granicus.if.org Git - imagemagick/blob - magick/draw.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                        DDDD   RRRR    AAA   W   W                           %
   7 %                        D   D  R   R  A   A  W   W                           %
   8 %                        D   D  RRRR   AAAAA  W W W                           %
   9 %                        D   D  R RN   A   A  WW WW                           %
  10 %                        DDDD   R  R   A   A  W   W                           %
  11 %                                                                             %
  12 %                                                                             %
  13 %                     MagickCore Image Drawing Methods                        %
  14 %                                                                             %
  15 %                                                                             %
  16 %                              Software Design                                %
  17 %                                John Cristy                                  %
  18 %                                 July 1998                                   %
  19 %                                                                             %
  20 %                                                                             %
  21 %  Copyright 1999-2010 ImageMagick Studio LLC, a non-profit organization      %
  22 %  dedicated to making software imaging solutions freely available.           %
  23 %                                                                             %
  24 %  You may not use this file except in compliance with the License.  You may  %
  25 %  obtain a copy of the License at                                            %
  26 %                                                                             %
  27 %    http://www.imagemagick.org/script/license.php                            %
  28 %                                                                             %
  29 %  Unless required by applicable law or agreed to in writing, software        %
  30 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  31 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  32 %  See the License for the specific language governing permissions and        %
  33 %  limitations under the License.                                             %
  34 %                                                                             %
  35 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  36 %
  37 % Bill Radcliffe of Corbis (www.corbis.com) contributed the polygon
  38 % rendering code based on Paul Heckbert's "Concave Polygon Scan Conversion",
  39 % Graphics Gems, 1990.  Leonard Rosenthal and David Harr of Appligent
  40 % (www.appligent.com) contributed the dash pattern, linecap stroking
  41 % algorithm, and minor rendering improvements.
  42 %
  43 */
  44 \f
  45 /*
  46   Include declarations.
  47 */
  48 #include "magick/studio.h"
  49 #include "magick/annotate.h"
  50 #include "magick/artifact.h"
  51 #include "magick/blob.h"
  52 #include "magick/cache.h"
  53 #include "magick/cache-view.h"
  54 #include "magick/color.h"
  55 #include "magick/composite.h"
  56 #include "magick/composite-private.h"
  57 #include "magick/constitute.h"
  58 #include "magick/draw.h"
  59 #include "magick/draw-private.h"
  60 #include "magick/enhance.h"
  61 #include "magick/exception.h"
  62 #include "magick/exception-private.h"
  63 #include "magick/gem.h"
  64 #include "magick/geometry.h"
  65 #include "magick/image-private.h"
  66 #include "magick/list.h"
  67 #include "magick/log.h"
  68 #include "magick/monitor.h"
  69 #include "magick/monitor-private.h"
  70 #include "magick/option.h"
  71 #include "magick/paint.h"
  72 #include "magick/pixel-private.h"
  73 #include "magick/property.h"
  74 #include "magick/resample.h"
  75 #include "magick/resample-private.h"
  76 #include "magick/string_.h"
  77 #include "magick/string-private.h"
  78 #include "magick/thread-private.h"
  79 #include "magick/token.h"
  80 #include "magick/transform.h"
  81 #include "magick/utility.h"
  82 \f
  83 /*
  84   Define declarations.
  85 */
  86 #define BezierQuantum  200
  87 \f
  88 /*
  89   Typedef declarations.
  90 */
  91 typedef struct _EdgeInfo
  92 {
  93   SegmentInfo
  94     bounds;
  95
  96   MagickRealType
  97     scanline;
  98
  99   PointInfo
 100     *points;
 101
 102   size_t
 103     number_points;
 104
 105   ssize_t
 106     direction;
 107
 108   MagickBooleanType
 109     ghostline;
 110
 111   size_t
 112     highwater;
 113 } EdgeInfo;
 114
 115 typedef struct _ElementInfo
 116 {
 117   MagickRealType
 118     cx,
 119     cy,
 120     major,
 121     minor,
 122     angle;
 123 } ElementInfo;
 124
 125 typedef struct _PolygonInfo
 126 {
 127   EdgeInfo
 128     *edges;
 129
 130   size_t
 131     number_edges;
 132 } PolygonInfo;
 133
 134 typedef enum
 135 {
 136   MoveToCode,
 137   OpenCode,
 138   GhostlineCode,
 139   LineToCode,
 140   EndCode
 141 } PathInfoCode;
 142
 143 typedef struct _PathInfo
 144 {
 145   PointInfo
 146     point;
 147
 148   PathInfoCode
 149     code;
 150 } PathInfo;
 151 \f
 152 /*
 153   Forward declarations.
 154 */
 155 static MagickBooleanType
 156   DrawStrokePolygon(Image *,const DrawInfo *,const PrimitiveInfo *);
 157
 158 static PrimitiveInfo
 159   *TraceStrokePolygon(const DrawInfo *,const PrimitiveInfo *);
 160
 161 static size_t
 162   TracePath(PrimitiveInfo *,const char *);
 163
 164 static void
 165   TraceArc(PrimitiveInfo *,const PointInfo,const PointInfo,const PointInfo),
 166   TraceArcPath(PrimitiveInfo *,const PointInfo,const PointInfo,const PointInfo,
 167     const MagickRealType,const MagickBooleanType,const MagickBooleanType),
 168   TraceBezier(PrimitiveInfo *,const size_t),
 169   TraceCircle(PrimitiveInfo *,const PointInfo,const PointInfo),
 170   TraceEllipse(PrimitiveInfo *,const PointInfo,const PointInfo,const PointInfo),
 171   TraceLine(PrimitiveInfo *,const PointInfo,const PointInfo),
 172   TraceRectangle(PrimitiveInfo *,const PointInfo,const PointInfo),
 173   TraceRoundRectangle(PrimitiveInfo *,const PointInfo,const PointInfo,
 174     PointInfo),
 175   TraceSquareLinecap(PrimitiveInfo *,const size_t,const MagickRealType);
 176 \f
 177 /*
 178 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 179 %                                                                             %
 180 %                                                                             %
 181 %                                                                             %
 182 %   A c q u i r e D r a w I n f o                                             %
 183 %                                                                             %
 184 %                                                                             %
 185 %                                                                             %
 186 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 187 %
 188 %  AcquireDrawInfo() returns a DrawInfo structure properly initialized.
 189 %
 190 %  The format of the AcquireDrawInfo method is:
 191 %
 192 %      DrawInfo *AcquireDrawInfo(void)
 193 %
 194 */
 195 MagickExport DrawInfo *AcquireDrawInfo(void)
 196 {
 197   DrawInfo
 198     *draw_info;
 199
 200   draw_info=(DrawInfo *) AcquireAlignedMemory(1,sizeof(*draw_info));
 201   if (draw_info == (DrawInfo *) NULL)
 202     ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
 203   GetDrawInfo((ImageInfo *) NULL,draw_info);
 204   return(draw_info);
 205 }
 206 \f
 207 /*
 208 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 209 %                                                                             %
 210 %                                                                             %
 211 %                                                                             %
 212 %   C l o n e D r a w I n f o                                                 %
 213 %                                                                             %
 214 %                                                                             %
 215 %                                                                             %
 216 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 217 %
 218 %  CloneDrawInfo() makes a copy of the given draw info structure.  If NULL
 219 %  is specified, a new image info structure is created initialized to
 220 %  default values.
 221 %
 222 %  The format of the CloneDrawInfo method is:
 223 %
 224 %      DrawInfo *CloneDrawInfo(const ImageInfo *image_info,
 225 %        const DrawInfo *draw_info)
 226 %
 227 %  A description of each parameter follows:
 228 %
 229 %    o image_info: the image info.
 230 %
 231 %    o draw_info: the draw info.
 232 %
 233 */
 234 MagickExport DrawInfo *CloneDrawInfo(const ImageInfo *image_info,
 235   const DrawInfo *draw_info)
 236 {
 237   DrawInfo
 238     *clone_info;
 239
 240   clone_info=(DrawInfo *) AcquireAlignedMemory(1,sizeof(*clone_info));
 241   if (clone_info == (DrawInfo *) NULL)
 242     ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
 243   GetDrawInfo(image_info,clone_info);
 244   if (draw_info == (DrawInfo *) NULL)
 245     return(clone_info);
 246   if (clone_info->primitive != (char *) NULL)
 247     (void) CloneString(&clone_info->primitive,draw_info->primitive);
 248   if (draw_info->geometry != (char *) NULL)
 249     (void) CloneString(&clone_info->geometry,draw_info->geometry);
 250   clone_info->viewbox=draw_info->viewbox;
 251   clone_info->affine=draw_info->affine;
 252   clone_info->gravity=draw_info->gravity;
 253   clone_info->fill=draw_info->fill;
 254   clone_info->stroke=draw_info->stroke;
 255   clone_info->stroke_width=draw_info->stroke_width;
 256   if (draw_info->fill_pattern != (Image *) NULL)
 257     clone_info->fill_pattern=CloneImage(draw_info->fill_pattern,0,0,MagickTrue,
 258       &draw_info->fill_pattern->exception);
 259   else
 260     if (draw_info->tile != (Image *) NULL)
 261       clone_info->fill_pattern=CloneImage(draw_info->tile,0,0,MagickTrue,
 262         &draw_info->tile->exception);
 263   clone_info->tile=NewImageList();  /* tile is deprecated */
 264   if (draw_info->stroke_pattern != (Image *) NULL)
 265     clone_info->stroke_pattern=CloneImage(draw_info->stroke_pattern,0,0,
 266       MagickTrue,&draw_info->stroke_pattern->exception);
 267   clone_info->stroke_antialias=draw_info->stroke_antialias;
 268   clone_info->text_antialias=draw_info->text_antialias;
 269   clone_info->fill_rule=draw_info->fill_rule;
 270   clone_info->linecap=draw_info->linecap;
 271   clone_info->linejoin=draw_info->linejoin;
 272   clone_info->miterlimit=draw_info->miterlimit;
 273   clone_info->dash_offset=draw_info->dash_offset;
 274   clone_info->decorate=draw_info->decorate;
 275   clone_info->compose=draw_info->compose;
 276   if (draw_info->text != (char *) NULL)
 277     (void) CloneString(&clone_info->text,draw_info->text);
 278   if (draw_info->font != (char *) NULL)
 279     (void) CloneString(&clone_info->font,draw_info->font);
 280   if (draw_info->metrics != (char *) NULL)
 281     (void) CloneString(&clone_info->metrics,draw_info->metrics);
 282   if (draw_info->family != (char *) NULL)
 283     (void) CloneString(&clone_info->family,draw_info->family);
 284   clone_info->style=draw_info->style;
 285   clone_info->stretch=draw_info->stretch;
 286   clone_info->weight=draw_info->weight;
 287   if (draw_info->encoding != (char *) NULL)
 288     (void) CloneString(&clone_info->encoding,draw_info->encoding);
 289   clone_info->pointsize=draw_info->pointsize;
 290   clone_info->kerning=draw_info->kerning;
 291   clone_info->interline_spacing=draw_info->interline_spacing;
 292   clone_info->interword_spacing=draw_info->interword_spacing;
 293   clone_info->direction=draw_info->direction;
 294   if (draw_info->density != (char *) NULL)
 295     (void) CloneString(&clone_info->density,draw_info->density);
 296   clone_info->align=draw_info->align;
 297   clone_info->undercolor=draw_info->undercolor;
 298   clone_info->border_color=draw_info->border_color;
 299   if (draw_info->server_name != (char *) NULL)
 300     (void) CloneString(&clone_info->server_name,draw_info->server_name);
 301   if (draw_info->dash_pattern != (double *) NULL)
 302     {
 303       register ssize_t
 304         x;
 305
 306       for (x=0; draw_info->dash_pattern[x] != 0.0; x++) ;
 307       clone_info->dash_pattern=(double *) AcquireQuantumMemory((size_t) x+1UL,
 308         sizeof(*clone_info->dash_pattern));
 309       if (clone_info->dash_pattern == (double *) NULL)
 310         ThrowFatalException(ResourceLimitFatalError,
 311           "UnableToAllocateDashPattern");
 312       (void) CopyMagickMemory(clone_info->dash_pattern,draw_info->dash_pattern,
 313         (size_t) (x+1)*sizeof(*clone_info->dash_pattern));
 314     }
 315   clone_info->gradient=draw_info->gradient;
 316   if (draw_info->gradient.stops != (StopInfo *) NULL)
 317     {
 318       size_t
 319         number_stops;
 320
 321       number_stops=clone_info->gradient.number_stops;
 322       clone_info->gradient.stops=(StopInfo *) AcquireQuantumMemory((size_t)
 323         number_stops,sizeof(*clone_info->gradient.stops));
 324       if (clone_info->gradient.stops == (StopInfo *) NULL)
 325         ThrowFatalException(ResourceLimitFatalError,
 326           "UnableToAllocateDashPattern");
 327       (void) CopyMagickMemory(clone_info->gradient.stops,
 328         draw_info->gradient.stops,(size_t) number_stops*
 329         sizeof(*clone_info->gradient.stops));
 330     }
 331   if (draw_info->clip_mask != (char *) NULL)
 332     (void) CloneString(&clone_info->clip_mask,draw_info->clip_mask);
 333   clone_info->bounds=draw_info->bounds;
 334   clone_info->clip_units=draw_info->clip_units;
 335   clone_info->render=draw_info->render;
 336   clone_info->opacity=draw_info->opacity;
 337   clone_info->element_reference=draw_info->element_reference;
 338   clone_info->debug=IsEventLogging();
 339   return(clone_info);
 340 }
 341 \f
 342 /*
 343 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 344 %                                                                             %
 345 %                                                                             %
 346 %                                                                             %
 347 +   C o n v e r t P a t h T o P o l y g o n                                   %
 348 %                                                                             %
 349 %                                                                             %
 350 %                                                                             %
 351 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 352 %
 353 %  ConvertPathToPolygon() converts a path to the more efficient sorted
 354 %  rendering form.
 355 %
 356 %  The format of the ConvertPathToPolygon method is:
 357 %
 358 %      PolygonInfo *ConvertPathToPolygon(const DrawInfo *draw_info,
 359 %        const PathInfo *path_info)
 360 %
 361 %  A description of each parameter follows:
 362 %
 363 %    o Method ConvertPathToPolygon returns the path in a more efficient sorted
 364 %      rendering form of type PolygonInfo.
 365 %
 366 %    o draw_info: Specifies a pointer to an DrawInfo structure.
 367 %
 368 %    o path_info: Specifies a pointer to an PathInfo structure.
 369 %
 370 %
 371 */
 372
 373 #if defined(__cplusplus) || defined(c_plusplus)
 374 extern "C" {
 375 #endif
 376
 377 static int CompareEdges(const void *x,const void *y)
 378 {
 379   register const EdgeInfo
 380     *p,
 381     *q;
 382
 383   /*
 384     Compare two edges.
 385   */
 386   p=(const EdgeInfo *) x;
 387   q=(const EdgeInfo *) y;
 388   if ((p->points[0].y-MagickEpsilon) > q->points[0].y)
 389     return(1);
 390   if ((p->points[0].y+MagickEpsilon) < q->points[0].y)
 391     return(-1);
 392   if ((p->points[0].x-MagickEpsilon) > q->points[0].x)
 393     return(1);
 394   if ((p->points[0].x+MagickEpsilon) < q->points[0].x)
 395     return(-1);
 396   if (((p->points[1].x-p->points[0].x)*(q->points[1].y-q->points[0].y)-
 397        (p->points[1].y-p->points[0].y)*(q->points[1].x-q->points[0].x)) > 0.0)
 398     return(1);
 399   return(-1);
 400 }
 401
 402 #if defined(__cplusplus) || defined(c_plusplus)
 403 }
 404 #endif
 405
 406 static void LogPolygonInfo(const PolygonInfo *polygon_info)
 407 {
 408   register EdgeInfo
 409     *p;
 410
 411   register ssize_t
 412     i,
 413     j;
 414
 415   (void) LogMagickEvent(DrawEvent,GetMagickModule(),"    begin active-edge");
 416   p=polygon_info->edges;
 417   for (i=0; i < (ssize_t) polygon_info->number_edges; i++)
 418   {
 419     (void) LogMagickEvent(DrawEvent,GetMagickModule(),"      edge %.20g:",
 420       (double) i);
 421     (void) LogMagickEvent(DrawEvent,GetMagickModule(),"      direction: %s",
 422       p->direction != MagickFalse ? "down" : "up");
 423     (void) LogMagickEvent(DrawEvent,GetMagickModule(),"      ghostline: %s",
 424       p->ghostline != MagickFalse ? "transparent" : "opaque");
 425     (void) LogMagickEvent(DrawEvent,GetMagickModule(),
 426       "      bounds: %g,%g - %g,%g",p->bounds.x1,p->bounds.y1,
 427       p->bounds.x2,p->bounds.y2);
 428     for (j=0; j < (ssize_t) p->number_points; j++)
 429       (void) LogMagickEvent(DrawEvent,GetMagickModule(),"        %g,%g",
 430         p->points[j].x,p->points[j].y);
 431     p++;
 432   }
 433   (void) LogMagickEvent(DrawEvent,GetMagickModule(),"    end active-edge");
 434 }
 435
 436 static void ReversePoints(PointInfo *points,const size_t number_points)
 437 {
 438   PointInfo
 439     point;
 440
 441   register ssize_t
 442     i;
 443
 444   for (i=0; i < (ssize_t) (number_points >> 1); i++)
 445   {
 446     point=points[i];
 447     points[i]=points[number_points-(i+1)];
 448     points[number_points-(i+1)]=point;
 449   }
 450 }
 451
 452 static PolygonInfo *ConvertPathToPolygon(
 453   const DrawInfo *magick_unused(draw_info),const PathInfo *path_info)
 454 {
 455   long
 456     direction,
 457     next_direction;
 458
 459   PointInfo
 460     point,
 461     *points;
 462
 463   PolygonInfo
 464     *polygon_info;
 465
 466   SegmentInfo
 467     bounds;
 468
 469   register ssize_t
 470     i,
 471     n;
 472
 473   MagickBooleanType
 474     ghostline;
 475
 476   size_t
 477     edge,
 478     number_edges,
 479     number_points;
 480
 481   /*
 482     Convert a path to the more efficient sorted rendering form.
 483   */
 484   polygon_info=(PolygonInfo *) AcquireAlignedMemory(1,sizeof(*polygon_info));
 485   if (polygon_info == (PolygonInfo *) NULL)
 486     return((PolygonInfo *) NULL);
 487   number_edges=16;
 488   polygon_info->edges=(EdgeInfo *) AcquireQuantumMemory((size_t) number_edges,
 489     sizeof(*polygon_info->edges));
 490   if (polygon_info->edges == (EdgeInfo *) NULL)
 491     return((PolygonInfo *) NULL);
 492   direction=0;
 493   edge=0;
 494   ghostline=MagickFalse;
 495   n=0;
 496   number_points=0;
 497   points=(PointInfo *) NULL;
 498   (void) ResetMagickMemory(&point,0,sizeof(point));
 499   (void) ResetMagickMemory(&bounds,0,sizeof(bounds));
 500   for (i=0; path_info[i].code != EndCode; i++)
 501   {
 502     if ((path_info[i].code == MoveToCode) || (path_info[i].code == OpenCode) ||
 503         (path_info[i].code == GhostlineCode))
 504       {
 505         /*
 506           Move to.
 507         */
 508         if ((points != (PointInfo *) NULL) && (n >= 2))
 509           {
 510             if (edge == number_edges)
 511               {
 512                 number_edges<<=1;
 513                 polygon_info->edges=(EdgeInfo *) ResizeQuantumMemory(
 514                   polygon_info->edges,(size_t) number_edges,
 515                   sizeof(*polygon_info->edges));
 516                 if (polygon_info->edges == (EdgeInfo *) NULL)
 517                   return((PolygonInfo *) NULL);
 518               }
 519             polygon_info->edges[edge].number_points=(size_t) n;
 520             polygon_info->edges[edge].scanline=(-1.0);
 521             polygon_info->edges[edge].highwater=0;
 522             polygon_info->edges[edge].ghostline=ghostline;
 523             polygon_info->edges[edge].direction=(ssize_t) (direction > 0);
 524             if (direction < 0)
 525               ReversePoints(points,(size_t) n);
 526             polygon_info->edges[edge].points=points;
 527             polygon_info->edges[edge].bounds=bounds;
 528             polygon_info->edges[edge].bounds.y1=points[0].y;
 529             polygon_info->edges[edge].bounds.y2=points[n-1].y;
 530             points=(PointInfo *) NULL;
 531             ghostline=MagickFalse;
 532             edge++;
 533           }
 534         if (points == (PointInfo *) NULL)
 535           {
 536             number_points=16;
 537             points=(PointInfo *) AcquireQuantumMemory((size_t) number_points,
 538               sizeof(*points));
 539             if (points == (PointInfo *) NULL)
 540               return((PolygonInfo *) NULL);
 541           }
 542         ghostline=path_info[i].code == GhostlineCode ? MagickTrue : MagickFalse;
 543         point=path_info[i].point;
 544         points[0]=point;
 545         bounds.x1=point.x;
 546         bounds.x2=point.x;
 547         direction=0;
 548         n=1;
 549         continue;
 550       }
 551     /*
 552       Line to.
 553     */
 554     next_direction=((path_info[i].point.y > point.y) ||
 555       ((path_info[i].point.y == point.y) &&
 556        (path_info[i].point.x > point.x))) ? 1 : -1;
 557     if ((direction != 0) && (direction != next_direction))
 558       {
 559         /*
 560           New edge.
 561         */
 562         point=points[n-1];
 563         if (edge == number_edges)
 564           {
 565             number_edges<<=1;
 566             polygon_info->edges=(EdgeInfo *) ResizeQuantumMemory(
 567               polygon_info->edges,(size_t) number_edges,
 568               sizeof(*polygon_info->edges));
 569             if (polygon_info->edges == (EdgeInfo *) NULL)
 570               return((PolygonInfo *) NULL);
 571           }
 572         polygon_info->edges[edge].number_points=(size_t) n;
 573         polygon_info->edges[edge].scanline=(-1.0);
 574         polygon_info->edges[edge].highwater=0;
 575         polygon_info->edges[edge].ghostline=ghostline;
 576         polygon_info->edges[edge].direction=(ssize_t) (direction > 0);
 577         if (direction < 0)
 578           ReversePoints(points,(size_t) n);
 579         polygon_info->edges[edge].points=points;
 580         polygon_info->edges[edge].bounds=bounds;
 581         polygon_info->edges[edge].bounds.y1=points[0].y;
 582         polygon_info->edges[edge].bounds.y2=points[n-1].y;
 583         number_points=16;
 584         points=(PointInfo *) AcquireQuantumMemory((size_t) number_points,
 585           sizeof(*points));
 586         if (points == (PointInfo *) NULL)
 587           return((PolygonInfo *) NULL);
 588         n=1;
 589         ghostline=MagickFalse;
 590         points[0]=point;
 591         bounds.x1=point.x;
 592         bounds.x2=point.x;
 593         edge++;
 594       }
 595     direction=next_direction;
 596     if (points == (PointInfo *) NULL)
 597       continue;
 598     if (n == (ssize_t) number_points)
 599       {
 600         number_points<<=1;
 601         points=(PointInfo *) ResizeQuantumMemory(points,(size_t) number_points,
 602           sizeof(*points));
 603         if (points == (PointInfo *) NULL)
 604           return((PolygonInfo *) NULL);
 605       }
 606     point=path_info[i].point;
 607     points[n]=point;
 608     if (point.x < bounds.x1)
 609       bounds.x1=point.x;
 610     if (point.x > bounds.x2)
 611       bounds.x2=point.x;
 612     n++;
 613   }
 614   if (points != (PointInfo *) NULL)
 615     {
 616       if (n < 2)
 617         points=(PointInfo *) RelinquishMagickMemory(points);
 618       else
 619         {
 620           if (edge == number_edges)
 621             {
 622               number_edges<<=1;
 623               polygon_info->edges=(EdgeInfo *) ResizeQuantumMemory(
 624                 polygon_info->edges,(size_t) number_edges,
 625                 sizeof(*polygon_info->edges));
 626               if (polygon_info->edges == (EdgeInfo *) NULL)
 627                 return((PolygonInfo *) NULL);
 628             }
 629           polygon_info->edges[edge].number_points=(size_t) n;
 630           polygon_info->edges[edge].scanline=(-1.0);
 631           polygon_info->edges[edge].highwater=0;
 632           polygon_info->edges[edge].ghostline=ghostline;
 633           polygon_info->edges[edge].direction=(ssize_t) (direction > 0);
 634           if (direction < 0)
 635             ReversePoints(points,(size_t) n);
 636           polygon_info->edges[edge].points=points;
 637           polygon_info->edges[edge].bounds=bounds;
 638           polygon_info->edges[edge].bounds.y1=points[0].y;
 639           polygon_info->edges[edge].bounds.y2=points[n-1].y;
 640           ghostline=MagickFalse;
 641           edge++;
 642         }
 643     }
 644   polygon_info->number_edges=edge;
 645   qsort(polygon_info->edges,(size_t) polygon_info->number_edges,
 646     sizeof(*polygon_info->edges),CompareEdges);
 647   if (IsEventLogging() != MagickFalse)
 648     LogPolygonInfo(polygon_info);
 649   return(polygon_info);
 650 }
 651 \f
 652 /*
 653 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 654 %                                                                             %
 655 %                                                                             %
 656 %                                                                             %
 657 +   C o n v e r t P r i m i t i v e T o P a t h                               %
 658 %                                                                             %
 659 %                                                                             %
 660 %                                                                             %
 661 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 662 %
 663 %  ConvertPrimitiveToPath() converts a PrimitiveInfo structure into a vector
 664 %  path structure.
 665 %
 666 %  The format of the ConvertPrimitiveToPath method is:
 667 %
 668 %      PathInfo *ConvertPrimitiveToPath(const DrawInfo *draw_info,
 669 %        const PrimitiveInfo *primitive_info)
 670 %
 671 %  A description of each parameter follows:
 672 %
 673 %    o Method ConvertPrimitiveToPath returns a vector path structure of type
 674 %      PathInfo.
 675 %
 676 %    o draw_info: a structure of type DrawInfo.
 677 %
 678 %    o primitive_info: Specifies a pointer to an PrimitiveInfo structure.
 679 %
 680 %
 681 */
 682
 683 static void LogPathInfo(const PathInfo *path_info)
 684 {
 685   register const PathInfo
 686     *p;
 687
 688   (void) LogMagickEvent(DrawEvent,GetMagickModule(),"    begin vector-path");
 689   for (p=path_info; p->code != EndCode; p++)
 690     (void) LogMagickEvent(DrawEvent,GetMagickModule(),
 691       "      %g,%g %s",p->point.x,p->point.y,p->code == GhostlineCode ?
