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(), -1});
  98         m_quadtree.root_id = 0;
  99 }
 100
 101 int Document::ClipObjectToQuadChild(int object_id, QuadTreeNodeChildren type)
 102 {
 103         switch (m_objects.types[object_id])
 104         {
 105         case RECT_FILLED:
 106         case RECT_OUTLINE:
 107         case PATH:
 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                 // If we're entirely within the quadtree node, no clipping need occur.
 136                 if (ContainedInQuadChild(m_objects.bounds[object_id], type))
 137                 {
 138                         m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 139                         m_objects.types.push_back(m_objects.types[object_id]);
 140                         m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 141                         return 1;
 142                 }
 143                 Rect clip_bezier_bounds = TransformRectCoordinates(m_objects.bounds[object_id], TransformFromQuadChild(Rect{0,0,1,1}, type));
 144                 std::vector<Bezier> new_curves = m_objects.beziers[m_objects.data_indices[object_id]].ClipToRectangle(clip_bezier_bounds);
 145                 for (size_t i = 0; i < new_curves.size(); ++i)
 146                 {
 147                         Rect new_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 148                         Bezier new_curve_data = new_curves[i].ToAbsolute(TransformToQuadChild(m_objects.bounds[object_id],type));
 149                         new_bounds = new_curve_data.SolveBounds();
 150                         Debug("New bounds: %s", new_bounds.Str().c_str());
 151                         new_curve_data = new_curve_data.ToRelative(new_bounds);
 152                         unsigned index = AddBezierData(new_curve_data);
 153                         m_objects.bounds.push_back(new_bounds);
 154                         m_objects.types.push_back(BEZIER);
 155                         m_objects.data_indices.push_back(index);
 156                 }
 157                 return new_curves.size();
 158                 }
 159         default:
 160                 Debug("Adding %s -> %s", m_objects.bounds[object_id].Str().c_str(), TransformToQuadChild(m_objects.bounds[object_id], type).Str().c_str());
 161                 m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 162                 m_objects.types.push_back(m_objects.types[object_id]);
 163                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 164                 return 1;
 165         }
 166         return 0;
 167 }
 168 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 169 {
 170         QuadTreeIndex new_index = m_quadtree.nodes.size();
 171         Debug("-------------- Generating Quadtree Node %d (parent %d) ----------------------", new_index, parent);
 172         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0, -1});
 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, -1});
 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(bounds).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, QuadTreeIndex qti)
 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 #ifndef QUADTREE_DISABLED
 333         if (qti != -1)
 334         {
 335                 if (m_count == m_quadtree.nodes[qti].object_end+1)
 336                 {
 337                         m_quadtree.nodes[qti].object_end++;
 338                 }
 339                 else
 340                 {
 341                         QuadTreeIndex overlay = m_quadtree.nodes.size();
 342                         m_quadtree.nodes.push_back(m_quadtree.nodes[qti]);
 343                         m_quadtree.nodes[overlay].object_begin = m_count;
 344                         m_quadtree.nodes[overlay].object_end = m_count+1;
 345                         m_quadtree.nodes[qti].next_overlay = overlay;
 346                 }
 347         }
 348 #endif
 349         return (m_count++); // Why can't we just use the size of types or something?
