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 **      Copyright (c) 2007 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 #ifdef USING_PCH
  27 #       include "pch.h"
  28 #else
  29 #ifdef HAVE_CONFIG_H
  30 #       include <config.h>
  31 #endif
  32
  33 #ifdef HAVE_SYS_ERRNO_H
  34 #       include <sys/errno.h>
  35 #endif
  36
  37 #include "savecanvas.h"
  38 #include "general.h"
  39 #include "valuenode.h"
  40 #include "valuenode_subtract.h"
  41 #include "valuenode_animated.h"
  42 #include "valuenode_composite.h"
  43 #include "valuenode_const.h"
  44 #include "valuenode_linear.h"
  45 #include "valuenode_dynamiclist.h"
  46 #include "valuenode_reference.h"
  47 #include "valuenode_segcalctangent.h"
  48 #include "valuenode_segcalcvertex.h"
  49 #include "valuenode_bline.h"
  50 #include "time.h"
  51 #include "keyframe.h"
  52 #include "layer.h"
  53 #include "string.h"
  54 #include "paramdesc.h"
  55
  56 #include <libxml++/libxml++.h>
  57 #include <ETL/stringf>
  58 #include "gradient.h"
  59 #include <errno.h>
  60
  61 extern "C" {
  62 #include <libxml/tree.h>
  63 }
  64
  65 #endif
  66
  67 /* === U S I N G =========================================================== */
  68
  69 using namespace std;
  70 using namespace etl;
  71 using namespace synfig;
  72
  73 /* === M A C R O S ========================================================= */
  74
  75 #define COLOR_VALUE_TYPE_FORMAT         "%f"
  76 #define VECTOR_VALUE_TYPE_FORMAT        "%0.10f"
  77 #define TIME_TYPE_FORMAT                        "%0.3f"
  78 #define VIEW_BOX_FORMAT                         "%f %f %f %f"
  79
  80 /* === G L O B A L S ======================================================= */
  81
  82 FileVersion save_canvas_version;
  83
  84 /* === P R O C E D U R E S ================================================= */
  85
  86 xmlpp::Element* encode_canvas(xmlpp::Element* root,Canvas::ConstHandle canvas);
  87 xmlpp::Element* encode_value_node(xmlpp::Element* root,ValueNode::ConstHandle value_node,Canvas::ConstHandle canvas);
  88
  89 xmlpp::Element* encode_keyframe(xmlpp::Element* root,const Keyframe &kf, float fps)
  90 {
  91         root->set_name("keyframe");
  92         root->set_attribute("time",kf.get_time().get_string(fps));
  93         if(!kf.get_description().empty())
  94                 root->set_child_text(kf.get_description());
  95         return root;
  96 }
  97
  98
  99 xmlpp::Element* encode_real(xmlpp::Element* root,Real v)
 100 {
 101         root->set_name("real");
 102         root->set_attribute("value",strprintf(VECTOR_VALUE_TYPE_FORMAT,v));
 103         return root;
 104 }
 105
 106 xmlpp::Element* encode_time(xmlpp::Element* root,Time t, float /*fps*/=0)
 107 {
 108         root->set_name("time");
 109         //root->set_attribute("value",t.get_string(fps));
 110         root->set_attribute("value",t.get_string());
 111         return root;
 112 }
 113
 114 xmlpp::Element* encode_integer(xmlpp::Element* root,int i)
 115 {
 116         root->set_name("integer");
 117         root->set_attribute("value",strprintf("%i",i));
 118         return root;
 119 }
 120
 121 xmlpp::Element* encode_bool(xmlpp::Element* root,bool b)
 122 {
 123         root->set_name("bool");
 124         root->set_attribute("value",b?"true":"false");
 125         return root;
 126 }
 127
 128 xmlpp::Element* encode_string(xmlpp::Element* root,const String &str)
 129 {
 130         root->set_name("string");
 131         root->set_child_text(str);
 132         return root;
 133 }
 134
 135 xmlpp::Element* encode_vector(xmlpp::Element* root,Vector vect)
 136 {
 137         root->set_name("vector");
 138         root->add_child("x")->set_child_text(strprintf(VECTOR_VALUE_TYPE_FORMAT,(float)vect[0]));
 139         root->add_child("y")->set_child_text(strprintf(VECTOR_VALUE_TYPE_FORMAT,(float)vect[1]));
 140         return root;
 141 }
 142
 143 xmlpp::Element* encode_color(xmlpp::Element* root,Color color)
 144 {
 145         root->set_name("color");
 146         root->add_child("r")->set_child_text(strprintf(COLOR_VALUE_TYPE_FORMAT,(float)color.get_r()));
 147         root->add_child("g")->set_child_text(strprintf(COLOR_VALUE_TYPE_FORMAT,(float)color.get_g()));
 148         root->add_child("b")->set_child_text(strprintf(COLOR_VALUE_TYPE_FORMAT,(float)color.get_b()));
 149         root->add_child("a")->set_child_text(strprintf(COLOR_VALUE_TYPE_FORMAT,(float)color.get_a()));
 150         return root;
 151 }
 152
