/usr/include/ossim/base/ossimActiveEdgeTable.h is in libossim-dev 1.7.21-3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// License: See top level LICENSE.txt file.
//
// AUTHOR: Garrett Potts
//
//*****************************************************************************
// $Id: ossimActiveEdgeTable.h 14799 2009-06-30 08:54:44Z dburken $
#include <iostream>
#include <vector>
#include <list>
#include <ossim/base/ossimIrect.h>
class ossimPolygon;
class OSSIMDLLEXPORT ossimActiveEdgeTableNode
{
public:
friend std::ostream& operator <<(std::ostream& out,
const ossimActiveEdgeTableNode& rhs)
{
return out <<"| maxy="<<rhs.theMaxY<<" |dx="
<<rhs.theSlope<<" |"<<"x="
<<rhs.theCurrentX << "|"<< std::endl;
// return out <<"|dy="<<rhs.theDeltaY<<" |dx="
// <<rhs.theSlope<<" |"<<"x="
// <<rhs.theCurrentX << "|"<<endl;
}
ossimActiveEdgeTableNode(ossim_int32 maxY = 0,
double slope = 0.0,
double currentX = 0.0)
// :theDeltaY(deltaY),
:theMaxY(maxY),
theSlope(slope),
theCurrentX(currentX)
{
}
bool operator()(const ossimActiveEdgeTableNode& left,
const ossimActiveEdgeTableNode& right)const
{
return (left.theCurrentX < right.theCurrentX);
}
bool operator<(const ossimActiveEdgeTableNode& right)const
{
return (theCurrentX < right.theCurrentX);
}
bool operator>(const ossimActiveEdgeTableNode& right)const
{
return (theCurrentX > right.theCurrentX);
}
ossim_int32 theMaxY;
// ossim_int32 theDeltaY;
double theSlope;
double theCurrentX;
};
class ossimActiveEdgeTableHelper;
/*!
* This class is used in fast efficient scanliine rasterization. It will take a polygon and insert
* it into the table sorted by y's
*/
class ossimActiveEdgeTable
{
public:
friend class ossimActiveEdgeTableHelper;
ossimActiveEdgeTable();
/*!
* Currently will only work on a single polygon. If you call this
* twice it currently will use the last called polygon and
* will wipe out the previous one.
*
* Note: this is used for scanline rasterization and will round
* to integer values all vertices as they are initially added
* to the Active Edge Table.
*/
void addPolygon(const ossimPolygon& polygon);
const std::list<ossimActiveEdgeTableNode>& getActiveList()const;
// bool getNextScanline(list<ossimActiveEdgeTable>::const_iterator& iterator)const;
ossim_int32 getCurrentScanLine()const
{
return theCurrentScanLine;
}
ossim_int32 getYShift()const
{
return theRectOrigin.y;
}
void initializeActiveList();
void updateActiveEdges();
void mergeCurrentScanLine();
void printActiveEdgeList()const;
protected:
std::vector< std::list<ossimActiveEdgeTableNode> > theTable;
std::list<ossimActiveEdgeTableNode> theActiveList;
void createTable(const ossimPolygon& polygon);
void addEdgeToTable(const ossimActiveEdgeTableNode& edge,
ossim_int32 scanLine);
/*!
* Used in computing the number of scanlines of the passed in polygon and
* is also used to shift the y's relative to 0,0
*/
ossimIrect theBoundingRect;
ossimIpt theRectOrigin;
ossim_int32 theLastScanLine;
ossim_int32 theCurrentScanLine;
};
class ossimActiveEdgeTableHelper
{
public:
ossimActiveEdgeTableHelper(ossimActiveEdgeTable* edgeTable);
bool advanceScanLine();
bool getNextLineSegment(ossimIpt& start,
ossimIpt& end);
ossim_int32 getCurrentScanLine()const
{
if(theEdgeTable)
{
return theEdgeTable->getCurrentScanLine();
}
return 0;
}
ossim_int32 getYShift()const
{
if(theEdgeTable)
{
return theEdgeTable->getYShift();
}
return 0;
}
protected:
ossimActiveEdgeTable* theEdgeTable;
bool theTableInitializedFlag;
std::list<ossimActiveEdgeTableNode>::const_iterator theIterator;
};
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