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qgsrasterprojector.cpp
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qgsrasterprojector.cpp
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/***************************************************************************
qgsrasterprojector.cpp - Raster projector
--------------------------------------
Date : Jan 16, 2011
Copyright : (C) 2005 by Radim Blazek
email : radim dot blazek at gmail dot com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include <algorithm>
#include "qgsrasterdataprovider.h"
#include "qgscrscache.h"
#include "qgslogger.h"
#include "qgsrasterprojector.h"
#include "qgscoordinatetransform.h"
QgsRasterProjector::QgsRasterProjector(
const QgsCoordinateReferenceSystem& theSrcCRS,
const QgsCoordinateReferenceSystem& theDestCRS,
int theSrcDatumTransform,
int theDestDatumTransform,
const QgsRectangle& theDestExtent,
int theDestRows, int theDestCols,
double theMaxSrcXRes, double theMaxSrcYRes,
const QgsRectangle& theExtent )
: QgsRasterInterface( nullptr )
, mSrcCRS( theSrcCRS )
, mDestCRS( theDestCRS )
, mSrcDatumTransform( theSrcDatumTransform )
, mDestDatumTransform( theDestDatumTransform )
, mDestExtent( theDestExtent )
, mExtent( theExtent )
, mDestRows( theDestRows ), mDestCols( theDestCols )
, pHelperTop( nullptr ), pHelperBottom( nullptr )
, mMaxSrcXRes( theMaxSrcXRes ), mMaxSrcYRes( theMaxSrcYRes )
, mPrecision( Approximate )
, mApproximate( true )
{
QgsDebugMsgLevel( "Entered", 4 );
QgsDebugMsgLevel( "theDestExtent = " + theDestExtent.toString(), 4 );
calc();
}
QgsRasterProjector::QgsRasterProjector(
const QgsCoordinateReferenceSystem& theSrcCRS,
const QgsCoordinateReferenceSystem& theDestCRS,
const QgsRectangle& theDestExtent,
int theDestRows, int theDestCols,
double theMaxSrcXRes, double theMaxSrcYRes,
const QgsRectangle& theExtent )
: QgsRasterInterface( nullptr )
, mSrcCRS( theSrcCRS )
, mDestCRS( theDestCRS )
, mSrcDatumTransform( -1 )
, mDestDatumTransform( -1 )
, mDestExtent( theDestExtent )
, mExtent( theExtent )
, mDestRows( theDestRows ), mDestCols( theDestCols )
, pHelperTop( nullptr ), pHelperBottom( nullptr )
, mMaxSrcXRes( theMaxSrcXRes ), mMaxSrcYRes( theMaxSrcYRes )
, mPrecision( Approximate )
, mApproximate( false )
{
QgsDebugMsgLevel( "Entered", 4 );
QgsDebugMsgLevel( "theDestExtent = " + theDestExtent.toString(), 4 );
calc();
}
QgsRasterProjector::QgsRasterProjector(
const QgsCoordinateReferenceSystem& theSrcCRS,
const QgsCoordinateReferenceSystem& theDestCRS,
double theMaxSrcXRes, double theMaxSrcYRes,
const QgsRectangle& theExtent )
: QgsRasterInterface( nullptr )
, mSrcCRS( theSrcCRS )
, mDestCRS( theDestCRS )
, mSrcDatumTransform( -1 )
, mDestDatumTransform( -1 )
, mExtent( theExtent )
, mDestRows( 0 )
, mDestCols( 0 )
, mDestXRes( 0.0 )
, mDestYRes( 0.0 )
, mSrcRows( 0 )
, mSrcCols( 0 )
, mSrcXRes( 0.0 )
, mSrcYRes( 0.0 )
, mDestRowsPerMatrixRow( 0.0 )
, mDestColsPerMatrixCol( 0.0 )
, pHelperTop( nullptr ), pHelperBottom( nullptr )
, mHelperTopRow( 0 )
, mCPCols( 0 )
, mCPRows( 0 )
, mSqrTolerance( 0.0 )
, mMaxSrcXRes( theMaxSrcXRes )
, mMaxSrcYRes( theMaxSrcYRes )
, mPrecision( Approximate )
, mApproximate( false )
{
QgsDebugMsgLevel( "Entered", 4 );
}
QgsRasterProjector::QgsRasterProjector()
: QgsRasterInterface( nullptr )
, mSrcDatumTransform( -1 )
, mDestDatumTransform( -1 )
, mDestRows( 0 )
, mDestCols( 0 )
, mDestXRes( 0.0 )
, mDestYRes( 0.0 )
, mSrcRows( 0 )
, mSrcCols( 0 )
, mSrcXRes( 0.0 )
, mSrcYRes( 0.0 )
, mDestRowsPerMatrixRow( 0.0 )
, mDestColsPerMatrixCol( 0.0 )
, pHelperTop( nullptr )
