src/document.cpp

   1 #include "document.h"
   2 #include "bezier.h"
   3 #include <cstdio>
   4 #include <fstream>
   5
   6 #include "../contrib/pugixml-1.4/src/pugixml.cpp"
   7
   8 #include "stb_truetype.h"
   9
  10 using namespace IPDF;
  11 using namespace std;
  12
  13 //TODO: Make this work for variable sized Reals
  14
  15 // Loads an std::vector<T> of size num_elements from a file.
  16 template<typename T>
  17 static void LoadStructVector(FILE *src_file, size_t num_elems, std::vector<T>& dest)
  18 {
  19         size_t structsread = 0;
  20         dest.resize(num_elems);
  21         structsread = fread(dest.data(), sizeof(T), num_elems, src_file);
  22         if (structsread != num_elems)
  23                 Fatal("Only read %u structs (expected %u)!", structsread, num_elems);
  24 }
  25
  26 // Saves an std::vector<T> to a file. Size must be saves separately.
  27 template<typename T>
  28 static void SaveStructVector(FILE *dst_file, std::vector<T>& src)
  29 {
  30         size_t written = 0;
  31         written = fwrite(src.data(), sizeof(T), src.size(), dst_file);
  32         if (written != src.size())
  33                 Fatal("Only wrote %u structs (expected %u)!", written, src.size());
  34 }
  35
  36 static void WriteChunkHeader(FILE *dst_file, DocChunkTypes type, uint32_t size)
  37 {
  38         size_t written = 0;
  39         written = fwrite(&type, sizeof(type), 1, dst_file);
  40         if (written != 1)
  41                 Fatal("Could not write Chunk header! (ID)");
  42         written = fwrite(&size, sizeof(size), 1, dst_file);
  43         if (written != 1)
  44                 Fatal("Could not write Chunk header (size)!");
  45 }
  46
  47 static bool ReadChunkHeader(FILE *src_file, DocChunkTypes& type, uint32_t& size)
  48 {
  49         if (fread(&type, sizeof(DocChunkTypes), 1, src_file) != 1)
  50                 return false;
  51         if (fread(&size, sizeof(uint32_t), 1, src_file) != 1)
  52                 return false;
  53         return true;
  54 }
  55
  56 void Document::Save(const string & filename)
  57 {
  58         Debug("Saving document to file \"%s\"...", filename.c_str());
  59         FILE * file = fopen(filename.c_str(), "w");
  60         if (file == NULL)
  61                 Fatal("Couldn't open file \"%s\" - %s", filename.c_str(), strerror(errno));
  62
  63         size_t written;
  64         Debug("Number of objects (%u)...", ObjectCount());
  65         WriteChunkHeader(file, CT_NUMOBJS, sizeof(m_count));
  66         written = fwrite(&m_count, sizeof(m_count), 1, file);
  67         if (written != 1)
  68                 Fatal("Failed to write number of objects!");
  69
  70         Debug("Object types...");
  71         WriteChunkHeader(file, CT_OBJTYPES, m_objects.types.size() * sizeof(ObjectType));
  72         SaveStructVector<ObjectType>(file, m_objects.types);
  73
  74         Debug("Object bounds...");
  75         WriteChunkHeader(file, CT_OBJBOUNDS, m_objects.bounds.size() * sizeof(Rect));
  76         SaveStructVector<Rect>(file, m_objects.bounds);
  77
  78         Debug("Object data indices...");
  79         WriteChunkHeader(file, CT_OBJINDICES, m_objects.data_indices.size() * sizeof(unsigned));
  80         SaveStructVector<unsigned>(file, m_objects.data_indices);
  81
  82         Debug("Bezier data...");
  83         WriteChunkHeader(file, CT_OBJBEZIERS, m_objects.beziers.size() * sizeof(uint8_t));
  84         SaveStructVector<Bezier>(file, m_objects.beziers);
  85
  86         int err = fclose(file);
  87         if (err != 0)
  88                 Fatal("Failed to close file \"%s\" - %s", filename.c_str(), strerror(err));
  89
  90         Debug("Successfully saved %u objects to \"%s\"", ObjectCount(), filename.c_str());
  91 }
  92
  93 #ifndef QUADTREE_DISABLED
  94
  95 void Document::GenBaseQuadtree()
  96 {
  97         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QTC_UNKNOWN, 0, ObjectCount()});
  98         m_quadtree.root_id = 0;
  99         GenQuadChild(0, QTC_TOP_LEFT);
 100 }
 101
 102 int Document::ClipObjectToQuadChild(int object_id, QuadTreeNodeChildren type)
