src/document.cpp

   1 #include "document.h"
   2 #include "bezier.h"
   3 #include <cstdio>
   4 #include <fstream>
   5
   6 #include "../contrib/pugixml-1.4/src/pugixml.cpp"
   7
   8 #include "stb_truetype.h"
   9
  10 using namespace IPDF;
  11 using namespace std;
  12
  13 //TODO: Make this work for variable sized Reals
  14
  15 // Loads an std::vector<T> of size num_elements from a file.
  16 template<typename T>
  17 static void LoadStructVector(FILE *src_file, size_t num_elems, std::vector<T>& dest)
  18 {
  19         size_t structsread = 0;
  20         dest.resize(num_elems);
  21         structsread = fread(dest.data(), sizeof(T), num_elems, src_file);
  22         if (structsread != num_elems)
  23                 Fatal("Only read %u structs (expected %u)!", structsread, num_elems);
  24 }
  25
  26 // Saves an std::vector<T> to a file. Size must be saves separately.
  27 template<typename T>
  28 static void SaveStructVector(FILE *dst_file, std::vector<T>& src)
  29 {
  30         size_t written = 0;
  31         written = fwrite(src.data(), sizeof(T), src.size(), dst_file);
  32         if (written != src.size())
  33                 Fatal("Only wrote %u structs (expected %u)!", written, src.size());
  34 }
  35
  36 static void WriteChunkHeader(FILE *dst_file, DocChunkTypes type, uint32_t size)
  37 {
  38         size_t written = 0;
  39         written = fwrite(&type, sizeof(type), 1, dst_file);
  40         if (written != 1)
  41                 Fatal("Could not write Chunk header! (ID)");
  42         written = fwrite(&size, sizeof(size), 1, dst_file);
  43         if (written != 1)
  44                 Fatal("Could not write Chunk header (size)!");
  45 }
  46
  47 static bool ReadChunkHeader(FILE *src_file, DocChunkTypes& type, uint32_t& size)
  48 {
  49         if (fread(&type, sizeof(DocChunkTypes), 1, src_file) != 1)
  50                 return false;
  51         if (fread(&size, sizeof(uint32_t), 1, src_file) != 1)
  52                 return false;
  53         return true;
  54 }
  55
  56 void Document::Save(const string & filename)
  57 {
  58         Debug("Saving document to file \"%s\"...", filename.c_str());
  59         FILE * file = fopen(filename.c_str(), "w");
  60         if (file == NULL)
  61                 Fatal("Couldn't open file \"%s\" - %s", filename.c_str(), strerror(errno));
  62
  63         size_t written;
  64         Debug("Number of objects (%u)...", ObjectCount());
  65         WriteChunkHeader(file, CT_NUMOBJS, sizeof(m_count));
  66         written = fwrite(&m_count, sizeof(m_count), 1, file);
  67         if (written != 1)
  68                 Fatal("Failed to write number of objects!");
  69
  70         Debug("Object types...");
  71         WriteChunkHeader(file, CT_OBJTYPES, m_objects.types.size() * sizeof(ObjectType));
  72         SaveStructVector<ObjectType>(file, m_objects.types);
  73
  74         Debug("Object bounds...");
  75         WriteChunkHeader(file, CT_OBJBOUNDS, m_objects.bounds.size() * sizeof(Rect));
  76         SaveStructVector<Rect>(file, m_objects.bounds);
  77
  78         Debug("Object data indices...");
  79         WriteChunkHeader(file, CT_OBJINDICES, m_objects.data_indices.size() * sizeof(unsigned));
  80         SaveStructVector<unsigned>(file, m_objects.data_indices);
  81
  82         Debug("Bezier data...");
  83         WriteChunkHeader(file, CT_OBJBEZIERS, m_objects.beziers.size() * sizeof(uint8_t));
  84         SaveStructVector<Bezier>(file, m_objects.beziers);
  85
  86         int err = fclose(file);
  87         if (err != 0)
  88                 Fatal("Failed to close file \"%s\" - %s", filename.c_str(), strerror(err));
  89
  90         Debug("Successfully saved %u objects to \"%s\"", ObjectCount(), filename.c_str());
  91 }
  92
  93 #ifndef QUADTREE_DISABLED
  94
  95 void Document::GenBaseQuadtree()
  96 {
  97         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QTC_UNKNOWN, 0, ObjectCount()});
  98         m_quadtree.root_id = 0;