 350 }
 351
 352 unsigned Document::AddBezierData(const Bezier & bezier)
 353 {
 354         m_objects.beziers.push_back(bezier);
 355         return m_objects.beziers.size()-1;
 356 }
 357
 358 unsigned Document::AddPathData(const Path & path)
 359 {
 360         m_objects.paths.push_back(path);
 361         return m_objects.paths.size()-1;
 362 }
 363
 364 void Document::DebugDumpObjects()
 365 {
 366         Debug("Objects for Document %p are:", this);
 367         for (unsigned id = 0; id < ObjectCount(); ++id)
 368         {
 369                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 370         }
 371 }
 372
 373 bool Document::operator==(const Document & equ) const
 374 {
 375         return (ObjectCount() == equ.ObjectCount()
 376                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 377                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 378                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 379 }
 380
 381
 382
 383 // Behold my amazing tokenizing abilities
 384 static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
 385 {
 386         token.clear();
 387         while (i < d.size() && iswspace(d[i]))
 388         {
 389                 ++i;
 390         }
 391
 392         while (i < d.size())
 393         {
 394                 if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
 395                 {
 396                         if (token.size() == 0 && !iswspace(d[i]))
 397                         {
 398                                 token += d[i++];
 399                         }
 400                         break;
 401                 }
 402                 token += d[i++];
 403         }
 404         //Debug("Got token \"%s\"", token.c_str());
 405         return token;
 406 }
 407
 408 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
 409 {
 410         string token("");
 411         while (GetToken(d, token, i, delims) == ",");
 412         x = RealFromStr(token);
 413         if (GetToken(d, token, i, delims) != ",")
 414         {
 415                 Fatal("Expected \",\" seperating x,y pair");
 416         }
 417         y = RealFromStr(GetToken(d,token,i,delims));
 418 }
 419
 420 static bool GetKeyValuePair(const string & d, string & key, string & value, unsigned & i, const string & delims = "()[],{}<>;:=")
 421 {
 422         key = "";
 423         string token;
 424         while (GetToken(d, token, i, delims) == ":" || token == ";");
 425         key = token;
 426         if (GetToken(d, token, i, delims) != ":")
 427         {
 428                 Error("Expected \":\" seperating key:value pair");
 429                 return false;
 430         }
 431         value = "";
 432         GetToken(d, value, i, delims);
 433         return true;
 434 }
 435
 436 static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
 437 {
 438         Real x0(x);
 439         x = transform.a * x + transform.c * y + transform.e;
 440         y = transform.b * x0 + transform.d * y + transform.f;
 441 }
 442
 443 void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
 444 {
 445         //Debug("Parsing transform %s", s.c_str());
 446         string token;
 447         string command;
 448         unsigned i = 0;
 449
 450         while (i < s.size())
 451         {
 452                 GetToken(s, command, i);
 453                 if (command == "," || command == "" || command == ":")
 454                 {
 455                         if (i < s.size())
 456                                 GetToken(s, command, i);
 457                         else
 458                                 return;
 459                 }
 460                 //Debug("Token is \"%s\"", command.c_str());
 461
 462                 SVGMatrix delta = {1,0,0,0,1,0};
 463
 464
 465                 assert(GetToken(s,token, i) == "(");
 466                 if (command == "translate")
 467                 {
 468                         GetXYPair(s, delta.e, delta.f, i);
 469                         assert(GetToken(s,token, i) == ")");
 470                 }
 471                 else if (command == "matrix")
 472                 {
 473                         GetXYPair(s, delta.a, delta.b,i);
 474                         GetXYPair(s, delta.c, delta.d,i);
 475                         GetXYPair(s, delta.e, delta.f,i);
 476                         assert(GetToken(s,token, i) == ")");
 477                 }
 478                 else if (command == "scale")
 479                 {
 480                         delta.a = RealFromStr(GetToken(s,token,i));
 481                         GetToken(s, token, i);
 482                         if (token == ",")
 483                         {
 484                                 delta.d = RealFromStr(GetToken(s,token,i));
 485                                 assert(GetToken(s, token, i) == ")");
 486                         }
 487                         else
 488                         {
 489                                 delta.d = delta.a;
 490                                 assert(token == ")");
 491                         }
 492
 493                 }
 494                 else
 495                 {
 496                         Warn("Unrecognised transform \"%s\", using identity", command.c_str());
 497                 }
 498
 499                 //Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 500                 //Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
 501
 502                 SVGMatrix old(transform);
 503                 transform.a = old.a * delta.a + old.c * delta.b;
