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