  99         GenQuadChild(0, QTC_TOP_LEFT);
 100 }
 101
 102 int Document::ClipObjectToQuadChild(int object_id, QuadTreeNodeChildren type)
 103 {
 104         switch (m_objects.types[object_id])
 105         {
 106         case RECT_FILLED:
 107         case RECT_OUTLINE:
 108                 {
 109                 Rect obj_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 110                 if (obj_bounds.x < 0)
 111                 {
 112                         obj_bounds.w += obj_bounds.x;
 113                         obj_bounds.x = 0;
 114                 }
 115                 if (obj_bounds.y < 0)
 116                 {
 117                         obj_bounds.h += obj_bounds.y;
 118                         obj_bounds.y = 0;
 119                 }
 120                 if (obj_bounds.x + obj_bounds.w > 1)
 121                 {
 122                         obj_bounds.w += (1 - (obj_bounds.x + obj_bounds.w));
 123                 }
 124                 if (obj_bounds.y + obj_bounds.h > 1)
 125                 {
 126                         obj_bounds.h += (1 - (obj_bounds.y + obj_bounds.h));
 127                 }
 128                 m_objects.bounds.push_back(obj_bounds);
 129                 m_objects.types.push_back(m_objects.types[object_id]);
 130                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 131                 return 1;
 132                 }
 133         case BEZIER:
 134                 {
 135                 // 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                         new_curve_data = new_curve_data.ToRelative(new_bounds);
 151                         unsigned index = AddBezierData(new_curve_data);
 152                         m_objects.bounds.push_back(new_bounds);
 153                         m_objects.types.push_back(BEZIER);
 154                         m_objects.data_indices.push_back(index);
 155                 }
 156                 return new_curves.size();
 157                 }
 158         default:
 159                 Debug("Adding %s -> %s", m_objects.bounds[object_id].Str().c_str(), TransformToQuadChild(m_objects.bounds[object_id], type).Str().c_str());
 160                 m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 161                 m_objects.types.push_back(m_objects.types[object_id]);
 162                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 163                 return 1;
 164         }
 165         return 0;
 166 }
 167 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 168 {
 169         QuadTreeIndex new_index = m_quadtree.nodes.size();
 170         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 171
 172         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 173         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 174         {
 175                 if (IntersectsQuadChild(m_objects.bounds[i], type))
 176                 {
 177                         m_count += ClipObjectToQuadChild(i, type);
 178                 }
 179         }
 180         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 181         switch (type)
 182         {
 183                 case QTC_TOP_LEFT:
 184                         m_quadtree.nodes[parent].top_left = new_index;
 185                         break;
 186                 case QTC_TOP_RIGHT:
 187                         m_quadtree.nodes[parent].top_right = new_index;
 188                         break;
 189                 case QTC_BOTTOM_LEFT:
 190                         m_quadtree.nodes[parent].bottom_left = new_index;
 191                         break;
 192                 case QTC_BOTTOM_RIGHT:
 193                         m_quadtree.nodes[parent].bottom_right = new_index;
 194                         break;
 195                 default:
 196                         Fatal("Tried to add a QuadTree child of invalid type!");
 197         }
 198         return new_index;
 199 }
 200
 201 // Reparent a quadtree node, making it the "type" child of a new node.
