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         default:
 134                 Debug("Adding %s -> %s", m_objects.bounds[object_id].Str().c_str(), TransformToQuadChild(m_objects.bounds[object_id], type).Str().c_str());
 135                 m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 136                 m_objects.types.push_back(m_objects.types[object_id]);
 137                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 138                 return 1;
 139         }
 140         return 0;
 141 }
 142 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 143 {
 144         QuadTreeIndex new_index = m_quadtree.nodes.size();
 145         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 146
 147         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 148         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 149         {
 150                 if (IntersectsQuadChild(m_objects.bounds[i], type))
 151                 {
 152                         m_count += ClipObjectToQuadChild(i, type);
 153                 }
 154         }
 155         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 156         switch (type)
 157         {
 158                 case QTC_TOP_LEFT:
 159                         m_quadtree.nodes[parent].top_left = new_index;
 160                         break;
 161                 case QTC_TOP_RIGHT:
 162                         m_quadtree.nodes[parent].top_right = new_index;
 163                         break;
 164                 case QTC_BOTTOM_LEFT:
 165                         m_quadtree.nodes[parent].bottom_left = new_index;
 166                         break;
 167                 case QTC_BOTTOM_RIGHT:
 168                         m_quadtree.nodes[parent].bottom_right = new_index;
 169                         break;
 170                 default:
 171                         Fatal("Tried to add a QuadTree child of invalid type!");
 172         }
 173         return new_index;
 174 }
 175
 176 // Reparent a quadtree node, making it the "type" child of a new node.
 177 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 178 {
 179         QuadTreeIndex new_index = m_quadtree.nodes.size();
 180         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
 181
 182         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 183         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 184         {
 185                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 186                 m_objects.types.push_back(m_objects.types[i]);
 187                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 188                 m_count++;
 189         }
 190         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 191         switch (type)
 192         {
 193                 case QTC_TOP_LEFT:
 194                         m_quadtree.nodes[new_index].top_left = child;
 195                         break;
 196                 case QTC_TOP_RIGHT:
 197                         m_quadtree.nodes[new_index].top_right = child;
 198                         break;
 199                 case QTC_BOTTOM_LEFT:
 200                         m_quadtree.nodes[new_index].bottom_left = child;
 201                         break;
 202                 case QTC_BOTTOM_RIGHT:
 203                         m_quadtree.nodes[new_index].bottom_right = child;
 204                         break;
 205                 default:
 206                         Fatal("Tried to add a QuadTree child of invalid type!");
 207         }
 208         return new_index;
 209 }
 210
 211 #endif
 212
 213 void Document::Load(const string & filename)
 214 {
 215         m_objects.bounds.clear();
 216         m_count = 0;
 217         if (filename == "")
 218         {
 219                 Debug("Loaded empty document.");
 220                 return;
 221         }
 222         Debug("Loading document from file \"%s\"", filename.c_str());
 223         FILE * file = fopen(filename.c_str(), "r");
 224         if (file == NULL)
 225                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 226
 227         size_t read;
 228
 229         DocChunkTypes chunk_type;
 230         uint32_t chunk_size;
 231         while (ReadChunkHeader(file, chunk_type, chunk_size))
 232         {
 233                 switch(chunk_type)
 234                 {
 235                 case CT_NUMOBJS:
 236                         read = fread(&m_count, sizeof(m_count), 1, file);
 237                         if (read != 1)
 238                                 Fatal("Failed to read number of objects!");
 239                         Debug("Number of objects: %u", ObjectCount());
 240                         break;
 241                 case CT_OBJTYPES:
 242                         Debug("Object types...");
 243                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 244                         break;
 245                 case CT_OBJBOUNDS:
 246                         Debug("Object bounds...");
 247                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 248                         break;
 249                 case CT_OBJINDICES:
 250                         Debug("Object data indices...");
 251                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 252                         break;
 253                 case CT_OBJBEZIERS:
 254                         Debug("Bezier data...");
 255                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 256                         break;
 257                 }
 258         }
 259         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 260 #ifndef QUADTREE_DISABLED
 261         if (m_quadtree.root_id == QUADTREE_EMPTY)
 262         {
 263                 GenBaseQuadtree();
 264         }
 265 #endif
 266 }
 267
 268 void Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 269 {
 270         m_objects.types.push_back(type);
 271         m_objects.bounds.push_back(bounds);
 272         m_objects.data_indices.push_back(data_index);
 273         ++m_count; // Why can't we just use the size of types or something?