, pHelperBottom( nullptr )
, mHelperTopRow( 0 )
, mCPCols( 0 )
, mCPRows( 0 )
, mSqrTolerance( 0.0 )
, mMaxSrcXRes( 0 )
, mMaxSrcYRes( 0 )
, mPrecision( Approximate )
, mApproximate( false )
{
QgsDebugMsgLevel( "Entered", 4 );
}
QgsRasterProjector::QgsRasterProjector( const QgsRasterProjector &projector )
: QgsRasterInterface( nullptr )
, pHelperTop( nullptr )
, pHelperBottom( nullptr )
, mHelperTopRow( 0 )
, mCPCols( 0 )
, mCPRows( 0 )
, mSqrTolerance( 0 )
, mApproximate( false )
{
mSrcCRS = projector.mSrcCRS;
mDestCRS = projector.mDestCRS;
mSrcDatumTransform = projector.mSrcDatumTransform;
mDestDatumTransform = projector.mDestDatumTransform;
mMaxSrcXRes = projector.mMaxSrcXRes;
mMaxSrcYRes = projector.mMaxSrcYRes;
mExtent = projector.mExtent;
mDestRows = projector.mDestRows;
mDestCols = projector.mDestCols;
mDestXRes = projector.mDestXRes;
mDestYRes = projector.mDestYRes;
mSrcRows = projector.mSrcRows;
mSrcCols = projector.mSrcCols;
mSrcXRes = projector.mSrcXRes;
mSrcYRes = projector.mSrcYRes;
mDestRowsPerMatrixRow = projector.mDestRowsPerMatrixRow;
mDestColsPerMatrixCol = projector.mDestColsPerMatrixCol;
mPrecision = projector.mPrecision;
}
QgsRasterProjector & QgsRasterProjector::operator=( const QgsRasterProjector & projector )
{
if ( &projector != this )
{
mSrcCRS = projector.mSrcCRS;
mDestCRS = projector.mDestCRS;
mSrcDatumTransform = projector.mSrcDatumTransform;
mDestDatumTransform = projector.mDestDatumTransform;
mMaxSrcXRes = projector.mMaxSrcXRes;
mMaxSrcYRes = projector.mMaxSrcYRes;
mExtent = projector.mExtent;
mPrecision = projector.mPrecision;
}
return *this;
}
QgsRasterProjector* QgsRasterProjector::clone() const
{
QgsDebugMsgLevel( "Entered", 4 );
QgsRasterProjector * projector = new QgsRasterProjector( mSrcCRS, mDestCRS, mMaxSrcXRes, mMaxSrcYRes, mExtent );
projector->mSrcDatumTransform = mSrcDatumTransform;
projector->mDestDatumTransform = mDestDatumTransform;
projector->mPrecision = mPrecision;
return projector;
}
QgsRasterProjector::~QgsRasterProjector()
{
delete[] pHelperTop;
delete[] pHelperBottom;
}
int QgsRasterProjector::bandCount() const
{
if ( mInput ) return mInput->bandCount();
return 0;
}
QGis::DataType QgsRasterProjector::dataType( int bandNo ) const
{
if ( mInput ) return mInput->dataType( bandNo );
return QGis::UnknownDataType;
}
void QgsRasterProjector::setCRS( const QgsCoordinateReferenceSystem & theSrcCRS, const QgsCoordinateReferenceSystem & theDestCRS, int srcDatumTransform, int destDatumTransform )
{
mSrcCRS = theSrcCRS;
mDestCRS = theDestCRS;
mSrcDatumTransform = srcDatumTransform;
mDestDatumTransform = destDatumTransform;
}
void QgsRasterProjector::calc()
{
QgsDebugMsgLevel( "Entered", 4 );
mCPMatrix.clear();
mCPLegalMatrix.clear();
delete[] pHelperTop;
pHelperTop = nullptr;
delete[] pHelperBottom;
pHelperBottom = nullptr;
// Get max source resolution and extent if possible
mMaxSrcXRes = 0;
mMaxSrcYRes = 0;
if ( mInput )
{
QgsRasterDataProvider *provider = dynamic_cast<QgsRasterDataProvider*>( mInput->srcInput() );
if ( provider )
{
if ( provider->capabilities() & QgsRasterDataProvider::Size )
{
mMaxSrcXRes = provider->extent().width() / provider->xSize();
mMaxSrcYRes = provider->extent().height() / provider->ySize();
}
// Get source extent
if ( mExtent.isEmpty() )
{
mExtent = provider->extent();
}
}
}
mDestXRes = mDestExtent.width() / ( mDestCols );
mDestYRes = mDestExtent.height() / ( mDestRows );
// Calculate tolerance
// TODO: Think it over better
// Note: we are checking on matrix each even point, that means that the real error
// in that moment is approximately half size