 103 {
 104         switch (m_objects.types[object_id])
 105         {
 106         case RECT_FILLED:
 107         case RECT_OUTLINE:
 108                 {
 109                 Rect obj_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 110                 if (obj_bounds.x < 0)
 111                 {
 112                         obj_bounds.w += obj_bounds.x;
 113                         obj_bounds.x = 0;
 114                 }
 115                 if (obj_bounds.y < 0)
 116                 {
 117                         obj_bounds.h += obj_bounds.y;
 118                         obj_bounds.y = 0;
 119                 }
 120                 if (obj_bounds.x + obj_bounds.w > 1)
 121                 {
 122                         obj_bounds.w += (1 - (obj_bounds.x + obj_bounds.w));
 123                 }
 124                 if (obj_bounds.y + obj_bounds.h > 1)
 125                 {
 126                         obj_bounds.h += (1 - (obj_bounds.y + obj_bounds.h));
 127                 }
 128                 m_objects.bounds.push_back(obj_bounds);
 129                 m_objects.types.push_back(m_objects.types[object_id]);
 130                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 131                 return 1;
 132                 }
 133         case BEZIER:
 134                 {
 135                 Rect child_node_bounds = TransformFromQuadChild({0,0,1,1}, type);
 136                 std::vector<Bezier> new_curves = m_objects.beziers[m_objects.data_indices[object_id]].ClipToRectangle(child_node_bounds);
 137                 Rect obj_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 138                 for (size_t i = 0; i < new_curves.size(); ++i)
 139                 {
 140                         unsigned index = AddBezierData(new_curves[i]);
 141                         m_objects.bounds.push_back(obj_bounds);
 142                         m_objects.types.push_back(BEZIER);
 143                         m_objects.data_indices.push_back(index);
 144                 }
 145                 return new_curves.size();
 146                 }
 147         default:
 148                 Debug("Adding %s -> %s", m_objects.bounds[object_id].Str().c_str(), TransformToQuadChild(m_objects.bounds[object_id], type).Str().c_str());
 149                 m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 150                 m_objects.types.push_back(m_objects.types[object_id]);
 151                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 152                 return 1;
 153         }
 154         return 0;
 155 }
 156 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 157 {
 158         QuadTreeIndex new_index = m_quadtree.nodes.size();
 159         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 160
 161         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 162         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 163         {
 164                 if (IntersectsQuadChild(m_objects.bounds[i], type))
 165                 {
 166                         m_count += ClipObjectToQuadChild(i, type);
 167                 }
 168         }
 169         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 170         switch (type)
 171         {
 172                 case QTC_TOP_LEFT:
 173                         m_quadtree.nodes[parent].top_left = new_index;
 174                         break;
 175                 case QTC_TOP_RIGHT:
 176                         m_quadtree.nodes[parent].top_right = new_index;
 177                         break;
 178                 case QTC_BOTTOM_LEFT:
 179                         m_quadtree.nodes[parent].bottom_left = new_index;
 180                         break;
 181                 case QTC_BOTTOM_RIGHT:
 182                         m_quadtree.nodes[parent].bottom_right = new_index;
 183                         break;
 184                 default:
 185                         Fatal("Tried to add a QuadTree child of invalid type!");
 186         }
 187         return new_index;
 188 }
 189
 190 // Reparent a quadtree node, making it the "type" child of a new node.