 202 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 203 {
 204         QuadTreeIndex new_index = m_quadtree.nodes.size();
 205         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
 206
 207         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 208         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 209         {
 210                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 211                 m_objects.types.push_back(m_objects.types[i]);
 212                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 213                 m_count++;
 214         }
 215         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 216         switch (type)
 217         {
 218                 case QTC_TOP_LEFT:
 219                         m_quadtree.nodes[new_index].top_left = child;
 220                         break;
 221                 case QTC_TOP_RIGHT:
 222                         m_quadtree.nodes[new_index].top_right = child;
 223                         break;
 224                 case QTC_BOTTOM_LEFT:
 225                         m_quadtree.nodes[new_index].bottom_left = child;
 226                         break;
 227                 case QTC_BOTTOM_RIGHT:
 228                         m_quadtree.nodes[new_index].bottom_right = child;
 229                         break;
 230                 default:
 231                         Fatal("Tried to add a QuadTree child of invalid type!");
 232         }
 233         return new_index;
 234 }
 235
 236 #endif
 237
 238 void Document::Load(const string & filename)
 239 {
 240         m_objects.bounds.clear();
 241         m_count = 0;
 242         if (filename == "")
 243         {
 244                 Debug("Loaded empty document.");
 245                 return;
 246         }
 247         Debug("Loading document from file \"%s\"", filename.c_str());
 248         FILE * file = fopen(filename.c_str(), "r");
 249         if (file == NULL)
 250                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 251
 252         size_t read;
 253
 254         DocChunkTypes chunk_type;
 255         uint32_t chunk_size;
 256         while (ReadChunkHeader(file, chunk_type, chunk_size))
 257         {
 258                 switch(chunk_type)
 259                 {
 260                 case CT_NUMOBJS:
 261                         read = fread(&m_count, sizeof(m_count), 1, file);
 262                         if (read != 1)
 263                                 Fatal("Failed to read number of objects!");
 264                         Debug("Number of objects: %u", ObjectCount());
 265                         break;
 266                 case CT_OBJTYPES:
 267                         Debug("Object types...");
 268                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 269                         break;
 270                 case CT_OBJBOUNDS:
 271                         Debug("Object bounds...");
 272                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 273                         break;
 274                 case CT_OBJINDICES:
 275                         Debug("Object data indices...");
 276                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 277                         break;
 278                 case CT_OBJBEZIERS:
 279                         Debug("Bezier data...");
 280                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 281                         break;
 282
 283                 case CT_OBJPATHS:
 284                         Debug("Path data...");
 285                         Warn("Not handled because lazy");
 286                         break;
 287                 }
 288         }
 289         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 290 #ifndef QUADTREE_DISABLED
 291         if (m_quadtree.root_id == QUADTREE_EMPTY)
 292         {
 293                 GenBaseQuadtree();
 294         }
 295 #endif
 296 }
 297
 298 unsigned Document::AddPath(unsigned start_index, unsigned end_index, const Colour & fill)
 299 {
 300         Path path(m_objects, start_index, end_index, fill);
 301         unsigned data_index = AddPathData(path);
 302         Rect bounds = path.SolveBounds(m_objects);
 303         unsigned result = Add(PATH, bounds,data_index);
 304         return result;
 305 }
 306
 307 /**
 308  * Add a Bezier using Absolute coords
 309  */
 310 unsigned Document::AddBezier(const Bezier & bezier)
 311 {
 312         Rect bounds = bezier.SolveBounds();
 313         Bezier data = bezier.ToRelative(bounds); // Relative
 314         if (data.ToAbsolute(bounds) != bezier)
 315         {
 316                 Error("%s != %s", data.ToAbsolute(Rect(0,0,1,1)).Str().c_str(),
 317                         bezier.Str().c_str());
 318                 Fatal("ToAbsolute on ToRelative does not give original Bezier");
 319         }
 320         unsigned index = AddBezierData(data);
 321         return Add(BEZIER, bounds, index);
 322 }
 323
 324 unsigned Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 325 {
 326         m_objects.types.push_back(type);
 327         m_objects.bounds.push_back(bounds);
 328         m_objects.data_indices.push_back(data_index);
 329         return (m_count++); // Why can't we just use the size of types or something?
