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 (IntersectsQuadChild(m_objects.bounds[i], type))
 111                 {
 112                         Debug("Adding %s -> %s", m_objects.bounds[i].Str().c_str(), TransformToQuadChild(m_objects.bounds[i], type).Str().c_str());
 113                         m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[i], type));
 114                         m_objects.types.push_back(m_objects.types[i]);
 115                         m_objects.data_indices.push_back(m_objects.data_indices[i]);
 116                         m_count++;
 117                 }
 118         }
 119         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 120         switch (type)
 121         {
 122                 case QTC_TOP_LEFT:
 123                         m_quadtree.nodes[parent].top_left = new_index;
 124                         break;
 125                 case QTC_TOP_RIGHT:
 126                         m_quadtree.nodes[parent].top_right = new_index;
 127                         break;
 128                 case QTC_BOTTOM_LEFT:
 129                         m_quadtree.nodes[parent].bottom_left = new_index;
 130                         break;
 131                 case QTC_BOTTOM_RIGHT:
 132                         m_quadtree.nodes[parent].bottom_right = new_index;
 133                         break;
 134                 default:
 135                         Fatal("Tried to add a QuadTree child of invalid type!");
 136         }
 137         return new_index;
 138 }
 139
 140 // Reparent a quadtree node, making it the "type" child of a new node.
 141 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 142 {
 143         QuadTreeIndex new_index = m_quadtree.nodes.size();
 144         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
 145
 146         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 147         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 148         {
 149                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 150                 m_objects.types.push_back(m_objects.types[i]);
 151                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 152                 m_count++;
 153         }
 154         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 155         switch (type)
 156         {
 157                 case QTC_TOP_LEFT:
 158                         m_quadtree.nodes[new_index].top_left = child;
 159                         break;
 160                 case QTC_TOP_RIGHT:
 161                         m_quadtree.nodes[new_index].top_right = child;
 162                         break;
 163                 case QTC_BOTTOM_LEFT:
 164                         m_quadtree.nodes[new_index].bottom_left = child;
 165                         break;
 166                 case QTC_BOTTOM_RIGHT:
 167                         m_quadtree.nodes[new_index].bottom_right = child;
 168                         break;
 169                 default:
 170                         Fatal("Tried to add a QuadTree child of invalid type!");
 171         }
 172         return new_index;
 173 }
 174
 175 #endif
 176
 177 void Document::Load(const string & filename)
 178 {
 179         m_objects.bounds.clear();
 180         m_count = 0;
 181         if (filename == "")
 182         {
 183                 Debug("Loaded empty document.");
 184                 return;
 185         }
 186         Debug("Loading document from file \"%s\"", filename.c_str());
 187         FILE * file = fopen(filename.c_str(), "r");
 188         if (file == NULL)
 189                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 190
 191         size_t read;
 192
 193         DocChunkTypes chunk_type;
 194         uint32_t chunk_size;
 195         while (ReadChunkHeader(file, chunk_type, chunk_size))
 196         {
 197                 switch(chunk_type)
 198                 {
 199                 case CT_NUMOBJS:
 200                         read = fread(&m_count, sizeof(m_count), 1, file);
 201                         if (read != 1)
 202                                 Fatal("Failed to read number of objects!");
 203                         Debug("Number of objects: %u", ObjectCount());
 204                         break;
 205                 case CT_OBJTYPES:
 206                         Debug("Object types...");
 207                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 208                         break;
 209                 case CT_OBJBOUNDS:
 210                         Debug("Object bounds...");
 211                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 212                         break;
 213                 case CT_OBJINDICES:
 214                         Debug("Object data indices...");
 215                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 216                         break;
 217                 case CT_OBJBEZIERS:
 218                         Debug("Bezier data...");
 219                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 220                         break;
 221                 }
 222         }
 223         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 224 #ifndef QUADTREE_DISABLED
 225         if (m_quadtree.root_id == QUADTREE_EMPTY)
 226         {
 227                 GenBaseQuadtree();
 228         }
 229 #endif
 230 }
 231
 232 void Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 233 {
 234         m_objects.types.push_back(type);
 235         m_objects.bounds.push_back(bounds);
 236         m_objects.data_indices.push_back(data_index);
 237         ++m_count; // Why can't we just use the size of types or something?
