1);
QgsLogger::debug<QgsRect>("QgsRasterLayer::draw(4 arguments): myRasterExtent is ", myRasterExtent, __FILE__, __FUNCTION__, __LINE__, 1);
#endif
//
// 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);
#ifdef QGISDEBUG
QgsLogger::debug("QgsRasterLayer::draw(4 arguments): mGeoTransform[0] = ", mGeoTransform[0], 1, __FILE__,\