double myDestRes = mDestXRes < mDestYRes ? mDestXRes : mDestYRes;
mSqrTolerance = myDestRes * myDestRes;
const QgsCoordinateTransform* inverseCt = QgsCoordinateTransformCache::instance()->transform( mDestCRS.authid(), mSrcCRS.authid(), mDestDatumTransform, mSrcDatumTransform );
if ( mPrecision == Approximate )
{
mApproximate = true;
}
else
{
mApproximate = false;
}
// Always try to calculate mCPMatrix, it is used in calcSrcExtent() for both Approximate and Exact
// Initialize the matrix by corners and middle points
mCPCols = mCPRows = 3;
for ( int i = 0; i < mCPRows; i++ )
{
QList<QgsPoint> myRow;
myRow.append( QgsPoint() );
myRow.append( QgsPoint() );
myRow.append( QgsPoint() );
mCPMatrix.insert( i, myRow );
// And the legal points
QList<bool> myLegalRow;
myLegalRow.append( bool( false ) );
myLegalRow.append( bool( false ) );
myLegalRow.append( bool( false ) );
mCPLegalMatrix.insert( i, myLegalRow );
}
for ( int i = 0; i < mCPRows; i++ )
{
calcRow( i, inverseCt );
}
while ( true )
{
bool myColsOK = checkCols( inverseCt );
if ( !myColsOK )
{
insertRows( inverseCt );
}
bool myRowsOK = checkRows( inverseCt );
if ( !myRowsOK )
{
insertCols( inverseCt );
}
if ( myColsOK && myRowsOK )
{
QgsDebugMsgLevel( "CP matrix within tolerance", 4 );
break;
}
// What is the maximum reasonable size of transformatio matrix?
// TODO: consider better when to break - ratio
if ( mCPRows * mCPCols > 0.25 * mDestRows * mDestCols )
//if ( mCPRows * mCPCols > mDestRows * mDestCols )
{
QgsDebugMsgLevel( "Too large CP matrix", 4 );
mApproximate = false;
break;
}
}
QgsDebugMsgLevel( QString( "CPMatrix size: mCPRows = %1 mCPCols = %2" ).arg( mCPRows ).arg( mCPCols ), 4 );
mDestRowsPerMatrixRow = static_cast< float >( mDestRows ) / ( mCPRows - 1 );
mDestColsPerMatrixCol = static_cast< float >( mDestCols ) / ( mCPCols - 1 );
QgsDebugMsgLevel( "CPMatrix:", 5 );
QgsDebugMsgLevel( cpToString(), 5 );
// init helper points
pHelperTop = new QgsPoint[mDestCols];
pHelperBottom = new QgsPoint[mDestCols];
calcHelper( 0, pHelperTop );
calcHelper( 1, pHelperBottom );
mHelperTopRow = 0;
// Calculate source dimensions
calcSrcExtent();
calcSrcRowsCols();
mSrcYRes = mSrcExtent.height() / mSrcRows;
mSrcXRes = mSrcExtent.width() / mSrcCols;
}
void QgsRasterProjector::calcSrcExtent()
{
/* Run around the mCPMatrix and find source extent */
// Attention, source limits are not necessarily on destination edges, e.g.
// for destination EPSG:32661 Polar Stereographic and source EPSG:4326,
// the maximum y may be in the middle of destination extent
// TODO: How to find extent exactly and quickly?
// For now, we run through all matrix
// mCPMatrix is used for both Approximate and Exact because QgsCoordinateTransform::transformBoundingBox()
// is not precise enough, see #13665
QgsPoint myPoint = mCPMatrix[0][0];
mSrcExtent = QgsRectangle( myPoint.x(), myPoint.y(), myPoint.x(), myPoint.y() );
for ( int i = 0; i < mCPRows; i++ )
{
for ( int j = 0; j < mCPCols ; j++ )
{
myPoint = mCPMatrix[i][j];
if ( mCPLegalMatrix[i][j] )
{
mSrcExtent.combineExtentWith( myPoint.x(), myPoint.y() );
}
}
}
// Expand a bit to avoid possible approx coords falling out because of representation error?
// Combine with maximum source extent
mSrcExtent = mSrcExtent.intersect( &mExtent );
// If mMaxSrcXRes, mMaxSrcYRes are defined (fixed src resolution)
// align extent to src resolution to avoid jumping of reprojected pixels
// when shifting resampled grid.
// Important especially if we are over mMaxSrcXRes, mMaxSrcYRes limits
// Note however, that preceding filters (like resampler) may read data
// on different resolution.
