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 obj_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 136                 if (obj_bounds.x < 0)
 137                 {
 138                         obj_bounds.w += obj_bounds.x;
 139                         obj_bounds.x = 0;
 140                 }
 141                 if (obj_bounds.y < 0)
 142                 {
 143                         obj_bounds.h += obj_bounds.y;
 144                         obj_bounds.y = 0;
 145                 }
 146                 if (obj_bounds.x + obj_bounds.w > 1)
 147                 {
 148                         obj_bounds.w += (1 - (obj_bounds.x + obj_bounds.w));
 149                 }
 150                 if (obj_bounds.y + obj_bounds.h > 1)
 151                 {
 152                         obj_bounds.h += (1 - (obj_bounds.y + obj_bounds.h));
 153                 }
 154                 Rect child_node_bounds = TransformFromQuadChild(obj_bounds, type);
 155                 Rect clip_bezier_bounds = TransformRectCoordinates(m_objects.bounds[object_id], child_node_bounds);
 156                 std::vector<Bezier> new_curves = Bezier(m_objects.beziers[m_objects.data_indices[object_id]], child_node_bounds).ClipToRectangle(clip_bezier_bounds);
 157                 for (size_t i = 0; i < new_curves.size(); ++i)
 158                 {
 159                         Rect new_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 160                         //new_bounds = TransformToQuadChild(new_curves[i].SolveBounds(), type);
 161                         //Bezier new_curve_data = new_curves[i].ToRelative(new_bounds);
 162                         unsigned index = AddBezierData(new_curves[i]);
 163                         m_objects.bounds.push_back(new_bounds);
 164                         m_objects.types.push_back(BEZIER);
 165                         m_objects.data_indices.push_back(index);
 166                 }
 167                 return new_curves.size();
 168                 }
 169         default:
 170                 Debug("Adding %s -> %s", m_objects.bounds[object_id].Str().c_str(), TransformToQuadChild(m_objects.bounds[object_id], type).Str().c_str());
 171                 m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 172                 m_objects.types.push_back(m_objects.types[object_id]);
 173                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 174                 return 1;
 175         }
 176         return 0;
 177 }
 178 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 179 {
 180         QuadTreeIndex new_index = m_quadtree.nodes.size();
 181         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 182
 183         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 184         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 185         {
 186                 if (IntersectsQuadChild(m_objects.bounds[i], type))
 187                 {
 188                         m_count += ClipObjectToQuadChild(i, type);
 189                 }
 190         }
 191         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 192         switch (type)
 193         {
 194                 case QTC_TOP_LEFT:
 195                         m_quadtree.nodes[parent].top_left = new_index;
 196                         break;
 197                 case QTC_TOP_RIGHT:
 198                         m_quadtree.nodes[parent].top_right = new_index;
 199                         break;
 200                 case QTC_BOTTOM_LEFT:
 201                         m_quadtree.nodes[parent].bottom_left = new_index;
 202                         break;
 203                 case QTC_BOTTOM_RIGHT:
 204                         m_quadtree.nodes[parent].bottom_right = new_index;
 205                         break;
 206                 default:
 207                         Fatal("Tried to add a QuadTree child of invalid type!");
 208         }
 209         return new_index;
 210 }
 211
 212 // Reparent a quadtree node, making it the "type" child of a new node.
