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

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file savecanvas.cpp
   3 **      \brief Writeme
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **
  10 **      This package is free software; you can redistribute it and/or
  11 **      modify it under the terms of the GNU General Public License as
  12 **      published by the Free Software Foundation; either version 2 of
  13 **      the License, or (at your option) any later version.
  14 **
  15 **      This package is distributed in the hope that it will be useful,
  16 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18 **      General Public License for more details.
  19 **      \endlegal
  20 */
  21 /* ========================================================================= */
  22
  23 /* === H E A D E R S ======================================================= */
  24
  25 #ifdef USING_PCH
  26 #       include "pch.h"
  27 #else
  28 #ifdef HAVE_CONFIG_H
  29 #       include <config.h>
  30 #endif
  31
  32 #ifdef HAVE_SYS_ERRNO_H
  33 #       include <sys/errno.h>
  34 #endif
  35
  36 #include "savecanvas.h"
  37 #include "general.h"
  38 #include "valuenode.h"
  39 #include "valuenode_subtract.h"
  40 #include "valuenode_animated.h"
  41 #include "valuenode_composite.h"
  42 #include "valuenode_const.h"
  43 #include "valuenode_linear.h"
  44 #include "valuenode_dynamiclist.h"
  45 #include "valuenode_reference.h"
  46 #include "valuenode_segcalctangent.h"
  47 #include "valuenode_segcalcvertex.h"
  48 #include "valuenode_bline.h"
  49 #include "time.h"
  50 #include "keyframe.h"
  51 #include "layer.h"
  52 #include "string.h"
  53 #include "paramdesc.h"
  54
  55 #include <libxml++/libxml++.h>
  56 #include <ETL/stringf>
  57 #include "gradient.h"
  58 #include <errno.h>
  59
  60 #endif
  61
  62 /* === U S I N G =========================================================== */
  63
  64 using namespace std;
  65 using namespace etl;
  66 using namespace synfig;
  67
  68 /* === M A C R O S ========================================================= */
  69
  70 #define COLOR_VALUE_TYPE_FORMAT         "%f"
  71 #define VECTOR_VALUE_TYPE_FORMAT        "%0.10f"
  72 #define TIME_TYPE_FORMAT                        "%0.3f"
  73 #define VIEW_BOX_FORMAT                         "%f %f %f %f"
  74
  75 /* === G L O B A L S ======================================================= */
  76
  77 /* === P R O C E D U R E S ================================================= */
  78
  79 xmlpp::Element* encode_canvas(xmlpp::Element* root,Canvas::ConstHandle canvas);
  80 xmlpp::Element* encode_value_node(xmlpp::Element* root,ValueNode::ConstHandle value_node,Canvas::ConstHandle canvas);
  81
  82 xmlpp::Element* encode_keyframe(xmlpp::Element* root,const Keyframe &kf, float fps)
  83 {
  84         root->set_name("keyframe");
  85         root->set_attribute("time",kf.get_time().get_string(fps));
  86         if(!kf.get_description().empty())
  87                 root->set_child_text(kf.get_description());
  88         return root;
  89 }
  90
  91
  92 xmlpp::Element* encode_real(xmlpp::Element* root,Real v)
  93 {
  94         root->set_name("real");
  95         root->set_attribute("value",strprintf(VECTOR_VALUE_TYPE_FORMAT,v));
  96         return root;
  97 }
  98
  99 xmlpp::Element* encode_time(xmlpp::Element* root,Time t, float fps=0)
 100 {
 101         root->set_name("time");
 102         //root->set_attribute("value",t.get_string(fps));
 103         root->set_attribute("value",t.get_string());
 104         return root;
 105 }
 106
 107 xmlpp::Element* encode_integer(xmlpp::Element* root,int i)
 108 {
 109         root->set_name("integer");
 110         root->set_attribute("value",strprintf("%i",i));
 111         return root;
 112 }
 113
 114 xmlpp::Element* encode_bool(xmlpp::Element* root,bool b)
 115 {
 116         root->set_name("bool");
 117         root->set_attribute("value",b?"true":"false");
 118         return root;
 119 }
 120
 121 xmlpp::Element* encode_string(xmlpp::Element* root,const String &str)
 122 {
 123         root->set_name("string");
 124         root->set_child_text(str);
 125         return root;
 126 }
 127
 128 xmlpp::Element* encode_vector(xmlpp::Element* root,Vector vect)
 129 {
 130         root->set_name("vector");
 131         root->add_child("x")->set_child_text(strprintf(VECTOR_VALUE_TYPE_FORMAT,(float)vect[0]));
