src/glyphs.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2 /*
   3  * glyphs.cpp:
   4  *
   5  * Contact:
   6  *   Moonlight List (moonlight-list@lists.ximian.com)
   7  *
   8  * Copyright 2007 Novell, Inc. (http://www.novell.com)
   9  *
  10  * See the LICENSE file included with the distribution for details.
  11  */
  12
  13 #include <config.h>
  14
  15 #include <cairo.h>
  16
  17 #include <sys/types.h>
  18 #include <sys/stat.h>
  19 #include <unistd.h>
  20 #include <errno.h>
  21 #include <math.h>
  22
  23 #include "file-downloader.h"
  24 #include "runtime.h"
  25 #include "glyphs.h"
  26 #include "utils.h"
  27 #include "debug.h"
  28 #include "uri.h"
  29 #include "geometry.h"
  30
  31 #if DEBUG
  32 #define d(x) x
  33 #else
  34 #define d(x)
  35 #endif
  36
  37 #define ORIGIN_IS_SET(x) ((x) > -HUGE)
  38
  39 //
  40 // Glyphs
  41 //
  42
  43 enum GlyphAttrMask {
  44         Cluster = 1 << 1,
  45         Index   = 1 << 2,
  46         Advance = 1 << 3,
  47         uOffset = 1 << 4,
  48         vOffset = 1 << 5,
  49 };
  50
  51 class GlyphAttr : public List::Node {
  52  public:
  53         guint32 glyph_count;
  54         guint32 code_units;
  55         guint32 index;
  56         double advance;
  57         double uoffset;
  58         double voffset;
  59         guint8 set;
  60
  61         GlyphAttr ();
  62 };
  63
  64 GlyphAttr::GlyphAttr ()
  65 {
  66         glyph_count = 1;
  67         code_units = 1;
  68         set = 0;
  69 }
  70
  71 Glyphs::Glyphs ()
  72 {
  73         SetObjectType (Type::GLYPHS);
  74
  75         downloader = NULL;
  76
  77         fill = NULL;
  78         path = NULL;
  79
  80         attrs = new List ();
  81         text = NULL;
  82         font = NULL;
  83
  84         height = 0.0;
  85         width = 0.0;
  86         left = 0.0;
  87         top = 0.0;
  88
  89         uri_changed = false;
  90         invalid = false;
  91         dirty = false;
  92 }
  93
  94 Glyphs::~Glyphs ()
  95 {
  96         CleanupDownloader ();
  97
  98         if (path)
  99                 moon_path_destroy (path);
 100
 101         attrs->Clear (true);
 102         delete attrs;
 103
 104         g_free (text);
 105
 106         delete font;
 107 }
 108
 109 void
 110 Glyphs::CleanupDownloader ()
 111 {
 112         if (downloader) {
 113                 downloader->RemoveHandler (Downloader::CompletedEvent, downloader_complete, this);
 114                 downloader->Abort ();
 115                 downloader->unref ();
 116                 downloader = NULL;
 117         }
 118 }
 119
 120 void
 121 Glyphs::Layout ()
 122 {
 123         double size = GetFontRenderingEmSize ();
 124         guint32 code_units, glyph_count, i;
 125         bool first_char = true;
 126         double x0, x1, y0, y1;
 127         double bottom, right;
 128         double bottom0, top0;
 129         GlyphInfo *glyph;
 130         GlyphAttr *attr;
 131         int nglyphs = 0;
 132         double offset;
 133         bool cluster;
 134         double scale;
 135         int n = 0;
 136
 137         invalid = false;
 138         dirty = false;
 139
 140         height = 0.0;
 141         width = 0.0;
 142         left = 0.0;
 143         top = 0.0;
 144
 145         if (path) {
 146                 moon_path_destroy (path);
 147                 path = NULL;
 148         }
 149
 150         if (!font) {
 151                 // required font fields have not been set
 152                 return;
 153         }
 154
 155         if (((!text || !text[0]) && attrs->IsEmpty ())) {
 156                 // no glyphs to render
 157                 return;
 158         }
 159
 160         if (fill == NULL) {
 161                 // no fill specified (unlike TextBlock, there is no default brush)
 162                 return;
 163         }
 164
 165         // scale Advance, uOffset and vOffset units to pixels
 166         scale = round (size) / 100.0;
 167
 168         x0 = GetOriginX ();
 169         if (!ORIGIN_IS_SET (x0))
 170                 x0 = 0.0;
 171
 172         right = x0;
 173         left = x0;
 174
 175         // OriginY is the baseline if specified
 176         y0 = GetOriginY ();
 177         if (ORIGIN_IS_SET (y0)) {
 178                 top0 = y0 - font->Ascender ();
 179         } else {
 180                 y0 = font->Ascender ();
 181                 top0 = 0.0;
 182         }
 183
 184         bottom0 = top0 + font->Height ();
 185
 186         bottom = bottom0;
 187         top = top0;
 188
 189         path = moon_path_new (16);
 190
 191         attr = (GlyphAttr *) attrs->First ();
 192
 193         if (text && text[0]) {
 194                 gunichar *c = text;
 195
 196                 while (*c != 0) {
 197                         if (attr && (attr->set & Cluster)) {
 198                                 // get the cluster's GlyphCount and CodeUnitCount
 199                                 glyph_count = attr->glyph_count;
