lib/devices/polyops.c

   1 /* polyops.c
   2
   3    Part of the swftools package.
   4
   5    Copyright (c) 2008 Matthias Kramm <kramm@quiss.org>
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
  20
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <stdarg.h>
  24 #ifndef WIN32
  25 #include <unistd.h>
  26 #endif
  27 #include <memory.h>
  28 #include <assert.h>
  29 #include <string.h>
  30 #include <math.h>
  31 #include "../mem.h"
  32 #include "../gfxdevice.h"
  33 #include "../gfxtools.h"
  34 #include "../gfxpoly.h"
  35 #include "../log.h"
  36 #include "polyops.h"
  37
  38 typedef struct _clip {
  39     gfxpoly_t*poly;
  40     int openclips;
  41     struct _clip*next;
  42 } clip_t;
  43
  44 typedef struct _internal {
  45     gfxdevice_t*out;
  46     clip_t*clip;
  47     gfxpoly_t*polyunion;
  48
  49     int good_polygons;
  50     int bad_polygons;
  51 } internal_t;
  52
  53 static int verbose = 0;
  54
  55 static void dbg(char*format, ...)
  56 {
  57     if(!verbose)
  58         return;
  59     char buf[1024];
  60     int l;
  61     va_list arglist;
  62     va_start(arglist, format);
  63     vsprintf(buf, format, arglist);
  64     va_end(arglist);
  65     l = strlen(buf);
  66     while(l && buf[l-1]=='\n') {
  67         buf[l-1] = 0;
  68         l--;
  69     }
  70     printf("(device-polyops) %s\n", buf);
  71     fflush(stdout);
  72 }
  73
  74 int polyops_setparameter(struct _gfxdevice*dev, const char*key, const char*value)
  75 {
  76     dbg("polyops_setparameter");
  77     internal_t*i = (internal_t*)dev->internal;
  78     if(i->out) return i->out->setparameter(i->out,key,value);
  79     else return 0;
  80 }
  81
  82 void polyops_startpage(struct _gfxdevice*dev, int width, int height)
  83 {
  84     dbg("polyops_startpage");
  85     internal_t*i = (internal_t*)dev->internal;
  86     if(i->out) i->out->startpage(i->out,width,height);
  87 }
  88
  89 void polyops_startclip(struct _gfxdevice*dev, gfxline_t*line)
  90 {
  91     dbg("polyops_startclip");
  92     internal_t*i = (internal_t*)dev->internal;
  93
  94     gfxpoly_t* oldclip = i->clip?i->clip->poly:0;
  95     gfxpoly_t* poly = gfxpoly_fillToPoly(line);
  96     if(poly)
  97         i->good_polygons++;
  98     else
  99         i->bad_polygons++;
 100
 101     gfxpoly_t* currentclip = 0;
 102     int type = 0;
 103
 104     /* we can't rely on gfxpoly actually being able to convert
 105        a gfxline into a gfxpoly- for polygons which are too
 106        complex or just degenerate, this might fail. So handle
 107        all the cases where polygon conversion or intersection
 108        might go awry */
 109     if(!poly && !oldclip) {
 110         i->out->startclip(i->out,line);
 111         currentclip = 0;
 112         type = 1;
 113     } else if(!poly && oldclip) {
 114         gfxline_t*oldclipline = gfxpoly_to_gfxline(oldclip);
 115         i->out->startclip(i->out,oldclipline);
 116         i->out->startclip(i->out,line);
 117         currentclip = 0;
 118         type = 2;
 119     } else if(poly && oldclip) {
 120         gfxpoly_t*intersection = gfxpoly_intersect(poly, oldclip);
 121         if(intersection) {
 122             i->good_polygons++;
 123             // this case is what usually happens
 124             gfxpoly_free(poly);poly=0;
