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         case PATH:
 109                 {
 110                 Rect obj_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 111                 if (obj_bounds.x < 0)
 112                 {
 113                         obj_bounds.w += obj_bounds.x;
 114                         obj_bounds.x = 0;
 115                 }
 116                 if (obj_bounds.y < 0)
 117                 {
 118                         obj_bounds.h += obj_bounds.y;
 119                         obj_bounds.y = 0;
 120                 }
 121                 if (obj_bounds.x + obj_bounds.w > 1)
 122                 {
 123                         obj_bounds.w += (1 - (obj_bounds.x + obj_bounds.w));
 124                 }
 125                 if (obj_bounds.y + obj_bounds.h > 1)
 126                 {
 127                         obj_bounds.h += (1 - (obj_bounds.y + obj_bounds.h));
 128                 }
 129                 m_objects.bounds.push_back(obj_bounds);
 130                 m_objects.types.push_back(m_objects.types[object_id]);
 131                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 132                 return 1;
 133                 }
 134         case BEZIER:
 135                 {
 136                 // If we're entirely within the quadtree node, no clipping need occur.
 137                 if (ContainedInQuadChild(m_objects.bounds[object_id], type))
 138                 {
 139                         m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 140                         m_objects.types.push_back(m_objects.types[object_id]);
 141                         m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 142                         return 1;
 143                 }
 144                 Rect clip_bezier_bounds = TransformRectCoordinates(m_objects.bounds[object_id], TransformFromQuadChild(Rect{0,0,1,1}, type));
 145                 std::vector<Bezier> new_curves = m_objects.beziers[m_objects.data_indices[object_id]].ClipToRectangle(clip_bezier_bounds);
 146                 for (size_t i = 0; i < new_curves.size(); ++i)
 147                 {
 148                         Rect new_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 149                         Bezier new_curve_data = new_curves[i].ToAbsolute(TransformToQuadChild(m_objects.bounds[object_id],type));
 150                         new_bounds = new_curve_data.SolveBounds();
 151                         Debug("New bounds: %s", new_bounds.Str().c_str());
 152                         new_curve_data = new_curve_data.ToRelative(new_bounds);
 153                         unsigned index = AddBezierData(new_curve_data);
 154                         m_objects.bounds.push_back(new_bounds);
 155                         m_objects.types.push_back(BEZIER);
 156                         m_objects.data_indices.push_back(index);
 157                 }
 158                 return new_curves.size();
 159                 }
 160         default:
 161                 Debug("Adding %s -> %s", m_objects.bounds[object_id].Str().c_str(), TransformToQuadChild(m_objects.bounds[object_id], type).Str().c_str());
 162                 m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 163                 m_objects.types.push_back(m_objects.types[object_id]);
 164                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 165                 return 1;
 166         }
 167         return 0;
 168 }
 169 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 170 {
 171         QuadTreeIndex new_index = m_quadtree.nodes.size();
 172         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 173
 174         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 175         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 176         {
 177                 if (IntersectsQuadChild(m_objects.bounds[i], type))
 178                 {
 179                         m_count += ClipObjectToQuadChild(i, type);
 180                 }
 181         }
 182         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 183         switch (type)
 184         {
 185                 case QTC_TOP_LEFT:
 186                         m_quadtree.nodes[parent].top_left = new_index;
 187                         break;
 188                 case QTC_TOP_RIGHT:
 189                         m_quadtree.nodes[parent].top_right = new_index;
 190                         break;
 191                 case QTC_BOTTOM_LEFT:
 192                         m_quadtree.nodes[parent].bottom_left = new_index;
 193                         break;
 194                 case QTC_BOTTOM_RIGHT:
 195                         m_quadtree.nodes[parent].bottom_right = new_index;
 196                         break;
 197                 default:
 198                         Fatal("Tried to add a QuadTree child of invalid type!");
 199         }
 200         return new_index;
 201 }
 202
 203 // Reparent a quadtree node, making it the "type" child of a new node.