 330 }
 331
 332 unsigned Document::AddBezierData(const Bezier & bezier)
 333 {
 334         m_objects.beziers.push_back(bezier);
 335         return m_objects.beziers.size()-1;
 336 }
 337
 338 unsigned Document::AddPathData(const Path & path)
 339 {
 340         m_objects.paths.push_back(path);
 341         return m_objects.paths.size()-1;
 342 }
 343
 344 void Document::DebugDumpObjects()
 345 {
 346         Debug("Objects for Document %p are:", this);
 347         for (unsigned id = 0; id < ObjectCount(); ++id)
 348         {
 349                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 350         }
 351 }
 352
 353 bool Document::operator==(const Document & equ) const
 354 {
 355         return (ObjectCount() == equ.ObjectCount()
 356                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 357                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 358                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 359 }
 360
 361
 362
 363 // Behold my amazing tokenizing abilities
 364 static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
 365 {
 366         token.clear();
 367         while (i < d.size() && iswspace(d[i]))
 368         {
 369                 ++i;
 370         }
 371
 372         while (i < d.size())
 373         {
 374                 if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
 375                 {
 376                         if (token.size() == 0 && !iswspace(d[i]))
 377                         {
 378                                 token += d[i++];
 379                         }
 380                         break;
 381                 }
 382                 token += d[i++];
 383         }
 384         //Debug("Got token \"%s\"", token.c_str());
 385         return token;
 386 }
 387
 388 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
 389 {
 390         string token("");
 391         while (GetToken(d, token, i, delims) == ",");
 392         x = strtod(token.c_str(),NULL);
 393         if (GetToken(d, token, i, delims) != ",")
 394         {
 395                 Fatal("Expected \",\" seperating x,y pair");
 396         }
 397         y = strtod(GetToken(d, token, i, delims).c_str(),NULL);
 398 }
 399
 400 static bool GetKeyValuePair(const string & d, string & key, string & value, unsigned & i, const string & delims = "()[],{}<>;:=")
 401 {
 402         key = "";
 403         string token;
 404         while (GetToken(d, token, i, delims) == ":" || token == ";");
 405         key = token;
 406         if (GetToken(d, token, i, delims) != ":")
 407         {
 408                 Error("Expected \":\" seperating key:value pair");
 409                 return false;
 410         }
 411         value = "";
 412         GetToken(d, value, i, delims);
 413         return true;
 414 }
 415
 416 static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
 417 {
 418         Real x0(x);
 419         x = transform.a * x + transform.c * y + transform.e;
 420         y = transform.b * x0 + transform.d * y + transform.f;
 421 }
 422
 423 void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
 424 {
 425         //Debug("Parsing transform %s", s.c_str());
 426         string token;
 427         string command;
 428         unsigned i = 0;
 429
 430         while (i < s.size())
 431         {
 432                 GetToken(s, command, i);
 433                 if (command == "," || command == "" || command == ":")
 434                 {
 435                         if (i < s.size())
 436                                 GetToken(s, command, i);
 437                         else
 438                                 return;
 439                 }
 440                 //Debug("Token is \"%s\"", command.c_str());
 441
 442                 SVGMatrix delta = {1,0,0,0,1,0};
 443
 444
 445                 assert(GetToken(s,token, i) == "(");
 446                 if (command == "translate")
 447                 {
 448                         GetXYPair(s, delta.e, delta.f, i);
 449                         assert(GetToken(s,token, i) == ")");
 450                 }
 451                 else if (command == "matrix")
 452                 {
 453                         GetXYPair(s, delta.a, delta.b,i);
 454                         GetXYPair(s, delta.c, delta.d,i);
 455                         GetXYPair(s, delta.e, delta.f,i);
 456                         assert(GetToken(s,token, i) == ")");
 457                 }
 458                 else if (command == "scale")
 459                 {
 460                         delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
 461                         GetToken(s, token, i);
 462                         if (token == ",")
 463                         {
 464                                 delta.d = (strtod(GetToken(s,token,i).c_str(), NULL));
 465                                 assert(GetToken(s, token, i) == ")");
 466                         }
 467                         else
 468                         {
 469                                 delta.d = delta.a;
 470                                 assert(token == ")");
 471                         }
 472
 473                 }
