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 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 103 {
 104         QuadTreeIndex new_index = m_quadtree.nodes.size();
 105         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 106
 107         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 108         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 109         {
 110                 if (ContainedInQuadChild(m_objects.bounds[i], type))
 111                 {
 112                         m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[i], type));
 113                         m_objects.types.push_back(m_objects.types[i]);
 114                         m_objects.data_indices.push_back(m_objects.data_indices[i]);
 115                         m_count++;
 116                 }
 117         }
 118         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 119         switch (type)
 120         {
 121                 case QTC_TOP_LEFT:
 122                         m_quadtree.nodes[parent].top_left = new_index;
 123                         break;
 124                 case QTC_TOP_RIGHT:
 125                         m_quadtree.nodes[parent].top_right = new_index;
 126                         break;
 127                 case QTC_BOTTOM_LEFT:
 128                         m_quadtree.nodes[parent].bottom_left = new_index;
 129                         break;
 130                 case QTC_BOTTOM_RIGHT:
 131                         m_quadtree.nodes[parent].bottom_right = new_index;
 132                         break;
 133                 default:
 134                         Fatal("Tried to add a QuadTree child of invalid type!");
 135         }
 136         return new_index;
 137 }
 138
 139 // Reparent a quadtree node, making it the "type" child of a new node.
 140 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 141 {
 142         QuadTreeIndex new_index = m_quadtree.nodes.size();
 143         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
 144
 145         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 146         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 147         {
 148                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 149                 m_objects.types.push_back(m_objects.types[i]);
 150                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 151                 m_count++;
 152         }
 153         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 154         switch (type)
 155         {
 156                 case QTC_TOP_LEFT:
 157                         m_quadtree.nodes[new_index].top_left = child;
 158                         break;
 159                 case QTC_TOP_RIGHT:
 160                         m_quadtree.nodes[new_index].top_right = child;
 161                         break;
 162                 case QTC_BOTTOM_LEFT:
 163                         m_quadtree.nodes[new_index].bottom_left = child;
 164                         break;
 165                 case QTC_BOTTOM_RIGHT:
 166                         m_quadtree.nodes[new_index].bottom_right = child;
 167                         break;
 168                 default:
 169                         Fatal("Tried to add a QuadTree child of invalid type!");
 170         }
 171         return new_index;
 172 }
 173
 174 #endif
 175
 176 void Document::Load(const string & filename)
 177 {
 178         m_objects.bounds.clear();
 179         m_count = 0;
 180         if (filename == "")
 181         {
 182                 Debug("Loaded empty document.");
 183                 return;
 184         }
 185         Debug("Loading document from file \"%s\"", filename.c_str());
 186         FILE * file = fopen(filename.c_str(), "r");
 187         if (file == NULL)
 188                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 189
 190         size_t read;
 191
 192         DocChunkTypes chunk_type;
 193         uint32_t chunk_size;
 194         while (ReadChunkHeader(file, chunk_type, chunk_size))
 195         {
 196                 switch(chunk_type)
 197                 {
 198                 case CT_NUMOBJS:
 199                         read = fread(&m_count, sizeof(m_count), 1, file);
 200                         if (read != 1)
 201                                 Fatal("Failed to read number of objects!");
 202                         Debug("Number of objects: %u", ObjectCount());
 203                         break;
 204                 case CT_OBJTYPES:
 205                         Debug("Object types...");
 206                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 207                         break;
 208                 case CT_OBJBOUNDS:
 209                         Debug("Object bounds...");
 210                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 211                         break;
 212                 case CT_OBJINDICES:
 213                         Debug("Object data indices...");
 214                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 215                         break;
 216                 case CT_OBJBEZIERS:
 217                         Debug("Bezier data...");
 218                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 219                         break;
 220                 }
 221         }
 222         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 223 #ifndef QUADTREE_DISABLED
 224         if (m_quadtree.root_id == QUADTREE_EMPTY)
 225         {
 226                 GenBaseQuadtree();
 227         }
 228 #endif
 229 }
 230
 231 void Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 232 {
 233         m_objects.types.push_back(type);
 234         m_objects.bounds.push_back(bounds);
 235         m_objects.data_indices.push_back(data_index);
 236         ++m_count; // Why can't we just use the size of types or something?