QgsDebugMsgLevel( "mSrcExtent = " + mSrcExtent.toString(), 4 );
QgsDebugMsgLevel( "mExtent = " + mExtent.toString(), 4 );
if ( !mExtent.isEmpty() )
{
if ( mMaxSrcXRes > 0 )
{
// with floor/ceil it should work correctly also for mSrcExtent.xMinimum() < mExtent.xMinimum()
double col = floor(( mSrcExtent.xMinimum() - mExtent.xMinimum() ) / mMaxSrcXRes );
double x = mExtent.xMinimum() + col * mMaxSrcXRes;
mSrcExtent.setXMinimum( x );
col = ceil(( mSrcExtent.xMaximum() - mExtent.xMinimum() ) / mMaxSrcXRes );
x = mExtent.xMinimum() + col * mMaxSrcXRes;
mSrcExtent.setXMaximum( x );
}
if ( mMaxSrcYRes > 0 )
{
double row = floor(( mExtent.yMaximum() - mSrcExtent.yMaximum() ) / mMaxSrcYRes );
double y = mExtent.yMaximum() - row * mMaxSrcYRes;
mSrcExtent.setYMaximum( y );
row = ceil(( mExtent.yMaximum() - mSrcExtent.yMinimum() ) / mMaxSrcYRes );
y = mExtent.yMaximum() - row * mMaxSrcYRes;
mSrcExtent.setYMinimum( y );
}
}
QgsDebugMsgLevel( "mSrcExtent = " + mSrcExtent.toString(), 4 );
}
QString QgsRasterProjector::cpToString()
{
QString myString;
for ( int i = 0; i < mCPRows; i++ )
{
if ( i > 0 )
myString += '\n';
for ( int j = 0; j < mCPCols; j++ )
{
if ( j > 0 )
myString += " ";
QgsPoint myPoint = mCPMatrix[i][j];
if ( mCPLegalMatrix[i][j] )
{
myString += myPoint.toString();
}
else
{
myString += "(-,-)";
}
}
}
return myString;
}
void QgsRasterProjector::calcSrcRowsCols()
{
// Wee need to calculate minimum cell size in the source
// TODO: Think it over better, what is the right source resolution?
// Taking distances between cell centers projected to source along source
// axis would result in very high resolution
// TODO: different resolution for rows and cols ?
double myMinSize = std::numeric_limits<double>::max();
if ( mApproximate )
{
// For now, we take cell sizes projected to source but not to source axes
double myDestColsPerMatrixCell = static_cast< double >( mDestCols ) / mCPCols;
double myDestRowsPerMatrixCell = static_cast< double >( mDestRows ) / mCPRows;
QgsDebugMsgLevel( QString( "myDestColsPerMatrixCell = %1 myDestRowsPerMatrixCell = %2" ).arg( myDestColsPerMatrixCell ).arg( myDestRowsPerMatrixCell ), 4 );
for ( int i = 0; i < mCPRows - 1; i++ )
{
for ( int j = 0; j < mCPCols - 1; j++ )
{
QgsPoint myPointA = mCPMatrix[i][j];
QgsPoint myPointB = mCPMatrix[i][j+1];
QgsPoint myPointC = mCPMatrix[i+1][j];
if ( mCPLegalMatrix[i][j] && mCPLegalMatrix[i][j+1] && mCPLegalMatrix[i+1][j] )
{
double mySize = sqrt( myPointA.sqrDist( myPointB ) ) / myDestColsPerMatrixCell;
if ( mySize < myMinSize )
myMinSize = mySize;
mySize = sqrt( myPointA.sqrDist( myPointC ) ) / myDestRowsPerMatrixCell;
if ( mySize < myMinSize )
myMinSize = mySize;
}
}
}
}
else
{
// take highest from corners, points in in the middle of corners and center (3 x 3 )
const QgsCoordinateTransform* inverseCt = QgsCoordinateTransformCache::instance()->transform( mDestCRS.authid(), mSrcCRS.authid(), mDestDatumTransform, mSrcDatumTransform );
//double
QgsRectangle srcExtent;
int srcXSize, srcYSize;
if ( extentSize( inverseCt, mDestExtent, mDestCols, mDestRows, srcExtent, srcXSize, srcYSize ) )
{
double srcXRes = srcExtent.width() / srcXSize;
double srcYRes = srcExtent.height() / srcYSize;
myMinSize = std::min( srcXRes, srcYRes );
}
else
{
QgsDebugMsg( "Cannot get src extent/size" );
}
}
// Make it a bit higher resolution
// TODO: find the best coefficient, attention, increasing resolution for WMS
// is changing WMS content
myMinSize *= 0.75;
QgsDebugMsgLevel( QString( "mMaxSrcXRes = %1 mMaxSrcYRes = %2" ).arg( mMaxSrcXRes ).arg( mMaxSrcYRes ), 4 );
// mMaxSrcXRes, mMaxSrcYRes may be 0 - no limit (WMS)