 125             currentclip = intersection;
 126             type = 0;
 127         } else {
 128             i->bad_polygons++;
 129             gfxline_t*oldclipline = gfxpoly_to_gfxline(oldclip);
 130             i->out->startclip(i->out, oldclipline);
 131             currentclip = poly;
 132             type = 1;
 133         }
 134     } else if(poly && !oldclip) {
 135         currentclip = poly;
 136         type = 0;
 137     }
 138
 139     clip_t*n = i->clip;
 140     i->clip = (clip_t*)rfx_calloc(sizeof(clip_t));
 141     i->clip->next = n;
 142     i->clip->poly = currentclip;
 143     i->clip->openclips = type;
 144 }
 145
 146 void polyops_endclip(struct _gfxdevice*dev)
 147 {
 148     dbg("polyops_endclip");
 149     internal_t*i = (internal_t*)dev->internal;
 150
 151     if(!i->clip) {
 152         msg("<error> endclip without startclip (in: polyops)\n");
 153         return;
 154     }
 155
 156     clip_t*old = i->clip;
 157     i->clip = i->clip->next;
 158     if(old->poly) {
 159         gfxpoly_free(old->poly);old->poly = 0;
 160     }
 161     int t;
 162     for(t=0;t<old->openclips;t++)
 163         i->out->endclip(i->out);
 164
 165     old->next = 0;free(old);
 166 }
 167
 168 static void addtounion(struct _gfxdevice*dev, gfxpoly_t*poly)
 169 {
 170     internal_t*i = (internal_t*)dev->internal;
 171     if(poly && i->polyunion) {
 172         gfxpoly_t*old = i->polyunion;
 173         gfxpoly_t*newpoly = gfxpoly_union(poly,i->polyunion);
 174         i->polyunion = newpoly;
 175         gfxpoly_free(old);
 176     }
 177 }
 178
 179 static gfxline_t* handle_poly(gfxdevice_t*dev, gfxpoly_t*poly, char*ok)
 180 {
 181     internal_t*i = (internal_t*)dev->internal;
 182     if(i->clip && i->clip->poly) {
 183         gfxpoly_t*old = poly;
 184         if(poly) {
 185             poly = gfxpoly_intersect(poly, i->clip->poly);
 186             gfxpoly_free(old);
 187         }
 188     }
 189
 190     if(poly)
 191         i->good_polygons++;
 192     else
 193         i->bad_polygons++;
 194
 195     addtounion(dev, poly);
 196     gfxline_t*gfxline = 0;
 197     if(poly) {
 198         // this is the case where everything went right
 199         gfxline_t*line = gfxpoly_to_gfxline(poly);
 200         gfxpoly_free(poly);
 201         *ok = 1;
 202         return line;
 203     } else {
 204         if(i->clip && i->clip->poly) {
 205             /* convert current clipping from a polygon to an
 206                actual "startclip" written to the output */
 207             assert(i->clip->openclips <= 1);
 208             gfxline_t*clipline = gfxpoly_to_gfxline(i->clip->poly);
 209             i->out->startclip(i->out, clipline);
 210             gfxline_free(clipline);
 211             gfxpoly_free(i->clip->poly);i->clip->poly = 0;
 212             i->clip->openclips++;
 213             return 0;
 214         } else {
 215             return 0;
 216         }
 217     }
 218 }
 219
 220 void polyops_stroke(struct _gfxdevice*dev, gfxline_t*line, gfxcoord_t width, gfxcolor_t*color, gfx_capType cap_style, gfx_joinType joint_style, gfxcoord_t miterLimit)
 221 {
 222     dbg("polyops_stroke");
 223     internal_t*i = (internal_t*)dev->internal;
 224
 225     gfxpoly_t* poly = gfxpoly_strokeToPoly(line, width, cap_style, joint_style, miterLimit);
