src/document.cpp

   1 #include "document.h"
   2 #include "bezier.h"
   3 #include <cstdio>
   4 #include <fstream>
   5
   6 #include "../contrib/pugixml-1.4/src/pugixml.cpp"
   7
   8 #include "stb_truetype.h"
   9
  10 using namespace IPDF;
  11 using namespace std;
  12
  13 //TODO: Make this work for variable sized Reals
  14
  15 // Loads an std::vector<T> of size num_elements from a file.
  16 template<typename T>
  17 static void LoadStructVector(FILE *src_file, size_t num_elems, std::vector<T>& dest)
  18 {
  19         size_t structsread = 0;
  20         dest.resize(num_elems);
  21         structsread = fread(dest.data(), sizeof(T), num_elems, src_file);
  22         if (structsread != num_elems)
  23                 Fatal("Only read %u structs (expected %u)!", structsread, num_elems);
  24 }
  25
  26 // Saves an std::vector<T> to a file. Size must be saves separately.
  27 template<typename T>
  28 static void SaveStructVector(FILE *dst_file, std::vector<T>& src)
  29 {
  30         size_t written = 0;
  31         written = fwrite(src.data(), sizeof(T), src.size(), dst_file);
  32         if (written != src.size())
  33                 Fatal("Only wrote %u structs (expected %u)!", written, src.size());
  34 }
  35
  36 static void WriteChunkHeader(FILE *dst_file, DocChunkTypes type, uint32_t size)
  37 {
  38         size_t written = 0;
  39         written = fwrite(&type, sizeof(type), 1, dst_file);
  40         if (written != 1)
  41                 Fatal("Could not write Chunk header! (ID)");
  42         written = fwrite(&size, sizeof(size), 1, dst_file);
  43         if (written != 1)
  44                 Fatal("Could not write Chunk header (size)!");
  45 }
  46
  47 static bool ReadChunkHeader(FILE *src_file, DocChunkTypes& type, uint32_t& size)
  48 {
  49         if (fread(&type, sizeof(DocChunkTypes), 1, src_file) != 1)
  50                 return false;
  51         if (fread(&size, sizeof(uint32_t), 1, src_file) != 1)
  52                 return false;
  53         return true;
  54 }
  55
  56 void Document::Save(const string & filename)
  57 {
  58         Debug("Saving document to file \"%s\"...", filename.c_str());
  59         FILE * file = fopen(filename.c_str(), "w");
  60         if (file == NULL)
  61                 Fatal("Couldn't open file \"%s\" - %s", filename.c_str(), strerror(errno));
  62
  63         size_t written;
  64         Debug("Number of objects (%u)...", ObjectCount());
  65         WriteChunkHeader(file, CT_NUMOBJS, sizeof(m_count));
  66         written = fwrite(&m_count, sizeof(m_count), 1, file);
  67         if (written != 1)
  68                 Fatal("Failed to write number of objects!");
  69
  70         Debug("Object types...");
  71         WriteChunkHeader(file, CT_OBJTYPES, m_objects.types.size() * sizeof(ObjectType));
  72         SaveStructVector<ObjectType>(file, m_objects.types);
  73
  74         Debug("Object bounds...");
  75         WriteChunkHeader(file, CT_OBJBOUNDS, m_objects.bounds.size() * sizeof(Rect));
  76         SaveStructVector<Rect>(file, m_objects.bounds);
  77
  78         Debug("Object data indices...");
  79         WriteChunkHeader(file, CT_OBJINDICES, m_objects.data_indices.size() * sizeof(unsigned));
  80         SaveStructVector<unsigned>(file, m_objects.data_indices);
  81
  82         Debug("Bezier data...");
  83         WriteChunkHeader(file, CT_OBJBEZIERS, m_objects.beziers.size() * sizeof(uint8_t));
  84         SaveStructVector<Bezier>(file, m_objects.beziers);
  85
  86         int err = fclose(file);
  87         if (err != 0)
  88                 Fatal("Failed to close file \"%s\" - %s", filename.c_str(), strerror(err));
  89
  90         Debug("Successfully saved %u objects to \"%s\"", ObjectCount(), filename.c_str());
  91 }
  92
  93 #ifndef QUADTREE_DISABLED
  94
  95 void Document::GenBaseQuadtree()
  96 {
  97         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QTC_UNKNOWN, 0, ObjectCount()});
  98         m_quadtree.root_id = 0;
  99         GenQuadChild(0, QTC_TOP_LEFT);
 100 }
 101
 102 int Document::ClipObjectToQuadChild(int object_id, QuadTreeNodeChildren type)