 238 }
 239
 240 unsigned Document::AddBezierData(const Bezier & bezier)
 241 {
 242         m_objects.beziers.push_back(bezier);
 243         return m_objects.beziers.size()-1;
 244 }
 245
 246
 247 void Document::DebugDumpObjects()
 248 {
 249         Debug("Objects for Document %p are:", this);
 250         for (unsigned id = 0; id < ObjectCount(); ++id)
 251         {
 252                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 253         }
 254 }
 255
 256 bool Document::operator==(const Document & equ) const
 257 {
 258         return (ObjectCount() == equ.ObjectCount()
 259                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 260                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 261                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 262 }
 263
 264
 265
 266 // Behold my amazing tokenizing abilities
 267 static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
 268 {
 269         token.clear();
 270         while (i < d.size() && iswspace(d[i]))
 271         {
 272                 ++i;
 273         }
 274
 275         while (i < d.size())
 276         {
 277                 if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
 278                 {
 279                         if (token.size() == 0 && !iswspace(d[i]))
 280                         {
 281                                 token += d[i++];
 282                         }
 283                         break;
 284                 }
 285                 token += d[i++];
 286         }
 287         //Debug("Got token \"%s\"", token.c_str());
 288         return token;
 289 }
 290
 291 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
 292 {
 293         string token("");
 294         while (GetToken(d, token, i, delims) == ",");
 295         x = strtod(token.c_str(),NULL);
 296         if (GetToken(d, token, i, delims) != ",")
 297         {
 298                 Fatal("Expected \",\" seperating x,y pair");
 299         }
 300         y = strtod(GetToken(d, token, i, delims).c_str(),NULL);
 301 }
 302
 303 static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
 304 {
 305         Real x0(x);
 306         x = transform.a * x + transform.c * y + transform.e;
 307         y = transform.b * x0 + transform.d * y + transform.f;
 308 }
 309
 310 void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
 311 {
 312         Debug("Parsing transform %s", s.c_str());
 313         string token;
 314         string command;
 315         unsigned i = 0;
 316
 317         while (i < s.size())
 318         {
 319                 GetToken(s, command, i);
 320                 if (command == "," || command == "" || command == ":")
 321                 {
 322                         if (i < s.size())
 323                                 GetToken(s, command, i);
 324                         else
 325                                 return;
 326                 }
 327                 Debug("Token is \"%s\"", command.c_str());
 328
 329                 SVGMatrix delta = {1,0,0,0,1,0};
 330
 331
 332                 assert(GetToken(s,token, i) == "(");
 333                 if (command == "translate")
 334                 {
 335                         GetXYPair(s, delta.e, delta.f, i);
 336                         assert(GetToken(s,token, i) == ")");
 337                 }
 338                 else if (command == "matrix")
 339                 {
 340                         GetXYPair(s, delta.a, delta.b,i);
 341                         GetXYPair(s, delta.c, delta.d,i);
 342                         GetXYPair(s, delta.e, delta.f,i);
 343                         assert(GetToken(s,token, i) == ")");
 344                 }
 345                 else if (command == "scale")
 346                 {
 347                         delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
 348                         GetToken(s, token, i);
 349                         if (token == ",")
 350                         {
 351                                 delta.d = (strtod(GetToken(s,token,i).c_str(), NULL));
 352                                 assert(GetToken(s, token, i) == ")");
 353                         }
 354                         else
 355                         {
 356                                 delta.d = delta.a;
 357                                 assert(token == ")");
 358                         }
 359
 360                 }
 361                 else
 362                 {
 363                         Warn("Unrecognised transform \"%s\", using identity", command.c_str());
 364                 }
 365
 366                 Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 367                 Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
 368
 369                 SVGMatrix old(transform);
 370                 transform.a = old.a * delta.a + old.c * delta.b;
 371                 transform.c = old.a * delta.c + old.c * delta.d;
 372                 transform.e = old.a * delta.e + old.c * delta.f + old.e;
 373
 374                 transform.b = old.b * delta.a + old.d * delta.b;
 375                 transform.d = old.b * delta.c + old.d * delta.d;