 132         root->add_child("y")->set_child_text(strprintf(VECTOR_VALUE_TYPE_FORMAT,(float)vect[1]));
 133         return root;
 134 }
 135
 136 xmlpp::Element* encode_color(xmlpp::Element* root,Color color)
 137 {
 138         root->set_name("color");
 139         root->add_child("r")->set_child_text(strprintf(COLOR_VALUE_TYPE_FORMAT,(float)color.get_r()));
 140         root->add_child("g")->set_child_text(strprintf(COLOR_VALUE_TYPE_FORMAT,(float)color.get_g()));
 141         root->add_child("b")->set_child_text(strprintf(COLOR_VALUE_TYPE_FORMAT,(float)color.get_b()));
 142         root->add_child("a")->set_child_text(strprintf(COLOR_VALUE_TYPE_FORMAT,(float)color.get_a()));
 143         return root;
 144 }
 145
 146 xmlpp::Element* encode_angle(xmlpp::Element* root,Angle theta)
 147 {
 148         root->set_name("angle");
 149         root->set_attribute("value",strprintf("%f",(float)Angle::deg(theta).get()));
 150         return root;
 151 }
 152
 153 xmlpp::Element* encode_segment(xmlpp::Element* root,Segment seg)
 154 {
 155         root->set_name("segment");
 156         encode_vector(root->add_child("p1")->add_child("vector"),seg.p1);
 157         encode_vector(root->add_child("t1")->add_child("vector"),seg.t1);
 158         encode_vector(root->add_child("p2")->add_child("vector"),seg.p2);
 159         encode_vector(root->add_child("t2")->add_child("vector"),seg.t2);
 160         return root;
 161 }
 162
 163 xmlpp::Element* encode_bline_point(xmlpp::Element* root,BLinePoint bline_point)
 164 {
 165         root->set_name(ValueBase::type_name(ValueBase::TYPE_BLINEPOINT));
 166
 167         encode_vector(root->add_child("vertex")->add_child("vector"),bline_point.get_vertex());
 168         encode_vector(root->add_child("t1")->add_child("vector"),bline_point.get_tangent1());
 169
 170         if(bline_point.get_split_tangent_flag())
 171                 encode_vector(root->add_child("t2")->add_child("vector"),bline_point.get_tangent2());
 172
 173         encode_real(root->add_child("width")->add_child("real"),bline_point.get_width());
 174         encode_real(root->add_child("origin")->add_child("real"),bline_point.get_origin());
 175         return root;
 176 }
 177
 178 xmlpp::Element* encode_gradient(xmlpp::Element* root,Gradient x)
 179 {
 180         root->set_name("gradient");
 181
 182         Gradient::const_iterator iter;
 183         x.sort();
 184         for(iter=x.begin();iter!=x.end();iter++)
 185         {
 186                 xmlpp::Element *cpoint(encode_color(root->add_child("color"),iter->color));
 187                 cpoint->set_attribute("pos",strprintf("%f",iter->pos));
 188         }
 189         return root;
 190 }
 191
 192
 193 xmlpp::Element* encode_value(xmlpp::Element* root,const ValueBase &data,Canvas::ConstHandle canvas=0);
 194
 195 xmlpp::Element* encode_list(xmlpp::Element* root,std::list<ValueBase> list, Canvas::ConstHandle canvas=0)
 196 {
 197         root->set_name("list");
 198
 199         while(!list.empty())
 200         {
 201                 encode_value(root->add_child("value"),list.front(),canvas);
 202                 list.pop_front();
 203         }
 204
 205         return root;
 206 }
 207
 208 xmlpp::Element* encode_value(xmlpp::Element* root,const ValueBase &data,Canvas::ConstHandle canvas)
 209 {
 210         switch(data.get_type())
 211         {
 212         case ValueBase::TYPE_REAL:
 213                 return encode_real(root,data.get(Real()));
 214         case ValueBase::TYPE_TIME:
 215                 if(canvas)
 216                         return encode_time(root,data.get(Time()),canvas->rend_desc().get_frame_rate());
 217                 else
 218                         return encode_time(root,data.get(Time()));
 219         case ValueBase::TYPE_INTEGER:
 220                 return encode_integer(root,data.get(int()));
 221         case ValueBase::TYPE_COLOR:
 222                 return encode_color(root,data.get(Color()));
 223         case ValueBase::TYPE_VECTOR:
 224                 return encode_vector(root,data.get(Vector()));
 225         case ValueBase::TYPE_ANGLE:
 226                 return encode_angle(root,data.get(Angle()));
 227         case ValueBase::TYPE_BOOL:
 228                 return encode_bool(root,data.get(bool()));
 229         case ValueBase::TYPE_STRING:
 230                 return encode_string(root,data.get(String()));