 237 }
 238
 239 unsigned Document::AddBezierData(const Bezier & bezier)
 240 {
 241         m_objects.beziers.push_back(bezier);
 242         return m_objects.beziers.size()-1;
 243 }
 244
 245
 246 void Document::DebugDumpObjects()
 247 {
 248         Debug("Objects for Document %p are:", this);
 249         for (unsigned id = 0; id < ObjectCount(); ++id)
 250         {
 251                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 252         }
 253 }
 254
 255 bool Document::operator==(const Document & equ) const
 256 {
 257         return (ObjectCount() == equ.ObjectCount()
 258                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 259                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 260                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 261 }
 262
 263
 264
 265 // Behold my amazing tokenizing abilities
 266 static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
 267 {
 268         token.clear();
 269         while (i < d.size() && iswspace(d[i]))
 270         {
 271                 ++i;
 272         }
 273
 274         while (i < d.size())
 275         {
 276                 if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
 277                 {
 278                         if (token.size() == 0 && !iswspace(d[i]))
 279                         {
 280                                 token += d[i++];
 281                         }
 282                         break;
 283                 }
 284                 token += d[i++];
 285         }
 286         //Debug("Got token \"%s\"", token.c_str());
 287         return token;
 288 }
 289
 290 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
 291 {
 292         string token("");
 293         x = strtod(GetToken(d, token, i, delims).c_str(),NULL);
 294         if (GetToken(d, token, i, delims) != ",")
 295         {
 296                 Fatal("Expected \",\" seperating x,y pair");
 297         }
 298         y = strtod(GetToken(d, token, i, delims).c_str(),NULL);
 299 }
 300
 301 static void TransformXYPair(Real & x, Real & y, SVGMatrix & transform)
 302 {
 303         Real x0(x);
 304         x = transform.a * x + transform.c * y + transform.e;
 305         y = transform.b * x0 + transform.d * y + transform.f;
 306 }
 307
 308 void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
 309 {
 310         Debug("Parsing transform %s", s.c_str());
 311         string token;
 312         string command;
 313         unsigned i = 0;
 314         GetToken(s, command, i);
 315         Debug("Token is \"%s\"", command.c_str());
 316
 317         SVGMatrix delta = {1,0,0,1,0,0};
 318
 319
 320         assert(GetToken(s,token, i) == "(");
 321         if (command == "translate")
 322         {
 323                 GetXYPair(s, delta.e, delta.f, i);
 324                 assert(GetToken(s,token, i) == ")");
 325         }
 326         else if (command == "matrix")
 327         {
 328                 GetXYPair(s, delta.a, delta.b,i);
 329                 GetXYPair(s, delta.c, delta.d,i);
 330                 GetXYPair(s, delta.e, delta.f,i);
 331                 assert(GetToken(s,token, i) == ")");
 332         }
 333         else if (command == "scale")
 334         {
 335                 delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
 336                 GetToken(s, token, i);
 337                 if (token != ")")
 338                 {
 339                         delta.b = (strtod(token.c_str(), NULL));
 340                 }
 341                 else
 342                 {
 343                         delta.b = delta.a;
 344                 }
 345
 346         }
 347         else
 348         {
 349                 Warn("Unrecognised transform \"%s\", using identity", command.c_str());
 350         }
 351
 352         Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 353         Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
 354
 355         SVGMatrix old(transform);
 356         transform.a = old.a * delta.a + old.c * delta.b;
 357         transform.c = old.a * delta.c + old.c * delta.d;
 358         transform.e = old.a * delta.e + old.c * delta.f + old.e;
 359
 360         transform.b = old.b * delta.a + old.d * delta.b;
 361         transform.d = old.b * delta.c + old.d * delta.d;
 362         transform.f = old.b * delta.e + old.d * delta.f + old.f;
 363
 364         Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 365 }
 366
 367 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
 368 {
 369         Debug("Parse node <%s>", root.name());
 370
 371
 372         for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
 373         {
 374                 SVGMatrix transform(parent_transform);