 692       "moveto ghostline" : p->code == OpenCode ? "moveto open" :
 693       p->code == MoveToCode ? "moveto" : p->code == LineToCode ? "lineto" :
 694       "?");
 695   (void) LogMagickEvent(DrawEvent,GetMagickModule(),"    end vector-path");
 696 }
 697
 698 static PathInfo *ConvertPrimitiveToPath(
 699   const DrawInfo *magick_unused(draw_info),const PrimitiveInfo *primitive_info)
 700 {
 701   ssize_t
 702     coordinates,
 703     start;
 704
 705   PathInfo
 706     *path_info;
 707
 708   PathInfoCode
 709     code;
 710
 711   PointInfo
 712     p,
 713     q;
 714
 715   register ssize_t
 716     i,
 717     n;
 718
 719   /*
 720     Converts a PrimitiveInfo structure into a vector path structure.
 721   */
 722   switch (primitive_info->primitive)
 723   {
 724     case PointPrimitive:
 725     case ColorPrimitive:
 726     case MattePrimitive:
 727     case TextPrimitive:
 728     case ImagePrimitive:
 729       return((PathInfo *) NULL);
 730     default:
 731       break;
 732   }
 733   for (i=0; primitive_info[i].primitive != UndefinedPrimitive; i++) ;
 734   path_info=(PathInfo *) AcquireQuantumMemory((size_t) (2UL*i+3UL),
 735     sizeof(*path_info));
 736   if (path_info == (PathInfo *) NULL)
 737     return((PathInfo *) NULL);
 738   coordinates=0;
 739   n=0;
 740   p.x=(-1.0);
 741   p.y=(-1.0);
 742   q.x=(-1.0);
 743   q.y=(-1.0);
 744   start=0;
 745   for (i=0; primitive_info[i].primitive != UndefinedPrimitive; i++)
 746   {
 747     code=LineToCode;
 748     if (coordinates <= 0)
 749       {
 750         coordinates=(ssize_t) primitive_info[i].coordinates;
 751         p=primitive_info[i].point;
 752         start=n;
 753         code=MoveToCode;
 754       }
 755     coordinates--;
 756     /*
 757       Eliminate duplicate points.
 758     */
 759     if ((i == 0) || (fabs(q.x-primitive_info[i].point.x) > MagickEpsilon) ||
 760         (fabs(q.y-primitive_info[i].point.y) > MagickEpsilon))
 761       {
 762         path_info[n].code=code;
 763         path_info[n].point=primitive_info[i].point;
 764         q=primitive_info[i].point;
 765         n++;
 766       }
 767     if (coordinates > 0)
 768       continue;
 769     if ((fabs(p.x-primitive_info[i].point.x) <= MagickEpsilon) &&
 770         (fabs(p.y-primitive_info[i].point.y) <= MagickEpsilon))
 771       continue;
 772     /*
 773       Mark the p point as open if it does not match the q.
 774     */
 775     path_info[start].code=OpenCode;
 776     path_info[n].code=GhostlineCode;
 777     path_info[n].point=primitive_info[i].point;
 778     n++;
 779     path_info[n].code=LineToCode;
 780     path_info[n].point=p;
 781     n++;
 782   }
 783   path_info[n].code=EndCode;
 784   path_info[n].point.x=0.0;
 785   path_info[n].point.y=0.0;
 786   if (IsEventLogging() != MagickFalse)
 787     LogPathInfo(path_info);
 788   return(path_info);
 789 }
 790 \f
 791 /*
 792 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 793 %                                                                             %
 794 %                                                                             %
 795 %                                                                             %
 796 %   D e s t r o y D r a w I n f o                                             %
 797 %                                                                             %
 798 %                                                                             %
 799 %                                                                             %
 800 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 801 %
 802 %  DestroyDrawInfo() deallocates memory associated with an DrawInfo
 803 %  structure.
 804 %
 805 %  The format of the DestroyDrawInfo method is:
 806 %
 807 %      DrawInfo *DestroyDrawInfo(DrawInfo *draw_info)
 808 %
 809 %  A description of each parameter follows:
 810 %
 811 %    o draw_info: the draw info.
 812 %
 813 */
 814 MagickExport DrawInfo *DestroyDrawInfo(DrawInfo *draw_info)
 815 {
 816   if (draw_info->debug != MagickFalse)
 817     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 818   assert(draw_info != (DrawInfo *) NULL);
 819   assert(draw_info->signature == MagickSignature);
 820   if (draw_info->primitive != (char *) NULL)
 821     draw_info->primitive=DestroyString(draw_info->primitive);
 822   if (draw_info->text != (char *) NULL)
 823     draw_info->text=DestroyString(draw_info->text);
 824   if (draw_info->geometry != (char *) NULL)
 825     draw_info->geometry=DestroyString(draw_info->geometry);
 826   if (draw_info->tile != (Image *) NULL)
 827     draw_info->tile=DestroyImage(draw_info->tile);
 828   if (draw_info->fill_pattern != (Image *) NULL)
 829     draw_info->fill_pattern=DestroyImage(draw_info->fill_pattern);
 830   if (draw_info->stroke_pattern != (Image *) NULL)
 831     draw_info->stroke_pattern=DestroyImage(draw_info->stroke_pattern);
 832   if (draw_info->font != (char *) NULL)
 833     draw_info->font=DestroyString(draw_info->font);
 834   if (draw_info->metrics != (char *) NULL)
 835     draw_info->metrics=DestroyString(draw_info->metrics);
 836   if (draw_info->family != (char *) NULL)
 837     draw_info->family=DestroyString(draw_info->family);
 838   if (draw_info->encoding != (char *) NULL)
 839     draw_info->encoding=DestroyString(draw_info->encoding);
 840   if (draw_info->density != (char *) NULL)
 841     draw_info->density=DestroyString(draw_info->density);
 842   if (draw_info->server_name != (char *) NULL)
 843     draw_info->server_name=(char *)
 844      RelinquishMagickMemory(draw_info->server_name);
 845   if (draw_info->dash_pattern != (double *) NULL)
 846     draw_info->dash_pattern=(double *) RelinquishMagickMemory(
 847       draw_info->dash_pattern);
 848   if (draw_info->gradient.stops != (StopInfo *) NULL)
 849     draw_info->gradient.stops=(StopInfo *) RelinquishMagickMemory(
 850       draw_info->gradient.stops);
 851   if (draw_info->clip_mask != (char *) NULL)
 852     draw_info->clip_mask=DestroyString(draw_info->clip_mask);
 853   draw_info->signature=(~MagickSignature);
 854   draw_info=(DrawInfo *) RelinquishMagickMemory(draw_info);
 855   return(draw_info);
 856 }
 857 \f
 858 /*
 859 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 860 %                                                                             %
 861 %                                                                             %
 862 %                                                                             %
 863 +   D e s t r o y E d g e                                                     %
 864 %                                                                             %
 865 %                                                                             %
 866 %                                                                             %
 867 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 868 %
 869 %  DestroyEdge() destroys the specified polygon edge.
 870 %
 871 %  The format of the DestroyEdge method is:
 872 %
 873 %      ssize_t DestroyEdge(PolygonInfo *polygon_info,const int edge)
 874 %
 875 %  A description of each parameter follows:
 876 %
 877 %    o polygon_info: Specifies a pointer to an PolygonInfo structure.
 878 %
 879 %    o edge: the polygon edge number to destroy.
 880 %
 881 */
 882 static size_t DestroyEdge(PolygonInfo *polygon_info,
 883   const size_t edge)
 884 {
 885   assert(edge < polygon_info->number_edges);
 886   polygon_info->edges[edge].points=(PointInfo *) RelinquishMagickMemory(
 887     polygon_info->edges[edge].points);
 888   polygon_info->number_edges--;
 889   if (edge < polygon_info->number_edges)
 890     (void) CopyMagickMemory(polygon_info->edges+edge,polygon_info->edges+edge+1,
 891       (size_t) (polygon_info->number_edges-edge)*sizeof(*polygon_info->edges));
 892   return(polygon_info->number_edges);
 893 }
 894 \f
 895 /*
 896 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 897 %                                                                             %
 898 %                                                                             %
 899 %                                                                             %
 900 +   D e s t r o y P o l y g o n I n f o                                       %
 901 %                                                                             %
 902 %                                                                             %
 903 %                                                                             %
 904 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 905 %
 906 %  DestroyPolygonInfo() destroys the PolygonInfo data structure.
 907 %
 908 %  The format of the DestroyPolygonInfo method is:
 909 %
 910 %      PolygonInfo *DestroyPolygonInfo(PolygonInfo *polygon_info)
 911 %
 912 %  A description of each parameter follows:
 913 %
 914 %    o polygon_info: Specifies a pointer to an PolygonInfo structure.
 915 %
 916 */
 917 static PolygonInfo *DestroyPolygonInfo(PolygonInfo *polygon_info)
 918 {
 919   register ssize_t
 920     i;
 921
 922   for (i=0; i < (ssize_t) polygon_info->number_edges; i++)
 923     polygon_info->edges[i].points=(PointInfo *)
 924       RelinquishMagickMemory(polygon_info->edges[i].points);
 925   polygon_info->edges=(EdgeInfo *) RelinquishMagickMemory(polygon_info->edges);
 926   return((PolygonInfo *) RelinquishMagickMemory(polygon_info));
 927 }
 928 \f
 929 /*
 930 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 931 %                                                                             %
 932 %                                                                             %
 933 %                                                                             %
 934 %     D r a w A f f i n e I m a g e                                           %
 935 %                                                                             %
 936 %                                                                             %
 937 %                                                                             %
 938 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 939 %
 940 %  DrawAffineImage() composites the source over the destination image as
 941 %  dictated by the affine transform.
 942 %
 943 %  The format of the DrawAffineImage method is:
 944 %
 945 %      MagickBooleanType DrawAffineImage(Image *image,const Image *source,
 946 %        const AffineMatrix *affine)
 947 %
 948 %  A description of each parameter follows:
 949 %
 950 %    o image: the image.
 951 %
 952 %    o source: the source image.
 953 %
 954 %    o affine: the affine transform.
 955 %
 956 */
 957 static SegmentInfo AffineEdge(const Image *image,const AffineMatrix *affine,
 958   const double y,const SegmentInfo *edge)
 959 {
 960   double
 961     intercept,
 962     z;
 963
 964   register double
 965     x;
 966
 967   SegmentInfo
 968     inverse_edge;
 969
 970   /*
 971     Determine left and right edges.
 972   */
 973   inverse_edge.x1=edge->x1;
 974   inverse_edge.y1=edge->y1;
 975   inverse_edge.x2=edge->x2;
 976   inverse_edge.y2=edge->y2;
 977   z=affine->ry*y+affine->tx;
 978   if (affine->sx > MagickEpsilon)
 979     {
 980       intercept=(-z/affine->sx);
 981       x=intercept+MagickEpsilon;
 982       if (x > inverse_edge.x1)
 983         inverse_edge.x1=x;
 984       intercept=(-z+(double) image->columns)/affine->sx;
 985       x=intercept-MagickEpsilon;
 986       if (x < inverse_edge.x2)
 987         inverse_edge.x2=x;
 988     }
 989   else
 990     if (affine->sx < -MagickEpsilon)
 991       {
 992         intercept=(-z+(double) image->columns)/affine->sx;
 993         x=intercept+MagickEpsilon;
 994         if (x > inverse_edge.x1)
 995           inverse_edge.x1=x;
 996         intercept=(-z/affine->sx);
 997         x=intercept-MagickEpsilon;
 998         if (x < inverse_edge.x2)
 999           inverse_edge.x2=x;
1000       }
1001     else
1002       if ((z < 0.0) || ((size_t) floor(z+0.5) >= image->columns))
1003         {
1004           inverse_edge.x2=edge->x1;
1005           return(inverse_edge);
1006         }
1007   /*
1008     Determine top and bottom edges.
1009   */
1010   z=affine->sy*y+affine->ty;
1011   if (affine->rx > MagickEpsilon)
1012     {
1013       intercept=(-z/affine->rx);
1014       x=intercept+MagickEpsilon;
1015       if (x > inverse_edge.x1)
1016         inverse_edge.x1=x;
1017       intercept=(-z+(double) image->rows)/affine->rx;
1018       x=intercept-MagickEpsilon;
1019       if (x < inverse_edge.x2)
1020         inverse_edge.x2=x;
1021     }
1022   else
1023     if (affine->rx < -MagickEpsilon)
1024       {
1025         intercept=(-z+(double) image->rows)/affine->rx;
1026         x=intercept+MagickEpsilon;
1027         if (x > inverse_edge.x1)
1028           inverse_edge.x1=x;
1029         intercept=(-z/affine->rx);
1030         x=intercept-MagickEpsilon;
1031         if (x < inverse_edge.x2)
1032           inverse_edge.x2=x;
1033       }
1034     else
1035       if ((z < 0.0) || ((size_t) floor(z+0.5) >= image->rows))
1036         {
1037           inverse_edge.x2=edge->x2;
1038           return(inverse_edge);
1039         }
1040   return(inverse_edge);
1041 }
1042
1043 static AffineMatrix InverseAffineMatrix(const AffineMatrix *affine)
1044 {
1045   AffineMatrix
1046     inverse_affine;
1047
1048   double
1049     determinant;
1050
1051   determinant=1.0/(affine->sx*affine->sy-affine->rx*affine->ry);
1052   inverse_affine.sx=determinant*affine->sy;
1053   inverse_affine.rx=determinant*(-affine->rx);
1054   inverse_affine.ry=determinant*(-affine->ry);
1055   inverse_affine.sy=determinant*affine->sx;
1056   inverse_affine.tx=(-affine->tx)*inverse_affine.sx-affine->ty*
1057     inverse_affine.ry;
1058   inverse_affine.ty=(-affine->tx)*inverse_affine.rx-affine->ty*
1059     inverse_affine.sy;
1060   return(inverse_affine);
1061 }
1062
1063 static inline ssize_t MagickAbsoluteValue(const ssize_t x)
1064 {
1065   if (x < 0)
1066     return(-x);
1067   return(x);
1068 }
1069
1070 static inline double MagickMax(const double x,const double y)
1071 {
1072   if (x > y)
1073     return(x);
1074   return(y);
1075 }
1076
1077 static inline double MagickMin(const double x,const double y)
1078 {
1079   if (x < y)
1080     return(x);
1081   return(y);
1082 }
1083
1084 MagickExport MagickBooleanType DrawAffineImage(Image *image,
1085   const Image *source,const AffineMatrix *affine)
1086 {
1087   AffineMatrix
1088     inverse_affine;
1089
1090   CacheView
1091     *image_view,
1092     *source_view;
1093
1094   ExceptionInfo
1095     *exception;
1096
1097   ssize_t
1098     y;
1099
1100   MagickBooleanType
1101     status;
1102
1103   MagickPixelPacket
1104     zero;
1105
1106   PointInfo
1107     extent[4],
1108     min,
1109     max,
1110     point;
1111
1112   register ssize_t
1113     i;
1114
1115   ResampleFilter
1116     **restrict resample_filter;
1117
1118   SegmentInfo
1119     edge;
1120
1121   /*
1122     Determine bounding box.
1123   */
1124   assert(image != (Image *) NULL);
1125   assert(image->signature == MagickSignature);
1126   if (image->debug != MagickFalse)
1127     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1128   assert(source != (const Image *) NULL);
1129   assert(source->signature == MagickSignature);
1130   assert(affine != (AffineMatrix *) NULL);
1131   extent[0].x=0.0;
1132   extent[0].y=0.0;
1133   extent[1].x=(double) source->columns-1.0;
1134   extent[1].y=0.0;
1135   extent[2].x=(double) source->columns-1.0;
1136   extent[2].y=(double) source->rows-1.0;
1137   extent[3].x=0.0;
1138   extent[3].y=(double) source->rows-1.0;
1139   for (i=0; i < 4; i++)
1140   {
1141     point=extent[i];
1142     extent[i].x=point.x*affine->sx+point.y*affine->ry+affine->tx;
1143     extent[i].y=point.x*affine->rx+point.y*affine->sy+affine->ty;
1144   }
1145   min=extent[0];
1146   max=extent[0];
1147   for (i=1; i < 4; i++)
1148   {
1149     if (min.x > extent[i].x)
1150       min.x=extent[i].x;
1151     if (min.y > extent[i].y)
1152       min.y=extent[i].y;
1153     if (max.x < extent[i].x)
1154       max.x=extent[i].x;
1155     if (max.y < extent[i].y)
1156       max.y=extent[i].y;
1157   }
1158   /*
1159     Affine transform image.
1160   */
1161   if (SetImageStorageClass(image,DirectClass) == MagickFalse)
1162     return(MagickFalse);
1163   status=MagickTrue;
1164   edge.x1=MagickMax(min.x,0.0);
1165   edge.y1=MagickMax(min.y,0.0);
1166   edge.x2=MagickMin(max.x,(double) image->columns-1.0);
1167   edge.y2=MagickMin(max.y,(double) image->rows-1.0);
1168   inverse_affine=InverseAffineMatrix(affine);
1169   GetMagickPixelPacket(image,&zero);
1170   exception=(&image->exception);
1171   resample_filter=AcquireResampleFilterThreadSet(source,
1172     UndefinedVirtualPixelMethod,MagickTrue,exception);
1173   image_view=AcquireCacheView(image);
1174   source_view=AcquireCacheView(source);
1175 #if defined(MAGICKCORE_OPENMP_SUPPORT)
1176   #pragma omp parallel for schedule(dynamic,4) shared(status)
1177 #endif
1178   for (y=(ssize_t) ceil(edge.y1-0.5); y <= (ssize_t) floor(edge.y2+0.5); y++)
1179   {
1180     ssize_t
1181       x_offset;
1182
1183     MagickPixelPacket
1184       composite,
1185       pixel;
1186
1187     PointInfo
1188       point;
1189
1190     register IndexPacket
1191       *restrict indexes;
1192
1193     register ssize_t
1194       id,
1195       x;
1196
1197     register PixelPacket
1198       *restrict q;
1199
1200     SegmentInfo
1201       inverse_edge;
1202
1203     inverse_edge=AffineEdge(source,&inverse_affine,(double) y,&edge);
1204     if (inverse_edge.x2 < inverse_edge.x1)
1205       continue;
1206     q=GetCacheViewAuthenticPixels(image_view,(ssize_t) ceil(inverse_edge.x1-0.5),y,
1207       (size_t) ((ssize_t) floor(inverse_edge.x2+0.5)-(ssize_t) floor(
1208       inverse_edge.x1+0.5)+1),1,exception);
1209     if (q == (PixelPacket *) NULL)
1210       continue;
1211     id=GetOpenMPThreadId();
1212     indexes=GetCacheViewAuthenticIndexQueue(image_view);
1213     pixel=zero;
1214     composite=zero;
1215     x_offset=0;
1216     for (x=(ssize_t) ceil(inverse_edge.x1-0.5); x <= (ssize_t) floor(inverse_edge.x2+0.5); x++)
1217     {
1218       point.x=(double) x*inverse_affine.sx+y*inverse_affine.ry+
1219         inverse_affine.tx;
1220       point.y=(double) x*inverse_affine.rx+y*inverse_affine.sy+
1221         inverse_affine.ty;
1222       (void) ResamplePixelColor(resample_filter[id],point.x,point.y,&pixel);
1223       SetMagickPixelPacket(image,q,indexes+x_offset,&composite);
1224       MagickPixelCompositeOver(&pixel,pixel.opacity,&composite,
1225         composite.opacity,&composite);
1226       SetPixelPacket(image,&composite,q,indexes+x_offset);
1227       x_offset++;
1228       q++;
1229     }
1230     if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
1231       status=MagickFalse;
1232   }
1233   resample_filter=DestroyResampleFilterThreadSet(resample_filter);
1234   source_view=DestroyCacheView(source_view);
1235   image_view=DestroyCacheView(image_view);
1236   return(status);
1237 }
1238 \f
1239 /*
1240 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1241 %                                                                             %
1242 %                                                                             %
1243 %                                                                             %
1244 +   D r a w B o u n d i n g R e c t a n g l e s                               %
1245 %                                                                             %
1246 %                                                                             %
1247 %                                                                             %
1248 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1249 %
1250 %  DrawBoundingRectangles() draws the bounding rectangles on the image.  This
1251 %  is only useful for developers debugging the rendering algorithm.
1252 %
1253 %  The format of the DrawBoundingRectangles method is:
1254 %
1255 %      void DrawBoundingRectangles(Image *image,const DrawInfo *draw_info,
1256 %        PolygonInfo *polygon_info)
1257 %
1258 %  A description of each parameter follows:
1259 %
1260 %    o image: the image.
1261 %
1262 %    o draw_info: the draw info.
1263 %
1264 %    o polygon_info: Specifies a pointer to a PolygonInfo structure.
1265 %
1266 */
1267 static void DrawBoundingRectangles(Image *image,const DrawInfo *draw_info,
1268   const PolygonInfo *polygon_info)
1269 {
1270   DrawInfo
1271     *clone_info;
1272
1273   ssize_t
1274     coordinates;
1275
1276   MagickRealType
1277     mid;
1278
1279   PointInfo
1280     end,
1281     resolution,
1282     start;
1283
1284   PrimitiveInfo
1285     primitive_info[6];
1286
1287   register ssize_t
1288     i;
1289
1290   SegmentInfo
1291     bounds;
1292
1293   clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
1294   (void) QueryColorDatabase("#0000",&clone_info->fill,&image->exception);
1295   resolution.x=DefaultResolution;
1296   resolution.y=DefaultResolution;
1297   if (clone_info->density != (char *) NULL)
1298     {
1299       GeometryInfo
1300         geometry_info;
1301
1302       MagickStatusType
1303         flags;
1304
1305       flags=ParseGeometry(clone_info->density,&geometry_info);
1306       resolution.x=geometry_info.rho;
1307       resolution.y=geometry_info.sigma;
1308       if ((flags & SigmaValue) == MagickFalse)
1309         resolution.y=resolution.x;
1310     }
1311   mid=(resolution.x/72.0)*ExpandAffine(&clone_info->affine)*
1312     clone_info->stroke_width/2.0;
1313   bounds.x1=0.0;
1314   bounds.y1=0.0;
1315   bounds.x2=0.0;
1316   bounds.y2=0.0;
1317   if (polygon_info != (PolygonInfo *) NULL)
1318     {
1319       bounds=polygon_info->edges[0].bounds;
1320       for (i=1; i < (ssize_t) polygon_info->number_edges; i++)
1321       {
1322         if (polygon_info->edges[i].bounds.x1 < (double) bounds.x1)
1323           bounds.x1=polygon_info->edges[i].bounds.x1;
1324         if (polygon_info->edges[i].bounds.y1 < (double) bounds.y1)
1325           bounds.y1=polygon_info->edges[i].bounds.y1;
1326         if (polygon_info->edges[i].bounds.x2 > (double) bounds.x2)
1327           bounds.x2=polygon_info->edges[i].bounds.x2;
1328         if (polygon_info->edges[i].bounds.y2 > (double) bounds.y2)
1329           bounds.y2=polygon_info->edges[i].bounds.y2;
1330       }
1331       bounds.x1-=mid;
1332       bounds.x1=bounds.x1 < 0.0 ? 0.0 : bounds.x1 >= (double)
1333         image->columns ? (double) image->columns-1 : bounds.x1;
1334       bounds.y1-=mid;
1335       bounds.y1=bounds.y1 < 0.0 ? 0.0 : bounds.y1 >= (double)
1336         image->rows ? (double) image->rows-1 : bounds.y1;
1337       bounds.x2+=mid;
1338       bounds.x2=bounds.x2 < 0.0 ? 0.0 : bounds.x2 >= (double)
1339         image->columns ? (double) image->columns-1 : bounds.x2;
1340       bounds.y2+=mid;
1341       bounds.y2=bounds.y2 < 0.0 ? 0.0 : bounds.y2 >= (double)
1342         image->rows ? (double) image->rows-1 : bounds.y2;
1343       for (i=0; i < (ssize_t) polygon_info->number_edges; i++)
1344       {
1345         if (polygon_info->edges[i].direction != 0)
1346           (void) QueryColorDatabase("red",&clone_info->stroke,
1347             &image->exception);
1348         else
1349           (void) QueryColorDatabase("green",&clone_info->stroke,
1350             &image->exception);
1351         start.x=(double) (polygon_info->edges[i].bounds.x1-mid);
1352         start.y=(double) (polygon_info->edges[i].bounds.y1-mid);
1353         end.x=(double) (polygon_info->edges[i].bounds.x2+mid);
1354         end.y=(double) (polygon_info->edges[i].bounds.y2+mid);
1355         primitive_info[0].primitive=RectanglePrimitive;
1356         TraceRectangle(primitive_info,start,end);
1357         primitive_info[0].method=ReplaceMethod;
1358         coordinates=(ssize_t) primitive_info[0].coordinates;
1359         primitive_info[coordinates].primitive=UndefinedPrimitive;
1360         (void) DrawPrimitive(image,clone_info,primitive_info);
1361       }
1362     }
1363   (void) QueryColorDatabase("blue",&clone_info->stroke,&image->exception);
1364   start.x=(double) (bounds.x1-mid);
1365   start.y=(double) (bounds.y1-mid);
1366   end.x=(double) (bounds.x2+mid);
1367   end.y=(double) (bounds.y2+mid);
1368   primitive_info[0].primitive=RectanglePrimitive;
1369   TraceRectangle(primitive_info,start,end);
1370   primitive_info[0].method=ReplaceMethod;
1371   coordinates=(ssize_t) primitive_info[0].coordinates;
1372   primitive_info[coordinates].primitive=UndefinedPrimitive;
1373   (void) DrawPrimitive(image,clone_info,primitive_info);
1374   clone_info=DestroyDrawInfo(clone_info);
1375 }
1376 \f
1377 /*
1378 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1379 %                                                                             %
1380 %                                                                             %
1381 %                                                                             %
1382 %   D r a w C l i p P a t h                                                   %
1383 %                                                                             %
1384 %                                                                             %
1385 %                                                                             %
1386 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1387 %
1388 %  DrawClipPath() draws the clip path on the image mask.
1389 %
1390 %  The format of the DrawClipPath method is:
1391 %
1392 %      MagickBooleanType DrawClipPath(Image *image,const DrawInfo *draw_info,
1393 %        const char *name)
1394 %
1395 %  A description of each parameter follows:
1396 %
1397 %    o image: the image.
1398 %
1399 %    o draw_info: the draw info.
1400 %
1401 %    o name: the name of the clip path.
1402 %
1403 */
1404 MagickExport MagickBooleanType DrawClipPath(Image *image,
1405   const DrawInfo *draw_info,const char *name)
1406 {
1407   char
1408     clip_mask[MaxTextExtent];
1409
1410   const char
1411     *value;
1412
1413   DrawInfo
1414     *clone_info;
1415
1416   MagickStatusType
1417     status;
1418
1419   assert(image != (Image *) NULL);
1420   assert(image->signature == MagickSignature);
1421   if (image->debug != MagickFalse)
1422     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1423   assert(draw_info != (const DrawInfo *) NULL);
1424   (void) FormatMagickString(clip_mask,MaxTextExtent,"%s",name);
1425   value=GetImageArtifact(image,clip_mask);
1426   if (value == (const char *) NULL)
1427     return(MagickFalse);
1428   if (image->clip_mask == (Image *) NULL)
1429     {
1430       Image
1431         *clip_mask;
1432
1433       clip_mask=CloneImage(image,image->columns,image->rows,MagickTrue,
1434         &image->exception);
1435       if (clip_mask == (Image *) NULL)
1436         return(MagickFalse);
1437       (void) SetImageClipMask(image,clip_mask);
1438       clip_mask=DestroyImage(clip_mask);
1439     }
1440   (void) QueryColorDatabase("#00000000",&image->clip_mask->background_color,
1441     &image->exception);
1442   image->clip_mask->background_color.opacity=(Quantum) TransparentOpacity;
1443   (void) SetImageBackgroundColor(image->clip_mask);
1444   if (image->debug != MagickFalse)
1445     (void) LogMagickEvent(DrawEvent,GetMagickModule(),"\nbegin clip-path %s",
1446       draw_info->clip_mask);
1447   clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
1448   (void) CloneString(&clone_info->primitive,value);
1449   (void) QueryColorDatabase("#ffffff",&clone_info->fill,&image->exception);
1450   clone_info->clip_mask=(char *) NULL;
1451   status=DrawImage(image->clip_mask,clone_info);
1452   status|=NegateImage(image->clip_mask,MagickFalse);
1453   clone_info=DestroyDrawInfo(clone_info);
1454   if (image->debug != MagickFalse)
1455     (void) LogMagickEvent(DrawEvent,GetMagickModule(),"end clip-path");
1456   return(status != 0 ? MagickTrue : MagickFalse);
1457 }
1458 \f
1459 /*
1460 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1461 %                                                                             %
1462 %                                                                             %
1463 %                                                                             %
1464 +   D r a w D a s h P o l y g o n                                             %
1465 %                                                                             %
1466 %                                                                             %
1467 %                                                                             %
1468 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1469 %
1470 %  DrawDashPolygon() draws a dashed polygon (line, rectangle, ellipse) on the
1471 %  image while respecting the dash offset and dash pattern attributes.
1472 %
1473 %  The format of the DrawDashPolygon method is:
1474 %
1475 %      MagickBooleanType DrawDashPolygon(const DrawInfo *draw_info,
1476 %        const PrimitiveInfo *primitive_info,Image *image)
1477 %
1478 %  A description of each parameter follows:
1479 %
1480 %    o draw_info: the draw info.
1481 %
1482 %    o primitive_info: Specifies a pointer to a PrimitiveInfo structure.
1483 %
1484 %    o image: the image.