 153 xmlpp::Element* encode_angle(xmlpp::Element* root,Angle theta)
 154 {
 155         root->set_name("angle");
 156         root->set_attribute("value",strprintf("%f",(float)Angle::deg(theta).get()));
 157         return root;
 158 }
 159
 160 xmlpp::Element* encode_segment(xmlpp::Element* root,Segment seg)
 161 {
 162         root->set_name("segment");
 163         encode_vector(root->add_child("p1")->add_child("vector"),seg.p1);
 164         encode_vector(root->add_child("t1")->add_child("vector"),seg.t1);
 165         encode_vector(root->add_child("p2")->add_child("vector"),seg.p2);
 166         encode_vector(root->add_child("t2")->add_child("vector"),seg.t2);
 167         return root;
 168 }
 169
 170 xmlpp::Element* encode_bline_point(xmlpp::Element* root,BLinePoint bline_point)
 171 {
 172         root->set_name(ValueBase::type_name(ValueBase::TYPE_BLINEPOINT));
 173
 174         encode_vector(root->add_child("vertex")->add_child("vector"),bline_point.get_vertex());
 175         encode_vector(root->add_child("t1")->add_child("vector"),bline_point.get_tangent1());
 176
 177         if(bline_point.get_split_tangent_flag())
 178                 encode_vector(root->add_child("t2")->add_child("vector"),bline_point.get_tangent2());
 179
 180         encode_real(root->add_child("width")->add_child("real"),bline_point.get_width());
 181         encode_real(root->add_child("origin")->add_child("real"),bline_point.get_origin());
 182         return root;
 183 }
 184
 185 xmlpp::Element* encode_gradient(xmlpp::Element* root,Gradient x)
 186 {
 187         root->set_name("gradient");
 188
 189         Gradient::const_iterator iter;
 190         x.sort();
 191         for(iter=x.begin();iter!=x.end();iter++)
 192         {
 193                 xmlpp::Element *cpoint(encode_color(root->add_child("color"),iter->color));
 194                 cpoint->set_attribute("pos",strprintf("%f",iter->pos));
 195         }
 196         return root;
 197 }
 198
 199
 200 xmlpp::Element* encode_value(xmlpp::Element* root,const ValueBase &data,Canvas::ConstHandle canvas=0);
 201
 202 xmlpp::Element* encode_list(xmlpp::Element* root,std::list<ValueBase> list, Canvas::ConstHandle canvas=0)
 203 {
 204         root->set_name("list");
 205
 206         while(!list.empty())
 207         {
 208                 encode_value(root->add_child("value"),list.front(),canvas);
 209                 list.pop_front();
 210         }
 211
 212         return root;
 213 }
 214
 215 xmlpp::Element* encode_value(xmlpp::Element* root,const ValueBase &data,Canvas::ConstHandle canvas)
 216 {
 217         switch(data.get_type())
 218         {
 219         case ValueBase::TYPE_REAL:
 220                 return encode_real(root,data.get(Real()));
 221         case ValueBase::TYPE_TIME:
 222                 if(canvas)
 223                         return encode_time(root,data.get(Time()),canvas->rend_desc().get_frame_rate());
 224                 else
 225                         return encode_time(root,data.get(Time()));
 226         case ValueBase::TYPE_INTEGER:
 227                 return encode_integer(root,data.get(int()));
 228         case ValueBase::TYPE_COLOR:
 229                 return encode_color(root,data.get(Color()));
 230         case ValueBase::TYPE_VECTOR:
 231                 return encode_vector(root,data.get(Vector()));
 232         case ValueBase::TYPE_ANGLE:
 233                 return encode_angle(root,data.get(Angle()));
 234         case ValueBase::TYPE_BOOL:
 235                 return encode_bool(root,data.get(bool()));
 236         case ValueBase::TYPE_STRING:
 237                 return encode_string(root,data.get(String()));
 238         case ValueBase::TYPE_SEGMENT:
 239                 return encode_segment(root,data.get(Segment()));
 240         case ValueBase::TYPE_BLINEPOINT:
 241                 return encode_bline_point(root,data.get(BLinePoint()));
 242         case ValueBase::TYPE_GRADIENT:
 243                 return encode_gradient(root,data.get(Gradient()));
 244         case ValueBase::TYPE_LIST:
 245                 return encode_list(root,data,canvas);
 246         case ValueBase::TYPE_CANVAS:
 247                 return encode_canvas(root,data.get(Canvas::Handle()).get());
 248         case ValueBase::TYPE_NIL:
 249                 synfig::error("Encountered NIL ValueBase");
 250                 root->set_name("nil");
 251                 return root;
 252         default:
 253                 synfig::error(strprintf(_("Unknown value(%s), cannot create XML representation!"),ValueBase::type_local_name(data.get_type()).c_str()));
 254                 root->set_name("nil");
 255                 return root;
 256         }
 257 }
 258
 259 xmlpp::Element* encode_animated(xmlpp::Element* root,ValueNode_Animated::ConstHandle value_node,Canvas::ConstHandle canvas=0)
 260 {
 261         assert(value_node);
 262         root->set_name("animated");
 263
 264         root->set_attribute("type",ValueBase::type_name(value_node->get_type()));
 265
 266         const ValueNode_Animated::WaypointList &waypoint_list=value_node->waypoint_list();
 267         ValueNode_Animated::WaypointList::const_iterator iter;
 268
 269         for(iter=waypoint_list.begin();iter!=waypoint_list.end();++iter)
 270         {
 271                 xmlpp::Element *waypoint_node=root->add_child("waypoint");
 272                 //waypoint_node->set_attribute("time",iter->get_time().get_string(canvas->rend_desc().get_frame_rate()));
 273                 waypoint_node->set_attribute("time",iter->get_time().get_string());
 274
 275                 //waypoint_node->add_child(encode_value(iter->get_value(),canvas));
 276                 if(iter->get_value_node()->is_exported())
 277                         waypoint_node->set_attribute("use",iter->get_value_node()->get_relative_id(canvas));
 278                 else {
 279                         ValueNode::ConstHandle value_node = iter->get_value_node();
 280                         if(ValueNode_Const::ConstHandle::cast_dynamic(value_node)) {
 281                                 const ValueBase data = ValueNode_Const::ConstHandle::cast_dynamic(value_node)->get_value();
 282                                 if (data.get_type() == ValueBase::TYPE_CANVAS)
 283                                         waypoint_node->set_attribute("use",data.get(Canvas::Handle()).get()->get_relative_id(canvas));
 284                                 else
 285                                         encode_value_node(waypoint_node->add_child("value_node"),iter->get_value_node(),canvas);
 286                         }
 287                         else
 288                                 encode_value_node(waypoint_node->add_child("value_node"),iter->get_value_node(),canvas);
 289                 }
 290
 291                 switch(iter->get_before())
 292                 {
 293                 case INTERPOLATION_HALT:
 294                         waypoint_node->set_attribute("before","halt");
 295                         break;
 296                 case INTERPOLATION_LINEAR:
 297                         waypoint_node->set_attribute("before","linear");
 298                         break;
 299                 case INTERPOLATION_MANUAL:
 300                         waypoint_node->set_attribute("before","manual");
 301                         break;
 302                 case INTERPOLATION_CONSTANT:
 303                         waypoint_node->set_attribute("before","constant");
 304                         break;
 305                 case INTERPOLATION_TCB:
 306                         waypoint_node->set_attribute("before","auto");
 307                         break;
 308                 default:
 309                         error("Unknown waypoint type for \"before\" attribute");
 310                 }
 311
 312                 switch(iter->get_after())
 313                 {
 314                 case INTERPOLATION_HALT:
 315                         waypoint_node->set_attribute("after","halt");
 316                         break;
 317                 case INTERPOLATION_LINEAR:
 318                         waypoint_node->set_attribute("after","linear");
 319                         break;
 320                 case INTERPOLATION_MANUAL:
 321                         waypoint_node->set_attribute("after","manual");
 322                         break;
 323                 case INTERPOLATION_CONSTANT:
 324                         waypoint_node->set_attribute("after","constant");
 325                         break;
 326                 case INTERPOLATION_TCB:
 327                         waypoint_node->set_attribute("after","auto");
 328                         break;
 329                 default:
 330                         error("Unknown waypoint type for \"after\" attribute");
 331                 }
 332
 333                 if(iter->get_tension()!=0.0)
 334                         waypoint_node->set_attribute("tension",strprintf("%f",iter->get_tension()));