 504                 transform.c = old.a * delta.c + old.c * delta.d;
 505                 transform.e = old.a * delta.e + old.c * delta.f + old.e;
 506
 507                 transform.b = old.b * delta.a + old.d * delta.b;
 508                 transform.d = old.b * delta.c + old.d * delta.d;
 509                 transform.f = old.b * delta.e + old.d * delta.f + old.f;
 510
 511                 //Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 512         }
 513 }
 514
 515 inline Colour ParseColourString(const string & colour_str)
 516 {
 517         Colour c(0,0,0,0);
 518         if (colour_str == "red")
 519                 c = {255,0,0,255};
 520         else if (colour_str == "blue")
 521                 c = {0,0,255,255};
 522         else if (colour_str == "green")
 523                 c = {0,255,0,255};
 524         else if (colour_str == "black")
 525                 c = {0,0,0,255};
 526         else if (colour_str == "white")
 527                 c = {255,255,255,255};
 528         else if (colour_str.size() == 7 && colour_str[0] == '#')
 529         {
 530                 //Debug("Parse colour string: \"%s\"", colour_str.c_str());
 531                 char comp[3] = {colour_str[1], colour_str[2], '\0'};
 532                 c.r = strtoul(comp, NULL, 16);
 533                 comp[0] = colour_str[3]; comp[1] = colour_str[4];
 534                 c.g = strtoul(comp, NULL, 16);
 535                 comp[0] = colour_str[5]; comp[1] = colour_str[6];
 536                 c.b = strtoul(comp, NULL, 16);
 537                 c.a = 255;
 538                 //Debug("Colour is: %u, %u, %u, %u", c.r, c.g, c.b, c.a);
 539         }
 540         return c;
 541 }
 542
 543 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
 544 {
 545         //Debug("Parse node <%s>", root.name());
 546
 547
 548         // Centre the SVGs
 549         if (strcmp(root.name(),"svg") == 0)
 550         {
 551                 Real ww = RealFromStr(root.attribute("width").as_string());
 552                 Real hh = RealFromStr(root.attribute("height").as_string());
 553                 parent_transform.e -= parent_transform.a * ww/Real(2);
 554                 parent_transform.f -= parent_transform.d * hh/Real(2);
 555         }
 556
 557         for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
 558         {
 559                 SVGMatrix transform(parent_transform);
 560                 pugi::xml_attribute attrib_trans = child.attribute("transform");
 561                 if (!attrib_trans.empty())
 562                 {
 563                         ParseSVGTransform(attrib_trans.as_string(), transform);
 564                 }
 565
 566
 567
 568                 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
 569                         || strcmp(child.name(), "group") == 0)
 570                 {
 571
 572                         ParseSVGNode(child, transform);
 573                         continue;
 574                 }
 575                 else if (strcmp(child.name(), "path") == 0)
 576                 {
 577                         string d = child.attribute("d").as_string();
 578                         //Debug("Path data attribute is \"%s\"", d.c_str());
 579                         bool closed = false;
 580                         pair<unsigned, unsigned> range = ParseSVGPathData(d, transform, closed);
 581                         if (true && range.first < m_count && range.second < m_count)//(closed)
 582                         {
 583
 584                                 string colour_str("");
 585                                 map<string, string> style;
 586                                 if (child.attribute("style"))
 587                                 {
 588                                         ParseSVGStyleData(child.attribute("style").as_string(), style);
 589                                 }
 590
 591                                 // Determine shading colour
 592                                 if (child.attribute("fill"))
 593                                 {
 594                                         colour_str = child.attribute("fill").as_string();
 595                                 }
 596                                 else if (style.find("fill") != style.end())
 597                                 {
 598                                         colour_str = style["fill"];
 599                                 }
 600                                 Colour fill = ParseColourString(colour_str);
 601                                 Colour stroke = fill;
 602
 603                                 if (child.attribute("stroke"))
 604                                 {
 605                                         colour_str = child.attribute("stroke").as_string();
 606                                         stroke = ParseColourString(colour_str);
 607                                 }
 608                                 else if (style.find("stroke") != style.end())
 609                                 {
 610                                         colour_str = style["stroke"];
 611                                         stroke = ParseColourString(colour_str);
 612                                 }
 613
 614
 615                                 // Determin shading alpha
 616                                 if (child.attribute("fill-opacity"))
 617                                 {
 618                                         fill.a = 255*child.attribute("fill-opacity").as_float();
 619                                 }
 620                                 else if (style.find("fill-opacity") != style.end())