 375                 pugi::xml_attribute attrib_trans = child.attribute("transform");
 376                 if (!attrib_trans.empty())
 377                 {
 378                         ParseSVGTransform(attrib_trans.as_string(), transform);
 379                 }
 380
 381                 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
 382                         || strcmp(child.name(), "group") == 0)
 383                 {
 384
 385                         ParseSVGNode(child, transform);
 386                         continue;
 387                 }
 388                 else if (strcmp(child.name(), "path") == 0)
 389                 {
 390                         string d = child.attribute("d").as_string();
 391                         Debug("Path data attribute is \"%s\"", d.c_str());
 392                         ParseSVGPathData(d, transform);
 393                 }
 394                 else if (strcmp(child.name(), "line") == 0)
 395                 {
 396                         Real x0(child.attribute("x1").as_float());
 397                         Real y0(child.attribute("y1").as_float());
 398                         Real x1(child.attribute("x2").as_float());
 399                         Real y1(child.attribute("y2").as_float());
 400                         TransformXYPair(x0,y0,transform);
 401                         TransformXYPair(x1,y1,transform);
 402                         unsigned index = AddBezierData(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
 403                         Add(BEZIER, Rect(0,0,1,1), index);
 404                 }
 405                 else if (strcmp(child.name(), "rect") == 0)
 406                 {
 407                         Real coords[4];
 408                         const char * attrib_names[] = {"x", "y", "width", "height"};
 409                         for (size_t i = 0; i < 4; ++i)
 410                                 coords[i] = child.attribute(attrib_names[i]).as_float();
 411
 412                         Real x2(coords[0]+coords[2]);
 413                         Real y2(coords[1]+coords[3]);
 414                         TransformXYPair(coords[0],coords[1],transform); // x, y, transform
 415                         TransformXYPair(x2,y2,transform);
 416                         coords[2] = x2 - coords[0];
 417                         coords[3] = y2 - coords[1];
 418
 419                         bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
 420                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
 421                 }
 422                 else if (strcmp(child.name(), "circle") == 0)
 423                 {
 424                         Real cx = child.attribute("cx").as_float();
 425                         Real cy = child.attribute("cy").as_float();
 426                         Real r = child.attribute("r").as_float();
 427
 428                         Real x = (cx - r);
 429                         Real y = (cy - r);
 430                         TransformXYPair(x,y,transform);
 431                         Real w = Real(2)*r*transform.a; // width scales
 432                         Real h = Real(2)*r*transform.d; // height scales
 433
 434
 435                         Rect rect(x,y,w,h);
 436                         Add(CIRCLE_FILLED, rect,0);
 437                         Debug("Added Circle %s", rect.Str().c_str());
 438                 }
 439                 else if (strcmp(child.name(), "text") == 0)
 440                 {
 441                         Real x = child.attribute("x").as_float();
 442                         Real y = child.attribute("y").as_float();
 443                         TransformXYPair(x,y,transform);
 444                         Debug("Add text \"%s\"", child.child_value());
 445                         AddText(child.child_value(), 0.05, x, y);
 446                 }
 447         }
 448 }
 449
 450 /**
 451  * Load an SVG into a rectangle
 452  */
 453 void Document::LoadSVG(const string & filename, const Rect & bounds)
 454 {
 455         using namespace pugi;
 456
 457         xml_document doc_xml;
 458         ifstream input(filename.c_str(), ios_base::in);
 459         xml_parse_result result = doc_xml.load(input);
 460
 461         if (!result)
 462                 Fatal("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 463
 464         Debug("Loaded XML - %s", result.description());
 465
 466         input.close();
 467
 468         SVGMatrix transform = {bounds.w, 0,bounds.x, bounds.h,0,bounds.y};
 469         ParseSVGNode(doc_xml, transform);
 470 }
 471
 472
 473
 474 // Fear the wrath of the tokenizing svg data
 475 // Seriously this isn't really very DOM-like at all is it?
