/src/xpdf-4.06/splash/SplashXPathScanner.cc

Source
//========================================================================
//
// SplashXPathScanner.cc
//
// Copyright 2003-2013 Glyph & Cog, LLC
//
//========================================================================

#include <aconf.h>

#include <stdlib.h>
#include <string.h>
#if HAVE_STD_SORT
#include <algorithm>
#endif
#include "gmem.h"
#include "gmempp.h"
#include "GList.h"
#include "SplashMath.h"
#include "SplashXPath.h"
#include "SplashXPathScanner.h"

//------------------------------------------------------------------------

#if ANTIALIAS_256

#define aaVert  15
#define aaHoriz 17

#else

#define aaVert  4
#define aaHoriz 4

// 4x4 oversampling tends to generate alpha (coverage) values that are
// too high, so we reduce them here. (Yes, this is a kludge.)
static Guchar map16to255[17] = {
  0,
  16 / 2,
  32 / 2,
  48 / 2,
  64 - 32,
  80 - 32,
  96 - 32,
  112 - 32,
  128 - 32,
  143 - 32,
  159 - 32,
  175 - 32,
  191 - 32,
  207 - 32,
  223 - 32,
  239 - 32,
  255
};

#endif

//------------------------------------------------------------------------

SplashXPathScanner::SplashXPathScanner(SplashXPath *xPathA, GBool eo,
               int yMinA, int yMaxA) {
  xPath = xPathA;
  eoMask = eo ? 1 : 0xffffffff;
  yMin = yMinA;
  yMax = yMaxA;
  if (xPath->isRect) {
    rectX0I = splashFloor(xPath->rectX0);
    rectY0I = splashFloor(xPath->rectY0);
    rectX1I = splashFloor(xPath->rectX1);
    rectY1I = splashFloor(xPath->rectY1);
  }

  pre = &preSeg;
  post = &postSeg;
  pre->mx = xPath->xMin - 1;
  post->mx = xPath->xMax + 1;

  resetDone = gFalse;
  resetAA = gFalse;
}

SplashXPathScanner::~SplashXPathScanner() {
}

void SplashXPathScanner::insertSegmentBefore(SplashXPathSeg *s,
               SplashXPathSeg *sNext) {
  SplashXPathSeg *sPrev;

  sPrev = sNext->prev;
  sPrev->next = s;
  s->prev = sPrev;
  s->next = sNext;
  sNext->prev = s;
}

void SplashXPathScanner::removeSegment(SplashXPathSeg *s) {
  SplashXPathSeg *sPrev, *sNext;

  sPrev = s->prev;
  sNext = s->next;
  sPrev->next = sNext;
  sNext->prev = sPrev;
  s->prev = s->next = NULL;
}

void SplashXPathScanner::moveSegmentAfter(SplashXPathSeg *s,
            SplashXPathSeg *sPrev) {
  SplashXPathSeg *sNext;

  s->prev->next = s->next;
  s->next->prev = s->prev;

  sNext = sPrev->next;
  sPrev->next = s;
  s->prev = sPrev;
  s->next = sNext;
  sNext->prev = s;
}

void SplashXPathScanner::reset(GBool aa, GBool aaChanged) {
  SplashXPathSeg *seg;
  SplashCoord y;
  int i;

  //--- initialize segment parameters
  for (i = 0; i < xPath->length; ++i) {
    seg = &xPath->segs[i];
    if (aa) {
      if (aaChanged) {
  seg->iy = splashFloor(seg->y0 * aaVert);
      }
      y = (SplashCoord)(seg->iy + 1) / (SplashCoord)aaVert;
    } else {
      if (aaChanged) {
  seg->iy = splashFloor(seg->y0);
      }
      y = (SplashCoord)(seg->iy + 1);
    }
    seg->sx0 = seg->x0;
    if (seg->y1 <= y) {
      seg->sx1 = seg->x1;
    } else {
      seg->sx1 = seg->x0 + (y - seg->y0) * seg->dxdy;
    }
    seg->mx = (seg->sx0 <= seg->sx1) ? seg->sx0 : seg->sx1;
    seg->prev = seg->next = NULL;
  }

  //--- sort the inactive segments by iy, mx
  if (aaChanged) {
#if HAVE_STD_SORT
    std::sort(xPath->segs, xPath->segs + xPath->length, &SplashXPathSeg::cmpMX);
#else
    qsort(xPath->segs, xPath->length, sizeof(SplashXPathSeg),
    &SplashXPathSeg::cmpMX);
#endif
  }

  //--- initialize the active list
  pre->prev = NULL;
  pre->next = post;
  post->prev = pre;
  post->next = NULL;

  //--- initialize the scan state
  nextSeg = 0;
  if (xPath->length) {
    yBottomI = xPath->segs[0].iy;
    if (aa) {
      yBottomI -= yBottomI % aaVert;
    }
  } else {
    yBottomI = 0;
  }
  yTopI = yBottomI - 1;
  if (aa) {
    yTop = (SplashCoord)yTopI / (SplashCoord)aaVert;
    yBottom = (SplashCoord)yBottomI / (SplashCoord)aaVert;
  } else {
    yTop = (SplashCoord)yTopI;
    yBottom = (SplashCoord)yBottomI;
  }

  resetDone = gTrue;
  resetAA = aa;
}

void SplashXPathScanner::skip(int newYBottomI, GBool aa) {
  SplashXPathSeg *s0, *s1,*s2;
  int iy;

  yTopI = newYBottomI - 1;
  yBottomI = newYBottomI;
  if (aa) {
    yTop = (SplashCoord)yTopI / (SplashCoord)aaVert;
    yBottom = (SplashCoord)yBottomI / (SplashCoord)aaVert;
  } else {
    yTop = (SplashCoord)yTopI;
    yBottom = (SplashCoord)yBottomI;
  }