 103 {
 104         switch (m_objects.types[object_id])
 105         {
 106         case RECT_FILLED:
 107         case RECT_OUTLINE:
 108                 {
 109                 Rect obj_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 110                 if (obj_bounds.x < 0)
 111                 {
 112                         obj_bounds.w += obj_bounds.x;
 113                         obj_bounds.x = 0;
 114                 }
 115                 if (obj_bounds.y < 0)
 116                 {
 117                         obj_bounds.h += obj_bounds.y;
 118                         obj_bounds.y = 0;
 119                 }
 120                 if (obj_bounds.x + obj_bounds.w > 1)
 121                 {
 122                         obj_bounds.w += (1 - (obj_bounds.x + obj_bounds.w));
 123                 }
 124                 if (obj_bounds.y + obj_bounds.h > 1)
 125                 {
 126                         obj_bounds.h += (1 - (obj_bounds.y + obj_bounds.h));
 127                 }
 128                 m_objects.bounds.push_back(obj_bounds);
 129                 m_objects.types.push_back(m_objects.types[object_id]);
 130                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 131                 return 1;
 132                 }
 133         case BEZIER:
 134                 {
 135                 Rect child_node_bounds = TransformFromQuadChild({0,0,1,1}, type);
 136                 std::vector<Bezier> new_curves = m_objects.beziers[m_objects.data_indices[object_id]].ClipToRectangle(child_node_bounds);
 137                 Rect obj_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 138                 for (size_t i = 0; i < new_curves.size(); ++i)
 139                 {
 140                         unsigned index = AddBezierData(new_curves[i]);
 141                         m_objects.bounds.push_back(obj_bounds);
 142                         m_objects.types.push_back(BEZIER);
 143                         m_objects.data_indices.push_back(index);
 144                 }
 145                 return new_curves.size();
 146                 }
 147         default:
 148                 Debug("Adding %s -> %s", m_objects.bounds[object_id].Str().c_str(), TransformToQuadChild(m_objects.bounds[object_id], type).Str().c_str());
 149                 m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 150                 m_objects.types.push_back(m_objects.types[object_id]);
 151                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 152                 return 1;
 153         }
 154         return 0;
 155 }
 156 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 157 {
 158         QuadTreeIndex new_index = m_quadtree.nodes.size();
 159         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 160
 161         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 162         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 163         {
 164                 if (IntersectsQuadChild(m_objects.bounds[i], type))
 165                 {
 166                         m_count += ClipObjectToQuadChild(i, type);
 167                 }
 168         }
 169         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 170         switch (type)
 171         {
 172                 case QTC_TOP_LEFT:
 173                         m_quadtree.nodes[parent].top_left = new_index;
 174                         break;
 175                 case QTC_TOP_RIGHT:
 176                         m_quadtree.nodes[parent].top_right = new_index;
 177                         break;
 178                 case QTC_BOTTOM_LEFT:
 179                         m_quadtree.nodes[parent].bottom_left = new_index;
 180                         break;
 181                 case QTC_BOTTOM_RIGHT:
 182                         m_quadtree.nodes[parent].bottom_right = new_index;
 183                         break;
 184                 default:
 185                         Fatal("Tried to add a QuadTree child of invalid type!");
 186         }
 187         return new_index;
 188 }
 189
 190 // Reparent a quadtree node, making it the "type" child of a new node.