 204 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 205 {
 206         QuadTreeIndex new_index = m_quadtree.nodes.size();
 207         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
 208
 209         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 210         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 211         {
 212                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 213                 m_objects.types.push_back(m_objects.types[i]);
 214                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 215                 m_count++;
 216         }
 217         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 218         switch (type)
 219         {
 220                 case QTC_TOP_LEFT:
 221                         m_quadtree.nodes[new_index].top_left = child;
 222                         break;
 223                 case QTC_TOP_RIGHT:
 224                         m_quadtree.nodes[new_index].top_right = child;
 225                         break;
 226                 case QTC_BOTTOM_LEFT:
 227                         m_quadtree.nodes[new_index].bottom_left = child;
 228                         break;
 229                 case QTC_BOTTOM_RIGHT:
 230                         m_quadtree.nodes[new_index].bottom_right = child;
 231                         break;
 232                 default:
 233                         Fatal("Tried to add a QuadTree child of invalid type!");
 234         }
 235         return new_index;
 236 }
 237
 238 #endif
 239
 240 void Document::Load(const string & filename)
 241 {
 242         m_objects.bounds.clear();
 243         m_count = 0;
 244         if (filename == "")
 245         {
 246                 Debug("Loaded empty document.");
 247                 return;
 248         }
 249         Debug("Loading document from file \"%s\"", filename.c_str());
 250         FILE * file = fopen(filename.c_str(), "r");
 251         if (file == NULL)
 252                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 253
 254         size_t read;
 255
 256         DocChunkTypes chunk_type;
 257         uint32_t chunk_size;
 258         while (ReadChunkHeader(file, chunk_type, chunk_size))
 259         {
 260                 switch(chunk_type)
 261                 {
 262                 case CT_NUMOBJS:
 263                         read = fread(&m_count, sizeof(m_count), 1, file);
 264                         if (read != 1)
 265                                 Fatal("Failed to read number of objects!");
 266                         Debug("Number of objects: %u", ObjectCount());
 267                         break;
 268                 case CT_OBJTYPES:
 269                         Debug("Object types...");
 270                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 271                         break;
 272                 case CT_OBJBOUNDS:
 273                         Debug("Object bounds...");
 274                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 275                         break;
 276                 case CT_OBJINDICES:
 277                         Debug("Object data indices...");
 278                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 279                         break;
 280                 case CT_OBJBEZIERS:
 281                         Debug("Bezier data...");
 282                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 283                         break;
 284
 285                 case CT_OBJPATHS:
 286                         Debug("Path data...");
 287                         Warn("Not handled because lazy");
 288                         break;
 289                 }
 290         }
 291         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 292 #ifndef QUADTREE_DISABLED
 293         if (m_quadtree.root_id == QUADTREE_EMPTY)
 294         {
 295                 GenBaseQuadtree();
 296         }
 297 #endif
 298 }
 299
 300 unsigned Document::AddPath(unsigned start_index, unsigned end_index, const Colour & fill, const Colour & stroke)
 301 {
 302         Path path(m_objects, start_index, end_index, fill, stroke);
 303         unsigned data_index = AddPathData(path);
 304         Rect bounds = path.SolveBounds(m_objects);
 305         unsigned result = Add(PATH, bounds,data_index);
 306         //Debug("Added path %u -> %u (%u objects) colour {%u,%u,%u,%u}, stroke {%u,%u,%u,%u}", start_index, end_index, (end_index - start_index), fill.r, fill.g, fill.b, fill.a, stroke.r, stroke.g, stroke.b, stroke.a);
 307         return result;
 308 }
 309
 310 /**
 311  * Add a Bezier using Absolute coords
 312  */
 313 unsigned Document::AddBezier(const Bezier & bezier)
 314 {
 315         Rect bounds = bezier.SolveBounds();
 316         Bezier data = bezier.ToRelative(bounds); // Relative
 317         if (data.ToAbsolute(bounds) != bezier)
 318         {
 319                 Warn("%s != %s", data.ToAbsolute(Rect(0,0,1,1)).Str().c_str(),
 320                         bezier.Str().c_str());
 321                 Warn("ToAbsolute on ToRelative does not give original Bezier");
 322         }
 323         unsigned index = AddBezierData(data);
 324         return Add(BEZIER, bounds, index);
 325 }
 326
 327 unsigned Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 328 {
 329         m_objects.types.push_back(type);
 330         m_objects.bounds.push_back(bounds);
 331         m_objects.data_indices.push_back(data_index);
 332         return (m_count++); // Why can't we just use the size of types or something?