  //--- remove finished segments; update sx0, sx1, mx for active segments
  s0 = pre->next;
  while (s0 != post) {
    s1 = s0->next;

    // check for a finished segment
    if (s0->y1 < yTop) {
      removeSegment(s0);

    // compute sx0, sx1, mx
    } else {
      if (s0->y0 >= yTop) {
  s0->sx0 = s0->x0;
      } else {
  s0->sx0 = s0->x0 + (yTop - s0->y0) * s0->dxdy;
      }
      if (s0->y1 <= yBottom) {
  s0->sx1 = s0->x1;
      } else {
  s0->sx1 = s0->x0 + (yBottom - s0->y0) * s0->dxdy;
      }
      s0->mx = (s0->sx0 <= s0->sx1) ? s0->sx0 : s0->sx1;
    }

    s0 = s1;
  }

  //--- check for intersections
  s0 = pre->next;
  if (s0 != post) {
    s1 = s0->next;
    while (s1 != post) {
      if (s1->mx < s0->mx) {
  for (s2 = s0->prev; s1->mx < s2->mx; s2 = s2->prev) ;
  moveSegmentAfter(s1, s2);
      } else {
  s0 = s1;
      }
      s1 = s0->next;
    }
  }

  //--- insert new segments with a merge sort
  // - this has to be done one (sub)scanline at a time, because the
  //   inactive list is bin-sorted by (sub)scanline
  while (nextSeg < xPath->length && xPath->segs[nextSeg].iy <= yTopI) {
    // the first inactive segment determines the next scanline to process
    iy = xPath->segs[nextSeg].iy;
    s0 = pre->next;
    do {
      s1 = &xPath->segs[nextSeg];
      ++nextSeg;
      if (s1->y1 < yTop) {
  continue;
      }
      if (s1->y0 >= yTop) {
  s1->sx0 = s1->x0;
      } else {
  s1->sx0 = s1->x0 + (yTop - s1->y0) * s1->dxdy;
      }
      if (s1->y1 <= yBottom) {
  s1->sx1 = s1->x1;
      } else {
  s1->sx1 = s1->x0 + (yBottom - s1->y0) * s1->dxdy;
      }
      s1->mx = (s1->sx0 <= s1->sx1) ? s1->sx0 : s1->sx1;
      insertSegmentBefore(s1, s0);
    } while (nextSeg < xPath->length && xPath->segs[nextSeg].iy <= iy);
  }
}

void SplashXPathScanner::advance(GBool aa) {
  SplashXPathSeg *s, *sNext, *s1;

  yTopI = yBottomI;
  yTop = yBottom;
  yBottomI = yTopI + 1;
  if (aa) {
    yBottom = (SplashCoord)yBottomI / (SplashCoord)aaVert;
  } else {
    yBottom = (SplashCoord)yBottomI;
  }

  s = pre->next;
  while (s != post) {
    sNext = s->next;

    // check for a finished segment
    if (s->y1 < yTop) {
      removeSegment(s);

    } else {

      // compute sx0, sx1, mx
      s->sx0 = s->sx1;
      if (s->y1 <= yBottom) {
  s->sx1 = s->x1;
      } else {
  s->sx1 = s->x0 + (yBottom - s->y0) * s->dxdy;
      }
      s->mx = (s->sx0 <= s->sx1) ? s->sx0 : s->sx1;

      // check for intersection
      if (s->mx < s->prev->mx) {
  for (s1 = s->prev->prev; s->mx < s1->mx; s1 = s1->prev) ;
  moveSegmentAfter(s, s1);
      }
    }

    s = sNext;
  }

  // insert new segments
  s = pre->next;
  while (nextSeg < xPath->length && xPath->segs[nextSeg].iy <= yTopI) {
    s1 = &xPath->segs[nextSeg];
    ++nextSeg;
    while (s1->mx > s->mx) {
      s = s->next;
    }
    insertSegmentBefore(s1, s);
  }
}

void SplashXPathScanner::generatePixels(int x0, int x1, Guchar *line,
          int *xMin, int *xMax) {
  SplashXPathSeg *s;
  int fillCount, x, xEnd, ix0, ix1, t;

  fillCount = 0;
  x = x0 * aaHoriz;
  xEnd = (x1 + 1) * aaHoriz;
  for (s = pre->next; s != post && x < xEnd; s = s->next) {
    ix0 = splashFloor(s->sx0 * aaHoriz);
    ix1 = splashFloor(s->sx1 * aaHoriz);
    if (ix0 > ix1) {
      t = ix0;  ix0 = ix1;  ix1 = t;
    }
    if (!(fillCount & eoMask)) {
      if (ix0 > x) {
  x = ix0;
      }
    }
    if (ix1 >= xEnd) {
      ix1 = xEnd - 1;
    }
    if (x / aaHoriz < *xMin) {
      *xMin = x / aaHoriz;
    }
    if (ix1 / aaHoriz > *xMax) {
      *xMax = ix1 / aaHoriz;
    }
    for (; x <= ix1; ++x) {
      ++line[x / aaHoriz];
    }
    if (s->y0 <= yTop && s->y1 > yTop) {
      fillCount += s->count;
    }
  }
}