1485 %
1486 %
1487 */
1488 static MagickBooleanType DrawDashPolygon(const DrawInfo *draw_info,
1489   const PrimitiveInfo *primitive_info,Image *image)
1490 {
1491   DrawInfo
1492     *clone_info;
1493
1494   ssize_t
1495     j,
1496     n;
1497
1498   MagickRealType
1499     length,
1500     maximum_length,
1501     offset,
1502     scale,
1503     total_length;
1504
1505   MagickStatusType
1506     status;
1507
1508   PrimitiveInfo
1509     *dash_polygon;
1510
1511   register ssize_t
1512     i;
1513
1514   register MagickRealType
1515     dx,
1516     dy;
1517
1518   size_t
1519     number_vertices;
1520
1521   assert(draw_info != (const DrawInfo *) NULL);
1522   if (image->debug != MagickFalse)
1523     (void) LogMagickEvent(DrawEvent,GetMagickModule(),"    begin draw-dash");
1524   clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
1525   clone_info->miterlimit=0;
1526   for (i=0; primitive_info[i].primitive != UndefinedPrimitive; i++) ;
1527   number_vertices=(size_t) i;
1528   dash_polygon=(PrimitiveInfo *) AcquireQuantumMemory((size_t)
1529     (2UL*number_vertices+1UL),sizeof(*dash_polygon));
1530   if (dash_polygon == (PrimitiveInfo *) NULL)
1531     return(MagickFalse);
1532   dash_polygon[0]=primitive_info[0];
1533   scale=ExpandAffine(&draw_info->affine);
1534   length=scale*(draw_info->dash_pattern[0]-0.5);
1535   offset=draw_info->dash_offset != 0.0 ? scale*draw_info->dash_offset : 0.0;
1536   j=1;
1537   for (n=0; offset > 0.0; j=0)
1538   {
1539     if (draw_info->dash_pattern[n] <= 0.0)
1540       break;
1541     length=scale*(draw_info->dash_pattern[n]+(n == 0 ? -0.5 : 0.5));
1542     if (offset > length)
1543       {
1544         offset-=length;
1545         n++;
1546         length=scale*(draw_info->dash_pattern[n]+(n == 0 ? -0.5 : 0.5));
1547         continue;
1548       }
1549     if (offset < length)
1550       {
1551         length-=offset;
1552         offset=0.0;
1553         break;
1554       }
1555     offset=0.0;
1556     n++;
1557   }
1558   status=MagickTrue;
1559   maximum_length=0.0;
1560   total_length=0.0;
1561   for (i=1; i < (ssize_t) number_vertices; i++)
1562   {
1563     dx=primitive_info[i].point.x-primitive_info[i-1].point.x;
1564     dy=primitive_info[i].point.y-primitive_info[i-1].point.y;
1565     maximum_length=hypot((double) dx,dy);
1566     if (length == 0.0)
1567       {
1568         n++;
1569         if (draw_info->dash_pattern[n] == 0.0)
1570           n=0;
1571         length=scale*(draw_info->dash_pattern[n]+(n == 0 ? -0.5 : 0.5));
1572       }
1573     for (total_length=0.0; (total_length+length) < maximum_length; )
1574     {
1575       total_length+=length;
1576       if ((n & 0x01) != 0)
1577         {
1578           dash_polygon[0]=primitive_info[0];
1579           dash_polygon[0].point.x=(double) (primitive_info[i-1].point.x+dx*
1580             total_length/maximum_length);
1581           dash_polygon[0].point.y=(double) (primitive_info[i-1].point.y+dy*
1582             total_length/maximum_length);
1583           j=1;
1584         }
1585       else
1586         {
1587           if ((j+1) > (ssize_t) (2*number_vertices))
1588             break;
1589           dash_polygon[j]=primitive_info[i-1];
1590           dash_polygon[j].point.x=(double) (primitive_info[i-1].point.x+dx*
1591             total_length/maximum_length);
1592           dash_polygon[j].point.y=(double) (primitive_info[i-1].point.y+dy*
1593             total_length/maximum_length);
1594           dash_polygon[j].coordinates=1;
1595           j++;
1596           dash_polygon[0].coordinates=(size_t) j;
1597           dash_polygon[j].primitive=UndefinedPrimitive;
1598           status|=DrawStrokePolygon(image,clone_info,dash_polygon);
1599         }
1600       n++;
1601       if (draw_info->dash_pattern[n] == 0.0)
1602         n=0;
1603       length=scale*(draw_info->dash_pattern[n]+(n == 0 ? -0.5 : 0.5));
1604     }
1605     length-=(maximum_length-total_length);
1606     if ((n & 0x01) != 0)
1607       continue;
1608     dash_polygon[j]=primitive_info[i];
1609     dash_polygon[j].coordinates=1;
1610     j++;
1611   }
1612   if ((total_length < maximum_length) && ((n & 0x01) == 0) && (j > 1))
1613     {
1614       dash_polygon[j]=primitive_info[i-1];
1615       dash_polygon[j].point.x+=MagickEpsilon;
1616       dash_polygon[j].point.y+=MagickEpsilon;
1617       dash_polygon[j].coordinates=1;
1618       j++;
1619       dash_polygon[0].coordinates=(size_t) j;
1620       dash_polygon[j].primitive=UndefinedPrimitive;
1621       status|=DrawStrokePolygon(image,clone_info,dash_polygon);
1622     }
1623   dash_polygon=(PrimitiveInfo *) RelinquishMagickMemory(dash_polygon);
1624   clone_info=DestroyDrawInfo(clone_info);
1625   if (image->debug != MagickFalse)
1626     (void) LogMagickEvent(DrawEvent,GetMagickModule(),"    end draw-dash");
1627   return(status != 0 ? MagickTrue : MagickFalse);
1628 }
1629 \f
1630 /*
1631 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1632 %                                                                             %
1633 %                                                                             %
1634 %                                                                             %
1635 %   D r a w I m a g e                                                         %
1636 %                                                                             %
1637 %                                                                             %
1638 %                                                                             %
1639 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1640 %
1641 %  DrawImage() draws a graphic primitive on your image.  The primitive
1642 %  may be represented as a string or filename.  Precede the filename with an
1643 %  "at" sign (@) and the contents of the file are drawn on the image.  You
1644 %  can affect how text is drawn by setting one or more members of the draw
1645 %  info structure.
1646 %
1647 %  The format of the DrawImage method is:
1648 %
1649 %      MagickBooleanType DrawImage(Image *image,const DrawInfo *draw_info)
1650 %
1651 %  A description of each parameter follows:
1652 %
1653 %    o image: the image.
1654 %
1655 %    o draw_info: the draw info.
1656 %
1657 */
1658
1659 static inline MagickBooleanType IsPoint(const char *point)
1660 {
1661   char
1662     *p;
1663
1664   double
1665     value;
1666
1667   value=strtod(point,&p);
1668   return((value == 0.0) && (p == point) ? MagickFalse : MagickTrue);
1669 }
1670
1671 static inline void TracePoint(PrimitiveInfo *primitive_info,
1672   const PointInfo point)
1673 {
1674   primitive_info->coordinates=1;
1675   primitive_info->point=point;
1676 }
1677
1678 MagickExport MagickBooleanType DrawImage(Image *image,const DrawInfo *draw_info)
1679 {
1680 #define RenderImageTag  "Render/Image"
1681
1682   AffineMatrix
1683     affine,
1684     current;
1685
1686   char
1687     key[2*MaxTextExtent],
1688     keyword[MaxTextExtent],
1689     geometry[MaxTextExtent],
1690     name[MaxTextExtent],
1691     pattern[MaxTextExtent],
1692     *primitive,
1693     *token;
1694
1695   const char
1696     *q;
1697
1698   DrawInfo
1699     **graphic_context;
1700
1701   ssize_t
1702     j,
1703     k,
1704     n;
1705
1706   MagickBooleanType
1707     proceed,
1708     status;
1709
1710   MagickRealType
1711     angle,
1712     factor,
1713     primitive_extent;
1714
1715   PointInfo
1716     point;
1717
1718   PixelPacket
1719     start_color;
1720
1721   PrimitiveInfo
1722     *primitive_info;
1723
1724   PrimitiveType
1725     primitive_type;
1726
1727   register const char
1728     *p;
1729
1730   register ssize_t
1731     i,
1732     x;
1733
1734   SegmentInfo
1735     bounds;
1736
1737   size_t
1738     length;
1739
1740   size_t
1741     number_points;
1742
1743   /*
1744     Ensure the annotation info is valid.
1745   */
1746   assert(image != (Image *) NULL);
1747   assert(image->signature == MagickSignature);
1748   if (image->debug != MagickFalse)
1749     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1750   assert(draw_info != (DrawInfo *) NULL);
1751   assert(draw_info->signature == MagickSignature);
1752   if (image->debug != MagickFalse)
1753     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
1754   if ((draw_info->primitive == (char *) NULL) ||
1755       (*draw_info->primitive == '\0'))
1756     return(MagickFalse);
1757   if (image->debug != MagickFalse)
1758     (void) LogMagickEvent(DrawEvent,GetMagickModule(),"begin draw-image");
1759   if (*draw_info->primitive != '@')
1760     primitive=AcquireString(draw_info->primitive);
1761   else
1762     primitive=FileToString(draw_info->primitive+1,~0,&image->exception);
1763   if (primitive == (char *) NULL)
1764     return(MagickFalse);
1765   primitive_extent=(MagickRealType) strlen(primitive);
1766   (void) SetImageArtifact(image,"MVG",primitive);
1767   n=0;
1768   /*
1769     Allocate primitive info memory.
1770   */
1771   graphic_context=(DrawInfo **) AcquireAlignedMemory(1,
1772     sizeof(*graphic_context));
1773   if (graphic_context == (DrawInfo **) NULL)
1774     {
1775       primitive=DestroyString(primitive);
1776       ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
1777         image->filename);
1778     }
1779   number_points=2047;
1780   primitive_info=(PrimitiveInfo *) AcquireQuantumMemory((size_t) number_points,
1781     sizeof(*primitive_info));
1782   if (primitive_info == (PrimitiveInfo *) NULL)
1783     {
1784       primitive=DestroyString(primitive);
1785       for ( ; n >= 0; n--)
1786         graphic_context[n]=DestroyDrawInfo(graphic_context[n]);
1787       graphic_context=(DrawInfo **) RelinquishMagickMemory(graphic_context);
1788       ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
1789         image->filename);
1790     }
1791   graphic_context[n]=CloneDrawInfo((ImageInfo *) NULL,draw_info);
1792   graphic_context[n]->viewbox=image->page;
1793   if ((image->page.width == 0) || (image->page.height == 0))
1794     {
1795       graphic_context[n]->viewbox.width=image->columns;
1796       graphic_context[n]->viewbox.height=image->rows;
1797     }
1798   token=AcquireString(primitive);
1799   (void) QueryColorDatabase("#000000",&start_color,&image->exception);
1800   if (SetImageStorageClass(image,DirectClass) == MagickFalse)
1801     return(MagickFalse);
1802   status=MagickTrue;
1803   for (q=primitive; *q != '\0'; )
1804   {
1805     /*
1806       Interpret graphic primitive.
1807     */
1808     GetMagickToken(q,&q,keyword);
1809     if (*keyword == '\0')
1810       break;
1811     if (*keyword == '#')
1812       {
1813         /*
1814           Comment.
1815         */
1816         while ((*q != '\n') && (*q != '\0'))
1817           q++;
1818         continue;
1819       }
1820     p=q-strlen(keyword)-1;
1821     primitive_type=UndefinedPrimitive;
1822     current=graphic_context[n]->affine;
1823     GetAffineMatrix(&affine);
1824     switch (*keyword)
1825     {
1826       case ';':
1827         break;
1828       case 'a':
1829       case 'A':
1830       {
1831         if (LocaleCompare("affine",keyword) == 0)
1832           {
1833             GetMagickToken(q,&q,token);
1834             affine.sx=StringToDouble(token);
1835             GetMagickToken(q,&q,token);
1836             if (*token == ',')
1837               GetMagickToken(q,&q,token);
1838             affine.rx=StringToDouble(token);
1839             GetMagickToken(q,&q,token);
1840             if (*token == ',')
1841               GetMagickToken(q,&q,token);
1842             affine.ry=StringToDouble(token);
1843             GetMagickToken(q,&q,token);
1844             if (*token == ',')
1845               GetMagickToken(q,&q,token);
1846             affine.sy=StringToDouble(token);
1847             GetMagickToken(q,&q,token);
1848             if (*token == ',')
1849               GetMagickToken(q,&q,token);
1850             affine.tx=StringToDouble(token);
1851             GetMagickToken(q,&q,token);
1852             if (*token == ',')
1853               GetMagickToken(q,&q,token);
1854             affine.ty=StringToDouble(token);
1855             break;
1856           }
1857         if (LocaleCompare("arc",keyword) == 0)
1858           {
1859             primitive_type=ArcPrimitive;
1860             break;
1861           }
1862         status=MagickFalse;
1863         break;
1864       }
1865       case 'b':
1866       case 'B':
1867       {
1868         if (LocaleCompare("bezier",keyword) == 0)
1869           {
1870             primitive_type=BezierPrimitive;
1871             break;
1872           }
1873         if (LocaleCompare("border-color",keyword) == 0)
1874           {
1875             GetMagickToken(q,&q,token);
1876             (void) QueryColorDatabase(token,&graphic_context[n]->border_color,
1877               &image->exception);
1878             break;
1879           }
1880         status=MagickFalse;
1881         break;
1882       }
1883       case 'c':
1884       case 'C':
1885       {
1886         if (LocaleCompare("clip-path",keyword) == 0)
1887           {
1888             /*
1889               Create clip mask.
1890             */
1891             GetMagickToken(q,&q,token);
1892             (void) CloneString(&graphic_context[n]->clip_mask,token);
1893             (void) DrawClipPath(image,graphic_context[n],
1894               graphic_context[n]->clip_mask);
1895             break;
1896           }
1897         if (LocaleCompare("clip-rule",keyword) == 0)
1898           {
1899             ssize_t
1900               fill_rule;
1901
1902             GetMagickToken(q,&q,token);
1903             fill_rule=ParseMagickOption(MagickFillRuleOptions,MagickFalse,
1904               token);
1905             if (fill_rule == -1)
1906               {
1907                 status=MagickFalse;
1908                 break;
1909               }
1910             graphic_context[n]->fill_rule=(FillRule) fill_rule;
1911             break;
1912           }
1913         if (LocaleCompare("clip-units",keyword) == 0)
1914           {
1915             ssize_t
1916               clip_units;
1917
1918             GetMagickToken(q,&q,token);
1919             clip_units=ParseMagickOption(MagickClipPathOptions,MagickFalse,
1920               token);
1921             if (clip_units == -1)
1922               {
1923                 status=MagickFalse;
1924                 break;
1925               }
1926             graphic_context[n]->clip_units=(ClipPathUnits) clip_units;
1927             if (clip_units == ObjectBoundingBox)
1928               {
1929                 GetAffineMatrix(&current);
1930                 affine.sx=draw_info->bounds.x2;
1931                 affine.sy=draw_info->bounds.y2;
1932                 affine.tx=draw_info->bounds.x1;
1933                 affine.ty=draw_info->bounds.y1;
1934                 break;
1935               }
1936             break;
1937           }
1938         if (LocaleCompare("circle",keyword) == 0)
1939           {
1940             primitive_type=CirclePrimitive;
1941             break;
1942           }
1943         if (LocaleCompare("color",keyword) == 0)
1944           {
1945             primitive_type=ColorPrimitive;
1946             break;
1947           }
1948         status=MagickFalse;
1949         break;
1950       }
1951       case 'd':
1952       case 'D':
1953       {
1954         if (LocaleCompare("decorate",keyword) == 0)
1955           {
1956             ssize_t
1957               decorate;
1958
1959             GetMagickToken(q,&q,token);
1960             decorate=ParseMagickOption(MagickDecorateOptions,MagickFalse,
1961               token);
1962             if (decorate == -1)
1963               {
1964                 status=MagickFalse;
1965                 break;
1966               }
1967             graphic_context[n]->decorate=(DecorationType) decorate;
1968             break;
1969           }
1970         status=MagickFalse;
1971         break;
1972       }
1973       case 'e':
1974       case 'E':
1975       {
1976         if (LocaleCompare("ellipse",keyword) == 0)
1977           {
1978             primitive_type=EllipsePrimitive;
1979             break;
1980           }
1981         if (LocaleCompare("encoding",keyword) == 0)
1982           {
1983             GetMagickToken(q,&q,token);
1984             (void) CloneString(&graphic_context[n]->encoding,token);
1985             break;
1986           }
1987         status=MagickFalse;
1988         break;
1989       }
1990       case 'f':
1991       case 'F':
1992       {
1993         if (LocaleCompare("fill",keyword) == 0)
1994           {
1995             GetMagickToken(q,&q,token);
1996             (void) FormatMagickString(pattern,MaxTextExtent,"%s",token);
1997             if (GetImageArtifact(image,pattern) != (const char *) NULL)
1998               (void) DrawPatternPath(image,draw_info,token,
1999                 &graphic_context[n]->fill_pattern);
2000             else
2001               {
2002                 status=QueryColorDatabase(token,&graphic_context[n]->fill,
2003                   &image->exception);
2004                 if (status == MagickFalse)
2005                   {
2006                     ImageInfo
2007                       *pattern_info;
2008
2009                     pattern_info=AcquireImageInfo();
2010                     (void) CopyMagickString(pattern_info->filename,token,
2011                       MaxTextExtent);
2012                     graphic_context[n]->fill_pattern=
2013                       ReadImage(pattern_info,&image->exception);
2014                     CatchException(&image->exception);
2015                     pattern_info=DestroyImageInfo(pattern_info);
2016                   }
2017               }
2018             break;
2019           }
2020         if (LocaleCompare("fill-opacity",keyword) == 0)
2021           {
2022             GetMagickToken(q,&q,token);
2023             factor=strchr(token,'%') != (char *) NULL ? 0.01 : 1.0;
2024             graphic_context[n]->fill.opacity=ClampToQuantum((MagickRealType)
2025               QuantumRange*(1.0-factor*StringToDouble(token)));
2026             break;
2027           }
2028         if (LocaleCompare("fill-rule",keyword) == 0)
2029           {
2030             ssize_t
2031               fill_rule;
2032
2033             GetMagickToken(q,&q,token);
2034             fill_rule=ParseMagickOption(MagickFillRuleOptions,MagickFalse,
2035               token);
2036             if (fill_rule == -1)
2037               {
2038                 status=MagickFalse;
2039                 break;
2040               }
2041             graphic_context[n]->fill_rule=(FillRule) fill_rule;
2042             break;
2043           }
2044         if (LocaleCompare("font",keyword) == 0)
2045           {
2046             GetMagickToken(q,&q,token);
2047             (void) CloneString(&graphic_context[n]->font,token);
2048             if (LocaleCompare("none",token) == 0)
2049               graphic_context[n]->font=(char *)
2050                 RelinquishMagickMemory(graphic_context[n]->font);
2051             break;
2052           }
2053         if (LocaleCompare("font-family",keyword) == 0)
2054           {
2055             GetMagickToken(q,&q,token);
2056             (void) CloneString(&graphic_context[n]->family,token);
2057             break;
2058           }
2059         if (LocaleCompare("font-size",keyword) == 0)
2060           {
2061             GetMagickToken(q,&q,token);
2062             graphic_context[n]->pointsize=StringToDouble(token);
2063             break;
2064           }
2065         if (LocaleCompare("font-stretch",keyword) == 0)
2066           {
2067             ssize_t
2068               stretch;
2069
2070             GetMagickToken(q,&q,token);
2071             stretch=ParseMagickOption(MagickStretchOptions,MagickFalse,token);
2072             if (stretch == -1)
2073               {
2074                 status=MagickFalse;
2075                 break;
2076               }
2077             graphic_context[n]->stretch=(StretchType) stretch;
2078             break;
2079           }
2080         if (LocaleCompare("font-style",keyword) == 0)
2081           {
2082             ssize_t
2083               style;
2084
2085             GetMagickToken(q,&q,token);
2086             style=ParseMagickOption(MagickStyleOptions,MagickFalse,token);
2087             if (style == -1)
2088               {
2089                 status=MagickFalse;
2090                 break;
2091               }
2092             graphic_context[n]->style=(StyleType) style;
2093             break;
2094           }
2095         if (LocaleCompare("font-weight",keyword) == 0)
2096           {
2097             GetMagickToken(q,&q,token);
2098             graphic_context[n]->weight=StringToUnsignedLong(token);
2099             if (LocaleCompare(token,"all") == 0)
2100               graphic_context[n]->weight=0;
2101             if (LocaleCompare(token,"bold") == 0)
2102               graphic_context[n]->weight=700;
2103             if (LocaleCompare(token,"bolder") == 0)
2104               if (graphic_context[n]->weight <= 800)
2105                 graphic_context[n]->weight+=100;
2106             if (LocaleCompare(token,"lighter") == 0)
2107               if (graphic_context[n]->weight >= 100)
2108                 graphic_context[n]->weight-=100;
2109             if (LocaleCompare(token,"normal") == 0)
2110               graphic_context[n]->weight=400;
2111             break;
2112           }
2113         status=MagickFalse;
2114         break;
2115       }
2116       case 'g':
2117       case 'G':
2118       {
2119         if (LocaleCompare("gradient-units",keyword) == 0)
2120           {
2121             GetMagickToken(q,&q,token);
2122             break;
2123           }
2124         if (LocaleCompare("gravity",keyword) == 0)
2125           {
2126             ssize_t
2127               gravity;
2128
2129             GetMagickToken(q,&q,token);
2130             gravity=ParseMagickOption(MagickGravityOptions,MagickFalse,token);
2131             if (gravity == -1)
2132               {
2133                 status=MagickFalse;
2134                 break;
2135               }
2136             graphic_context[n]->gravity=(GravityType) gravity;
2137             break;
2138           }
2139         status=MagickFalse;
2140         break;
2141       }
2142       case 'i':
2143       case 'I':
2144       {
2145         if (LocaleCompare("image",keyword) == 0)
2146           {
2147             ssize_t
2148               compose;
2149
2150             primitive_type=ImagePrimitive;
2151             GetMagickToken(q,&q,token);
2152             compose=ParseMagickOption(MagickComposeOptions,MagickFalse,token);
2153             if (compose == -1)
2154               {
2155                 status=MagickFalse;
2156                 break;
2157               }
2158             graphic_context[n]->compose=(CompositeOperator) compose;
2159             break;
2160           }
2161         if (LocaleCompare("interline-spacing",keyword) == 0)
2162           {
2163             GetMagickToken(q,&q,token);
2164             graphic_context[n]->interline_spacing=StringToDouble(token);
2165             break;
2166           }
2167         if (LocaleCompare("interword-spacing",keyword) == 0)
2168           {
2169             GetMagickToken(q,&q,token);
2170             graphic_context[n]->interword_spacing=StringToDouble(token);
2171             break;
2172           }
2173         status=MagickFalse;
2174         break;
2175       }
2176       case 'k':
2177       case 'K':
2178       {
2179         if (LocaleCompare("kerning",keyword) == 0)
2180           {
2181             GetMagickToken(q,&q,token);
2182             graphic_context[n]->kerning=StringToDouble(token);
2183             break;
2184           }
2185         status=MagickFalse;
2186         break;
2187       }
2188       case 'l':
2189       case 'L':
2190       {
2191         if (LocaleCompare("line",keyword) == 0)
2192           {
2193             primitive_type=LinePrimitive;
2194             break;
2195           }
2196         status=MagickFalse;
2197         break;
2198       }
2199       case 'm':
2200       case 'M':
2201       {
2202         if (LocaleCompare("matte",keyword) == 0)
2203           {
2204             primitive_type=MattePrimitive;
2205             break;
2206           }
2207         status=MagickFalse;
2208         break;
2209       }
2210       case 'o':
2211       case 'O':
2212       {
2213         if (LocaleCompare("offset",keyword) == 0)
2214           {
2215             GetMagickToken(q,&q,token);
2216             break;
2217           }
2218         if (LocaleCompare("opacity",keyword) == 0)
2219           {
2220             GetMagickToken(q,&q,token);
2221             factor=strchr(token,'%') != (char *) NULL ? 0.01 : 1.0;
2222             graphic_context[n]->opacity=ClampToQuantum((MagickRealType)
2223               QuantumRange*(1.0-((1.0-QuantumScale*graphic_context[n]->opacity)*
2224               factor*StringToDouble(token))));
2225             graphic_context[n]->fill.opacity=graphic_context[n]->opacity;
2226             graphic_context[n]->stroke.opacity=graphic_context[n]->opacity;
2227             break;
2228           }
2229         status=MagickFalse;
2230         break;
2231       }
2232       case 'p':
2233       case 'P':
2234       {
2235         if (LocaleCompare("path",keyword) == 0)
2236           {
2237             primitive_type=PathPrimitive;
2238             break;
2239           }
2240         if (LocaleCompare("point",keyword) == 0)
2241           {
2242             primitive_type=PointPrimitive;
2243             break;
2244           }
2245         if (LocaleCompare("polyline",keyword) == 0)
2246           {
2247             primitive_type=PolylinePrimitive;
2248             break;
2249           }
2250         if (LocaleCompare("polygon",keyword) == 0)
2251           {
2252             primitive_type=PolygonPrimitive;
2253             break;
2254           }
2255         if (LocaleCompare("pop",keyword) == 0)
2256           {
2257             GetMagickToken(q,&q,token);
2258             if (LocaleCompare("clip-path",token) == 0)
2259               break;
2260             if (LocaleCompare("defs",token) == 0)
2261               break;
2262             if (LocaleCompare("gradient",token) == 0)
2263               break;
2264             if (LocaleCompare("graphic-context",token) == 0)
2265               {
2266                 if (n <= 0)
2267                   {
2268                     (void) ThrowMagickException(&image->exception,
2269                       GetMagickModule(),DrawError,
2270                       "UnbalancedGraphicContextPushPop","`%s'",token);
2271                     n=0;
2272                     break;
2273                   }
2274                 if (graphic_context[n]->clip_mask != (char *) NULL)
2275                   if (LocaleCompare(graphic_context[n]->clip_mask,
2276                       graphic_context[n-1]->clip_mask) != 0)
2277                     (void) SetImageClipMask(image,(Image *) NULL);
2278                 graphic_context[n]=DestroyDrawInfo(graphic_context[n]);
2279                 n--;
2280                 break;
2281               }
2282             if (LocaleCompare("pattern",token) == 0)
2283               break;
2284             status=MagickFalse;
2285             break;
2286           }
2287         if (LocaleCompare("push",keyword) == 0)
2288           {
2289             GetMagickToken(q,&q,token);
2290             if (LocaleCompare("clip-path",token) == 0)
2291               {
2292                 char
2293                   name[MaxTextExtent];
2294
2295                 GetMagickToken(q,&q,token);
2296                 (void) FormatMagickString(name,MaxTextExtent,"%s",token);
2297                 for (p=q; *q != '\0'; )
2298                 {
2299                   GetMagickToken(q,&q,token);
2300                   if (LocaleCompare(token,"pop") != 0)
2301                     continue;
2302                   GetMagickToken(q,(const char **) NULL,token);
2303                   if (LocaleCompare(token,"clip-path") != 0)
2304                     continue;
2305                   break;
2306                 }
2307                 (void) CopyMagickString(token,p,(size_t) (q-p-4+1));
2308                 (void) SetImageArtifact(image,name,token);
2309                 GetMagickToken(q,&q,token);
2310                 break;
2311               }
2312             if (LocaleCompare("gradient",token) == 0)
2313               {
2314                 char
2315                   key[2*MaxTextExtent],
2316                   name[MaxTextExtent],
2317                   type[MaxTextExtent];
2318
2319                 ElementInfo
2320                   element;
2321
2322                 SegmentInfo
2323                   segment;
2324
2325                 GetMagickToken(q,&q,token);
2326                 (void) CopyMagickString(name,token,MaxTextExtent);
2327                 GetMagickToken(q,&q,token);
2328                 (void) CopyMagickString(type,token,MaxTextExtent);
2329                 GetMagickToken(q,&q,token);
2330                 segment.x1=StringToDouble(token);
2331                 element.cx=StringToDouble(token);
2332                 GetMagickToken(q,&q,token);
2333                 if (*token == ',')
2334                   GetMagickToken(q,&q,token);
2335                 segment.y1=StringToDouble(token);
2336                 element.cy=StringToDouble(token);
2337                 GetMagickToken(q,&q,token);
2338                 if (*token == ',')
2339                   GetMagickToken(q,&q,token);
2340                 segment.x2=StringToDouble(token);
2341                 element.major=StringToDouble(token);
2342                 GetMagickToken(q,&q,token);
2343                 if (*token == ',')
2344                   GetMagickToken(q,&q,token);
2345                 segment.y2=StringToDouble(token);
2346                 element.minor=StringToDouble(token);
2347                 if (LocaleCompare(type,"radial") == 0)
2348                   {
2349                     GetMagickToken(q,&q,token);
2350                     if (*token == ',')
2351                       GetMagickToken(q,&q,token);
2352                     element.angle=StringToDouble(token);
2353                   }
2354                 for (p=q; *q != '\0'; )
2355                 {
2356                   GetMagickToken(q,&q,token);
2357                   if (LocaleCompare(token,"pop") != 0)
2358                     continue;
2359                   GetMagickToken(q,(const char **) NULL,token);
2360                   if (LocaleCompare(token,"gradient") != 0)
2361                     continue;
2362                   break;
2363                 }
2364                 (void) CopyMagickString(token,p,(size_t) (q-p-4+1));
2365                 bounds.x1=graphic_context[n]->affine.sx*segment.x1+
2366                   graphic_context[n]->affine.ry*segment.y1+
