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#8725-R: OgrProvider simplifies on provider side
OgrFeatureIterator implements simplification on provider side
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| Original file line number | Diff line number | Diff line change |
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| /*************************************************************************** | ||
| qgsogrgeometrysimplifier.cpp | ||
| --------------------- | ||
| begin : December 2013 | ||
| copyright : (C) 2013 by Alvaro Huarte | ||
| email : http://wiki.osgeo.org/wiki/Alvaro_Huarte | ||
| *************************************************************************** | ||
| * * | ||
| * 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. * | ||
| * * | ||
| ***************************************************************************/ | ||
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| #include "qgsogrgeometrysimplifier.h" | ||
| #include "qgsogrprovider.h" | ||
| #include "qgsapplication.h" | ||
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| QgsOgrAbstractGeometrySimplifier::~QgsOgrAbstractGeometrySimplifier() | ||
| { | ||
| } | ||
|
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| /***************************************************************************/ | ||
|
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| QgsOgrTopologyPreservingSimplifier::QgsOgrTopologyPreservingSimplifier( double tolerance ) : QgsTopologyPreservingSimplifier( tolerance ) | ||
| { | ||
| } | ||
|
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| QgsOgrTopologyPreservingSimplifier::~QgsOgrTopologyPreservingSimplifier() | ||
| { | ||
| } | ||
|
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| //! Simplifies the specified geometry | ||
| bool QgsOgrTopologyPreservingSimplifier::simplifyGeometry( OGRGeometry* geometry ) | ||
| { | ||
| OGRwkbGeometryType wkbGeometryType = QgsOgrProvider::ogrWkbSingleFlatten( geometry->getGeometryType() ); | ||
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| if ( wkbGeometryType == wkbLineString || wkbGeometryType == wkbPolygon ) | ||
| { | ||
| OGRGeometry* g = geometry->SimplifyPreserveTopology( mTolerance ); | ||
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| if ( g ) | ||
| { | ||
| size_t wkbSize = g->WkbSize(); | ||
| unsigned char * wkb = (unsigned char *)OGRMalloc( wkbSize ); | ||
| g->exportToWkb( ( OGRwkbByteOrder ) QgsApplication::endian(), wkb ); | ||
| geometry->importFromWkb( wkb, wkbSize ); | ||
| delete g; | ||
|
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| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
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| /***************************************************************************/ | ||
|
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| QgsOgrMapToPixelSimplifier::QgsOgrMapToPixelSimplifier( int simplifyFlags, double map2pixelTol ) : QgsMapToPixelSimplifier( simplifyFlags, map2pixelTol ) | ||
| { | ||
| mPointBufferCount = 64; | ||
| mPointBufferPtr = ( OGRRawPoint* )OGRMalloc( mPointBufferCount * sizeof( OGRRawPoint ) ); | ||
| } | ||
|
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| QgsOgrMapToPixelSimplifier::~QgsOgrMapToPixelSimplifier() | ||
| { | ||
| if ( mPointBufferPtr ) | ||
| { | ||
| OGRFree( mPointBufferPtr ); | ||
| mPointBufferPtr = NULL; | ||
| } | ||
| } | ||
|
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| //! Returns a point buffer of the specified size | ||
| OGRRawPoint* QgsOgrMapToPixelSimplifier::mallocPoints( int numPoints ) | ||
| { | ||
| if ( mPointBufferPtr && mPointBufferCount < numPoints ) | ||
| { | ||
| OGRFree( mPointBufferPtr ); | ||
| mPointBufferPtr = NULL; | ||