 213 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 214 {
 215         QuadTreeIndex new_index = m_quadtree.nodes.size();
 216         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
 217
 218         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 219         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 220         {
 221                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 222                 m_objects.types.push_back(m_objects.types[i]);
 223                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 224                 m_count++;
 225         }
 226         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 227         switch (type)
 228         {
 229                 case QTC_TOP_LEFT:
 230                         m_quadtree.nodes[new_index].top_left = child;
 231                         break;
 232                 case QTC_TOP_RIGHT:
 233                         m_quadtree.nodes[new_index].top_right = child;
 234                         break;
 235                 case QTC_BOTTOM_LEFT:
 236                         m_quadtree.nodes[new_index].bottom_left = child;
 237                         break;
 238                 case QTC_BOTTOM_RIGHT:
 239                         m_quadtree.nodes[new_index].bottom_right = child;
 240                         break;
 241                 default:
 242                         Fatal("Tried to add a QuadTree child of invalid type!");
 243         }
 244         return new_index;
 245 }
 246
 247 #endif
 248
 249 void Document::Load(const string & filename)
 250 {
 251         m_objects.bounds.clear();
 252         m_count = 0;
 253         if (filename == "")
 254         {
 255                 Debug("Loaded empty document.");
 256                 return;
 257         }
 258         Debug("Loading document from file \"%s\"", filename.c_str());
 259         FILE * file = fopen(filename.c_str(), "r");
 260         if (file == NULL)
 261                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 262
 263         size_t read;
 264
 265         DocChunkTypes chunk_type;
 266         uint32_t chunk_size;
 267         while (ReadChunkHeader(file, chunk_type, chunk_size))
 268         {
 269                 switch(chunk_type)
 270                 {
 271                 case CT_NUMOBJS:
 272                         read = fread(&m_count, sizeof(m_count), 1, file);
 273                         if (read != 1)
 274                                 Fatal("Failed to read number of objects!");
 275                         Debug("Number of objects: %u", ObjectCount());
 276                         break;
 277                 case CT_OBJTYPES:
 278                         Debug("Object types...");
 279                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 280                         break;
 281                 case CT_OBJBOUNDS:
 282                         Debug("Object bounds...");
 283                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 284                         break;
 285                 case CT_OBJINDICES:
 286                         Debug("Object data indices...");
 287                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 288                         break;
 289                 case CT_OBJBEZIERS:
 290                         Debug("Bezier data...");
 291                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 292                         break;
 293
 294                 case CT_OBJPATHS:
 295                         Debug("Path data...");
 296                         Warn("Not handled because lazy");
 297                         break;
 298                 }
 299         }
 300         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 301 #ifndef QUADTREE_DISABLED
 302         if (m_quadtree.root_id == QUADTREE_EMPTY)
 303         {
 304                 GenBaseQuadtree();
 305         }
 306 #endif
 307 }
 308
 309 unsigned Document::AddPath(unsigned start_index, unsigned end_index, const Colour & fill)
 310 {
 311         Path path(m_objects, start_index, end_index, fill);
 312         unsigned data_index = AddPathData(path);
 313         Rect bounds = path.SolveBounds(m_objects);
 314         unsigned result = Add(PATH, bounds,data_index);
 315         return result;
 316 }
 317
 318 /**
 319  * Add a Bezier using Absolute coords
 320  */
 321 unsigned Document::AddBezier(const Bezier & bezier)
 322 {
 323         Rect bounds = bezier.SolveBounds();
 324         Bezier data = bezier.ToRelative(bounds); // Relative
 325         if (data.ToAbsolute(bounds) != bezier)
 326         {
 327                 Error("%s != %s", data.ToAbsolute(Rect(0,0,1,1)).Str().c_str(),
 328                         bezier.Str().c_str());
 329                 Fatal("ToAbsolute on ToRelative does not give original Bezier");
 330         }
 331         unsigned index = AddBezierData(data);
 332         return Add(BEZIER, bounds, index);
 333 }
 334
 335 unsigned Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 336 {
 337         m_objects.types.push_back(type);
 338         m_objects.bounds.push_back(bounds);
 339         m_objects.data_indices.push_back(data_index);
 340         return (m_count++); // Why can't we just use the size of types or something?