 333 }
 334
 335 unsigned Document::AddBezierData(const Bezier & bezier)
 336 {
 337         m_objects.beziers.push_back(bezier);
 338         return m_objects.beziers.size()-1;
 339 }
 340
 341 unsigned Document::AddPathData(const Path & path)
 342 {
 343         m_objects.paths.push_back(path);
 344         return m_objects.paths.size()-1;
 345 }
 346
 347 void Document::DebugDumpObjects()
 348 {
 349         Debug("Objects for Document %p are:", this);
 350         for (unsigned id = 0; id < ObjectCount(); ++id)
 351         {
 352                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 353         }
 354 }
 355
 356 bool Document::operator==(const Document & equ) const
 357 {
 358         return (ObjectCount() == equ.ObjectCount()
 359                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 360                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 361                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 362 }
 363
 364
 365
 366 // Behold my amazing tokenizing abilities
 367 static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
 368 {
 369         token.clear();
 370         while (i < d.size() && iswspace(d[i]))
 371         {
 372                 ++i;
 373         }
 374
 375         while (i < d.size())
 376         {
 377                 if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
 378                 {
 379                         if (token.size() == 0 && !iswspace(d[i]))
 380                         {
 381                                 token += d[i++];
 382                         }
 383                         break;
 384                 }
 385                 token += d[i++];
 386         }
 387         //Debug("Got token \"%s\"", token.c_str());
 388         return token;
 389 }
 390
 391 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
 392 {
 393         string token("");
 394         while (GetToken(d, token, i, delims) == ",");
 395         x = strtod(token.c_str(),NULL);
 396         if (GetToken(d, token, i, delims) != ",")
 397         {
 398                 Fatal("Expected \",\" seperating x,y pair");
 399         }
 400         y = strtod(GetToken(d, token, i, delims).c_str(),NULL);
 401 }
 402
 403 static bool GetKeyValuePair(const string & d, string & key, string & value, unsigned & i, const string & delims = "()[],{}<>;:=")
 404 {
 405         key = "";
 406         string token;
 407         while (GetToken(d, token, i, delims) == ":" || token == ";");
 408         key = token;
 409         if (GetToken(d, token, i, delims) != ":")
 410         {
 411                 Error("Expected \":\" seperating key:value pair");
 412                 return false;
 413         }
 414         value = "";
 415         GetToken(d, value, i, delims);
 416         return true;
 417 }
 418
 419 static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
 420 {
 421         Real x0(x);
 422         x = transform.a * x + transform.c * y + transform.e;
 423         y = transform.b * x0 + transform.d * y + transform.f;
 424 }
 425
 426 void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
 427 {
 428         //Debug("Parsing transform %s", s.c_str());
 429         string token;
 430         string command;
 431         unsigned i = 0;
 432
 433         while (i < s.size())
 434         {
 435                 GetToken(s, command, i);
 436                 if (command == "," || command == "" || command == ":")
 437                 {
 438                         if (i < s.size())
 439                                 GetToken(s, command, i);
 440                         else
 441                                 return;
 442                 }
 443                 //Debug("Token is \"%s\"", command.c_str());
 444
 445                 SVGMatrix delta = {1,0,0,0,1,0};
 446
 447
 448                 assert(GetToken(s,token, i) == "(");
 449                 if (command == "translate")
 450                 {
 451                         GetXYPair(s, delta.e, delta.f, i);
 452                         assert(GetToken(s,token, i) == ")");
 453                 }
 454                 else if (command == "matrix")
 455                 {
 456                         GetXYPair(s, delta.a, delta.b,i);
 457                         GetXYPair(s, delta.c, delta.d,i);
 458                         GetXYPair(s, delta.e, delta.f,i);
 459                         assert(GetToken(s,token, i) == ")");
 460                 }
 461                 else if (command == "scale")
 462                 {
 463                         delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
 464                         GetToken(s, token, i);
 465                         if (token == ",")
 466                         {
 467                                 delta.d = (strtod(GetToken(s,token,i).c_str(), NULL));
 468                                 assert(GetToken(s, token, i) == ")");
 469                         }
 470                         else
 471                         {
 472                                 delta.d = delta.a;
 473                                 assert(token == ")");
 474                         }
 475
 476                 }
 477                 else
 478                 {
 479                         Warn("Unrecognised transform \"%s\", using identity", command.c_str());
 480                 }
 481
 482                 //Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 483                 //Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