 231         case ValueBase::TYPE_SEGMENT:
 232                 return encode_segment(root,data.get(Segment()));
 233         case ValueBase::TYPE_BLINEPOINT:
 234                 return encode_bline_point(root,data.get(BLinePoint()));
 235         case ValueBase::TYPE_GRADIENT:
 236                 return encode_gradient(root,data.get(Gradient()));
 237         case ValueBase::TYPE_LIST:
 238                 return encode_list(root,data,canvas);
 239         case ValueBase::TYPE_CANVAS:
 240                 return encode_canvas(root,data.get(Canvas::Handle()).get());
 241         case ValueBase::TYPE_NIL:
 242                 synfig::error("Encountered NIL ValueBase");
 243                 root->set_name("nil");
 244                 return root;
 245         default:
 246                 synfig::error(strprintf("Unknown value(%s), cannot create XML representation!",ValueBase::type_name(data.get_type()).c_str()));
 247                 root->set_name("nil");
 248                 return root;
 249         }
 250 }
 251
 252 xmlpp::Element* encode_animated(xmlpp::Element* root,ValueNode_Animated::ConstHandle value_node,Canvas::ConstHandle canvas=0)
 253 {
 254         assert(value_node);
 255         root->set_name("animated");
 256
 257         root->set_attribute("type",ValueBase::type_name(value_node->get_type()));
 258
 259         const ValueNode_Animated::WaypointList &waypoint_list=value_node->waypoint_list();
 260         ValueNode_Animated::WaypointList::const_iterator iter;
 261
 262         for(iter=waypoint_list.begin();iter!=waypoint_list.end();++iter)
 263         {
 264                 xmlpp::Element *waypoint_node=root->add_child("waypoint");
 265                 //waypoint_node->set_attribute("time",iter->get_time().get_string(canvas->rend_desc().get_frame_rate()));
 266                 waypoint_node->set_attribute("time",iter->get_time().get_string());
 267
 268                 //waypoint_node->add_child(encode_value(iter->get_value(),canvas));
 269                 if(iter->get_value_node()->is_exported())
 270                         waypoint_node->set_attribute("use",iter->get_value_node()->get_relative_id(canvas));
 271                 else
 272                         encode_value_node(waypoint_node->add_child("value_node"),iter->get_value_node(),canvas);
 273
 274                 switch(iter->get_before())
 275                 {
 276                 case INTERPOLATION_HALT:
 277                         waypoint_node->set_attribute("before","halt");
 278                         break;
 279                 case INTERPOLATION_LINEAR:
 280                         waypoint_node->set_attribute("before","linear");
 281                         break;
 282                 case INTERPOLATION_MANUAL:
 283                         waypoint_node->set_attribute("before","manual");
 284                         break;
 285                 case INTERPOLATION_CONSTANT:
 286                         waypoint_node->set_attribute("before","constant");
 287                         break;
 288                 case INTERPOLATION_TCB:
 289                         // This is the default value, so don't add a new attribute
 290                         break;
 291                 default:
 292                         error("Unknown waypoint type for \"before\" attribute");
 293                 }
 294
 295                 switch(iter->get_after())
 296                 {
 297                 case INTERPOLATION_HALT:
 298                         waypoint_node->set_attribute("after","halt");
 299                         break;
 300                 case INTERPOLATION_LINEAR:
 301                         waypoint_node->set_attribute("after","linear");
 302                         break;
 303                 case INTERPOLATION_MANUAL:
 304                         waypoint_node->set_attribute("after","manual");
 305                         break;
 306                 case INTERPOLATION_CONSTANT:
 307                         waypoint_node->set_attribute("after","constant");
 308                         break;
 309                 case INTERPOLATION_TCB:
 310                         // This is the default value, so don't add a new attribute
 311                         break;
 312                 default:
 313                         error("Unknown waypoint type for \"before\" attribute");
 314                 }
 315