 191 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 192 {
 193         QuadTreeIndex new_index = m_quadtree.nodes.size();
 194         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
 195
 196         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 197         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 198         {
 199                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 200                 m_objects.types.push_back(m_objects.types[i]);
 201                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 202                 m_count++;
 203         }
 204         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 205         switch (type)
 206         {
 207                 case QTC_TOP_LEFT:
 208                         m_quadtree.nodes[new_index].top_left = child;
 209                         break;
 210                 case QTC_TOP_RIGHT:
 211                         m_quadtree.nodes[new_index].top_right = child;
 212                         break;
 213                 case QTC_BOTTOM_LEFT:
 214                         m_quadtree.nodes[new_index].bottom_left = child;
 215                         break;
 216                 case QTC_BOTTOM_RIGHT:
 217                         m_quadtree.nodes[new_index].bottom_right = child;
 218                         break;
 219                 default:
 220                         Fatal("Tried to add a QuadTree child of invalid type!");
 221         }
 222         return new_index;
 223 }
 224
 225 #endif
 226
 227 void Document::Load(const string & filename)
 228 {
 229         m_objects.bounds.clear();
 230         m_count = 0;
 231         if (filename == "")
 232         {
 233                 Debug("Loaded empty document.");
 234                 return;
 235         }
 236         Debug("Loading document from file \"%s\"", filename.c_str());
 237         FILE * file = fopen(filename.c_str(), "r");
 238         if (file == NULL)
 239                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 240
 241         size_t read;
 242
 243         DocChunkTypes chunk_type;
 244         uint32_t chunk_size;
 245         while (ReadChunkHeader(file, chunk_type, chunk_size))
 246         {
 247                 switch(chunk_type)
 248                 {
 249                 case CT_NUMOBJS:
 250                         read = fread(&m_count, sizeof(m_count), 1, file);
 251                         if (read != 1)
 252                                 Fatal("Failed to read number of objects!");
 253                         Debug("Number of objects: %u", ObjectCount());
 254                         break;
 255                 case CT_OBJTYPES:
 256                         Debug("Object types...");
 257                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 258                         break;
 259                 case CT_OBJBOUNDS:
 260                         Debug("Object bounds...");
 261                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 262                         break;
 263                 case CT_OBJINDICES:
 264                         Debug("Object data indices...");
 265                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 266                         break;
 267                 case CT_OBJBEZIERS:
 268                         Debug("Bezier data...");
 269                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 270                         break;
 271
 272                 case CT_OBJGROUPS:
 273                         Debug("Group data...");
 274                         Warn("Not handled because lazy");
 275                         break;
 276                 }
 277         }
 278         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 279 #ifndef QUADTREE_DISABLED
 280         if (m_quadtree.root_id == QUADTREE_EMPTY)
 281         {
 282                 GenBaseQuadtree();
 283         }
 284 #endif
 285 }
 286
 287 unsigned Document::AddGroup(unsigned start_index, unsigned end_index)
 288 {
 289         Real xmin = 0; Real ymin = 0;
 290         Real xmax = 0; Real ymax = 0;
 291
 292         for (unsigned i = start_index; i <= end_index; ++i)
 293         {
 294                 Rect & objb = m_objects.bounds[i];
 295
 296                 if (i == start_index || objb.x < xmin)
 297                         xmin = objb.x;
 298                 if (i == start_index || (objb.x+objb.w) > xmax)
 299                         xmax = (objb.x+objb.w);
 300
 301                 if (i == start_index || objb.y < ymin)
 302                         ymin = objb.y;
 303                 if (i == start_index || (objb.y+objb.h) > ymax)
 304                         ymax = (objb.y+objb.h);
 305         }
 306
 307         Rect bounds(xmin,ymin, xmax-xmin, ymax-ymin);
 308         unsigned result = Add(GROUP, bounds,0);
 309         m_objects.groups[m_count-1].first = start_index;
 310         m_objects.groups[m_count-1].second = end_index;
 311         return result;
 312 }
 313
 314 /**
 315  * Add a Bezier using Absolute coords
 316  */
 317 unsigned Document::AddBezier(const Bezier & bezier)
 318 {
 319         Rect bounds = bezier.SolveBounds();
 320         Bezier data = bezier.ToRelative(bounds); // Relative
 321         unsigned index = AddBezierData(data);
 322         return Add(BEZIER, bounds, index);
 323 }
 324
 325 unsigned Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 326 {
 327         m_objects.types.push_back(type);
 328         m_objects.bounds.push_back(bounds);
 329         m_objects.data_indices.push_back(data_index);
 330         m_objects.groups.push_back(pair<unsigned, unsigned>(data_index, data_index));
 331         return (m_count++); // Why can't we just use the size of types or something?
