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         GenQuadParent(0, QTC_BOTTOM_RIGHT);
 101 }
 102
 103 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 104 {
 105         QuadTreeIndex new_index = m_quadtree.nodes.size();
 106         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 107
 108         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 109         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 110         {
 111                 if (ContainedInQuadChild(m_objects.bounds[i], type))
 112                 {
 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
 267 void Document::ParseSVGNode(pugi::xml_node & root, const Rect & bounds, Real & width, Real & height)
 268 {
 269         Debug("Parse node <%s>", root.name());
 270         pugi::xml_attribute attrib_w = root.attribute("width");
 271         pugi::xml_attribute attrib_h = root.attribute("height");
 272         if (!attrib_w.empty())
 273                 width = attrib_w.as_float() * bounds.w;
 274         if (!attrib_h.empty())
 275                 height = attrib_h.as_float() * bounds.h;
 276
 277         for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
 278         {
 279
 280
 281                 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
 282                         || strcmp(child.name(), "group") == 0)
 283                 {
 284                         //TODO: Handle translates etc here
 285                         ParseSVGNode(child, bounds, width, height);
 286                         continue;
 287                 }
 288                 else if (strcmp(child.name(), "path") == 0)
 289                 {
 290                         string d = child.attribute("d").as_string();
 291                         Debug("Path data attribute is \"%s\"", d.c_str());
 292                         ParseSVGPathData(d, Rect(bounds.x,bounds.y,width,height));
 293                 }
 294                 else if (strcmp(child.name(), "line") == 0)
 295                 {
 296                         Real x0(child.attribute("x1").as_float()/width + bounds.x);
 297                         Real y0(child.attribute("y1").as_float()/height + bounds.y);
 298                         Real x1(child.attribute("x2").as_float()/width + bounds.x);
 299                         Real y1(child.attribute("y2").as_float()/height + bounds.y);
 300                         unsigned index = AddBezierData(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
 301                         Add(BEZIER, Rect(0,0,1,1), index);
 302                 }
 303                 else if (strcmp(child.name(), "rect") == 0)
 304                 {
 305                         Real coords[4];
 306                         const char * attrib_names[] = {"x", "y", "width", "height"};
 307                         for (size_t i = 0; i < 4; ++i)
 308                                 coords[i] = child.attribute(attrib_names[i]).as_float();
 309
 310                         bool outline = !(child.attribute("fill"));
 311                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0]/width + bounds.x, coords[1]/height + bounds.y, coords[2]/width, coords[3]/height),0);
 312                 }
 313                 else if (strcmp(child.name(), "circle") == 0)
 314                 {
 315                         Real cx = child.attribute("cx").as_float();
 316                         Real cy = child.attribute("cy").as_float();
 317                         Real r = child.attribute("r").as_float();
 318
 319                         Real x = (cx - r)/width + bounds.x;
 320                         Real y = (cy - r)/height + bounds.y;
 321                         Real w = Real(2)*r/width;
 322                         Real h = Real(2)*r/height;
 323
 324                         Rect rect(x,y,w,h);
 325                         Add(CIRCLE_FILLED, rect,0);
 326                         Debug("Added Circle %s", rect.Str().c_str());
 327                 }
 328                 else if (strcmp(child.name(), "text") == 0)
 329                 {
 330                         Real x = child.attribute("x").as_float()/width + bounds.x;
 331                         Real y = child.attribute("y").as_float()/height + bounds.y;
 332                         Debug("Add text \"%s\"", child.child_value());
 333                         AddText(child.child_value(), 0.05, x, y);
 334                 }
 335         }
 336 }
 337
 338 /**
 339  * Load an SVG into a rectangle
 340  */
 341 void Document::LoadSVG(const string & filename, const Rect & bounds)
 342 {
 343         using namespace pugi;
 344
 345         xml_document doc_xml;
 346         ifstream input(filename.c_str(), ios_base::in);
 347         xml_parse_result result = doc_xml.load(input);
 348
 349         if (!result)
 350                 Fatal("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 351
 352         Debug("Loaded XML - %s", result.description());
 353
 354         input.close();
 355         Real width(1);
 356         Real height(1);
 357         ParseSVGNode(doc_xml, bounds,width,height);
 358 }
 359
 360 // Behold my amazing tokenizing abilities
 361 static string & GetToken(const string & d, string & token, unsigned & i)
 362 {
 363         token.clear();
 364         while (i < d.size() && iswspace(d[i]))
 365         {
 366                 ++i;
 367         }
 368
 369         while (i < d.size())
 370         {
 371                 if (d[i] == ',' || (isalpha(d[i]) && d[i] != 'e') || iswspace(d[i]))
 372                 {
 373                         if (token.size() == 0 && !iswspace(d[i]))
 374                         {
 375                                 token += d[i++];
 376                         }
 377                         break;
 378                 }
 379                 token += d[i++];
 380         }
 381         //Debug("Got token \"%s\"", token.c_str());
 382         return token;
 383 }
 384
 385
 386 // Fear the wrath of the tokenizing svg data
 387 // Seriously this isn't really very DOM-like at all is it?