 191 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 192 {
 193         QuadTreeIndex new_index = m_quadtree.nodes.size();
 194         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
 195
 196         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 197         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 198         {
 199                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 200                 m_objects.types.push_back(m_objects.types[i]);
 201                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 202                 m_count++;
 203         }
 204         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 205         switch (type)
 206         {
 207                 case QTC_TOP_LEFT:
 208                         m_quadtree.nodes[new_index].top_left = child;
 209                         break;
 210                 case QTC_TOP_RIGHT:
 211                         m_quadtree.nodes[new_index].top_right = child;
 212                         break;
 213                 case QTC_BOTTOM_LEFT:
 214                         m_quadtree.nodes[new_index].bottom_left = child;
 215                         break;
 216                 case QTC_BOTTOM_RIGHT:
 217                         m_quadtree.nodes[new_index].bottom_right = child;
 218                         break;
 219                 default:
 220                         Fatal("Tried to add a QuadTree child of invalid type!");
 221         }
 222         return new_index;
 223 }
 224
 225 #endif
 226
 227 void Document::Load(const string & filename)
 228 {
 229         m_objects.bounds.clear();
 230         m_count = 0;
 231         if (filename == "")
 232         {
 233                 Debug("Loaded empty document.");
 234                 return;
 235         }
 236         Debug("Loading document from file \"%s\"", filename.c_str());
 237         FILE * file = fopen(filename.c_str(), "r");
 238         if (file == NULL)
 239                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 240
 241         size_t read;
 242
 243         DocChunkTypes chunk_type;
 244         uint32_t chunk_size;
 245         while (ReadChunkHeader(file, chunk_type, chunk_size))
 246         {
 247                 switch(chunk_type)
 248                 {
 249                 case CT_NUMOBJS:
 250                         read = fread(&m_count, sizeof(m_count), 1, file);
 251                         if (read != 1)
 252                                 Fatal("Failed to read number of objects!");
 253                         Debug("Number of objects: %u", ObjectCount());
 254                         break;
 255                 case CT_OBJTYPES:
 256                         Debug("Object types...");
 257                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 258                         break;
 259                 case CT_OBJBOUNDS:
 260                         Debug("Object bounds...");
 261                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 262                         break;
 263                 case CT_OBJINDICES:
 264                         Debug("Object data indices...");
 265                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 266                         break;
 267                 case CT_OBJBEZIERS:
 268                         Debug("Bezier data...");
 269                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 270                         break;
 271
 272                 case CT_OBJGROUPS:
 273                         Debug("Group data...");
 274                         Warn("Not handled because lazy");
 275                         break;
 276                 }
 277         }
 278         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 279 #ifndef QUADTREE_DISABLED
 280         if (m_quadtree.root_id == QUADTREE_EMPTY)
 281         {
 282                 GenBaseQuadtree();
 283         }
 284 #endif
 285 }
 286
 287 unsigned Document::AddGroup(unsigned start_index, unsigned end_index, const Colour & shading)
 288 {
 289         Real xmin = 0; Real ymin = 0;
 290         Real xmax = 0; Real ymax = 0;
 291
 292         for (unsigned i = start_index; i <= end_index; ++i)
 293         {
 294                 Rect & objb = m_objects.bounds[i];
 295
 296                 if (i == start_index || objb.x < xmin)
 297                         xmin = objb.x;
 298                 if (i == start_index || (objb.x+objb.w) > xmax)
 299                         xmax = (objb.x+objb.w);
 300
 301                 if (i == start_index || objb.y < ymin)
 302                         ymin = objb.y;
 303                 if (i == start_index || (objb.y+objb.h) > ymax)
 304                         ymax = (objb.y+objb.h);
 305         }
 306
 307         Rect bounds(xmin,ymin, xmax-xmin, ymax-ymin);
 308
 309         Group group = {start_index, end_index, shading};
 310
 311         unsigned data_index = AddGroupData(group);
 312         unsigned result = Add(GROUP, bounds,data_index);
 313         return result;
 314 }
 315
 316 /**
 317  * Add a Bezier using Absolute coords
 318  */
 319 unsigned Document::AddBezier(const Bezier & bezier)
 320 {
 321         Rect bounds = bezier.SolveBounds();
 322         Bezier data = bezier.ToRelative(bounds); // Relative
 323         unsigned index = AddBezierData(data);
 324         return Add(BEZIER, bounds, index);
 325 }
 326
 327 unsigned Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 328 {
 329         m_objects.types.push_back(type);
 330         m_objects.bounds.push_back(bounds);
 331         m_objects.data_indices.push_back(data_index);
 332         return (m_count++); // Why can't we just use the size of types or something?