2367                   graphic_context[n]->affine.tx;
2368                 bounds.y1=graphic_context[n]->affine.rx*segment.x1+
2369                   graphic_context[n]->affine.sy*segment.y1+
2370                   graphic_context[n]->affine.ty;
2371                 bounds.x2=graphic_context[n]->affine.sx*segment.x2+
2372                   graphic_context[n]->affine.ry*segment.y2+
2373                   graphic_context[n]->affine.tx;
2374                 bounds.y2=graphic_context[n]->affine.rx*segment.x2+
2375                   graphic_context[n]->affine.sy*segment.y2+
2376                   graphic_context[n]->affine.ty;
2377                 (void) FormatMagickString(key,MaxTextExtent,"%s",name);
2378                 (void) SetImageArtifact(image,key,token);
2379                 (void) FormatMagickString(key,MaxTextExtent,"%s-geometry",name);
2380                 (void) FormatMagickString(geometry,MaxTextExtent,
2381                   "%gx%g%+.15g%+.15g",
2382                   MagickMax(fabs(bounds.x2-bounds.x1+1.0),1.0),
2383                   MagickMax(fabs(bounds.y2-bounds.y1+1.0),1.0),
2384                   bounds.x1,bounds.y1);
2385                 (void) SetImageArtifact(image,key,geometry);
2386                 GetMagickToken(q,&q,token);
2387                 break;
2388               }
2389             if (LocaleCompare("pattern",token) == 0)
2390               {
2391                 RectangleInfo
2392                   bounds;
2393
2394                 GetMagickToken(q,&q,token);
2395                 (void) CopyMagickString(name,token,MaxTextExtent);
2396                 GetMagickToken(q,&q,token);
2397                 bounds.x=(ssize_t) ceil(StringToDouble(token)-0.5);
2398                 GetMagickToken(q,&q,token);
2399                 if (*token == ',')
2400                   GetMagickToken(q,&q,token);
2401                 bounds.y=(ssize_t) ceil(StringToDouble(token)-0.5);
2402                 GetMagickToken(q,&q,token);
2403                 if (*token == ',')
2404                   GetMagickToken(q,&q,token);
2405                 bounds.width=(size_t) floor(StringToDouble(token)+0.5);
2406                 GetMagickToken(q,&q,token);
2407                 if (*token == ',')
2408                   GetMagickToken(q,&q,token);
2409                 bounds.height=(size_t) floor(StringToDouble(token)+0.5);
2410                 for (p=q; *q != '\0'; )
2411                 {
2412                   GetMagickToken(q,&q,token);
2413                   if (LocaleCompare(token,"pop") != 0)
2414                     continue;
2415                   GetMagickToken(q,(const char **) NULL,token);
2416                   if (LocaleCompare(token,"pattern") != 0)
2417                     continue;
2418                   break;
2419                 }
2420                 (void) CopyMagickString(token,p,(size_t) (q-p-4+1));
2421                 (void) FormatMagickString(key,MaxTextExtent,"%s",name);
2422                 (void) SetImageArtifact(image,key,token);
2423                 (void) FormatMagickString(key,MaxTextExtent,"%s-geometry",name);
2424                 (void) FormatMagickString(geometry,MaxTextExtent,
2425                   "%.20gx%.20g%+.20gx%+.20g",(double) bounds.width,(double)
2426                   bounds.height,(double) bounds.x,(double) bounds.y);
2427                 (void) SetImageArtifact(image,key,geometry);
2428                 GetMagickToken(q,&q,token);
2429                 break;
2430               }
2431             if (LocaleCompare("graphic-context",token) == 0)
2432               {
2433                 n++;
2434                 graphic_context=(DrawInfo **) ResizeQuantumMemory(
2435                   graphic_context,(size_t) (n+1),sizeof(*graphic_context));
2436                 if (graphic_context == (DrawInfo **) NULL)
2437                   {
2438                     (void) ThrowMagickException(&image->exception,
2439                       GetMagickModule(),ResourceLimitError,
2440                       "MemoryAllocationFailed","`%s'",image->filename);
2441                     break;
2442                   }
2443                 graphic_context[n]=CloneDrawInfo((ImageInfo *) NULL,
2444                   graphic_context[n-1]);
2445                 break;
2446               }
2447             if (LocaleCompare("defs",token) == 0)
2448               break;
2449             status=MagickFalse;
2450             break;
2451           }
2452         status=MagickFalse;
2453         break;
2454       }
2455       case 'r':
2456       case 'R':
2457       {
2458         if (LocaleCompare("rectangle",keyword) == 0)
2459           {
2460             primitive_type=RectanglePrimitive;
2461             break;
2462           }
2463         if (LocaleCompare("rotate",keyword) == 0)
2464           {
2465             GetMagickToken(q,&q,token);
2466             angle=StringToDouble(token);
2467             affine.sx=cos(DegreesToRadians(fmod((double) angle,360.0)));
2468             affine.rx=sin(DegreesToRadians(fmod((double) angle,360.0)));
2469             affine.ry=(-sin(DegreesToRadians(fmod((double) angle,360.0))));
2470             affine.sy=cos(DegreesToRadians(fmod((double) angle,360.0)));
2471             break;
2472           }
2473         if (LocaleCompare("roundRectangle",keyword) == 0)
2474           {
2475             primitive_type=RoundRectanglePrimitive;
2476             break;
2477           }
2478         status=MagickFalse;
2479         break;
2480       }
2481       case 's':
2482       case 'S':
2483       {
2484         if (LocaleCompare("scale",keyword) == 0)
2485           {
2486             GetMagickToken(q,&q,token);
2487             affine.sx=StringToDouble(token);
2488             GetMagickToken(q,&q,token);
2489             if (*token == ',')
2490               GetMagickToken(q,&q,token);
2491             affine.sy=StringToDouble(token);
2492             break;
2493           }
2494         if (LocaleCompare("skewX",keyword) == 0)
2495           {
2496             GetMagickToken(q,&q,token);
2497             angle=StringToDouble(token);
2498             affine.ry=sin(DegreesToRadians(angle));
2499             break;
2500           }
2501         if (LocaleCompare("skewY",keyword) == 0)
2502           {
2503             GetMagickToken(q,&q,token);
2504             angle=StringToDouble(token);
2505             affine.rx=(-tan(DegreesToRadians(angle)/2.0));
2506             break;
2507           }
2508         if (LocaleCompare("stop-color",keyword) == 0)
2509           {
2510             PixelPacket
2511               stop_color;
2512
2513             GetMagickToken(q,&q,token);
2514             (void) QueryColorDatabase(token,&stop_color,&image->exception);
2515             (void) GradientImage(image,LinearGradient,ReflectSpread,
2516               &start_color,&stop_color);
2517             start_color=stop_color;
2518             GetMagickToken(q,&q,token);
2519             break;
2520           }
2521         if (LocaleCompare("stroke",keyword) == 0)
2522           {
2523             GetMagickToken(q,&q,token);
2524             (void) FormatMagickString(pattern,MaxTextExtent,"%s",token);
2525             if (GetImageArtifact(image,pattern) != (const char *) NULL)
2526               (void) DrawPatternPath(image,draw_info,token,
2527                 &graphic_context[n]->stroke_pattern);
2528             else
2529               {
2530                 status=QueryColorDatabase(token,&graphic_context[n]->stroke,
2531                   &image->exception);
2532                 if (status == MagickFalse)
2533                   {
2534                     ImageInfo
2535                       *pattern_info;
2536
2537                     pattern_info=AcquireImageInfo();
2538                     (void) CopyMagickString(pattern_info->filename,token,
2539                       MaxTextExtent);
2540                     graphic_context[n]->stroke_pattern=
2541                       ReadImage(pattern_info,&image->exception);
2542                     CatchException(&image->exception);
2543                     pattern_info=DestroyImageInfo(pattern_info);
2544                   }
2545               }
2546             break;
2547           }
2548         if (LocaleCompare("stroke-antialias",keyword) == 0)
2549           {
2550             GetMagickToken(q,&q,token);
2551             graphic_context[n]->stroke_antialias=
2552               StringToLong(token) != 0 ? MagickTrue : MagickFalse;
2553             break;
2554           }
2555         if (LocaleCompare("stroke-dasharray",keyword) == 0)
2556           {
2557             if (graphic_context[n]->dash_pattern != (double *) NULL)
2558               graphic_context[n]->dash_pattern=(double *)
2559                 RelinquishMagickMemory(graphic_context[n]->dash_pattern);
2560             if (IsPoint(q) != MagickFalse)
2561               {
2562                 const char
2563                   *p;
2564
2565                 p=q;
2566                 GetMagickToken(p,&p,token);
2567                 if (*token == ',')
2568                   GetMagickToken(p,&p,token);
2569                 for (x=0; IsPoint(token) != MagickFalse; x++)
2570                 {
2571                   GetMagickToken(p,&p,token);
2572                   if (*token == ',')
2573                     GetMagickToken(p,&p,token);
2574                 }
2575                 graphic_context[n]->dash_pattern=(double *)
2576                   AcquireQuantumMemory((size_t) (2UL*x+1UL),
2577                   sizeof(*graphic_context[n]->dash_pattern));
2578                 if (graphic_context[n]->dash_pattern == (double *) NULL)
2579                   {
2580                     (void) ThrowMagickException(&image->exception,
2581                       GetMagickModule(),ResourceLimitError,
2582                       "MemoryAllocationFailed","`%s'",image->filename);
2583                     break;
2584                   }
2585                 for (j=0; j < x; j++)
2586                 {
2587                   GetMagickToken(q,&q,token);
2588                   if (*token == ',')
2589                     GetMagickToken(q,&q,token);
2590                   graphic_context[n]->dash_pattern[j]=StringToDouble(token);
2591                 }
2592                 if ((x & 0x01) != 0)
2593                   for ( ; j < (2*x); j++)
2594                     graphic_context[n]->dash_pattern[j]=
2595                       graphic_context[n]->dash_pattern[j-x];
2596                 graphic_context[n]->dash_pattern[j]=0.0;
2597                 break;
2598               }
2599             GetMagickToken(q,&q,token);
2600             break;
2601           }
2602         if (LocaleCompare("stroke-dashoffset",keyword) == 0)
2603           {
2604             GetMagickToken(q,&q,token);
2605             graphic_context[n]->dash_offset=StringToDouble(token);
2606             break;
2607           }
2608         if (LocaleCompare("stroke-linecap",keyword) == 0)
2609           {
2610             ssize_t
2611               linecap;
2612
2613             GetMagickToken(q,&q,token);
2614             linecap=ParseMagickOption(MagickLineCapOptions,MagickFalse,token);
2615             if (linecap == -1)
2616               {
2617                 status=MagickFalse;
2618                 break;
2619               }
2620             graphic_context[n]->linecap=(LineCap) linecap;
2621             break;
2622           }
2623         if (LocaleCompare("stroke-linejoin",keyword) == 0)
2624           {
2625             ssize_t
2626               linejoin;
2627
2628             GetMagickToken(q,&q,token);
2629             linejoin=ParseMagickOption(MagickLineJoinOptions,MagickFalse,token);
2630             if (linejoin == -1)
2631               {
2632                 status=MagickFalse;
2633                 break;
2634               }
2635             graphic_context[n]->linejoin=(LineJoin) linejoin;
2636             break;
2637           }
2638         if (LocaleCompare("stroke-miterlimit",keyword) == 0)
2639           {
2640             GetMagickToken(q,&q,token);
2641             graphic_context[n]->miterlimit=StringToUnsignedLong(token);
2642             break;
2643           }
2644         if (LocaleCompare("stroke-opacity",keyword) == 0)
2645           {
2646             GetMagickToken(q,&q,token);
2647             factor=strchr(token,'%') != (char *) NULL ? 0.01 : 1.0;
2648             graphic_context[n]->stroke.opacity=ClampToQuantum((MagickRealType)
2649               QuantumRange*(1.0-factor*StringToDouble(token)));
2650             break;
2651           }
2652         if (LocaleCompare("stroke-width",keyword) == 0)
2653           {
2654             GetMagickToken(q,&q,token);
2655             graphic_context[n]->stroke_width=StringToDouble(token);
2656             break;
2657           }
2658         status=MagickFalse;
2659         break;
2660       }
2661       case 't':
2662       case 'T':
2663       {
2664         if (LocaleCompare("text",keyword) == 0)
2665           {
2666             primitive_type=TextPrimitive;
2667             break;
2668           }
2669         if (LocaleCompare("text-align",keyword) == 0)
2670           {
2671             ssize_t
2672               align;
2673
2674             GetMagickToken(q,&q,token);
2675             align=ParseMagickOption(MagickAlignOptions,MagickFalse,token);
2676             if (align == -1)
2677               {
2678                 status=MagickFalse;
2679                 break;
2680               }
2681             graphic_context[n]->align=(AlignType) align;
2682             break;
2683           }
2684         if (LocaleCompare("text-anchor",keyword) == 0)
2685           {
2686             ssize_t
2687               align;
2688
2689             GetMagickToken(q,&q,token);
2690             align=ParseMagickOption(MagickAlignOptions,MagickFalse,token);
2691             if (align == -1)
2692               {
2693                 status=MagickFalse;
2694                 break;
2695               }
2696             graphic_context[n]->align=(AlignType) align;
2697             break;
2698           }
2699         if (LocaleCompare("text-antialias",keyword) == 0)
2700           {
2701             GetMagickToken(q,&q,token);
2702             graphic_context[n]->text_antialias=
2703               StringToLong(token) != 0 ? MagickTrue : MagickFalse;
2704             break;
2705           }
2706         if (LocaleCompare("text-undercolor",keyword) == 0)
2707           {
2708             GetMagickToken(q,&q,token);
2709             (void) QueryColorDatabase(token,&graphic_context[n]->undercolor,
2710               &image->exception);
2711             break;
2712           }
2713         if (LocaleCompare("translate",keyword) == 0)
2714           {
2715             GetMagickToken(q,&q,token);
2716             affine.tx=StringToDouble(token);
2717             GetMagickToken(q,&q,token);
2718             if (*token == ',')
2719               GetMagickToken(q,&q,token);
2720             affine.ty=StringToDouble(token);
2721             break;
2722           }
2723         status=MagickFalse;
2724         break;
2725       }
2726       case 'v':
2727       case 'V':
2728       {
2729         if (LocaleCompare("viewbox",keyword) == 0)
2730           {
2731             GetMagickToken(q,&q,token);
2732             graphic_context[n]->viewbox.x=(ssize_t) ceil(StringToDouble(token)-
2733               0.5);
2734             GetMagickToken(q,&q,token);
2735             if (*token == ',')
2736               GetMagickToken(q,&q,token);
2737             graphic_context[n]->viewbox.y=(ssize_t) ceil(StringToDouble(token)-
2738               0.5);
2739             GetMagickToken(q,&q,token);
2740             if (*token == ',')
2741               GetMagickToken(q,&q,token);
2742             graphic_context[n]->viewbox.width=(size_t) floor(
2743               StringToDouble(token)+0.5);
2744             GetMagickToken(q,&q,token);
2745             if (*token == ',')
2746               GetMagickToken(q,&q,token);
2747             graphic_context[n]->viewbox.height=(size_t) floor(
2748               StringToDouble(token)+0.5);
2749             break;
2750           }
2751         status=MagickFalse;
2752         break;
2753       }
2754       default:
2755       {
2756         status=MagickFalse;
2757         break;
2758       }
2759     }
2760     if (status == MagickFalse)
2761       break;
2762     if ((affine.sx != 1.0) || (affine.rx != 0.0) || (affine.ry != 0.0) ||
2763         (affine.sy != 1.0) || (affine.tx != 0.0) || (affine.ty != 0.0))
2764       {
2765         graphic_context[n]->affine.sx=current.sx*affine.sx+current.ry*affine.rx;
2766         graphic_context[n]->affine.rx=current.rx*affine.sx+current.sy*affine.rx;
2767         graphic_context[n]->affine.ry=current.sx*affine.ry+current.ry*affine.sy;
2768         graphic_context[n]->affine.sy=current.rx*affine.ry+current.sy*affine.sy;
2769         graphic_context[n]->affine.tx=
2770           current.sx*affine.tx+current.ry*affine.ty+current.tx;
2771         graphic_context[n]->affine.ty=
2772           current.rx*affine.tx+current.sy*affine.ty+current.ty;
2773       }
2774     if (primitive_type == UndefinedPrimitive)
2775       {
2776         if (image->debug != MagickFalse)
2777           (void) LogMagickEvent(DrawEvent,GetMagickModule(),"  %.*s",
2778             (int) (q-p),p);
2779         continue;
2780       }
2781     /*
2782       Parse the primitive attributes.
2783     */
2784     i=0;
2785     j=0;
2786     primitive_info[0].point.x=0.0;
2787     primitive_info[0].point.y=0.0;
2788     for (x=0; *q != '\0'; x++)
2789     {
2790       /*
2791         Define points.
2792       */
2793       if (IsPoint(q) == MagickFalse)
2794         break;
2795       GetMagickToken(q,&q,token);
2796       point.x=StringToDouble(token);
2797       GetMagickToken(q,&q,token);
2798       if (*token == ',')
2799         GetMagickToken(q,&q,token);
2800       point.y=StringToDouble(token);
2801       GetMagickToken(q,(const char **) NULL,token);
2802       if (*token == ',')
2803         GetMagickToken(q,&q,token);
2804       primitive_info[i].primitive=primitive_type;
2805       primitive_info[i].point=point;
2806       primitive_info[i].coordinates=0;
2807       primitive_info[i].method=FloodfillMethod;
2808       i++;
2809       if (i < (ssize_t) number_points)
2810         continue;
2811       number_points<<=1;
2812       primitive_info=(PrimitiveInfo *) ResizeQuantumMemory(primitive_info,
2813         (size_t) number_points,sizeof(*primitive_info));
2814       if (primitive_info == (PrimitiveInfo *) NULL)
2815         {
2816           (void) ThrowMagickException(&image->exception,GetMagickModule(),
2817             ResourceLimitError,"MemoryAllocationFailed","`%s'",image->filename);
2818           break;
2819         }
2820     }
2821     primitive_info[j].primitive=primitive_type;
2822     primitive_info[j].coordinates=(size_t) x;
2823     primitive_info[j].method=FloodfillMethod;
2824     primitive_info[j].text=(char *) NULL;
2825     /*
2826       Circumscribe primitive within a circle.
2827     */
2828     bounds.x1=primitive_info[j].point.x;
2829     bounds.y1=primitive_info[j].point.y;
2830     bounds.x2=primitive_info[j].point.x;
2831     bounds.y2=primitive_info[j].point.y;
2832     for (k=1; k < (ssize_t) primitive_info[j].coordinates; k++)
2833     {
2834       point=primitive_info[j+k].point;
2835       if (point.x < bounds.x1)
2836         bounds.x1=point.x;
2837       if (point.y < bounds.y1)
2838         bounds.y1=point.y;
2839       if (point.x > bounds.x2)
2840         bounds.x2=point.x;
2841       if (point.y > bounds.y2)
2842         bounds.y2=point.y;
2843     }
2844     /*
2845       Speculate how many points our primitive might consume.
2846     */
2847     length=primitive_info[j].coordinates;
2848     switch (primitive_type)
2849     {
2850       case RectanglePrimitive:
2851       {
2852         length*=5;
2853         break;
2854       }
2855       case RoundRectanglePrimitive:
2856       {
2857         length*=5+8*BezierQuantum;
2858         break;
2859       }
2860       case BezierPrimitive:
2861       {
2862         if (primitive_info[j].coordinates > 107)
2863           (void) ThrowMagickException(&image->exception,GetMagickModule(),
2864             DrawError,"TooManyBezierCoordinates","`%s'",token);
2865         length=BezierQuantum*primitive_info[j].coordinates;
2866         break;
2867       }
2868       case PathPrimitive:
2869       {
2870         char
2871           *s,
2872           *t;
2873
2874         GetMagickToken(q,&q,token);
2875         length=1;
2876         t=token;
2877         for (s=token; *s != '\0'; s=t)
2878         {
2879           double
2880             value;
2881
2882           value=strtod(s,&t);
2883           if (s == t)
2884             {
2885               t++;
2886               continue;
2887             }
2888           length+=BezierQuantum;
2889         }
2890         break;
2891       }
2892       case CirclePrimitive:
2893       case ArcPrimitive:
2894       case EllipsePrimitive:
2895       {
2896         MagickRealType
2897           alpha,
2898           beta,
2899           radius;
2900
2901         alpha=bounds.x2-bounds.x1;
2902         beta=bounds.y2-bounds.y1;
2903         radius=hypot((double) alpha,(double) beta);
2904         length=2*((size_t) (MagickPI*radius))+6*BezierQuantum+360+1;
2905         break;
2906       }
2907       default:
2908         break;
2909     }
2910     if ((size_t) (i+length) >= number_points)
2911       {
2912         /*
2913           Resize based on speculative points required by primitive.
2914         */
2915         number_points+=length+1;
2916         primitive_info=(PrimitiveInfo *) ResizeQuantumMemory(primitive_info,
2917           (size_t) number_points,sizeof(*primitive_info));
2918         if (primitive_info == (PrimitiveInfo *) NULL)
2919           {
2920             (void) ThrowMagickException(&image->exception,GetMagickModule(),
2921               ResourceLimitError,"MemoryAllocationFailed","`%s'",
2922               image->filename);
2923             break;
2924           }
2925       }
2926     switch (primitive_type)
2927     {
2928       case PointPrimitive:
2929       default:
2930       {
2931         if (primitive_info[j].coordinates != 1)
2932           {
2933             status=MagickFalse;
2934             break;
2935           }
2936         TracePoint(primitive_info+j,primitive_info[j].point);
2937         i=(ssize_t) (j+primitive_info[j].coordinates);
2938         break;
2939       }
2940       case LinePrimitive:
2941       {
2942         if (primitive_info[j].coordinates != 2)
2943           {
2944             status=MagickFalse;
2945             break;
2946           }
2947         TraceLine(primitive_info+j,primitive_info[j].point,
2948           primitive_info[j+1].point);
2949         i=(ssize_t) (j+primitive_info[j].coordinates);
2950         break;
2951       }
2952       case RectanglePrimitive:
2953       {
2954         if (primitive_info[j].coordinates != 2)
2955           {
2956             status=MagickFalse;
2957             break;
2958           }
2959         TraceRectangle(primitive_info+j,primitive_info[j].point,
2960           primitive_info[j+1].point);
2961         i=(ssize_t) (j+primitive_info[j].coordinates);
2962         break;
2963       }
2964       case RoundRectanglePrimitive:
2965       {
2966         if (primitive_info[j].coordinates != 3)
2967           {
2968             status=MagickFalse;
2969             break;
2970           }
2971         TraceRoundRectangle(primitive_info+j,primitive_info[j].point,
2972           primitive_info[j+1].point,primitive_info[j+2].point);
2973         i=(ssize_t) (j+primitive_info[j].coordinates);
2974         break;
2975       }
2976       case ArcPrimitive:
2977       {
2978         if (primitive_info[j].coordinates != 3)
2979           {
2980             primitive_type=UndefinedPrimitive;
2981             break;
2982           }
2983         TraceArc(primitive_info+j,primitive_info[j].point,
2984           primitive_info[j+1].point,primitive_info[j+2].point);
2985         i=(ssize_t) (j+primitive_info[j].coordinates);
2986         break;
2987       }
2988       case EllipsePrimitive:
2989       {
2990         if (primitive_info[j].coordinates != 3)
2991           {
2992             status=MagickFalse;
2993             break;
2994           }
2995         TraceEllipse(primitive_info+j,primitive_info[j].point,
2996           primitive_info[j+1].point,primitive_info[j+2].point);
2997         i=(ssize_t) (j+primitive_info[j].coordinates);
2998         break;
2999       }
3000       case CirclePrimitive:
3001       {
3002         if (primitive_info[j].coordinates != 2)
3003           {
3004             status=MagickFalse;
3005             break;
3006           }
3007         TraceCircle(primitive_info+j,primitive_info[j].point,
3008           primitive_info[j+1].point);
3009         i=(ssize_t) (j+primitive_info[j].coordinates);
3010         break;
3011       }
3012       case PolylinePrimitive:
3013         break;
3014       case PolygonPrimitive:
3015       {
3016         primitive_info[i]=primitive_info[j];
3017         primitive_info[i].coordinates=0;
3018         primitive_info[j].coordinates++;
3019         i++;
3020         break;
3021       }
3022       case BezierPrimitive:
3023       {
3024         if (primitive_info[j].coordinates < 3)
3025           {
3026             status=MagickFalse;
3027             break;
3028           }
3029         TraceBezier(primitive_info+j,primitive_info[j].coordinates);
3030         i=(ssize_t) (j+primitive_info[j].coordinates);
3031         break;
3032       }
3033       case PathPrimitive:
3034       {
3035         i=(ssize_t) (j+TracePath(primitive_info+j,token));
3036         break;
3037       }
3038       case ColorPrimitive:
3039       case MattePrimitive:
3040       {
3041         ssize_t
3042           method;
3043
3044         if (primitive_info[j].coordinates != 1)
3045           {
3046             status=MagickFalse;
3047             break;
3048           }
3049         GetMagickToken(q,&q,token);
3050         method=ParseMagickOption(MagickMethodOptions,MagickFalse,token);
3051         if (method == -1)
3052           {
3053             status=MagickFalse;
3054             break;
3055           }
3056         primitive_info[j].method=(PaintMethod) method;
3057         break;
3058       }
3059       case TextPrimitive:
3060       {
3061         if (primitive_info[j].coordinates != 1)
3062           {
3063             status=MagickFalse;
3064             break;
3065           }
3066         if (*token != ',')
3067           GetMagickToken(q,&q,token);
3068         primitive_info[j].text=AcquireString(token);
3069         break;
3070       }
3071       case ImagePrimitive:
3072       {
3073         if (primitive_info[j].coordinates != 2)
3074           {
3075             status=MagickFalse;
3076             break;
3077           }
3078         GetMagickToken(q,&q,token);
3079         primitive_info[j].text=AcquireString(token);
3080         break;
3081       }
3082     }
3083     if (primitive_info == (PrimitiveInfo *) NULL)
3084       break;
3085     if (image->debug != MagickFalse)
3086       (void) LogMagickEvent(DrawEvent,GetMagickModule(),"  %.*s",(int) (q-p),p);
3087     if (status == MagickFalse)
3088       break;
3089     primitive_info[i].primitive=UndefinedPrimitive;
3090     if (i == 0)
3091       continue;
3092     /*
3093       Transform points.
3094     */
3095     for (i=0; primitive_info[i].primitive != UndefinedPrimitive; i++)
3096     {
3097       point=primitive_info[i].point;
3098       primitive_info[i].point.x=graphic_context[n]->affine.sx*point.x+
3099         graphic_context[n]->affine.ry*point.y+graphic_context[n]->affine.tx;
3100       primitive_info[i].point.y=graphic_context[n]->affine.rx*point.x+
3101         graphic_context[n]->affine.sy*point.y+graphic_context[n]->affine.ty;
3102       point=primitive_info[i].point;
3103       if (point.x < graphic_context[n]->bounds.x1)
3104         graphic_context[n]->bounds.x1=point.x;
3105       if (point.y < graphic_context[n]->bounds.y1)
3106         graphic_context[n]->bounds.y1=point.y;
3107       if (point.x > graphic_context[n]->bounds.x2)
3108         graphic_context[n]->bounds.x2=point.x;
3109       if (point.y > graphic_context[n]->bounds.y2)
3110         graphic_context[n]->bounds.y2=point.y;
3111       if (primitive_info[i].primitive == ImagePrimitive)
3112         break;
3113       if (i >= (ssize_t) number_points)
3114         ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
3115     }
3116     if (graphic_context[n]->render != MagickFalse)
3117       {
3118         if ((n != 0) && (graphic_context[n]->clip_mask != (char *) NULL) &&
3119             (LocaleCompare(graphic_context[n]->clip_mask,
3120              graphic_context[n-1]->clip_mask) != 0))
3121           (void) DrawClipPath(image,graphic_context[n],
3122             graphic_context[n]->clip_mask);
3123         (void) DrawPrimitive(image,graphic_context[n],primitive_info);
3124       }
3125     if (primitive_info->text != (char *) NULL)
3126       primitive_info->text=(char *) RelinquishMagickMemory(
3127         primitive_info->text);
3128     proceed=SetImageProgress(image,RenderImageTag,q-primitive,(MagickSizeType)
3129       primitive_extent);
3130     if (proceed == MagickFalse)
3131       break;
3132   }
3133   if (image->debug != MagickFalse)
3134     (void) LogMagickEvent(DrawEvent,GetMagickModule(),"end draw-image");
3135   /*
3136     Relinquish resources.
3137   */
3138   token=DestroyString(token);
3139   if (primitive_info != (PrimitiveInfo *) NULL)
3140     primitive_info=(PrimitiveInfo *) RelinquishMagickMemory(primitive_info);
3141   primitive=DestroyString(primitive);
3142   for ( ; n >= 0; n--)
3143     graphic_context[n]=DestroyDrawInfo(graphic_context[n]);
3144   graphic_context=(DrawInfo **) RelinquishMagickMemory(graphic_context);
3145   if (status == MagickFalse)
3146     ThrowBinaryException(DrawError,"NonconformingDrawingPrimitiveDefinition",
3147       keyword);
3148   return(status);
3149 }
3150 \f
3151 /*
3152 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3153 %                                                                             %
3154 %                                                                             %
3155 %                                                                             %
3156 %     D r a w G r a d i e n t I m a g e                                       %
3157 %                                                                             %
3158 %                                                                             %
3159 %                                                                             %
3160 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3161 %
3162 %  DrawGradientImage() draws a linear gradient on the image.
