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//========================================================================
//
// SplashXPathScanner.h
//
// Copyright 2003-2013 Glyph & Cog, LLC
//
//========================================================================
#ifndef SPLASHXPATHSCANNER_H
#define SPLASHXPATHSCANNER_H
#include <aconf.h>
#ifdef USE_GCC_PRAGMAS
#pragma interface
#endif
#include "SplashTypes.h"
class GList;
class SplashXPath;
//------------------------------------------------------------------------
// SplashXPathScanner
//------------------------------------------------------------------------
class SplashXPathScanner {
public:
// Create a new SplashXPathScanner object. <xPathA> must be sorted.
SplashXPathScanner(SplashXPath *xPathA, GBool eoA,
int yMinA, int yMaxA);
~SplashXPathScanner();
// Compute shape values for a scan line. Fills in line[] with shape
// values for one scan line: ([x0, x1], y). The values are in [0,
// 255].
void getSpan(Guchar *line, int y, int x0, int x1);
// Like getSpan(), but uses the values 0 and 255 only. Writes 255
// for all pixels which include non-zero area inside the path.
void getSpanBinary(Guchar *line, int y, int x0, int x1);
private:
inline void addArea(Guchar *line, int x, SplashCoord a);
void drawTrapezoid(Guchar *line, int xMin, int xMax,
SplashCoord y0, SplashCoord y1,
SplashCoord xa0, SplashCoord xa1, SplashCoord dydxa,
SplashCoord xb0, SplashCoord xb1, SplashCoord dydxb);
SplashCoord areaLeft(int xp,
SplashCoord x0, SplashCoord y0,
SplashCoord x1, SplashCoord y1,
SplashCoord dydx);
SplashCoord areaRight(int xp,
SplashCoord x0, SplashCoord y0,
SplashCoord x1, SplashCoord y1,
SplashCoord dydx);
void drawRectangle(Guchar *line, int xMin, int xMax,
SplashCoord y0, SplashCoord y1,
SplashCoord x0, SplashCoord x1);
void sortActiveSegs();
void insertActiveSeg(SplashXPathSeg *seg);
SplashXPath *xPath;
GBool eo;
int yMin, yMax;
GList *activeSegs; // [SplashXPathSeg]
int nextSeg;
int yNext;
};
#endif
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