pdftops/SplashXPathScanner.h

   1 //========================================================================
   2 //
   3 // SplashXPathScanner.h
   4 //
   5 //========================================================================
   6
   7 #ifndef SPLASHXPATHSCANNER_H
   8 #define SPLASHXPATHSCANNER_H
   9
  10 #include <config.h>
  11
  12 #ifdef USE_GCC_PRAGMAS
  13 #pragma interface
  14 #endif
  15
  16 #include "SplashTypes.h"
  17
  18 class SplashXPath;
  19 struct SplashIntersect;
  20
  21 //------------------------------------------------------------------------
  22 // SplashXPathScanner
  23 //------------------------------------------------------------------------
  24
  25 class SplashXPathScanner {
  26 public:
  27
  28   // Create a new SplashXPathScanner object.  <xPathA> must be sorted.
  29   SplashXPathScanner(SplashXPath *xPathA, GBool eoA);
  30
  31   ~SplashXPathScanner();
  32
  33   // Return the path's bounding box.
  34   void getBBox(int *xMinA, int *yMinA, int *xMaxA, int *yMaxA)
  35     { *xMinA = xMin; *yMinA = yMin; *xMaxA = xMax; *yMaxA = yMax; }
  36
  37   // Return the min/max x values for the span at <y>.
  38   void getSpanBounds(int y, int *spanXMin, int *spanXMax);
  39
  40   // Returns true if (<x>,<y>) is inside the path.
  41   GBool test(int x, int y);
  42
  43   // Returns true if the entire span ([<x0>,<x1>], <y>) is inside the
  44   // path.
  45   GBool testSpan(int x0, int x1, int y);
  46
  47   // Returns the next span inside the path at <y>.  If <y> is
  48   // different than the previous call to getNextSpan, this returns the
  49   // first span at <y>; otherwise it returns the next span (relative
  50   // to the previous call to getNextSpan).  Returns false if there are
  51   // no more spans at <y>.
  52   GBool getNextSpan(int y, int *x0, int *x1);
  53
  54 private:
  55
  56   void computeIntersections(int y);
  57
  58   SplashXPath *xPath;
  59   GBool eo;
  60   int xMin, yMin, xMax, yMax;
  61
  62   int interY;                   // current y value
  63   int interIdx;                 // current index into <inter> - used by
  64                                 //   getNextSpan
  65   int interCount;               // current EO/NZWN counter - used by
  66                                 //   getNextSpan
  67   int xPathIdx;                 // current index into <xPath> - used by
  68                                 //   computeIntersections
  69   SplashIntersect *inter;       // intersections array for <interY>
  70   int interLen;                 // number of intersections in <inter>
  71   int interSize;                // size of the <inter> array
  72 };
  73
  74 #endif