 333 }
 334
 335 unsigned Document::AddBezierData(const Bezier & bezier)
 336 {
 337         m_objects.beziers.push_back(bezier);
 338         return m_objects.beziers.size()-1;
 339 }
 340
 341 unsigned Document::AddGroupData(const Group & group)
 342 {
 343         m_objects.groups.push_back(group);
 344         return m_objects.groups.size()-1;
 345 }
 346
 347 void Document::DebugDumpObjects()
 348 {
 349         Debug("Objects for Document %p are:", this);
 350         for (unsigned id = 0; id < ObjectCount(); ++id)
 351         {
 352                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 353         }
 354 }
 355
 356 bool Document::operator==(const Document & equ) const
 357 {
 358         return (ObjectCount() == equ.ObjectCount()
 359                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 360                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 361                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 362 }
 363
 364
 365
 366 // Behold my amazing tokenizing abilities
 367 static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
 368 {
 369         token.clear();
 370         while (i < d.size() && iswspace(d[i]))
 371         {
 372                 ++i;
 373         }
 374
 375         while (i < d.size())
 376         {
 377                 if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
 378                 {
 379                         if (token.size() == 0 && !iswspace(d[i]))
 380                         {
 381                                 token += d[i++];
 382                         }
 383                         break;
 384                 }
 385                 token += d[i++];
 386         }
 387         //Debug("Got token \"%s\"", token.c_str());
 388         return token;
 389 }
 390
 391 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
 392 {
 393         string token("");
 394         while (GetToken(d, token, i, delims) == ",");
 395         x = strtod(token.c_str(),NULL);
 396         if (GetToken(d, token, i, delims) != ",")
 397         {
 398                 Fatal("Expected \",\" seperating x,y pair");
 399         }
 400         y = strtod(GetToken(d, token, i, delims).c_str(),NULL);
 401 }
 402
 403 static bool GetKeyValuePair(const string & d, string & key, string & value, unsigned & i, const string & delims = "()[],{}<>;:=")
 404 {
 405         key = "";
 406         string token;
 407         while (GetToken(d, token, i, delims) == ":" || token == ";");
 408         key = token;
 409         if (GetToken(d, token, i, delims) != ":")
 410         {
 411                 Error("Expected \":\" seperating key:value pair");
 412                 return false;
 413         }
 414         value = "";
 415         GetToken(d, value, i, delims);
 416         return true;
 417 }
 418
 419 static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
 420 {
 421         Real x0(x);
 422         x = transform.a * x + transform.c * y + transform.e;
 423         y = transform.b * x0 + transform.d * y + transform.f;
 424 }
 425
 426 void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
 427 {
 428         //Debug("Parsing transform %s", s.c_str());
 429         string token;
 430         string command;
 431         unsigned i = 0;
 432
 433         while (i < s.size())
 434         {
 435                 GetToken(s, command, i);
 436                 if (command == "," || command == "" || command == ":")
 437                 {
 438                         if (i < s.size())
 439                                 GetToken(s, command, i);
 440                         else
 441                                 return;
 442                 }
 443                 //Debug("Token is \"%s\"", command.c_str());
 444
 445                 SVGMatrix delta = {1,0,0,0,1,0};
 446
 447
 448                 assert(GetToken(s,token, i) == "(");
 449                 if (command == "translate")
 450                 {
 451                         GetXYPair(s, delta.e, delta.f, i);
 452                         assert(GetToken(s,token, i) == ")");
 453                 }
 454                 else if (command == "matrix")
 455                 {
 456                         GetXYPair(s, delta.a, delta.b,i);
 457                         GetXYPair(s, delta.c, delta.d,i);
 458                         GetXYPair(s, delta.e, delta.f,i);
 459                         assert(GetToken(s,token, i) == ")");
 460                 }
 461                 else if (command == "scale")
 462                 {
 463                         delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
 464                         GetToken(s, token, i);
 465                         if (token == ",")
 466                         {
 467                                 delta.d = (strtod(GetToken(s,token,i).c_str(), NULL));
 468                                 assert(GetToken(s, token, i) == ")");
 469                         }
 470                         else
 471                         {
 472                                 delta.d = delta.a;
 473                                 assert(token == ")");
 474                         }
 475
 476                 }
