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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"
#include "SplashXPath.h"
class GList;
//------------------------------------------------------------------------
// Set this to 0 for antialiasing with 16 levels of gray.
// Set it to 1 for (much slower) antialiasing with 256 levels of gray.
#define ANTIALIAS_256 0
//------------------------------------------------------------------------
// SplashXPathScanner
//------------------------------------------------------------------------
class SplashXPathScanner {
public:
// Create a new SplashXPathScanner object. <xPathA> must be sorted.
SplashXPathScanner(SplashXPath *xPathA, GBool eo,
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]. Also returns the min/max x positions with non-zero shape
// values.
void getSpan(Guchar *line, int y, int x0, int x1, int *xMin, int *xMax);
// 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,
int *xMin, int *xMax);
private:
void insertSegmentBefore(SplashXPathSeg *s, SplashXPathSeg *sNext);
void removeSegment(SplashXPathSeg *s);
void moveSegmentAfter(SplashXPathSeg *s, SplashXPathSeg *sPrev);
void reset(GBool aa, GBool aaChanged);
void skip(int newYBottomI, GBool aa);
void advance(GBool aa);
void generatePixels(int x0, int x1, Guchar *line, int *xMin, int *xMax);
void generatePixelsBinary(int x0, int x1, Guchar *line,
int *xMin, int *xMax);
void drawRectangleSpan(Guchar *line, int y, int x0, int x1,
int *xMin, int *xMax);
void drawRectangleSpanBinary(Guchar *line, int y, int x0, int x1,
int *xMin, int *xMax);
SplashXPath *xPath;
int eoMask;
int yMin, yMax;
int rectX0I, rectY0I, rectX1I, rectY1I;
SplashXPathSeg preSeg, postSeg;
SplashXPathSeg *pre, *post;
GBool resetDone;
GBool resetAA;
int nextSeg;
int yTopI, yBottomI;
SplashCoord yTop, yBottom;
};
#endif
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