| } | ||
| if ( mPointBufferPtr == NULL ) | ||
| { | ||
| mPointBufferCount = numPoints; | ||
| mPointBufferPtr = ( OGRRawPoint* )OGRMalloc( mPointBufferCount * sizeof( OGRRawPoint ) ); | ||
| } | ||
| return mPointBufferPtr; | ||
| } | ||
|
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| ////////////////////////////////////////////////////////////////////////////////////////////// | ||
| // Helper simplification methods | ||
|
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| //! Simplifies the OGR-geometry (Removing duplicated points) when is applied the specified map2pixel context | ||
| bool QgsOgrMapToPixelSimplifier::simplifyOgrGeometry( QGis::GeometryType geometryType, const QgsRectangle& envelope, double* xptr, int xStride, double* yptr, int yStride, int pointCount, int& pointSimplifiedCount ) | ||
| { | ||
| bool canbeGeneralizable = ( mSimplifyFlags & QgsMapToPixelSimplifier::SimplifyGeometry ); | ||
|
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| pointSimplifiedCount = pointCount; | ||
| if ( geometryType == QGis::Point || geometryType == QGis::UnknownGeometry ) return false; | ||
| pointSimplifiedCount = 0; | ||
|
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| double map2pixelTol = mMapToPixelTol * mMapToPixelTol; //-> Use mappixelTol for 'LengthSquare' calculations. | ||
| double x, y, lastX = 0, lastY = 0; | ||
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| char* xsourcePtr = ( char* )xptr; | ||
| char* ysourcePtr = ( char* )yptr; | ||
| char* xtargetPtr = ( char* )xptr; | ||
| char* ytargetPtr = ( char* )yptr; | ||
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| for ( int i = 0, numPoints = geometryType == QGis::Polygon ? pointCount - 1 : pointCount; i < numPoints; ++i ) | ||
| { | ||
| memcpy( &x, xsourcePtr, sizeof( double ) ); xsourcePtr += xStride; | ||
| memcpy( &y, ysourcePtr, sizeof( double ) ); ysourcePtr += yStride; | ||
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| if ( i == 0 || !canbeGeneralizable || QgsMapToPixelSimplifier::calculateLengthSquared2D( x, y, lastX, lastY ) > map2pixelTol ) | ||
| { | ||
| memcpy( xtargetPtr, &x, sizeof( double ) ); lastX = x; xtargetPtr += xStride; | ||
| memcpy( ytargetPtr, &y, sizeof( double ) ); lastY = y; ytargetPtr += yStride; | ||
| pointSimplifiedCount++; | ||
| } | ||
| } | ||
| if ( geometryType == QGis::Polygon ) | ||
| { | ||
| memcpy( xtargetPtr, xptr, sizeof( double ) ); | ||
| memcpy( ytargetPtr, yptr, sizeof( double ) ); | ||
| pointSimplifiedCount++; | ||
| } | ||
| return pointSimplifiedCount != pointCount; | ||
| } | ||
|
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| //! Simplifies the OGR-geometry (Removing duplicated points) when is applied the specified map2pixel context | ||
| bool QgsOgrMapToPixelSimplifier::simplifyOgrGeometry( OGRGeometry* geometry, bool isaLinearRing ) | ||
| { | ||
| OGRwkbGeometryType wkbGeometryType = wkbFlatten( geometry->getGeometryType() ); | ||
|
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| // Simplify the geometry rewriting temporally its WKB-stream for saving calloc's. | ||
| if ( wkbGeometryType == wkbLineString ) | ||
| { | ||
| OGRLineString* lineString = ( OGRLineString* )geometry; | ||
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| int numPoints = lineString->getNumPoints(); | ||
| if (( isaLinearRing && numPoints <= 5 ) || ( !isaLinearRing && numPoints <= 2 ) ) return false; | ||
|
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| OGREnvelope env; | ||
| geometry->getEnvelope( &env ); | ||
| QgsRectangle envelope( env.MinX, env.MinY, env.MaxX, env.MaxY ); | ||
|
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| // Can replace the geometry by its BBOX ? | ||