 335                 if(iter->get_time_tension()!=0.0)
 336                         waypoint_node->set_attribute("temporal-tension",strprintf("%f",iter->get_time_tension()));
 337                 if(iter->get_continuity()!=0.0)
 338                         waypoint_node->set_attribute("continuity",strprintf("%f",iter->get_continuity()));
 339                 if(iter->get_bias()!=0.0)
 340                         waypoint_node->set_attribute("bias",strprintf("%f",iter->get_bias()));
 341
 342         }
 343
 344         return root;
 345 }
 346
 347 xmlpp::Element* encode_subtract(xmlpp::Element* root,ValueNode_Subtract::ConstHandle value_node,Canvas::ConstHandle canvas=0)
 348 {
 349         assert(value_node);
 350         root->set_name("subtract");
 351
 352         ValueNode::ConstHandle lhs=value_node->get_lhs();
 353         ValueNode::ConstHandle rhs=value_node->get_rhs();
 354         ValueNode::ConstHandle scalar=value_node->get_scalar();
 355
 356         assert(lhs);
 357         assert(rhs);
 358
 359         root->set_attribute("type",ValueBase::type_name(value_node->get_type()));
 360
 361         if(lhs==rhs)
 362                 warning("LHS is equal to RHS, this <subtract> will always be zero!");
 363
 364         //if(value_node->get_scalar()!=1)
 365         //      root->set_attribute("scalar",strprintf(VECTOR_VALUE_TYPE_FORMAT,value_node->get_scalar()));
 366
 367         if(!scalar->get_id().empty())
 368                 root->set_attribute("scalar",scalar->get_relative_id(canvas));
 369         else
 370                 encode_value_node(root->add_child("scalar")->add_child("value_node"),scalar,canvas);
 371
 372         if(!lhs->get_id().empty())
 373                 root->set_attribute("lhs",lhs->get_relative_id(canvas));
 374         else
 375                 encode_value_node(root->add_child("lhs")->add_child("value_node"),lhs,canvas);
 376
 377         if(!rhs->get_id().empty())
 378                 root->set_attribute("rhs",rhs->get_relative_id(canvas));
 379         else
 380                 encode_value_node(root->add_child("rhs")->add_child("value_node"),rhs,canvas);
 381
 382         return root;
 383 }
 384
 385 xmlpp::Element* encode_dynamic_list(xmlpp::Element* root,ValueNode_DynamicList::ConstHandle value_node,Canvas::ConstHandle canvas=0)
 386 {
 387         assert(value_node);
 388         const float fps(canvas?canvas->rend_desc().get_frame_rate():0);
 389
 390         root->set_name(value_node->get_name());
 391
 392         root->set_attribute("type",ValueBase::type_name(value_node->get_contained_type()));
 393
 394         vector<ValueNode_DynamicList::ListEntry>::const_iterator iter;
 395
 396         ValueNode_BLine::ConstHandle bline_value_node(ValueNode_BLine::ConstHandle::cast_dynamic(value_node));
 397
 398         if(bline_value_node)
 399         {
 400                 if(bline_value_node->get_loop())
 401                         root->set_attribute("loop","true");
 402                 else
 403                         root->set_attribute("loop","false");
 404         }
 405
 406         for(iter=value_node->list.begin();iter!=value_node->list.end();++iter)
 407         {
 408                 xmlpp::Element  *entry_node=root->add_child("entry");
 409                 assert(iter->value_node);
 410                 if(!iter->value_node->get_id().empty())
 411                         entry_node->set_attribute("use",iter->value_node->get_relative_id(canvas));
 412                 else
 413                         encode_value_node(entry_node->add_child("value_node"),iter->value_node,canvas);
 414
 415                 // process waypoints
 416                 {
 417                         typedef synfig::ValueNode_DynamicList::ListEntry::Activepoint Activepoint;
 418                         typedef synfig::ValueNode_DynamicList::ListEntry::ActivepointList ActivepointList;
 419                         String begin_sequence;
 420                         String end_sequence;
 421
 422                         const ActivepointList& timing_info(iter->timing_info);
 423                         ActivepointList::const_iterator entry_iter;
 424
 425                         for(entry_iter=timing_info.begin();entry_iter!=timing_info.end();++entry_iter)
 426                                 if(entry_iter->state==true)
 427                                 {
 428                                         if(entry_iter->priority)
 429                                         {