 316                 if(iter->get_tension()!=0.0)
 317                         waypoint_node->set_attribute("tension",strprintf("%f",iter->get_tension()));
 318                 if(iter->get_time_tension()!=0.0)
 319                         waypoint_node->set_attribute("temporal-tension",strprintf("%f",iter->get_time_tension()));
 320                 if(iter->get_continuity()!=0.0)
 321                         waypoint_node->set_attribute("continuity",strprintf("%f",iter->get_continuity()));
 322                 if(iter->get_bias()!=0.0)
 323                         waypoint_node->set_attribute("bias",strprintf("%f",iter->get_bias()));
 324
 325         }
 326
 327         return root;
 328 }
 329
 330 xmlpp::Element* encode_composite(xmlpp::Element* root,ValueNode_Composite::ConstHandle value_node,Canvas::ConstHandle canvas=0)
 331 {
 332         assert(value_node);
 333         root->set_name("composite");
 334
 335         root->set_attribute("type",ValueBase::type_name(value_node->get_type()));
 336
 337         int i;
 338         for(i=0;i<value_node->link_count();i++)
 339         {
 340                 string name(strprintf("c%d",i+1));
 341                 assert(value_node->get_link(i));
 342                 if(value_node->get_link(i)->is_exported())
 343                         root->set_attribute(name,value_node->get_link(i)->get_relative_id(canvas));
 344                 else
 345                         encode_value_node(root->add_child(name)->add_child("value_node"),value_node->get_link(i).constant(),canvas);
 346         }
 347
 348         return root;
 349 }
 350
 351 xmlpp::Element* encode_subtract(xmlpp::Element* root,ValueNode_Subtract::ConstHandle value_node,Canvas::ConstHandle canvas=0)
 352 {
 353         assert(value_node);
 354         root->set_name("subtract");
 355
 356         ValueNode::ConstHandle lhs=value_node->get_lhs();
 357         ValueNode::ConstHandle rhs=value_node->get_rhs();
 358         ValueNode::ConstHandle scalar=value_node->get_scalar();
 359
 360         assert(lhs);
 361         assert(rhs);
 362
 363         root->set_attribute("type",ValueBase::type_name(value_node->get_type()));
 364
 365         if(lhs==rhs)
 366                 warning("LHS is equal to RHS, this <subtract> will always be zero!");
 367
 368         //if(value_node->get_scalar()!=1)
 369         //      root->set_attribute("scalar",strprintf(VECTOR_VALUE_TYPE_FORMAT,value_node->get_scalar()));
 370
 371         if(!scalar->get_id().empty())
 372                 root->set_attribute("scalar",scalar->get_relative_id(canvas));
 373         else
 374                 encode_value_node(root->add_child("scalar")->add_child("value_node"),scalar,canvas);
 375
 376         if(!lhs->get_id().empty())
 377                 root->set_attribute("lhs",lhs->get_relative_id(canvas));
 378         else
 379                 encode_value_node(root->add_child("lhs")->add_child("value_node"),lhs,canvas);
 380
 381         if(!rhs->get_id().empty())
 382                 root->set_attribute("rhs",rhs->get_relative_id(canvas));
 383         else
 384                 encode_value_node(root->add_child("rhs")->add_child("value_node"),rhs,canvas);
 385
 386         return root;
 387 }
 388
 389 xmlpp::Element* encode_dynamic_list(xmlpp::Element* root,ValueNode_DynamicList::ConstHandle value_node,Canvas::ConstHandle canvas=0)
 390 {
 391         assert(value_node);
 392         const float fps(canvas?canvas->rend_desc().get_frame_rate():0);
 393
 394         root->set_name(value_node->get_name());
 395
 396         root->set_attribute("type",ValueBase::type_name(value_node->get_contained_type()));
 397
 398         vector<ValueNode_DynamicList::ListEntry>::const_iterator iter;
 399
 400         ValueNode_BLine::ConstHandle bline_value_node(ValueNode_BLine::ConstHandle::cast_dynamic(value_node));
 401
 402         if(bline_value_node)
 403         {
 404                 if(bline_value_node->get_loop())
 405                         root->set_attribute("loop","true");
 406                 else
 407                         root->set_attribute("loop","false");
 408         }
 409
 410         for(iter=value_node->list.begin();iter!=value_node->list.end();++iter)
 411         {
 412                 xmlpp::Element  *entry_node=root->add_child("entry");
 413                 assert(iter->value_node);
 414                 if(!iter->value_node->get_id().empty())