 474                 else
 475                 {
 476                         Warn("Unrecognised transform \"%s\", using identity", command.c_str());
 477                 }
 478
 479                 //Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 480                 //Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
 481
 482                 SVGMatrix old(transform);
 483                 transform.a = old.a * delta.a + old.c * delta.b;
 484                 transform.c = old.a * delta.c + old.c * delta.d;
 485                 transform.e = old.a * delta.e + old.c * delta.f + old.e;
 486
 487                 transform.b = old.b * delta.a + old.d * delta.b;
 488                 transform.d = old.b * delta.c + old.d * delta.d;
 489                 transform.f = old.b * delta.e + old.d * delta.f + old.f;
 490
 491                 //Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 492         }
 493 }
 494
 495 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
 496 {
 497         //Debug("Parse node <%s>", root.name());
 498
 499
 500         for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
 501         {
 502                 SVGMatrix transform(parent_transform);
 503                 pugi::xml_attribute attrib_trans = child.attribute("transform");
 504                 if (!attrib_trans.empty())
 505                 {
 506                         ParseSVGTransform(attrib_trans.as_string(), transform);
 507                 }
 508
 509
 510
 511                 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
 512                         || strcmp(child.name(), "group") == 0)
 513                 {
 514
 515                         ParseSVGNode(child, transform);
 516                         continue;
 517                 }
 518                 else if (strcmp(child.name(), "path") == 0)
 519                 {
 520                         string d = child.attribute("d").as_string();
 521                         //Debug("Path data attribute is \"%s\"", d.c_str());
 522                         bool closed = false;
 523                         pair<unsigned, unsigned> range = ParseSVGPathData(d, transform, closed);
 524                         if (closed)
 525                         {
 526                                 Colour c(0,0,0,0);
 527                                 string colour_str("");
 528                                 map<string, string> style;
 529                                 if (child.attribute("style"))
 530                                 {
 531                                         ParseSVGStyleData(child.attribute("style").as_string(), style);
 532                                 }
 533
 534                                 // Determine shading colour
 535                                 if (child.attribute("fill"))
 536                                 {
 537                                         colour_str = child.attribute("fill").as_string();
 538                                 }
 539                                 else if (style.find("fill") != style.end())
 540                                 {
 541                                         colour_str = style["fill"];
 542                                 }
 543                                 if (colour_str == "red")
 544                                         c = {1,0,0,1};
 545                                 else if (colour_str == "blue")
 546                                         c = {0,0,1,1};
 547                                 else if (colour_str == "green")
 548                                         c = {0,1,0,1};
 549                                 else if (colour_str == "black")
 550                                         c = {0,0,0,1};
 551                                 else if (colour_str == "white")
 552                                         c = {1,1,1,1};
 553                                 else if (colour_str.size() == 7 && colour_str[0] == '#')
 554                                 {
 555                                         Debug("Parse colour string: \"%s\"", colour_str.c_str());
 556                                         char comp[2] = {colour_str[1], colour_str[2]};
 557                                         c.r = Real(strtoul(comp, NULL, 16))/Real(255);
 558                                         comp[0] = colour_str[3]; comp[1] = colour_str[4];
 559                                         c.g = Real(strtoul(comp, NULL, 16))/Real(255);
 560                                         comp[0] = colour_str[5]; comp[1] = colour_str[6];
 561                                         c.b = Real(strtoul(comp, NULL, 16))/Real(255);
 562                                         c.a = 1;
 563                                         Debug("Colour is: %f, %f, %f, %f", Float(c.r), Float(c.g), Float(c.b), Float(c.a));
 564                                 }
 565
 566                                 // Determin shading alpha
 567                                 if (child.attribute("fill-opacity"))
 568                                 {
 569                                         c.a = child.attribute("fill-opacity").as_float();
 570                                 }