 476 void Document::ParseSVGPathData(const string & d, const SVGMatrix & transform)
 477 {
 478         Real x[4] = {0,0,0,0};
 479         Real y[4] = {0,0,0,0};
 480
 481         string token("");
 482         string command("m");
 483
 484         Real x0(0);
 485         Real y0(0);
 486
 487         unsigned i = 0;
 488         unsigned prev_i = 0;
 489
 490         bool start = false;
 491
 492         static string delims("()[],{}<>;:=LlmMqQzZcC");
 493
 494         while (i < d.size() && GetToken(d, token, i).size() > 0)
 495         {
 496                 if (isalpha(token[0]))
 497                         command = token;
 498                 else
 499                 {
 500                         i = prev_i; // hax
 501                         if(command == "")
 502                                 command = "L";
 503                 }
 504
 505                 bool relative = islower(command[0]);
 506
 507                 if (command == "m" || command == "M")
 508                 {
 509                         //Debug("Construct moveto command");
 510                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) * transform.a;
 511                         assert(GetToken(d,token,i,delims) == ",");
 512                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) * transform.d;
 513
 514                         x[0] = (relative) ? x[0] + dx : dx + transform.e;
 515                         y[0] = (relative) ? y[0] + dy : dy + transform.f;
 516
 517
 518
 519                         //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 520                         command = (command == "m") ? "l" : "L";
 521                 }
 522                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 523                 {
 524                         //Debug("Construct curveto command");
 525                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) * transform.a;
 526                         assert(GetToken(d,token,i,delims) == ",");
 527                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL))*transform.d;
 528
 529                         x[1] = (relative) ? x[0] + dx : dx + transform.e;
 530                         y[1] = (relative) ? y[0] + dy : dy + transform.f;
 531
 532                         dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) *transform.a;
 533                         assert(GetToken(d,token,i,delims) == ",");
 534                         dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) *transform.d;
 535
 536                         x[2] = (relative) ? x[0] + dx : dx + transform.e;
 537                         y[2] = (relative) ? y[0] + dy : dy + transform.f;
 538
 539                         if (command != "q" && command != "Q")
 540                         {
 541                                 dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) *transform.a;
 542                                 assert(GetToken(d,token,i,delims) == ",");
 543                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) *transform.d;
 544                                 x[3] = (relative) ? x[0] + dx : dx + transform.e;
 545                                 y[3] = (relative) ? y[0] + dy : dy + transform.f;
 546                         }
 547                         else
 548                         {
 549                                 x[3] = x[2];
 550                                 y[3] = y[2];
 551                                 Real old_x1(x[1]), old_y1(y[1]);
 552                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 553                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 554                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 555                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 556                         }
 557
 558                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 559                         Add(BEZIER,Rect(0,0,1,1),index);
 560
 561
 562                         //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]));
 563
 564                         x[0] = x[3];
 565                         y[0] = y[3];
 566
 567
 568                 }
 569                 else if (command == "l" || command == "L")
 570                 {
 571                         //Debug("Construct lineto command");
 572
 573                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) *transform.a;
 574                         assert(GetToken(d,token,i,delims) == ",");
 575                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) *transform.d;
 576
 577                         x[1] = (relative) ? x[0] + dx : dx + transform.e;
 578                         y[1] = (relative) ? y[0] + dy : dy + transform.f;
 579
 580                         x[2] = x[1];
 581                         y[2] = y[1];
 582
 583                         x[3] = x[1];
 584                         y[3] = y[1];
 585
 586                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 587                         Add(BEZIER,Rect(0,0,1,1),index);
 588
 589                         //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 590
 591                         x[0] = x[3];
 592                         y[0] = y[3];
 593
 594                 }