 226     char ok = 0;
 227     gfxline_t*line2 = handle_poly(dev, poly, &ok);
 228
 229     if(ok) {
 230         if(i->out && line2) i->out->fill(i->out, line2, color);
 231         gfxline_free(line2);
 232     } else {
 233         msg("<error> ..");
 234         if(i->out) i->out->stroke(i->out, line, width, color, cap_style, joint_style, miterLimit);
 235     }
 236 }
 237
 238 void polyops_fill(struct _gfxdevice*dev, gfxline_t*line, gfxcolor_t*color)
 239 {
 240     dbg("polyops_fill");
 241     internal_t*i = (internal_t*)dev->internal;
 242
 243     gfxpoly_t*poly = gfxpoly_fillToPoly(line);
 244     char ok = 0;
 245     gfxline_t*line2 = handle_poly(dev, poly, &ok);
 246
 247     if(ok) {
 248         if(i->out && line2) i->out->fill(i->out, line2, color);
 249         gfxline_free(line2);
 250     } else {
 251         if(i->out) i->out->fill(i->out, line, color);
 252     }
 253 }
 254
 255 void polyops_fillbitmap(struct _gfxdevice*dev, gfxline_t*line, gfximage_t*img, gfxmatrix_t*matrix, gfxcxform_t*cxform)
 256 {
 257     dbg("polyops_fillbitmap");
 258     internal_t*i = (internal_t*)dev->internal;
 259
 260     gfxpoly_t*poly = gfxpoly_fillToPoly(line);
 261     char ok = 0;
 262     gfxline_t*line2 = handle_poly(dev, poly, &ok);
 263
 264     if(ok) {
 265         if(i->out && line2) i->out->fillbitmap(i->out, line2, img, matrix, cxform);
 266         gfxline_free(line2);
 267     } else {
 268         if(i->out) i->out->fillbitmap(i->out, line, img, matrix, cxform);
 269     }
 270 }
 271
 272 void polyops_fillgradient(struct _gfxdevice*dev, gfxline_t*line, gfxgradient_t*gradient, gfxgradienttype_t type, gfxmatrix_t*matrix)
 273 {
 274     dbg("polyops_fillgradient");
 275     internal_t*i = (internal_t*)dev->internal;
 276
 277     gfxpoly_t*poly = gfxpoly_fillToPoly(line);
 278     char ok = 0;
 279     gfxline_t*line2 = handle_poly(dev, poly, &ok);
 280
 281     if(ok) {
 282         if(i->out && line2) i->out->fillgradient(i->out, line2, gradient, type, matrix);
 283         gfxline_free(line2);
 284     } else {
 285         if(i->out) i->out->fillgradient(i->out, line, gradient, type, matrix);
 286     }
 287 }
 288
 289 void polyops_addfont(struct _gfxdevice*dev, gfxfont_t*font)
 290 {
 291     dbg("polyops_addfont");
 292     internal_t*i = (internal_t*)dev->internal;
 293     if(i->out) i->out->addfont(i->out, font);
 294 }
 295
 296 void polyops_drawchar(struct _gfxdevice*dev, gfxfont_t*font, int glyphnr, gfxcolor_t*color, gfxmatrix_t*matrix)
 297 {
 298     dbg("polyops_drawchar");
 299     if(!font)
 300         return;
 301     internal_t*i = (internal_t*)dev->internal;
 302     gfxline_t*glyph = gfxline_clone(font->glyphs[glyphnr].line);
 303     gfxline_transform(glyph, matrix);
 304
 305     if(i->clip && i->clip->poly) {
 306         gfxbbox_t bbox = gfxline_getbbox(glyph);
 307         gfxpoly_t*dummybox = gfxpoly_createbox(bbox.xmin,bbox.ymin,bbox.xmax,bbox.ymax);
 308
 309         char ok=0;
 310         gfxline_t*gfxline = handle_poly(dev, dummybox, &ok);
 311         if(ok) {
 312             gfxbbox_t bbox2 = gfxline_getbbox(gfxline);
 313             double w = bbox2.xmax - bbox2.xmin;
 314             double h = bbox2.ymax - bbox2.ymin;
 315             if(w < 0.001 || h < 0.001) /* character was clipped completely */ {