 484
 485                 SVGMatrix old(transform);
 486                 transform.a = old.a * delta.a + old.c * delta.b;
 487                 transform.c = old.a * delta.c + old.c * delta.d;
 488                 transform.e = old.a * delta.e + old.c * delta.f + old.e;
 489
 490                 transform.b = old.b * delta.a + old.d * delta.b;
 491                 transform.d = old.b * delta.c + old.d * delta.d;
 492                 transform.f = old.b * delta.e + old.d * delta.f + old.f;
 493
 494                 //Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 495         }
 496 }
 497
 498 inline Colour ParseColourString(const string & colour_str)
 499 {
 500         Colour c(0,0,0,0);
 501         if (colour_str == "red")
 502                 c = {255,0,0,255};
 503         else if (colour_str == "blue")
 504                 c = {0,0,255,255};
 505         else if (colour_str == "green")
 506                 c = {0,255,0,255};
 507         else if (colour_str == "black")
 508                 c = {0,0,0,255};
 509         else if (colour_str == "white")
 510                 c = {255,255,255,255};
 511         else if (colour_str.size() == 7 && colour_str[0] == '#')
 512         {
 513                 Debug("Parse colour string: \"%s\"", colour_str.c_str());
 514                 char comp[3] = {colour_str[1], colour_str[2], '\0'};
 515                 c.r = strtoul(comp, NULL, 16);
 516                 comp[0] = colour_str[3]; comp[1] = colour_str[4];
 517                 c.g = strtoul(comp, NULL, 16);
 518                 comp[0] = colour_str[5]; comp[1] = colour_str[6];
 519                 c.b = strtoul(comp, NULL, 16);
 520                 c.a = 255;
 521                 Debug("Colour is: %u, %u, %u, %u", c.r, c.g, c.b, c.a);
 522         }
 523         return c;
 524 }
 525
 526 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
 527 {
 528         //Debug("Parse node <%s>", root.name());
 529
 530
 531         for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
 532         {
 533                 SVGMatrix transform(parent_transform);
 534                 pugi::xml_attribute attrib_trans = child.attribute("transform");
 535                 if (!attrib_trans.empty())
 536                 {
 537                         ParseSVGTransform(attrib_trans.as_string(), transform);
 538                 }
 539
 540
 541
 542                 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
 543                         || strcmp(child.name(), "group") == 0)
 544                 {
 545
 546                         ParseSVGNode(child, transform);
 547                         continue;
 548                 }
 549                 else if (strcmp(child.name(), "path") == 0)
 550                 {
 551                         string d = child.attribute("d").as_string();
 552                         //Debug("Path data attribute is \"%s\"", d.c_str());
 553                         bool closed = false;
 554                         pair<unsigned, unsigned> range = ParseSVGPathData(d, transform, closed);
 555                         if (true)//(closed)
 556                         {
 557
 558                                 string colour_str("");
 559                                 map<string, string> style;
 560                                 if (child.attribute("style"))
 561                                 {
 562                                         ParseSVGStyleData(child.attribute("style").as_string(), style);
 563                                 }
 564
 565                                 // Determine shading colour
 566                                 if (child.attribute("fill"))
 567                                 {
 568                                         colour_str = child.attribute("fill").as_string();
 569                                 }
 570                                 else if (style.find("fill") != style.end())
 571                                 {
 572                                         colour_str = style["fill"];
 573                                 }
 574                                 Colour fill = ParseColourString(colour_str);
 575                                 Colour stroke = fill;
 576
 577                                 if (child.attribute("stroke"))
 578                                 {
 579                                         colour_str = child.attribute("stroke").as_string();
 580                                         stroke = ParseColourString(colour_str);
 581                                 }
 582                                 else if (style.find("stroke") != style.end())
 583                                 {
 584                                         colour_str = style["stroke"];
 585                                         stroke = ParseColourString(colour_str);
 586                                 }
 587
 588
 589                                 // Determin shading alpha
 590                                 if (child.attribute("fill-opacity"))
 591                                 {
 592                                         fill.a = 255*child.attribute("fill-opacity").as_float();
 593                                 }
 594                                 else if (style.find("fill-opacity") != style.end())
 595                                 {
 596                                         fill.a = 255*strtod(style["fill-opacity"].c_str(), NULL);