3163 %
3164 %  The format of the DrawGradientImage method is:
3165 %
3166 %      MagickBooleanType DrawGradientImage(Image *image,
3167 %        const DrawInfo *draw_info)
3168 %
3169 %  A description of each parameter follows:
3170 %
3171 %    o image: the image.
3172 %
3173 %    o _info: the draw info.
3174 %
3175 */
3176
3177 static inline MagickRealType GetStopColorOffset(const GradientInfo *gradient,
3178   const ssize_t x,const ssize_t y)
3179 {
3180   switch (gradient->type)
3181   {
3182     case UndefinedGradient:
3183     case LinearGradient:
3184     {
3185       MagickRealType
3186         gamma,
3187         length,
3188         offset,
3189         scale;
3190
3191       PointInfo
3192         p,
3193         q;
3194
3195       const SegmentInfo
3196         *gradient_vector;
3197
3198       gradient_vector=(&gradient->gradient_vector);
3199       p.x=gradient_vector->x2-gradient_vector->x1;
3200       p.y=gradient_vector->y2-gradient_vector->y1;
3201       q.x=(double) x-gradient_vector->x1;
3202       q.y=(double) y-gradient_vector->y1;
3203       length=sqrt(q.x*q.x+q.y*q.y);
3204       gamma=sqrt(p.x*p.x+p.y*p.y)*length;
3205       gamma=1.0/(gamma <= MagickEpsilon ? 1.0 : gamma);
3206       scale=p.x*q.x+p.y*q.y;
3207       offset=gamma*scale*length;
3208       return(offset);
3209     }
3210     case RadialGradient:
3211     {
3212       MagickRealType
3213         length,
3214         offset;
3215
3216       PointInfo
3217         v;
3218
3219       v.x=(double) x-gradient->center.x;
3220       v.y=(double) y-gradient->center.y;
3221       length=sqrt(v.x*v.x+v.y*v.y);
3222       if (gradient->spread == RepeatSpread)
3223         return(length);
3224       offset=length/gradient->radius;
3225       return(offset);
3226     }
3227   }
3228   return(0.0);
3229 }
3230
3231 MagickExport MagickBooleanType DrawGradientImage(Image *image,
3232   const DrawInfo *draw_info)
3233 {
3234   CacheView
3235     *image_view;
3236
3237   const GradientInfo
3238     *gradient;
3239
3240   const SegmentInfo
3241     *gradient_vector;
3242
3243   ExceptionInfo
3244     *exception;
3245
3246   ssize_t
3247     y;
3248
3249   MagickBooleanType
3250     status;
3251
3252   MagickPixelPacket
3253     zero;
3254
3255   MagickRealType
3256     length;
3257
3258   PointInfo
3259     point;
3260
3261   RectangleInfo
3262     bounding_box;
3263
3264   /*
3265     Draw linear or radial gradient on image.
3266   */
3267   assert(image != (Image *) NULL);
3268   assert(image->signature == MagickSignature);
3269   if (image->debug != MagickFalse)
3270     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
3271   assert(draw_info != (const DrawInfo *) NULL);
3272   gradient=(&draw_info->gradient);
3273   gradient_vector=(&gradient->gradient_vector);
3274   point.x=gradient_vector->x2-gradient_vector->x1;
3275   point.y=gradient_vector->y2-gradient_vector->y1;
3276   length=sqrt(point.x*point.x+point.y*point.y);
3277   bounding_box=gradient->bounding_box;
3278   status=MagickTrue;
3279   exception=(&image->exception);
3280   GetMagickPixelPacket(image,&zero);
3281   image_view=AcquireCacheView(image);
3282 #if defined(MAGICKCORE_OPENMP_SUPPORT)
3283   #pragma omp parallel for schedule(dynamic,4) shared(status)
3284 #endif
3285   for (y=bounding_box.y; y < (ssize_t) bounding_box.height; y++)
3286   {
3287     ssize_t
3288       j;
3289
3290     MagickPixelPacket
3291       composite,
3292       pixel;
3293
3294     MagickRealType
3295       alpha,
3296       offset;
3297
3298     register IndexPacket
3299       *restrict indexes;
3300
3301     register ssize_t
3302       i,
3303       x;
3304
3305     register PixelPacket
3306       *restrict q;
3307
3308     if (status == MagickFalse)
3309       continue;
3310     q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
3311     if (q == (PixelPacket *) NULL)
3312       {
3313         status=MagickFalse;
3314         continue;
3315       }
3316     indexes=GetCacheViewAuthenticIndexQueue(image_view);
3317     pixel=zero;
3318     composite=zero;
3319     offset=GetStopColorOffset(gradient,0,y);
3320     if (gradient->type != RadialGradient)
3321       offset/=length;
3322     for (x=bounding_box.x; x < (ssize_t) bounding_box.width; x++)
3323     {
3324       SetMagickPixelPacket(image,q,indexes+x,&pixel);
3325       switch (gradient->spread)
3326       {
3327         case UndefinedSpread:
3328         case PadSpread:
3329         {
3330           if ((x != (ssize_t) ceil(gradient_vector->x1-0.5)) ||
3331               (y != (ssize_t) ceil(gradient_vector->y1-0.5)))
3332             {
3333               offset=GetStopColorOffset(gradient,x,y);
3334               if (gradient->type != RadialGradient)
3335                 offset/=length;
3336             }
3337           for (i=0; i < (ssize_t) gradient->number_stops; i++)
3338             if (offset < gradient->stops[i].offset)
3339               break;
3340           if ((offset < 0.0) || (i == 0))
3341             composite=gradient->stops[0].color;
3342           else
3343             if ((offset > 1.0) || (i == (ssize_t) gradient->number_stops))
3344               composite=gradient->stops[gradient->number_stops-1].color;
3345             else
3346               {
3347                 j=i;
3348                 i--;
3349                 alpha=(offset-gradient->stops[i].offset)/
3350                   (gradient->stops[j].offset-gradient->stops[i].offset);
3351                 MagickPixelCompositeBlend(&gradient->stops[i].color,1.0-alpha,
3352                   &gradient->stops[j].color,alpha,&composite);
3353               }
3354           break;
3355         }
3356         case ReflectSpread:
3357         {
3358           if ((x != (ssize_t) ceil(gradient_vector->x1-0.5)) ||
3359               (y != (ssize_t) ceil(gradient_vector->y1-0.5)))
3360             {
3361               offset=GetStopColorOffset(gradient,x,y);
3362               if (gradient->type != RadialGradient)
3363                 offset/=length;
3364             }
3365           if (offset < 0.0)
3366             offset=(-offset);
3367           if ((ssize_t) fmod(offset,2.0) == 0)
3368             offset=fmod(offset,1.0);
3369           else
3370             offset=1.0-fmod(offset,1.0);
3371           for (i=0; i < (ssize_t) gradient->number_stops; i++)
3372             if (offset < gradient->stops[i].offset)
3373               break;
3374           if (i == 0)
3375             composite=gradient->stops[0].color;
3376           else
3377             if (i == (ssize_t) gradient->number_stops)
3378               composite=gradient->stops[gradient->number_stops-1].color;
3379             else
3380               {
3381                 j=i;
3382                 i--;
3383                 alpha=(offset-gradient->stops[i].offset)/
3384                   (gradient->stops[j].offset-gradient->stops[i].offset);
3385                 MagickPixelCompositeBlend(&gradient->stops[i].color,1.0-alpha,
3386                   &gradient->stops[j].color,alpha,&composite);
3387               }
3388           break;
3389         }
3390         case RepeatSpread:
3391         {
3392           MagickBooleanType
3393             antialias;
3394
3395           MagickRealType
3396             repeat;
3397
3398           antialias=MagickFalse;
3399           repeat=0.0;
3400           if ((x != (ssize_t) ceil(gradient_vector->x1-0.5)) ||
3401               (y != (ssize_t) ceil(gradient_vector->y1-0.5)))
3402             {
3403               offset=GetStopColorOffset(gradient,x,y);
3404               if (gradient->type == LinearGradient)
3405                 {
3406                   repeat=fmod(offset,length);
3407                   if (repeat < 0.0)
3408                     repeat=length-fmod(-repeat,length);
3409                   else
3410                     repeat=fmod(offset,length);
3411                   antialias=(repeat < length) && ((repeat+1.0) > length) ?
3412                     MagickTrue : MagickFalse;
3413                   offset=repeat/length;
3414                 }
3415               else
3416                 {
3417                   repeat=fmod(offset,gradient->radius);
3418                   if (repeat < 0.0)
3419                     repeat=gradient->radius-fmod(-repeat,gradient->radius);
3420                   else
3421                     repeat=fmod(offset,gradient->radius);
3422                   antialias=repeat+1.0 > gradient->radius ?
3423                     MagickTrue : MagickFalse;
3424                   offset=repeat/gradient->radius;
3425                 }
3426             }
3427           for (i=0; i < (ssize_t) gradient->number_stops; i++)
3428             if (offset < gradient->stops[i].offset)
3429               break;
3430           if (i == 0)
3431             composite=gradient->stops[0].color;
3432           else
3433             if (i == (ssize_t) gradient->number_stops)
3434               composite=gradient->stops[gradient->number_stops-1].color;
3435             else
3436               {
3437                 j=i;
3438                 i--;
3439                 alpha=(offset-gradient->stops[i].offset)/
3440                   (gradient->stops[j].offset-gradient->stops[i].offset);
3441                 if (antialias != MagickFalse)
3442                   {
3443                     if (gradient->type == LinearGradient)
3444                       alpha=length-repeat;
3445                     else
3446                       alpha=gradient->radius-repeat;
3447                     i=0;
3448                     j=(ssize_t) gradient->number_stops-1L;
3449                   }
3450                 MagickPixelCompositeBlend(&gradient->stops[i].color,1.0-alpha,
3451                   &gradient->stops[j].color,alpha,&composite);
3452               }
3453           break;
3454         }
3455       }
3456       MagickPixelCompositeOver(&composite,composite.opacity,&pixel,
3457         pixel.opacity,&pixel);
3458       SetPixelPacket(image,&pixel,q,indexes+x);
3459       q++;
3460     }
3461     if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
3462       status=MagickFalse;
3463   }
3464   image_view=DestroyCacheView(image_view);
3465   return(status);
3466 }
3467 \f
3468 /*
3469 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3470 %                                                                             %
3471 %                                                                             %
3472 %                                                                             %
3473 %   D r a w P a t t e r n P a t h                                             %
3474 %                                                                             %
3475 %                                                                             %
3476 %                                                                             %
3477 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3478 %
3479 %  DrawPatternPath() draws a pattern.
3480 %
3481 %  The format of the DrawPatternPath method is:
3482 %
3483 %      MagickBooleanType DrawPatternPath(Image *image,const DrawInfo *draw_info,
3484 %        const char *name,Image **pattern)
3485 %
3486 %  A description of each parameter follows:
3487 %
3488 %    o image: the image.
3489 %
3490 %    o draw_info: the draw info.
3491 %
3492 %    o name: the pattern name.
3493 %
3494 %    o image: the image.
3495 %
3496 */
3497 MagickExport MagickBooleanType DrawPatternPath(Image *image,
3498   const DrawInfo *draw_info,const char *name,Image **pattern)
3499 {
3500   char
3501     property[MaxTextExtent];
3502
3503   const char
3504     *geometry,
3505     *path;
3506
3507   DrawInfo
3508     *clone_info;
3509
3510   ImageInfo
3511     *image_info;
3512
3513   MagickBooleanType
3514     status;
3515
3516   assert(image != (Image *) NULL);
3517   assert(image->signature == MagickSignature);
3518   if (image->debug != MagickFalse)
3519     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
3520   assert(draw_info != (const DrawInfo *) NULL);
3521   assert(name != (const char *) NULL);
3522   (void) FormatMagickString(property,MaxTextExtent,"%s",name);
3523   path=GetImageArtifact(image,property);
3524   if (path == (const char *) NULL)
3525     return(MagickFalse);
3526   (void) FormatMagickString(property,MaxTextExtent,"%s-geometry",name);
3527   geometry=GetImageArtifact(image,property);
3528   if (geometry == (const char *) NULL)
3529     return(MagickFalse);
3530   if ((*pattern) != (Image *) NULL)
3531     *pattern=DestroyImage(*pattern);
3532   image_info=AcquireImageInfo();
3533   image_info->size=AcquireString(geometry);
3534   *pattern=AcquireImage(image_info);
3535   image_info=DestroyImageInfo(image_info);
3536   (void) QueryColorDatabase("#00000000",&(*pattern)->background_color,
3537     &image->exception);
3538   (void) SetImageBackgroundColor(*pattern);
3539   if (image->debug != MagickFalse)
3540     (void) LogMagickEvent(DrawEvent,GetMagickModule(),
3541       "begin pattern-path %s %s",name,geometry);
3542   clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
3543   clone_info->fill_pattern=NewImageList();
3544   clone_info->stroke_pattern=NewImageList();
3545   (void) CloneString(&clone_info->primitive,path);
3546   status=DrawImage(*pattern,clone_info);
3547   clone_info=DestroyDrawInfo(clone_info);
3548   if (image->debug != MagickFalse)
3549     (void) LogMagickEvent(DrawEvent,GetMagickModule(),"end pattern-path");
3550   return(status);
3551 }
3552 \f
3553 /*
3554 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3555 %                                                                             %
3556 %                                                                             %
3557 %                                                                             %
3558 +   D r a w P o l y g o n P r i m i t i v e                                   %
3559 %                                                                             %
3560 %                                                                             %
3561 %                                                                             %
3562 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3563 %
3564 %  DrawPolygonPrimitive() draws a polygon on the image.
3565 %
3566 %  The format of the DrawPolygonPrimitive method is:
3567 %
3568 %      MagickBooleanType DrawPolygonPrimitive(Image *image,
3569 %        const DrawInfo *draw_info,const PrimitiveInfo *primitive_info)
3570 %
3571 %  A description of each parameter follows:
3572 %
3573 %    o image: the image.
3574 %
3575 %    o draw_info: the draw info.
3576 %
3577 %    o primitive_info: Specifies a pointer to a PrimitiveInfo structure.
3578 %
3579 */
3580
3581 static PolygonInfo **DestroyPolygonThreadSet(PolygonInfo **polygon_info)
3582 {
3583   register ssize_t
3584     i;
3585
3586   assert(polygon_info != (PolygonInfo **) NULL);
3587   for (i=0; i < (ssize_t) GetOpenMPMaximumThreads(); i++)
3588     if (polygon_info[i] != (PolygonInfo *) NULL)
3589       polygon_info[i]=DestroyPolygonInfo(polygon_info[i]);
3590   polygon_info=(PolygonInfo **) RelinquishAlignedMemory(polygon_info);
3591   return(polygon_info);
3592 }
3593
3594 static PolygonInfo **AcquirePolygonThreadSet(const DrawInfo *draw_info,
3595   const PrimitiveInfo *primitive_info)
3596 {
3597   PathInfo
3598     *restrict path_info;
3599
3600   register ssize_t
3601     i;
3602
3603   PolygonInfo
3604     **polygon_info;
3605
3606   size_t
3607     number_threads;
3608
3609   number_threads=GetOpenMPMaximumThreads();
3610   polygon_info=(PolygonInfo **) AcquireAlignedMemory(number_threads,
3611     sizeof(*polygon_info));
3612   if (polygon_info == (PolygonInfo **) NULL)
3613     return((PolygonInfo **) NULL);
3614   (void) ResetMagickMemory(polygon_info,0,GetOpenMPMaximumThreads()*
3615     sizeof(*polygon_info));
3616   path_info=ConvertPrimitiveToPath(draw_info,primitive_info);
3617   if (path_info == (PathInfo *) NULL)
3618     return(DestroyPolygonThreadSet(polygon_info));
3619   for (i=0; i < (ssize_t) number_threads; i++)
3620   {
3621     polygon_info[i]=ConvertPathToPolygon(draw_info,path_info);
3622     if (polygon_info[i] == (PolygonInfo *) NULL)
3623       return(DestroyPolygonThreadSet(polygon_info));
3624   }
3625   path_info=(PathInfo *) RelinquishMagickMemory(path_info);
3626   return(polygon_info);
3627 }
3628
3629 static MagickRealType GetPixelOpacity(PolygonInfo *polygon_info,
3630   const MagickRealType mid,const MagickBooleanType fill,
3631   const FillRule fill_rule,const double x,const double y,
3632   MagickRealType *stroke_opacity)
3633 {
3634   MagickRealType
3635     alpha,
3636     beta,
3637     distance,
3638     subpath_opacity;
3639
3640   PointInfo
3641     delta;
3642
3643   register EdgeInfo
3644     *p;
3645
3646   register const PointInfo
3647     *q;
3648
3649   register ssize_t
3650     i;
3651
3652   ssize_t
3653     j,
3654     winding_number;
3655
3656   /*
3657     Compute fill & stroke opacity for this (x,y) point.
3658   */
3659   *stroke_opacity=0.0;
3660   subpath_opacity=0.0;
3661   p=polygon_info->edges;
3662   for (j=0; j < (ssize_t) polygon_info->number_edges; j++, p++)
3663   {
3664     if (y <= (p->bounds.y1-mid-0.5))
3665       break;
3666     if (y > (p->bounds.y2+mid+0.5))
3667       {
3668         (void) DestroyEdge(polygon_info,(size_t) j);
3669         continue;
3670       }
3671     if ((x <= (p->bounds.x1-mid-0.5)) || (x > (p->bounds.x2+mid+0.5)))
3672       continue;
3673     i=(ssize_t) MagickMax((double) p->highwater,1.0);
3674     for ( ; i < (ssize_t) p->number_points; i++)
3675     {
3676       if (y <= (p->points[i-1].y-mid-0.5))
3677         break;
3678       if (y > (p->points[i].y+mid+0.5))
3679         continue;
3680       if (p->scanline != y)
3681         {
3682           p->scanline=y;
3683           p->highwater=(size_t) i;
3684         }
3685       /*
3686         Compute distance between a point and an edge.
3687       */
3688       q=p->points+i-1;
3689       delta.x=(q+1)->x-q->x;
3690       delta.y=(q+1)->y-q->y;
3691       beta=delta.x*(x-q->x)+delta.y*(y-q->y);
3692       if (beta < 0.0)
3693         {
3694           delta.x=x-q->x;
3695           delta.y=y-q->y;
3696           distance=delta.x*delta.x+delta.y*delta.y;
3697         }
3698       else
3699         {
3700           alpha=delta.x*delta.x+delta.y*delta.y;
3701           if (beta > alpha)
3702             {
3703               delta.x=x-(q+1)->x;
3704               delta.y=y-(q+1)->y;
3705               distance=delta.x*delta.x+delta.y*delta.y;
3706             }
3707           else
3708             {
3709               alpha=1.0/alpha;
3710               beta=delta.x*(y-q->y)-delta.y*(x-q->x);
3711               distance=alpha*beta*beta;
3712             }
3713         }
3714       /*
3715         Compute stroke & subpath opacity.
3716       */
3717       beta=0.0;
3718       if (p->ghostline == MagickFalse)
3719         {
3720           alpha=mid+0.5;
3721           if ((*stroke_opacity < 1.0) &&
3722               (distance <= ((alpha+0.25)*(alpha+0.25))))
3723             {
3724               alpha=mid-0.5;
3725               if (distance <= ((alpha+0.25)*(alpha+0.25)))
3726                 *stroke_opacity=1.0;
3727               else
3728                 {
3729                   beta=1.0;
3730                   if (distance != 1.0)
3731                     beta=sqrt((double) distance);
3732                   alpha=beta-mid-0.5;
3733                   if (*stroke_opacity < ((alpha-0.25)*(alpha-0.25)))
3734                     *stroke_opacity=(alpha-0.25)*(alpha-0.25);
3735                 }
3736             }
3737         }
3738       if ((fill == MagickFalse) || (distance > 1.0) || (subpath_opacity >= 1.0))
3739         continue;
3740       if (distance <= 0.0)
3741         {
3742           subpath_opacity=1.0;
3743           continue;
3744         }
3745       if (distance > 1.0)
3746         continue;
3747       if (beta == 0.0)
3748         {
3749           beta=1.0;
3750           if (distance != 1.0)
3751             beta=sqrt(distance);
3752         }
3753       alpha=beta-1.0;
3754       if (subpath_opacity < (alpha*alpha))
3755         subpath_opacity=alpha*alpha;
3756     }
3757   }
3758   /*
3759     Compute fill opacity.
3760   */
3761   if (fill == MagickFalse)
3762     return(0.0);
3763   if (subpath_opacity >= 1.0)
3764     return(1.0);
3765   /*
3766     Determine winding number.
3767   */
3768   winding_number=0;
3769   p=polygon_info->edges;
3770   for (j=0; j < (ssize_t) polygon_info->number_edges; j++, p++)
3771   {
3772     if (y <= p->bounds.y1)
3773       break;
3774     if ((y > p->bounds.y2) || (x <= p->bounds.x1))
3775       continue;
3776     if (x > p->bounds.x2)
3777       {
3778         winding_number+=p->direction ? 1 : -1;
3779         continue;
3780       }
3781     i=(ssize_t) MagickMax((double) p->highwater,1.0);
3782     for ( ; i < (ssize_t) p->number_points; i++)
3783       if (y <= p->points[i].y)
3784         break;
3785     q=p->points+i-1;
3786     if ((((q+1)->x-q->x)*(y-q->y)) <= (((q+1)->y-q->y)*(x-q->x)))
3787       winding_number+=p->direction ? 1 : -1;
3788   }
3789   if (fill_rule != NonZeroRule)
3790     {
3791       if ((MagickAbsoluteValue(winding_number) & 0x01) != 0)
3792         return(1.0);
3793     }
3794   else
3795     if (MagickAbsoluteValue(winding_number) != 0)
3796       return(1.0);
3797   return(subpath_opacity);
3798 }
3799
3800 static MagickBooleanType DrawPolygonPrimitive(Image *image,
3801   const DrawInfo *draw_info,const PrimitiveInfo *primitive_info)
3802 {
3803   CacheView
3804     *image_view;
3805
3806   ExceptionInfo
3807     *exception;
3808
3809   ssize_t
3810     start,
3811     stop,
3812     y;
3813
3814   MagickBooleanType
3815     fill,
3816     status;
3817
3818   MagickRealType
3819     mid;
3820
3821   PolygonInfo
3822     **restrict polygon_info;
3823
3824   register EdgeInfo
3825     *p;
3826
3827   register ssize_t
3828     i;
3829
3830   SegmentInfo
3831     bounds;
3832
3833   /*
3834     Compute bounding box.
3835   */
3836   assert(image != (Image *) NULL);
3837   assert(image->signature == MagickSignature);
3838   if (image->debug != MagickFalse)
3839     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
3840   assert(draw_info != (DrawInfo *) NULL);
3841   assert(draw_info->signature == MagickSignature);
3842   assert(primitive_info != (PrimitiveInfo *) NULL);
3843   if (primitive_info->coordinates == 0)
3844     return(MagickTrue);
3845   polygon_info=AcquirePolygonThreadSet(draw_info,primitive_info);
3846   if (polygon_info == (PolygonInfo **) NULL)
3847     return(MagickFalse);
3848   if (0)
3849     DrawBoundingRectangles(image,draw_info,polygon_info[0]);
3850   if (image->debug != MagickFalse)
3851     (void) LogMagickEvent(DrawEvent,GetMagickModule(),"    begin draw-polygon");
3852   fill=(primitive_info->method == FillToBorderMethod) ||
3853     (primitive_info->method == FloodfillMethod) ? MagickTrue : MagickFalse;
3854   mid=ExpandAffine(&draw_info->affine)*draw_info->stroke_width/2.0;
3855   bounds=polygon_info[0]->edges[0].bounds;
3856   for (i=1; i < (ssize_t) polygon_info[0]->number_edges; i++)
3857   {
3858     p=polygon_info[0]->edges+i;
3859     if (p->bounds.x1 < bounds.x1)
3860       bounds.x1=p->bounds.x1;
3861     if (p->bounds.y1 < bounds.y1)
3862       bounds.y1=p->bounds.y1;
3863     if (p->bounds.x2 > bounds.x2)
3864       bounds.x2=p->bounds.x2;
3865     if (p->bounds.y2 > bounds.y2)
3866       bounds.y2=p->bounds.y2;
3867   }
3868   bounds.x1-=(mid+1.0);
3869   bounds.x1=bounds.x1 < 0.0 ? 0.0 : (size_t) ceil(bounds.x1-0.5) >=
3870     image->columns ? (double) image->columns-1.0 : bounds.x1;
3871   bounds.y1-=(mid+1.0);
3872   bounds.y1=bounds.y1 < 0.0 ? 0.0 : (size_t) ceil(bounds.y1-0.5) >=
3873     image->rows ? (double) image->rows-1.0 : bounds.y1;
3874   bounds.x2+=(mid+1.0);
3875   bounds.x2=bounds.x2 < 0.0 ? 0.0 : (size_t) floor(bounds.x2+0.5) >=
3876     image->columns ? (double) image->columns-1.0 : bounds.x2;
3877   bounds.y2+=(mid+1.0);
3878   bounds.y2=bounds.y2 < 0.0 ? 0.0 : (size_t) floor(bounds.y2+0.5) >=
3879     image->rows ? (double) image->rows-1.0 : bounds.y2;
3880   status=MagickTrue;
3881   exception=(&image->exception);
3882   start=(ssize_t) ceil(bounds.x1-0.5);
3883   stop=(ssize_t) floor(bounds.x2+0.5);
3884   image_view=AcquireCacheView(image);
3885   if (primitive_info->coordinates == 1)