 332 }
 333
 334 unsigned Document::AddBezierData(const Bezier & bezier)
 335 {
 336         m_objects.beziers.push_back(bezier);
 337         return m_objects.beziers.size()-1;
 338 }
 339
 340
 341 void Document::DebugDumpObjects()
 342 {
 343         Debug("Objects for Document %p are:", this);
 344         for (unsigned id = 0; id < ObjectCount(); ++id)
 345         {
 346                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 347         }
 348 }
 349
 350 bool Document::operator==(const Document & equ) const
 351 {
 352         return (ObjectCount() == equ.ObjectCount()
 353                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 354                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 355                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 356 }
 357
 358
 359
 360 // Behold my amazing tokenizing abilities
 361 static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
 362 {
 363         token.clear();
 364         while (i < d.size() && iswspace(d[i]))
 365         {
 366                 ++i;
 367         }
 368
 369         while (i < d.size())
 370         {
 371                 if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
 372                 {
 373                         if (token.size() == 0 && !iswspace(d[i]))
 374                         {
 375                                 token += d[i++];
 376                         }
 377                         break;
 378                 }
 379                 token += d[i++];
 380         }
 381         //Debug("Got token \"%s\"", token.c_str());
 382         return token;
 383 }
 384
 385 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
 386 {
 387         string token("");
 388         while (GetToken(d, token, i, delims) == ",");
 389         x = strtod(token.c_str(),NULL);
 390         if (GetToken(d, token, i, delims) != ",")
 391         {
 392                 Fatal("Expected \",\" seperating x,y pair");
 393         }
 394         y = strtod(GetToken(d, token, i, delims).c_str(),NULL);
 395 }
 396
 397 static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
 398 {
 399         Real x0(x);
 400         x = transform.a * x + transform.c * y + transform.e;
 401         y = transform.b * x0 + transform.d * y + transform.f;
 402 }
 403
 404 void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
 405 {
 406         //Debug("Parsing transform %s", s.c_str());
 407         string token;
 408         string command;
 409         unsigned i = 0;
 410
 411         while (i < s.size())
 412         {
 413                 GetToken(s, command, i);
 414                 if (command == "," || command == "" || command == ":")
 415                 {
 416                         if (i < s.size())
 417                                 GetToken(s, command, i);
 418                         else
 419                                 return;
 420                 }
 421                 //Debug("Token is \"%s\"", command.c_str());
 422
 423                 SVGMatrix delta = {1,0,0,0,1,0};
 424
 425
 426                 assert(GetToken(s,token, i) == "(");
 427                 if (command == "translate")
 428                 {
 429                         GetXYPair(s, delta.e, delta.f, i);
 430                         assert(GetToken(s,token, i) == ")");
 431                 }
 432                 else if (command == "matrix")
 433                 {
 434                         GetXYPair(s, delta.a, delta.b,i);
 435                         GetXYPair(s, delta.c, delta.d,i);
 436                         GetXYPair(s, delta.e, delta.f,i);
 437                         assert(GetToken(s,token, i) == ")");
 438                 }
 439                 else if (command == "scale")
 440                 {
 441                         delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
 442                         GetToken(s, token, i);
 443                         if (token == ",")
 444                         {
 445                                 delta.d = (strtod(GetToken(s,token,i).c_str(), NULL));
 446                                 assert(GetToken(s, token, i) == ")");
 447                         }
 448                         else
 449                         {
 450                                 delta.d = delta.a;
 451                                 assert(token == ")");
 452                         }
 453
 454                 }
 455                 else
 456                 {
 457                         Warn("Unrecognised transform \"%s\", using identity", command.c_str());
 458                 }
 459
 460                 //Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 461                 //Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