 597                                 }
 598                                 if (child.attribute("stroke-opacity"))
 599                                 {
 600                                         stroke.a = 255*child.attribute("stroke-opacity").as_float();
 601                                 }
 602                                 else if (style.find("stroke-opacity") != style.end())
 603                                 {
 604                                         stroke.a = 255*strtod(style["stroke-opacity"].c_str(), NULL);
 605                                 }
 606                                 AddPath(range.first, range.second, fill, stroke);
 607                         }
 608
 609                 }
 610                 else if (strcmp(child.name(), "line") == 0)
 611                 {
 612                         Real x0(child.attribute("x1").as_float());
 613                         Real y0(child.attribute("y1").as_float());
 614                         Real x1(child.attribute("x2").as_float());
 615                         Real y1(child.attribute("y2").as_float());
 616                         TransformXYPair(x0,y0,transform);
 617                         TransformXYPair(x1,y1,transform);
 618                         AddBezier(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
 619                 }
 620                 else if (strcmp(child.name(), "rect") == 0)
 621                 {
 622                         Real coords[4];
 623                         const char * attrib_names[] = {"x", "y", "width", "height"};
 624                         for (size_t i = 0; i < 4; ++i)
 625                                 coords[i] = child.attribute(attrib_names[i]).as_float();
 626
 627                         Real x2(coords[0]+coords[2]);
 628                         Real y2(coords[1]+coords[3]);
 629                         TransformXYPair(coords[0],coords[1],transform); // x, y, transform
 630                         TransformXYPair(x2,y2,transform);
 631                         coords[2] = x2 - coords[0];
 632                         coords[3] = y2 - coords[1];
 633
 634                         bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
 635                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
 636                 }
 637                 else if (strcmp(child.name(), "circle") == 0)
 638                 {
 639                         Real cx = child.attribute("cx").as_float();
 640                         Real cy = child.attribute("cy").as_float();
 641                         Real r = child.attribute("r").as_float();
 642
 643                         Real x = (cx - r);
 644                         Real y = (cy - r);
 645                         TransformXYPair(x,y,transform);
 646                         Real w = Real(2)*r*transform.a; // width scales
 647                         Real h = Real(2)*r*transform.d; // height scales
 648
 649
 650                         Rect rect(x,y,w,h);
 651                         Add(CIRCLE_FILLED, rect,0);
 652                         Debug("Added Circle %s", rect.Str().c_str());
 653                 }
 654                 else if (strcmp(child.name(), "text") == 0)
 655                 {
 656                         Real x = child.attribute("x").as_float();
 657                         Real y = child.attribute("y").as_float();
 658                         TransformXYPair(x,y,transform);
 659                         Debug("Add text \"%s\"", child.child_value());
 660                         AddText(child.child_value(), 0.05, x, y);
 661                 }
 662         }
 663 }
 664
 665 void Document::ParseSVGStyleData(const string & style, map<string, string> & results)
 666 {
 667         unsigned i = 0;
 668         string key;
 669         string value;
 670         while (i < style.size() && GetKeyValuePair(style, key, value, i))
 671         {
 672                 results[key] = value;
 673         }
 674 }
 675
 676 /**
 677  * Parse an SVG string into a rectangle
 678  */
 679 void Document::ParseSVG(const string & input, const Rect & bounds)
 680 {
 681         using namespace pugi;
 682
 683         xml_document doc_xml;
 684         xml_parse_result result = doc_xml.load(input.c_str());
 685
 686         if (!result)
 687                 Error("Couldn't parse SVG input - %s", result.description());
 688
 689         Debug("Loaded XML - %s", result.description());
 690         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 691         ParseSVGNode(doc_xml, transform);
 692 }
 693
 694 /**
 695  * Load an SVG into a rectangle
 696  */
 697 void Document::LoadSVG(const string & filename, const Rect & bounds)
 698 {
 699         using namespace pugi;
 700
 701         xml_document doc_xml;
 702         ifstream input(filename.c_str(), ios_base::in);
 703         xml_parse_result result = doc_xml.load(input);
 704
 705         if (!result)
 706                 Error("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 707
 708         Debug("Loaded XML - %s", result.description());
 709
 710         input.close();
 711                                                 // a c e, b d f
 712         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 713         ParseSVGNode(doc_xml, transform);
 714 }
 715
 716
 717
 718 // Fear the wrath of the tokenizing svg data
 719 // Seriously this isn't really very DOM-like at all is it?