3886     {
3887       /*
3888         Draw point.
3889       */
3890 #if defined(MAGICKCORE_OPENMP_SUPPORT)
3891   #pragma omp parallel for schedule(dynamic,4) shared(status)
3892 #endif
3893       for (y=(ssize_t) ceil(bounds.y1-0.5); y <= (ssize_t) floor(bounds.y2+0.5); y++)
3894       {
3895         MagickBooleanType
3896           sync;
3897
3898         register ssize_t
3899           x;
3900
3901         register PixelPacket
3902           *restrict q;
3903
3904         if (status == MagickFalse)
3905           continue;
3906         x=start;
3907         q=GetCacheViewAuthenticPixels(image_view,x,y,(size_t) (stop-x+1),
3908           1,exception);
3909         if (q == (PixelPacket *) NULL)
3910           {
3911             status=MagickFalse;
3912             continue;
3913           }
3914         for ( ; x <= stop; x++)
3915         {
3916           if ((x == (ssize_t) ceil(primitive_info->point.x-0.5)) &&
3917               (y == (ssize_t) ceil(primitive_info->point.y-0.5)))
3918             (void) GetStrokeColor(draw_info,x,y,q);
3919           q++;
3920         }
3921         sync=SyncCacheViewAuthenticPixels(image_view,exception);
3922         if (sync == MagickFalse)
3923           status=MagickFalse;
3924       }
3925       image_view=DestroyCacheView(image_view);
3926       polygon_info=DestroyPolygonThreadSet(polygon_info);
3927       if (image->debug != MagickFalse)
3928         (void) LogMagickEvent(DrawEvent,GetMagickModule(),
3929           "    end draw-polygon");
3930       return(status);
3931     }
3932   /*
3933     Draw polygon or line.
3934   */
3935   if (image->matte == MagickFalse)
3936     (void) SetImageAlphaChannel(image,OpaqueAlphaChannel);
3937 #if defined(MAGICKCORE_OPENMP_SUPPORT)
3938   #pragma omp parallel for schedule(dynamic,4) shared(status)
3939 #endif
3940   for (y=(ssize_t) ceil(bounds.y1-0.5); y <= (ssize_t) floor(bounds.y2+0.5); y++)
3941   {
3942     MagickRealType
3943       fill_opacity,
3944       stroke_opacity;
3945
3946     PixelPacket
3947       fill_color,
3948       stroke_color;
3949
3950     register ssize_t
3951       id,
3952       x;
3953
3954     register PixelPacket
3955       *restrict q;
3956
3957     if (status == MagickFalse)
3958       continue;
3959     q=GetCacheViewAuthenticPixels(image_view,start,y,(size_t) (stop-
3960       start+1),1,exception);
3961     if (q == (PixelPacket *) NULL)
3962       {
3963         status=MagickFalse;
3964         continue;
3965       }
3966     id=GetOpenMPThreadId();
3967     for (x=start; x <= stop; x++)
3968     {
3969       /*
3970         Fill and/or stroke.
3971       */
3972       fill_opacity=GetPixelOpacity(polygon_info[id],mid,fill,
3973         draw_info->fill_rule,(double) x,(double) y,&stroke_opacity);
3974       if (draw_info->stroke_antialias == MagickFalse)
3975         {
3976           fill_opacity=fill_opacity > 0.25 ? 1.0 : 0.0;
3977           stroke_opacity=stroke_opacity > 0.25 ? 1.0 : 0.0;
3978         }
3979       (void) GetFillColor(draw_info,x,y,&fill_color);
3980       fill_opacity=(MagickRealType) (QuantumRange-fill_opacity*(QuantumRange-
3981         fill_color.opacity));
3982       MagickCompositeOver(&fill_color,fill_opacity,q,(MagickRealType)
3983         q->opacity,q);
3984       (void) GetStrokeColor(draw_info,x,y,&stroke_color);
3985       stroke_opacity=(MagickRealType) (QuantumRange-stroke_opacity*
3986         (QuantumRange-stroke_color.opacity));
3987       MagickCompositeOver(&stroke_color,stroke_opacity,q,(MagickRealType)
3988         q->opacity,q);
3989       q++;
3990     }
3991     if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
3992       status=MagickFalse;
3993   }
3994   image_view=DestroyCacheView(image_view);
3995   polygon_info=DestroyPolygonThreadSet(polygon_info);
3996   if (image->debug != MagickFalse)
3997     (void) LogMagickEvent(DrawEvent,GetMagickModule(),"    end draw-polygon");
3998   return(status);
3999 }
4000 \f
4001 /*
4002 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
4003 %                                                                             %
4004 %                                                                             %
4005 %                                                                             %
4006 %   D r a w P r i m i t i v e                                                 %
4007 %                                                                             %
4008 %                                                                             %
4009 %                                                                             %
4010 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
4011 %
4012 %  DrawPrimitive() draws a primitive (line, rectangle, ellipse) on the image.
4013 %
4014 %  The format of the DrawPrimitive method is:
4015 %
4016 %      MagickBooleanType DrawPrimitive(Image *image,const DrawInfo *draw_info,
4017 %        PrimitiveInfo *primitive_info)
4018 %
4019 %  A description of each parameter follows:
4020 %
4021 %    o image: the image.
4022 %
4023 %    o draw_info: the draw info.
4024 %
4025 %    o primitive_info: Specifies a pointer to a PrimitiveInfo structure.
4026 %
4027 */
4028
4029 static void LogPrimitiveInfo(const PrimitiveInfo *primitive_info)
4030 {
4031   const char
4032     *methods[] =
4033     {
4034       "point",
4035       "replace",
4036       "floodfill",
4037       "filltoborder",
4038       "reset",
4039       "?"
4040     };
4041
4042   ssize_t
4043     coordinates,
4044     y;
4045
4046   PointInfo
4047     p,
4048     q,
4049     point;
4050
4051   register ssize_t
4052     i,
4053     x;
4054
4055   x=(ssize_t) ceil(primitive_info->point.x-0.5);
4056   y=(ssize_t) ceil(primitive_info->point.y-0.5);
4057   switch (primitive_info->primitive)
4058   {
4059     case PointPrimitive:
4060     {
4061       (void) LogMagickEvent(DrawEvent,GetMagickModule(),
4062         "PointPrimitive %.20g,%.20g %s",(double) x,(double) y,
4063         methods[primitive_info->method]);
4064       return;
4065     }
4066     case ColorPrimitive:
4067     {
4068       (void) LogMagickEvent(DrawEvent,GetMagickModule(),
4069         "ColorPrimitive %.20g,%.20g %s",(double) x,(double) y,
4070         methods[primitive_info->method]);
4071       return;
4072     }
4073     case MattePrimitive:
4074     {
4075       (void) LogMagickEvent(DrawEvent,GetMagickModule(),
4076         "MattePrimitive %.20g,%.20g %s",(double) x,(double) y,
4077         methods[primitive_info->method]);
4078       return;
4079     }
4080     case TextPrimitive:
4081     {
4082       (void) LogMagickEvent(DrawEvent,GetMagickModule(),
4083         "TextPrimitive %.20g,%.20g",(double) x,(double) y);
4084       return;
4085     }
4086     case ImagePrimitive:
4087     {
4088       (void) LogMagickEvent(DrawEvent,GetMagickModule(),
4089         "ImagePrimitive %.20g,%.20g",(double) x,(double) y);
4090       return;
4091     }
4092     default:
4093       break;
4094   }
4095   coordinates=0;
4096   p=primitive_info[0].point;
4097   q.x=(-1.0);
4098   q.y=(-1.0);
4099   for (i=0; primitive_info[i].primitive != UndefinedPrimitive; i++)
4100   {
4101     point=primitive_info[i].point;
4102     if (coordinates <= 0)
4103       {
4104         coordinates=(ssize_t) primitive_info[i].coordinates;
4105         (void) LogMagickEvent(DrawEvent,GetMagickModule(),
4106           "    begin open (%.20g)",(double) coordinates);
4107         p=point;
4108       }
4109     point=primitive_info[i].point;
4110     if ((fabs(q.x-point.x) > MagickEpsilon) ||
4111         (fabs(q.y-point.y) > MagickEpsilon))
4112       (void) LogMagickEvent(DrawEvent,GetMagickModule(),
4113         "      %.20g: %.18g,%.18g",(double) coordinates,point.x,point.y);
4114     else
4115       (void) LogMagickEvent(DrawEvent,GetMagickModule(),
4116         "      %.20g: %g,%g (duplicate)",(double) coordinates,point.x,point.y);
4117     q=point;
4118     coordinates--;
4119     if (coordinates > 0)
4120       continue;
4121     if ((fabs(p.x-point.x) > MagickEpsilon) ||
4122         (fabs(p.y-point.y) > MagickEpsilon))
4123       (void) LogMagickEvent(DrawEvent,GetMagickModule(),"    end last (%.20g)",
4124         (double) coordinates);
4125     else
4126       (void) LogMagickEvent(DrawEvent,GetMagickModule(),"    end open (%.20g)",
4127         (double) coordinates);
4128   }
4129 }
4130
4131 MagickExport MagickBooleanType DrawPrimitive(Image *image,
4132   const DrawInfo *draw_info,const PrimitiveInfo *primitive_info)
4133 {
4134   CacheView
4135     *image_view;
4136
4137   ExceptionInfo
4138     *exception;
4139
4140   ssize_t
4141     y;
4142
4143   MagickStatusType
4144     status;
4145
4146   register ssize_t
4147     i,
4148     x;
4149
4150   if (image->debug != MagickFalse)
4151     {
4152       (void) LogMagickEvent(DrawEvent,GetMagickModule(),
4153         "  begin draw-primitive");
4154       (void) LogMagickEvent(DrawEvent,GetMagickModule(),
4155         "    affine: %g,%g,%g,%g,%g,%g",draw_info->affine.sx,
4156         draw_info->affine.rx,draw_info->affine.ry,draw_info->affine.sy,
4157         draw_info->affine.tx,draw_info->affine.ty);
4158     }
4159   status=MagickTrue;
4160   exception=(&image->exception);
4161   x=(ssize_t) ceil(primitive_info->point.x-0.5);
4162   y=(ssize_t) ceil(primitive_info->point.y-0.5);
4163   image_view=AcquireCacheView(image);
4164   switch (primitive_info->primitive)
4165   {
4166     case PointPrimitive:
4167     {
4168       PixelPacket
4169         fill_color;
4170
4171       PixelPacket
4172         *q;
4173
4174       if ((y < 0) || (y >= (ssize_t) image->rows))
4175         break;
4176       if ((x < 0) || (x >= (ssize_t) image->columns))
4177         break;
4178       q=GetCacheViewAuthenticPixels(image_view,x,y,1,1,exception);
4179       if (q == (PixelPacket *) NULL)
4180         break;
4181       (void) GetFillColor(draw_info,x,y,&fill_color);
4182       MagickCompositeOver(&fill_color,(MagickRealType) fill_color.opacity,q,
4183         (MagickRealType) q->opacity,q);
4184       (void) SyncCacheViewAuthenticPixels(image_view,exception);
4185       break;
4186     }
4187     case ColorPrimitive:
4188     {
4189       switch (primitive_info->method)
4190       {
4191         case PointMethod:
4192         default:
4193         {
4194           PixelPacket
4195             *q;
4196
4197           q=GetCacheViewAuthenticPixels(image_view,x,y,1,1,exception);
4198           if (q == (PixelPacket *) NULL)
4199             break;
4200           (void) GetFillColor(draw_info,x,y,q);
4201           (void) SyncCacheViewAuthenticPixels(image_view,exception);
4202           break;
4203         }
4204         case ReplaceMethod:
4205         {
4206           MagickBooleanType
4207             sync;
4208
4209           PixelPacket
4210             target;
4211
4212           (void) GetOneCacheViewVirtualPixel(image_view,x,y,&target,exception);
4213           for (y=0; y < (ssize_t) image->rows; y++)
4214           {
4215             register PixelPacket
4216               *restrict q;
4217
4218             q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
4219               exception);
4220             if (q == (PixelPacket *) NULL)
4221               break;
4222             for (x=0; x < (ssize_t) image->columns; x++)
4223             {
4224               if (IsColorSimilar(image,q,&target) == MagickFalse)
4225                 {
4226                   q++;
4227                   continue;
4228                 }
4229               (void) GetFillColor(draw_info,x,y,q);
4230               q++;
4231             }
4232             sync=SyncCacheViewAuthenticPixels(image_view,exception);
4233             if (sync == MagickFalse)
4234               break;
4235           }
4236           break;
4237         }
4238         case FloodfillMethod:
4239         case FillToBorderMethod:
4240         {
4241           MagickPixelPacket
4242             target;
4243
4244           (void) GetOneVirtualMagickPixel(image,x,y,&target,exception);
4245           if (primitive_info->method == FillToBorderMethod)
4246             {
4247               target.red=(MagickRealType) draw_info->border_color.red;
4248               target.green=(MagickRealType) draw_info->border_color.green;
4249               target.blue=(MagickRealType) draw_info->border_color.blue;
4250             }
4251           (void) FloodfillPaintImage(image,DefaultChannels,draw_info,&target,x,
4252             y,primitive_info->method == FloodfillMethod ? MagickFalse :
4253             MagickTrue);
4254           break;
4255         }
4256         case ResetMethod:
4257         {
4258           MagickBooleanType
4259             sync;
4260
4261           for (y=0; y < (ssize_t) image->rows; y++)
4262           {
4263             register ssize_t
4264               x;
4265
4266             register PixelPacket
4267               *restrict q;
4268
4269             q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
4270               exception);
4271             if (q == (PixelPacket *) NULL)
4272               break;
4273             for (x=0; x < (ssize_t) image->columns; x++)
4274             {
4275               (void) GetFillColor(draw_info,x,y,q);
4276               q++;
4277             }
4278             sync=SyncCacheViewAuthenticPixels(image_view,exception);
4279             if (sync == MagickFalse)
4280               break;
4281           }
4282           break;
4283         }
4284       }
4285       break;
4286     }
4287     case MattePrimitive:
4288     {
4289       if (image->matte == MagickFalse)
4290         (void) SetImageAlphaChannel(image,OpaqueAlphaChannel);
4291       switch (primitive_info->method)
4292       {
4293         case PointMethod:
4294         default:
4295         {
4296           PixelPacket
4297             pixel;
4298
4299           PixelPacket
4300             *q;
4301
4302           q=GetCacheViewAuthenticPixels(image_view,x,y,1,1,exception);
4303           if (q == (PixelPacket *) NULL)
4304             break;
4305           (void) GetFillColor(draw_info,x,y,&pixel);
4306           q->opacity=pixel.opacity;
4307           (void) SyncCacheViewAuthenticPixels(image_view,exception);
4308           break;
4309         }
4310         case ReplaceMethod:
4311         {
4312           MagickBooleanType
4313             sync;
4314
4315           PixelPacket
4316             pixel,
4317             target;
4318
4319           (void) GetOneCacheViewVirtualPixel(image_view,x,y,&target,exception);
4320           for (y=0; y < (ssize_t) image->rows; y++)
4321           {
4322             register ssize_t
4323               x;
4324
4325             register PixelPacket
4326               *restrict q;
4327
4328             q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
4329               exception);
4330             if (q == (PixelPacket *) NULL)
4331               break;
4332             for (x=0; x < (ssize_t) image->columns; x++)
4333             {
4334               if (IsColorSimilar(image,q,&target) == MagickFalse)
4335                 {
4336                   q++;
4337                   continue;
4338                 }
4339               (void) GetFillColor(draw_info,x,y,&pixel);
4340               q->opacity=pixel.opacity;
4341               q++;
4342             }
4343             sync=SyncCacheViewAuthenticPixels(image_view,exception);
4344             if (sync == MagickFalse)
4345               break;
4346           }
4347           break;
4348         }
4349         case FloodfillMethod:
4350         case FillToBorderMethod:
4351         {
4352           MagickPixelPacket
4353             target;
4354
4355           (void) GetOneVirtualMagickPixel(image,x,y,&target,exception);
4356           if (primitive_info->method == FillToBorderMethod)
4357             {
4358               target.red=(MagickRealType) draw_info->border_color.red;
4359               target.green=(MagickRealType) draw_info->border_color.green;
4360               target.blue=(MagickRealType) draw_info->border_color.blue;
4361             }
4362           (void) FloodfillPaintImage(image,OpacityChannel,draw_info,&target,x,y,
4363             primitive_info->method == FloodfillMethod ? MagickFalse :
4364             MagickTrue);
4365           break;
4366         }
4367         case ResetMethod:
4368         {
4369           MagickBooleanType
4370             sync;
4371
4372           PixelPacket
4373             pixel;
4374
4375           for (y=0; y < (ssize_t) image->rows; y++)
4376           {
4377             register ssize_t
4378               x;
4379
4380             register PixelPacket
4381               *restrict q;
4382
4383             q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
4384               exception);
4385             if (q == (PixelPacket *) NULL)
4386               break;
4387             for (x=0; x < (ssize_t) image->columns; x++)
4388             {
4389               (void) GetFillColor(draw_info,x,y,&pixel);
4390               q->opacity=pixel.opacity;
4391               q++;
4392             }
4393             sync=SyncCacheViewAuthenticPixels(image_view,exception);
4394             if (sync == MagickFalse)
4395               break;
4396           }
4397           break;
4398         }
4399       }
4400       break;
4401     }
4402     case TextPrimitive:
4403     {
4404       char
4405         geometry[MaxTextExtent];
4406
4407       DrawInfo
4408         *clone_info;
4409
4410       if (primitive_info->text == (char *) NULL)
4411         break;
4412       clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
4413       (void) CloneString(&clone_info->text,primitive_info->text);
4414       (void) FormatMagickString(geometry,MaxTextExtent,"%+f%+f",
4415         primitive_info->point.x,primitive_info->point.y);
4416       (void) CloneString(&clone_info->geometry,geometry);
4417       status=AnnotateImage(image,clone_info);
4418       clone_info=DestroyDrawInfo(clone_info);
4419       break;
4420     }
4421     case ImagePrimitive:
4422     {
4423       AffineMatrix
4424         affine;
4425
4426       char
4427         composite_geometry[MaxTextExtent];
4428
4429       Image
4430         *composite_image;
4431
4432       ImageInfo
4433         *clone_info;
4434
4435       ssize_t
4436         x1,
4437         y1;
4438
4439       RectangleInfo
4440         geometry;
4441
4442       if (primitive_info->text == (char *) NULL)
4443         break;
4444       clone_info=AcquireImageInfo();
4445       if (LocaleNCompare(primitive_info->text,"data:",5) == 0)
4446         composite_image=ReadInlineImage(clone_info,primitive_info->text,
4447           &image->exception);
4448       else
4449         {
4450           (void) CopyMagickString(clone_info->filename,primitive_info->text,
4451             MaxTextExtent);
4452           composite_image=ReadImage(clone_info,&image->exception);
4453         }
4454       clone_info=DestroyImageInfo(clone_info);
4455       if (composite_image == (Image *) NULL)
4456         break;
4457       (void) SetImageProgressMonitor(composite_image,(MagickProgressMonitor)
4458         NULL,(void *) NULL);
4459       x1=(ssize_t) ceil(primitive_info[1].point.x-0.5);
4460       y1=(ssize_t) ceil(primitive_info[1].point.y-0.5);
4461       if (((x1 != 0L) && (x1 != (ssize_t) composite_image->columns)) ||
4462           ((y1 != 0L) && (y1 != (ssize_t) composite_image->rows)))
4463         {
4464           char
4465             geometry[MaxTextExtent];
4466
4467           /*
4468             Resize image.
4469           */
4470           (void) FormatMagickString(geometry,MaxTextExtent,"%gx%g!",
4471             primitive_info[1].point.x,primitive_info[1].point.y);
4472           composite_image->filter=image->filter;
4473           (void) TransformImage(&composite_image,(char *) NULL,geometry);
4474         }
4475       if (composite_image->matte == MagickFalse)
4476         (void) SetImageAlphaChannel(composite_image,OpaqueAlphaChannel);
4477       if (draw_info->opacity != OpaqueOpacity)
4478         (void) SetImageOpacity(composite_image,draw_info->opacity);
4479       SetGeometry(image,&geometry);
4480       image->gravity=draw_info->gravity;
4481       geometry.x=x;
4482       geometry.y=y;
4483       (void) FormatMagickString(composite_geometry,MaxTextExtent,
4484         "%.20gx%.20g%+.20gx%+.20g",(double) composite_image->columns,(double)
4485         composite_image->rows,(double) geometry.x,(double) geometry.y);
4486       (void) ParseGravityGeometry(image,composite_geometry,&geometry,
4487         &image->exception);
4488       affine=draw_info->affine;
4489       affine.tx=(double) geometry.x;
4490       affine.ty=(double) geometry.y;
4491       composite_image->interpolate=image->interpolate;
4492       if (draw_info->compose == OverCompositeOp)
4493         (void) DrawAffineImage(image,composite_image,&affine);
4494       else
4495         (void) CompositeImage(image,draw_info->compose,composite_image,
4496           geometry.x,geometry.y);
4497       composite_image=DestroyImage(composite_image);
4498       break;
4499     }
4500     default:
4501     {
4502       MagickRealType
4503         mid,
4504         scale;
4505
4506       DrawInfo
4507         *clone_info;
4508
4509       if (IsEventLogging() != MagickFalse)
4510         LogPrimitiveInfo(primitive_info);
4511       scale=ExpandAffine(&draw_info->affine);
4512       if ((draw_info->dash_pattern != (double *) NULL) &&
4513           (draw_info->dash_pattern[0] != 0.0) &&
4514           ((scale*draw_info->stroke_width) > MagickEpsilon) &&
4515           (draw_info->stroke.opacity != (Quantum) TransparentOpacity))
4516         {
4517           /*
4518             Draw dash polygon.
4519           */
4520           clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
4521           clone_info->stroke_width=0.0;
4522           clone_info->stroke.opacity=(Quantum) TransparentOpacity;
4523           status=DrawPolygonPrimitive(image,clone_info,primitive_info);
4524           clone_info=DestroyDrawInfo(clone_info);
4525           (void) DrawDashPolygon(draw_info,primitive_info,image);
4526           break;
4527         }
4528       mid=ExpandAffine(&draw_info->affine)*draw_info->stroke_width/2.0;
4529       if ((mid > 1.0) &&
4530           (draw_info->stroke.opacity != (Quantum) TransparentOpacity))
4531         {
4532           MagickBooleanType
4533             closed_path;
4534
4535           /*
4536             Draw strokes while respecting line cap/join attributes.
4537           */
4538           for (i=0; primitive_info[i].primitive != UndefinedPrimitive; i++) ;
4539           closed_path=
4540             (primitive_info[i-1].point.x == primitive_info[0].point.x) &&
4541             (primitive_info[i-1].point.y == primitive_info[0].point.y) ?
4542             MagickTrue : MagickFalse;
4543           i=(ssize_t) primitive_info[0].coordinates;
4544           if ((((draw_info->linecap == RoundCap) ||
4545                 (closed_path != MagickFalse)) &&
4546                (draw_info->linejoin == RoundJoin)) ||
4547                (primitive_info[i].primitive != UndefinedPrimitive))
4548             {
4549               (void) DrawPolygonPrimitive(image,draw_info,primitive_info);
4550               break;
4551             }
4552           clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
4553           clone_info->stroke_width=0.0;
4554           clone_info->stroke.opacity=(Quantum) TransparentOpacity;
4555           status=DrawPolygonPrimitive(image,clone_info,primitive_info);
4556           clone_info=DestroyDrawInfo(clone_info);
4557           status|=DrawStrokePolygon(image,draw_info,primitive_info);
4558           break;
4559         }
4560       status=DrawPolygonPrimitive(image,draw_info,primitive_info);
4561       break;
4562     }
4563   }
4564   image_view=DestroyCacheView(image_view);
4565   if (image->debug != MagickFalse)
4566     (void) LogMagickEvent(DrawEvent,GetMagickModule(),"  end draw-primitive");
4567   return(status != 0 ? MagickTrue : MagickFalse);
4568 }
4569 \f
4570 /*
4571 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
4572 %                                                                             %
4573 %                                                                             %
4574 %                                                                             %
4575 +   D r a w S t r o k e P o l y g o n                                         %
4576 %                                                                             %
4577 %                                                                             %
4578 %                                                                             %
4579 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
4580 %
4581 %  DrawStrokePolygon() draws a stroked polygon (line, rectangle, ellipse) on
4582 %  the image while respecting the line cap and join attributes.
4583 %
4584 %  The format of the DrawStrokePolygon method is:
4585 %
4586 %      MagickBooleanType DrawStrokePolygon(Image *image,
4587 %        const DrawInfo *draw_info,const PrimitiveInfo *primitive_info)
4588 %
4589 %  A description of each parameter follows:
4590 %
4591 %    o image: the image.
4592 %
4593 %    o draw_info: the draw info.
4594 %
4595 %    o primitive_info: Specifies a pointer to a PrimitiveInfo structure.
4596 %
4597 %
4598 */
4599
4600 static void DrawRoundLinecap(Image *image,const DrawInfo *draw_info,
4601   const PrimitiveInfo *primitive_info)
4602 {
4603   PrimitiveInfo
4604     linecap[5];
4605
4606   register ssize_t
4607     i;
4608
4609   for (i=0; i < 4; i++)
4610     linecap[i]=(*primitive_info);
4611   linecap[0].coordinates=4;
4612   linecap[1].point.x+=(double) (10.0*MagickEpsilon);
4613   linecap[2].point.x+=(double) (10.0*MagickEpsilon);
4614   linecap[2].point.y+=(double) (10.0*MagickEpsilon);
4615   linecap[3].point.y+=(double) (10.0*MagickEpsilon);
4616   linecap[4].primitive=UndefinedPrimitive;
4617   (void) DrawPolygonPrimitive(image,draw_info,linecap);
4618 }
4619
4620 static MagickBooleanType DrawStrokePolygon(Image *image,
4621   const DrawInfo *draw_info,const PrimitiveInfo *primitive_info)
4622 {
4623   DrawInfo
4624     *clone_info;
4625
4626   MagickBooleanType
4627     closed_path,
4628     status;
4629
4630   PrimitiveInfo
4631     *stroke_polygon;
4632
4633   register const PrimitiveInfo
4634     *p,
4635     *q;
4636
4637   /*
4638     Draw stroked polygon.
4639   */
4640   if (image->debug != MagickFalse)
4641     (void) LogMagickEvent(DrawEvent,GetMagickModule(),
4642       "    begin draw-stroke-polygon");
4643   clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
4644   clone_info->fill=draw_info->stroke;
4645   clone_info->stroke.opacity=(Quantum) TransparentOpacity;
4646   clone_info->stroke_width=0.0;
4647   clone_info->fill_rule=NonZeroRule;
4648   status=MagickTrue;
4649   for (p=primitive_info; p->primitive != UndefinedPrimitive; p+=p->coordinates)
4650   {
4651     stroke_polygon=TraceStrokePolygon(draw_info,p);
4652     status=DrawPolygonPrimitive(image,clone_info,stroke_polygon);
4653     stroke_polygon=(PrimitiveInfo *) RelinquishMagickMemory(stroke_polygon);
4654     q=p+p->coordinates-1;
4655     closed_path=(q->point.x == p->point.x) && (q->point.y == p->point.y) ?
4656       MagickTrue : MagickFalse;
4657     if ((draw_info->linecap == RoundCap) && (closed_path == MagickFalse))
4658       {
4659         DrawRoundLinecap(image,draw_info,p);
4660         DrawRoundLinecap(image,draw_info,q);
4661       }
4662   }
4663   clone_info=DestroyDrawInfo(clone_info);
4664   if (image->debug != MagickFalse)
4665     (void) LogMagickEvent(DrawEvent,GetMagickModule(),
4666       "    end draw-stroke-polygon");
4667   return(status);
4668 }
4669 \f
4670 /*
4671 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
4672 %                                                                             %
4673 %                                                                             %
4674 %                                                                             %
4675 %   G e t A f f i n e M a t r i x                                             %
4676 %                                                                             %
4677 %                                                                             %
4678 %                                                                             %
4679 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
4680 %
4681 %  GetAffineMatrix() returns an AffineMatrix initialized to the identity
4682 %  matrix.