double myMinXSize = mMaxSrcXRes > myMinSize ? mMaxSrcXRes : myMinSize;
double myMinYSize = mMaxSrcYRes > myMinSize ? mMaxSrcYRes : myMinSize;
QgsDebugMsgLevel( QString( "myMinXSize = %1 myMinYSize = %2" ).arg( myMinXSize ).arg( myMinYSize ), 4 );
QgsDebugMsgLevel( QString( "mSrcExtent.width = %1 mSrcExtent.height = %2" ).arg( mSrcExtent.width() ).arg( mSrcExtent.height() ), 4 );
// we have to round to keep alignment set in calcSrcExtent
mSrcRows = static_cast< int >( qRound( mSrcExtent.height() / myMinYSize ) );
mSrcCols = static_cast< int >( qRound( mSrcExtent.width() / myMinXSize ) );
QgsDebugMsgLevel( QString( "mSrcRows = %1 mSrcCols = %2" ).arg( mSrcRows ).arg( mSrcCols ), 4 );
}
inline void QgsRasterProjector::destPointOnCPMatrix( int theRow, int theCol, double *theX, double *theY )
{
*theX = mDestExtent.xMinimum() + theCol * mDestExtent.width() / ( mCPCols - 1 );
*theY = mDestExtent.yMaximum() - theRow * mDestExtent.height() / ( mCPRows - 1 );
}
inline int QgsRasterProjector::matrixRow( int theDestRow )
{
return static_cast< int >( floor(( theDestRow + 0.5 ) / mDestRowsPerMatrixRow ) );
}
inline int QgsRasterProjector::matrixCol( int theDestCol )
{
return static_cast< int >( floor(( theDestCol + 0.5 ) / mDestColsPerMatrixCol ) );
}
QgsPoint QgsRasterProjector::srcPoint( int theDestRow, int theCol )
{
Q_UNUSED( theDestRow );
Q_UNUSED( theCol );
return QgsPoint();
}
void QgsRasterProjector::calcHelper( int theMatrixRow, QgsPoint *thePoints )
{
// TODO?: should we also precalc dest cell center coordinates for x and y?
for ( int myDestCol = 0; myDestCol < mDestCols; myDestCol++ )
{
double myDestX = mDestExtent.xMinimum() + ( myDestCol + 0.5 ) * mDestXRes;
int myMatrixCol = matrixCol( myDestCol );
double myDestXMin, myDestYMin, myDestXMax, myDestYMax;
destPointOnCPMatrix( theMatrixRow, myMatrixCol, &myDestXMin, &myDestYMin );
destPointOnCPMatrix( theMatrixRow, myMatrixCol + 1, &myDestXMax, &myDestYMax );
double xfrac = ( myDestX - myDestXMin ) / ( myDestXMax - myDestXMin );
QgsPoint &mySrcPoint0 = mCPMatrix[theMatrixRow][myMatrixCol];
QgsPoint &mySrcPoint1 = mCPMatrix[theMatrixRow][myMatrixCol+1];
double s = mySrcPoint0.x() + ( mySrcPoint1.x() - mySrcPoint0.x() ) * xfrac;
double t = mySrcPoint0.y() + ( mySrcPoint1.y() - mySrcPoint0.y() ) * xfrac;
thePoints[myDestCol].setX( s );
thePoints[myDestCol].setY( t );
}
}
void QgsRasterProjector::nextHelper()
{
// We just switch pHelperTop and pHelperBottom, memory is not lost
QgsPoint *tmp;
tmp = pHelperTop;
pHelperTop = pHelperBottom;
pHelperBottom = tmp;
calcHelper( mHelperTopRow + 2, pHelperBottom );
mHelperTopRow++;
}
bool QgsRasterProjector::srcRowCol( int theDestRow, int theDestCol, int *theSrcRow, int *theSrcCol, const QgsCoordinateTransform* ct )
{
if ( mApproximate )
{
return approximateSrcRowCol( theDestRow, theDestCol, theSrcRow, theSrcCol );
}
else
{
return preciseSrcRowCol( theDestRow, theDestCol, theSrcRow, theSrcCol, ct );
}
}
bool QgsRasterProjector::preciseSrcRowCol( int theDestRow, int theDestCol, int *theSrcRow, int *theSrcCol, const QgsCoordinateTransform* ct )
{
#ifdef QGISDEBUG
QgsDebugMsgLevel( QString( "theDestRow = %1" ).arg( theDestRow ), 5 );
QgsDebugMsgLevel( QString( "theDestRow = %1 mDestExtent.yMaximum() = %2 mDestYRes = %3" ).arg( theDestRow ).arg( mDestExtent.yMaximum() ).arg( mDestYRes ), 5 );
#endif
// Get coordinate of center of destination cell
double x = mDestExtent.xMinimum() + ( theDestCol + 0.5 ) * mDestXRes;
double y = mDestExtent.yMaximum() - ( theDestRow + 0.5 ) * mDestYRes;
double z = 0;
#ifdef QGISDEBUG
QgsDebugMsgLevel( QString( "x = %1 y = %2" ).arg( x ).arg( y ), 5 );
#endif
if ( ct )
{
ct->transformInPlace( x, y, z );