 376                 transform.f = old.b * delta.e + old.d * delta.f + old.f;
 377
 378                 Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 379         }
 380 }
 381
 382 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
 383 {
 384         Debug("Parse node <%s>", root.name());
 385
 386
 387         for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
 388         {
 389                 SVGMatrix transform(parent_transform);
 390                 pugi::xml_attribute attrib_trans = child.attribute("transform");
 391                 if (!attrib_trans.empty())
 392                 {
 393                         ParseSVGTransform(attrib_trans.as_string(), transform);
 394                 }
 395
 396                 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
 397                         || strcmp(child.name(), "group") == 0)
 398                 {
 399
 400                         ParseSVGNode(child, transform);
 401                         continue;
 402                 }
 403                 else if (strcmp(child.name(), "path") == 0)
 404                 {
 405                         string d = child.attribute("d").as_string();
 406                         Debug("Path data attribute is \"%s\"", d.c_str());
 407                         ParseSVGPathData(d, transform);
 408                 }
 409                 else if (strcmp(child.name(), "line") == 0)
 410                 {
 411                         Real x0(child.attribute("x1").as_float());
 412                         Real y0(child.attribute("y1").as_float());
 413                         Real x1(child.attribute("x2").as_float());
 414                         Real y1(child.attribute("y2").as_float());
 415                         TransformXYPair(x0,y0,transform);
 416                         TransformXYPair(x1,y1,transform);
 417                         unsigned index = AddBezierData(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
 418                         Add(BEZIER, Rect(0,0,1,1), index);
 419                 }
 420                 else if (strcmp(child.name(), "rect") == 0)
 421                 {
 422                         Real coords[4];
 423                         const char * attrib_names[] = {"x", "y", "width", "height"};
 424                         for (size_t i = 0; i < 4; ++i)
 425                                 coords[i] = child.attribute(attrib_names[i]).as_float();
 426
 427                         Real x2(coords[0]+coords[2]);
 428                         Real y2(coords[1]+coords[3]);
 429                         TransformXYPair(coords[0],coords[1],transform); // x, y, transform
 430                         TransformXYPair(x2,y2,transform);
 431                         coords[2] = x2 - coords[0];
 432                         coords[3] = y2 - coords[1];
 433
 434                         bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
 435                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
 436                 }
 437                 else if (strcmp(child.name(), "circle") == 0)
 438                 {
 439                         Real cx = child.attribute("cx").as_float();
 440                         Real cy = child.attribute("cy").as_float();
 441                         Real r = child.attribute("r").as_float();
 442
 443                         Real x = (cx - r);
 444                         Real y = (cy - r);
 445                         TransformXYPair(x,y,transform);
 446                         Real w = Real(2)*r*transform.a; // width scales
 447                         Real h = Real(2)*r*transform.d; // height scales
 448
 449
 450                         Rect rect(x,y,w,h);
 451                         Add(CIRCLE_FILLED, rect,0);
 452                         Debug("Added Circle %s", rect.Str().c_str());
 453                 }
 454                 else if (strcmp(child.name(), "text") == 0)
 455                 {
 456                         Real x = child.attribute("x").as_float();
 457                         Real y = child.attribute("y").as_float();
 458                         TransformXYPair(x,y,transform);
 459                         Debug("Add text \"%s\"", child.child_value());
 460                         AddText(child.child_value(), 0.05, x, y);
 461                 }
 462         }
 463 }
 464
 465 /**
 466  * Load an SVG into a rectangle
 467  */
 468 void Document::LoadSVG(const string & filename, const Rect & bounds)
 469 {
 470         using namespace pugi;
 471
 472         xml_document doc_xml;
 473         ifstream input(filename.c_str(), ios_base::in);
 474         xml_parse_result result = doc_xml.load(input);
 475
 476         if (!result)
 477                 Fatal("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 478
 479         Debug("Loaded XML - %s", result.description());
 480
 481         input.close();
 482                                                 // a c e, b d f
 483         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 484         ParseSVGNode(doc_xml, transform);
 485 }
 486
 487
 488
 489 // Fear the wrath of the tokenizing svg data
 490 // Seriously this isn't really very DOM-like at all is it?
