synfig-core/trunk/src/synfig/valuenode.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file valuenode.cpp
   3 **      \brief Implementation of the "Placeholder" valuenode conversion.
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **      Copyright (c) 2007, 2008 Chris Moore
  10 **
  11 **      This package is free software; you can redistribute it and/or
  12 **      modify it under the terms of the GNU General Public License as
  13 **      published by the Free Software Foundation; either version 2 of
  14 **      the License, or (at your option) any later version.
  15 **
  16 **      This package is distributed in the hope that it will be useful,
  17 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19 **      General Public License for more details.
  20 **      \endlegal
  21 */
  22 /* ========================================================================= */
  23
  24 /* === H E A D E R S ======================================================= */
  25
  26 #define SYNFIG_NO_ANGLE
  27
  28 //#define HAS_HASH_MAP 1
  29
  30 #ifdef USING_PCH
  31 #       include "pch.h"
  32 #else
  33 #ifdef HAVE_CONFIG_H
  34 #       include <config.h>
  35 #endif
  36
  37 #include "valuenode.h"
  38 #include "general.h"
  39 #include "canvas.h"
  40 #include "paramdesc.h"
  41 #include "releases.h"
  42
  43 #include "valuenode_const.h"
  44 #include "valuenode_linear.h"
  45 #include "valuenode_composite.h"
  46 #include "valuenode_reference.h"
  47 #include "valuenode_scale.h"
  48 #include "valuenode_blinecalctangent.h"
  49 #include "valuenode_blinecalcvertex.h"
  50 #include "valuenode_blinecalcwidth.h"
  51 #include "valuenode_blinereversetangent.h"
  52 #include "valuenode_segcalctangent.h"
  53 #include "valuenode_segcalcvertex.h"
  54 #include "valuenode_repeat_gradient.h"
  55 #include "valuenode_stripes.h"
  56 #include "valuenode_range.h"
  57 #include "valuenode_add.h"
  58 #include "valuenode_subtract.h"
  59 #include "valuenode_timedswap.h"
  60 #include "valuenode_twotone.h"
  61 #include "valuenode_bline.h"
  62 #include "valuenode_dynamiclist.h"
  63 #include "valuenode_radialcomposite.h"
  64 #include "valuenode_gradientrotate.h"
  65 #include "valuenode_sine.h"
  66 #include "valuenode_cos.h"
  67 #include "valuenode_atan2.h"
  68 #include "valuenode_exp.h"
  69 #include "valuenode_switch.h"
  70 #include "valuenode_timeloop.h"
  71 #include "valuenode_reciprocal.h"
  72 #include "valuenode_duplicate.h"
  73 #include "valuenode_integer.h"
  74 #include "valuenode_step.h"
  75 #include "valuenode_vectorangle.h"
  76 #include "valuenode_vectorlength.h"
  77 #include "valuenode_vectorx.h"
  78 #include "valuenode_vectory.h"
  79 #include "valuenode_gradientcolor.h"
  80 #include "valuenode_dotproduct.h"
  81
  82 #include "layer.h"
  83
  84 #endif
  85
  86 /* === U S I N G =========================================================== */
  87
  88 using namespace std;
  89 using namespace etl;
  90 using namespace synfig;
  91
  92 /* === M A C R O S ========================================================= */
  93
  94 /* === G L O B A L S ======================================================= */
  95
  96 static int value_node_count(0);
  97
  98 static LinkableValueNode::Book *book_;
  99
 100
 101 ValueNode::LooseHandle
 102 synfig::find_value_node(const GUID& guid)
 103 {
 104         return guid_cast<ValueNode>(guid);
 105 }
 106
 107 /* === P R O C E D U R E S ================================================= */
 108
 109 /* === M E T H O D S ======================================================= */
 110
 111 bool
 112 ValueNode::subsys_init()
 113 {
 114         book_=new LinkableValueNode::Book();
 115
 116 #define ADD_VALUENODE(class,name,local,version)                                                                                                 \
 117         (*book_)[name].factory=reinterpret_cast<LinkableValueNode::Factory>(&class::create);            \
 118         (*book_)[name].check_type=&class::check_type;                                                                                           \
 119         (*book_)[name].local_name=local;                                                                                                                        \
 120         (*book_)[name].release_version=version
 121
 122 #define ADD_VALUENODE2(class,name,local,version)                                                                                                \
