pdftops/SplashClip.cxx

   1 //========================================================================
   2 //
   3 // SplashClip.cc
   4 //
   5 //========================================================================
   6
   7 #include <config.h>
   8
   9 #ifdef USE_GCC_PRAGMAS
  10 #pragma implementation
  11 #endif
  12
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include "gmem.h"
  16 #include "SplashErrorCodes.h"
  17 #include "SplashMath.h"
  18 #include "SplashPath.h"
  19 #include "SplashXPath.h"
  20 #include "SplashXPathScanner.h"
  21 #include "SplashClip.h"
  22
  23 //------------------------------------------------------------------------
  24 // SplashClip.flags
  25 //------------------------------------------------------------------------
  26
  27 #define splashClipEO       0x01 // use even-odd rule
  28
  29 //------------------------------------------------------------------------
  30 // SplashClip
  31 //------------------------------------------------------------------------
  32
  33 SplashClip::SplashClip(SplashCoord x0, SplashCoord y0,
  34                        SplashCoord x1, SplashCoord y1) {
  35   if (x0 < x1) {
  36     xMin = splashFloor(x0);
  37     xMax = splashFloor(x1);
  38   } else {
  39     xMin = splashFloor(x1);
  40     xMax = splashFloor(x0);
  41   }
  42   if (y0 < y1) {
  43     yMin = splashFloor(y0);
  44     yMax = splashFloor(y1);
  45   } else {
  46     yMin = splashFloor(y1);
  47     yMax = splashFloor(y0);
  48   }
  49   paths = NULL;
  50   flags = NULL;
  51   scanners = NULL;
  52   length = size = 0;
  53 }
  54
  55 SplashClip::SplashClip(SplashClip *clip) {
  56   int i;
  57
  58   xMin = clip->xMin;
  59   yMin = clip->yMin;
  60   xMax = clip->xMax;
  61   yMax = clip->yMax;
  62   length = clip->length;
  63   size = clip->size;
  64   paths = (SplashXPath **)gmallocn(size, sizeof(SplashXPath *));
  65   flags = (Guchar *)gmallocn(size, sizeof(Guchar));
  66   scanners = (SplashXPathScanner **)
  67                  gmallocn(size, sizeof(SplashXPathScanner *));
  68   for (i = 0; i < length; ++i) {
  69     paths[i] = clip->paths[i]->copy();
  70     flags[i] = clip->flags[i];
  71     scanners[i] = new SplashXPathScanner(paths[i], flags[i] & splashClipEO);
  72   }
  73 }
  74
  75 SplashClip::~SplashClip() {
  76   int i;
  77
  78   for (i = 0; i < length; ++i) {
  79     delete paths[i];
  80     delete scanners[i];
  81   }
  82   gfree(paths);
  83   gfree(flags);
  84   gfree(scanners);
  85 }
  86
  87 void SplashClip::grow(int nPaths) {
  88   if (length + nPaths > size) {
  89     if (size == 0) {
  90       size = 32;
  91     }
  92     while (size < length + nPaths) {
  93       size *= 2;
  94     }
  95     paths = (SplashXPath **)greallocn(paths, size, sizeof(SplashXPath *));
  96     flags = (Guchar *)greallocn(flags, size, sizeof(Guchar));
  97     scanners = (SplashXPathScanner **)
  98                    greallocn(scanners, size, sizeof(SplashXPathScanner *));
  99   }
 100 }
 101
 102 void SplashClip::resetToRect(SplashCoord x0, SplashCoord y0,
 103                              SplashCoord x1, SplashCoord y1) {
 104   int i;
 105
 106   for (i = 0; i < length; ++i) {
 107     delete paths[i];
 108     delete scanners[i];
 109   }
 110   gfree(paths);
 111   gfree(flags);
 112   gfree(scanners);
 113   paths = NULL;
 114   flags = NULL;
 115   scanners = NULL;
 116   length = size = 0;
 117
 118   if (x0 < x1) {
 119     xMin = splashFloor(x0);
 120     xMax = splashFloor(x1);
 121   } else {
 122     xMin = splashFloor(x1);
 123     xMax = splashFloor(x0);
 124   }
 125   if (y0 < y1) {
 126     yMin = splashFloor(y0);
 127     yMax = splashFloor(y1);
 128   } else {
 129     yMin = splashFloor(y1);
 130     yMax = splashFloor(y0);
 131   }
 132 }
 133
 134 SplashError SplashClip::clipToRect(SplashCoord x0, SplashCoord y0,
 135                                    SplashCoord x1, SplashCoord y1) {
 136   int x0I, y0I, x1I, y1I;
 137
 138   if (x0 < x1) {
 139     x0I = splashFloor(x0);
 140     x1I = splashFloor(x1);
 141   } else {
 142     x0I = splashFloor(x1);