 491 void Document::ParseSVGPathData(const string & d, const SVGMatrix & transform)
 492 {
 493         Real x[4] = {0,0,0,0};
 494         Real y[4] = {0,0,0,0};
 495
 496         string token("");
 497         string command("m");
 498
 499         Real x0(0);
 500         Real y0(0);
 501
 502         unsigned i = 0;
 503         unsigned prev_i = 0;
 504
 505         bool start = false;
 506
 507         static string delims("()[],{}<>;:=LlmMqQzZcC");
 508
 509         while (i < d.size() && GetToken(d, token, i).size() > 0)
 510         {
 511                 if (isalpha(token[0]))
 512                         command = token;
 513                 else
 514                 {
 515                         i = prev_i; // hax
 516                         if(command == "")
 517                                 command = "L";
 518                 }
 519
 520                 bool relative = islower(command[0]);
 521
 522                 if (command == "m" || command == "M")
 523                 {
 524                         //Debug("Construct moveto command");
 525                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 526                         assert(GetToken(d,token,i,delims) == ",");
 527                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 528
 529                         x[0] = (relative) ? x[0] + dx : dx;
 530                         y[0] = (relative) ? y[0] + dy : dy;
 531
 532                         //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 533                         command = (command == "m") ? "l" : "L";
 534                 }
 535                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 536                 {
 537                         //Debug("Construct curveto command");
 538                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 539                         assert(GetToken(d,token,i,delims) == ",");
 540                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 541
 542                         x[1] = (relative) ? x[0] + dx : dx;
 543                         y[1] = (relative) ? y[0] + dy : dy;
 544
 545                         dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 546                         assert(GetToken(d,token,i,delims) == ",");
 547                         dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 548
 549                         x[2] = (relative) ? x[0] + dx : dx;
 550                         y[2] = (relative) ? y[0] + dy : dy;
 551
 552                         if (command != "q" && command != "Q")
 553                         {
 554                                 dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 555                                 assert(GetToken(d,token,i,delims) == ",");
 556                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 557                                 x[3] = (relative) ? x[0] + dx : dx;
 558                                 y[3] = (relative) ? y[0] + dy : dy;
 559                         }
 560                         else
 561                         {
 562                                 x[3] = x[2];
 563                                 y[3] = y[2];
 564                                 Real old_x1(x[1]), old_y1(y[1]);
 565                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 566                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 567                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 568                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 569                         }
 570
 571                         Real x3(x[3]);
 572                         Real y3(y[3]);
 573                         for (int j = 0; j < 4; ++j)
 574                                 TransformXYPair(x[j],y[j], transform);
 575
 576                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 577                         Add(BEZIER,Rect(0,0,1,1),index);
 578
 579
 580                         //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]));
 581
 582                         x[0] = x3;
 583                         y[0] = y3;
 584
 585
 586                 }
 587                 else if (command == "l" || command == "L")
 588                 {
 589                         Debug("Construct lineto command, relative %d", relative);
 590
 591                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 592                         assert(GetToken(d,token,i,delims) == ",");
 593                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 594
 595                         x[1] = (relative) ? x[0] + dx : dx;
 596                         y[1] = (relative) ? y[0] + dy : dy;
 597
 598                         Real x1(x[1]);
 599                         Real y1(y[1]);
 600
 601                         TransformXYPair(x[0],y[0],transform);
 602                         TransformXYPair(x[1],y[1],transform);
 603
 604
 605                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
 606                         Add(BEZIER,Rect(0,0,1,1),index);
 607
 608                         //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 609
 610                         x[0] = x1;
 611                         y[0] = y1;
 612
 613                 }
 614                 else if (command == "z" || command == "Z")
 615                 {
 616                         //Debug("Construct returnto command");
 617                         x[1] = x0;
 618                         y[1] = y0;
 619                         x[2] = x0;
 620                         y[2] = y0;
 621                         x[3] = x0;
 622                         y[3] = y0;
 623