 341 }
 342
 343 unsigned Document::AddBezierData(const Bezier & bezier)
 344 {
 345         m_objects.beziers.push_back(bezier);
 346         return m_objects.beziers.size()-1;
 347 }
 348
 349 unsigned Document::AddPathData(const Path & path)
 350 {
 351         m_objects.paths.push_back(path);
 352         return m_objects.paths.size()-1;
 353 }
 354
 355 void Document::DebugDumpObjects()
 356 {
 357         Debug("Objects for Document %p are:", this);
 358         for (unsigned id = 0; id < ObjectCount(); ++id)
 359         {
 360                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 361         }
 362 }
 363
 364 bool Document::operator==(const Document & equ) const
 365 {
 366         return (ObjectCount() == equ.ObjectCount()
 367                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 368                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 369                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 370 }
 371
 372
 373
 374 // Behold my amazing tokenizing abilities
 375 static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
 376 {
 377         token.clear();
 378         while (i < d.size() && iswspace(d[i]))
 379         {
 380                 ++i;
 381         }
 382
 383         while (i < d.size())
 384         {
 385                 if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
 386                 {
 387                         if (token.size() == 0 && !iswspace(d[i]))
 388                         {
 389                                 token += d[i++];
 390                         }
 391                         break;
 392                 }
 393                 token += d[i++];
 394         }
 395         //Debug("Got token \"%s\"", token.c_str());
 396         return token;
 397 }
 398
 399 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
 400 {
 401         string token("");
 402         while (GetToken(d, token, i, delims) == ",");
 403         x = strtod(token.c_str(),NULL);
 404         if (GetToken(d, token, i, delims) != ",")
 405         {
 406                 Fatal("Expected \",\" seperating x,y pair");
 407         }
 408         y = strtod(GetToken(d, token, i, delims).c_str(),NULL);
 409 }
 410
 411 static bool GetKeyValuePair(const string & d, string & key, string & value, unsigned & i, const string & delims = "()[],{}<>;:=")
 412 {
 413         key = "";
 414         string token;
 415         while (GetToken(d, token, i, delims) == ":" || token == ";");
 416         key = token;
 417         if (GetToken(d, token, i, delims) != ":")
 418         {
 419                 Error("Expected \":\" seperating key:value pair");
 420                 return false;
 421         }
 422         value = "";
 423         GetToken(d, value, i, delims);
 424         return true;
 425 }
 426
 427 static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
 428 {
 429         Real x0(x);
 430         x = transform.a * x + transform.c * y + transform.e;
 431         y = transform.b * x0 + transform.d * y + transform.f;
 432 }
 433
 434 void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
 435 {
 436         //Debug("Parsing transform %s", s.c_str());
 437         string token;
 438         string command;
 439         unsigned i = 0;
 440
 441         while (i < s.size())
 442         {
 443                 GetToken(s, command, i);
 444                 if (command == "," || command == "" || command == ":")
 445                 {
 446                         if (i < s.size())
 447                                 GetToken(s, command, i);
 448                         else
 449                                 return;
 450                 }
 451                 //Debug("Token is \"%s\"", command.c_str());
 452
 453                 SVGMatrix delta = {1,0,0,0,1,0};
 454
 455
 456                 assert(GetToken(s,token, i) == "(");
 457                 if (command == "translate")
 458                 {
 459                         GetXYPair(s, delta.e, delta.f, i);
 460                         assert(GetToken(s,token, i) == ")");
 461                 }
 462                 else if (command == "matrix")
 463                 {
 464                         GetXYPair(s, delta.a, delta.b,i);
 465                         GetXYPair(s, delta.c, delta.d,i);
 466                         GetXYPair(s, delta.e, delta.f,i);
 467                         assert(GetToken(s,token, i) == ")");
 468                 }
 469                 else if (command == "scale")
 470                 {
 471                         delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
 472                         GetToken(s, token, i);
 473                         if (token == ",")
 474                         {
 475                                 delta.d = (strtod(GetToken(s,token,i).c_str(), NULL));
 476                                 assert(GetToken(s, token, i) == ")");
 477                         }
 478                         else
 479                         {
 480                                 delta.d = delta.a;
 481                                 assert(token == ")");
 482                         }
 483
 484                 }