 571                                 else if (style.find("fill-opacity") != style.end())
 572                                 {
 573                                         c.a = strtod(style["fill-opacity"].c_str(), NULL);
 574                                 }
 575
 576                                         Debug("fill-opacity is %f", Float(c.a));
 577                                 AddPath(range.first, range.second, c);
 578                         }
 579
 580                 }
 581                 else if (strcmp(child.name(), "line") == 0)
 582                 {
 583                         Real x0(child.attribute("x1").as_float());
 584                         Real y0(child.attribute("y1").as_float());
 585                         Real x1(child.attribute("x2").as_float());
 586                         Real y1(child.attribute("y2").as_float());
 587                         TransformXYPair(x0,y0,transform);
 588                         TransformXYPair(x1,y1,transform);
 589                         AddBezier(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
 590                 }
 591                 else if (strcmp(child.name(), "rect") == 0)
 592                 {
 593                         Real coords[4];
 594                         const char * attrib_names[] = {"x", "y", "width", "height"};
 595                         for (size_t i = 0; i < 4; ++i)
 596                                 coords[i] = child.attribute(attrib_names[i]).as_float();
 597
 598                         Real x2(coords[0]+coords[2]);
 599                         Real y2(coords[1]+coords[3]);
 600                         TransformXYPair(coords[0],coords[1],transform); // x, y, transform
 601                         TransformXYPair(x2,y2,transform);
 602                         coords[2] = x2 - coords[0];
 603                         coords[3] = y2 - coords[1];
 604
 605                         bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
 606                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
 607                 }
 608                 else if (strcmp(child.name(), "circle") == 0)
 609                 {
 610                         Real cx = child.attribute("cx").as_float();
 611                         Real cy = child.attribute("cy").as_float();
 612                         Real r = child.attribute("r").as_float();
 613
 614                         Real x = (cx - r);
 615                         Real y = (cy - r);
 616                         TransformXYPair(x,y,transform);
 617                         Real w = Real(2)*r*transform.a; // width scales
 618                         Real h = Real(2)*r*transform.d; // height scales
 619
 620
 621                         Rect rect(x,y,w,h);
 622                         Add(CIRCLE_FILLED, rect,0);
 623                         Debug("Added Circle %s", rect.Str().c_str());
 624                 }
 625                 else if (strcmp(child.name(), "text") == 0)
 626                 {
 627                         Real x = child.attribute("x").as_float();
 628                         Real y = child.attribute("y").as_float();
 629                         TransformXYPair(x,y,transform);
 630                         Debug("Add text \"%s\"", child.child_value());
 631                         AddText(child.child_value(), 0.05, x, y);
 632                 }
 633         }
 634 }
 635
 636 void Document::ParseSVGStyleData(const string & style, map<string, string> & results)
 637 {
 638         unsigned i = 0;
 639         string key;
 640         string value;
 641         while (i < style.size() && GetKeyValuePair(style, key, value, i))
 642         {
 643                 results[key] = value;
 644         }
 645 }
 646
 647 /**
 648  * Parse an SVG string into a rectangle
 649  */
 650 void Document::ParseSVG(const string & input, const Rect & bounds)
 651 {
 652         using namespace pugi;
 653
 654         xml_document doc_xml;
 655         xml_parse_result result = doc_xml.load(input.c_str());
 656
 657         if (!result)
 658                 Error("Couldn't parse SVG input - %s", result.description());
 659
 660         Debug("Loaded XML - %s", result.description());
 661         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 662         ParseSVGNode(doc_xml, transform);
 663 }
 664
 665 /**
 666  * Load an SVG into a rectangle
 667  */
 668 void Document::LoadSVG(const string & filename, const Rect & bounds)
 669 {
 670         using namespace pugi;
 671
 672         xml_document doc_xml;
 673         ifstream input(filename.c_str(), ios_base::in);
 674         xml_parse_result result = doc_xml.load(input);
 675
 676         if (!result)
 677                 Error("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 678
 679         Debug("Loaded XML - %s", result.description());
 680
 681         input.close();
 682                                                 // a c e, b d f
 683         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 684         ParseSVGNode(doc_xml, transform);
 685 }
 686
 687
 688
 689 // Fear the wrath of the tokenizing svg data
 690 // Seriously this isn't really very DOM-like at all is it?