 624                         Real x3(x[3]);
 625                         Real y3(y[3]);
 626                         for (int j = 0; j < 4; ++j)
 627                                 TransformXYPair(x[j],y[j], transform);
 628
 629                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 630                         Add(BEZIER,Rect(0,0,1,1),index);
 631
 632                         //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 633
 634                         x[0] = x3;
 635                         y[0] = y3;
 636                         command = "m";
 637                 }
 638                 else
 639                 {
 640                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 641                         command = "m";
 642                 }
 643
 644                 if (!start)
 645                 {
 646                         x0 = x[0];
 647                         y0 = y[0];
 648                         start = true;
 649                 }
 650                 prev_i = i;
 651         }
 652 }
 653
 654 void Document::SetFont(const string & font_filename)
 655 {
 656         if (m_font_data != NULL)
 657         {
 658                 free(m_font_data);
 659         }
 660
 661         FILE *font_file = fopen("DejaVuSansMono.ttf", "rb");
 662         fseek(font_file, 0, SEEK_END);
 663         size_t font_file_size = ftell(font_file);
 664         fseek(font_file, 0, SEEK_SET);
 665         m_font_data = (unsigned char*)malloc(font_file_size);
 666         size_t read = fread(m_font_data, 1, font_file_size, font_file);
 667         if (read != font_file_size)
 668         {
 669                 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
 670         }
 671         fclose(font_file);
 672         stbtt_InitFont(&m_font, m_font_data, 0);
 673 }
 674
 675 void Document::AddText(const string & text, Real scale, Real x, Real y)
 676 {
 677         if (m_font_data == NULL)
 678         {
 679                 Warn("No font loaded");
 680                 return;
 681         }
 682
 683         float font_scale = stbtt_ScaleForPixelHeight(&m_font, scale);
 684         Real x0(x);
 685         //Real y0(y);
 686         int ascent = 0, descent = 0, line_gap = 0;
 687         stbtt_GetFontVMetrics(&m_font, &ascent, &descent, &line_gap);
 688         Real y_advance = Real(font_scale) * Real(ascent - descent + line_gap);
 689         for (unsigned i = 0; i < text.size(); ++i)
 690         {
 691                 if (text[i] == '\n')
 692                 {
 693                         y += y_advance;
 694                         x = x0;
 695                 }
 696                 if (!isprint(text[i]))
 697                         continue;
 698
 699                 int advance_width = 0, left_side_bearing = 0, kerning = 0;
 700                 stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
 701                 if (i > 1)
 702                 {
 703                         kerning = stbtt_GetCodepointKernAdvance(&m_font, text[i-1], text[i]);
 704                 }
 705                 x += Real(font_scale) * Real(left_side_bearing + kerning);
 706                 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
 707                 x += Real(font_scale) * Real(advance_width);
 708         }
 709 }
 710
 711 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 712 {
 713         int glyph_index = stbtt_FindGlyphIndex(font, character);
 714
 715         // Check if there is actully a glyph to render.
 716         if (stbtt_IsGlyphEmpty(font, glyph_index))
 717         {
 718                 return;
 719         }
 720
 721         stbtt_vertex *instructions;
 722         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 723
 724         Real current_x(0), current_y(0);
 725
 726         for (int i = 0; i < num_instructions; ++i)
 727         {
 728                 // TTF uses 16-bit signed ints for coordinates:
 729                 // with the y-axis inverted compared to us.
 730                 // Convert and scale any data.
 731                 Real inst_x = Real(instructions[i].x)*scale;
 732                 Real inst_y = Real(instructions[i].y)*-scale;
 733                 Real inst_cx = Real(instructions[i].cx)*scale;
 734                 Real inst_cy = Real(instructions[i].cy)*-scale;
 735                 Real old_x(current_x), old_y(current_y);
 736                 current_x = inst_x;
 737                 current_y = inst_y;
 738                 unsigned bezier_index;
 739                 switch(instructions[i].type)
 740                 {
 741                 // Move To
 742                 case STBTT_vmove:
 743                         break;
 744                 // Line To
 745                 case STBTT_vline:
 746                         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));
 747                         Add(BEZIER,Rect(0,0,1,1),bezier_index);
 748                         break;
 749                 // Quadratic Bezier To:
 750                 case STBTT_vcurve:
 751                         // Quadratic -> Cubic:
 752                         // - Endpoints are the same.
 753                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
 754                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
 755                         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,
 756                                                 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));
 757                         Add(BEZIER,Rect(0,0,1,1),bezier_index);
 758                         break;
 759                 }
 760         }
 761
 762         stbtt_FreeShape(font, instructions);
 763 }