 200                                 code_units = attr->code_units;
 201                         } else {
 202                                 glyph_count = 1;
 203                                 code_units = 1;
 204                         }
 205
 206                         if (glyph_count == 1 && code_units == 1)
 207                                 cluster = false;
 208                         else
 209                                 cluster = true;
 210
 211                         // render the glyph cluster
 212                         i = 0;
 213                         do {
 214                                 if (attr && (attr->set & Index)) {
 215                                         if (!(glyph = font->GetGlyphInfoByIndex (attr->index)))
 216                                                 goto next1;
 217                                 } else if (cluster) {
 218                                         // indexes MUST be specified for each glyph in a cluster
 219                                         moon_path_destroy (path);
 220                                         invalid = true;
 221                                         path = NULL;
 222                                         return;
 223                                 } else {
 224                                         if (!(glyph = font->GetGlyphInfo (*c)))
 225                                                 goto next1;
 226                                 }
 227
 228                                 y1 = y0;
 229                                 if (attr && (attr->set & vOffset)) {
 230                                         offset = -(attr->voffset * scale);
 231                                         bottom = MAX (bottom, bottom0 + offset);
 232                                         top = MIN (top, top0 + offset);
 233                                         y1 += offset;
 234                                 }
 235
 236                                 if (attr && (attr->set & uOffset)) {
 237                                         offset = (attr->uoffset * scale);
 238                                         left = MIN (left, x0 + offset);
 239                                         x1 = x0 + offset;
 240                                 } else if (first_char) {
 241                                         if (glyph->metrics.horiBearingX < 0)
 242                                                 x0 -= glyph->metrics.horiBearingX;
 243
 244                                         first_char = false;
 245                                         x1 = x0;
 246                                 } else {
 247                                         x1 = x0;
 248                                 }
 249
 250                                 right = MAX (right, x1 + glyph->metrics.horiAdvance);
 251
 252                                 font->AppendPath (path, glyph, x1, y1);
 253                                 nglyphs++;
 254
 255                                 if (attr && (attr->set & Advance))
 256                                         x0 += attr->advance * scale;
 257                                 else
 258                                         x0 += glyph->metrics.horiAdvance;
 259
 260                          next1:
 261
 262                                 attr = attr ? (GlyphAttr *) attr->next : NULL;
 263                                 i++;
 264
 265                                 if (i == glyph_count)
 266                                         break;
 267
 268                                 if (!attr) {
 269                                         // there MUST be an attr for each glyph in a cluster
 270                                         moon_path_destroy (path);
 271                                         invalid = true;
 272                                         path = NULL;
 273                                         return;
 274                                 }
 275
 276                                 if ((attr->set & Cluster)) {
 277                                         // only the first glyph in a cluster may specify a cluster mapping
 278                                         moon_path_destroy (path);
 279                                         invalid = true;
 280                                         path = NULL;
 281                                         return;
 282                                 }
 283                         } while (true);
 284
 285                         // consume the code units
 286                         for (i = 0; i < code_units && *c != 0; i++)
 287                                 c++;
 288
 289                         n++;
 290                 }
 291         }
 292
 293         while (attr) {
 294                 if (attr->set & Cluster) {
 295                         LOG_TEXT (stderr, "Can't use clusters past the end of the UnicodeString\n");
 296                         moon_path_destroy (path);
 297                         invalid = true;
 298                         path = NULL;
