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