void SplashXPathScanner::generatePixelsBinary(int x0, int x1, Guchar *line,
                int *xMin, int *xMax) {
  SplashXPathSeg *s;
  int fillCount, x, xEnd, ix0, ix1, t;

  fillCount = 0;
  x = x0;
  xEnd = x1 + 1;
  for (s = pre->next; s != post && x < xEnd; s = s->next) {
    ix0 = splashFloor(s->sx0);
    ix1 = splashFloor(s->sx1);
    if (ix0 > ix1) {
      t = ix0;  ix0 = ix1;  ix1 = t;
    }
    if (!(fillCount & eoMask)) {
      if (ix0 > x) {
  x = ix0;
      }
    }
    if (ix1 >= xEnd) {
      ix1 = xEnd - 1;
    }
    if (x < *xMin) {
      *xMin = x;
    }
    if (ix1 > *xMax) {
      *xMax = ix1;
    }
    for (; x <= ix1; ++x) {
      line[x] = 255;
    }
    if (s->y0 <= yTop && s->y1 > yTop) {
      fillCount += s->count;
    }
  }
}

void SplashXPathScanner::drawRectangleSpan(Guchar *line, int y,
             int x0, int x1,
             int *xMin, int *xMax) {
  SplashCoord edge;
  Guchar pix;
  int xe, x;

  if (rectX0I > x1 || rectX1I < x0) {
    return;
  }

  *xMin = x0 <= rectX0I ? rectX0I : x0;
  *xMax = rectX1I <= x1 ? rectX1I : x1;

  //--- upper edge
  if (y == rectY0I) {

    // handle a rectangle less than one pixel high
    if (rectY0I == rectY1I) {
      edge = xPath->rectY1 - xPath->rectY0;
    } else {
      edge = (SplashCoord)1 - (xPath->rectY0 - rectY0I);
    }

    // upper left corner
    if (x0 <= rectX0I) {
      pix = (Guchar)splashCeil(edge
             * ((SplashCoord)1 - (xPath->rectX0 - rectX0I))
             * 255);
      if (pix < 16) {
  pix = 16;
      }
      line[rectX0I] = pix;
      x = rectX0I + 1;
    } else {
      x = x0;
    }

    // upper right corner
    if (rectX1I <= x1) {
      pix = (Guchar)splashCeil(edge * (xPath->rectX1 - rectX1I) * 255);
      if (pix < 16) {
  pix = 16;
      }
      line[rectX1I] = pix;
      xe = rectX1I - 1;
    } else {
      xe = x1;
    }

    // upper edge
    pix = (Guchar)splashCeil(edge * 255);
    if (pix < 16) {
      pix = 16;
    }
    for (; x <= xe; ++x) {
      line[x] = pix;
    }

  //--- lower edge
  } else if (y == rectY1I) {
    edge = xPath->rectY1 - rectY1I;

    // lower left corner
    if (x0 <= rectX0I) {
      pix = (Guchar)splashCeil(edge
             * ((SplashCoord)1 - (xPath->rectX0 - rectX0I))
             * 255);
      if (pix < 16) {
  pix = 16;
      }
      line[rectX0I] = pix;
      x = rectX0I + 1;
    } else {
      x = x0;
    }

    // lower right corner
    if (rectX1I <= x1) {
      pix = (Guchar)splashCeil(edge * (xPath->rectX1 - rectX1I) * 255);
      if (pix < 16) {
  pix = 16;
      }
      line[rectX1I] = pix;
      xe = rectX1I - 1;
    } else {
      xe = x1;
    }

    // lower edge
    pix = (Guchar)splashCeil(edge * 255);
    if (pix < 16) {
      pix = 16;
    }
    for (; x <= xe; ++x) {
      line[x] = pix;
    }

  //--- between the upper and lower edges
  } else if (y > rectY0I && y < rectY1I) {

    // left edge
    if (x0 <= rectX0I) {
      pix = (Guchar)splashCeil(((SplashCoord)1 - (xPath->rectX0 - rectX0I))
             * 255);
      if (pix < 16) {
  pix = 16;
      }
      line[rectX0I] = pix;
      x = rectX0I + 1;
    } else {
      x = x0;
    }

    // right edge
    if (rectX1I <= x1) {
      pix = (Guchar)splashCeil((xPath->rectX1 - rectX1I) * 255);
      if (pix < 16) {
  pix = 16;
      }
      line[rectX1I] = pix;
      xe = rectX1I - 1;
    } else {
      xe = x1;
    }