 485                 else
 486                 {
 487                         Warn("Unrecognised transform \"%s\", using identity", command.c_str());
 488                 }
 489
 490                 //Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 491                 //Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
 492
 493                 SVGMatrix old(transform);
 494                 transform.a = old.a * delta.a + old.c * delta.b;
 495                 transform.c = old.a * delta.c + old.c * delta.d;
 496                 transform.e = old.a * delta.e + old.c * delta.f + old.e;
 497
 498                 transform.b = old.b * delta.a + old.d * delta.b;
 499                 transform.d = old.b * delta.c + old.d * delta.d;
 500                 transform.f = old.b * delta.e + old.d * delta.f + old.f;
 501
 502                 //Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 503         }
 504 }
 505
 506 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
 507 {
 508         //Debug("Parse node <%s>", root.name());
 509
 510
 511         for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
 512         {
 513                 SVGMatrix transform(parent_transform);
 514                 pugi::xml_attribute attrib_trans = child.attribute("transform");
 515                 if (!attrib_trans.empty())
 516                 {
 517                         ParseSVGTransform(attrib_trans.as_string(), transform);
 518                 }
 519
 520
 521
 522                 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
 523                         || strcmp(child.name(), "group") == 0)
 524                 {
 525
 526                         ParseSVGNode(child, transform);
 527                         continue;
 528                 }
 529                 else if (strcmp(child.name(), "path") == 0)
 530                 {
 531                         string d = child.attribute("d").as_string();
 532                         //Debug("Path data attribute is \"%s\"", d.c_str());
 533                         bool closed = false;
 534                         pair<unsigned, unsigned> range = ParseSVGPathData(d, transform, closed);
 535                         if (closed)
 536                         {
 537                                 Colour c(0,0,0,0);
 538                                 string colour_str("");
 539                                 map<string, string> style;
 540                                 if (child.attribute("style"))
 541                                 {
 542                                         ParseSVGStyleData(child.attribute("style").as_string(), style);
 543                                 }
 544
 545                                 // Determine shading colour
 546                                 if (child.attribute("fill"))
 547                                 {
 548                                         colour_str = child.attribute("fill").as_string();
 549                                 }
 550                                 else if (style.find("fill") != style.end())
 551                                 {
 552                                         colour_str = style["fill"];
 553                                 }
 554                                 if (colour_str == "red")
 555                                         c = {1,0,0,1};
 556                                 else if (colour_str == "blue")
 557                                         c = {0,0,1,1};
 558                                 else if (colour_str == "green")
 559                                         c = {0,1,0,1};
 560                                 else if (colour_str == "black")
 561                                         c = {0,0,0,1};
 562                                 else if (colour_str == "white")
 563                                         c = {1,1,1,1};
 564                                 else if (colour_str.size() == 7 && colour_str[0] == '#')
 565                                 {
 566                                         Debug("Parse colour string: \"%s\"", colour_str.c_str());
 567                                         char comp[2] = {colour_str[1], colour_str[2]};
 568                                         c.r = Real(strtoul(comp, NULL, 16))/Real(255);
 569                                         comp[0] = colour_str[3]; comp[1] = colour_str[4];
 570                                         c.g = Real(strtoul(comp, NULL, 16))/Real(255);
 571                                         comp[0] = colour_str[5]; comp[1] = colour_str[6];
 572                                         c.b = Real(strtoul(comp, NULL, 16))/Real(255);
 573                                         c.a = 1;
 574                                         Debug("Colour is: %f, %f, %f, %f", Float(c.r), Float(c.g), Float(c.b), Float(c.a));
 575                                 }
 576
 577                                 // Determin shading alpha
 578                                 if (child.attribute("fill-opacity"))
 579                                 {
 580                                         c.a = child.attribute("fill-opacity").as_float();
 581                                 }