 691 pair<unsigned, unsigned> Document::ParseSVGPathData(const string & d, const SVGMatrix & transform, bool & closed)
 692 {
 693         closed = false;
 694         Real x[4] = {0,0,0,0};
 695         Real y[4] = {0,0,0,0};
 696
 697         string token("");
 698         string command("m");
 699
 700         Real x0(0);
 701         Real y0(0);
 702
 703         unsigned i = 0;
 704         unsigned prev_i = 0;
 705
 706         bool start = false;
 707
 708
 709         static string delims("()[],{}<>;:=LlHhVvmMqQzZcC");
 710
 711         pair<unsigned, unsigned> range(m_count, m_count);
 712
 713         while (i < d.size() && GetToken(d, token, i, delims).size() > 0)
 714         {
 715                 if (isalpha(token[0]))
 716                         command = token;
 717                 else
 718                 {
 719                         i = prev_i; // hax
 720                         if(command == "")
 721                                 command = "L";
 722                 }
 723
 724                 bool relative = islower(command[0]);
 725
 726                 if (command == "m" || command == "M")
 727                 {
 728                         //Debug("Construct moveto command");
 729                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 730                         assert(GetToken(d,token,i,delims) == ",");
 731                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 732
 733                         x[0] = (relative) ? x[0] + dx : dx;
 734                         y[0] = (relative) ? y[0] + dy : dy;
 735
 736                         x0 = x[0];
 737                         y0 = y[0];
 738                         //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 739                         command = (command == "m") ? "l" : "L";
 740                 }
 741                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 742                 {
 743                         //Debug("Construct curveto command");
 744                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 745                         assert(GetToken(d,token,i,delims) == ",");
 746                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 747
 748                         x[1] = (relative) ? x[0] + dx : dx;
 749                         y[1] = (relative) ? y[0] + dy : dy;
 750
 751                         dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 752                         assert(GetToken(d,token,i,delims) == ",");
 753                         dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 754
 755                         x[2] = (relative) ? x[0] + dx : dx;
 756                         y[2] = (relative) ? y[0] + dy : dy;
 757
 758                         if (command != "q" && command != "Q")
 759                         {
 760                                 dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 761                                 assert(GetToken(d,token,i,delims) == ",");
 762                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 763                                 x[3] = (relative) ? x[0] + dx : dx;
 764                                 y[3] = (relative) ? y[0] + dy : dy;
 765                         }
 766                         else
 767                         {
 768                                 x[3] = x[2];
 769                                 y[3] = y[2];
 770                                 Real old_x1(x[1]), old_y1(y[1]);
 771                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 772                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 773                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 774                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 775                         }
 776
 777                         Real x3(x[3]);
 778                         Real y3(y[3]);
 779                         for (int j = 0; j < 4; ++j)
 780                                 TransformXYPair(x[j],y[j], transform);
 781
 782                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 783
 784                         //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]));
 785
 786                         x[0] = x3;
 787                         y[0] = y3;
 788
 789
 790                 }
 791                 else if (command == "l" || command == "L" || command == "h" || command == "H" || command == "v" || command == "V")
 792                 {
 793                         //Debug("Construct lineto command, relative %d", relative);
 794
 795                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 796                         Real dy;
 797                         if (command == "l" || command == "L")
 798                         {
 799                                 assert(GetToken(d,token,i,delims) == ",");
 800                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 801                         }
 802                         else if (command == "v" || command == "V")
 803                         {
 804                                 swap(dx,dy);
 805                         }
 806
 807                         x[1] = (relative) ? x[0] + dx : dx;
 808                         y[1] = (relative) ? y[0] + dy : dy;
 809                         if (command == "v" || command == "V")
 810                         {
 811                                 x[1] = x[0];
 812                         }
 813                         else if (command == "h" || command == "H")
 814                         {
 815                                 y[1] = y[0];
 816                         }
 817
 818                         Real x1(x[1]);
 819                         Real y1(y[1]);
 820
 821                         TransformXYPair(x[0],y[0],transform);
 822                         TransformXYPair(x[1],y[1],transform);
 823
 824
 825                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
 826
 827                         //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 828
 829                         x[0] = x1;
 830                         y[0] = y1;
 831
 832                 }
 833                 else if (command == "z" || command == "Z")