 299                         return;
 300                 }
 301
 302                 if (!(attr->set & Index)) {
 303                         LOG_TEXT (stderr, "No index specified for glyph %d\n", n + 1);
 304                         moon_path_destroy (path);
 305                         invalid = true;
 306                         path = NULL;
 307                         return;
 308                 }
 309
 310                 if (!(glyph = font->GetGlyphInfoByIndex (attr->index)))
 311                         goto next;
 312
 313                 y1 = y0;
 314                 if ((attr->set & vOffset)) {
 315                         offset = -(attr->voffset * scale);
 316                         bottom = MAX (bottom, bottom0 + offset);
 317                         top = MIN (top, top0 + offset);
 318                         y1 += offset;
 319                 }
 320
 321                 if ((attr->set & uOffset)) {
 322                         offset = (attr->uoffset * scale);
 323                         left = MIN (left, x0 + offset);
 324                         x1 = x0 + offset;
 325                 } else if (first_char) {
 326                         if (glyph->metrics.horiBearingX < 0)
 327                                 x0 -= glyph->metrics.horiBearingX;
 328
 329                         first_char = false;
 330                         x1 = x0;
 331                 } else {
 332                         x1 = x0;
 333                 }
 334
 335                 right = MAX (right, x1 + glyph->metrics.horiAdvance);
 336
 337                 font->AppendPath (path, glyph, x1, y1);
 338                 nglyphs++;
 339
 340                 if ((attr->set & Advance))
 341                         x0 += attr->advance * scale;
 342                 else
 343                         x0 += glyph->metrics.horiAdvance;
 344
 345          next:
 346
 347                 attr = (GlyphAttr *) attr->next;
 348                 n++;
 349         }
 350
 351         if (nglyphs > 0) {
 352                 height = bottom - top;
 353                 width = right - left;
 354         } else {
 355                 moon_path_destroy (path);
 356                 path = NULL;
 357         }
 358 }
 359
 360 void
 361 Glyphs::GetSizeForBrush (cairo_t *cr, double *width, double *height)
 362 {
 363         if (dirty)
 364                 Layout ();
 365
 366         *height = this->height;
 367         *width = this->width;
 368 }
 369
 370 Point
 371 Glyphs::GetOriginPoint ()
 372 {
 373         double x0 = GetOriginX ();
 374         double y0 = GetOriginY ();
 375
 376         if (!ORIGIN_IS_SET (x0))
 377                 x0 = 0.0;
 378
 379         if (ORIGIN_IS_SET (y0)) {
 380                 double ascend = font ? font->Ascender () : 0.0;
 381
 382                 return Point (x0, y0 - ascend);
 383         } else {
 384                 return Point (x0, 0);
 385         }
 386 }
 387
 388 void
 389 Glyphs::Render (cairo_t *cr, Region *region, bool path_only)
 390 {
 391         if (width == 0.0 && height == 0.0)
 392                 return;
 393
 394         if (invalid) {
 395                 // do not render anything if our state is invalid to keep with Silverlight's behavior.
 396                 // (Note: rendering code also assumes everything is kosher)
 397                 return;
 398         }
 399
 400         if (path == NULL || path->cairo.num_data == 0) {
 401                 // No glyphs to render
 402                 return;
 403         }
 404
 405         cairo_save (cr);
 406         cairo_set_matrix (cr, &absolute_xform);
 407
 408         if (!path_only)
 409                 RenderLayoutClip (cr);
 410
 411         Rect area = Rect (left, top, width, height);
 412         fill->SetupBrush (cr, area);
 413
 414         cairo_append_path (cr, &path->cairo);
 415         fill->Fill (cr);
 416
 417         cairo_restore (cr);
 418 }
 419
 420 Size
 421 Glyphs::ComputeActualSize ()
 422 {
 423         if (dirty)
 424                 Layout ();
 425
 426         return Size (left + width, top + height);
 427 }
 428
 429 Size
 430 Glyphs::MeasureOverride (Size availableSize)
 431 {
 432         if (dirty)
 433                 Layout ();
 434
 435         return Size (left + width, top + height).Min (availableSize);
 436 }
 437
 438 Size
 439 Glyphs::ArrangeOverride (Size finalSize)
 440 {
 441         if (dirty)
 442                 Layout ();
 443
 444         finalSize = ApplySizeConstraints (finalSize);
 445         return Size (left + width, top + height).Max (finalSize);
 446 }
 447
 448 void
 449 Glyphs::ComputeBounds ()
 450 {
 451         if (dirty)
 452                 Layout ();
 453
 454         bounds = IntersectBoundsWithClipPath (Rect (left, top, width, height), false).Transform (&absolute_xform);
 455 }
 456
 457 bool
 458 Glyphs::InsideObject (cairo_t *cr, double x, double y)
 459 {
 460         double nx = x;
 461         double ny = y;
 462
 463         TransformPoint (&nx, &ny);
 464