 582                                 else if (style.find("fill-opacity") != style.end())
 583                                 {
 584                                         c.a = strtod(style["fill-opacity"].c_str(), NULL);
 585                                 }
 586
 587                                         Debug("fill-opacity is %f", Float(c.a));
 588                                 AddPath(range.first, range.second, c);
 589                         }
 590
 591                 }
 592                 else if (strcmp(child.name(), "line") == 0)
 593                 {
 594                         Real x0(child.attribute("x1").as_float());
 595                         Real y0(child.attribute("y1").as_float());
 596                         Real x1(child.attribute("x2").as_float());
 597                         Real y1(child.attribute("y2").as_float());
 598                         TransformXYPair(x0,y0,transform);
 599                         TransformXYPair(x1,y1,transform);
 600                         AddBezier(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
 601                 }
 602                 else if (strcmp(child.name(), "rect") == 0)
 603                 {
 604                         Real coords[4];
 605                         const char * attrib_names[] = {"x", "y", "width", "height"};
 606                         for (size_t i = 0; i < 4; ++i)
 607                                 coords[i] = child.attribute(attrib_names[i]).as_float();
 608
 609                         Real x2(coords[0]+coords[2]);
 610                         Real y2(coords[1]+coords[3]);
 611                         TransformXYPair(coords[0],coords[1],transform); // x, y, transform
 612                         TransformXYPair(x2,y2,transform);
 613                         coords[2] = x2 - coords[0];
 614                         coords[3] = y2 - coords[1];
 615
 616                         bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
 617                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
 618                 }
 619                 else if (strcmp(child.name(), "circle") == 0)
 620                 {
 621                         Real cx = child.attribute("cx").as_float();
 622                         Real cy = child.attribute("cy").as_float();
 623                         Real r = child.attribute("r").as_float();
 624
 625                         Real x = (cx - r);
 626                         Real y = (cy - r);
 627                         TransformXYPair(x,y,transform);
 628                         Real w = Real(2)*r*transform.a; // width scales
 629                         Real h = Real(2)*r*transform.d; // height scales
 630
 631
 632                         Rect rect(x,y,w,h);
 633                         Add(CIRCLE_FILLED, rect,0);
 634                         Debug("Added Circle %s", rect.Str().c_str());
 635                 }
 636                 else if (strcmp(child.name(), "text") == 0)
 637                 {
 638                         Real x = child.attribute("x").as_float();
 639                         Real y = child.attribute("y").as_float();
 640                         TransformXYPair(x,y,transform);
 641                         Debug("Add text \"%s\"", child.child_value());
 642                         AddText(child.child_value(), 0.05, x, y);
 643                 }
 644         }
 645 }
 646
 647 void Document::ParseSVGStyleData(const string & style, map<string, string> & results)
 648 {
 649         unsigned i = 0;
 650         string key;
 651         string value;
 652         while (i < style.size() && GetKeyValuePair(style, key, value, i))
 653         {
 654                 results[key] = value;
 655         }
 656 }
 657
 658 /**
 659  * Parse an SVG string into a rectangle
 660  */
 661 void Document::ParseSVG(const string & input, const Rect & bounds)
 662 {
 663         using namespace pugi;
 664
 665         xml_document doc_xml;
 666         xml_parse_result result = doc_xml.load(input.c_str());
 667
 668         if (!result)
 669                 Error("Couldn't parse SVG input - %s", result.description());
 670
 671         Debug("Loaded XML - %s", result.description());
 672         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 673         ParseSVGNode(doc_xml, transform);
 674 }
 675
 676 /**
 677  * Load an SVG into a rectangle
 678  */
 679 void Document::LoadSVG(const string & filename, const Rect & bounds)
 680 {
 681         using namespace pugi;
 682
 683         xml_document doc_xml;
 684         ifstream input(filename.c_str(), ios_base::in);
 685         xml_parse_result result = doc_xml.load(input);
 686
 687         if (!result)
 688                 Error("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 689
 690         Debug("Loaded XML - %s", result.description());
 691
 692         input.close();
 693                                                 // a c e, b d f
 694         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 695         ParseSVGNode(doc_xml, transform);
 696 }
 697
 698
 699
 700 // Fear the wrath of the tokenizing svg data
 701 // Seriously this isn't really very DOM-like at all is it?