 462
 463                 SVGMatrix old(transform);
 464                 transform.a = old.a * delta.a + old.c * delta.b;
 465                 transform.c = old.a * delta.c + old.c * delta.d;
 466                 transform.e = old.a * delta.e + old.c * delta.f + old.e;
 467
 468                 transform.b = old.b * delta.a + old.d * delta.b;
 469                 transform.d = old.b * delta.c + old.d * delta.d;
 470                 transform.f = old.b * delta.e + old.d * delta.f + old.f;
 471
 472                 //Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 473         }
 474 }
 475
 476 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
 477 {
 478         //Debug("Parse node <%s>", root.name());
 479
 480
 481         for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
 482         {
 483                 SVGMatrix transform(parent_transform);
 484                 pugi::xml_attribute attrib_trans = child.attribute("transform");
 485                 if (!attrib_trans.empty())
 486                 {
 487                         ParseSVGTransform(attrib_trans.as_string(), transform);
 488                 }
 489
 490                 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
 491                         || strcmp(child.name(), "group") == 0)
 492                 {
 493
 494                         ParseSVGNode(child, transform);
 495                         continue;
 496                 }
 497                 else if (strcmp(child.name(), "path") == 0)
 498                 {
 499                         string d = child.attribute("d").as_string();
 500                         Debug("Path data attribute is \"%s\"", d.c_str());
 501                         pair<unsigned, unsigned> range = ParseSVGPathData(d, transform);
 502                         AddGroup(range.first, range.second);
 503
 504                 }
 505                 else if (strcmp(child.name(), "line") == 0)
 506                 {
 507                         Real x0(child.attribute("x1").as_float());
 508                         Real y0(child.attribute("y1").as_float());
 509                         Real x1(child.attribute("x2").as_float());
 510                         Real y1(child.attribute("y2").as_float());
 511                         TransformXYPair(x0,y0,transform);
 512                         TransformXYPair(x1,y1,transform);
 513                         AddBezier(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
 514                 }
 515                 else if (strcmp(child.name(), "rect") == 0)
 516                 {
 517                         Real coords[4];
 518                         const char * attrib_names[] = {"x", "y", "width", "height"};
 519                         for (size_t i = 0; i < 4; ++i)
 520                                 coords[i] = child.attribute(attrib_names[i]).as_float();
 521
 522                         Real x2(coords[0]+coords[2]);
 523                         Real y2(coords[1]+coords[3]);
 524                         TransformXYPair(coords[0],coords[1],transform); // x, y, transform
 525                         TransformXYPair(x2,y2,transform);
 526                         coords[2] = x2 - coords[0];
 527                         coords[3] = y2 - coords[1];
 528
 529                         bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
 530                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
 531                 }
 532                 else if (strcmp(child.name(), "circle") == 0)
 533                 {
 534                         Real cx = child.attribute("cx").as_float();
 535                         Real cy = child.attribute("cy").as_float();
 536                         Real r = child.attribute("r").as_float();
 537
 538                         Real x = (cx - r);
 539                         Real y = (cy - r);
 540                         TransformXYPair(x,y,transform);
 541                         Real w = Real(2)*r*transform.a; // width scales
 542                         Real h = Real(2)*r*transform.d; // height scales
 543
 544
 545                         Rect rect(x,y,w,h);
 546                         Add(CIRCLE_FILLED, rect,0);
 547                         Debug("Added Circle %s", rect.Str().c_str());
 548                 }
 549                 else if (strcmp(child.name(), "text") == 0)
 550                 {
 551                         Real x = child.attribute("x").as_float();
 552                         Real y = child.attribute("y").as_float();
 553                         TransformXYPair(x,y,transform);
 554                         Debug("Add text \"%s\"", child.child_value());