 274 }
 275
 276 unsigned Document::AddBezierData(const Bezier & bezier)
 277 {
 278         m_objects.beziers.push_back(bezier);
 279         return m_objects.beziers.size()-1;
 280 }
 281
 282
 283 void Document::DebugDumpObjects()
 284 {
 285         Debug("Objects for Document %p are:", this);
 286         for (unsigned id = 0; id < ObjectCount(); ++id)
 287         {
 288                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 289         }
 290 }
 291
 292 bool Document::operator==(const Document & equ) const
 293 {
 294         return (ObjectCount() == equ.ObjectCount()
 295                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 296                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 297                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 298 }
 299
 300
 301
 302 // Behold my amazing tokenizing abilities
 303 static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
 304 {
 305         token.clear();
 306         while (i < d.size() && iswspace(d[i]))
 307         {
 308                 ++i;
 309         }
 310
 311         while (i < d.size())
 312         {
 313                 if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
 314                 {
 315                         if (token.size() == 0 && !iswspace(d[i]))
 316                         {
 317                                 token += d[i++];
 318                         }
 319                         break;
 320                 }
 321                 token += d[i++];
 322         }
 323         //Debug("Got token \"%s\"", token.c_str());
 324         return token;
 325 }
 326
 327 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
 328 {
 329         string token("");
 330         while (GetToken(d, token, i, delims) == ",");
 331         x = strtod(token.c_str(),NULL);
 332         if (GetToken(d, token, i, delims) != ",")
 333         {
 334                 Fatal("Expected \",\" seperating x,y pair");
 335         }
 336         y = strtod(GetToken(d, token, i, delims).c_str(),NULL);
 337 }
 338
 339 static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
 340 {
 341         Real x0(x);
 342         x = transform.a * x + transform.c * y + transform.e;
 343         y = transform.b * x0 + transform.d * y + transform.f;
 344 }
 345
 346 void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
 347 {
 348         Debug("Parsing transform %s", s.c_str());
 349         string token;
 350         string command;
 351         unsigned i = 0;
 352
 353         while (i < s.size())
 354         {
 355                 GetToken(s, command, i);
 356                 if (command == "," || command == "" || command == ":")
 357                 {
 358                         if (i < s.size())
 359                                 GetToken(s, command, i);
 360                         else
 361                                 return;
 362                 }
 363                 Debug("Token is \"%s\"", command.c_str());
 364
 365                 SVGMatrix delta = {1,0,0,0,1,0};
 366
 367
 368                 assert(GetToken(s,token, i) == "(");
 369                 if (command == "translate")
 370                 {
 371                         GetXYPair(s, delta.e, delta.f, i);
 372                         assert(GetToken(s,token, i) == ")");
 373                 }
 374                 else if (command == "matrix")
 375                 {
 376                         GetXYPair(s, delta.a, delta.b,i);
 377                         GetXYPair(s, delta.c, delta.d,i);
 378                         GetXYPair(s, delta.e, delta.f,i);
 379                         assert(GetToken(s,token, i) == ")");
 380                 }
 381                 else if (command == "scale")
 382                 {
 383                         delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
 384                         GetToken(s, token, i);
 385                         if (token == ",")
 386                         {
 387                                 delta.d = (strtod(GetToken(s,token,i).c_str(), NULL));
 388                                 assert(GetToken(s, token, i) == ")");
 389                         }
 390                         else
 391                         {
 392                                 delta.d = delta.a;
 393                                 assert(token == ")");
 394                         }
 395
 396                 }
 397                 else
 398                 {
 399                         Warn("Unrecognised transform \"%s\", using identity", command.c_str());
 400                 }
 401
 402                 Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 403                 Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
 404
 405                 SVGMatrix old(transform);
 406                 transform.a = old.a * delta.a + old.c * delta.b;
 407                 transform.c = old.a * delta.c + old.c * delta.d;
 408                 transform.e = old.a * delta.e + old.c * delta.f + old.e;
 409
 410                 transform.b = old.b * delta.a + old.d * delta.b;
 411                 transform.d = old.b * delta.c + old.d * delta.d;