 123         (*book_)[name].factory=reinterpret_cast<LinkableValueNode::Factory>(&class::create_from);       \
 124         (*book_)[name].check_type=&class::check_type;                                                                                           \
 125         (*book_)[name].local_name=local;                                                                                                                        \
 126         (*book_)[name].release_version=version
 127
 128         ADD_VALUENODE(ValueNode_Linear,                   "linear",                       _("Linear"),                   RELEASE_VERSION_0_61_06);
 129         ADD_VALUENODE(ValueNode_Composite,                "composite",            _("Composite"),                RELEASE_VERSION_0_61_06);
 130         ADD_VALUENODE(ValueNode_RadialComposite,  "radial_composite", _("Radial Composite"), RELEASE_VERSION_0_61_06);
 131         ADD_VALUENODE(ValueNode_Reference,                "reference",            _("Reference"),                RELEASE_VERSION_0_61_06);
 132         ADD_VALUENODE(ValueNode_Scale,                    "scale",                        _("Scale"),                    RELEASE_VERSION_0_61_06);
 133         ADD_VALUENODE(ValueNode_SegCalcTangent,   "segcalctangent",       _("Segment Tangent"),  RELEASE_VERSION_0_61_06);
 134         ADD_VALUENODE(ValueNode_SegCalcVertex,    "segcalcvertex",        _("Segment Vertex"),   RELEASE_VERSION_0_61_06);
 135         ADD_VALUENODE(ValueNode_Stripes,                  "stripes",              _("Stripes"),                  RELEASE_VERSION_0_61_06);
 136         ADD_VALUENODE(ValueNode_Subtract,                 "subtract",             _("Subtract"),                 RELEASE_VERSION_0_61_06);
 137         ADD_VALUENODE(ValueNode_TwoTone,                  "twotone",              _("Two-Tone"),                 RELEASE_VERSION_0_61_06);
 138         ADD_VALUENODE(ValueNode_BLine,                    "bline",                        _("BLine"),                    RELEASE_VERSION_0_61_06);
 139         ADD_VALUENODE2(ValueNode_DynamicList,     "dynamic_list",         _("Dynamic List"),     RELEASE_VERSION_0_61_06);
 140         ADD_VALUENODE(ValueNode_GradientRotate,   "gradient_rotate",  _("Gradient Rotate"),      RELEASE_VERSION_0_61_06);
 141         ADD_VALUENODE(ValueNode_Sine,                     "sine",                         _("Sine"),                     RELEASE_VERSION_0_61_06);
 142
 143         ADD_VALUENODE(ValueNode_TimedSwap,                "timed_swap",           _("Timed Swap"),               RELEASE_VERSION_0_61_07); // SVN r610
 144         ADD_VALUENODE(ValueNode_Repeat_Gradient,  "repeat_gradient",  _("Repeat Gradient"),      RELEASE_VERSION_0_61_07); // SVN r666
 145         ADD_VALUENODE(ValueNode_Exp,                      "exp",                          _("Exponential"),              RELEASE_VERSION_0_61_07); // SVN r739
 146         ADD_VALUENODE(ValueNode_Add,                      "add",                          _("Add"),                              RELEASE_VERSION_0_61_07); // SVN r742
 147         ADD_VALUENODE(ValueNode_BLineCalcTangent, "blinecalctangent", _("BLine Tangent"),        RELEASE_VERSION_0_61_07); // SVN r744
 148         ADD_VALUENODE(ValueNode_BLineCalcVertex,  "blinecalcvertex",  _("BLine Vertex"),         RELEASE_VERSION_0_61_07); // SVN r744
 149         ADD_VALUENODE(ValueNode_Range,                    "range",                        _("Range"),                    RELEASE_VERSION_0_61_07); // SVN r776
 150
 151         ADD_VALUENODE(ValueNode_Switch,                   "switch",                       _("Switch"),                   RELEASE_VERSION_0_61_08); // SVN r923
 152         ADD_VALUENODE(ValueNode_Cos,                      "cos",                          _("Cos"),                              RELEASE_VERSION_0_61_08); // SVN r1111
 153         ADD_VALUENODE(ValueNode_Atan2,                    "atan2",                        _("aTan2"),                    RELEASE_VERSION_0_61_08); // SVN r1132
 154         ADD_VALUENODE(ValueNode_BLineRevTangent,  "blinerevtangent",  _("Reverse Tangent"),      RELEASE_VERSION_0_61_08); // SVN r1162
 155         ADD_VALUENODE(ValueNode_TimeLoop,                 "timeloop",             _("Time Loop"),                RELEASE_VERSION_0_61_08); // SVN r1226
 156         ADD_VALUENODE(ValueNode_Reciprocal,               "reciprocal",           _("Reciprocal"),               RELEASE_VERSION_0_61_08); // SVN r1238