 702 pair<unsigned, unsigned> Document::ParseSVGPathData(const string & d, const SVGMatrix & transform, bool & closed)
 703 {
 704         closed = false;
 705         Real x[4] = {0,0,0,0};
 706         Real y[4] = {0,0,0,0};
 707
 708         string token("");
 709         string command("m");
 710
 711         Real x0(0);
 712         Real y0(0);
 713
 714         unsigned i = 0;
 715         unsigned prev_i = 0;
 716
 717         bool start = false;
 718
 719
 720         static string delims("()[],{}<>;:=LlHhVvmMqQzZcC");
 721
 722         pair<unsigned, unsigned> range(m_count, m_count);
 723
 724         while (i < d.size() && GetToken(d, token, i, delims).size() > 0)
 725         {
 726                 if (isalpha(token[0]))
 727                         command = token;
 728                 else
 729                 {
 730                         i = prev_i; // hax
 731                         if(command == "")
 732                                 command = "L";
 733                 }
 734
 735                 bool relative = islower(command[0]);
 736
 737                 if (command == "m" || command == "M")
 738                 {
 739                         //Debug("Construct moveto command");
 740                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 741                         assert(GetToken(d,token,i,delims) == ",");
 742                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 743
 744                         x[0] = (relative) ? x[0] + dx : dx;
 745                         y[0] = (relative) ? y[0] + dy : dy;
 746
 747                         x0 = x[0];
 748                         y0 = y[0];
 749                         //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 750                         command = (command == "m") ? "l" : "L";
 751                 }
 752                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 753                 {
 754                         //Debug("Construct curveto command");
 755                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 756                         assert(GetToken(d,token,i,delims) == ",");
 757                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 758
 759                         x[1] = (relative) ? x[0] + dx : dx;
 760                         y[1] = (relative) ? y[0] + dy : dy;
 761
 762                         dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 763                         assert(GetToken(d,token,i,delims) == ",");
 764                         dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 765
 766                         x[2] = (relative) ? x[0] + dx : dx;
 767                         y[2] = (relative) ? y[0] + dy : dy;
 768
 769                         if (command != "q" && command != "Q")
 770                         {
 771                                 dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 772                                 assert(GetToken(d,token,i,delims) == ",");
 773                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 774                                 x[3] = (relative) ? x[0] + dx : dx;
 775                                 y[3] = (relative) ? y[0] + dy : dy;
 776                         }
 777                         else
 778                         {
 779                                 x[3] = x[2];
 780                                 y[3] = y[2];
 781                                 Real old_x1(x[1]), old_y1(y[1]);
 782                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 783                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 784                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 785                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 786                         }
 787
 788                         Real x3(x[3]);
 789                         Real y3(y[3]);
 790                         for (int j = 0; j < 4; ++j)
 791                                 TransformXYPair(x[j],y[j], transform);
 792
 793                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 794
 795                         //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]));
 796
 797                         x[0] = x3;
 798                         y[0] = y3;
 799
 800
 801                 }
 802                 else if (command == "l" || command == "L" || command == "h" || command == "H" || command == "v" || command == "V")
 803                 {
 804                         //Debug("Construct lineto command, relative %d", relative);
 805
 806                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 807                         Real dy;
 808                         if (command == "l" || command == "L")
 809                         {
 810                                 assert(GetToken(d,token,i,delims) == ",");
 811                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 812                         }
 813                         else if (command == "v" || command == "V")
 814                         {
 815                                 swap(dx,dy);
 816                         }
 817
 818                         x[1] = (relative) ? x[0] + dx : dx;
 819                         y[1] = (relative) ? y[0] + dy : dy;
 820                         if (command == "v" || command == "V")
 821                         {
 822                                 x[1] = x[0];
 823                         }
 824                         else if (command == "h" || command == "H")
 825                         {
 826                                 y[1] = y[0];
 827                         }
 828
 829                         Real x1(x[1]);
 830                         Real y1(y[1]);
 831
 832                         TransformXYPair(x[0],y[0],transform);
 833                         TransformXYPair(x[1],y[1],transform);
 834
 835
 836                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
 837
 838                         //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 839
 840                         x[0] = x1;
 841                         y[0] = y1;
 842
 843                 }
 844                 else if (command == "z" || command == "Z")