 430                                                 printf("begin priority is %d\n", entry_iter->priority);
 431                                                 begin_sequence+=strprintf("p%d ",entry_iter->priority);
 432                                         }
 433                                         begin_sequence+=entry_iter->time.get_string(fps)+", ";
 434                                 }
 435                                 else
 436                                 {
 437                                         if(entry_iter->priority)
 438                                         {
 439                                                 printf("end priority is %d\n", entry_iter->priority);
 440                                                 end_sequence+=strprintf("p%d ",entry_iter->priority);
 441                                         }
 442                                         end_sequence+=entry_iter->time.get_string(fps)+", ";
 443                                 }
 444
 445                         // If this is just a plane-jane vanilla entry,
 446                         // then don't bother with begins and ends
 447                         if(end_sequence.empty() && begin_sequence=="SOT, ")
 448                                 begin_sequence.clear();
 449
 450                         if(!begin_sequence.empty())
 451                         {
 452                                 // Remove the last ", " stuff
 453                                 begin_sequence=String(begin_sequence.begin(),begin_sequence.end()-2);
 454                                 // Add the attribute
 455                                 entry_node->set_attribute("on",begin_sequence);
 456                         }
 457
 458                         if(!end_sequence.empty())
 459                         {
 460                                 // Remove the last ", " stuff
 461                                 end_sequence=String(end_sequence.begin(),end_sequence.end()-2);
 462                                 // Add the attribute
 463                                 entry_node->set_attribute("off",end_sequence);
 464                         }
 465                 }
 466         }
 467
 468         return root;
 469 }
 470
 471 // Generic linkable data node entry
 472 xmlpp::Element* encode_linkable_value_node(xmlpp::Element* root,LinkableValueNode::ConstHandle value_node,Canvas::ConstHandle canvas=0)
 473 {
 474         assert(value_node);
 475         root->set_name(value_node->get_name());
 476
 477         root->set_attribute("type",ValueBase::type_name(value_node->get_type()));
 478
 479         int i;
 480         for(i=0;i<value_node->link_count();i++)
 481         {
 482                 ValueNode::ConstHandle link=value_node->get_link(i).constant();
 483                 if(!link)
 484                         throw runtime_error("Bad link");
 485                 if(link->is_exported())
 486                         root->set_attribute(value_node->link_name(i),link->get_relative_id(canvas));
 487                 else
 488                         encode_value_node(root->add_child(value_node->link_name(i))->add_child("value_node"),link,canvas);
 489         }
 490
 491         return root;
 492 }
 493
 494 xmlpp::Element* encode_value_node(xmlpp::Element* root,ValueNode::ConstHandle value_node,Canvas::ConstHandle canvas)
 495 {
 496         assert(value_node);
 497
 498         if(ValueNode_Animated::ConstHandle::cast_dynamic(value_node))
 499                 encode_animated(root,ValueNode_Animated::ConstHandle::cast_dynamic(value_node),canvas);
 500         else
 501         if(ValueNode_Subtract::ConstHandle::cast_dynamic(value_node))
 502                 encode_subtract(root,ValueNode_Subtract::ConstHandle::cast_dynamic(value_node),canvas);
 503         else
 504         if(ValueNode_DynamicList::ConstHandle::cast_dynamic(value_node))
 505                 encode_dynamic_list(root,ValueNode_DynamicList::ConstHandle::cast_dynamic(value_node),canvas);
 506         else if(ValueNode_Const::ConstHandle::cast_dynamic(value_node))
 507         {
 508                 encode_value(root,ValueNode_Const::ConstHandle::cast_dynamic(value_node)->get_value(),canvas);
 509         }
 510         else
 511         if(LinkableValueNode::ConstHandle::cast_dynamic(value_node))
 512                 encode_linkable_value_node(root,LinkableValueNode::ConstHandle::cast_dynamic(value_node),canvas);
 513         else
 514         {