}
#ifdef QGISDEBUG
QgsDebugMsgLevel( QString( "x = %1 y = %2" ).arg( x ).arg( y ), 5 );
#endif
if ( !mExtent.contains( QgsPoint( x, y ) ) )
{
return false;
}
// Get source row col
*theSrcRow = static_cast< int >( floor(( mSrcExtent.yMaximum() - y ) / mSrcYRes ) );
*theSrcCol = static_cast< int >( floor(( x - mSrcExtent.xMinimum() ) / mSrcXRes ) );
#ifdef QGISDEBUG
QgsDebugMsgLevel( QString( "mSrcExtent.yMinimum() = %1 mSrcExtent.yMaximum() = %2 mSrcYRes = %3" ).arg( mSrcExtent.yMinimum() ).arg( mSrcExtent.yMaximum() ).arg( mSrcYRes ), 5 );
QgsDebugMsgLevel( QString( "theSrcRow = %1 theSrcCol = %2" ).arg( *theSrcRow ).arg( *theSrcCol ), 5 );
#endif
// With epsg 32661 (Polar Stereographic) it was happening that *theSrcCol == mSrcCols
// For now silently correct limits to avoid crashes
// TODO: review
// should not happen
if ( *theSrcRow >= mSrcRows ) return false;
if ( *theSrcRow < 0 ) return false;
if ( *theSrcCol >= mSrcCols ) return false;
if ( *theSrcCol < 0 ) return false;
return true;
}
bool QgsRasterProjector::approximateSrcRowCol( int theDestRow, int theDestCol, int *theSrcRow, int *theSrcCol )
{
int myMatrixRow = matrixRow( theDestRow );
int myMatrixCol = matrixCol( theDestCol );
if ( myMatrixRow > mHelperTopRow )
{
// TODO: make it more robust (for random, not sequential reading)
nextHelper();
}
double myDestY = mDestExtent.yMaximum() - ( theDestRow + 0.5 ) * mDestYRes;
// See the schema in javax.media.jai.WarpGrid doc (but up side down)
// TODO: use some kind of cache of values which can be reused
double myDestXMin, myDestYMin, myDestXMax, myDestYMax;
destPointOnCPMatrix( myMatrixRow + 1, myMatrixCol, &myDestXMin, &myDestYMin );
destPointOnCPMatrix( myMatrixRow, myMatrixCol + 1, &myDestXMax, &myDestYMax );
double yfrac = ( myDestY - myDestYMin ) / ( myDestYMax - myDestYMin );
QgsPoint &myTop = pHelperTop[theDestCol];
QgsPoint &myBot = pHelperBottom[theDestCol];
// Warning: this is very SLOW compared to the following code!:
//double mySrcX = myBot.x() + (myTop.x() - myBot.x()) * yfrac;
//double mySrcY = myBot.y() + (myTop.y() - myBot.y()) * yfrac;
double tx = myTop.x();
double ty = myTop.y();
double bx = myBot.x();
double by = myBot.y();
double mySrcX = bx + ( tx - bx ) * yfrac;
double mySrcY = by + ( ty - by ) * yfrac;
if ( !mExtent.contains( QgsPoint( mySrcX, mySrcY ) ) )
{
return false;
}
// TODO: check again cell selection (coor is in the middle)
*theSrcRow = static_cast< int >( floor(( mSrcExtent.yMaximum() - mySrcY ) / mSrcYRes ) );
*theSrcCol = static_cast< int >( floor(( mySrcX - mSrcExtent.xMinimum() ) / mSrcXRes ) );
// For now silently correct limits to avoid crashes
// TODO: review
// should not happen
if ( *theSrcRow >= mSrcRows ) return false;
if ( *theSrcRow < 0 ) return false;
if ( *theSrcCol >= mSrcCols ) return false;
if ( *theSrcCol < 0 ) return false;
return true;
}
void QgsRasterProjector::insertRows( const QgsCoordinateTransform* ct )
{
for ( int r = 0; r < mCPRows - 1; r++ )
{
QList<QgsPoint> myRow;
QList<bool> myLegalRow;
myRow.reserve( mCPCols );
myLegalRow.reserve( mCPCols );
for ( int c = 0; c < mCPCols; ++c )
{
myRow.append( QgsPoint() );
myLegalRow.append( false );
}
QgsDebugMsgLevel( QString( "insert new row at %1" ).arg( 1 + r*2 ), 3 );
mCPMatrix.insert( 1 + r*2, myRow );
mCPLegalMatrix.insert( 1 + r*2, myLegalRow );
}
mCPRows += mCPRows - 1;
for ( int r = 1; r < mCPRows - 1; r += 2 )
{
calcRow( r, ct );
}
}
void QgsRasterProjector::insertCols( const QgsCoordinateTransform* ct )
{
for ( int r = 0; r < mCPRows; r++ )
{
for ( int c = 0; c < mCPCols - 1; c++ )
{
mCPMatrix[r].insert( 1 + c*2, QgsPoint() );
mCPLegalMatrix[r].insert( 1 + c*2, false );