 621                                 {
 622                                         fill.a = 255*strtod(style["fill-opacity"].c_str(), NULL);
 623                                 }
 624                                 if (child.attribute("stroke-opacity"))
 625                                 {
 626                                         stroke.a = 255*child.attribute("stroke-opacity").as_float();
 627                                 }
 628                                 else if (style.find("stroke-opacity") != style.end())
 629                                 {
 630                                         stroke.a = 255*strtod(style["stroke-opacity"].c_str(), NULL);
 631                                 }
 632                                 AddPath(range.first, range.second, fill, stroke);
 633                         }
 634
 635                 }
 636                 else if (strcmp(child.name(), "line") == 0)
 637                 {
 638                         Real x0(child.attribute("x1").as_float());
 639                         Real y0(child.attribute("y1").as_float());
 640                         Real x1(child.attribute("x2").as_float());
 641                         Real y1(child.attribute("y2").as_float());
 642                         TransformXYPair(x0,y0,transform);
 643                         TransformXYPair(x1,y1,transform);
 644                         AddBezier(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
 645                 }
 646                 else if (strcmp(child.name(), "rect") == 0)
 647                 {
 648                         Real coords[4];
 649                         const char * attrib_names[] = {"x", "y", "width", "height"};
 650                         for (size_t i = 0; i < 4; ++i)
 651                                 coords[i] = child.attribute(attrib_names[i]).as_float();
 652
 653                         Real x2(coords[0]+coords[2]);
 654                         Real y2(coords[1]+coords[3]);
 655                         TransformXYPair(coords[0],coords[1],transform); // x, y, transform
 656                         TransformXYPair(x2,y2,transform);
 657                         coords[2] = x2 - coords[0];
 658                         coords[3] = y2 - coords[1];
 659
 660                         bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
 661                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
 662                 }
 663                 else if (strcmp(child.name(), "circle") == 0)
 664                 {
 665                         Real cx = child.attribute("cx").as_float();
 666                         Real cy = child.attribute("cy").as_float();
 667                         Real r = child.attribute("r").as_float();
 668
 669                         Real x = (cx - r);
 670                         Real y = (cy - r);
 671                         TransformXYPair(x,y,transform);
 672                         Real w = Real(2)*r*transform.a; // width scales
 673                         Real h = Real(2)*r*transform.d; // height scales
 674
 675
 676                         Rect rect(x,y,w,h);
 677                         Add(CIRCLE_FILLED, rect,0);
 678                         Debug("Added Circle %s", rect.Str().c_str());
 679                 }
 680                 else if (strcmp(child.name(), "text") == 0)
 681                 {
 682                         Real x = child.attribute("x").as_float();
 683                         Real y = child.attribute("y").as_float();
 684                         TransformXYPair(x,y,transform);
 685                         Debug("Add text \"%s\"", child.child_value());
 686                         AddText(child.child_value(), 0.05, x, y);
 687                 }
 688         }
 689 }
 690
 691 void Document::ParseSVGStyleData(const string & style, map<string, string> & results)
 692 {
 693         unsigned i = 0;
 694         string key;
 695         string value;
 696         while (i < style.size() && GetKeyValuePair(style, key, value, i))
 697         {
 698                 results[key] = value;
 699         }
 700 }
 701
 702 /**
 703  * Parse an SVG string into a rectangle
 704  */
 705 void Document::ParseSVG(const string & input, const Rect & bounds)
 706 {
 707         using namespace pugi;
 708
 709         xml_document doc_xml;
 710         xml_parse_result result = doc_xml.load(input.c_str());
 711
 712         if (!result)
 713                 Error("Couldn't parse SVG input - %s", result.description());
 714
 715         Debug("Loaded XML - %s", result.description());
 716         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 717         ParseSVGNode(doc_xml, transform);
 718 }
 719
 720 /**
 721  * Load an SVG into a rectangle
 722  */
 723 void Document::LoadSVG(const string & filename, const Rect & bounds)
 724 {
 725         using namespace pugi;
 726
 727         xml_document doc_xml;
 728         ifstream input(filename.c_str(), ios_base::in);
 729         xml_parse_result result = doc_xml.load(input);
 730
 731         if (!result)
 732                 Error("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 733
 734         Debug("Loaded XML - %s", result.description());
 735
 736         input.close();
 737                                                 // a c e, b d f
 738         SVGMatrix transform = {bounds.w,0 ,bounds.x, 0,bounds.h,bounds.y};
 739         ParseSVGNode(doc_xml, transform);
 740 }
 741
 742
 743
 744 // Fear the wrath of the tokenizing svg data
 745 // Seriously this isn't really very DOM-like at all is it?