 412                 transform.f = old.b * delta.e + old.d * delta.f + old.f;
 413
 414                 Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 415         }
 416 }
 417
 418 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
 419 {
 420         Debug("Parse node <%s>", root.name());
 421
 422
 423         for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
 424         {
 425                 SVGMatrix transform(parent_transform);
 426                 pugi::xml_attribute attrib_trans = child.attribute("transform");
 427                 if (!attrib_trans.empty())
 428                 {
 429                         ParseSVGTransform(attrib_trans.as_string(), transform);
 430                 }
 431
 432                 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
 433                         || strcmp(child.name(), "group") == 0)
 434                 {
 435
 436                         ParseSVGNode(child, transform);
 437                         continue;
 438                 }
 439                 else if (strcmp(child.name(), "path") == 0)
 440                 {
 441                         string d = child.attribute("d").as_string();
 442                         Debug("Path data attribute is \"%s\"", d.c_str());
 443                         ParseSVGPathData(d, transform);
 444                 }
 445                 else if (strcmp(child.name(), "line") == 0)
 446                 {
 447                         Real x0(child.attribute("x1").as_float());
 448                         Real y0(child.attribute("y1").as_float());
 449                         Real x1(child.attribute("x2").as_float());
 450                         Real y1(child.attribute("y2").as_float());
 451                         TransformXYPair(x0,y0,transform);
 452                         TransformXYPair(x1,y1,transform);
 453                         unsigned index = AddBezierData(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
 454                         Add(BEZIER, Rect(0,0,1,1), index);
 455                 }
 456                 else if (strcmp(child.name(), "rect") == 0)
 457                 {
 458                         Real coords[4];
 459                         const char * attrib_names[] = {"x", "y", "width", "height"};
 460                         for (size_t i = 0; i < 4; ++i)
 461                                 coords[i] = child.attribute(attrib_names[i]).as_float();
 462
 463                         Real x2(coords[0]+coords[2]);
 464                         Real y2(coords[1]+coords[3]);
 465                         TransformXYPair(coords[0],coords[1],transform); // x, y, transform
 466                         TransformXYPair(x2,y2,transform);
 467                         coords[2] = x2 - coords[0];
 468                         coords[3] = y2 - coords[1];
 469
 470                         bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
 471                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
 472                 }
 473                 else if (strcmp(child.name(), "circle") == 0)
 474                 {
 475                         Real cx = child.attribute("cx").as_float();
 476                         Real cy = child.attribute("cy").as_float();
 477                         Real r = child.attribute("r").as_float();
 478
 479                         Real x = (cx - r);
 480                         Real y = (cy - r);
 481                         TransformXYPair(x,y,transform);
 482                         Real w = Real(2)*r*transform.a; // width scales
 483                         Real h = Real(2)*r*transform.d; // height scales
 484
 485
 486                         Rect rect(x,y,w,h);
 487                         Add(CIRCLE_FILLED, rect,0);
 488                         Debug("Added Circle %s", rect.Str().c_str());
 489                 }
 490                 else if (strcmp(child.name(), "text") == 0)
 491                 {
 492                         Real x = child.attribute("x").as_float();
 493                         Real y = child.attribute("y").as_float();
 494                         TransformXYPair(x,y,transform);
 495                         Debug("Add text \"%s\"", child.child_value());
 496                         AddText(child.child_value(), 0.05, x, y);
 497                 }
 498         }
 499 }
 500
 501 /**
 502  * Load an SVG into a rectangle
 503  */
 504 void Document::LoadSVG(const string & filename, const Rect & bounds)
 505 {
 506         using namespace pugi;
 507
 508         xml_document doc_xml;
 509         ifstream input(filename.c_str(), ios_base::in);
 510         xml_parse_result result = doc_xml.load(input);
 511
 512         if (!result)
 513                 Fatal("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 514
 515         Debug("Loaded XML - %s", result.description());
 516
 517         input.close();
 518                                                 // a c e, b d f
 519         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 520         ParseSVGNode(doc_xml, transform);
 521 }
 522
 523
 524
 525 // Fear the wrath of the tokenizing svg data
 526 // Seriously this isn't really very DOM-like at all is it?