 720 pair<unsigned, unsigned> Document::ParseSVGPathData(const string & d, const SVGMatrix & transform, bool & closed)
 721 {
 722         closed = false;
 723         Real x[4] = {0,0,0,0};
 724         Real y[4] = {0,0,0,0};
 725
 726         string token("");
 727         string command("m");
 728
 729         Real x0(0);
 730         Real y0(0);
 731
 732         unsigned i = 0;
 733         unsigned prev_i = 0;
 734
 735         bool start = false;
 736
 737
 738         static string delims("()[],{}<>;:=LlHhVvmMqQzZcC");
 739
 740         pair<unsigned, unsigned> range(m_count, m_count);
 741
 742         while (i < d.size() && GetToken(d, token, i, delims).size() > 0)
 743         {
 744                 if (isalpha(token[0]))
 745                         command = token;
 746                 else
 747                 {
 748                         i = prev_i; // hax
 749                         if(command == "")
 750                                 command = "L";
 751                 }
 752
 753                 bool relative = islower(command[0]);
 754
 755                 if (command == "m" || command == "M")
 756                 {
 757                         //Debug("Construct moveto command");
 758                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 759                         assert(GetToken(d,token,i,delims) == ",");
 760                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 761
 762                         x[0] = (relative) ? x[0] + dx : dx;
 763                         y[0] = (relative) ? y[0] + dy : dy;
 764
 765                         x0 = x[0];
 766                         y0 = y[0];
 767                         //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 768                         command = (command == "m") ? "l" : "L";
 769                 }
 770                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 771                 {
 772                         //Debug("Construct curveto command");
 773                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 774                         assert(GetToken(d,token,i,delims) == ",");
 775                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 776
 777                         x[1] = (relative) ? x[0] + dx : dx;
 778                         y[1] = (relative) ? y[0] + dy : dy;
 779
 780                         dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 781                         assert(GetToken(d,token,i,delims) == ",");
 782                         dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 783
 784                         x[2] = (relative) ? x[0] + dx : dx;
 785                         y[2] = (relative) ? y[0] + dy : dy;
 786
 787                         if (command != "q" && command != "Q")
 788                         {
 789                                 dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 790                                 assert(GetToken(d,token,i,delims) == ",");
 791                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 792                                 x[3] = (relative) ? x[0] + dx : dx;
 793                                 y[3] = (relative) ? y[0] + dy : dy;
 794                         }
 795                         else
 796                         {
 797                                 x[3] = x[2];
 798                                 y[3] = y[2];
 799                                 Real old_x1(x[1]), old_y1(y[1]);
 800                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 801                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 802                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 803                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 804                         }
 805
 806                         Real x3(x[3]);
 807                         Real y3(y[3]);
 808                         for (int j = 0; j < 4; ++j)
 809                                 TransformXYPair(x[j],y[j], transform);
 810
 811                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 812
 813                         //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]));
 814
 815                         x[0] = x3;
 816                         y[0] = y3;
 817
 818
 819                 }
 820                 else if (command == "l" || command == "L" || command == "h" || command == "H" || command == "v" || command == "V")
 821                 {
 822                         //Debug("Construct lineto command, relative %d", relative);
 823
 824                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 825                         Real dy;
 826                         if (command == "l" || command == "L")
 827                         {
 828                                 assert(GetToken(d,token,i,delims) == ",");
 829                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 830                         }
 831                         else if (command == "v" || command == "V")
 832                         {
 833                                 swap(dx,dy);
 834                         }
 835
 836                         x[1] = (relative) ? x[0] + dx : dx;
 837                         y[1] = (relative) ? y[0] + dy : dy;
 838                         if (command == "v" || command == "V")
 839                         {
 840                                 x[1] = x[0];
 841                         }
 842                         else if (command == "h" || command == "H")
 843                         {
 844                                 y[1] = y[0];
 845                         }
 846
 847                         Real x1(x[1]);
 848                         Real y1(y[1]);
 849
 850                         TransformXYPair(x[0],y[0],transform);
 851                         TransformXYPair(x[1],y[1],transform);
 852
 853
 854                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
 855
 856                         //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 857
 858                         x[0] = x1;
 859                         y[0] = y1;
 860
 861                 }
 862                 else if (command == "z" || command == "Z")