 746 pair<unsigned, unsigned> Document::ParseSVGPathData(const string & d, const SVGMatrix & transform, bool & closed)
 747 {
 748         closed = false;
 749         Real x[4] = {0,0,0,0};
 750         Real y[4] = {0,0,0,0};
 751
 752         string token("");
 753         string command("m");
 754
 755         Real x0(0);
 756         Real y0(0);
 757
 758         unsigned i = 0;
 759         unsigned prev_i = 0;
 760
 761         bool start = false;
 762
 763
 764         static string delims("()[],{}<>;:=LlHhVvmMqQzZcC");
 765
 766         pair<unsigned, unsigned> range(m_count, m_count);
 767
 768         while (i < d.size() && GetToken(d, token, i, delims).size() > 0)
 769         {
 770                 if (isalpha(token[0]))
 771                         command = token;
 772                 else
 773                 {
 774                         i = prev_i; // hax
 775                         if(command == "")
 776                                 command = "L";
 777                 }
 778
 779                 bool relative = islower(command[0]);
 780
 781                 if (command == "m" || command == "M")
 782                 {
 783                         //Debug("Construct moveto command");
 784                         Real dx = RealFromStr(GetToken(d,token,i,delims));
 785                         assert(GetToken(d,token,i,delims) == ",");
 786                         Real dy = RealFromStr(GetToken(d,token,i,delims));
 787
 788                         x[0] = (relative) ? x[0] + dx : dx;
 789                         y[0] = (relative) ? y[0] + dy : dy;
 790
 791                         x0 = x[0];
 792                         y0 = y[0];
 793                         //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 794                         command = (command == "m") ? "l" : "L";
 795                 }
 796                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 797                 {
 798                         //Debug("Construct curveto command");
 799                         Real dx = RealFromStr(GetToken(d,token,i,delims));
 800                         assert(GetToken(d,token,i,delims) == ",");
 801                         Real dy = RealFromStr(GetToken(d,token,i,delims));
 802
 803                         x[1] = (relative) ? x[0] + dx : dx;
 804                         y[1] = (relative) ? y[0] + dy : dy;
 805
 806                         dx = RealFromStr(GetToken(d,token,i,delims));
 807                         assert(GetToken(d,token,i,delims) == ",");
 808                         dy = RealFromStr(GetToken(d,token,i,delims));
 809
 810                         x[2] = (relative) ? x[0] + dx : dx;
 811                         y[2] = (relative) ? y[0] + dy : dy;
 812
 813                         if (command != "q" && command != "Q")
 814                         {
 815                                 dx = RealFromStr(GetToken(d,token,i,delims));
 816                                 assert(GetToken(d,token,i,delims) == ",");
 817                                 dy = RealFromStr(GetToken(d,token,i,delims));
 818                                 x[3] = (relative) ? x[0] + dx : dx;
 819                                 y[3] = (relative) ? y[0] + dy : dy;
 820                         }
 821                         else
 822                         {
 823                                 x[3] = x[2];
 824                                 y[3] = y[2];
 825                                 Real old_x1(x[1]), old_y1(y[1]);
 826                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 827                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 828                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 829                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 830                         }
 831
 832                         Real x3(x[3]);
 833                         Real y3(y[3]);
 834                         for (int j = 0; j < 4; ++j)
 835                                 TransformXYPair(x[j],y[j], transform);
 836
 837                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 838
 839                         //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]));
 840
 841                         x[0] = x3;
 842                         y[0] = y3;
 843
 844
 845                 }
 846                 else if (command == "l" || command == "L" || command == "h" || command == "H" || command == "v" || command == "V")
 847                 {
 848                         //Debug("Construct lineto command, relative %d", relative);
 849
 850                         Real dx = RealFromStr(GetToken(d,token,i,delims));
 851                         Real dy = 0;
 852                         if (command == "l" || command == "L")
 853                         {
 854                                 assert(GetToken(d,token,i,delims) == ",");
 855                                 dy = RealFromStr(GetToken(d,token,i,delims));
 856                         }
 857                         else if (command == "v" || command == "V")