 465         return (nx >= left && ny >= top && nx < left + width && ny < top + height);
 466 }
 467
 468 Point
 469 Glyphs::GetTransformOrigin ()
 470 {
 471         // Glyphs seems to always use 0,0 no matter what is specified in the RenderTransformOrigin nor the OriginX/Y points
 472         return Point (0,0);
 473 }
 474
 475 void
 476 Glyphs::OnSubPropertyChanged (DependencyProperty *prop, DependencyObject *obj, PropertyChangedEventArgs *subobj_args)
 477 {
 478         if (prop && prop->GetId () == Glyphs::FillProperty) {
 479                 Invalidate ();
 480         } else {
 481                 FrameworkElement::OnSubPropertyChanged (prop, obj, subobj_args);
 482         }
 483 }
 484
 485 void
 486 Glyphs::LoadFont (const Uri *uri, const char *path)
 487 {
 488         FontManager *manager = Deployment::GetCurrent ()->GetFontManager ();
 489         StyleSimulations simulate = GetStyleSimulations ();
 490         double size = GetFontRenderingEmSize ();
 491         char *resource;
 492         int index;
 493
 494         if (uri->GetFragment ()) {
 495                 if ((index = strtol (uri->GetFragment (), NULL, 10)) < 0 || index == G_MAXINT)
 496                         index = 0;
 497         } else {
 498                 index = 0;
 499         }
 500
 501         resource = uri->ToString ((UriToStringFlags) (UriHidePasswd | UriHideFragment | UriHideQuery));
 502         manager->AddResource (resource, path);
 503         font = TextFont::Load (resource, index, size, simulate);
 504         g_free (resource);
 505 }
 506
 507 void
 508 Glyphs::downloader_complete (EventObject *sender, EventArgs *calldata, gpointer closure)
 509 {
 510         ((Glyphs *) closure)->DownloaderComplete ();
 511 }
 512
 513 void
 514 Glyphs::DownloaderComplete ()
 515 {
 516         Uri *uri = GetFontUri ();
 517         char *filename;
 518
 519         delete font;
 520         font = NULL;
 521
 522         // get the downloaded file path
 523         if (!(filename = downloader->GetDownloadedFilename (NULL))) {
 524                 UpdateBounds (true);
 525                 Invalidate ();
 526                 dirty = true;
 527                 return;
 528         }
 529
 530         LoadFont (uri, filename);
 531         g_free (filename);
 532
 533         UpdateBounds (true);
 534         Invalidate ();
 535         dirty = true;
 536 }
 537
 538 #if DEBUG
 539 static void
 540 print_parse_error (const char *in, const char *where, const char *reason)
 541 {
 542         if (debug_flags & RUNTIME_DEBUG_TEXT) {
 543                 fprintf (stderr, "Glyph Indices parse error: \"%s\": %s\n", in, reason);
 544                 fprintf (stderr, "                            ");
 545                 for (int i = 0; i < (where - in); i++)
 546                         fputc (' ', stderr);
 547                 fprintf (stderr, "^\n");
 548         }
 549 }
 550 #endif
 551
 552 void
 553 Glyphs::SetIndicesInternal (const char *in)
 554 {
 555         register const char *inptr = in;
 556         GlyphAttr *glyph;
 557         double value;
 558         char *end;
 559         uint bit;
 560         int n;
 561
 562         attrs->Clear (true);
 563
 564         if (in == NULL)
 565                 return;
 566
 567         while (g_ascii_isspace (*inptr))
 568                 inptr++;
 569
 570         while (*inptr) {
 571                 glyph = new GlyphAttr ();
 572
 573                 while (g_ascii_isspace (*inptr))
 574                         inptr++;
 575
 576                 // check for a cluster
 577                 if (*inptr == '(') {
 578                         inptr++;
 579                         while (g_ascii_isspace (*inptr))
 580                                 inptr++;
 581
 582                         errno = 0;
 583                         glyph->code_units = strtoul (inptr, &end, 10);
 584                         if (glyph->code_units == 0 || (glyph->code_units == LONG_MAX && errno != 0)) {
 585                                 // invalid cluster
 586                                 d(print_parse_error (in, inptr, errno ? strerror (errno) : "invalid cluster mapping; CodeUnitCount cannot be 0"));
 587                                 delete glyph;
 588                                 return;
 589                         }
 590
 591                         inptr = end;
 592                         while (g_ascii_isspace (*inptr))
 593                                 inptr++;
 594
 595                         if (*inptr != ':') {
 596                                 // invalid cluster
 597                                 print_parse_error (in, inptr, "expected ':'");
 598                                 delete glyph;
 599                                 return;
 600                         }
 601
 602                         inptr++;
 603                         while (g_ascii_isspace (*inptr))
 604                                 inptr++;
 605
 606                         errno = 0;
 607                         glyph->glyph_count = strtoul (inptr, &end, 10);