 157         ADD_VALUENODE(ValueNode_Duplicate,                "duplicate",            _("Duplicate"),                RELEASE_VERSION_0_61_08); // SVN r1267
 158         ADD_VALUENODE(ValueNode_Integer,                  "fromint",              _("From Integer"),     RELEASE_VERSION_0_61_08); // SVN r1267
 159         ADD_VALUENODE(ValueNode_Step,                     "step",                         _("Step"),                     RELEASE_VERSION_0_61_08); // SVN r1691
 160         ADD_VALUENODE(ValueNode_BLineCalcWidth,   "blinecalcwidth",       _("BLine Width"),              RELEASE_VERSION_0_61_08); // SVN r1694
 161
 162         ADD_VALUENODE(ValueNode_VectorAngle,      "vectorangle",          _("Vector Angle"),     RELEASE_VERSION_0_61_09); // SVN r1880
 163         ADD_VALUENODE(ValueNode_VectorLength,     "vectorlength",         _("Vector Length"),    RELEASE_VERSION_0_61_09); // SVN r1881
 164         ADD_VALUENODE(ValueNode_VectorX,                  "vectorx",              _("Vector X"),                 RELEASE_VERSION_0_61_09); // SVN r1882
 165         ADD_VALUENODE(ValueNode_VectorY,                  "vectory",              _("Vector Y"),                 RELEASE_VERSION_0_61_09); // SVN r1882
 166         ADD_VALUENODE(ValueNode_GradientColor,    "gradientcolor",        _("Gradient Color"),   RELEASE_VERSION_0_61_09); // SVN r1885
 167         ADD_VALUENODE(ValueNode_DotProduct,               "dotproduct",           _("Dot Product"),              RELEASE_VERSION_0_61_09); // SVN r1891
 168
 169 #undef ADD_VALUENODE
 170 #undef ADD_VALUENODE2
 171
 172         return true;
 173 }
 174
 175 bool
 176 ValueNode::subsys_stop()
 177 {
 178         delete book_;
 179 /*      if(global_value_node_map.size() || value_node_count)
 180         {
 181                 if(value_node_count)
 182                         synfig::error("%d ValueNodes haven't been destroyed yet!",value_node_count);
 183
 184                 if(global_value_node_map.size()!=value_node_count)
 185                         synfig::error("value node count mismatch! map.size()!=value_node_count (%d!=%d)",global_value_node_map.size(),value_node_count);
 186
 187                 GlobalValueNodeMap::iterator iter;
 188                 for(iter=global_value_node_map.begin();iter!=global_value_node_map.end();++iter)
 189                 {
 190                         if(!iter->second->is_exported())
 191                                 synfig::info(_("%s: count:%d name:%s type:%s"),
 192                                         iter->first.get_string().c_str(),
 193                                         iter->second->count(),
 194                                         iter->second->get_name().c_str(),
 195                                         ValueBase::type_local_name(iter->second->get_type()).c_str()
 196                                 );
 197                         else
 198                                 synfig::info(_("%s: id:%s count:%d name:%s type:%s"),
 199                                         iter->first.get_string().c_str(),
 200                                         iter->second->get_id().c_str(),
 201                                         iter->second->count(),
 202                                         iter->second->get_name().c_str(),
 203                                         ValueBase::type_local_name(iter->second->get_type()).c_str()
 204                                 );
 205                 }
 206         }
 207 */
 208         return true;
 209 }
 210
 211 ValueNode::ValueNode(ValueBase::Type type):type(type)
 212 {
 213         value_node_count++;
 214 }
 215
 216 LinkableValueNode::Book&
 217 LinkableValueNode::book()
 218 {
 219         return *book_;
 220 }
 221
 222 LinkableValueNode::Handle
 223 LinkableValueNode::create(const String &name, const ValueBase& x)
 224 {
 225         if(!book().count(name))
 226                 return 0;
 227
 228         if (!check_type(name, x.get_type()) &&
 229                 // the Duplicate ValueNode is an exception - we don't want the
 230                 // user creating it for themselves, so check_type() fails for
 231                 // it even when it is valid
 232                 !(name == "duplicate" && x.get_type() == ValueBase::TYPE_REAL))
 233         {
 234                 error(_("Bad type: ValueNode '%s' doesn't accept type '%s'"), book()[name].local_name.c_str(), ValueBase::type_local_name(x.get_type()).c_str());
 235                 return 0;