 863                 {
 864                         //Debug("Construct returnto command");
 865                         x[1] = x0;
 866                         y[1] = y0;
 867                         x[2] = x0;
 868                         y[2] = y0;
 869                         x[3] = x0;
 870                         y[3] = y0;
 871
 872                         Real x3(x[3]);
 873                         Real y3(y[3]);
 874                         for (int j = 0; j < 4; ++j)
 875                                 TransformXYPair(x[j],y[j], transform);
 876
 877                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 878                         //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 879
 880                         x[0] = x3;
 881                         y[0] = y3;
 882                         command = "m";
 883                         closed = true;
 884                 }
 885                 else
 886                 {
 887                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 888                         command = "m";
 889                 }
 890
 891                 if (!start)
 892                 {
 893                         x0 = x[0];
 894                         y0 = y[0];
 895                         start = true;
 896                 }
 897                 prev_i = i;
 898         }
 899         return range;
 900 }
 901
 902 void Document::SetFont(const string & font_filename)
 903 {
 904         if (m_font_data != NULL)
 905         {
 906                 free(m_font_data);
 907         }
 908
 909         FILE *font_file = fopen(font_filename.c_str(), "rb");
 910         fseek(font_file, 0, SEEK_END);
 911         size_t font_file_size = ftell(font_file);
 912         fseek(font_file, 0, SEEK_SET);
 913         m_font_data = (unsigned char*)malloc(font_file_size);
 914         size_t read = fread(m_font_data, 1, font_file_size, font_file);
 915         if (read != font_file_size)
 916         {
 917                 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
 918         }
 919         fclose(font_file);
 920         stbtt_InitFont(&m_font, m_font_data, 0);
 921 }
 922
 923 void Document::AddText(const string & text, Real scale, Real x, Real y)
 924 {
 925         if (m_font_data == NULL)
 926         {
 927                 Warn("No font loaded");
 928                 return;
 929         }
 930
 931         Real x0(x);
 932         //Real y0(y);
 933         int ascent = 0, descent = 0, line_gap = 0;
 934         stbtt_GetFontVMetrics(&m_font, &ascent, &descent, &line_gap);
 935         Real font_scale = scale;
 936         font_scale /= Real(ascent - descent);
 937         Real y_advance = Real(font_scale) * Real(ascent - descent + line_gap);
 938         for (unsigned i = 0; i < text.size(); ++i)
 939         {
 940                 if (text[i] == '\n')
 941                 {
 942                         y += y_advance;
 943                         x = x0;
 944                 }
 945                 if (!isprint(text[i]))
 946                         continue;
 947
 948                 int advance_width = 0, left_side_bearing = 0, kerning = 0;
 949                 stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
 950                 if (i >= 1)
 951                 {
 952                         kerning = stbtt_GetCodepointKernAdvance(&m_font, text[i-1], text[i]);
 953                 }
 954                 x += font_scale * Real(kerning);
 955                 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
 956                 x += font_scale * Real(advance_width);
 957         }
 958 }
 959
 960 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 961 {
 962         int glyph_index = stbtt_FindGlyphIndex(font, character);
 963
 964         // Check if there is actully a glyph to render.
 965         if (stbtt_IsGlyphEmpty(font, glyph_index))
 966         {
 967                 return;
 968         }
 969
 970         stbtt_vertex *instructions;
 971         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 972
 973         Real current_x(0), current_y(0);
 974         unsigned start_index = m_count;
 975         unsigned end_index = m_count;
 976         for (int i = 0; i < num_instructions; ++i)
 977         {
 978                 // TTF uses 16-bit signed ints for coordinates:
 979                 // with the y-axis inverted compared to us.
 980                 // Convert and scale any data.
 981                 Real inst_x = Real(instructions[i].x)*scale;
 982                 Real inst_y = Real(instructions[i].y)*-scale;
 983                 Real inst_cx = Real(instructions[i].cx)*scale;
 984                 Real inst_cy = Real(instructions[i].cy)*-scale;
 985                 Real old_x(current_x), old_y(current_y);
 986                 current_x = inst_x;
 987                 current_y = inst_y;
 988
 989                 switch(instructions[i].type)
 990                 {
 991                 // Move To
 992                 case STBTT_vmove:
 993                         break;
 994                 // Line To
 995                 case STBTT_vline:
 996                         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));
 997                         break;
 998                 // Quadratic Bezier To:
 999                 case STBTT_vcurve:
1000                         // Quadratic -> Cubic:
1001                         // - Endpoints are the same.
1002                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
1003                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
1004                         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,
1005                                                 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));
1006                         break;
1007                 }
1008         }
1009
1010         if (start_index < m_count && end_index < m_count)
1011         {
1012                 AddPath(start_index, end_index);
1013         }
1014         //Debug("Added Glyph \"%c\" at %f %f, scale %f", (char)character, Float(x), Float(y), Float(scale));
1015
1016         stbtt_FreeShape(font, instructions);
1017 }