 415                         entry_node->set_attribute("use",iter->value_node->get_relative_id(canvas));
 416                 else
 417                         encode_value_node(entry_node->add_child("value_node"),iter->value_node,canvas);
 418
 419                 // process waypoints
 420                 {
 421                         typedef synfig::ValueNode_DynamicList::ListEntry::Activepoint Activepoint;
 422                         typedef synfig::ValueNode_DynamicList::ListEntry::ActivepointList ActivepointList;
 423                         String begin_sequence;
 424                         String end_sequence;
 425
 426                         const ActivepointList& timing_info(iter->timing_info);
 427                         ActivepointList::const_iterator entry_iter;
 428
 429                         for(entry_iter=timing_info.begin();entry_iter!=timing_info.end();++entry_iter)
 430                                 if(entry_iter->state==true)
 431                                 {
 432                                         if(entry_iter->priority)
 433                                         {
 434                                                 printf("begin priority is %d\n", entry_iter->priority);
 435                                                 begin_sequence+=strprintf("p%d ",entry_iter->priority);
 436                                         }
 437                                         begin_sequence+=entry_iter->time.get_string(fps)+", ";
 438                                 }
 439                                 else
 440                                 {
 441                                         if(entry_iter->priority)
 442                                         {
 443                                                 printf("end priority is %d\n", entry_iter->priority);
 444                                                 end_sequence+=strprintf("p%d ",entry_iter->priority);
 445                                         }
 446                                         end_sequence+=entry_iter->time.get_string(fps)+", ";
 447                                 }
 448
 449                         // If this is just a plane-jane vanilla entry,
 450                         // then don't bother with begins and ends
 451                         if(end_sequence.empty() && begin_sequence=="SOT, ")
 452                                 begin_sequence.clear();
 453
 454                         if(!begin_sequence.empty())
 455                         {
 456                                 // Remove the last ", " stuff
 457                                 begin_sequence=String(begin_sequence.begin(),begin_sequence.end()-2);
 458                                 // Add the attribute
 459                                 entry_node->set_attribute("on",begin_sequence);
 460                         }
 461
 462                         if(!end_sequence.empty())
 463                         {
 464                                 // Remove the last ", " stuff
 465                                 end_sequence=String(end_sequence.begin(),end_sequence.end()-2);
 466                                 // Add the attribute
 467                                 entry_node->set_attribute("off",end_sequence);
 468                         }
 469                 }
 470         }
 471
 472         return root;
 473 }
 474
 475 // Generic linkable data node entry
 476 xmlpp::Element* encode_linkable_value_node(xmlpp::Element* root,LinkableValueNode::ConstHandle value_node,Canvas::ConstHandle canvas=0)
 477 {
 478         assert(value_node);
 479         root->set_name(value_node->get_name());
 480
 481         root->set_attribute("type",ValueBase::type_name(value_node->get_type()));
 482
 483         int i;
 484         for(i=0;i<value_node->link_count();i++)
 485         {
 486                 ValueNode::ConstHandle link=value_node->get_link(i).constant();
 487                 if(!link)
 488                         throw runtime_error("Bad link");
 489                 if(link->is_exported())
 490                         root->set_attribute(value_node->link_name(i),link->get_relative_id(canvas));
 491                 else
 492                         encode_value_node(root->add_child(value_node->link_name(i))->add_child("value_node"),link,canvas);
 493         }
 494
 495         return root;
 496 }
 497
 498 xmlpp::Element* encode_value_node(xmlpp::Element* root,ValueNode::ConstHandle value_node,Canvas::ConstHandle canvas)