 608                         if (glyph->glyph_count == 0 || (glyph->glyph_count == LONG_MAX && errno != 0)) {
 609                                 // invalid cluster
 610                                 d(print_parse_error (in, inptr, errno ? strerror (errno) : "invalid cluster mapping; GlyphCount cannot be 0"));
 611                                 delete glyph;
 612                                 return;
 613                         }
 614
 615                         inptr = end;
 616                         while (g_ascii_isspace (*inptr))
 617                                 inptr++;
 618
 619                         if (*inptr != ')') {
 620                                 // invalid cluster
 621                                 d(print_parse_error (in, inptr, "expected ')'"));
 622                                 delete glyph;
 623                                 return;
 624                         }
 625
 626                         glyph->set |= Cluster;
 627                         inptr++;
 628
 629                         while (g_ascii_isspace (*inptr))
 630                                 inptr++;
 631                 }
 632
 633                 if (*inptr >= '0' && *inptr <= '9') {
 634                         errno = 0;
 635                         glyph->index = strtoul (inptr, &end, 10);
 636                         if ((glyph->index == 0 || glyph->index == LONG_MAX) && errno != 0) {
 637                                 // invalid glyph index
 638                                 d(print_parse_error (in, inptr, strerror (errno)));
 639                                 delete glyph;
 640                                 return;
 641                         }
 642
 643                         glyph->set |= Index;
 644
 645                         inptr = end;
 646                         while (g_ascii_isspace (*inptr))
 647                                 inptr++;
 648                 }
 649
 650                 bit = (uint) Advance;
 651                 n = 0;
 652
 653                 while (*inptr == ',' && n < 3) {
 654                         inptr++;
 655                         while (g_ascii_isspace (*inptr))
 656                                 inptr++;
 657
 658                         if (*inptr != ',') {
 659                                 value = g_ascii_strtod (inptr, &end);
 660                                 if ((value == 0.0 || value == HUGE_VAL || value == -HUGE_VAL) && errno != 0) {
 661                                         // invalid advance or offset
 662                                         d(print_parse_error (in, inptr, strerror (errno)));
 663                                         delete glyph;
 664                                         return;
 665                                 }
 666                         } else {
 667                                 end = (char *) inptr;
 668                         }
 669
 670                         if (end > inptr) {
 671                                 switch ((GlyphAttrMask) bit) {
 672                                 case Advance:
 673                                         glyph->advance = value;
 674                                         glyph->set |= Advance;
 675                                         break;
 676                                 case uOffset:
 677                                         glyph->uoffset = value;
 678                                         glyph->set |= uOffset;
 679                                         break;
 680                                 case vOffset:
 681                                         glyph->voffset = value;
 682                                         glyph->set |= vOffset;
 683                                         break;
 684                                 default:
 685                                         break;
 686                                 }
 687                         }
 688
 689                         inptr = end;
 690                         while (g_ascii_isspace (*inptr))
 691                                 inptr++;
 692
 693                         bit <<= 1;
 694                         n++;
 695                 }
 696
 697                 attrs->Append (glyph);
 698
 699                 while (g_ascii_isspace (*inptr))
 700                         inptr++;
 701
 702                 if (*inptr && *inptr != ';') {
 703                         d(print_parse_error (in, inptr, "expected ';'"));
 704                         return;
 705                 }
 706
 707                 if (*inptr == '\0')
 708                         break;
 709
 710                 inptr++;
 711         }
 712 }
 713
 714 void
 715 Glyphs::DownloadFont (Surface *surface, Uri *uri)
 716 {
 717         if ((downloader = surface->CreateDownloader ())) {
 718                 char *str = uri->ToString (UriHideFragment);
 719                 downloader->Open ("GET", str, FontPolicy);
 720                 g_free (str);
 721