 595                 else if (command == "z" || command == "Z")
 596                 {
 597                         //Debug("Construct returnto command");
 598                         x[1] = x0;
 599                         y[1] = y0;
 600                         x[2] = x0;
 601                         y[2] = y0;
 602                         x[3] = x0;
 603                         y[3] = y0;
 604
 605                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 606                         Add(BEZIER,Rect(0,0,1,1),index);
 607
 608                         //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 609
 610                         x[0] = x[3];
 611                         y[0] = y[3];
 612                         command = "m";
 613                 }
 614                 else
 615                 {
 616                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 617                         command = "m";
 618                 }
 619
 620                 if (!start)
 621                 {
 622                         x0 = x[0];
 623                         y0 = y[0];
 624                         start = true;
 625                 }
 626                 prev_i = i;
 627         }
 628 }
 629
 630 void Document::SetFont(const string & font_filename)
 631 {
 632         if (m_font_data != NULL)
 633         {
 634                 free(m_font_data);
 635         }
 636
 637         FILE *font_file = fopen("DejaVuSansMono.ttf", "rb");
 638         fseek(font_file, 0, SEEK_END);
 639         size_t font_file_size = ftell(font_file);
 640         fseek(font_file, 0, SEEK_SET);
 641         m_font_data = (unsigned char*)malloc(font_file_size);
 642         size_t read = fread(m_font_data, 1, font_file_size, font_file);
 643         if (read != font_file_size)
 644         {
 645                 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
 646         }
 647         fclose(font_file);
 648         stbtt_InitFont(&m_font, m_font_data, 0);
 649 }
 650
 651 void Document::AddText(const string & text, Real scale, Real x, Real y)
 652 {
 653         if (m_font_data == NULL)
 654         {
 655                 Warn("No font loaded");
 656                 return;
 657         }
 658
 659         float font_scale = stbtt_ScaleForPixelHeight(&m_font, scale);
 660         Real x0(x);
 661         //Real y0(y);
 662         for (unsigned i = 0; i < text.size(); ++i)
 663         {
 664                 if (text[i] == '\n')
 665                 {
 666                         y += 0.5*scale;
 667                         x = x0;
 668                 }
 669                 if (!isprint(text[i]))
 670                         continue;
 671
 672                 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
 673                 x += 0.5*scale;
 674         }
 675 }
 676
 677 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 678 {
 679         int glyph_index = stbtt_FindGlyphIndex(font, character);
 680
 681         // Check if there is actully a glyph to render.
 682         if (stbtt_IsGlyphEmpty(font, glyph_index))
 683         {
 684                 return;
 685         }
 686
 687         stbtt_vertex *instructions;
 688         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 689
 690         Real current_x(0), current_y(0);
 691
 692         for (int i = 0; i < num_instructions; ++i)
 693         {
 694                 // TTF uses 16-bit signed ints for coordinates:
 695                 // with the y-axis inverted compared to us.
 696                 // Convert and scale any data.
 697                 Real inst_x = Real(instructions[i].x)*scale;
 698                 Real inst_y = Real(instructions[i].y)*-scale;
 699                 Real inst_cx = Real(instructions[i].cx)*scale;
 700                 Real inst_cy = Real(instructions[i].cy)*-scale;
 701                 Real old_x(current_x), old_y(current_y);
 702                 current_x = inst_x;
 703                 current_y = inst_y;
 704                 unsigned bezier_index;
 705                 switch(instructions[i].type)
 706                 {
 707                 // Move To
 708                 case STBTT_vmove:
 709                         break;
 710                 // Line To
 711                 case STBTT_vline:
 712                         bezier_index = AddBezierData(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));
 713                         Add(BEZIER,Rect(0,0,1,1),bezier_index);
 714                         break;
 715                 // Quadratic Bezier To:
 716                 case STBTT_vcurve:
 717                         // Quadratic -> Cubic:
 718                         // - Endpoints are the same.
 719                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
 720                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
 721                         bezier_index = AddBezierData(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,
 722                                                 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));
 723                         Add(BEZIER,Rect(0,0,1,1),bezier_index);
 724                         break;
 725                 }
 726         }
 727
 728         stbtt_FreeShape(font, instructions);
 729 }