    // middle
    for (; x <= xe; ++x) {
      line[x] = 255;
    }
  }
}

void SplashXPathScanner::drawRectangleSpanBinary(Guchar *line, int y,
             int x0, int x1,
             int *xMin, int *xMax) {
  int xe, x;

  if (y >= rectY0I && y <= rectY1I) {
    if (x0 <= rectX0I) {
      x = rectX0I;
    } else {
      x = x0;
    }
    *xMin = x;
    if (rectX1I <= x1) {
      xe = rectX1I;
    } else {
      xe = x1;
    }
    *xMax = xe;
    for (; x <= xe; ++x) {
      line[x] = 255;
    }
  }
}

void SplashXPathScanner::getSpan(Guchar *line, int y, int x0, int x1,
         int *xMin, int *xMax) {
  int iy, x, k;

  iy = y * aaVert;
  if (!resetDone || !resetAA) {
    reset(gTrue, gTrue);
  } else if (yBottomI > iy) {
    reset(gTrue, gFalse);
  }
  memset(line + x0, 0, x1 - x0 + 1);

  *xMin = x1 + 1;
  *xMax = x0 - 1;

  if (xPath->isRect) {
    drawRectangleSpan(line, y, x0, x1, xMin, xMax);
    return;
  }

  if (yBottomI < iy) {
    skip(iy, gTrue);
  }
  for (k = 0; k < aaVert; ++k, ++iy) {
    advance(gTrue);
    generatePixels(x0, x1, line, xMin, xMax);
  }

#if !ANTIALIAS_256
  for (x = *xMin; x <= *xMax; ++x) {
    line[x] = map16to255[line[x]];
  }
#endif
}

void SplashXPathScanner::getSpanBinary(Guchar *line, int y, int x0, int x1,
               int *xMin, int *xMax) {
  int iy;

  iy = y;
  if (!resetDone || resetAA) {
    reset(gFalse, gTrue);
  } else if (yBottomI > iy) {
    reset(gFalse, gFalse);
  }
  memset(line + x0, 0, x1 - x0 + 1);

  *xMin = x1 + 1;
  *xMax = x0 - 1;

  if (xPath->isRect) {
    drawRectangleSpanBinary(line, y, x0, x1, xMin, xMax);
    return;
  }

  if (yBottomI < iy) {
    skip(iy, gFalse);
  }
  advance(gFalse);
  generatePixelsBinary(x0, x1, line, xMin, xMax);
}