 236         }
 237
 238         return book()[name].factory(x);
 239 }
 240
 241 bool
 242 LinkableValueNode::check_type(const String &name, ValueBase::Type x)
 243 {
 244         if(!book().count(name) || !book()[name].check_type)
 245                 return false;
 246         return book()[name].check_type(x);
 247 }
 248
 249 bool
 250 LinkableValueNode::set_link(int i,ValueNode::Handle x)
 251 {
 252         ValueNode::Handle previous(get_link(i));
 253
 254         if(set_link_vfunc(i,x))
 255         {
 256                 if(previous)
 257                         remove_child(previous.get());
 258                 add_child(x.get());
 259
 260                 if(!x->is_exported() && get_parent_canvas())
 261                 {
 262                         x->set_parent_canvas(get_parent_canvas());
 263                 }
 264                 changed();
 265                 return true;
 266         }
 267         return false;
 268 }
 269
 270 ValueNode::LooseHandle
 271 LinkableValueNode::get_link(int i)const
 272 {
 273         return get_link_vfunc(i);
 274 }
 275
 276 void
 277 LinkableValueNode::unlink_all()
 278 {
 279         for(int i=0;i<link_count();i++)
 280         {
 281                 ValueNode::LooseHandle value_node(get_link(i));
 282                 if(value_node)
 283                         value_node->parent_set.erase(this);
 284         }
 285 }
 286
 287 ValueNode::~ValueNode()
 288 {
 289         value_node_count--;
 290
 291         begin_delete();
 292 }
 293
 294 void
 295 ValueNode::on_changed()
 296 {
 297         etl::loose_handle<Canvas> parent_canvas = get_parent_canvas();
 298         if(parent_canvas)
 299                 do                                              // signal to all the ancestor canvases
 300                         parent_canvas->signal_value_node_changed()(this);
 301                 while (parent_canvas = parent_canvas->parent());
 302         else if(get_root_canvas())
 303                 get_root_canvas()->signal_value_node_changed()(this);
 304
 305         Node::on_changed();
 306 }
 307
 308 int
 309 ValueNode::replace(etl::handle<ValueNode> x)
 310 {
 311         if(x.get()==this)
 312                 return 0;
 313
 314         while(parent_set.size())
 315         {
 316                 (*parent_set.begin())->add_child(x.get());
 317                 (*parent_set.begin())->remove_child(this);
 318                 //x->parent_set.insert(*parent_set.begin());
 319                 //parent_set.erase(parent_set.begin());
 320         }
 321         int r(RHandle(this).replace(x));
 322         x->changed();
 323         return r;
 324 }
 325
 326 void
 327 ValueNode::set_id(const String &x)
 328 {
 329         if(name!=x)
 330         {
 331                 name=x;
 332                 signal_id_changed_();
 333         }
 334 }
 335
 336 String
 337 ValueNode::get_description(bool show_exported_name)const
 338 {
 339         String ret(_("ValueNode"));
 340
 341         if (dynamic_cast<const LinkableValueNode*>(this))
 342                 return (dynamic_cast<const LinkableValueNode*>(this))->get_description(-1, show_exported_name);
 343
 344         if (show_exported_name && !is_exported())
 345                 show_exported_name = false;
 346
 347         if (show_exported_name)
 348                 ret += strprintf(" (%s)", get_id().c_str());
 349
 350         return ret;
 351 }
 352
 353 ValueNodeList::ValueNodeList():
 354         placeholder_count_(0)
 355 {
 356 }
 357
 358 bool
 359 ValueNodeList::count(const String &id)const
 360 {
 361         const_iterator iter;
 362
 363         if(id.empty())
 364                 return false;
 365
 366         for(iter=begin();iter!=end() && id!=(*iter)->get_id();++iter)
 367                 ;
 368
 369         if(iter==end())
 370                 return false;
 371
 372         return true;
 373 }
 374
 375 ValueNode::Handle
 376 ValueNodeList::find(const String &id)
 377 {
 378         iterator iter;
 379
 380         if(id.empty())
 381                 throw Exception::IDNotFound("Empty ID");
 382
 383         for(iter=begin();iter!=end() && id!=(*iter)->get_id();++iter)
 384                 ;
 385
 386         if(iter==end())
 387                 throw Exception::IDNotFound("ValueNode in ValueNodeList: "+id);
 388
 389         return *iter;
 390 }
 391
 392 ValueNode::ConstHandle
 393 ValueNodeList::find(const String &id)const
 394 {
 395         const_iterator iter;
 396