 499 {
 500         assert(value_node);
 501
 502         if(ValueNode_Animated::ConstHandle::cast_dynamic(value_node))
 503                 encode_animated(root,ValueNode_Animated::ConstHandle::cast_dynamic(value_node),canvas);
 504         else
 505         if(ValueNode_Composite::ConstHandle::cast_dynamic(value_node))
 506                 encode_composite(root,ValueNode_Composite::ConstHandle::cast_dynamic(value_node),canvas);
 507         else
 508         if(ValueNode_Subtract::ConstHandle::cast_dynamic(value_node))
 509                 encode_subtract(root,ValueNode_Subtract::ConstHandle::cast_dynamic(value_node),canvas);
 510         else
 511         if(ValueNode_DynamicList::ConstHandle::cast_dynamic(value_node))
 512                 encode_dynamic_list(root,ValueNode_DynamicList::ConstHandle::cast_dynamic(value_node),canvas);
 513         else if(ValueNode_Const::ConstHandle::cast_dynamic(value_node))
 514         {
 515                 encode_value(root,ValueNode_Const::ConstHandle::cast_dynamic(value_node)->get_value(),canvas);
 516         }
 517         else
 518         if(LinkableValueNode::ConstHandle::cast_dynamic(value_node))
 519                 encode_linkable_value_node(root,LinkableValueNode::ConstHandle::cast_dynamic(value_node),canvas);
 520         else
 521         {
 522                 error(_("Unknown ValueNode Type (%s), cannot create an XML representation"),value_node->get_local_name().c_str());
 523                 root->set_name("nil");
 524         }
 525
 526         assert(root);
 527
 528         if(!value_node->get_id().empty())
 529                 root->set_attribute("id",value_node->get_id());
 530
 531         if(value_node->rcount()>1)
 532                 root->set_attribute("guid",(value_node->get_guid()^canvas->get_root()->get_guid()).get_string());
 533
 534         return root;
 535 }
 536
 537 xmlpp::Element* encode_layer(xmlpp::Element* root,Layer::ConstHandle layer)
 538 {
 539         root->set_name("layer");
 540
 541         root->set_attribute("type",layer->get_name());
 542         root->set_attribute("active",layer->active()?"true":"false");
 543
 544         if(!layer->get_version().empty())
 545                 root->set_attribute("version",layer->get_version());
 546         if(!layer->get_description().empty())
 547                 root->set_attribute("desc",layer->get_description());
 548         if(!layer->get_group().empty())
 549                 root->set_attribute("group",layer->get_group());
 550
 551         Layer::Vocab vocab(layer->get_param_vocab());
 552         Layer::Vocab::const_iterator iter;
 553
 554         const Layer::DynamicParamList &dynamic_param_list=layer->dynamic_param_list();
 555
 556         for(iter=vocab.begin();iter!=vocab.end();++iter)
 557         {
 558                 // Handle dynamic parameters
 559                 if(dynamic_param_list.count(iter->get_name()))
 560                 {
 561                         xmlpp::Element *node=root->add_child("param");
 562                         node->set_attribute("name",iter->get_name());
 563
 564                         handle<const ValueNode> value_node=dynamic_param_list.find(iter->get_name())->second;
 565
 566                         // If the valuenode.has no ID, then it must be defined in-place
 567                         if(value_node->get_id().empty())
 568                         {
 569                                 encode_value_node(node->add_child("value_node"),value_node,layer->get_canvas().constant());
 570                         }
 571                         else
 572                         {
 573                                 node->set_attribute("use",value_node->get_relative_id(layer->get_canvas()));
 574                         }
 575                 }
 576                 else  // Handle normal parameters
 577                 if(iter->get_critical())
 578                 {
 579                         ValueBase value=layer->get_param(iter->get_name());
 580                         if(!value.is_valid())
 581                         {
 582                                 error("Layer doesn't know its own vocabulary -- "+iter->get_name());
 583                                 continue;
 584                         }
 585
 586                         if(value.get_type()==ValueBase::TYPE_CANVAS && !value.get(Canvas::LooseHandle())->is_inline())