Coverage Report

Created: 2026-07-04 07:15

Line	Count	Source
1		//========================================================================
2		//
3		// SplashXPathScanner.cc
4		//
5		// Copyright 2003-2013 Glyph & Cog, LLC
6		//
7		//========================================================================
8
9		#include <aconf.h>
10
11		#include <stdlib.h>
12		#include <string.h>
13		#if HAVE_STD_SORT
14		#include <algorithm>
15		#endif
16		#include "gmem.h"
17		#include "gmempp.h"
18		#include "GList.h"
19		#include "SplashMath.h"
20		#include "SplashXPath.h"
21		#include "SplashXPathScanner.h"
22
23		//------------------------------------------------------------------------
24
25		#if ANTIALIAS_256
26
27		#define aaVert 15
28		#define aaHoriz 17
29
30		#else
31
32	51.8M	#define aaVert 4
33	14.2M	#define aaHoriz 4
34
35		// 4x4 oversampling tends to generate alpha (coverage) values that are
36		// too high, so we reduce them here. (Yes, this is a kludge.)
37		static Guchar map16to255[17] = {
38		0,
39		16 / 2,
40		32 / 2,
41		48 / 2,
42		64 - 32,
43		80 - 32,
44		96 - 32,
45		112 - 32,
46		128 - 32,
47		143 - 32,
48		159 - 32,
49		175 - 32,
50		191 - 32,
51		207 - 32,
52		223 - 32,
53		239 - 32,
54		255
55		};
56
57		#endif
58
59		//------------------------------------------------------------------------
60
61		SplashXPathScanner::SplashXPathScanner(SplashXPath *xPathA, GBool eo,
62	163k	int yMinA, int yMaxA) {
63	163k	xPath = xPathA;
64	163k	eoMask = eo ? 1 : 0xffffffff;
65	163k	yMin = yMinA;
66	163k	yMax = yMaxA;
67	163k	if (xPath->isRect) {
68	20.5k	rectX0I = splashFloor(xPath->rectX0);
69	20.5k	rectY0I = splashFloor(xPath->rectY0);
70	20.5k	rectX1I = splashFloor(xPath->rectX1);
71	20.5k	rectY1I = splashFloor(xPath->rectY1);
72	20.5k	}
73
74	163k	pre = &preSeg;
75	163k	post = &postSeg;
76	163k	pre->mx = xPath->xMin - 1;
77	163k	post->mx = xPath->xMax + 1;
78
79	163k	resetDone = gFalse;
80	163k	resetAA = gFalse;
81	163k	}
82
83	163k	SplashXPathScanner::~SplashXPathScanner() {
84	163k	}
85
86		void SplashXPathScanner::insertSegmentBefore(SplashXPathSeg *s,
87	3.29M	SplashXPathSeg *sNext) {
88	3.29M	SplashXPathSeg *sPrev;
89
90	3.29M	sPrev = sNext->prev;
91	3.29M	sPrev->next = s;
92	3.29M	s->prev = sPrev;
93	3.29M	s->next = sNext;
94	3.29M	sNext->prev = s;
95	3.29M	}
96
97	1.77M	void SplashXPathScanner::removeSegment(SplashXPathSeg *s) {
98	1.77M	SplashXPathSeg sPrev, sNext;
99
100	1.77M	sPrev = s->prev;
101	1.77M	sNext = s->next;
102	1.77M	sPrev->next = sNext;
103	1.77M	sNext->prev = sPrev;
104	1.77M	s->prev = s->next = NULL;
105	1.77M	}
106
107		void SplashXPathScanner::moveSegmentAfter(SplashXPathSeg *s,
108	390k	SplashXPathSeg *sPrev) {
109	390k	SplashXPathSeg *sNext;
110
111	390k	s->prev->next = s->next;
112	390k	s->next->prev = s->prev;
113
114	390k	sNext = sPrev->next;
115	390k	sPrev->next = s;
116	390k	s->prev = sPrev;
117	390k	s->next = sNext;
118	390k	sNext->prev = s;
119	390k	}
120
121	106k	void SplashXPathScanner::reset(GBool aa, GBool aaChanged) {
122	106k	SplashXPathSeg *seg;
123	106k	SplashCoord y;
124	106k	int i;
125
126		//--- initialize segment parameters
127	38.8M	for (i = 0; i < xPath->length; ++i) {
128	38.7M	seg = &xPath->segs[i];
129	38.7M	if (aa) {
130	25.8M	if (aaChanged) {
131	24.7M	seg->iy = splashFloor(seg->y0 * aaVert);
132	24.7M	}
133	25.8M	y = (SplashCoord)(seg->iy + 1) / (SplashCoord)aaVert;
134	25.8M	} else {
135	12.9M	if (aaChanged) {
136	10.5M	seg->iy = splashFloor(seg->y0);
137	10.5M	}
138	12.9M	y = (SplashCoord)(seg->iy + 1);
139	12.9M	}
140	38.7M	seg->sx0 = seg->x0;
141	38.7M	if (seg->y1 <= y) {
142	20.1M	seg->sx1 = seg->x1;
143	20.1M	} else {
144	18.5M	seg->sx1 = seg->x0 + (y - seg->y0) * seg->dxdy;
145	18.5M	}
146	38.7M	seg->mx = (seg->sx0 <= seg->sx1) ? seg->sx0 : seg->sx1;
147	38.7M	seg->prev = seg->next = NULL;
148	38.7M	}
149
150		//--- sort the inactive segments by iy, mx
151	106k	if (aaChanged) {
152	45.2k	#if HAVE_STD_SORT
153	45.2k	std::sort(xPath->segs, xPath->segs + xPath->length, &SplashXPathSeg::cmpMX);