 143     x1I = splashFloor(x0);
 144   }
 145   if (x0I > xMin) {
 146     xMin = x0I;
 147   }
 148   if (x1I < xMax) {
 149     xMax = x1I;
 150   }
 151   if (y0 < y1) {
 152     y0I = splashFloor(y0);
 153     y1I = splashFloor(y1);
 154   } else {
 155     y0I = splashFloor(y1);
 156     y1I = splashFloor(y0);
 157   }
 158   if (y0I > yMin) {
 159     yMin = y0I;
 160   }
 161   if (y1I < yMax) {
 162     yMax = y1I;
 163   }
 164   return splashOk;
 165 }
 166
 167 SplashError SplashClip::clipToPath(SplashPath *path, SplashCoord flatness,
 168                                    GBool eo) {
 169   SplashXPath *xPath;
 170
 171   xPath = new SplashXPath(path, flatness, gTrue);
 172
 173   // check for an empty path
 174   if (xPath->length == 0) {
 175     xMax = xMin - 1;
 176     yMax = yMin - 1;
 177     delete xPath;
 178
 179   // check for a rectangle
 180   } else if (xPath->length == 4 &&
 181       ((xPath->segs[0].x0 == xPath->segs[0].x1 &&
 182         xPath->segs[0].x0 == xPath->segs[1].x0 &&
 183         xPath->segs[0].x0 == xPath->segs[3].x1 &&
 184         xPath->segs[2].x0 == xPath->segs[2].x1 &&
 185         xPath->segs[2].x0 == xPath->segs[1].x1 &&
 186         xPath->segs[2].x0 == xPath->segs[3].x0 &&
 187         xPath->segs[1].y0 == xPath->segs[1].y1 &&
 188         xPath->segs[1].y0 == xPath->segs[0].y1 &&
 189         xPath->segs[1].y0 == xPath->segs[2].y0 &&
 190         xPath->segs[3].y0 == xPath->segs[3].y1 &&
 191         xPath->segs[3].y0 == xPath->segs[0].y0 &&
 192         xPath->segs[3].y0 == xPath->segs[2].y1) ||
 193        (xPath->segs[0].y0 == xPath->segs[0].y1 &&
 194         xPath->segs[0].y0 == xPath->segs[1].y0 &&
 195         xPath->segs[0].y0 == xPath->segs[3].y1 &&
 196         xPath->segs[2].y0 == xPath->segs[2].y1 &&
 197         xPath->segs[2].y0 == xPath->segs[1].y1 &&
 198         xPath->segs[2].y0 == xPath->segs[3].y0 &&
 199         xPath->segs[1].x0 == xPath->segs[1].x1 &&
 200         xPath->segs[1].x0 == xPath->segs[0].x1 &&
 201         xPath->segs[1].x0 == xPath->segs[2].x0 &&
 202         xPath->segs[3].x0 == xPath->segs[3].x1 &&
 203         xPath->segs[3].x0 == xPath->segs[0].x0 &&
 204         xPath->segs[3].x0 == xPath->segs[2].x1))) {
 205     clipToRect(xPath->segs[0].x0, xPath->segs[0].y0,
 206                xPath->segs[2].x0, xPath->segs[2].y0);
 207     delete xPath;
 208
 209   } else {
 210     grow(1);
 211     xPath->sort();
 212     paths[length] = xPath;
 213     flags[length] = eo ? splashClipEO : 0;
 214     scanners[length] = new SplashXPathScanner(xPath, eo);
 215     ++length;
 216   }
 217
 218   return splashOk;
 219 }
 220
 221 GBool SplashClip::test(int x, int y) {
 222   int i;
 223
 224   // check the rectangle
 225   if (x < xMin || x > xMax || y < yMin || y > yMax) {
 226     return gFalse;
 227   }
 228
 229   // check the paths
 230   for (i = 0; i < length; ++i) {
 231     if (!scanners[i]->test(x, y)) {
 232       return gFalse;
 233     }
 234   }
 235
 236   return gTrue;
 237 }
 238
 239 SplashClipResult SplashClip::testRect(int rectXMin, int rectYMin,
 240                                       int rectXMax, int rectYMax) {
 241   if (rectXMax < xMin || rectXMin > xMax ||
 242       rectYMax < yMin || rectYMin > yMax) {
 243     return splashClipAllOutside;
 244   }
 245   if (rectXMin >= xMin && rectXMax <= xMax &&
 246       rectYMin >= yMin && rectYMax <= yMax &&
 247       length == 0) {
 248     return splashClipAllInside;
 249   }
 250   return splashClipPartial;
 251 }
 252
 253 SplashClipResult SplashClip::testSpan(int spanXMin, int spanXMax, int spanY) {
 254   int i;
 255
 256   if (spanXMax < xMin || spanXMin > xMax ||
 257       spanY < yMin || spanY > yMax) {
 258     return splashClipAllOutside;
 259   }
 260   if (!(spanXMin >= xMin && spanXMax <= xMax &&
 261         spanY >= yMin && spanY <= yMax)) {
 262     return splashClipPartial;
 263   }
 264   for (i = 0; i < length; ++i) {
 265     if (!scanners[i]->testSpan(xMin, xMax, spanY)) {
 266       return splashClipPartial;
 267     }
 268   }
 269   return splashClipAllInside;
 270 }