 397         if(id.empty())
 398                 throw Exception::IDNotFound("Empty ID");
 399
 400         for(iter=begin();iter!=end() && id!=(*iter)->get_id();++iter)
 401                 ;
 402
 403         if(iter==end())
 404                 throw Exception::IDNotFound("ValueNode in ValueNodeList: "+id);
 405
 406         return *iter;
 407 }
 408
 409 ValueNode::Handle
 410 ValueNodeList::surefind(const String &id)
 411 {
 412         if(id.empty())
 413                 throw Exception::IDNotFound("Empty ID");
 414
 415         ValueNode::Handle value_node;
 416
 417         try
 418         {
 419                 value_node=find(id);
 420         }
 421         catch(Exception::IDNotFound)
 422         {
 423                 value_node=PlaceholderValueNode::create();
 424                 value_node->set_id(id);
 425                 push_back(value_node);
 426                 placeholder_count_++;
 427         }
 428
 429         return value_node;
 430 }
 431
 432 bool
 433 ValueNodeList::erase(ValueNode::Handle value_node)
 434 {
 435         assert(value_node);
 436
 437         iterator iter;
 438
 439         for(iter=begin();iter!=end();++iter)
 440                 if(value_node.get()==iter->get())
 441                 {
 442                         std::list<ValueNode::RHandle>::erase(iter);
 443                         if(PlaceholderValueNode::Handle::cast_dynamic(value_node))
 444                                 placeholder_count_--;
 445                         return true;
 446                 }
 447         return false;
 448 }
 449
 450 bool
 451 ValueNodeList::add(ValueNode::Handle value_node)
 452 {
 453         if(!value_node)
 454                 return false;
 455         if(value_node->get_id().empty())
 456                 return false;
 457
 458         try
 459         {
 460                 ValueNode::RHandle other_value_node=find(value_node->get_id());
 461                 if(PlaceholderValueNode::Handle::cast_dynamic(other_value_node))
 462                 {
 463                         other_value_node->replace(value_node);
 464                         placeholder_count_--;
 465                         return true;
 466                 }
 467
 468                 return false;
 469         }
 470         catch(Exception::IDNotFound)
 471         {
 472                 push_back(value_node);
 473                 return true;
 474         }
 475
 476         return false;
 477 }
 478
 479 void
 480 ValueNodeList::audit()
 481 {
 482         iterator iter,next;
 483
 484         for(next=begin(),iter=next++;iter!=end();iter=next++)
 485                 if(iter->count()==1)
 486                         std::list<ValueNode::RHandle>::erase(iter);
 487 }
 488
 489
 490 String
 491 PlaceholderValueNode::get_name()const
 492 {
 493         return "placeholder";
 494 }
 495
 496 String
 497 PlaceholderValueNode::get_local_name()const
 498 {
 499         return _("Placeholder");
 500 }
 501
 502 ValueNode*
 503 PlaceholderValueNode::clone(const GUID& deriv_guid)const
 504 {
 505         ValueNode* ret(new PlaceholderValueNode());
 506         ret->set_guid(get_guid()^deriv_guid);
 507         return ret;
 508 }
 509
 510 PlaceholderValueNode::Handle
 511 PlaceholderValueNode::create(ValueBase::Type type)
 512 {
 513         return new PlaceholderValueNode(type);
 514 }
 515
 516 ValueBase
 517 PlaceholderValueNode::operator()(Time /*t*/)const
 518 {
 519         assert(0);
 520         return ValueBase();
 521 }
 522
 523 PlaceholderValueNode::PlaceholderValueNode(ValueBase::Type type):
 524         ValueNode(type)
 525 {
 526 }
 527
 528 ValueNode*
 529 LinkableValueNode::clone(const GUID& deriv_guid)const
 530 {
 531         {
 532                 ValueNode* x(find_value_node(get_guid()^deriv_guid).get());
 533                 if(x)
 534                         return x;
 535         }
 536
 537         int i;
 538         LinkableValueNode *ret=create_new();
 539         ret->set_guid(get_guid()^deriv_guid);
 540
 541         for(i=0;i<link_count();i++)
 542         {
 543                 ValueNode::Handle link=get_link_vfunc(i);
 544                 if(!link->is_exported())
 545                 {
 546                         ValueNode::LooseHandle value_node(find_value_node(link->get_guid()^deriv_guid));
 547                         if(!value_node)
 548                                 value_node=link->clone(deriv_guid);
 549                         ret->set_link(i,value_node);