4683 %
4684 %  The format of the GetAffineMatrix method is:
4685 %
4686 %      void GetAffineMatrix(AffineMatrix *affine_matrix)
4687 %
4688 %  A description of each parameter follows:
4689 %
4690 %    o affine_matrix: the affine matrix.
4691 %
4692 */
4693 MagickExport void GetAffineMatrix(AffineMatrix *affine_matrix)
4694 {
4695   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
4696   assert(affine_matrix != (AffineMatrix *) NULL);
4697   (void) ResetMagickMemory(affine_matrix,0,sizeof(*affine_matrix));
4698   affine_matrix->sx=1.0;
4699   affine_matrix->sy=1.0;
4700 }
4701 \f
4702 /*
4703 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
4704 %                                                                             %
4705 %                                                                             %
4706 %                                                                             %
4707 +   G e t D r a w I n f o                                                     %
4708 %                                                                             %
4709 %                                                                             %
4710 %                                                                             %
4711 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
4712 %
4713 %  GetDrawInfo() initializes draw_info to default values.
4714 %
4715 %  The format of the GetDrawInfo method is:
4716 %
4717 %      void GetDrawInfo(const ImageInfo *image_info,DrawInfo *draw_info)
4718 %
4719 %  A description of each parameter follows:
4720 %
4721 %    o image_info: the image info..
4722 %
4723 %    o draw_info: the draw info.
4724 %
4725 */
4726 MagickExport void GetDrawInfo(const ImageInfo *image_info,DrawInfo *draw_info)
4727 {
4728   const char
4729     *option;
4730
4731   ExceptionInfo
4732     *exception;
4733
4734   ImageInfo
4735     *clone_info;
4736
4737   /*
4738     Initialize draw attributes.
4739   */
4740   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
4741   assert(draw_info != (DrawInfo *) NULL);
4742   (void) ResetMagickMemory(draw_info,0,sizeof(*draw_info));
4743   clone_info=CloneImageInfo(image_info);
4744   GetAffineMatrix(&draw_info->affine);
4745   exception=AcquireExceptionInfo();
4746   (void) QueryColorDatabase("#000F",&draw_info->fill,exception);
4747   (void) QueryColorDatabase("#FFF0",&draw_info->stroke,exception);
4748   draw_info->stroke_antialias=clone_info->antialias;
4749   draw_info->stroke_width=1.0;
4750   draw_info->opacity=OpaqueOpacity;
4751   draw_info->fill_rule=EvenOddRule;
4752   draw_info->linecap=ButtCap;
4753   draw_info->linejoin=MiterJoin;
4754   draw_info->miterlimit=10;
4755   draw_info->decorate=NoDecoration;
4756   if (clone_info->font != (char *) NULL)
4757     draw_info->font=AcquireString(clone_info->font);
4758   if (clone_info->density != (char *) NULL)
4759     draw_info->density=AcquireString(clone_info->density);
4760   draw_info->text_antialias=clone_info->antialias;
4761   draw_info->pointsize=12.0;
4762   if (clone_info->pointsize != 0.0)
4763     draw_info->pointsize=clone_info->pointsize;
4764   draw_info->undercolor.opacity=(Quantum) TransparentOpacity;
4765   draw_info->border_color=clone_info->border_color;
4766   draw_info->compose=OverCompositeOp;
4767   if (clone_info->server_name != (char *) NULL)
4768     draw_info->server_name=AcquireString(clone_info->server_name);
4769   draw_info->render=MagickTrue;
4770   draw_info->debug=IsEventLogging();
4771   option=GetImageOption(clone_info,"encoding");
4772   if (option != (const char *) NULL)
4773     (void) CloneString(&draw_info->encoding,option);
4774   option=GetImageOption(clone_info,"kerning");
4775   if (option != (const char *) NULL)
4776     draw_info->kerning=StringToDouble(option);
4777   option=GetImageOption(clone_info,"interline-spacing");
4778   if (option != (const char *) NULL)
4779     draw_info->interline_spacing=StringToDouble(option);
4780   draw_info->direction=UndefinedDirection;
4781   option=GetImageOption(clone_info,"interword-spacing");
4782   if (option != (const char *) NULL)
4783     draw_info->interword_spacing=StringToDouble(option);
4784   option=GetImageOption(clone_info,"direction");
4785   if (option != (const char *) NULL)
4786     draw_info->direction=(DirectionType) ParseMagickOption(
4787       MagickDirectionOptions,MagickFalse,option);
4788   option=GetImageOption(clone_info,"fill");
4789   if (option != (const char *) NULL)
4790     (void) QueryColorDatabase(option,&draw_info->fill,exception);
4791   option=GetImageOption(clone_info,"stroke");
4792   if (option != (const char *) NULL)
4793     (void) QueryColorDatabase(option,&draw_info->stroke,exception);
4794   option=GetImageOption(clone_info,"strokewidth");
4795   if (option != (const char *) NULL)
4796     draw_info->stroke_width=StringToDouble(option);
4797   option=GetImageOption(clone_info,"undercolor");
4798   if (option != (const char *) NULL)
4799     (void) QueryColorDatabase(option,&draw_info->undercolor,exception);
4800   option=GetImageOption(clone_info,"gravity");
4801   if (option != (const char *) NULL)
4802     draw_info->gravity=(GravityType) ParseMagickOption(MagickGravityOptions,
4803       MagickFalse,option);
4804   exception=DestroyExceptionInfo(exception);
4805   draw_info->signature=MagickSignature;
4806   clone_info=DestroyImageInfo(clone_info);
4807 }
4808 \f
4809 /*
4810 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
4811 %                                                                             %
4812 %                                                                             %
4813 %                                                                             %
4814 +   P e r m u t a t e                                                         %
4815 %                                                                             %
4816 %                                                                             %
4817 %                                                                             %
4818 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
4819 %
4820 %  Permutate() returns the permuation of the (n,k).
4821 %
4822 %  The format of the Permutate method is:
4823 %
4824 %      void Permutate(ssize_t n,ssize_t k)
4825 %
4826 %  A description of each parameter follows:
4827 %
4828 %    o n:
4829 %
4830 %    o k:
4831 %
4832 %
4833 */
4834 static inline MagickRealType Permutate(const ssize_t n,const ssize_t k)
4835 {
4836   MagickRealType
4837     r;
4838
4839   register ssize_t
4840     i;
4841
4842   r=1.0;
4843   for (i=k+1; i <= n; i++)
4844     r*=i;
4845   for (i=1; i <= (n-k); i++)
4846     r/=i;
4847   return(r);
4848 }
4849 \f
4850 /*
4851 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
4852 %                                                                             %
4853 %                                                                             %
4854 %                                                                             %
4855 +   T r a c e P r i m i t i v e                                               %
4856 %                                                                             %
4857 %                                                                             %
4858 %                                                                             %
4859 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
4860 %
4861 %  TracePrimitive is a collection of methods for generating graphic
4862 %  primitives such as arcs, ellipses, paths, etc.
4863 %
4864 */
4865
4866 static void TraceArc(PrimitiveInfo *primitive_info,const PointInfo start,
4867   const PointInfo end,const PointInfo degrees)
4868 {
4869   PointInfo
4870     center,
4871     radii;
4872
4873   center.x=0.5*(end.x+start.x);
4874   center.y=0.5*(end.y+start.y);
4875   radii.x=fabs(center.x-start.x);
4876   radii.y=fabs(center.y-start.y);
4877   TraceEllipse(primitive_info,center,radii,degrees);
4878 }
4879
4880 static void TraceArcPath(PrimitiveInfo *primitive_info,const PointInfo start,
4881   const PointInfo end,const PointInfo arc,const MagickRealType angle,
4882   const MagickBooleanType large_arc,const MagickBooleanType sweep)
4883 {
4884   MagickRealType
4885     alpha,
4886     beta,
4887     delta,
4888     factor,
4889     gamma,
4890     theta;
4891
4892   PointInfo
4893     center,
4894     points[3],
4895     radii;
4896
4897   register MagickRealType
4898     cosine,
4899     sine;
4900
4901   register PrimitiveInfo
4902     *p;
4903
4904   register ssize_t
4905     i;
4906
4907   size_t
4908     arc_segments;
4909
4910   if ((start.x == end.x) && (start.y == end.y))
4911     {
4912       TracePoint(primitive_info,end);
4913       return;
4914     }
4915   radii.x=fabs(arc.x);
4916   radii.y=fabs(arc.y);
4917   if ((radii.x == 0.0) || (radii.y == 0.0))
4918     {
4919       TraceLine(primitive_info,start,end);
4920       return;
4921     }
4922   cosine=cos(DegreesToRadians(fmod((double) angle,360.0)));
4923   sine=sin(DegreesToRadians(fmod((double) angle,360.0)));
4924   center.x=(double) (cosine*(end.x-start.x)/2+sine*(end.y-start.y)/2);
4925   center.y=(double) (cosine*(end.y-start.y)/2-sine*(end.x-start.x)/2);
4926   delta=(center.x*center.x)/(radii.x*radii.x)+(center.y*center.y)/
4927     (radii.y*radii.y);
4928   if (delta < MagickEpsilon)
4929     {
4930       TraceLine(primitive_info,start,end);
4931       return;
4932     }
4933   if (delta > 1.0)
4934     {
4935       radii.x*=sqrt((double) delta);
4936       radii.y*=sqrt((double) delta);
4937     }
4938   points[0].x=(double) (cosine*start.x/radii.x+sine*start.y/radii.x);
4939   points[0].y=(double) (cosine*start.y/radii.y-sine*start.x/radii.y);
4940   points[1].x=(double) (cosine*end.x/radii.x+sine*end.y/radii.x);
4941   points[1].y=(double) (cosine*end.y/radii.y-sine*end.x/radii.y);
4942   alpha=points[1].x-points[0].x;
4943   beta=points[1].y-points[0].y;
4944   factor=1.0/(alpha*alpha+beta*beta)-0.25;
4945   if (factor <= 0.0)
4946     factor=0.0;
4947   else
4948     {
4949       factor=sqrt((double) factor);
4950       if (sweep == large_arc)
4951         factor=(-factor);
4952     }
4953   center.x=(double) ((points[0].x+points[1].x)/2-factor*beta);
4954   center.y=(double) ((points[0].y+points[1].y)/2+factor*alpha);
4955   alpha=atan2(points[0].y-center.y,points[0].x-center.x);
4956   theta=atan2(points[1].y-center.y,points[1].x-center.x)-alpha;
4957   if ((theta < 0.0) && (sweep != MagickFalse))
4958     theta+=(MagickRealType) (2.0*MagickPI);
4959   else
4960     if ((theta > 0.0) && (sweep == MagickFalse))
4961       theta-=(MagickRealType) (2.0*MagickPI);
4962   arc_segments=(size_t) ceil(fabs((double) (theta/(0.5*MagickPI+
4963     MagickEpsilon)))-0.5);
4964   p=primitive_info;
4965   for (i=0; i < (ssize_t) arc_segments; i++)
4966   {
4967     beta=0.5*((alpha+(i+1)*theta/arc_segments)-(alpha+i*theta/arc_segments));
4968     gamma=(8.0/3.0)*sin(fmod((double) (0.5*beta),DegreesToRadians(360.0)))*
4969       sin(fmod((double) (0.5*beta),DegreesToRadians(360.0)))/
4970       sin(fmod((double) beta,DegreesToRadians(360.0)));
4971     points[0].x=(double) (center.x+cos(fmod((double) (alpha+(double) i*theta/
4972       arc_segments),DegreesToRadians(360.0)))-gamma*sin(fmod((double) (alpha+
4973       (double) i*theta/arc_segments),DegreesToRadians(360.0))));
4974     points[0].y=(double) (center.y+sin(fmod((double) (alpha+(double) i*theta/
4975       arc_segments),DegreesToRadians(360.0)))+gamma*cos(fmod((double) (alpha+
4976       (double) i*theta/arc_segments),DegreesToRadians(360.0))));
4977     points[2].x=(double) (center.x+cos(fmod((double) (alpha+(double) (i+1)*
4978       theta/arc_segments),DegreesToRadians(360.0))));
4979     points[2].y=(double) (center.y+sin(fmod((double) (alpha+(double) (i+1)*
4980       theta/arc_segments),DegreesToRadians(360.0))));
4981     points[1].x=(double) (points[2].x+gamma*sin(fmod((double) (alpha+(double)
4982       (i+1)*theta/arc_segments),DegreesToRadians(360.0))));
4983     points[1].y=(double) (points[2].y-gamma*cos(fmod((double) (alpha+(double)
4984       (i+1)*theta/arc_segments),DegreesToRadians(360.0))));
4985     p->point.x=(p == primitive_info) ? start.x : (p-1)->point.x;
4986     p->point.y=(p == primitive_info) ? start.y : (p-1)->point.y;
4987     (p+1)->point.x=(double) (cosine*radii.x*points[0].x-sine*radii.y*
4988       points[0].y);
4989     (p+1)->point.y=(double) (sine*radii.x*points[0].x+cosine*radii.y*
4990       points[0].y);
4991     (p+2)->point.x=(double) (cosine*radii.x*points[1].x-sine*radii.y*
4992       points[1].y);
4993     (p+2)->point.y=(double) (sine*radii.x*points[1].x+cosine*radii.y*
4994       points[1].y);
4995     (p+3)->point.x=(double) (cosine*radii.x*points[2].x-sine*radii.y*
4996       points[2].y);
4997     (p+3)->point.y=(double) (sine*radii.x*points[2].x+cosine*radii.y*
4998       points[2].y);
4999     if (i == (ssize_t) (arc_segments-1))
5000       (p+3)->point=end;
5001     TraceBezier(p,4);
5002     p+=p->coordinates;
5003   }
5004   primitive_info->coordinates=(size_t) (p-primitive_info);
5005   for (i=0; i < (ssize_t) primitive_info->coordinates; i++)
5006   {
5007     p->primitive=primitive_info->primitive;
5008     p--;
5009   }
5010 }
5011
5012 static void TraceBezier(PrimitiveInfo *primitive_info,
5013   const size_t number_coordinates)
5014 {
5015   MagickRealType
5016     alpha,
5017     *coefficients,
5018     weight;
5019
5020   PointInfo
5021     end,
5022     point,
5023     *points;
5024
5025   register ssize_t
5026     i,
5027     j;
5028
5029   register PrimitiveInfo
5030     *p;
5031
5032   size_t
5033     control_points,
5034     quantum;
5035
5036   /*
5037     Allocate coeficients.
5038   */
5039   quantum=number_coordinates;
5040   for (i=0; i < (ssize_t) number_coordinates; i++)
5041   {
5042     for (j=i+1; j < (ssize_t) number_coordinates; j++)
5043     {
5044       alpha=fabs(primitive_info[j].point.x-primitive_info[i].point.x);
5045       if (alpha > (MagickRealType) quantum)
5046         quantum=(size_t) alpha;
5047       alpha=fabs(primitive_info[j].point.y-primitive_info[i].point.y);
5048       if (alpha > (MagickRealType) quantum)
5049         quantum=(size_t) alpha;
5050     }
5051   }
5052   quantum=(size_t) MagickMin((double) quantum/number_coordinates,
5053     (double) BezierQuantum);
5054   control_points=quantum*number_coordinates;
5055   coefficients=(MagickRealType *) AcquireQuantumMemory((size_t)
5056     number_coordinates,sizeof(*coefficients));
5057   points=(PointInfo *) AcquireQuantumMemory((size_t) control_points,
5058     sizeof(*points));
5059   if ((coefficients == (MagickRealType *) NULL) ||
5060       (points == (PointInfo *) NULL))
5061     ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
5062   /*
5063     Compute bezier points.
5064   */
5065   end=primitive_info[number_coordinates-1].point;
5066   for (i=0; i < (ssize_t) number_coordinates; i++)
5067     coefficients[i]=Permutate((ssize_t) number_coordinates-1,i);
5068   weight=0.0;
5069   for (i=0; i < (ssize_t) control_points; i++)
5070   {
5071     p=primitive_info;
5072     point.x=0.0;
5073     point.y=0.0;
5074     alpha=pow((double) (1.0-weight),(double) number_coordinates-1.0);
5075     for (j=0; j < (ssize_t) number_coordinates; j++)
5076     {
5077       point.x+=alpha*coefficients[j]*p->point.x;
5078       point.y+=alpha*coefficients[j]*p->point.y;
5079       alpha*=weight/(1.0-weight);
5080       p++;
5081     }
5082     points[i]=point;
5083     weight+=1.0/control_points;
5084   }
5085   /*
5086     Bezier curves are just short segmented polys.
5087   */
5088   p=primitive_info;
5089   for (i=0; i < (ssize_t) control_points; i++)
5090   {
5091     TracePoint(p,points[i]);
5092     p+=p->coordinates;
5093   }
5094   TracePoint(p,end);
5095   p+=p->coordinates;
5096   primitive_info->coordinates=(size_t) (p-primitive_info);
5097   for (i=0; i < (ssize_t) primitive_info->coordinates; i++)
5098   {
5099     p->primitive=primitive_info->primitive;
5100     p--;
5101   }
5102   points=(PointInfo *) RelinquishMagickMemory(points);
5103   coefficients=(MagickRealType *) RelinquishMagickMemory(coefficients);
5104 }
5105
5106 static void TraceCircle(PrimitiveInfo *primitive_info,const PointInfo start,
5107   const PointInfo end)
5108 {
5109   MagickRealType
5110     alpha,
5111     beta,
5112     radius;
5113
5114   PointInfo
5115     offset,
5116     degrees;
5117
5118   alpha=end.x-start.x;
5119   beta=end.y-start.y;
5120   radius=hypot((double) alpha,(double) beta);
5121   offset.x=(double) radius;
5122   offset.y=(double) radius;
5123   degrees.x=0.0;
5124   degrees.y=360.0;
5125   TraceEllipse(primitive_info,start,offset,degrees);
5126 }
5127
5128 static void TraceEllipse(PrimitiveInfo *primitive_info,const PointInfo start,
5129   const PointInfo stop,const PointInfo degrees)
5130 {
5131   MagickRealType
5132     delta,
5133     step,
5134     y;
5135
5136   PointInfo
5137     angle,
5138     point;
5139
5140   register PrimitiveInfo
5141     *p;
5142
5143   register ssize_t
5144     i;
5145
5146   /*
5147     Ellipses are just short segmented polys.
5148   */
5149   if ((stop.x == 0.0) && (stop.y == 0.0))
5150     {
5151       TracePoint(primitive_info,start);
5152       return;
5153     }
5154   delta=2.0/MagickMax(stop.x,stop.y);
5155   step=(MagickRealType) (MagickPI/8.0);
5156   if ((delta >= 0.0) && (delta < (MagickPI/8.0)))
5157     step=MagickPI/(4*(MagickPI/delta/2+0.5));
5158   angle.x=DegreesToRadians(degrees.x);
5159   y=degrees.y;
5160   while (y < degrees.x)
5161     y+=360.0;
5162   angle.y=(double) (DegreesToRadians(y)-MagickEpsilon);
5163   for (p=primitive_info; angle.x < angle.y; angle.x+=step)
5164   {
5165     point.x=cos(fmod(angle.x,DegreesToRadians(360.0)))*stop.x+start.x;
5166     point.y=sin(fmod(angle.x,DegreesToRadians(360.0)))*stop.y+start.y;
5167     TracePoint(p,point);
5168     p+=p->coordinates;
5169   }
5170   point.x=cos(fmod(angle.y,DegreesToRadians(360.0)))*stop.x+start.x;
5171   point.y=sin(fmod(angle.y,DegreesToRadians(360.0)))*stop.y+start.y;
5172   TracePoint(p,point);
5173   p+=p->coordinates;
5174   primitive_info->coordinates=(size_t) (p-primitive_info);
5175   for (i=0; i < (ssize_t) primitive_info->coordinates; i++)
5176   {
5177     p->primitive=primitive_info->primitive;
5178     p--;
5179   }
5180 }
5181
5182 static void TraceLine(PrimitiveInfo *primitive_info,const PointInfo start,
5183   const PointInfo end)
5184 {
5185   TracePoint(primitive_info,start);
5186   if ((fabs(start.x-end.x) <= MagickEpsilon) &&
5187       (fabs(start.y-end.y) <= MagickEpsilon))
5188     {
5189       primitive_info->primitive=PointPrimitive;
5190       primitive_info->coordinates=1;
5191       return;
5192     }
5193   TracePoint(primitive_info+1,end);
5194   (primitive_info+1)->primitive=primitive_info->primitive;
5195   primitive_info->coordinates=2;
5196 }
5197
5198 static size_t TracePath(PrimitiveInfo *primitive_info,const char *path)
5199 {
5200   char
5201     token[MaxTextExtent];
5202
5203   const char
5204     *p;
5205
5206   int
5207     attribute,
5208     last_attribute;
5209
5210   MagickRealType
5211     x,
5212     y;
5213
5214   PointInfo
5215     end,
5216     points[4],
5217     point,
5218     start;
5219
5220   PrimitiveType
5221     primitive_type;
5222
5223   register PrimitiveInfo
5224     *q;
5225
5226   register ssize_t
5227     i;
5228
5229   size_t
5230     number_coordinates,
5231     z_count;
5232
5233   attribute=0;
5234   point.x=0.0;
5235   point.y=0.0;
5236   start.x=0.0;
5237   start.y=0.0;
5238   number_coordinates=0;
5239   z_count=0;
5240   primitive_type=primitive_info->primitive;
5241   q=primitive_info;
5242   for (p=path; *p != '\0'; )
5243   {
5244     while (isspace((int) ((unsigned char) *p)) != 0)
5245       p++;
5246     if (*p == '\0')
5247       break;
5248     last_attribute=attribute;
5249     attribute=(int) (*p++);
5250     switch (attribute)
5251     {
5252       case 'a':
5253       case 'A':
5254       {
5255         MagickBooleanType
5256           large_arc,
5257           sweep;
5258
5259         MagickRealType
5260           angle;
5261
5262         PointInfo
5263           arc;
5264
5265         /*
5266           Compute arc points.
5267         */
5268         do
5269         {
5270           GetMagickToken(p,&p,token);
5271           if (*token == ',')
5272             GetMagickToken(p,&p,token);
5273           arc.x=StringToDouble(token);
5274           GetMagickToken(p,&p,token);
5275           if (*token == ',')
5276             GetMagickToken(p,&p,token);
5277           arc.y=StringToDouble(token);
5278           GetMagickToken(p,&p,token);
5279           if (*token == ',')
5280             GetMagickToken(p,&p,token);
5281           angle=StringToDouble(token);
5282           GetMagickToken(p,&p,token);
5283           if (*token == ',')
5284             GetMagickToken(p,&p,token);
5285           large_arc=StringToLong(token) != 0 ? MagickTrue : MagickFalse;
5286           GetMagickToken(p,&p,token);
5287           if (*token == ',')
5288             GetMagickToken(p,&p,token);
5289           sweep=StringToLong(token) != 0 ? MagickTrue : MagickFalse;
5290           GetMagickToken(p,&p,token);
5291           if (*token == ',')
5292             GetMagickToken(p,&p,token);
5293           x=StringToDouble(token);
5294           GetMagickToken(p,&p,token);
5295           if (*token == ',')
5296             GetMagickToken(p,&p,token);
5297           y=StringToDouble(token);
5298           end.x=(double) (attribute == (int) 'A' ? x : point.x+x);
5299           end.y=(double) (attribute == (int) 'A' ? y : point.y+y);
5300           TraceArcPath(q,point,end,arc,angle,large_arc,sweep);
5301           q+=q->coordinates;
5302           point=end;
5303         } while (IsPoint(p) != MagickFalse);
5304         break;
5305       }
5306       case 'c':
5307       case 'C':
5308       {
5309         /*
5310           Compute bezier points.
5311         */
5312         do
5313         {
5314           points[0]=point;
5315           for (i=1; i < 4; i++)
5316           {
5317             GetMagickToken(p,&p,token);
5318             if (*token == ',')
5319               GetMagickToken(p,&p,token);
5320             x=StringToDouble(token);
5321             GetMagickToken(p,&p,token);
5322             if (*token == ',')
5323               GetMagickToken(p,&p,token);
5324             y=StringToDouble(token);
5325             end.x=(double) (attribute == (int) 'C' ? x : point.x+x);
5326             end.y=(double) (attribute == (int) 'C' ? y : point.y+y);
5327             points[i]=end;
5328           }
5329           for (i=0; i < 4; i++)
5330             (q+i)->point=points[i];
5331           TraceBezier(q,4);
5332           q+=q->coordinates;
5333           point=end;
5334         } while (IsPoint(p) != MagickFalse);
5335         break;
5336       }
5337       case 'H':
5338       case 'h':
5339       {
5340         do
5341         {
5342           GetMagickToken(p,&p,token);
5343           if (*token == ',')
5344             GetMagickToken(p,&p,token);
5345           x=StringToDouble(token);
5346           point.x=(double) (attribute == (int) 'H' ? x: point.x+x);
5347           TracePoint(q,point);
5348           q+=q->coordinates;
5349         } while (IsPoint(p) != MagickFalse);
5350         break;
5351       }
5352       case 'l':
5353       case 'L':
5354       {
5355         do
5356         {
5357           GetMagickToken(p,&p,token);
5358           if (*token == ',')
5359             GetMagickToken(p,&p,token);
5360           x=StringToDouble(token);
5361           GetMagickToken(p,&p,token);
5362           if (*token == ',')
5363             GetMagickToken(p,&p,token);
5364           y=StringToDouble(token);
5365           point.x=(double) (attribute == (int) 'L' ? x : point.x+x);
5366           point.y=(double) (attribute == (int) 'L' ? y : point.y+y);
5367           TracePoint(q,point);
5368           q+=q->coordinates;
5369         } while (IsPoint(p) != MagickFalse);
5370         break;
5371       }
5372       case 'M':
5373       case 'm':
5374       {
5375         if (q != primitive_info)
5376           {
5377             primitive_info->coordinates=(size_t) (q-primitive_info);
5378             number_coordinates+=primitive_info->coordinates;
5379             primitive_info=q;
5380           }
5381         i=0;
5382         do
5383         {
5384           GetMagickToken(p,&p,token);
5385           if (*token == ',')
5386             GetMagickToken(p,&p,token);
5387           x=StringToDouble(token);
5388           GetMagickToken(p,&p,token);
5389           if (*token == ',')
5390             GetMagickToken(p,&p,token);
5391           y=StringToDouble(token);
5392           point.x=(double) (attribute == (int) 'M' ? x : point.x+x);
5393           point.y=(double) (attribute == (int) 'M' ? y : point.y+y);
5394           if (i == 0)
5395             start=point;
5396           i++;
5397           TracePoint(q,point);
5398           q+=q->coordinates;
5399           if (attribute == (int) 'M')
5400             {
5401               TracePoint(q,point);
5402               q+=q->coordinates;
5403             }
5404         } while (IsPoint(p) != MagickFalse);
5405         break;
5406       }
5407       case 'q':
5408       case 'Q':
5409       {
5410         /*
5411           Compute bezier points.
5412         */
5413         do
5414         {
5415           points[0]=point;
5416           for (i=1; i < 3; i++)
5417           {
5418             GetMagickToken(p,&p,token);
5419             if (*token == ',')
5420               GetMagickToken(p,&p,token);
5421             x=StringToDouble(token);
5422             GetMagickToken(p,&p,token);
5423             if (*token == ',')
5424               GetMagickToken(p,&p,token);
5425             y=StringToDouble(token);
5426             if (*p == ',')
5427               p++;
5428             end.x=(double) (attribute == (int) 'Q' ? x : point.x+x);
5429             end.y=(double) (attribute == (int) 'Q' ? y : point.y+y);
5430             points[i]=end;
5431           }
5432           for (i=0; i < 3; i++)
5433             (q+i)->point=points[i];
5434           TraceBezier(q,3);
5435           q+=q->coordinates;
5436           point=end;
5437         } while (IsPoint(p) != MagickFalse);
5438         break;
5439       }
5440       case 's':
5441       case 'S':
