source/libs/poppler/poppler-src/splash/SplashXPath.h

   1 //========================================================================
   2 //
   3 // SplashXPath.h
   4 //
   5 //========================================================================
   6
   7 //========================================================================
   8 //
   9 // Modified under the Poppler project - http://poppler.freedesktop.org
  10 //
  11 // All changes made under the Poppler project to this file are licensed
  12 // under GPL version 2 or later
  13 //
  14 // Copyright (C) 2013 Thomas Freitag <Thomas.Freitag@alfa.de>
  15 //
  16 // To see a description of the changes please see the Changelog file that
  17 // came with your tarball or type make ChangeLog if you are building from git
  18 //
  19 //========================================================================
  20
  21 #ifndef SPLASHXPATH_H
  22 #define SPLASHXPATH_H
  23
  24 #ifdef USE_GCC_PRAGMAS
  25 #pragma interface
  26 #endif
  27
  28 #include "SplashTypes.h"
  29
  30 class SplashPath;
  31 struct SplashXPathAdjust;
  32
  33 //------------------------------------------------------------------------
  34
  35 #define splashMaxCurveSplits (1 << 10)
  36
  37 //------------------------------------------------------------------------
  38 // SplashXPathSeg
  39 //------------------------------------------------------------------------
  40
  41 struct SplashXPathSeg {
  42   SplashCoord x0, y0;           // first endpoint
  43   SplashCoord x1, y1;           // second endpoint
  44   SplashCoord dxdy;             // slope: delta-x / delta-y
  45   SplashCoord dydx;             // slope: delta-y / delta-x
  46   Guint flags;
  47 };
  48
  49 #define splashXPathHoriz   0x01 // segment is vertical (y0 == y1)
  50                                 //   (dxdy is undef)
  51 #define splashXPathVert    0x02 // segment is horizontal (x0 == x1)
  52                                 //   (dydx is undef)
  53 #define splashXPathFlip    0x04 // y0 > y1
  54
  55 //------------------------------------------------------------------------
  56 // SplashXPath
  57 //------------------------------------------------------------------------
  58
  59 class SplashXPath {
  60 public:
  61
  62   // Expands (converts to segments) and flattens (converts curves to
  63   // lines) <path>.  Transforms all points from user space to device
  64   // space, via <matrix>.  If <closeSubpaths> is true, closes all open
  65   // subpaths.
  66   SplashXPath(SplashPath *path, SplashCoord *matrix,
  67               SplashCoord flatness, GBool closeSubpaths,
  68               GBool adjustLines = gFalse, int linePosI = 0);
  69
  70   // Copy an expanded path.
  71   SplashXPath *copy() { return new SplashXPath(this); }
  72
  73   ~SplashXPath();
  74
  75   // Multiply all coordinates by splashAASize, in preparation for
  76   // anti-aliased rendering.
  77   void aaScale();
  78
  79   // Sort by upper coordinate (lower y), in y-major order.
  80   void sort();
  81
  82 protected:
  83
  84   SplashXPath(SplashXPath *xPath);
  85   void transform(SplashCoord *matrix, SplashCoord xi, SplashCoord yi,
  86                  SplashCoord *xo, SplashCoord *yo);
  87   void strokeAdjust(SplashXPathAdjust *adjust,
  88                     SplashCoord *xp, SplashCoord *yp);
  89   void grow(int nSegs);
  90   void addCurve(SplashCoord x0, SplashCoord y0,
  91                 SplashCoord x1, SplashCoord y1,
  92                 SplashCoord x2, SplashCoord y2,
  93                 SplashCoord x3, SplashCoord y3,
  94                 SplashCoord flatness,
  95                 GBool first, GBool last, GBool end0, GBool end1);
  96   void addSegment(SplashCoord x0, SplashCoord y0,
  97                   SplashCoord x1, SplashCoord y1);
  98
  99   SplashXPathSeg *segs;
 100   int length, size;             // length and size of segs array
 101
 102   friend class SplashXPathScanner;
 103   friend class SplashClip;
 104   friend class Splash;
 105 };
 106
 107 #endif