 550                 }
 551                 else
 552                         ret->set_link(i,link);
 553         }
 554
 555         return ret;
 556 }
 557
 558 String
 559 ValueNode::get_relative_id(etl::loose_handle<const Canvas> x)const
 560 {
 561         assert(is_exported());
 562         assert(canvas_);
 563
 564         if(x.get()==canvas_.get())
 565                 return get_id();
 566
 567         return canvas_->_get_relative_id(x)+':'+get_id();
 568 }
 569
 570 void
 571 ValueNode::set_parent_canvas(etl::loose_handle<Canvas> x)
 572 {
 573         canvas_=x; if(x) root_canvas_=x->get_root();
 574 }
 575
 576 void
 577 ValueNode::set_root_canvas(etl::loose_handle<Canvas> x)
 578 {
 579         root_canvas_=x->get_root();
 580 }
 581
 582 void LinkableValueNode::get_times_vfunc(Node::time_set &set) const
 583 {
 584         ValueNode::LooseHandle  h;
 585
 586         int size = link_count();
 587
 588         //just add it to the set...
 589         for(int i=0; i < size; ++i)
 590         {
 591                 h = get_link(i);
 592
 593                 if(h)
 594                 {
 595                         const Node::time_set &tset = h->get_times();
 596                         set.insert(tset.begin(),tset.end());
 597                 }
 598         }
 599 }
 600
 601 String
 602 LinkableValueNode::get_description(int index, bool show_exported_name)const
 603 {
 604         String description;
 605
 606         if (index == -1)
 607         {
 608                 if (show_exported_name && is_exported())
 609                         description += strprintf(" (%s)", get_id().c_str());
 610         }
 611         else
 612         {
 613                 description = String(":") + link_local_name(index);
 614
 615                 if (show_exported_name)
 616                 {
 617                         ValueNode::LooseHandle link(get_link(index));
 618                         if (link->is_exported())
 619                                 description += strprintf(" (%s)", link->get_id().c_str());
 620                 }
 621         }
 622
 623         const synfig::Node* node = this;
 624         LinkableValueNode::ConstHandle parent_linkable_vn = 0;
 625
 626         // walk up through the valuenodes trying to find the layer at the top
 627         while (!node->parent_set.empty() && !dynamic_cast<const Layer*>(node))
 628         {
 629                 LinkableValueNode::ConstHandle linkable_value_node(dynamic_cast<const LinkableValueNode*>(node));
 630                 if (linkable_value_node)
 631                 {
 632                         String link;
 633                         int cnt = linkable_value_node->link_count();
 634                         for (int i = 0; i < cnt; i++)
 635                                 if (linkable_value_node->get_link(i) == parent_linkable_vn)
 636                                 {
 637                                         link = String(":") + linkable_value_node->link_local_name(i);
 638                                         break;
 639                                 }
 640
 641                         description = linkable_value_node->get_local_name() + link + (parent_linkable_vn?">":"") + description;
 642                 }
 643                 node = *node->parent_set.begin();
 644                 parent_linkable_vn = linkable_value_node;
 645         }
 646
 647         Layer::ConstHandle parent_layer(dynamic_cast<const Layer*>(node));
 648         if(parent_layer)
 649         {
 650                 String param;
 651                 const Layer::DynamicParamList &dynamic_param_list(parent_layer->dynamic_param_list());
 652                 // loop to find the parameter in the dynamic parameter list - this gives us its name
 653                 for (Layer::DynamicParamList::const_iterator iter = dynamic_param_list.begin(); iter != dynamic_param_list.end(); iter++)
 654                         if (iter->second == parent_linkable_vn)
 655                                 param = String(":") + parent_layer->get_param_local_name(iter->first);
 656                 description = strprintf("(%s)%s>%s",
 657                                                                 parent_layer->get_non_empty_description().c_str(),
 658                                                                 param.c_str(),
 659                                                                 description.c_str());
 660         }
 661
 662         return description;
 663 }