 845                 {
 846                         //Debug("Construct returnto command");
 847                         x[1] = x0;
 848                         y[1] = y0;
 849                         x[2] = x0;
 850                         y[2] = y0;
 851                         x[3] = x0;
 852                         y[3] = y0;
 853
 854                         Real x3(x[3]);
 855                         Real y3(y[3]);
 856                         for (int j = 0; j < 4; ++j)
 857                                 TransformXYPair(x[j],y[j], transform);
 858
 859                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 860                         //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 861
 862                         x[0] = x3;
 863                         y[0] = y3;
 864                         command = "m";
 865                         closed = true;
 866                 }
 867                 else
 868                 {
 869                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 870                         command = "m";
 871                 }
 872
 873                 if (!start)
 874                 {
 875                         x0 = x[0];
 876                         y0 = y[0];
 877                         start = true;
 878                 }
 879                 prev_i = i;
 880         }
 881         return range;
 882 }
 883
 884 void Document::SetFont(const string & font_filename)
 885 {
 886         if (m_font_data != NULL)
 887         {
 888                 free(m_font_data);
 889         }
 890
 891         FILE *font_file = fopen(font_filename.c_str(), "rb");
 892         fseek(font_file, 0, SEEK_END);
 893         size_t font_file_size = ftell(font_file);
 894         fseek(font_file, 0, SEEK_SET);
 895         m_font_data = (unsigned char*)malloc(font_file_size);
 896         size_t read = fread(m_font_data, 1, font_file_size, font_file);
 897         if (read != font_file_size)
 898         {
 899                 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
 900         }
 901         fclose(font_file);
 902         stbtt_InitFont(&m_font, m_font_data, 0);
 903 }
 904
 905 void Document::AddText(const string & text, Real scale, Real x, Real y)
 906 {
 907         if (m_font_data == NULL)
 908         {
 909                 Warn("No font loaded");
 910                 return;
 911         }
 912
 913         Real x0(x);
 914         //Real y0(y);
 915         int ascent = 0, descent = 0, line_gap = 0;
 916         stbtt_GetFontVMetrics(&m_font, &ascent, &descent, &line_gap);
 917         float font_scale = scale / (float)(ascent - descent);
 918         Real y_advance = Real(font_scale) * Real(ascent - descent + line_gap);
 919         for (unsigned i = 0; i < text.size(); ++i)
 920         {
 921                 if (text[i] == '\n')
 922                 {
 923                         y += y_advance;
 924                         x = x0;
 925                 }
 926                 if (!isprint(text[i]))
 927                         continue;
 928
 929                 int advance_width = 0, left_side_bearing = 0, kerning = 0;
 930                 stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
 931                 if (i >= 1)
 932                 {
 933                         kerning = stbtt_GetCodepointKernAdvance(&m_font, text[i-1], text[i]);
 934                 }
 935                 x += Real(font_scale) * Real(kerning);
 936                 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
 937                 x += Real(font_scale) * Real(advance_width);
 938         }
 939 }
 940
 941 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 942 {
 943         int glyph_index = stbtt_FindGlyphIndex(font, character);
 944
 945         // Check if there is actully a glyph to render.
 946         if (stbtt_IsGlyphEmpty(font, glyph_index))
 947         {
 948                 return;
 949         }
 950
 951         stbtt_vertex *instructions;
 952         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 953
 954         Real current_x(0), current_y(0);
 955         unsigned start_index = m_count;
 956         unsigned end_index = m_count;
 957         for (int i = 0; i < num_instructions; ++i)
 958         {
 959                 // TTF uses 16-bit signed ints for coordinates:
 960                 // with the y-axis inverted compared to us.
 961                 // Convert and scale any data.
 962                 Real inst_x = Real(instructions[i].x)*scale;
 963                 Real inst_y = Real(instructions[i].y)*-scale;
 964                 Real inst_cx = Real(instructions[i].cx)*scale;
 965                 Real inst_cy = Real(instructions[i].cy)*-scale;
 966                 Real old_x(current_x), old_y(current_y);
 967                 current_x = inst_x;
 968                 current_y = inst_y;
 969
 970                 switch(instructions[i].type)
 971                 {
 972                 // Move To
 973                 case STBTT_vmove:
 974                         break;
 975                 // Line To
 976                 case STBTT_vline:
 977                         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));
 978                         break;
 979                 // Quadratic Bezier To:
 980                 case STBTT_vcurve:
 981                         // Quadratic -> Cubic:
 982                         // - Endpoints are the same.
 983                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
 984                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
 985                         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,
 986                                                 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));
 987                         break;
 988                 }
 989         }
 990
 991         if (start_index < m_count && end_index < m_count)
 992         {
 993                 AddPath(start_index, end_index);
 994         }
 995         Debug("Added Glyph \"%c\" at %f %f, scale %f", (char)character, Float(x), Float(y), Float(scale));
 996
 997         stbtt_FreeShape(font, instructions);
 998 }