 515                 error(_("Unknown ValueNode Type (%s), cannot create an XML representation"),value_node->get_local_name().c_str());
 516                 root->set_name("nil");
 517         }
 518
 519         assert(root);
 520
 521         if(!value_node->get_id().empty())
 522                 root->set_attribute("id",value_node->get_id());
 523
 524         if(value_node->rcount()>1)
 525                 root->set_attribute("guid",(value_node->get_guid()^canvas->get_root()->get_guid()).get_string());
 526
 527         return root;
 528 }
 529
 530 xmlpp::Element* encode_layer(xmlpp::Element* root,Layer::ConstHandle layer)
 531 {
 532         root->set_name("layer");
 533
 534         root->set_attribute("type",layer->get_name());
 535         root->set_attribute("active",layer->active()?"true":"false");
 536
 537         if(!layer->get_version().empty())
 538                 root->set_attribute("version",layer->get_version());
 539         if(!layer->get_description().empty())
 540                 root->set_attribute("desc",layer->get_description());
 541         if(!layer->get_group().empty())
 542                 root->set_attribute("group",layer->get_group());
 543
 544         Layer::Vocab vocab(layer->get_param_vocab());
 545         Layer::Vocab::const_iterator iter;
 546
 547         const Layer::DynamicParamList &dynamic_param_list=layer->dynamic_param_list();
 548
 549         for(iter=vocab.begin();iter!=vocab.end();++iter)
 550         {
 551                 // Handle dynamic parameters
 552                 if(dynamic_param_list.count(iter->get_name()))
 553                 {
 554                         xmlpp::Element *node=root->add_child("param");
 555                         node->set_attribute("name",iter->get_name());
 556
 557                         handle<const ValueNode> value_node=dynamic_param_list.find(iter->get_name())->second;
 558
 559                         // If the valuenode has no ID, then it must be defined in-place
 560                         if(value_node->get_id().empty())
 561                         {
 562                                 encode_value_node(node->add_child("value_node"),value_node,layer->get_canvas().constant());
 563                         }
 564                         else
 565                         {
 566                                 node->set_attribute("use",value_node->get_relative_id(layer->get_canvas()));
 567                         }
 568                 }
 569                 else  // Handle normal parameters
 570                 if(iter->get_critical())
 571                 {
 572                         ValueBase value=layer->get_param(iter->get_name());
 573                         if(!value.is_valid())
 574                         {
 575                                 error("Layer doesn't know its own vocabulary -- "+iter->get_name());
 576                                 continue;
 577                         }
 578
 579                         if(value.get_type()==ValueBase::TYPE_CANVAS)
 580                         {
 581                                 // the ->is_inline() below was crashing if the canvas
 582                                 // contained a PasteCanvas with the default <No Image
 583                                 // Selected> Canvas setting;  this avoids the crash
 584                                 if (!value.get(Canvas::LooseHandle()))
 585                                         continue;
 586
 587                                 if (!value.get(Canvas::LooseHandle())->is_inline())
 588                                 {
 589                                         Canvas::Handle child(value.get(Canvas::LooseHandle()));
 590
 591                                         if(!value.get(Canvas::Handle()))
 592                                                 continue;
 593                                         xmlpp::Element *node=root->add_child("param");
 594                                         node->set_attribute("name",iter->get_name());
 595                                         node->set_attribute("use",child->get_relative_id(layer->get_canvas()));
 596                                         continue;
 597                                 }
 598                         }
 599                         xmlpp::Element *node=root->add_child("param");
 600                         node->set_attribute("name",iter->get_name());
 601
 602                         encode_value(node->add_child("value"),value,layer->get_canvas().constant());
 603                 }