 555                         AddText(child.child_value(), 0.05, x, y);
 556                 }
 557         }
 558 }
 559
 560 /**
 561  * Parse an SVG string into a rectangle
 562  */
 563 void Document::ParseSVG(const string & input, const Rect & bounds)
 564 {
 565         using namespace pugi;
 566
 567         xml_document doc_xml;
 568         xml_parse_result result = doc_xml.load(input.c_str());
 569
 570         if (!result)
 571                 Error("Couldn't parse SVG input - %s", result.description());
 572
 573         Debug("Loaded XML - %s", result.description());
 574         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 575         ParseSVGNode(doc_xml, transform);
 576 }
 577
 578 /**
 579  * Load an SVG into a rectangle
 580  */
 581 void Document::LoadSVG(const string & filename, const Rect & bounds)
 582 {
 583         using namespace pugi;
 584
 585         xml_document doc_xml;
 586         ifstream input(filename.c_str(), ios_base::in);
 587         xml_parse_result result = doc_xml.load(input);
 588
 589         if (!result)
 590                 Error("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 591
 592         Debug("Loaded XML - %s", result.description());
 593
 594         input.close();
 595                                                 // a c e, b d f
 596         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 597         ParseSVGNode(doc_xml, transform);
 598 }
 599
 600
 601
 602 // Fear the wrath of the tokenizing svg data
 603 // Seriously this isn't really very DOM-like at all is it?
 604 pair<unsigned, unsigned> Document::ParseSVGPathData(const string & d, const SVGMatrix & transform)
 605 {
 606         Real x[4] = {0,0,0,0};
 607         Real y[4] = {0,0,0,0};
 608
 609         string token("");
 610         string command("m");
 611
 612         Real x0(0);
 613         Real y0(0);
 614
 615         unsigned i = 0;
 616         unsigned prev_i = 0;
 617
 618         bool start = false;
 619
 620
 621         static string delims("()[],{}<>;:=LlHhVvmMqQzZcC");
 622
 623         pair<unsigned, unsigned> range(m_count, m_count);
 624
 625         while (i < d.size() && GetToken(d, token, i, delims).size() > 0)
 626         {
 627                 if (isalpha(token[0]))
 628                         command = token;
 629                 else
 630                 {
 631                         i = prev_i; // hax
 632                         if(command == "")
 633                                 command = "L";
 634                 }
 635
 636                 bool relative = islower(command[0]);
 637
 638                 if (command == "m" || command == "M")
 639                 {
 640                         //Debug("Construct moveto command");
 641                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 642                         assert(GetToken(d,token,i,delims) == ",");
 643                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 644
 645                         x[0] = (relative) ? x[0] + dx : dx;
 646                         y[0] = (relative) ? y[0] + dy : dy;
 647
 648                         x0 = x[0];
 649                         y0 = y[0];
 650                         //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 651                         command = (command == "m") ? "l" : "L";
 652                 }
 653                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 654                 {
 655                         //Debug("Construct curveto command");
 656                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 657                         assert(GetToken(d,token,i,delims) == ",");
 658                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 659
 660                         x[1] = (relative) ? x[0] + dx : dx;
 661                         y[1] = (relative) ? y[0] + dy : dy;
 662
 663                         dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 664                         assert(GetToken(d,token,i,delims) == ",");
 665                         dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 666
 667                         x[2] = (relative) ? x[0] + dx : dx;
 668                         y[2] = (relative) ? y[0] + dy : dy;
 669
 670                         if (command != "q" && command != "Q")
 671                         {
 672                                 dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 673                                 assert(GetToken(d,token,i,delims) == ",");
 674                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 675                                 x[3] = (relative) ? x[0] + dx : dx;
 676                                 y[3] = (relative) ? y[0] + dy : dy;