 587                         {
 588                                 Canvas::Handle child(value.get(Canvas::LooseHandle()));
 589
 590                                 if(!value.get(Canvas::Handle()))
 591                                         continue;
 592                                 xmlpp::Element *node=root->add_child("param");
 593                                 node->set_attribute("name",iter->get_name());
 594                                 node->set_attribute("use",child->get_relative_id(layer->get_canvas()));
 595                                 continue;
 596                         }
 597                         xmlpp::Element *node=root->add_child("param");
 598                         node->set_attribute("name",iter->get_name());
 599
 600                         encode_value(node->add_child("value"),value,layer->get_canvas().constant());
 601                 }
 602         }
 603
 604
 605         return root;
 606 }
 607
 608 xmlpp::Element* encode_canvas(xmlpp::Element* root,Canvas::ConstHandle canvas)
 609 {
 610         assert(canvas);
 611         const RendDesc &rend_desc=canvas->rend_desc();
 612         root->set_name("canvas");
 613
 614         if(canvas->is_root())
 615                 root->set_attribute("version","0.1");
 616
 617         if(!canvas->get_id().empty() && !canvas->is_root() && !canvas->is_inline())
 618                 root->set_attribute("id",canvas->get_id());
 619
 620         if(!canvas->parent() || canvas->parent()->rend_desc().get_w()!=canvas->rend_desc().get_w())
 621                 root->set_attribute("width",strprintf("%d",rend_desc.get_w()));
 622
 623         if(!canvas->parent() || canvas->parent()->rend_desc().get_h()!=canvas->rend_desc().get_h())
 624                 root->set_attribute("height",strprintf("%d",rend_desc.get_h()));
 625
 626         if(!canvas->parent() || canvas->parent()->rend_desc().get_x_res()!=canvas->rend_desc().get_x_res())
 627                 root->set_attribute("xres",strprintf("%f",rend_desc.get_x_res()));
 628
 629         if(!canvas->parent() || canvas->parent()->rend_desc().get_y_res()!=canvas->rend_desc().get_y_res())
 630                 root->set_attribute("yres",strprintf("%f",rend_desc.get_y_res()));
 631
 632
 633         if(!canvas->parent() ||
 634                 canvas->parent()->rend_desc().get_tl()!=canvas->rend_desc().get_tl() ||
 635                 canvas->parent()->rend_desc().get_br()!=canvas->rend_desc().get_br())
 636         root->set_attribute("view-box",strprintf(VIEW_BOX_FORMAT,
 637                 rend_desc.get_tl()[0],
 638                 rend_desc.get_tl()[1],
 639                 rend_desc.get_br()[0],
 640                 rend_desc.get_br()[1])
 641         );
 642
 643         if(!canvas->parent() || canvas->parent()->rend_desc().get_antialias()!=canvas->rend_desc().get_antialias())
 644                 root->set_attribute("antialias",strprintf("%d",rend_desc.get_antialias()));
 645
 646         if(!canvas->parent())
 647                 root->set_attribute("fps",strprintf(TIME_TYPE_FORMAT,rend_desc.get_frame_rate()));
 648
 649         if(!canvas->parent() || canvas->parent()->rend_desc().get_time_start()!=canvas->rend_desc().get_time_start())
 650                 root->set_attribute("begin-time",rend_desc.get_time_start().get_string(rend_desc.get_frame_rate()));
 651
 652         if(!canvas->parent() || canvas->parent()->rend_desc().get_time_end()!=canvas->rend_desc().get_time_end())
 653                 root->set_attribute("end-time",rend_desc.get_time_end().get_string(rend_desc.get_frame_rate()));
 654
 655         if(!canvas->is_inline())
 656         {
 657                 root->set_attribute("bgcolor",strprintf(VIEW_BOX_FORMAT,
 658                         rend_desc.get_bg_color().get_r(),
 659                         rend_desc.get_bg_color().get_g(),
 660                         rend_desc.get_bg_color().get_b(),
 661                         rend_desc.get_bg_color().get_a())
 662                 );
 663
 664                 if(!canvas->get_name().empty())
 665                         root->add_child("name")->set_child_text(canvas->get_name());
 666                 if(!canvas->get_description().empty())
 667                         root->add_child("desc")->set_child_text(canvas->get_description());
 668                 if(!canvas->get_author().empty())