154		#else
155		qsort(xPath->segs, xPath->length, sizeof(SplashXPathSeg),
156		&SplashXPathSeg::cmpMX);
157		#endif
158	45.2k	}
159
160		//--- initialize the active list
161	106k	pre->prev = NULL;
162	106k	pre->next = post;
163	106k	post->prev = pre;
164	106k	post->next = NULL;
165
166		//--- initialize the scan state
167	106k	nextSeg = 0;
168	106k	if (xPath->length) {
169	104k	yBottomI = xPath->segs[0].iy;
170	104k	if (aa) {
171	95.9k	yBottomI -= yBottomI % aaVert;
172	95.9k	}
173	104k	} else {
174	2.43k	yBottomI = 0;
175	2.43k	}
176	106k	yTopI = yBottomI - 1;
177	106k	if (aa) {
178	98.3k	yTop = (SplashCoord)yTopI / (SplashCoord)aaVert;
179	98.3k	yBottom = (SplashCoord)yBottomI / (SplashCoord)aaVert;
180	98.3k	} else {
181	8.59k	yTop = (SplashCoord)yTopI;
182	8.59k	yBottom = (SplashCoord)yBottomI;
183	8.59k	}
184
185	106k	resetDone = gTrue;
186	106k	resetAA = aa;
187	106k	}
188
189	87.0k	void SplashXPathScanner::skip(int newYBottomI, GBool aa) {
190	87.0k	SplashXPathSeg s0, s1,*s2;
191	87.0k	int iy;
192
193	87.0k	yTopI = newYBottomI - 1;
194	87.0k	yBottomI = newYBottomI;
195	87.0k	if (aa) {
196	78.9k	yTop = (SplashCoord)yTopI / (SplashCoord)aaVert;
197	78.9k	yBottom = (SplashCoord)yBottomI / (SplashCoord)aaVert;
198	78.9k	} else {
199	8.04k	yTop = (SplashCoord)yTopI;
200	8.04k	yBottom = (SplashCoord)yBottomI;
201	8.04k	}
202
203		//--- remove finished segments; update sx0, sx1, mx for active segments
204	87.0k	s0 = pre->next;
205	87.0k	while (s0 != post) {
206	0	s1 = s0->next;
207
208		// check for a finished segment
209	0	if (s0->y1 < yTop) {
210	0	removeSegment(s0);
211
212		// compute sx0, sx1, mx
213	0	} else {
214	0	if (s0->y0 >= yTop) {
215	0	s0->sx0 = s0->x0;
216	0	} else {
217	0	s0->sx0 = s0->x0 + (yTop - s0->y0) * s0->dxdy;
218	0	}
219	0	if (s0->y1 <= yBottom) {
220	0	s0->sx1 = s0->x1;
221	0	} else {
222	0	s0->sx1 = s0->x0 + (yBottom - s0->y0) * s0->dxdy;
223	0	}
224	0	s0->mx = (s0->sx0 <= s0->sx1) ? s0->sx0 : s0->sx1;
225	0	}
226
227	0	s0 = s1;
228	0	}
229
230		//--- check for intersections
231	87.0k	s0 = pre->next;
232	87.0k	if (s0 != post) {
233	0	s1 = s0->next;
234	0	while (s1 != post) {
235	0	if (s1->mx < s0->mx) {
236	0	for (s2 = s0->prev; s1->mx < s2->mx; s2 = s2->prev) ;
237	0	moveSegmentAfter(s1, s2);
238	0	} else {
239	0	s0 = s1;
240	0	}
241	0	s1 = s0->next;
242	0	}
243	0	}
244
245		//--- insert new segments with a merge sort
246		// - this has to be done one (sub)scanline at a time, because the
247		// inactive list is bin-sorted by (sub)scanline
248	7.07M	while (nextSeg < xPath->length && xPath->segs[nextSeg].iy <= yTopI) {
249		// the first inactive segment determines the next scanline to process
250	6.98M	iy = xPath->segs[nextSeg].iy;
251	6.98M	s0 = pre->next;
252	18.0M	do {
253	18.0M	s1 = &xPath->segs[nextSeg];
254	18.0M	++nextSeg;
255	18.0M	if (s1->y1 < yTop) {
256	16.6M	continue;
257	16.6M	}
258	1.36M	if (s1->y0 >= yTop) {
259	1.03k	s1->sx0 = s1->x0;
260	1.36M	} else {
261	1.36M	s1->sx0 = s1->x0 + (yTop - s1->y0) * s1->dxdy;
262	1.36M	}
263	1.36M	if (s1->y1 <= yBottom) {
264	12.0k	s1->sx1 = s1->x1;
265	1.35M	} else {
266	1.35M	s1->sx1 = s1->x0 + (yBottom - s1->y0) * s1->dxdy;
267	1.35M	}
268	1.36M	s1->mx = (s1->sx0 <= s1->sx1) ? s1->sx0 : s1->sx1;
269	1.36M	insertSegmentBefore(s1, s0);
270	18.0M	} while (nextSeg < xPath->length && xPath->segs[nextSeg].iy <= iy);
271	6.98M	}
272	87.0k	}
273
274	346k	void SplashXPathScanner::advance(GBool aa) {
275	346k	SplashXPathSeg s, sNext, *s1;
276
277	346k	yTopI = yBottomI;
278	346k	yTop = yBottom;
279	346k	yBottomI = yTopI + 1;
280	346k	if (aa) {
281	337k	yBottom = (SplashCoord)yBottomI / (SplashCoord)aaVert;
282	337k	} else {
283	8.57k	yBottom = (SplashCoord)yBottomI;
284	8.57k	}
285
286	346k	s = pre->next;
287	7.52M	while (s != post) {
288	7.17M	sNext = s->next;
289
290		// check for a finished segment
291	7.17M	if (s->y1 < yTop) {
292	1.77M	removeSegment(s);
293
294	5.39M	} else {
295
296		// compute sx0, sx1, mx
297	5.39M	s->sx0 = s->sx1;