5442       {
5443         /*
5444           Compute bezier points.
5445         */
5446         do
5447         {
5448           points[0]=points[3];
5449           points[1].x=2.0*points[3].x-points[2].x;
5450           points[1].y=2.0*points[3].y-points[2].y;
5451           for (i=2; i < 4; i++)
5452           {
5453             GetMagickToken(p,&p,token);
5454             if (*token == ',')
5455               GetMagickToken(p,&p,token);
5456             x=StringToDouble(token);
5457             GetMagickToken(p,&p,token);
5458             if (*token == ',')
5459               GetMagickToken(p,&p,token);
5460             y=StringToDouble(token);
5461             if (*p == ',')
5462               p++;
5463             end.x=(double) (attribute == (int) 'S' ? x : point.x+x);
5464             end.y=(double) (attribute == (int) 'S' ? y : point.y+y);
5465             points[i]=end;
5466           }
5467           if (strchr("CcSs",last_attribute) == (char *) NULL)
5468             {
5469               points[0]=points[2];
5470               points[1]=points[3];
5471             }
5472           for (i=0; i < 4; i++)
5473             (q+i)->point=points[i];
5474           TraceBezier(q,4);
5475           q+=q->coordinates;
5476           point=end;
5477         } while (IsPoint(p) != MagickFalse);
5478         break;
5479       }
5480       case 't':
5481       case 'T':
5482       {
5483         /*
5484           Compute bezier points.
5485         */
5486         do
5487         {
5488           points[0]=points[2];
5489           points[1].x=2.0*points[2].x-points[1].x;
5490           points[1].y=2.0*points[2].y-points[1].y;
5491           for (i=2; i < 3; i++)
5492           {
5493             GetMagickToken(p,&p,token);
5494             if (*token == ',')
5495               GetMagickToken(p,&p,token);
5496             x=StringToDouble(token);
5497             GetMagickToken(p,&p,token);
5498             if (*token == ',')
5499               GetMagickToken(p,&p,token);
5500             y=StringToDouble(token);
5501             end.x=(double) (attribute == (int) 'T' ? x : point.x+x);
5502             end.y=(double) (attribute == (int) 'T' ? y : point.y+y);
5503             points[i]=end;
5504           }
5505           if (strchr("QqTt",last_attribute) == (char *) NULL)
5506             {
5507               points[0]=points[2];
5508               points[1]=points[3];
5509             }
5510           for (i=0; i < 3; i++)
5511             (q+i)->point=points[i];
5512           TraceBezier(q,3);
5513           q+=q->coordinates;
5514           point=end;
5515         } while (IsPoint(p) != MagickFalse);
5516         break;
5517       }
5518       case 'v':
5519       case 'V':
5520       {
5521         do
5522         {
5523           GetMagickToken(p,&p,token);
5524           if (*token == ',')
5525             GetMagickToken(p,&p,token);
5526           y=StringToDouble(token);
5527           point.y=(double) (attribute == (int) 'V' ? y : point.y+y);
5528           TracePoint(q,point);
5529           q+=q->coordinates;
5530         } while (IsPoint(p) != MagickFalse);
5531         break;
5532       }
5533       case 'z':
5534       case 'Z':
5535       {
5536         point=start;
5537         TracePoint(q,point);
5538         q+=q->coordinates;
5539         primitive_info->coordinates=(size_t) (q-primitive_info);
5540         number_coordinates+=primitive_info->coordinates;
5541         primitive_info=q;
5542         z_count++;
5543         break;
5544       }
5545       default:
5546       {
5547         if (isalpha((int) ((unsigned char) attribute)) != 0)
5548           (void) fprintf(stderr,"attribute not recognized: %c\n",attribute);
5549         break;
5550       }
5551     }
5552   }
5553   primitive_info->coordinates=(size_t) (q-primitive_info);
5554   number_coordinates+=primitive_info->coordinates;
5555   for (i=0; i < (ssize_t) number_coordinates; i++)
5556   {
5557     q--;
5558     q->primitive=primitive_type;
5559     if (z_count > 1)
5560       q->method=FillToBorderMethod;
5561   }
5562   q=primitive_info;
5563   return(number_coordinates);
5564 }
5565
5566 static void TraceRectangle(PrimitiveInfo *primitive_info,const PointInfo start,
5567   const PointInfo end)
5568 {
5569   PointInfo
5570     point;
5571
5572   register PrimitiveInfo
5573     *p;
5574
5575   register ssize_t
5576     i;
5577
5578   p=primitive_info;
5579   TracePoint(p,start);
5580   p+=p->coordinates;
5581   point.x=start.x;
5582   point.y=end.y;
5583   TracePoint(p,point);
5584   p+=p->coordinates;
5585   TracePoint(p,end);
5586   p+=p->coordinates;
5587   point.x=end.x;
5588   point.y=start.y;
5589   TracePoint(p,point);
5590   p+=p->coordinates;
5591   TracePoint(p,start);
5592   p+=p->coordinates;
5593   primitive_info->coordinates=(size_t) (p-primitive_info);
5594   for (i=0; i < (ssize_t) primitive_info->coordinates; i++)
5595   {
5596     p->primitive=primitive_info->primitive;
5597     p--;
5598   }
5599 }
5600
5601 static void TraceRoundRectangle(PrimitiveInfo *primitive_info,
5602   const PointInfo start,const PointInfo end,PointInfo arc)
5603 {
5604   PointInfo
5605     degrees,
5606     offset,
5607     point;
5608
5609   register PrimitiveInfo
5610     *p;
5611
5612   register ssize_t
5613     i;
5614
5615   p=primitive_info;
5616   offset.x=fabs(end.x-start.x);
5617   offset.y=fabs(end.y-start.y);
5618   if (arc.x > (0.5*offset.x))
5619     arc.x=0.5*offset.x;
5620   if (arc.y > (0.5*offset.y))
5621     arc.y=0.5*offset.y;
5622   point.x=start.x+offset.x-arc.x;
5623   point.y=start.y+arc.y;
5624   degrees.x=270.0;
5625   degrees.y=360.0;
5626   TraceEllipse(p,point,arc,degrees);
5627   p+=p->coordinates;
5628   point.x=start.x+offset.x-arc.x;
5629   point.y=start.y+offset.y-arc.y;
5630   degrees.x=0.0;
5631   degrees.y=90.0;
5632   TraceEllipse(p,point,arc,degrees);
5633   p+=p->coordinates;
5634   point.x=start.x+arc.x;
5635   point.y=start.y+offset.y-arc.y;
5636   degrees.x=90.0;
5637   degrees.y=180.0;
5638   TraceEllipse(p,point,arc,degrees);
5639   p+=p->coordinates;
5640   point.x=start.x+arc.x;
5641   point.y=start.y+arc.y;
5642   degrees.x=180.0;
5643   degrees.y=270.0;
5644   TraceEllipse(p,point,arc,degrees);
5645   p+=p->coordinates;
5646   TracePoint(p,primitive_info->point);
5647   p+=p->coordinates;
5648   primitive_info->coordinates=(size_t) (p-primitive_info);
5649   for (i=0; i < (ssize_t) primitive_info->coordinates; i++)
5650   {
5651     p->primitive=primitive_info->primitive;
5652     p--;
5653   }
5654 }
5655
5656 static void TraceSquareLinecap(PrimitiveInfo *primitive_info,
5657   const size_t number_vertices,const MagickRealType offset)
5658 {
5659   MagickRealType
5660     distance;
5661
5662   ssize_t
5663     j;
5664
5665   register MagickRealType
5666     dx,
5667     dy;
5668
5669   register ssize_t
5670     i;
5671
5672   dx=0.0;
5673   dy=0.0;
5674   for (i=1; i < (ssize_t) number_vertices; i++)
5675   {
5676     dx=primitive_info[0].point.x-primitive_info[i].point.x;
5677     dy=primitive_info[0].point.y-primitive_info[i].point.y;
5678     if ((fabs((double) dx) >= MagickEpsilon) ||
5679         (fabs((double) dy) >= MagickEpsilon))
5680       break;
5681   }
5682   if (i == (ssize_t) number_vertices)
5683     i=(ssize_t) number_vertices-1L;
5684   distance=hypot((double) dx,(double) dy);
5685   primitive_info[0].point.x=(double) (primitive_info[i].point.x+
5686     dx*(distance+offset)/distance);
5687   primitive_info[0].point.y=(double) (primitive_info[i].point.y+
5688     dy*(distance+offset)/distance);
5689   for (j=(ssize_t) number_vertices-2; j >= 0;  j--)
5690   {
5691     dx=primitive_info[number_vertices-1].point.x-primitive_info[j].point.x;
5692     dy=primitive_info[number_vertices-1].point.y-primitive_info[j].point.y;
5693     if ((fabs((double) dx) >= MagickEpsilon) ||
5694         (fabs((double) dy) >= MagickEpsilon))
5695       break;
5696   }
5697   distance=hypot((double) dx,(double) dy);
5698   primitive_info[number_vertices-1].point.x=(double) (primitive_info[j].point.x+
5699     dx*(distance+offset)/distance);
5700   primitive_info[number_vertices-1].point.y=(double) (primitive_info[j].point.y+
5701     dy*(distance+offset)/distance);
5702 }
5703
5704 static PrimitiveInfo *TraceStrokePolygon(const DrawInfo *draw_info,
5705   const PrimitiveInfo *primitive_info)
5706 {
5707   typedef struct _LineSegment
5708   {
5709     double
5710       p,
5711       q;
5712   } LineSegment;
5713
5714   LineSegment
5715     dx,
5716     dy,
5717     inverse_slope,
5718     slope,
5719     theta;
5720
5721   ssize_t
5722     j,
5723     n,
5724     p,
5725     q;
5726
5727   MagickBooleanType
5728     closed_path;
5729
5730   MagickRealType
5731     delta_theta,
5732     dot_product,
5733     mid,
5734     miterlimit;
5735
5736   PointInfo
5737     box_p[5],
5738     box_q[5],
5739     center,
5740     offset,
5741     *path_p,
5742     *path_q;
5743
5744   PrimitiveInfo
5745     *polygon_primitive,
5746     *stroke_polygon;
5747
5748   register ssize_t
5749     i;
5750
5751   size_t
5752     arc_segments,
5753     max_strokes,
5754     number_vertices;
5755
5756   /*
5757     Allocate paths.
5758   */
5759   number_vertices=primitive_info->coordinates;
5760   max_strokes=2*number_vertices+6*BezierQuantum+360;
5761   path_p=(PointInfo *) AcquireQuantumMemory((size_t) max_strokes,
5762     sizeof(*path_p));
5763   path_q=(PointInfo *) AcquireQuantumMemory((size_t) max_strokes,
5764     sizeof(*path_q));
5765   polygon_primitive=(PrimitiveInfo *) AcquireQuantumMemory((size_t)
5766     number_vertices+2UL,sizeof(*polygon_primitive));
5767   if ((path_p == (PointInfo *) NULL) || (path_q == (PointInfo *) NULL) ||
5768       (polygon_primitive == (PrimitiveInfo *) NULL))
5769     return((PrimitiveInfo *) NULL);
5770   (void) CopyMagickMemory(polygon_primitive,primitive_info,(size_t)
5771     number_vertices*sizeof(*polygon_primitive));
5772   closed_path=
5773     (primitive_info[number_vertices-1].point.x == primitive_info[0].point.x) &&
5774     (primitive_info[number_vertices-1].point.y == primitive_info[0].point.y) ?
5775     MagickTrue : MagickFalse;
5776   if ((draw_info->linejoin == RoundJoin) ||
5777       ((draw_info->linejoin == MiterJoin) && (closed_path != MagickFalse)))
5778     {
5779       polygon_primitive[number_vertices]=primitive_info[1];
5780       number_vertices++;
5781     }
5782   polygon_primitive[number_vertices].primitive=UndefinedPrimitive;
5783   /*
5784     Compute the slope for the first line segment, p.
5785   */
5786   dx.p=0.0;
5787   dy.p=0.0;
5788   for (n=1; n < (ssize_t) number_vertices; n++)
5789   {
5790     dx.p=polygon_primitive[n].point.x-polygon_primitive[0].point.x;
5791     dy.p=polygon_primitive[n].point.y-polygon_primitive[0].point.y;
5792     if ((fabs(dx.p) >= MagickEpsilon) || (fabs(dy.p) >= MagickEpsilon))
5793       break;
5794   }
5795   if (n == (ssize_t) number_vertices)
5796     n=(ssize_t) number_vertices-1L;
5797   slope.p=0.0;
5798   inverse_slope.p=0.0;
5799   if (fabs(dx.p) <= MagickEpsilon)
5800     {
5801       if (dx.p >= 0.0)
5802         slope.p=dy.p < 0.0 ? -1.0/MagickEpsilon : 1.0/MagickEpsilon;
5803       else
5804         slope.p=dy.p < 0.0 ? 1.0/MagickEpsilon : -1.0/MagickEpsilon;
5805     }
5806   else
5807     if (fabs(dy.p) <= MagickEpsilon)
5808       {
5809         if (dy.p >= 0.0)
5810           inverse_slope.p=dx.p < 0.0 ? -1.0/MagickEpsilon : 1.0/MagickEpsilon;
5811         else
5812           inverse_slope.p=dx.p < 0.0 ? 1.0/MagickEpsilon : -1.0/MagickEpsilon;
5813       }
5814     else
5815       {
5816         slope.p=dy.p/dx.p;
5817         inverse_slope.p=(-1.0/slope.p);
5818       }
5819   mid=ExpandAffine(&draw_info->affine)*draw_info->stroke_width/2.0;
5820   miterlimit=(MagickRealType) (draw_info->miterlimit*draw_info->miterlimit*
5821     mid*mid);
5822   if ((draw_info->linecap == SquareCap) && (closed_path == MagickFalse))
5823     TraceSquareLinecap(polygon_primitive,number_vertices,mid);
5824   offset.x=sqrt((double) (mid*mid/(inverse_slope.p*inverse_slope.p+1.0)));
5825   offset.y=(double) (offset.x*inverse_slope.p);
5826   if ((dy.p*offset.x-dx.p*offset.y) > 0.0)
5827     {
5828       box_p[0].x=polygon_primitive[0].point.x-offset.x;
5829       box_p[0].y=polygon_primitive[0].point.y-offset.x*inverse_slope.p;
5830       box_p[1].x=polygon_primitive[n].point.x-offset.x;
5831       box_p[1].y=polygon_primitive[n].point.y-offset.x*inverse_slope.p;
5832       box_q[0].x=polygon_primitive[0].point.x+offset.x;
5833       box_q[0].y=polygon_primitive[0].point.y+offset.x*inverse_slope.p;
5834       box_q[1].x=polygon_primitive[n].point.x+offset.x;
5835       box_q[1].y=polygon_primitive[n].point.y+offset.x*inverse_slope.p;
5836     }
5837   else
5838     {
5839       box_p[0].x=polygon_primitive[0].point.x+offset.x;
5840       box_p[0].y=polygon_primitive[0].point.y+offset.y;
5841       box_p[1].x=polygon_primitive[n].point.x+offset.x;
5842       box_p[1].y=polygon_primitive[n].point.y+offset.y;
5843       box_q[0].x=polygon_primitive[0].point.x-offset.x;
5844       box_q[0].y=polygon_primitive[0].point.y-offset.y;
5845       box_q[1].x=polygon_primitive[n].point.x-offset.x;
5846       box_q[1].y=polygon_primitive[n].point.y-offset.y;
5847     }
5848   /*
5849     Create strokes for the line join attribute: bevel, miter, round.
5850   */
5851   p=0;
5852   q=0;
5853   path_q[p++]=box_q[0];
5854   path_p[q++]=box_p[0];
5855   for (i=(ssize_t) n+1; i < (ssize_t) number_vertices; i++)
5856   {
5857     /*
5858       Compute the slope for this line segment, q.
5859     */
5860     dx.q=polygon_primitive[i].point.x-polygon_primitive[n].point.x;
5861     dy.q=polygon_primitive[i].point.y-polygon_primitive[n].point.y;
5862     dot_product=dx.q*dx.q+dy.q*dy.q;
5863     if (dot_product < 0.25)
5864       continue;
5865     slope.q=0.0;
5866     inverse_slope.q=0.0;
5867     if (fabs(dx.q) < MagickEpsilon)
5868       {
5869         if (dx.q >= 0.0)
5870           slope.q=dy.q < 0.0 ? -1.0/MagickEpsilon : 1.0/MagickEpsilon;
5871         else
5872           slope.q=dy.q < 0.0 ? 1.0/MagickEpsilon : -1.0/MagickEpsilon;
5873       }
5874     else
5875       if (fabs(dy.q) <= MagickEpsilon)
5876         {
5877           if (dy.q >= 0.0)
5878             inverse_slope.q=dx.q < 0.0 ? -1.0/MagickEpsilon : 1.0/MagickEpsilon;
5879           else
5880             inverse_slope.q=dx.q < 0.0 ? 1.0/MagickEpsilon : -1.0/MagickEpsilon;
5881         }
5882       else
5883         {
5884           slope.q=dy.q/dx.q;
5885           inverse_slope.q=(-1.0/slope.q);
5886         }
5887     offset.x=sqrt((double) (mid*mid/(inverse_slope.q*inverse_slope.q+1.0)));
5888     offset.y=(double) (offset.x*inverse_slope.q);
5889     dot_product=dy.q*offset.x-dx.q*offset.y;
5890     if (dot_product > 0.0)
5891       {
5892         box_p[2].x=polygon_primitive[n].point.x-offset.x;
5893         box_p[2].y=polygon_primitive[n].point.y-offset.y;
5894         box_p[3].x=polygon_primitive[i].point.x-offset.x;
5895         box_p[3].y=polygon_primitive[i].point.y-offset.y;
5896         box_q[2].x=polygon_primitive[n].point.x+offset.x;
5897         box_q[2].y=polygon_primitive[n].point.y+offset.y;
5898         box_q[3].x=polygon_primitive[i].point.x+offset.x;
5899         box_q[3].y=polygon_primitive[i].point.y+offset.y;
5900       }
5901     else
5902       {
5903         box_p[2].x=polygon_primitive[n].point.x+offset.x;
5904         box_p[2].y=polygon_primitive[n].point.y+offset.y;
5905         box_p[3].x=polygon_primitive[i].point.x+offset.x;
5906         box_p[3].y=polygon_primitive[i].point.y+offset.y;
5907         box_q[2].x=polygon_primitive[n].point.x-offset.x;
5908         box_q[2].y=polygon_primitive[n].point.y-offset.y;
5909         box_q[3].x=polygon_primitive[i].point.x-offset.x;
5910         box_q[3].y=polygon_primitive[i].point.y-offset.y;
5911       }
5912     if (fabs((double) (slope.p-slope.q)) <= MagickEpsilon)
5913       {
5914         box_p[4]=box_p[1];
5915         box_q[4]=box_q[1];
5916       }
5917     else
5918       {
5919         box_p[4].x=(double) ((slope.p*box_p[0].x-box_p[0].y-slope.q*box_p[3].x+
5920           box_p[3].y)/(slope.p-slope.q));
5921         box_p[4].y=(double) (slope.p*(box_p[4].x-box_p[0].x)+box_p[0].y);
5922         box_q[4].x=(double) ((slope.p*box_q[0].x-box_q[0].y-slope.q*box_q[3].x+
5923           box_q[3].y)/(slope.p-slope.q));
5924         box_q[4].y=(double) (slope.p*(box_q[4].x-box_q[0].x)+box_q[0].y);
5925       }
5926     if (q >= (ssize_t) (max_strokes-6*BezierQuantum-360))
5927       {
5928          max_strokes+=6*BezierQuantum+360;
5929          path_p=(PointInfo *) ResizeQuantumMemory(path_p,(size_t) max_strokes,
5930            sizeof(*path_p));
5931          path_q=(PointInfo *) ResizeQuantumMemory(path_q,(size_t) max_strokes,
5932            sizeof(*path_q));
5933          if ((path_p == (PointInfo *) NULL) || (path_q == (PointInfo *) NULL))
5934            {
5935              polygon_primitive=(PrimitiveInfo *)
5936                RelinquishMagickMemory(polygon_primitive);
5937              return((PrimitiveInfo *) NULL);
5938            }
5939       }
5940     dot_product=dx.q*dy.p-dx.p*dy.q;
5941     if (dot_product <= 0.0)
5942       switch (draw_info->linejoin)
5943       {
5944         case BevelJoin:
5945         {
5946           path_q[q++]=box_q[1];
5947           path_q[q++]=box_q[2];
5948           dot_product=(box_q[4].x-box_p[4].x)*(box_q[4].x-box_p[4].x)+
5949             (box_q[4].y-box_p[4].y)*(box_q[4].y-box_p[4].y);
5950           if (dot_product <= miterlimit)
5951             path_p[p++]=box_p[4];
5952           else
5953             {
5954               path_p[p++]=box_p[1];
5955               path_p[p++]=box_p[2];
5956             }
5957           break;
5958         }
5959         case MiterJoin:
5960         {
5961           dot_product=(box_q[4].x-box_p[4].x)*(box_q[4].x-box_p[4].x)+
5962             (box_q[4].y-box_p[4].y)*(box_q[4].y-box_p[4].y);
5963           if (dot_product <= miterlimit)
5964             {
5965               path_q[q++]=box_q[4];
5966               path_p[p++]=box_p[4];
5967             }
5968           else
5969             {
5970               path_q[q++]=box_q[1];
5971               path_q[q++]=box_q[2];
5972               path_p[p++]=box_p[1];
5973               path_p[p++]=box_p[2];
5974             }
5975           break;
5976         }
5977         case RoundJoin:
5978         {
5979           dot_product=(box_q[4].x-box_p[4].x)*(box_q[4].x-box_p[4].x)+
5980             (box_q[4].y-box_p[4].y)*(box_q[4].y-box_p[4].y);
5981           if (dot_product <= miterlimit)
5982             path_p[p++]=box_p[4];
5983           else
5984             {
5985               path_p[p++]=box_p[1];
5986               path_p[p++]=box_p[2];
5987             }
5988           center=polygon_primitive[n].point;
5989           theta.p=atan2(box_q[1].y-center.y,box_q[1].x-center.x);
5990           theta.q=atan2(box_q[2].y-center.y,box_q[2].x-center.x);
5991           if (theta.q < theta.p)
5992             theta.q+=(MagickRealType) (2.0*MagickPI);
5993           arc_segments=(size_t) ceil((double) ((theta.q-theta.p)/
5994             (2.0*sqrt((double) (1.0/mid)))));
5995           path_q[q].x=box_q[1].x;
5996           path_q[q].y=box_q[1].y;
5997           q++;
5998           for (j=1; j < (ssize_t) arc_segments; j++)
5999           {
6000             delta_theta=(MagickRealType) (j*(theta.q-theta.p)/arc_segments);
6001             path_q[q].x=(double) (center.x+mid*cos(fmod((double)
6002               (theta.p+delta_theta),DegreesToRadians(360.0))));
6003             path_q[q].y=(double) (center.y+mid*sin(fmod((double)
6004               (theta.p+delta_theta),DegreesToRadians(360.0))));
6005             q++;
6006           }
6007           path_q[q++]=box_q[2];
6008           break;
6009         }
6010         default:
6011           break;
6012       }
6013     else
6014       switch (draw_info->linejoin)
6015       {
6016         case BevelJoin:
6017         {
6018           path_p[p++]=box_p[1];
6019           path_p[p++]=box_p[2];
6020           dot_product=(box_q[4].x-box_p[4].x)*(box_q[4].x-box_p[4].x)+
6021             (box_q[4].y-box_p[4].y)*(box_q[4].y-box_p[4].y);
6022           if (dot_product <= miterlimit)
6023             path_q[q++]=box_q[4];
6024           else
6025             {
6026               path_q[q++]=box_q[1];
6027               path_q[q++]=box_q[2];
6028             }
6029           break;
6030         }
6031         case MiterJoin:
6032         {
6033           dot_product=(box_q[4].x-box_p[4].x)*(box_q[4].x-box_p[4].x)+
6034             (box_q[4].y-box_p[4].y)*(box_q[4].y-box_p[4].y);
6035           if (dot_product <= miterlimit)
6036             {
6037               path_q[q++]=box_q[4];
6038               path_p[p++]=box_p[4];
6039             }
6040           else
6041             {
6042               path_q[q++]=box_q[1];
6043               path_q[q++]=box_q[2];
6044               path_p[p++]=box_p[1];
6045               path_p[p++]=box_p[2];
6046             }
6047           break;
6048         }
6049         case RoundJoin:
6050         {
6051           dot_product=(box_q[4].x-box_p[4].x)*(box_q[4].x-box_p[4].x)+
6052             (box_q[4].y-box_p[4].y)*(box_q[4].y-box_p[4].y);
6053           if (dot_product <= miterlimit)
6054             path_q[q++]=box_q[4];
6055           else
6056             {
6057               path_q[q++]=box_q[1];
6058               path_q[q++]=box_q[2];
6059             }
6060           center=polygon_primitive[n].point;
6061           theta.p=atan2(box_p[1].y-center.y,box_p[1].x-center.x);
6062           theta.q=atan2(box_p[2].y-center.y,box_p[2].x-center.x);
6063           if (theta.p < theta.q)
6064             theta.p+=(MagickRealType) (2.0*MagickPI);
6065           arc_segments=(size_t) ceil((double) ((theta.p-theta.q)/
6066             (2.0*sqrt((double) (1.0/mid)))));
6067           path_p[p++]=box_p[1];
6068           for (j=1; j < (ssize_t) arc_segments; j++)
6069           {
6070             delta_theta=(MagickRealType) (j*(theta.q-theta.p)/arc_segments);
6071             path_p[p].x=(double) (center.x+mid*cos(fmod((double)
6072               (theta.p+delta_theta),DegreesToRadians(360.0))));
6073             path_p[p].y=(double) (center.y+mid*sin(fmod((double)
6074               (theta.p+delta_theta),DegreesToRadians(360.0))));
6075             p++;
6076           }
6077           path_p[p++]=box_p[2];
6078           break;
6079         }
6080         default:
6081           break;
6082       }
6083     slope.p=slope.q;
6084     inverse_slope.p=inverse_slope.q;
6085     box_p[0]=box_p[2];
6086     box_p[1]=box_p[3];
6087     box_q[0]=box_q[2];
6088     box_q[1]=box_q[3];
6089     dx.p=dx.q;
6090     dy.p=dy.q;
6091     n=i;
6092   }
6093   path_p[p++]=box_p[1];
6094   path_q[q++]=box_q[1];
6095   /*
6096     Trace stroked polygon.
6097   */
6098   stroke_polygon=(PrimitiveInfo *) AcquireQuantumMemory((size_t)
6099     (p+q+2UL*closed_path+2UL),sizeof(*stroke_polygon));
6100   if (stroke_polygon != (PrimitiveInfo *) NULL)
6101     {
6102       for (i=0; i < (ssize_t) p; i++)
6103       {
6104         stroke_polygon[i]=polygon_primitive[0];
6105         stroke_polygon[i].point=path_p[i];
6106       }
6107       if (closed_path != MagickFalse)
6108         {
6109           stroke_polygon[i]=polygon_primitive[0];
6110           stroke_polygon[i].point=stroke_polygon[0].point;
6111           i++;
6112         }
6113       for ( ; i < (ssize_t) (p+q+closed_path); i++)
6114       {
6115         stroke_polygon[i]=polygon_primitive[0];
6116         stroke_polygon[i].point=path_q[p+q+closed_path-(i+1)];
6117       }
6118       if (closed_path != MagickFalse)
6119         {
6120           stroke_polygon[i]=polygon_primitive[0];
6121           stroke_polygon[i].point=stroke_polygon[p+closed_path].point;
6122           i++;
6123         }
6124       stroke_polygon[i]=polygon_primitive[0];
6125       stroke_polygon[i].point=stroke_polygon[0].point;
6126       i++;
6127       stroke_polygon[i].primitive=UndefinedPrimitive;
6128       stroke_polygon[0].coordinates=(size_t) (p+q+2*closed_path+1);
6129     }
6130   path_p=(PointInfo *) RelinquishMagickMemory(path_p);
6131   path_q=(PointInfo *) RelinquishMagickMemory(path_q);
6132   polygon_primitive=(PrimitiveInfo *) RelinquishMagickMemory(polygon_primitive);
6133   return(stroke_polygon);
6134 }