 669                         root->add_child("author")->set_child_text(canvas->get_description());
 670
 671                 std::list<String> meta_keys(canvas->get_meta_data_keys());
 672                 while(!meta_keys.empty())
 673                 {
 674                         xmlpp::Element* meta_element(root->add_child("meta"));
 675                         meta_element->set_attribute("name",meta_keys.front());
 676                         meta_element->set_attribute("content",canvas->get_meta_data(meta_keys.front()));
 677                         meta_keys.pop_front();
 678                 }
 679                 for(KeyframeList::const_iterator iter=canvas->keyframe_list().begin();iter!=canvas->keyframe_list().end();++iter)
 680                         encode_keyframe(root->add_child("keyframe"),*iter,canvas->rend_desc().get_frame_rate());
 681         }
 682
 683         // Output the <defs> section
 684         if(!canvas->is_inline() && !canvas->value_node_list().empty() || !canvas->children().empty())
 685         {
 686                 xmlpp::Element *node=root->add_child("defs");
 687                 const ValueNodeList &value_node_list(canvas->value_node_list());
 688
 689                 for(ValueNodeList::const_iterator iter=value_node_list.begin();iter!=value_node_list.end();++iter)
 690                 {
 691                         // If the value_node is a constant, then use the shorthand
 692                         if(handle<ValueNode_Const>::cast_dynamic(*iter))
 693                         {
 694                                 ValueNode_Const::Handle value_node(ValueNode_Const::Handle::cast_dynamic(*iter));
 695                                 reinterpret_cast<xmlpp::Element*>(encode_value(node->add_child("value"),value_node->get_value()))->set_attribute("id",value_node->get_id());
 696                                 continue;
 697                         }
 698                         encode_value_node(node->add_child("value_node"),*iter,canvas);
 699                         // writeme
 700                 }
 701
 702                 for(Canvas::Children::const_iterator iter=canvas->children().begin();iter!=canvas->children().end();++iter)
 703                 {
 704                         encode_canvas(node->add_child("canvas"),*iter);
 705                 }
 706         }
 707
 708         Canvas::const_reverse_iterator iter;
 709
 710         for(iter=canvas->rbegin();iter!=canvas->rend();++iter)
 711                 encode_layer(root->add_child("layer"),*iter);
 712
 713         return root;
 714 }
 715
 716 bool
 717 synfig::save_canvas(const String &filename, Canvas::ConstHandle canvas)
 718 {
 719     ChangeLocale change_locale(LC_NUMERIC, "C");
 720
 721         synfig::String tmp_filename(filename+".TMP");
 722
 723         try
 724         {
 725                 assert(canvas);
 726                 xmlpp::Document document;
 727
 728                 encode_canvas(document.create_root_node("canvas"),canvas);
 729
 730                 document.write_to_file_formatted(tmp_filename);
 731         }
 732         catch(...) { synfig::error("synfig::save_canvas(): Caught unknown exception"); return false; }
 733
 734
 735 #ifdef _WIN32
 736         // On Win32 platforms, rename() has bad behavior. work around it.
 737         char old_file[80]="sif.XXXXXXXX";
 738         mktemp(old_file);
 739         rename(filename.c_str(),old_file);
 740         if(rename(tmp_filename.c_str(),filename.c_str())!=0)
 741         {
 742                 rename(old_file,tmp_filename.c_str());
 743                 synfig::error("synfig::save_canvas(): Unable to rename file to correct filename, errno=%d",errno);
 744                 return false;
 745         }
 746         remove(old_file);
 747 #else
 748         if(rename(tmp_filename.c_str(),filename.c_str())!=0)
 749         {
 750                 synfig::error("synfig::save_canvas(): Unable to rename file to correct filename, errno=%d",errno);
 751                 return false;
 752         }
 753 #endif
 754
 755         return true;
 756 }
 757
 758 String
 759 synfig::canvas_to_string(Canvas::ConstHandle canvas)
 760 {
 761     ChangeLocale change_locale(LC_NUMERIC, "C");
 762         assert(canvas);
 763
 764         xmlpp::Document document;
 765
 766         encode_canvas(document.create_root_node("canvas"),canvas);
 767
 768         return document.write_to_string_formatted();
 769 }