 527 void Document::ParseSVGPathData(const string & d, const SVGMatrix & transform)
 528 {
 529         Real x[4] = {0,0,0,0};
 530         Real y[4] = {0,0,0,0};
 531
 532         string token("");
 533         string command("m");
 534
 535         Real x0(0);
 536         Real y0(0);
 537
 538         unsigned i = 0;
 539         unsigned prev_i = 0;
 540
 541         bool start = false;
 542
 543         static string delims("()[],{}<>;:=LlmMqQzZcC");
 544
 545         while (i < d.size() && GetToken(d, token, i).size() > 0)
 546         {
 547                 if (isalpha(token[0]))
 548                         command = token;
 549                 else
 550                 {
 551                         i = prev_i; // hax
 552                         if(command == "")
 553                                 command = "L";
 554                 }
 555
 556                 bool relative = islower(command[0]);
 557
 558                 if (command == "m" || command == "M")
 559                 {
 560                         //Debug("Construct moveto command");
 561                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 562                         assert(GetToken(d,token,i,delims) == ",");
 563                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 564
 565                         x[0] = (relative) ? x[0] + dx : dx;
 566                         y[0] = (relative) ? y[0] + dy : dy;
 567
 568                         //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 569                         command = (command == "m") ? "l" : "L";
 570                 }
 571                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 572                 {
 573                         //Debug("Construct curveto command");
 574                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 575                         assert(GetToken(d,token,i,delims) == ",");
 576                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 577
 578                         x[1] = (relative) ? x[0] + dx : dx;
 579                         y[1] = (relative) ? y[0] + dy : dy;
 580
 581                         dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 582                         assert(GetToken(d,token,i,delims) == ",");
 583                         dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 584
 585                         x[2] = (relative) ? x[0] + dx : dx;
 586                         y[2] = (relative) ? y[0] + dy : dy;
 587
 588                         if (command != "q" && command != "Q")
 589                         {
 590                                 dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 591                                 assert(GetToken(d,token,i,delims) == ",");
 592                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 593                                 x[3] = (relative) ? x[0] + dx : dx;
 594                                 y[3] = (relative) ? y[0] + dy : dy;
 595                         }
 596                         else
 597                         {
 598                                 x[3] = x[2];
 599                                 y[3] = y[2];
 600                                 Real old_x1(x[1]), old_y1(y[1]);
 601                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 602                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 603                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 604                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 605                         }
 606
 607                         Real x3(x[3]);
 608                         Real y3(y[3]);
 609                         for (int j = 0; j < 4; ++j)
 610                                 TransformXYPair(x[j],y[j], transform);
 611
 612                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 613                         Add(BEZIER,Rect(0,0,1,1),index);
 614
 615
 616                         //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]));
 617
 618                         x[0] = x3;
 619                         y[0] = y3;
 620
 621
 622                 }
 623                 else if (command == "l" || command == "L")
 624                 {
 625                         Debug("Construct lineto command, relative %d", relative);
 626
 627                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 628                         assert(GetToken(d,token,i,delims) == ",");
 629                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 630
 631                         x[1] = (relative) ? x[0] + dx : dx;
 632                         y[1] = (relative) ? y[0] + dy : dy;
 633
 634                         Real x1(x[1]);
 635                         Real y1(y[1]);
 636
 637                         TransformXYPair(x[0],y[0],transform);
 638                         TransformXYPair(x[1],y[1],transform);
 639
 640
 641                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
 642                         Add(BEZIER,Rect(0,0,1,1),index);
 643
 644                         //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 645
 646                         x[0] = x1;
 647                         y[0] = y1;
 648
 649                 }
 650                 else if (command == "z" || command == "Z")
 651                 {
 652                         //Debug("Construct returnto command");
 653                         x[1] = x0;
 654                         y[1] = y0;
 655                         x[2] = x0;
 656                         y[2] = y0;
 657                         x[3] = x0;
 658                         y[3] = y0;
 659