}
}
mCPCols += mCPCols - 1;
for ( int c = 1; c < mCPCols - 1; c += 2 )
{
calcCol( c, ct );
}
}
void QgsRasterProjector::calcCP( int theRow, int theCol, const QgsCoordinateTransform* ct )
{
double myDestX, myDestY;
destPointOnCPMatrix( theRow, theCol, &myDestX, &myDestY );
QgsPoint myDestPoint( myDestX, myDestY );
try
{
if ( ct )
{
mCPMatrix[theRow][theCol] = ct->transform( myDestPoint );
mCPLegalMatrix[theRow][theCol] = true;
}
else
{
mCPLegalMatrix[theRow][theCol] = false;
}
}
catch ( QgsCsException &e )
{
Q_UNUSED( e );
// Caught an error in transform
mCPLegalMatrix[theRow][theCol] = false;
}
}
bool QgsRasterProjector::calcRow( int theRow, const QgsCoordinateTransform* ct )
{
QgsDebugMsgLevel( QString( "theRow = %1" ).arg( theRow ), 3 );
for ( int i = 0; i < mCPCols; i++ )
{
calcCP( theRow, i, ct );
}
return true;
}
bool QgsRasterProjector::calcCol( int theCol, const QgsCoordinateTransform* ct )
{
QgsDebugMsgLevel( QString( "theCol = %1" ).arg( theCol ), 3 );
for ( int i = 0; i < mCPRows; i++ )
{
calcCP( i, theCol, ct );
}
return true;
}
bool QgsRasterProjector::checkCols( const QgsCoordinateTransform* ct )
{
if ( !ct )
{
return false;
}
for ( int c = 0; c < mCPCols; c++ )
{
for ( int r = 1; r < mCPRows - 1; r += 2 )
{
double myDestX, myDestY;
destPointOnCPMatrix( r, c, &myDestX, &myDestY );
QgsPoint myDestPoint( myDestX, myDestY );
QgsPoint mySrcPoint1 = mCPMatrix[r-1][c];
QgsPoint mySrcPoint2 = mCPMatrix[r][c];
QgsPoint mySrcPoint3 = mCPMatrix[r+1][c];
QgsPoint mySrcApprox(( mySrcPoint1.x() + mySrcPoint3.x() ) / 2, ( mySrcPoint1.y() + mySrcPoint3.y() ) / 2 );
if ( !mCPLegalMatrix[r-1][c] || !mCPLegalMatrix[r][c] || !mCPLegalMatrix[r+1][c] )
{
// There was an error earlier in transform, just abort
return false;
}
try
{
QgsPoint myDestApprox = ct->transform( mySrcApprox, QgsCoordinateTransform::ReverseTransform );
double mySqrDist = myDestApprox.sqrDist( myDestPoint );
if ( mySqrDist > mSqrTolerance )
{
return false;
}
}
catch ( QgsCsException &e )
{
Q_UNUSED( e );
// Caught an error in transform
return false;
}
}
}
return true;
}
bool QgsRasterProjector::checkRows( const QgsCoordinateTransform* ct )
{
if ( !ct )
{
return false;
}
for ( int r = 0; r < mCPRows; r++ )
{
for ( int c = 1; c < mCPCols - 1; c += 2 )
{
double myDestX, myDestY;
destPointOnCPMatrix( r, c, &myDestX, &myDestY );
QgsPoint myDestPoint( myDestX, myDestY );
QgsPoint mySrcPoint1 = mCPMatrix[r][c-1];
QgsPoint mySrcPoint2 = mCPMatrix[r][c];
QgsPoint mySrcPoint3 = mCPMatrix[r][c+1];
QgsPoint mySrcApprox(( mySrcPoint1.x() + mySrcPoint3.x() ) / 2, ( mySrcPoint1.y() + mySrcPoint3.y() ) / 2 );
if ( !mCPLegalMatrix[r][c-1] || !mCPLegalMatrix[r][c] || !mCPLegalMatrix[r][c+1] )
{
// There was an error earlier in transform, just abort
return false;
}
try
{
QgsPoint myDestApprox = ct->transform( mySrcApprox, QgsCoordinateTransform::ReverseTransform );
double mySqrDist = myDestApprox.sqrDist( myDestPoint );
if ( mySqrDist > mSqrTolerance )
{
return false;
}
}
catch ( QgsCsException &e )
{
Q_UNUSED( e );
// Caught an error in transform
return false;
}
}
}
return true;
}
QString QgsRasterProjector::precisionLabel( Precision precision )
{
switch ( precision )
{
case Approximate:
return tr( "Approximate" );
case Exact:
return tr( "Exact" );
}
return "Unknown";
}
QgsRasterBlock * QgsRasterProjector::block( int bandNo, QgsRectangle const & extent, int width, int height )
{
QgsDebugMsgLevel( QString( "extent:\n%1" ).arg( extent.toString() ), 4 );
QgsDebugMsgLevel( QString( "width = %1 height = %2" ).arg( width ).arg( height ), 4 );
if ( !mInput )
{
QgsDebugMsgLevel( "Input not set", 4 );
return new QgsRasterBlock();