 858                         {
 859                                 swap(dx,dy);
 860                         }
 861
 862                         x[1] = (relative) ? x[0] + dx : dx;
 863                         y[1] = (relative) ? y[0] + dy : dy;
 864                         if (command == "v" || command == "V")
 865                         {
 866                                 x[1] = x[0];
 867                         }
 868                         else if (command == "h" || command == "H")
 869                         {
 870                                 y[1] = y[0];
 871                         }
 872
 873                         Real x1(x[1]);
 874                         Real y1(y[1]);
 875
 876                         TransformXYPair(x[0],y[0],transform);
 877                         TransformXYPair(x[1],y[1],transform);
 878
 879
 880                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
 881
 882                         //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 883
 884                         x[0] = x1;
 885                         y[0] = y1;
 886
 887                 }
 888                 else if (command == "z" || command == "Z")
 889                 {
 890                         //Debug("Construct returnto command");
 891                         x[1] = x0;
 892                         y[1] = y0;
 893                         x[2] = x0;
 894                         y[2] = y0;
 895                         x[3] = x0;
 896                         y[3] = y0;
 897
 898                         Real x3(x[3]);
 899                         Real y3(y[3]);
 900                         for (int j = 0; j < 4; ++j)
 901                                 TransformXYPair(x[j],y[j], transform);
 902
 903                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 904                         //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 905
 906                         x[0] = x3;
 907                         y[0] = y3;
 908                         command = "m";
 909                         closed = true;
 910                 }
 911                 else
 912                 {
 913                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 914                         command = "m";
 915                 }
 916
 917                 if (!start)
 918                 {
 919                         x0 = x[0];
 920                         y0 = y[0];
 921                         start = true;
 922                 }
 923                 prev_i = i;
 924         }
 925         return range;
 926 }
 927
 928 void Document::SetFont(const string & font_filename)
 929 {
 930         if (m_font_data != NULL)
 931         {
 932                 free(m_font_data);
 933         }
 934
 935         FILE *font_file = fopen(font_filename.c_str(), "rb");
 936         fseek(font_file, 0, SEEK_END);
 937         size_t font_file_size = ftell(font_file);
 938         fseek(font_file, 0, SEEK_SET);
 939         m_font_data = (unsigned char*)malloc(font_file_size);
 940         size_t read = fread(m_font_data, 1, font_file_size, font_file);
 941         if (read != font_file_size)
 942         {
 943                 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
 944         }
 945         fclose(font_file);
 946         stbtt_InitFont(&m_font, m_font_data, 0);
 947 }
 948
 949 void Document::AddText(const string & text, Real scale, Real x, Real y)
 950 {
 951         if (m_font_data == NULL)
 952         {
 953                 Warn("No font loaded");
 954                 return;
 955         }
 956
 957         Real x0(x);
 958         //Real y0(y);
 959         int ascent = 0, descent = 0, line_gap = 0;
 960         stbtt_GetFontVMetrics(&m_font, &ascent, &descent, &line_gap);
 961         Real font_scale = scale;
 962         font_scale /= Real(ascent - descent);
 963         Real y_advance = Real(font_scale) * Real(ascent - descent + line_gap);
 964         for (unsigned i = 0; i < text.size(); ++i)
 965         {
 966                 if (text[i] == '\n')
 967                 {
 968                         y += y_advance;
 969                         x = x0;
 970                 }
 971                 if (!isprint(text[i]))
 972                         continue;
 973
 974                 int advance_width = 0, left_side_bearing = 0, kerning = 0;
 975                 stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
 976                 if (i >= 1)
 977                 {
 978                         kerning = stbtt_GetCodepointKernAdvance(&m_font, text[i-1], text[i]);
 979                 }
 980                 x += font_scale * Real(kerning);
 981                 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
 982                 x += font_scale * Real(advance_width);
 983         }
 984 }
 985
 986 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 987 {
 988         int glyph_index = stbtt_FindGlyphIndex(font, character);
 989
 990         // Check if there is actully a glyph to render.