 388 void Document::ParseSVGPathData(const string & d, const Rect & bounds)
 389 {
 390         Real x[4] = {0,0,0,0};
 391         Real y[4] = {0,0,0,0};
 392
 393         string token("");
 394         string command("m");
 395
 396         Real x0(0);
 397         Real y0(0);
 398
 399         unsigned i = 0;
 400         unsigned prev_i = 0;
 401
 402         bool start = false;
 403
 404         while (i < d.size() && GetToken(d, token, i).size() > 0)
 405         {
 406                 if (isalpha(token[0]))
 407                         command = token;
 408                 else
 409                 {
 410                         i = prev_i; // hax
 411                         if(command == "")
 412                                 command = "L";
 413                 }
 414
 415                 bool relative = islower(command[0]);
 416
 417                 if (command == "m" || command == "M")
 418                 {
 419                         Debug("Construct moveto command");
 420                         Real dx = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.w;
 421                         assert(GetToken(d,token,i) == ",");
 422                         Real dy = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.h;
 423
 424                         x[0] = (relative) ? x[0] + dx : dx;
 425                         y[0] = (relative) ? y[0] + dy : dy;
 426
 427
 428
 429                         Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 430                         command = (command == "m") ? "l" : "L";
 431                 }
 432                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 433                 {
 434                         Debug("Construct curveto command");
 435                         Real dx = Real(strtod(GetToken(d,token,i).c_str(),NULL))/bounds.w;
 436                         assert(GetToken(d,token,i) == ",");
 437                         Real dy = Real(strtod(GetToken(d,token,i).c_str(),NULL))/bounds.h;
 438
 439                         x[1] = (relative) ? x[0] + dx : dx;
 440                         y[1] = (relative) ? y[0] + dy : dy;
 441
 442                         dx = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.w;
 443                         assert(GetToken(d,token,i) == ",");
 444                         dy = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.h;
 445
 446                         x[2] = (relative) ? x[0] + dx : dx;
 447                         y[2] = (relative) ? y[0] + dy : dy;
 448
 449                         if (command != "q" && command != "Q")
 450                         {
 451                                 dx = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.w;
 452                                 assert(GetToken(d,token,i) == ",");
 453                                 dy = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.h;
 454                                 x[3] = (relative) ? x[0] + dx : dx;
 455                                 y[3] = (relative) ? y[0] + dy : dy;
 456                         }
 457                         else
 458                         {
 459                                 x[3] = x[2];
 460                                 y[3] = y[2];
 461                                 Real old_x1(x[1]), old_y1(y[1]);
 462                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 463                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 464                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 465                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 466                         }
 467
 468                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 469                         Add(BEZIER,Rect(0,0,1,1),index);
 470
 471
 472                         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]));
 473
 474                         x[0] = x[3];
 475                         y[0] = y[3];
 476
 477
 478                 }
 479                 else if (command == "l" || command == "L")
 480                 {
 481                         Debug("Construct lineto command");
 482
 483                         Real dx = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.w;
 484                         assert(GetToken(d,token,i) == ",");
 485                         Real dy = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.h;
 486
 487                         x[1] = (relative) ? x[0] + dx : dx;
 488                         y[1] = (relative) ? y[0] + dy : dy;
 489
 490                         x[2] = x[1];
 491                         y[2] = y[1];
 492
 493                         x[3] = x[1];
 494                         y[3] = y[1];
 495
 496                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 497                         Add(BEZIER,Rect(0,0,1,1),index);
 498
 499                         Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 500
 501                         x[0] = x[3];
 502                         y[0] = y[3];
 503
 504                 }
 505                 else if (command == "z" || command == "Z")
 506                 {