 316             } else if(fabs((bbox.xmax - bbox.xmin) - w) > 0.05 ||
 317                       fabs((bbox.ymax - bbox.ymin) - h) > 0.05) {
 318                 /* notable change in character size: character was clipped
 319                    TODO: how to deal with diagonal cuts?
 320                  */
 321                 polyops_fill(dev, glyph, color);
 322             } else {
 323                 if(i->out) i->out->drawchar(i->out, font, glyphnr, color, matrix);
 324             }
 325         } else {
 326             if(i->out) i->out->drawchar(i->out, font, glyphnr, color, matrix);
 327         }
 328     } else {
 329         if(i->out) i->out->drawchar(i->out, font, glyphnr, color, matrix);
 330     }
 331
 332     gfxline_free(glyph);
 333 }
 334
 335 void polyops_drawlink(struct _gfxdevice*dev, gfxline_t*line, const char*action)
 336 {
 337     dbg("polyops_drawlink");
 338     internal_t*i = (internal_t*)dev->internal;
 339     if(i->out) i->out->drawlink(i->out, line, action);
 340 }
 341
 342 void polyops_endpage(struct _gfxdevice*dev)
 343 {
 344     dbg("polyops_endpage");
 345     internal_t*i = (internal_t*)dev->internal;
 346     if(i->out) i->out->endpage(i->out);
 347 }
 348
 349 gfxresult_t* polyops_finish(struct _gfxdevice*dev)
 350 {
 351     dbg("polyops_finish");
 352     internal_t*i = (internal_t*)dev->internal;
 353
 354
 355     if(i->polyunion) {
 356         gfxpoly_free(i->polyunion);i->polyunion=0;
 357     } else {
 358         if(i->bad_polygons) {
 359             msg("<notice> --flatten success rate: %.1f%% (%d failed polygons)", i->good_polygons*100.0 / (i->good_polygons + i->bad_polygons), i->bad_polygons);
 360         }
 361     }
 362     if(i->out) {
 363         return i->out->finish(i->out);
 364     } else {
 365         return 0;
 366     }
 367 }
 368
 369 gfxline_t*gfxdevice_union_getunion(struct _gfxdevice*dev)
 370 {
 371     internal_t*i = (internal_t*)dev->internal;
 372     return gfxpoly_to_gfxline(i->polyunion);
 373 }
 374
 375 void gfxdevice_removeclippings_init(gfxdevice_t*dev, gfxdevice_t*out)
 376 {
 377     dbg("gfxdevice_removeclippings_init");
 378     internal_t*i = (internal_t*)rfx_calloc(sizeof(internal_t));
 379     memset(dev, 0, sizeof(gfxdevice_t));
 380
 381     dev->name = "removeclippings";
 382
 383     dev->internal = i;
 384
 385     dev->setparameter = polyops_setparameter;
 386     dev->startpage = polyops_startpage;
 387     dev->startclip = polyops_startclip;
 388     dev->endclip = polyops_endclip;
 389     dev->stroke = polyops_stroke;
 390     dev->fill = polyops_fill;
 391     dev->fillbitmap = polyops_fillbitmap;
 392     dev->fillgradient = polyops_fillgradient;
 393     dev->addfont = polyops_addfont;
 394     dev->drawchar = polyops_drawchar;
 395     dev->drawlink = polyops_drawlink;
 396     dev->endpage = polyops_endpage;
 397     dev->finish = polyops_finish;
 398
 399     i->out = out;
 400     i->polyunion = 0;
 401 }
 402
 403 void gfxdevice_union_init(gfxdevice_t*dev,gfxdevice_t*out)
 404 {
 405     dbg("gfxdevice_getunion_init");
 406     internal_t*i = (internal_t*)rfx_calloc(sizeof(internal_t));
 407     memset(dev, 0, sizeof(gfxdevice_t));
 408
 409     dev->name = "union";
 410
 411     dev->internal = i;
 412
 413     dev->setparameter = polyops_setparameter;
 414     dev->startpage = polyops_startpage;
 415     dev->startclip = polyops_startclip;
 416     dev->endclip = polyops_endclip;
 417     dev->stroke = polyops_stroke;
 418     dev->fill = polyops_fill;
 419     dev->fillbitmap = polyops_fillbitmap;
 420     dev->fillgradient = polyops_fillgradient;
 421     dev->addfont = polyops_addfont;
 422     dev->drawchar = polyops_drawchar;
 423     dev->drawlink = polyops_drawlink;
 424     dev->endpage = polyops_endpage;
 425     dev->finish = polyops_finish;
 426
 427     i->out = out;
 428     i->polyunion = gfxpoly_strokeToPoly(0, 0, gfx_capButt, gfx_joinMiter, 0);
 429 }
 430