 604         }
 605
 606
 607         return root;
 608 }
 609
 610 xmlpp::Element* encode_canvas(xmlpp::Element* root,Canvas::ConstHandle canvas)
 611 {
 612         assert(canvas);
 613         const RendDesc &rend_desc=canvas->rend_desc();
 614         root->set_name("canvas");
 615
 616         if(canvas->is_root())
 617                 root->set_attribute("version",canvas->get_version());
 618
 619         if(!canvas->get_id().empty() && !canvas->is_root() && !canvas->is_inline())
 620                 root->set_attribute("id",canvas->get_id());
 621
 622         if(!canvas->parent() || canvas->parent()->rend_desc().get_w()!=canvas->rend_desc().get_w())
 623                 root->set_attribute("width",strprintf("%d",rend_desc.get_w()));
 624
 625         if(!canvas->parent() || canvas->parent()->rend_desc().get_h()!=canvas->rend_desc().get_h())
 626                 root->set_attribute("height",strprintf("%d",rend_desc.get_h()));
 627
 628         if(!canvas->parent() || canvas->parent()->rend_desc().get_x_res()!=canvas->rend_desc().get_x_res())
 629                 root->set_attribute("xres",strprintf("%f",rend_desc.get_x_res()));
 630
 631         if(!canvas->parent() || canvas->parent()->rend_desc().get_y_res()!=canvas->rend_desc().get_y_res())
 632                 root->set_attribute("yres",strprintf("%f",rend_desc.get_y_res()));
 633
 634
 635         if(!canvas->parent() ||
 636                 canvas->parent()->rend_desc().get_tl()!=canvas->rend_desc().get_tl() ||
 637                 canvas->parent()->rend_desc().get_br()!=canvas->rend_desc().get_br())
 638         root->set_attribute("view-box",strprintf(VIEW_BOX_FORMAT,
 639                 rend_desc.get_tl()[0],
 640                 rend_desc.get_tl()[1],
 641                 rend_desc.get_br()[0],
 642                 rend_desc.get_br()[1])
 643         );
 644
 645         if(!canvas->parent() || canvas->parent()->rend_desc().get_antialias()!=canvas->rend_desc().get_antialias())
 646                 root->set_attribute("antialias",strprintf("%d",rend_desc.get_antialias()));
 647
 648         if(!canvas->parent())
 649                 root->set_attribute("fps",strprintf(TIME_TYPE_FORMAT,rend_desc.get_frame_rate()));
 650
 651         if(!canvas->parent() || canvas->parent()->rend_desc().get_time_start()!=canvas->rend_desc().get_time_start())
 652                 root->set_attribute("begin-time",rend_desc.get_time_start().get_string(rend_desc.get_frame_rate()));
 653
 654         if(!canvas->parent() || canvas->parent()->rend_desc().get_time_end()!=canvas->rend_desc().get_time_end())
 655                 root->set_attribute("end-time",rend_desc.get_time_end().get_string(rend_desc.get_frame_rate()));
 656
 657         if(!canvas->is_inline())
 658         {
 659                 root->set_attribute("bgcolor",strprintf(VIEW_BOX_FORMAT,
 660                         rend_desc.get_bg_color().get_r(),
 661                         rend_desc.get_bg_color().get_g(),
 662                         rend_desc.get_bg_color().get_b(),
 663                         rend_desc.get_bg_color().get_a())
 664                 );
 665
 666                 if(!canvas->get_name().empty())
 667                         root->add_child("name")->set_child_text(canvas->get_name());
 668                 if(!canvas->get_description().empty())
 669                         root->add_child("desc")->set_child_text(canvas->get_description());
 670                 if(!canvas->get_author().empty())
 671                         root->add_child("author")->set_child_text(canvas->get_description());
 672
 673                 std::list<String> meta_keys(canvas->get_meta_data_keys());
 674                 while(!meta_keys.empty())
 675                 {
 676                         xmlpp::Element* meta_element(root->add_child("meta"));
 677                         meta_element->set_attribute("name",meta_keys.front());
 678                         meta_element->set_attribute("content",canvas->get_meta_data(meta_keys.front()));
 679                         meta_keys.pop_front();
 680                 }
 681                 for(KeyframeList::const_iterator iter=canvas->keyframe_list().begin();iter!=canvas->keyframe_list().end();++iter)
 682                         encode_keyframe(root->add_child("keyframe"),*iter,canvas->rend_desc().get_frame_rate());
 683         }
 684
 685         // Output the <defs> section
 686         //! \todo check where the parentheses should really go - around the && or the ||?