 677                         }
 678                         else
 679                         {
 680                                 x[3] = x[2];
 681                                 y[3] = y[2];
 682                                 Real old_x1(x[1]), old_y1(y[1]);
 683                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 684                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 685                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 686                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 687                         }
 688
 689                         Real x3(x[3]);
 690                         Real y3(y[3]);
 691                         for (int j = 0; j < 4; ++j)
 692                                 TransformXYPair(x[j],y[j], transform);
 693
 694                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 695
 696                         //Debug("[%u] curveto %f,%f %f,%f %f,%f", index, Float(x[1]),Float(y[1]),Float(x[2]),Float(y[2]),Float(x[3]),Float(y[3]));
 697
 698                         x[0] = x3;
 699                         y[0] = y3;
 700
 701
 702                 }
 703                 else if (command == "l" || command == "L" || command == "h" || command == "H" || command == "v" || command == "V")
 704                 {
 705                         Debug("Construct lineto command, relative %d", relative);
 706
 707                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 708                         Real dy;
 709                         if (command == "l" || command == "L")
 710                         {
 711                                 assert(GetToken(d,token,i,delims) == ",");
 712                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 713                         }
 714                         else if (command == "v" || command == "V")
 715                         {
 716                                 swap(dx,dy);
 717                         }
 718
 719                         x[1] = (relative) ? x[0] + dx : dx;
 720                         y[1] = (relative) ? y[0] + dy : dy;
 721                         if (command == "v" || command == "V")
 722                         {
 723                                 x[1] = x[0];
 724                         }
 725                         else if (command == "h" || command == "H")
 726                         {
 727                                 y[1] = y[0];
 728                         }
 729
 730                         Real x1(x[1]);
 731                         Real y1(y[1]);
 732
 733                         TransformXYPair(x[0],y[0],transform);
 734                         TransformXYPair(x[1],y[1],transform);
 735
 736
 737                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
 738
 739                         //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 740
 741                         x[0] = x1;
 742                         y[0] = y1;
 743
 744                 }
 745                 else if (command == "z" || command == "Z")
 746                 {
 747                         //Debug("Construct returnto command");
 748                         x[1] = x0;
 749                         y[1] = y0;
 750                         x[2] = x0;
 751                         y[2] = y0;
 752                         x[3] = x0;
 753                         y[3] = y0;
 754
 755                         Real x3(x[3]);
 756                         Real y3(y[3]);
 757                         for (int j = 0; j < 4; ++j)
 758                                 TransformXYPair(x[j],y[j], transform);
 759
 760                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 761                         //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 762
 763                         x[0] = x3;
 764                         y[0] = y3;
 765                         command = "m";
 766                 }
 767                 else
 768                 {
 769                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 770                         command = "m";
 771                 }
 772
 773                 if (!start)
 774                 {
 775                         x0 = x[0];
 776                         y0 = y[0];
 777                         start = true;
 778                 }
 779                 prev_i = i;
 780         }
 781         return range;
 782 }
 783
 784 void Document::SetFont(const string & font_filename)
 785 {
 786         if (m_font_data != NULL)
 787         {
 788                 free(m_font_data);
 789         }
 790
 791         FILE *font_file = fopen(font_filename.c_str(), "rb");
 792         fseek(font_file, 0, SEEK_END);
