rosapps/smartpdf/poppler/splash/SplashPath.cc

   1 //========================================================================
   2 //
   3 // SplashPath.cc
   4 //
   5 //========================================================================
   6
   7 #include <config.h>
   8
   9 #ifdef USE_GCC_PRAGMAS
  10 #pragma implementation
  11 #endif
  12
  13 #include <string.h>
  14 #include "goo/gmem.h"
  15 #include "SplashErrorCodes.h"
  16 #include "SplashPath.h"
  17
  18 //------------------------------------------------------------------------
  19 // SplashPath
  20 //------------------------------------------------------------------------
  21
  22 // A path can be in three possible states:
  23 //
  24 // 1. no current point -- zero or more finished subpaths
  25 //    [curSubpath == length]
  26 //
  27 // 2. one point in subpath
  28 //    [curSubpath == length - 1]
  29 //
  30 // 3. open subpath with two or more points
  31 //    [curSubpath < length - 1]
  32
  33 SplashPath::SplashPath() {
  34   pts = NULL;
  35   flags = NULL;
  36   length = size = 0;
  37   curSubpath = 0;
  38 }
  39
  40 SplashPath::SplashPath(SplashPath *path) {
  41   length = path->length;
  42   size = path->size;
  43   pts = (SplashPathPoint *)gmallocn(size, sizeof(SplashPathPoint));
  44   flags = (Guchar *)gmallocn(size, sizeof(Guchar));
  45   memcpy(pts, path->pts, length * sizeof(SplashPathPoint));
  46   memcpy(flags, path->flags, length * sizeof(Guchar));
  47   curSubpath = path->curSubpath;
  48 }
  49
  50 SplashPath::~SplashPath() {
  51   gfree(pts);
  52   gfree(flags);
  53 }
  54
  55 // Add space for <nPts> more points.
  56 void SplashPath::grow(int nPts) {
  57   if (length + nPts > size) {
  58     if (size == 0) {
  59       size = 32;
  60     }
  61     while (size < length + nPts) {
  62       size *= 2;
  63     }
  64     pts = (SplashPathPoint *)greallocn(pts, size, sizeof(SplashPathPoint));
  65     flags = (Guchar *)greallocn(flags, size, sizeof(Guchar));
  66   }
  67 }
  68
  69 void SplashPath::append(SplashPath *path) {
  70   int i;
  71
  72   curSubpath = length + path->curSubpath;
  73   grow(path->length);
  74   for (i = 0; i < path->length; ++i) {
  75     pts[length] = path->pts[i];
  76     flags[length] = path->flags[i];
  77     ++length;
  78   }
  79 }
  80
  81 SplashError SplashPath::moveTo(SplashCoord x, SplashCoord y) {
  82   if (onePointSubpath()) {
  83     return splashErrBogusPath;
  84   }
  85   grow(1);
  86   pts[length].x = x;
  87   pts[length].y = y;
  88   flags[length] = splashPathFirst | splashPathLast;
  89   curSubpath = length++;
  90   return splashOk;
  91 }
  92
  93 SplashError SplashPath::lineTo(SplashCoord x, SplashCoord y) {
  94   if (noCurrentPoint()) {
  95     return splashErrNoCurPt;
  96   }
  97   flags[length-1] &= ~splashPathLast;
  98   grow(1);
  99   pts[length].x = x;
 100   pts[length].y = y;
 101   flags[length] = splashPathLast;
 102   ++length;
 103   return splashOk;
 104 }
 105
 106 SplashError SplashPath::curveTo(SplashCoord x1, SplashCoord y1,
 107                                 SplashCoord x2, SplashCoord y2,
 108                                 SplashCoord x3, SplashCoord y3) {
 109   if (noCurrentPoint()) {
 110     return splashErrNoCurPt;
 111   }
 112   flags[length-1] &= ~splashPathLast;
 113   grow(3);
 114   pts[length].x = x1;
 115   pts[length].y = y1;
 116   flags[length] = splashPathCurve;
 117   ++length;
 118   pts[length].x = x2;
 119   pts[length].y = y2;
 120   flags[length] = splashPathCurve;
 121   ++length;
 122   pts[length].x = x3;
 123   pts[length].y = y3;
 124   flags[length] = splashPathLast;
 125   ++length;
 126   return splashOk;
 127 }
 128
 129 SplashError SplashPath::arcCWTo(SplashCoord x1, SplashCoord y1,
 130                                 SplashCoord xc, SplashCoord yc) {
 131   if (noCurrentPoint()) {
 132     return splashErrNoCurPt;
 133   }
 134   flags[length-1] &= ~splashPathLast;
 135   grow(2);
 136   pts[length].x = xc;
 137   pts[length].y = yc;
 138   flags[length] = splashPathArcCW;
 139   ++length;
 140   pts[length].x = x1;
 141   pts[length].y = y1;
 142   flags[length] = splashPathLast;
 143   ++length;
 144   return splashOk;
 145 }
 146
 147 SplashError SplashPath::close() {
 148   if (noCurrentPoint()) {
 149     return splashErrNoCurPt;
 150   }
 151   if (curSubpath == length - 1 ||
 152       pts[length - 1].x != pts[curSubpath].x ||
 153       pts[length - 1].y != pts[curSubpath].y) {
 154     lineTo(pts[curSubpath].x, pts[curSubpath].y);
 155   }
 156   flags[curSubpath] |= splashPathClosed;
 157   flags[length - 1] |= splashPathClosed;
 158   curSubpath = length;
 159   return splashOk;
 160 }
 161
 162 void SplashPath::offset(SplashCoord dx, SplashCoord dy) {
 163   int i;
 164
 165   for (i = 0; i < length; ++i) {
 166     pts[i].x += dx;
 167     pts[i].y += dy;
 168   }
 169 }
 170
 171 GBool SplashPath::getCurPt(SplashCoord *x, SplashCoord *y) {
 172   if (noCurrentPoint()) {
 173     return gFalse;
 174   }
 175   *x = pts[length - 1].x;
 176   *y = pts[length - 1].y;
 177   return gTrue;
 178 }