 477                 else
 478                 {
 479                         Warn("Unrecognised transform \"%s\", using identity", command.c_str());
 480                 }
 481
 482                 //Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 483                 //Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
 484
 485                 SVGMatrix old(transform);
 486                 transform.a = old.a * delta.a + old.c * delta.b;
 487                 transform.c = old.a * delta.c + old.c * delta.d;
 488                 transform.e = old.a * delta.e + old.c * delta.f + old.e;
 489
 490                 transform.b = old.b * delta.a + old.d * delta.b;
 491                 transform.d = old.b * delta.c + old.d * delta.d;
 492                 transform.f = old.b * delta.e + old.d * delta.f + old.f;
 493
 494                 //Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 495         }
 496 }
 497
 498 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
 499 {
 500         //Debug("Parse node <%s>", root.name());
 501
 502
 503         for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
 504         {
 505                 SVGMatrix transform(parent_transform);
 506                 pugi::xml_attribute attrib_trans = child.attribute("transform");
 507                 if (!attrib_trans.empty())
 508                 {
 509                         ParseSVGTransform(attrib_trans.as_string(), transform);
 510                 }
 511
 512
 513
 514                 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
 515                         || strcmp(child.name(), "group") == 0)
 516                 {
 517
 518                         ParseSVGNode(child, transform);
 519                         continue;
 520                 }
 521                 else if (strcmp(child.name(), "path") == 0)
 522                 {
 523                         string d = child.attribute("d").as_string();
 524                         //Debug("Path data attribute is \"%s\"", d.c_str());
 525                         bool closed = false;
 526                         pair<unsigned, unsigned> range = ParseSVGPathData(d, transform, closed);
 527                         if (closed)
 528                         {
 529                                 Colour c(0,0,0,0);
 530                                 string colour_str("");
 531                                 map<string, string> style;
 532                                 if (child.attribute("style"))
 533                                 {
 534                                         ParseSVGStyleData(child.attribute("style").as_string(), style);
 535                                 }
 536
 537                                 // Determine shading colour
 538                                 if (child.attribute("fill"))
 539                                 {
 540                                         colour_str = child.attribute("fill").as_string();
 541                                 }
 542                                 else if (style.find("fill") != style.end())
 543                                 {
 544                                         colour_str = style["fill"];
 545                                 }
 546                                 if (colour_str == "red")
 547                                         c = {1,0,0,1};
 548                                 else if (colour_str == "blue")
 549                                         c = {0,0,1,1};
 550                                 else if (colour_str == "green")
 551                                         c = {0,1,0,1};
 552                                 else if (colour_str == "black")
 553                                         c = {0,0,0,1};
 554                                 else if (colour_str == "white")
 555                                         c = {1,1,1,1};
 556                                 else if (colour_str.size() == 7 && colour_str[0] == '#')
 557                                 {
 558                                         Debug("Parse colour string: \"%s\"", colour_str.c_str());
 559                                         char comp[2] = {colour_str[1], colour_str[2]};
 560                                         c.r = Real(strtoul(comp, NULL, 16))/Real(255);
 561                                         comp[0] = colour_str[3]; comp[1] = colour_str[4];
 562                                         c.g = Real(strtoul(comp, NULL, 16))/Real(255);
 563                                         comp[0] = colour_str[5]; comp[1] = colour_str[6];
 564                                         c.b = Real(strtoul(comp, NULL, 16))/Real(255);
 565                                         c.a = 1;
 566                                         Debug("Colour is: %f, %f, %f, %f", Float(c.r), Float(c.g), Float(c.b), Float(c.a));
 567                                 }
 568
 569                                 // Determin shading alpha
 570                                 if (child.attribute("fill-opacity"))
 571                                 {
 572                                         c.a = child.attribute("fill-opacity").as_float();
 573                                 }