 722                 downloader->AddHandler (downloader->CompletedEvent, downloader_complete, this);
 723                 if (downloader->Started () || downloader->Completed ()) {
 724                         if (downloader->Completed ())
 725                                 DownloaderComplete ();
 726                 } else {
 727                         // This is what actually triggers the download
 728                         downloader->Send ();
 729                 }
 730         } else {
 731                 // we're shutting down
 732         }
 733 }
 734
 735 bool
 736 Glyphs::SetFontResource (const Uri *uri)
 737 {
 738         Application *application = Application::GetCurrent ();
 739         char *path;
 740
 741         if (!application || !(path = application->GetResourceAsPath (GetResourceBase(), uri)))
 742                 return false;
 743
 744         LoadFont (uri, path);
 745         g_free (path);
 746
 747         return true;
 748 }
 749
 750 void
 751 Glyphs::SetSurface (Surface *surface)
 752 {
 753         Uri *uri;
 754
 755         if (GetSurface () == surface)
 756                 return;
 757
 758         FrameworkElement::SetSurface (surface);
 759
 760         if (!uri_changed || !surface)
 761                 return;
 762
 763         if ((uri = GetFontUri ()))
 764                 DownloadFont (surface, uri);
 765
 766         uri_changed = false;
 767 }
 768
 769 void
 770 Glyphs::OnPropertyChanged (PropertyChangedEventArgs *args, MoonError *error)
 771 {
 772         bool invalidate = true;
 773
 774         if (args->GetProperty ()->GetOwnerType() != Type::GLYPHS) {
 775                 FrameworkElement::OnPropertyChanged (args, error);
 776                 return;
 777         }
 778
 779         if (args->GetId () == Glyphs::FontUriProperty) {
 780                 Uri *uri = args->GetNewValue() ? args->GetNewValue()->AsUri () : NULL;
 781                 Surface *surface = GetSurface ();
 782
 783                 CleanupDownloader ();
 784                 dirty = true;
 785                 delete font;
 786                 font = NULL;
 787
 788                 if (!Uri::IsNullOrEmpty (uri)) {
 789                         if (!SetFontResource (uri)) {
 790                                 // need to create a downloader for this font...
 791                                 if (surface) {
 792                                         DownloadFont (surface, uri);
 793                                         uri_changed = false;
 794                                 } else {
 795                                         // queue a font download
 796                                         uri_changed = true;
 797                                 }
 798                         } else {
 799                                 uri_changed = false;
 800                         }
 801                 } else {
 802                         uri_changed = false;
 803                 }
 804         } else if (args->GetId () == Glyphs::FillProperty) {
 805                 fill = args->GetNewValue() ? args->GetNewValue()->AsBrush() : NULL;
 806         } else if (args->GetId () == Glyphs::UnicodeStringProperty) {
 807                 const char *str = args->GetNewValue() ? args->GetNewValue()->AsString () : NULL;
 808                 g_free (text);
 809
 810                 if (str != NULL)
 811                         text = g_utf8_to_ucs4_fast (str, -1, NULL);
 812                 else
 813                         text = NULL;
 814
 815                 dirty = true;
 816         } else if (args->GetId () == Glyphs::IndicesProperty) {
 817                 const char *str = args->GetNewValue() ? args->GetNewValue()->AsString () : NULL;
 818                 SetIndicesInternal (str);
 819                 dirty = true;
 820         } else if (args->GetId () == Glyphs::FontRenderingEmSizeProperty) {
 821                 if (font != NULL)
 822                         dirty = font->SetSize (args->GetNewValue ()->AsDouble ());
 823                 else
 824                         dirty = true;
 825         } else if (args->GetId () == Glyphs::OriginXProperty) {
 826                 dirty = true;
 827         } else if (args->GetId () == Glyphs::OriginYProperty) {
 828                 dirty = true;
 829         } else if (args->GetId () == Glyphs::StyleSimulationsProperty) {
 830                 StyleSimulations simulate = (StyleSimulations) args->GetNewValue ()->AsInt32 ();
 831
 832                 // clear any unsupported flags
 833                 simulate = (StyleSimulations) (simulate & StyleSimulationsBoldItalic);
 834
 835                 if (font != NULL)
 836                         dirty = font->SetStyleSimulations (simulate);
 837                 else
 838                         dirty = true;
 839         }
 840
 841         if (invalidate)
 842                 Invalidate ();
 843
 844         if (dirty)
 845                 UpdateBounds (true);
 846
 847         NotifyListenersOfPropertyChange (args, error);
 848 }