 793         size_t font_file_size = ftell(font_file);
 794         fseek(font_file, 0, SEEK_SET);
 795         m_font_data = (unsigned char*)malloc(font_file_size);
 796         size_t read = fread(m_font_data, 1, font_file_size, font_file);
 797         if (read != font_file_size)
 798         {
 799                 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
 800         }
 801         fclose(font_file);
 802         stbtt_InitFont(&m_font, m_font_data, 0);
 803 }
 804
 805 void Document::AddText(const string & text, Real scale, Real x, Real y)
 806 {
 807         if (m_font_data == NULL)
 808         {
 809                 Warn("No font loaded");
 810                 return;
 811         }
 812
 813         Real x0(x);
 814         //Real y0(y);
 815         int ascent = 0, descent = 0, line_gap = 0;
 816         stbtt_GetFontVMetrics(&m_font, &ascent, &descent, &line_gap);
 817         float font_scale = scale / (float)(ascent - descent);
 818         Real y_advance = Real(font_scale) * Real(ascent - descent + line_gap);
 819         for (unsigned i = 0; i < text.size(); ++i)
 820         {
 821                 if (text[i] == '\n')
 822                 {
 823                         y += y_advance;
 824                         x = x0;
 825                 }
 826                 if (!isprint(text[i]))
 827                         continue;
 828
 829                 int advance_width = 0, left_side_bearing = 0, kerning = 0;
 830                 stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
 831                 if (i >= 1)
 832                 {
 833                         kerning = stbtt_GetCodepointKernAdvance(&m_font, text[i-1], text[i]);
 834                 }
 835                 x += Real(font_scale) * Real(kerning);
 836                 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
 837                 x += Real(font_scale) * Real(advance_width);
 838         }
 839 }
 840
 841 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 842 {
 843         int glyph_index = stbtt_FindGlyphIndex(font, character);
 844
 845         // Check if there is actully a glyph to render.
 846         if (stbtt_IsGlyphEmpty(font, glyph_index))
 847         {
 848                 return;
 849         }
 850
 851         stbtt_vertex *instructions;
 852         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 853
 854         Real current_x(0), current_y(0);
 855         unsigned start_index = m_count;
 856         unsigned end_index = m_count;
 857         for (int i = 0; i < num_instructions; ++i)
 858         {
 859                 // TTF uses 16-bit signed ints for coordinates:
 860                 // with the y-axis inverted compared to us.
 861                 // Convert and scale any data.
 862                 Real inst_x = Real(instructions[i].x)*scale;
 863                 Real inst_y = Real(instructions[i].y)*-scale;
 864                 Real inst_cx = Real(instructions[i].cx)*scale;
 865                 Real inst_cy = Real(instructions[i].cy)*-scale;
 866                 Real old_x(current_x), old_y(current_y);
 867                 current_x = inst_x;
 868                 current_y = inst_y;
 869
 870                 switch(instructions[i].type)
 871                 {
 872                 // Move To
 873                 case STBTT_vmove:
 874                         break;
 875                 // Line To
 876                 case STBTT_vline:
 877                         end_index = AddBezier(Bezier(old_x + x, old_y + y, old_x + x, old_y + y, current_x + x, current_y + y, current_x + x, current_y + y));
 878                         break;
 879                 // Quadratic Bezier To:
 880                 case STBTT_vcurve:
 881                         // Quadratic -> Cubic:
 882                         // - Endpoints are the same.
 883                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
 884                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
 885                         end_index = AddBezier(Bezier(old_x + x, old_y + y, old_x + Real(2)*(inst_cx-old_x)/Real(3) + x, old_y + Real(2)*(inst_cy-old_y)/Real(3) + y,
 886                                                 current_x + Real(2)*(inst_cx-current_x)/Real(3) + x, current_y + Real(2)*(inst_cy-current_y)/Real(3) + y, current_x + x, current_y + y));
 887                         break;
 888                 }
 889         }
 890
 891         if (start_index < m_count && end_index < m_count)
 892         {
 893                 AddGroup(start_index, end_index);
 894         }
 895         Debug("Added Glyph \"%c\" at %f %f, scale %f", (char)character, Float(x), Float(y), Float(scale));
 896
 897         stbtt_FreeShape(font, instructions);
 898 }