 834                 {
 835                         //Debug("Construct returnto command");
 836                         x[1] = x0;
 837                         y[1] = y0;
 838                         x[2] = x0;
 839                         y[2] = y0;
 840                         x[3] = x0;
 841                         y[3] = y0;
 842
 843                         Real x3(x[3]);
 844                         Real y3(y[3]);
 845                         for (int j = 0; j < 4; ++j)
 846                                 TransformXYPair(x[j],y[j], transform);
 847
 848                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 849                         //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 850
 851                         x[0] = x3;
 852                         y[0] = y3;
 853                         command = "m";
 854                         closed = true;
 855                 }
 856                 else
 857                 {
 858                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 859                         command = "m";
 860                 }
 861
 862                 if (!start)
 863                 {
 864                         x0 = x[0];
 865                         y0 = y[0];
 866                         start = true;
 867                 }
 868                 prev_i = i;
 869         }
 870         return range;
 871 }
 872
 873 void Document::SetFont(const string & font_filename)
 874 {
 875         if (m_font_data != NULL)
 876         {
 877                 free(m_font_data);
 878         }
 879
 880         FILE *font_file = fopen(font_filename.c_str(), "rb");
 881         fseek(font_file, 0, SEEK_END);
 882         size_t font_file_size = ftell(font_file);
 883         fseek(font_file, 0, SEEK_SET);
 884         m_font_data = (unsigned char*)malloc(font_file_size);
 885         size_t read = fread(m_font_data, 1, font_file_size, font_file);
 886         if (read != font_file_size)
 887         {
 888                 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
 889         }
 890         fclose(font_file);
 891         stbtt_InitFont(&m_font, m_font_data, 0);
 892 }
 893
 894 void Document::AddText(const string & text, Real scale, Real x, Real y)
 895 {
 896         if (m_font_data == NULL)
 897         {
 898                 Warn("No font loaded");
 899                 return;
 900         }
 901
 902         Real x0(x);
 903         //Real y0(y);
 904         int ascent = 0, descent = 0, line_gap = 0;
 905         stbtt_GetFontVMetrics(&m_font, &ascent, &descent, &line_gap);
 906         float font_scale = scale / (float)(ascent - descent);
 907         Real y_advance = Real(font_scale) * Real(ascent - descent + line_gap);
 908         for (unsigned i = 0; i < text.size(); ++i)
 909         {
 910                 if (text[i] == '\n')
 911                 {
 912                         y += y_advance;
 913                         x = x0;
 914                 }
 915                 if (!isprint(text[i]))
 916                         continue;
 917
 918                 int advance_width = 0, left_side_bearing = 0, kerning = 0;
 919                 stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
 920                 if (i >= 1)
 921                 {
 922                         kerning = stbtt_GetCodepointKernAdvance(&m_font, text[i-1], text[i]);
 923                 }
 924                 x += Real(font_scale) * Real(kerning);
 925                 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
 926                 x += Real(font_scale) * Real(advance_width);
 927         }
 928 }
 929
 930 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 931 {
 932         int glyph_index = stbtt_FindGlyphIndex(font, character);
 933
 934         // Check if there is actully a glyph to render.
 935         if (stbtt_IsGlyphEmpty(font, glyph_index))
 936         {
 937                 return;
 938         }
 939
 940         stbtt_vertex *instructions;
 941         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 942
 943         Real current_x(0), current_y(0);
 944         unsigned start_index = m_count;
 945         unsigned end_index = m_count;
 946         for (int i = 0; i < num_instructions; ++i)
 947         {
 948                 // TTF uses 16-bit signed ints for coordinates:
 949                 // with the y-axis inverted compared to us.
 950                 // Convert and scale any data.
 951                 Real inst_x = Real(instructions[i].x)*scale;
 952                 Real inst_y = Real(instructions[i].y)*-scale;
 953                 Real inst_cx = Real(instructions[i].cx)*scale;
 954                 Real inst_cy = Real(instructions[i].cy)*-scale;
 955                 Real old_x(current_x), old_y(current_y);
 956                 current_x = inst_x;
 957                 current_y = inst_y;
 958
 959                 switch(instructions[i].type)
 960                 {
 961                 // Move To
 962                 case STBTT_vmove:
 963                         break;
 964                 // Line To
 965                 case STBTT_vline:
 966                         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));
 967                         break;
 968                 // Quadratic Bezier To:
 969                 case STBTT_vcurve:
 970                         // Quadratic -> Cubic:
 971                         // - Endpoints are the same.
 972                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
 973                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
 974                         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,
 975                                                 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));
 976                         break;
 977                 }
 978         }
 979
 980         if (start_index < m_count && end_index < m_count)
 981         {
 982                 AddPath(start_index, end_index);
 983         }
 984         Debug("Added Glyph \"%c\" at %f %f, scale %f", (char)character, Float(x), Float(y), Float(scale));
 985
 986         stbtt_FreeShape(font, instructions);
 987 }