 660                         Real x3(x[3]);
 661                         Real y3(y[3]);
 662                         for (int j = 0; j < 4; ++j)
 663                                 TransformXYPair(x[j],y[j], transform);
 664
 665                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 666                         Add(BEZIER,Rect(0,0,1,1),index);
 667
 668                         //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 669
 670                         x[0] = x3;
 671                         y[0] = y3;
 672                         command = "m";
 673                 }
 674                 else
 675                 {
 676                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 677                         command = "m";
 678                 }
 679
 680                 if (!start)
 681                 {
 682                         x0 = x[0];
 683                         y0 = y[0];
 684                         start = true;
 685                 }
 686                 prev_i = i;
 687         }
 688 }
 689
 690 void Document::SetFont(const string & font_filename)
 691 {
 692         if (m_font_data != NULL)
 693         {
 694                 free(m_font_data);
 695         }
 696
 697         FILE *font_file = fopen("DejaVuSansMono.ttf", "rb");
 698         fseek(font_file, 0, SEEK_END);
 699         size_t font_file_size = ftell(font_file);
 700         fseek(font_file, 0, SEEK_SET);
 701         m_font_data = (unsigned char*)malloc(font_file_size);
 702         size_t read = fread(m_font_data, 1, font_file_size, font_file);
 703         if (read != font_file_size)
 704         {
 705                 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
 706         }
 707         fclose(font_file);
 708         stbtt_InitFont(&m_font, m_font_data, 0);
 709 }
 710
 711 void Document::AddText(const string & text, Real scale, Real x, Real y)
 712 {
 713         if (m_font_data == NULL)
 714         {
 715                 Warn("No font loaded");
 716                 return;
 717         }
 718
 719         float font_scale = stbtt_ScaleForPixelHeight(&m_font, scale);
 720         Real x0(x);
 721         //Real y0(y);
 722         int ascent = 0, descent = 0, line_gap = 0;
 723         stbtt_GetFontVMetrics(&m_font, &ascent, &descent, &line_gap);
 724         Real y_advance = Real(font_scale) * Real(ascent - descent + line_gap);
 725         for (unsigned i = 0; i < text.size(); ++i)
 726         {
 727                 if (text[i] == '\n')
 728                 {
 729                         y += y_advance;
 730                         x = x0;
 731                 }
 732                 if (!isprint(text[i]))
 733                         continue;
 734
 735                 int advance_width = 0, left_side_bearing = 0, kerning = 0;
 736                 stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
 737                 if (i > 1)
 738                 {
 739                         kerning = stbtt_GetCodepointKernAdvance(&m_font, text[i-1], text[i]);
 740                 }
 741                 x += Real(font_scale) * Real(left_side_bearing + kerning);
 742                 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
 743                 x += Real(font_scale) * Real(advance_width);
 744         }
 745 }
 746
 747 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 748 {
 749         int glyph_index = stbtt_FindGlyphIndex(font, character);
 750
 751         // Check if there is actully a glyph to render.
 752         if (stbtt_IsGlyphEmpty(font, glyph_index))
 753         {
 754                 return;
 755         }
 756
 757         stbtt_vertex *instructions;
 758         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 759
 760         Real current_x(0), current_y(0);
 761
 762         for (int i = 0; i < num_instructions; ++i)
 763         {
 764                 // TTF uses 16-bit signed ints for coordinates:
 765                 // with the y-axis inverted compared to us.
 766                 // Convert and scale any data.
 767                 Real inst_x = Real(instructions[i].x)*scale;
 768                 Real inst_y = Real(instructions[i].y)*-scale;
 769                 Real inst_cx = Real(instructions[i].cx)*scale;
 770                 Real inst_cy = Real(instructions[i].cy)*-scale;
 771                 Real old_x(current_x), old_y(current_y);
 772                 current_x = inst_x;
 773                 current_y = inst_y;
 774                 unsigned bezier_index;
 775                 switch(instructions[i].type)
 776                 {
 777                 // Move To
 778                 case STBTT_vmove:
 779                         break;
 780                 // Line To
 781                 case STBTT_vline:
 782                         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));
 783                         Add(BEZIER,Rect(0,0,1,1),bezier_index);
 784                         break;
 785                 // Quadratic Bezier To:
 786                 case STBTT_vcurve:
 787                         // Quadratic -> Cubic:
 788                         // - Endpoints are the same.
 789                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
 790                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
 791                         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,
 792                                                 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));
 793                         Add(BEZIER,Rect(0,0,1,1),bezier_index);
 794                         break;
 795                 }
 796         }
 797
 798         stbtt_FreeShape(font, instructions);
 799 }