298	5.39M	if (s->y1 <= yBottom) {
299	15.8k	s->sx1 = s->x1;
300	5.38M	} else {
301	5.38M	s->sx1 = s->x0 + (yBottom - s->y0) * s->dxdy;
302	5.38M	}
303	5.39M	s->mx = (s->sx0 <= s->sx1) ? s->sx0 : s->sx1;
304
305		// check for intersection
306	5.39M	if (s->mx < s->prev->mx) {
307	154M	for (s1 = s->prev->prev; s->mx < s1->mx; s1 = s1->prev) ;
308	390k	moveSegmentAfter(s, s1);
309	390k	}
310	5.39M	}
311
312	7.17M	s = sNext;
313	7.17M	}
314
315		// insert new segments
316	346k	s = pre->next;
317	2.27M	while (nextSeg < xPath->length && xPath->segs[nextSeg].iy <= yTopI) {
318	1.92M	s1 = &xPath->segs[nextSeg];
319	1.92M	++nextSeg;
320	1.95M	while (s1->mx > s->mx) {
321	27.0k	s = s->next;
322	27.0k	}
323	1.92M	insertSegmentBefore(s1, s);
324	1.92M	}
325	346k	}
326
327		void SplashXPathScanner::generatePixels(int x0, int x1, Guchar *line,
328	337k	int xMin, int xMax) {
329	337k	SplashXPathSeg *s;
330	337k	int fillCount, x, xEnd, ix0, ix1, t;
331
332	337k	fillCount = 0;
333	337k	x = x0 * aaHoriz;
334	337k	xEnd = (x1 + 1) * aaHoriz;
335	3.58M	for (s = pre->next; s != post && x < xEnd; s = s->next) {
336	3.24M	ix0 = splashFloor(s->sx0 * aaHoriz);
337	3.24M	ix1 = splashFloor(s->sx1 * aaHoriz);
338	3.24M	if (ix0 > ix1) {
339	728k	t = ix0; ix0 = ix1; ix1 = t;
340	728k	}
341	3.24M	if (!(fillCount & eoMask)) {
342	810k	if (ix0 > x) {
343	27.3k	x = ix0;
344	27.3k	}
345	810k	}
346	3.24M	if (ix1 >= xEnd) {
347	50.0k	ix1 = xEnd - 1;
348	50.0k	}
349	3.24M	if (x / aaHoriz < *xMin) {
350	79.2k	*xMin = x / aaHoriz;
351	79.2k	}
352	3.24M	if (ix1 / aaHoriz > *xMax) {
353	80.4k	*xMax = ix1 / aaHoriz;
354	80.4k	}
355	3.63M	for (; x <= ix1; ++x) {
356	385k	++line[x / aaHoriz];
357	385k	}
358	3.24M	if (s->y0 <= yTop && s->y1 > yTop) {
359	3.17M	fillCount += s->count;
360	3.17M	}
361	3.24M	}
362	337k	}
363
364		void SplashXPathScanner::generatePixelsBinary(int x0, int x1, Guchar *line,
365	8.57k	int xMin, int xMax) {
366	8.57k	SplashXPathSeg *s;
367	8.57k	int fillCount, x, xEnd, ix0, ix1, t;
368
369	8.57k	fillCount = 0;
370	8.57k	x = x0;
371	8.57k	xEnd = x1 + 1;
372	20.3k	for (s = pre->next; s != post && x < xEnd; s = s->next) {
373	11.7k	ix0 = splashFloor(s->sx0);
374	11.7k	ix1 = splashFloor(s->sx1);
375	11.7k	if (ix0 > ix1) {
376	1.54k	t = ix0; ix0 = ix1; ix1 = t;
377	1.54k	}
378	11.7k	if (!(fillCount & eoMask)) {
379	9.33k	if (ix0 > x) {
380	104	x = ix0;
381	104	}
382	9.33k	}
383	11.7k	if (ix1 >= xEnd) {
384	617	ix1 = xEnd - 1;
385	617	}
386	11.7k	if (x < *xMin) {
387	8.42k	*xMin = x;
388	8.42k	}
389	11.7k	if (ix1 > *xMax) {
390	8.38k	*xMax = ix1;
391	8.38k	}
392	20.0k	for (; x <= ix1; ++x) {
393	8.27k	line[x] = 255;
394	8.27k	}
395	11.7k	if (s->y0 <= yTop && s->y1 > yTop) {
396	10.3k	fillCount += s->count;
397	10.3k	}
398	11.7k	}
399	8.57k	}
400
401		void SplashXPathScanner::drawRectangleSpan(Guchar *line, int y,
402		int x0, int x1,
403	13.9k	int xMin, int xMax) {
404	13.9k	SplashCoord edge;
405	13.9k	Guchar pix;
406	13.9k	int xe, x;
407
408	13.9k	if (rectX0I > x1 \|\| rectX1I < x0) {
409	188	return;
410	188	}
411
412	13.7k	*xMin = x0 <= rectX0I ? rectX0I : x0;
413	13.7k	*xMax = rectX1I <= x1 ? rectX1I : x1;
414
415		//--- upper edge
416	13.7k	if (y == rectY0I) {
417
418		// handle a rectangle less than one pixel high
419	2.77k	if (rectY0I == rectY1I) {
420	2.63k	edge = xPath->rectY1 - xPath->rectY0;
421	2.63k	} else {
422	144	edge = (SplashCoord)1 - (xPath->rectY0 - rectY0I);
423	144	}
424
425		// upper left corner
426	2.77k	if (x0 <= rectX0I) {
427	2.54k	pix = (Guchar)splashCeil(edge
428	2.54k	* ((SplashCoord)1 - (xPath->rectX0 - rectX0I))
429	2.54k	* 255);
430	2.54k	if (pix < 16) {
431	2.34k	pix = 16;
432	2.34k	}
433	2.54k	line[rectX0I] = pix;
434	2.54k	x = rectX0I + 1;
435	2.54k	} else {
436	234	x = x0;
437	234	}
438
439		// upper right corner
440	2.77k	if (rectX1I <= x1) {
441	2.45k	pix = (Guchar)splashCeil(edge * (xPath->rectX1 - rectX1I) * 255);
442	2.45k	if (pix < 16) {
443	2.45k	pix = 16;
444	2.45k	}
445	2.45k	line[rectX1I] = pix;
446	2.45k	xe = rectX1I - 1;
447	2.45k	} else {