| if (( mSimplifyFlags & QgsMapToPixelSimplifier::SimplifyEnvelope ) && canbeGeneralizedByMapBoundingBox( envelope ) ) | ||
| { | ||
| OGRRawPoint* points = NULL; | ||
| int numPoints = 0; | ||
|
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| double x1 = envelope.xMinimum(); | ||
| double y1 = envelope.yMinimum(); | ||
| double x2 = envelope.xMaximum(); | ||
| double y2 = envelope.yMaximum(); | ||
|
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| if ( isaLinearRing ) | ||
| { | ||
| numPoints = 5; | ||
| points = mallocPoints( numPoints ); | ||
| points[0].x = x1; points[0].y = y1; | ||
| points[1].x = x2; points[1].y = y1; | ||
| points[2].x = x2; points[2].y = y2; | ||
| points[3].x = x1; points[3].y = y2; | ||
| points[4].x = x1; points[4].y = y1; | ||
| } | ||
| else | ||
| { | ||
| numPoints = 2; | ||
| points = mallocPoints( numPoints ); | ||
| points[0].x = x1; points[0].y = y1; | ||
| points[1].x = x2; points[1].y = y2; | ||
| } | ||
| lineString->setPoints( numPoints, points ); | ||
| lineString->flattenTo2D(); | ||
| return true; | ||
| } | ||
| else | ||
| if ( mSimplifyFlags & QgsMapToPixelSimplifier::SimplifyGeometry ) | ||
| { | ||
| QGis::GeometryType geometryType = isaLinearRing ? QGis::Polygon : QGis::Line; | ||
| int numSimplifiedPoints = 0; | ||
|
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| OGRRawPoint* points = mallocPoints( numPoints ); | ||
| double* xptr = ( double* )points; | ||
| double* yptr = xptr + 1; | ||
| lineString->getPoints( points ); | ||
|
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| if ( simplifyOgrGeometry( geometryType, envelope, xptr, 16, yptr, 16, numPoints, numSimplifiedPoints ) ) | ||
| { | ||
| lineString->setPoints( numSimplifiedPoints, points ); | ||
| lineString->flattenTo2D(); | ||
| } | ||
| return numSimplifiedPoints != numPoints; | ||
| } | ||
| } | ||
| else | ||
| if ( wkbGeometryType == wkbPolygon ) | ||
| { | ||
| OGRPolygon* polygon = ( OGRPolygon* )geometry; | ||
| bool result = simplifyOgrGeometry( polygon->getExteriorRing(), true ); | ||
|
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| for ( int i = 0, numInteriorRings = polygon->getNumInteriorRings(); i < numInteriorRings; ++i ) | ||
| { | ||
| result |= simplifyOgrGeometry( polygon->getInteriorRing( i ), true ); | ||
| } | ||
| if ( result ) polygon->flattenTo2D(); | ||
| return result; | ||
| } | ||
| else | ||
| if ( wkbGeometryType == wkbMultiLineString || wkbGeometryType == wkbMultiPolygon ) | ||
| { | ||
| OGRGeometryCollection* collection = ( OGRGeometryCollection* )geometry; | ||
| bool result = false; | ||
|
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| for ( int i = 0, numGeometries = collection->getNumGeometries(); i < numGeometries; ++i ) | ||
| { | ||
| result |= simplifyOgrGeometry( collection->getGeometryRef( i ), wkbGeometryType == wkbMultiPolygon ); | ||
| } | ||
| if ( result ) collection->flattenTo2D(); | ||
| return result; | ||
| } | ||
| return false; | ||
| } | ||
|
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| ////////////////////////////////////////////////////////////////////////////////////////////// | ||
|
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| //! Simplifies the specified geometry | ||
| bool QgsOgrMapToPixelSimplifier::simplifyGeometry( OGRGeometry* geometry ) | ||
| { | ||
| OGRwkbGeometryType wkbGeometryType = QgsOgrProvider::ogrWkbSingleFlatten( geometry->getGeometryType() ); | ||
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| if ( wkbGeometryType == wkbLineString || wkbGeometryType == wkbPolygon ) | ||
| { | ||
| return simplifyOgrGeometry( geometry, wkbGeometryType == wkbPolygon ); | ||
| } | ||
| return false; | ||
| } |
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