 574                                 else if (style.find("fill-opacity") != style.end())
 575                                 {
 576                                         c.a = strtod(style["fill-opacity"].c_str(), NULL);
 577                                 }
 578
 579                                         Debug("fill-opacity is %f", Float(c.a));
 580                                 AddGroup(range.first, range.second, c);
 581                         }
 582
 583                 }
 584                 else if (strcmp(child.name(), "line") == 0)
 585                 {
 586                         Real x0(child.attribute("x1").as_float());
 587                         Real y0(child.attribute("y1").as_float());
 588                         Real x1(child.attribute("x2").as_float());
 589                         Real y1(child.attribute("y2").as_float());
 590                         TransformXYPair(x0,y0,transform);
 591                         TransformXYPair(x1,y1,transform);
 592                         AddBezier(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
 593                 }
 594                 else if (strcmp(child.name(), "rect") == 0)
 595                 {
 596                         Real coords[4];
 597                         const char * attrib_names[] = {"x", "y", "width", "height"};
 598                         for (size_t i = 0; i < 4; ++i)
 599                                 coords[i] = child.attribute(attrib_names[i]).as_float();
 600
 601                         Real x2(coords[0]+coords[2]);
 602                         Real y2(coords[1]+coords[3]);
 603                         TransformXYPair(coords[0],coords[1],transform); // x, y, transform
 604                         TransformXYPair(x2,y2,transform);
 605                         coords[2] = x2 - coords[0];
 606                         coords[3] = y2 - coords[1];
 607
 608                         bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
 609                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
 610                 }
 611                 else if (strcmp(child.name(), "circle") == 0)
 612                 {
 613                         Real cx = child.attribute("cx").as_float();
 614                         Real cy = child.attribute("cy").as_float();
 615                         Real r = child.attribute("r").as_float();
 616
 617                         Real x = (cx - r);
 618                         Real y = (cy - r);
 619                         TransformXYPair(x,y,transform);
 620                         Real w = Real(2)*r*transform.a; // width scales
 621                         Real h = Real(2)*r*transform.d; // height scales
 622
 623
 624                         Rect rect(x,y,w,h);
 625                         Add(CIRCLE_FILLED, rect,0);
 626                         Debug("Added Circle %s", rect.Str().c_str());
 627                 }
 628                 else if (strcmp(child.name(), "text") == 0)
 629                 {
 630                         Real x = child.attribute("x").as_float();
 631                         Real y = child.attribute("y").as_float();
 632                         TransformXYPair(x,y,transform);
 633                         Debug("Add text \"%s\"", child.child_value());
 634                         AddText(child.child_value(), 0.05, x, y);
 635                 }
 636         }
 637 }
 638
 639 void Document::ParseSVGStyleData(const string & style, map<string, string> & results)
 640 {
 641         unsigned i = 0;
 642         string key;
 643         string value;
 644         while (i < style.size() && GetKeyValuePair(style, key, value, i))
 645         {
 646                 results[key] = value;
 647         }
 648 }
 649
 650 /**
 651  * Parse an SVG string into a rectangle
 652  */
 653 void Document::ParseSVG(const string & input, const Rect & bounds)
 654 {
 655         using namespace pugi;
 656
 657         xml_document doc_xml;
 658         xml_parse_result result = doc_xml.load(input.c_str());
 659
 660         if (!result)
 661                 Error("Couldn't parse SVG input - %s", result.description());
 662
 663         Debug("Loaded XML - %s", result.description());
 664         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 665         ParseSVGNode(doc_xml, transform);
 666 }
 667
 668 /**
 669  * Load an SVG into a rectangle
 670  */
 671 void Document::LoadSVG(const string & filename, const Rect & bounds)
 672 {
 673         using namespace pugi;
 674
 675         xml_document doc_xml;
 676         ifstream input(filename.c_str(), ios_base::in);
 677         xml_parse_result result = doc_xml.load(input);
 678
 679         if (!result)
 680                 Error("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 681
 682         Debug("Loaded XML - %s", result.description());
 683
 684         input.close();
 685                                                 // a c e, b d f
 686         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 687         ParseSVGNode(doc_xml, transform);
 688 }
 689
 690
 691
 692 // Fear the wrath of the tokenizing svg data
 693 // Seriously this isn't really very DOM-like at all is it?