448	322	xe = x1;
449	322	}
450
451		// upper edge
452	2.77k	pix = (Guchar)splashCeil(edge * 255);
453	2.77k	if (pix < 16) {
454	2.57k	pix = 16;
455	2.57k	}
456	3.01k	for (; x <= xe; ++x) {
457	234	line[x] = pix;
458	234	}
459
460		//--- lower edge
461	10.9k	} else if (y == rectY1I) {
462	181	edge = xPath->rectY1 - rectY1I;
463
464		// lower left corner
465	181	if (x0 <= rectX0I) {
466	181	pix = (Guchar)splashCeil(edge
467	181	* ((SplashCoord)1 - (xPath->rectX0 - rectX0I))
468	181	* 255);
469	181	if (pix < 16) {
470	149	pix = 16;
471	149	}
472	181	line[rectX0I] = pix;
473	181	x = rectX0I + 1;
474	181	} else {
475	0	x = x0;
476	0	}
477
478		// lower right corner
479	181	if (rectX1I <= x1) {
480	181	pix = (Guchar)splashCeil(edge * (xPath->rectX1 - rectX1I) * 255);
481	181	if (pix < 16) {
482	181	pix = 16;
483	181	}
484	181	line[rectX1I] = pix;
485	181	xe = rectX1I - 1;
486	181	} else {
487	0	xe = x1;
488	0	}
489
490		// lower edge
491	181	pix = (Guchar)splashCeil(edge * 255);
492	181	if (pix < 16) {
493	149	pix = 16;
494	149	}
495	181	for (; x <= xe; ++x) {
496	0	line[x] = pix;
497	0	}
498
499		//--- between the upper and lower edges
500	10.7k	} else if (y > rectY0I && y < rectY1I) {
501
502		// left edge
503	10.5k	if (x0 <= rectX0I) {
504	7.61k	pix = (Guchar)splashCeil(((SplashCoord)1 - (xPath->rectX0 - rectX0I))
505	7.61k	* 255);
506	7.61k	if (pix < 16) {
507	0	pix = 16;
508	0	}
509	7.61k	line[rectX0I] = pix;
510	7.61k	x = rectX0I + 1;
511	7.61k	} else {
512	2.88k	x = x0;
513	2.88k	}
514
515		// right edge
516	10.5k	if (rectX1I <= x1) {
517	5.22k	pix = (Guchar)splashCeil((xPath->rectX1 - rectX1I) * 255);
518	5.22k	if (pix < 16) {
519	5.02k	pix = 16;
520	5.02k	}
521	5.22k	line[rectX1I] = pix;
522	5.22k	xe = rectX1I - 1;
523	5.28k	} else {
524	5.28k	xe = x1;
525	5.28k	}
526
527		// middle
528	13.3k	for (; x <= xe; ++x) {
529	2.82k	line[x] = 255;
530	2.82k	}
531	10.5k	}
532	13.7k	}
533
534		void SplashXPathScanner::drawRectangleSpanBinary(Guchar *line, int y,
535		int x0, int x1,
536	22	int xMin, int xMax) {
537	22	int xe, x;
538
539	22	if (y >= rectY0I && y <= rectY1I) {
540	22	if (x0 <= rectX0I) {
541	22	x = rectX0I;
542	22	} else {
543	0	x = x0;
544	0	}
545	22	*xMin = x;
546	22	if (rectX1I <= x1) {
547	22	xe = rectX1I;
548	22	} else {
549	0	xe = x1;
550	0	}
551	22	*xMax = xe;
552	44	for (; x <= xe; ++x) {
553	22	line[x] = 255;
554	22	}
555	22	}
556	22	}
557
558		void SplashXPathScanner::getSpan(Guchar *line, int y, int x0, int x1,
559	98.3k	int xMin, int xMax) {
560	98.3k	int iy, x, k;
561
562	98.3k	iy = y * aaVert;
563	98.3k	if (!resetDone \|\| !resetAA) {
564	38.7k	reset(gTrue, gTrue);
565	59.5k	} else if (yBottomI > iy) {
566	59.5k	reset(gTrue, gFalse);
567	59.5k	}
568	98.3k	memset(line + x0, 0, x1 - x0 + 1);
569
570	98.3k	*xMin = x1 + 1;
571	98.3k	*xMax = x0 - 1;
572
573	98.3k	if (xPath->isRect) {
574	13.9k	drawRectangleSpan(line, y, x0, x1, xMin, xMax);
575	13.9k	return;
576	13.9k	}
577
578	84.4k	if (yBottomI < iy) {
579	78.9k	skip(iy, gTrue);
580	78.9k	}
581	422k	for (k = 0; k < aaVert; ++k, ++iy) {
582	337k	advance(gTrue);
583	337k	generatePixels(x0, x1, line, xMin, xMax);
584	337k	}
585
586	84.4k	#if !ANTIALIAS_256
587	162k	for (x = xMin; x <= xMax; ++x) {
588	77.8k	line[x] = map16to255[line[x]];
589	77.8k	}
590	84.4k	#endif
591	84.4k	}
592
593		void SplashXPathScanner::getSpanBinary(Guchar *line, int y, int x0, int x1,
594	8.59k	int xMin, int xMax) {
595	8.59k	int iy;
596
597	8.59k	iy = y;
598	8.59k	if (!resetDone \|\| resetAA) {
599	6.51k	reset(gFalse, gTrue);
600	6.51k	} else if (yBottomI > iy) {
601	2.08k	reset(gFalse, gFalse);
602	2.08k	}
603	8.59k	memset(line + x0, 0, x1 - x0 + 1);
604
605	8.59k	*xMin = x1 + 1;
606	8.59k	*xMax = x0 - 1;
607
608	8.59k	if (xPath->isRect) {
609	22	drawRectangleSpanBinary(line, y, x0, x1, xMin, xMax);
610	22	return;
611	22	}
612
613	8.57k	if (yBottomI < iy) {
614	8.04k	skip(iy, gFalse);
615	8.04k	}
616	8.57k	advance(gFalse);
617	8.57k	generatePixelsBinary(x0, x1, line, xMin, xMax);
618	8.57k	}