 687         if((!canvas->is_inline() && !canvas->value_node_list().empty()) || !canvas->children().empty())
 688         {
 689                 xmlpp::Element *node=root->add_child("defs");
 690                 const ValueNodeList &value_node_list(canvas->value_node_list());
 691
 692                 for(ValueNodeList::const_iterator iter=value_node_list.begin();iter!=value_node_list.end();++iter)
 693                 {
 694                         // If the value_node is a constant, then use the shorthand
 695                         if(handle<ValueNode_Const>::cast_dynamic(*iter))
 696                         {
 697                                 ValueNode_Const::Handle value_node(ValueNode_Const::Handle::cast_dynamic(*iter));
 698                                 reinterpret_cast<xmlpp::Element*>(encode_value(node->add_child("value"),value_node->get_value()))->set_attribute("id",value_node->get_id());
 699                                 continue;
 700                         }
 701                         encode_value_node(node->add_child("value_node"),*iter,canvas);
 702                         // writeme
 703                 }
 704
 705                 for(Canvas::Children::const_iterator iter=canvas->children().begin();iter!=canvas->children().end();++iter)
 706                 {
 707                         encode_canvas(node->add_child("canvas"),*iter);
 708                 }
 709         }
 710
 711         Canvas::const_reverse_iterator iter;
 712
 713         for(iter=canvas->rbegin();iter!=canvas->rend();++iter)
 714                 encode_layer(root->add_child("layer"),*iter);
 715
 716         return root;
 717 }
 718
 719 bool
 720 synfig::save_canvas(const String &filename, Canvas::ConstHandle canvas)
 721 {
 722     ChangeLocale change_locale(LC_NUMERIC, "C");
 723
 724         synfig::String tmp_filename(filename+".TMP");
 725
 726         if (filename_extension(filename) == ".sifz")
 727                 xmlSetCompressMode(9);
 728         else
 729                 xmlSetCompressMode(0);
 730
 731         try
 732         {
 733                 assert(canvas);
 734                 xmlpp::Document document;
 735
 736                 encode_canvas(document.create_root_node("canvas"),canvas);
 737
 738                 document.write_to_file_formatted(tmp_filename);
 739         }
 740         catch(...) { synfig::error("synfig::save_canvas(): Caught unknown exception"); return false; }
 741
 742
 743 #ifdef _WIN32
 744         // On Win32 platforms, rename() has bad behavior. work around it.
 745         char old_file[80]="sif.XXXXXXXX";
 746         mktemp(old_file);
 747         rename(filename.c_str(),old_file);
 748         if(rename(tmp_filename.c_str(),filename.c_str())!=0)
 749         {
 750                 rename(old_file,tmp_filename.c_str());
 751                 synfig::error("synfig::save_canvas(): Unable to rename file to correct filename, errno=%d",errno);
 752                 return false;
 753         }
 754         remove(old_file);
 755 #else
 756         if(rename(tmp_filename.c_str(),filename.c_str())!=0)
 757         {
 758                 synfig::error("synfig::save_canvas(): Unable to rename file to correct filename, errno=%d",errno);
 759                 return false;
 760         }
 761 #endif
 762
 763         return true;
 764 }
 765
 766 String
 767 synfig::canvas_to_string(Canvas::ConstHandle canvas)
 768 {
 769     ChangeLocale change_locale(LC_NUMERIC, "C");
 770         assert(canvas);
 771
 772         xmlpp::Document document;
 773
 774         encode_canvas(document.create_root_node("canvas"),canvas);
 775
 776         return document.write_to_string_formatted();
 777 }
 778
 779 void
 780 synfig::set_file_version(FileVersion version)
 781 {
 782         save_canvas_version = version;
 783 }
 784
 785 FileVersion
 786 synfig::get_file_version()
 787 {
 788         return save_canvas_version;
 789 }