//! 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;
}
OGRErr OGRGeometryCollection::importFromWkb( unsigned char * pabyData,
int nSize )
{
OGRwkbByteOrder eByteOrder;
int nDataOffset;
if( nSize < 9 && nSize != -1 )
return OGRERR_NOT_ENOUGH_DATA;
/* -------------------------------------------------------------------- */
/* Get the byte order byte. */
/* -------------------------------------------------------------------- */
eByteOrder = DB2_V72_FIX_BYTE_ORDER((OGRwkbByteOrder) *pabyData);
CPLAssert( eByteOrder == wkbXDR || eByteOrder == wkbNDR );
/* -------------------------------------------------------------------- */
/* Get the geometry feature type. For now we assume that */
/* geometry type is between 0 and 255 so we only have to fetch */
/* one byte. */
/* -------------------------------------------------------------------- */
#ifdef DEBUG
OGRwkbGeometryType eGeometryType;
if( eByteOrder == wkbNDR )
{
eGeometryType = (OGRwkbGeometryType) pabyData[1];
}
else
{
eGeometryType = (OGRwkbGeometryType) pabyData[4];
}
CPLAssert( eGeometryType == wkbGeometryCollection
|| eGeometryType == wkbMultiPolygon
|| eGeometryType == wkbMultiLineString
|| eGeometryType == wkbMultiPoint );
#endif
/* -------------------------------------------------------------------- */
/* Do we already have some existing geometry objects? */
/* -------------------------------------------------------------------- */
if( nGeomCount != 0 )
{
for( int iGeom = 0; iGeom < nGeomCount; iGeom++ )
delete papoGeoms[iGeom];
OGRFree( papoGeoms );
papoGeoms = NULL;
}
/* -------------------------------------------------------------------- */
/* Get the geometry count. */
/* -------------------------------------------------------------------- */
memcpy( &nGeomCount, pabyData + 5, 4 );
if( OGR_SWAP( eByteOrder ) )
nGeomCount = CPL_SWAP32(nGeomCount);
papoGeoms = (OGRGeometry **) OGRMalloc(sizeof(void*) * nGeomCount);
nDataOffset = 9;
if( nSize != -1 )
nSize -= nDataOffset;
nCoordinateDimension = 0; // unknown
/* -------------------------------------------------------------------- */
/* Get the Geoms. */
/* -------------------------------------------------------------------- */
for( int iGeom = 0; iGeom < nGeomCount; iGeom++ )
{
OGRErr eErr;
eErr = OGRGeometryFactory::
createFromWkb( pabyData + nDataOffset, NULL,
papoGeoms + iGeom, nSize );
if( eErr != OGRERR_NONE )
{
nGeomCount = iGeom;
return eErr;
}
if( nSize != -1 )
nSize -= papoGeoms[iGeom]->WkbSize();
nDataOffset += papoGeoms[iGeom]->WkbSize();
}
return OGRERR_NONE;
}
QgsOgrMapToPixelSimplifier::QgsOgrMapToPixelSimplifier( int simplifyFlags, const QgsCoordinateTransform* coordinateTransform, const QgsMapToPixel* mapTolPixel, float mapToPixelTol ) : QgsMapToPixelSimplifier( simplifyFlags, coordinateTransform, mapTolPixel, mapToPixelTol )
{
mPointBufferCount = 512;
mPointBufferPtr = ( OGRRawPoint* )OGRMalloc( mPointBufferCount * sizeof( OGRRawPoint ) );
}
OGRErr OGRPolygon::importFromWkb( unsigned char * pabyData,
int nBytesAvailable )
{
OGRwkbByteOrder eByteOrder;
int nDataOffset;
if( nBytesAvailable < 21 && nBytesAvailable != -1 )
return OGRERR_NOT_ENOUGH_DATA;
/* -------------------------------------------------------------------- */
/* Get the byte order byte. */
/* -------------------------------------------------------------------- */
eByteOrder = (OGRwkbByteOrder) *pabyData;
CPLAssert( eByteOrder == wkbXDR || eByteOrder == wkbNDR );
/* -------------------------------------------------------------------- */
/* Get the geometry feature type. For now we assume that */
/* geometry type is between 0 and 255 so we only have to fetch */
/* one byte. */
/* -------------------------------------------------------------------- */
#ifdef DEBUG
OGRwkbGeometryType eGeometryType;
if( eByteOrder == wkbNDR )
eGeometryType = (OGRwkbGeometryType) pabyData[1];
else
eGeometryType = (OGRwkbGeometryType) pabyData[4];
CPLAssert( eGeometryType == wkbPolygon );
#endif
/* -------------------------------------------------------------------- */
/* Do we already have some rings? */
/* -------------------------------------------------------------------- */
if( nRingCount != 0 )
{
for( int iRing = 0; iRing < nRingCount; iRing++ )
delete papoRings[iRing];
OGRFree( papoRings );
papoRings = NULL;
}
/* -------------------------------------------------------------------- */
/* Get the ring count. */
/* -------------------------------------------------------------------- */
memcpy( &nRingCount, pabyData + 5, 4 );
if( OGR_SWAP( eByteOrder ) )
nRingCount = CPL_SWAP32(nRingCount);
papoRings = (OGRLinearRing **) OGRMalloc(sizeof(void*) * nRingCount);
nDataOffset = 9;
if( nBytesAvailable != -1 )
nBytesAvailable -= nDataOffset;
/* -------------------------------------------------------------------- */
/* Get the rings. */
/* -------------------------------------------------------------------- */
for( int iRing = 0; iRing < nRingCount; iRing++ )
{
OGRErr eErr;
papoRings[iRing] = new OGRLinearRing();
eErr = papoRings[iRing]->_importFromWkb( eByteOrder,
pabyData + nDataOffset,
nBytesAvailable );
if( eErr != OGRERR_NONE )
{
nRingCount = iRing;
return eErr;
}
if( nBytesAvailable != -1 )
nBytesAvailable -= papoRings[iRing]->_WkbSize();
nDataOffset += papoRings[iRing]->_WkbSize();
}
return OGRERR_NONE;
}