 694 pair<unsigned, unsigned> Document::ParseSVGPathData(const string & d, const SVGMatrix & transform, bool & closed)
 695 {
 696         closed = false;
 697         Real x[4] = {0,0,0,0};
 698         Real y[4] = {0,0,0,0};
 699
 700         string token("");
 701         string command("m");
 702
 703         Real x0(0);
 704         Real y0(0);
 705
 706         unsigned i = 0;
 707         unsigned prev_i = 0;
 708
 709         bool start = false;
 710
 711
 712         static string delims("()[],{}<>;:=LlHhVvmMqQzZcC");
 713
 714         pair<unsigned, unsigned> range(m_count, m_count);
 715
 716         while (i < d.size() && GetToken(d, token, i, delims).size() > 0)
 717         {
 718                 if (isalpha(token[0]))
 719                         command = token;
 720                 else
 721                 {
 722                         i = prev_i; // hax
 723                         if(command == "")
 724                                 command = "L";
 725                 }
 726
 727                 bool relative = islower(command[0]);
 728
 729                 if (command == "m" || command == "M")
 730                 {
 731                         //Debug("Construct moveto command");
 732                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 733                         assert(GetToken(d,token,i,delims) == ",");
 734                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 735
 736                         x[0] = (relative) ? x[0] + dx : dx;
 737                         y[0] = (relative) ? y[0] + dy : dy;
 738
 739                         x0 = x[0];
 740                         y0 = y[0];
 741                         //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 742                         command = (command == "m") ? "l" : "L";
 743                 }
 744                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 745                 {
 746                         //Debug("Construct curveto command");
 747                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 748                         assert(GetToken(d,token,i,delims) == ",");
 749                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 750
 751                         x[1] = (relative) ? x[0] + dx : dx;
 752                         y[1] = (relative) ? y[0] + dy : dy;
 753
 754                         dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 755                         assert(GetToken(d,token,i,delims) == ",");
 756                         dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 757
 758                         x[2] = (relative) ? x[0] + dx : dx;
 759                         y[2] = (relative) ? y[0] + dy : dy;
 760
 761                         if (command != "q" && command != "Q")
 762                         {
 763                                 dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 764                                 assert(GetToken(d,token,i,delims) == ",");
 765                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 766                                 x[3] = (relative) ? x[0] + dx : dx;
 767                                 y[3] = (relative) ? y[0] + dy : dy;
 768                         }
 769                         else
 770                         {
 771                                 x[3] = x[2];
 772                                 y[3] = y[2];
 773                                 Real old_x1(x[1]), old_y1(y[1]);
 774                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 775                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 776                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 777                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 778                         }
 779
 780                         Real x3(x[3]);
 781                         Real y3(y[3]);
 782                         for (int j = 0; j < 4; ++j)
 783                                 TransformXYPair(x[j],y[j], transform);
 784
 785                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 786
 787                         //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]));
 788
 789                         x[0] = x3;
 790                         y[0] = y3;
 791
 792
 793                 }
 794                 else if (command == "l" || command == "L" || command == "h" || command == "H" || command == "v" || command == "V")
 795                 {
 796                         //Debug("Construct lineto command, relative %d", relative);
 797
 798                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 799                         Real dy;
 800                         if (command == "l" || command == "L")
 801                         {
 802                                 assert(GetToken(d,token,i,delims) == ",");
 803                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 804                         }
 805                         else if (command == "v" || command == "V")
 806                         {
 807                                 swap(dx,dy);
 808                         }
 809
 810                         x[1] = (relative) ? x[0] + dx : dx;
 811                         y[1] = (relative) ? y[0] + dy : dy;
 812                         if (command == "v" || command == "V")
 813                         {
 814                                 x[1] = x[0];
 815                         }
 816                         else if (command == "h" || command == "H")
 817                         {
 818                                 y[1] = y[0];
 819                         }
 820
 821                         Real x1(x[1]);
 822                         Real y1(y[1]);
 823
 824                         TransformXYPair(x[0],y[0],transform);
 825                         TransformXYPair(x[1],y[1],transform);
 826
 827
 828                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
 829
 830                         //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 831
 832                         x[0] = x1;
 833                         y[0] = y1;
 834
 835                 }
 836                 else if (command == "z" || command == "Z")