}
if ( ! mSrcCRS.isValid() || ! mDestCRS.isValid() || mSrcCRS == mDestCRS )
{
QgsDebugMsgLevel( "No projection necessary", 4 );
return mInput->block( bandNo, extent, width, height );
}
mDestExtent = extent;
mDestRows = height;
mDestCols = width;
calc();
QgsDebugMsgLevel( QString( "srcExtent:\n%1" ).arg( srcExtent().toString() ), 4 );
QgsDebugMsgLevel( QString( "srcCols = %1 srcRows = %2" ).arg( srcCols() ).arg( srcRows() ), 4 );
// If we zoom out too much, projector srcRows / srcCols maybe 0, which can cause problems in providers
if ( srcRows() <= 0 || srcCols() <= 0 )
{
QgsDebugMsgLevel( "Zero srcRows or srcCols", 4 );
return new QgsRasterBlock();
}
QgsRasterBlock *inputBlock = mInput->block( bandNo, srcExtent(), srcCols(), srcRows() );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return new QgsRasterBlock();
}
qgssize pixelSize = QgsRasterBlock::typeSize( mInput->dataType( bandNo ) );
QgsRasterBlock *outputBlock;
if ( inputBlock->hasNoDataValue() )
{
outputBlock = new QgsRasterBlock( inputBlock->dataType(), width, height, inputBlock->noDataValue() );
}
else
{
outputBlock = new QgsRasterBlock( inputBlock->dataType(), width, height );
}
if ( !outputBlock->isValid() )
{
QgsDebugMsg( "Cannot create block" );
delete inputBlock;
return outputBlock;
}
// set output to no data, it should be fast
outputBlock->setIsNoData();
// No data: because isNoData()/setIsNoData() is slow with respect to simple memcpy,
// we use if only if necessary:
// 1) no data value exists (numerical) -> memcpy, not necessary isNoData()/setIsNoData()
// 2) no data value does not exist but it may contain no data (numerical no data bitmap)
// -> must use isNoData()/setIsNoData()
// 3) no data are not used (no no data value, no no data bitmap) -> simple memcpy
// 4) image - simple memcpy
// To copy no data values stored in bitmaps we have to use isNoData()/setIsNoData(),
// we cannot fill output block with no data because we use memcpy for data, not setValue().
bool doNoData = !QgsRasterBlock::typeIsNumeric( inputBlock->dataType() ) && inputBlock->hasNoData() && !inputBlock->hasNoDataValue();
const QgsCoordinateTransform* inverseCt = nullptr;
if ( !mApproximate )
{
inverseCt = QgsCoordinateTransformCache::instance()->transform( mDestCRS.authid(), mSrcCRS.authid(), mDestDatumTransform, mSrcDatumTransform );
}
outputBlock->setIsNoData();
int srcRow, srcCol;
for ( int i = 0; i < height; ++i )
{
for ( int j = 0; j < width; ++j )
{
bool inside = srcRowCol( i, j, &srcRow, &srcCol, inverseCt );
if ( !inside ) continue; // we have everything set to no data
qgssize srcIndex = static_cast< qgssize >( srcRow ) * mSrcCols + srcCol;
QgsDebugMsgLevel( QString( "row = %1 col = %2 srcRow = %3 srcCol = %4" ).arg( i ).arg( j ).arg( srcRow ).arg( srcCol ), 5 );
// isNoData() may be slow so we check doNoData first
if ( doNoData && inputBlock->isNoData( srcRow, srcCol ) )
{
outputBlock->setIsNoData( i, j );
continue;
}
qgssize destIndex = static_cast< qgssize >( i ) * width + j;
char *srcBits = inputBlock->bits( srcIndex );
char *destBits = outputBlock->bits( destIndex );
if ( !srcBits )
{
QgsDebugMsg( QString( "Cannot get input block data: row = %1 col = %2" ).arg( i ).arg( j ) );
continue;
}
if ( !destBits )
{
QgsDebugMsg( QString( "Cannot set output block data: srcRow = %1 srcCol = %2" ).arg( srcRow ).arg( srcCol ) );
continue;
}
memcpy( destBits, srcBits, pixelSize );
outputBlock->setIsData( i, j );
}
}
delete inputBlock;
return outputBlock;
}
bool QgsRasterProjector::destExtentSize( const QgsRectangle& theSrcExtent, int theSrcXSize, int theSrcYSize,
QgsRectangle& theDestExtent, int& theDestXSize, int& theDestYSize )