 991         if (stbtt_IsGlyphEmpty(font, glyph_index))
 992         {
 993                 return;
 994         }
 995
 996         stbtt_vertex *instructions;
 997         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 998
 999         Real current_x(0), current_y(0);
1000         unsigned start_index = m_count;
1001         unsigned end_index = m_count;
1002         for (int i = 0; i < num_instructions; ++i)
1003         {
1004                 // TTF uses 16-bit signed ints for coordinates:
1005                 // with the y-axis inverted compared to us.
1006                 // Convert and scale any data.
1007                 Real inst_x = Real(instructions[i].x)*scale;
1008                 Real inst_y = Real(instructions[i].y)*-scale;
1009                 Real inst_cx = Real(instructions[i].cx)*scale;
1010                 Real inst_cy = Real(instructions[i].cy)*-scale;
1011                 Real old_x(current_x), old_y(current_y);
1012                 current_x = inst_x;
1013                 current_y = inst_y;
1014
1015                 switch(instructions[i].type)
1016                 {
1017                 // Move To
1018                 case STBTT_vmove:
1019                         break;
1020                 // Line To
1021                 case STBTT_vline:
1022                         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));
1023                         break;
1024                 // Quadratic Bezier To:
1025                 case STBTT_vcurve:
1026                         // Quadratic -> Cubic:
1027                         // - Endpoints are the same.
1028                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
1029                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
1030                         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,
1031                                                 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));
1032                         break;
1033                 }
1034         }
1035
1036         if (start_index < m_count && end_index < m_count)
1037         {
1038                 AddPath(start_index, end_index);
1039         }
1040         //Debug("Added Glyph \"%c\" at %f %f, scale %f", (char)character, Float(x), Float(y), Float(scale));
1041
1042         stbtt_FreeShape(font, instructions);
1043 }
1044
1045 void Document::TransformObjectBounds(const SVGMatrix & transform)
1046 {
1047         for (unsigned i = 0; i < m_count; ++i)
1048         {
1049                 TransformXYPair(m_objects.bounds[i].x, m_objects.bounds[i].y, transform);
1050                 m_objects.bounds[i].w *= transform.a;
1051                 m_objects.bounds[i].h *= transform.d;
1052         }
1053 }
1054
1055 void Document::TranslateObjects(const Real & dx, const Real & dy)
1056 {
1057         for (unsigned i = 0; i < m_count; ++i)
1058         {
1059                 m_objects.bounds[i].x += dx;
1060                 m_objects.bounds[i].y += dy;
1061         }
1062 }
1063
1064 void Document::ScaleObjectsAboutPoint(const Real & x, const Real & y, const Real & scale_amount)
1065 {
1066         for (unsigned i = 0; i < m_count; ++i)
1067         {
1068                 m_objects.bounds[i].w /= scale_amount;
1069                 m_objects.bounds[i].h /= scale_amount;
1070                 //m_objects.bounds[i].x = x + (m_objects.bounds[i].x-x)/scale_amount;
1071                 //m_objects.bounds[i].y = y + (m_objects.bounds[i].y-x)/scale_amount;
1072                 m_objects.bounds[i].x -= x;
1073                 m_objects.bounds[i].x /= scale_amount;
1074                 m_objects.bounds[i].x += x;
1075
1076                 m_objects.bounds[i].y -= y;
1077                 m_objects.bounds[i].y /= scale_amount;
1078                 m_objects.bounds[i].y += y;
1079
1080         }
1081
1082 }