src/document.cpp

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