Permalink
Show file tree
Hide file tree
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Browse files
#8725-R: OgrProvider simplifies on provider side
OgrFeatureIterator implements simplification on provider side
- Loading branch information
Showing
6 changed files
with
382 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,241 @@ | ||
| /*************************************************************************** | ||
| 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. * | ||
| * * | ||
| ***************************************************************************/ | ||
|
|
||
| #include "qgsogrgeometrysimplifier.h" | ||
| #include "qgsogrprovider.h" | ||
| #include "qgsapplication.h" | ||
|
|
||
| QgsOgrAbstractGeometrySimplifier::~QgsOgrAbstractGeometrySimplifier() | ||
| { | ||
| } | ||
|
|
||
| /***************************************************************************/ | ||
|
|
||
| QgsOgrTopologyPreservingSimplifier::QgsOgrTopologyPreservingSimplifier( double tolerance ) : QgsTopologyPreservingSimplifier( tolerance ) | ||
| { | ||
| } | ||
|
|
||
| QgsOgrTopologyPreservingSimplifier::~QgsOgrTopologyPreservingSimplifier() | ||
| { | ||
| } | ||
|
|
||
| //! Simplifies the specified geometry | ||
| bool QgsOgrTopologyPreservingSimplifier::simplifyGeometry( OGRGeometry* geometry ) | ||
| { | ||
| OGRwkbGeometryType wkbGeometryType = QgsOgrProvider::ogrWkbSingleFlatten( geometry->getGeometryType() ); | ||
|
|
||
| if ( wkbGeometryType == wkbLineString || wkbGeometryType == wkbPolygon ) | ||
| { | ||
| OGRGeometry* g = geometry->SimplifyPreserveTopology( mTolerance ); | ||
|
|
||
| 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; | ||
|
|
||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| /***************************************************************************/ | ||
|
|
||
| QgsOgrMapToPixelSimplifier::QgsOgrMapToPixelSimplifier( int simplifyFlags, double map2pixelTol ) : QgsMapToPixelSimplifier( simplifyFlags, map2pixelTol ) | ||
| { | ||
| mPointBufferCount = 64; | ||
| mPointBufferPtr = ( OGRRawPoint* )OGRMalloc( mPointBufferCount * sizeof( OGRRawPoint ) ); | ||
| } | ||
|
|
||
| QgsOgrMapToPixelSimplifier::~QgsOgrMapToPixelSimplifier() | ||
| { | ||
| if ( mPointBufferPtr ) | ||
| { | ||
| OGRFree( mPointBufferPtr ); | ||
| mPointBufferPtr = NULL; | ||
| } | ||
| } | ||
|
|
||
| //! 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; | ||
| } | ||
|
|
||
| ////////////////////////////////////////////////////////////////////////////////////////////// | ||
| // Helper simplification methods | ||
|
|
||
| //! 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 ); | ||
|
|
||
| pointSimplifiedCount = pointCount; | ||
| if ( geometryType == QGis::Point || geometryType == QGis::UnknownGeometry ) return false; | ||
| pointSimplifiedCount = 0; | ||
|
|
||
| double map2pixelTol = mMapToPixelTol * mMapToPixelTol; //-> Use mappixelTol for 'LengthSquare' calculations. | ||
| double x, y, lastX = 0, lastY = 0; | ||
|
|
||
| char* xsourcePtr = ( char* )xptr; | ||
| char* ysourcePtr = ( char* )yptr; | ||
| char* xtargetPtr = ( char* )xptr; | ||
| char* ytargetPtr = ( char* )yptr; | ||
|
|
||
| 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; | ||
|
|
||
| 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; | ||
| } | ||
|
|
||
| //! 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() ); | ||
|
|
||
| // Simplify the geometry rewriting temporally its WKB-stream for saving calloc's. | ||
| if ( wkbGeometryType == wkbLineString ) | ||
| { | ||
| OGRLineString* lineString = ( OGRLineString* )geometry; | ||
|
|
||
| int numPoints = lineString->getNumPoints(); | ||
| if (( isaLinearRing && numPoints <= 5 ) || ( !isaLinearRing && numPoints <= 2 ) ) return false; | ||
|
|
||
| OGREnvelope env; | ||
| geometry->getEnvelope( &env ); | ||
| QgsRectangle envelope( env.MinX, env.MinY, env.MaxX, env.MaxY ); | ||
|
|
||
| // Can replace the geometry by its BBOX ? | ||
| if (( mSimplifyFlags & QgsMapToPixelSimplifier::SimplifyEnvelope ) && canbeGeneralizedByMapBoundingBox( envelope ) ) | ||
| { | ||
| OGRRawPoint* points = NULL; | ||
| int numPoints = 0; | ||
|
|
||
| double x1 = envelope.xMinimum(); | ||
| double y1 = envelope.yMinimum(); | ||
| double x2 = envelope.xMaximum(); | ||
| double y2 = envelope.yMaximum(); | ||
|
|
||
| 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; | ||
|
|
||
| OGRRawPoint* points = mallocPoints( numPoints ); | ||
| double* xptr = ( double* )points; | ||
| double* yptr = xptr + 1; | ||
| lineString->getPoints( points ); | ||
|
|
||
| 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 ); | ||
|
|
||
| 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; | ||
|
|
||
| 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; | ||
| } | ||
|
|
||
| ////////////////////////////////////////////////////////////////////////////////////////////// | ||
|
|
||
| //! Simplifies the specified geometry | ||
| bool QgsOgrMapToPixelSimplifier::simplifyGeometry( OGRGeometry* geometry ) | ||
| { | ||
| OGRwkbGeometryType wkbGeometryType = QgsOgrProvider::ogrWkbSingleFlatten( geometry->getGeometryType() ); | ||
|
|
||
| if ( wkbGeometryType == wkbLineString || wkbGeometryType == wkbPolygon ) | ||
| { | ||
| return simplifyOgrGeometry( geometry, wkbGeometryType == wkbPolygon ); | ||
| } | ||
| return false; | ||
| } |
Oops, something went wrong.