 837                 {
 838                         //Debug("Construct returnto command");
 839                         x[1] = x0;
 840                         y[1] = y0;
 841                         x[2] = x0;
 842                         y[2] = y0;
 843                         x[3] = x0;
 844                         y[3] = y0;
 845
 846                         Real x3(x[3]);
 847                         Real y3(y[3]);
 848                         for (int j = 0; j < 4; ++j)
 849                                 TransformXYPair(x[j],y[j], transform);
 850
 851                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 852                         //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 853
 854                         x[0] = x3;
 855                         y[0] = y3;
 856                         command = "m";
 857                         closed = true;
 858                 }
 859                 else
 860                 {
 861                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 862                         command = "m";
 863                 }
 864
 865                 if (!start)
 866                 {
 867                         x0 = x[0];
 868                         y0 = y[0];
 869                         start = true;
 870                 }
 871                 prev_i = i;
 872         }
 873         return range;
 874 }
 875
 876 void Document::SetFont(const string & font_filename)
 877 {
 878         if (m_font_data != NULL)
 879         {
 880                 free(m_font_data);
 881         }
 882
 883         FILE *font_file = fopen(font_filename.c_str(), "rb");
 884         fseek(font_file, 0, SEEK_END);
 885         size_t font_file_size = ftell(font_file);
 886         fseek(font_file, 0, SEEK_SET);
 887         m_font_data = (unsigned char*)malloc(font_file_size);
 888         size_t read = fread(m_font_data, 1, font_file_size, font_file);
 889         if (read != font_file_size)
 890         {
 891                 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
 892         }
 893         fclose(font_file);
 894         stbtt_InitFont(&m_font, m_font_data, 0);
 895 }
 896
 897 void Document::AddText(const string & text, Real scale, Real x, Real y)
 898 {
 899         if (m_font_data == NULL)
 900         {
 901                 Warn("No font loaded");
 902                 return;
 903         }
 904
 905         Real x0(x);
 906         //Real y0(y);
 907         int ascent = 0, descent = 0, line_gap = 0;
 908         stbtt_GetFontVMetrics(&m_font, &ascent, &descent, &line_gap);
 909         float font_scale = scale / (float)(ascent - descent);
 910         Real y_advance = Real(font_scale) * Real(ascent - descent + line_gap);
 911         for (unsigned i = 0; i < text.size(); ++i)
 912         {
 913                 if (text[i] == '\n')
 914                 {
 915                         y += y_advance;
 916                         x = x0;
 917                 }
 918                 if (!isprint(text[i]))
 919                         continue;
 920
 921                 int advance_width = 0, left_side_bearing = 0, kerning = 0;
 922                 stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
 923                 if (i >= 1)
 924                 {
 925                         kerning = stbtt_GetCodepointKernAdvance(&m_font, text[i-1], text[i]);
 926                 }
 927                 x += Real(font_scale) * Real(kerning);
 928                 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
 929                 x += Real(font_scale) * Real(advance_width);
 930         }
 931 }
 932
 933 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 934 {
 935         int glyph_index = stbtt_FindGlyphIndex(font, character);
 936
 937         // Check if there is actully a glyph to render.
 938         if (stbtt_IsGlyphEmpty(font, glyph_index))
 939         {
 940                 return;
 941         }
 942
 943         stbtt_vertex *instructions;
 944         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 945
 946         Real current_x(0), current_y(0);
 947         unsigned start_index = m_count;
 948         unsigned end_index = m_count;
 949         for (int i = 0; i < num_instructions; ++i)
 950         {
 951                 // TTF uses 16-bit signed ints for coordinates:
 952                 // with the y-axis inverted compared to us.
 953                 // Convert and scale any data.
 954                 Real inst_x = Real(instructions[i].x)*scale;
 955                 Real inst_y = Real(instructions[i].y)*-scale;
 956                 Real inst_cx = Real(instructions[i].cx)*scale;
 957                 Real inst_cy = Real(instructions[i].cy)*-scale;
 958                 Real old_x(current_x), old_y(current_y);
 959                 current_x = inst_x;
 960                 current_y = inst_y;
 961
 962                 switch(instructions[i].type)
 963                 {
 964                 // Move To
 965                 case STBTT_vmove:
 966                         break;
 967                 // Line To
 968                 case STBTT_vline:
 969                         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));
 970                         break;
 971                 // Quadratic Bezier To:
 972                 case STBTT_vcurve:
 973                         // Quadratic -> Cubic:
 974                         // - Endpoints are the same.
 975                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
 976                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
 977                         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,
 978                                                 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));
 979                         break;
 980                 }
 981         }
 982
 983         if (start_index < m_count && end_index < m_count)
 984         {
 985                 AddGroup(start_index, end_index);
 986         }
 987         Debug("Added Glyph \"%c\" at %f %f, scale %f", (char)character, Float(x), Float(y), Float(scale));
 988
 989         stbtt_FreeShape(font, instructions);
 990 }