 507                         Debug("Construct returnto command");
 508                         x[1] = x0;
 509                         y[1] = y0;
 510                         x[2] = x0;
 511                         y[2] = y0;
 512                         x[3] = x0;
 513                         y[3] = y0;
 514
 515                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 516                         Add(BEZIER,Rect(0,0,1,1),index);
 517
 518                         Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 519
 520                         x[0] = x[3];
 521                         y[0] = y[3];
 522                         command = "m";
 523                 }
 524                 else
 525                 {
 526                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 527                         command = "m";
 528                 }
 529
 530                 if (!start)
 531                 {
 532                         x0 = x[0];
 533                         y0 = y[0];
 534                         start = true;
 535                 }
 536                 prev_i = i;
 537         }
 538 }
 539
 540 void Document::SetFont(const string & font_filename)
 541 {
 542         if (m_font_data != NULL)
 543         {
 544                 free(m_font_data);
 545         }
 546
 547         FILE *font_file = fopen("DejaVuSansMono.ttf", "rb");
 548         fseek(font_file, 0, SEEK_END);
 549         size_t font_file_size = ftell(font_file);
 550         fseek(font_file, 0, SEEK_SET);
 551         m_font_data = (unsigned char*)malloc(font_file_size);
 552         size_t read = fread(m_font_data, 1, font_file_size, font_file);
 553         if (read != font_file_size)
 554         {
 555                 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
 556         }
 557         fclose(font_file);
 558         stbtt_InitFont(&m_font, m_font_data, 0);
 559 }
 560
 561 void Document::AddText(const string & text, Real scale, Real x, Real y)
 562 {
 563         if (m_font_data == NULL)
 564         {
 565                 Warn("No font loaded");
 566                 return;
 567         }
 568
 569         float font_scale = stbtt_ScaleForPixelHeight(&m_font, scale);
 570         Real x0(x);
 571         //Real y0(y);
 572         for (unsigned i = 0; i < text.size(); ++i)
 573         {
 574                 if (text[i] == '\n')
 575                 {
 576                         y += 0.5*scale;
 577                         x = x0;
 578                 }
 579                 if (!isprint(text[i]))
 580                         continue;
 581
 582                 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
 583                 x += 0.5*scale;
 584         }
 585 }
 586
 587 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 588 {
 589         int glyph_index = stbtt_FindGlyphIndex(font, character);
 590
 591         // Check if there is actully a glyph to render.
 592         if (stbtt_IsGlyphEmpty(font, glyph_index))
 593         {
 594                 return;
 595         }
 596
 597         stbtt_vertex *instructions;
 598         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 599
 600         Real current_x(0), current_y(0);
 601
 602         for (int i = 0; i < num_instructions; ++i)
 603         {
 604                 // TTF uses 16-bit signed ints for coordinates:
 605                 // with the y-axis inverted compared to us.
 606                 // Convert and scale any data.
 607                 Real inst_x = Real(instructions[i].x)*scale;
 608                 Real inst_y = Real(instructions[i].y)*-scale;
 609                 Real inst_cx = Real(instructions[i].cx)*scale;
 610                 Real inst_cy = Real(instructions[i].cy)*-scale;
 611                 Real old_x(current_x), old_y(current_y);
 612                 current_x = inst_x;
 613                 current_y = inst_y;
 614                 unsigned bezier_index;
 615                 switch(instructions[i].type)
 616                 {
 617                 // Move To
 618                 case STBTT_vmove:
 619                         break;
 620                 // Line To
 621                 case STBTT_vline:
 622                         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));
 623                         Add(BEZIER,Rect(0,0,1,1),bezier_index);
 624                         break;
 625                 // Quadratic Bezier To:
 626                 case STBTT_vcurve:
 627                         // Quadratic -> Cubic:
 628                         // - Endpoints are the same.
 629                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
 630                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
 631                         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,
 632                                                 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));
 633                         Add(BEZIER,Rect(0,0,1,1),bezier_index);
 634                         break;
 635                 }
 636         }
 637
 638         stbtt_FreeShape(font, instructions);
 639 }