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 obj_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 136                 if (obj_bounds.x < 0)
 137                 {
 138                         obj_bounds.w += obj_bounds.x;
 139                         obj_bounds.x = 0;
 140                 }
 141                 if (obj_bounds.y < 0)
 142                 {
 143                         obj_bounds.h += obj_bounds.y;
 144                         obj_bounds.y = 0;
 145                 }
 146                 if (obj_bounds.x + obj_bounds.w > 1)
 147                 {
 148                         obj_bounds.w += (1 - (obj_bounds.x + obj_bounds.w));
 149                 }
 150                 if (obj_bounds.y + obj_bounds.h > 1)
 151                 {
 152                         obj_bounds.h += (1 - (obj_bounds.y + obj_bounds.h));
 153                 }
 154                 Rect child_node_bounds = TransformFromQuadChild(obj_bounds, type);
 155                 Rect clip_bezier_bounds;
 156                 clip_bezier_bounds.x = (child_node_bounds.x - m_objects.bounds[object_id].x) / m_objects.bounds[object_id].w;
 157                 clip_bezier_bounds.y = (child_node_bounds.y - m_objects.bounds[object_id].y) / m_objects.bounds[object_id].h;
 158                 clip_bezier_bounds.w = child_node_bounds.w / m_objects.bounds[object_id].w;
 159                 clip_bezier_bounds.h = child_node_bounds.h / m_objects.bounds[object_id].h;
 160                 std::vector<Bezier> new_curves = Bezier(m_objects.beziers[m_objects.data_indices[object_id]], child_node_bounds).ClipToRectangle(clip_bezier_bounds);
 161                 for (size_t i = 0; i < new_curves.size(); ++i)
 162                 {
 163                         Rect new_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 164                         new_bounds = TransformToQuadChild(new_curves[i].SolveBounds(), type);
 165                         Bezier new_curve_data = new_curves[i].ToRelative(new_bounds);
 166                         unsigned index = AddBezierData(new_curve_data);
 167                         m_objects.bounds.push_back(new_bounds);
 168                         m_objects.types.push_back(BEZIER);
 169                         m_objects.data_indices.push_back(index);
 170                 }
 171                 return new_curves.size();
 172                 }
 173         default:
 174                 Debug("Adding %s -> %s", m_objects.bounds[object_id].Str().c_str(), TransformToQuadChild(m_objects.bounds[object_id], type).Str().c_str());
 175                 m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 176                 m_objects.types.push_back(m_objects.types[object_id]);
 177                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 178                 return 1;
 179         }
 180         return 0;
 181 }
 182 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 183 {
 184         QuadTreeIndex new_index = m_quadtree.nodes.size();
 185         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 186
 187         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 188         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 189         {
 190                 if (IntersectsQuadChild(m_objects.bounds[i], type))
 191                 {
 192                         m_count += ClipObjectToQuadChild(i, type);
 193                 }
 194         }
 195         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 196         switch (type)
 197         {
 198                 case QTC_TOP_LEFT:
 199                         m_quadtree.nodes[parent].top_left = new_index;
 200                         break;
 201                 case QTC_TOP_RIGHT:
 202                         m_quadtree.nodes[parent].top_right = new_index;
 203                         break;
 204                 case QTC_BOTTOM_LEFT:
 205                         m_quadtree.nodes[parent].bottom_left = new_index;
 206                         break;
 207                 case QTC_BOTTOM_RIGHT:
 208                         m_quadtree.nodes[parent].bottom_right = new_index;
 209                         break;
 210                 default:
 211                         Fatal("Tried to add a QuadTree child of invalid type!");
 212         }
 213         return new_index;
 214 }
 215
 216 // Reparent a quadtree node, making it the "type" child of a new node.
 217 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 218 {
 219         QuadTreeIndex new_index = m_quadtree.nodes.size();
 220         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
 221
 222         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 223         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 224         {
 225                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 226                 m_objects.types.push_back(m_objects.types[i]);
 227                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 228                 m_count++;
 229         }
 230         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 231         switch (type)
 232         {
 233                 case QTC_TOP_LEFT:
 234                         m_quadtree.nodes[new_index].top_left = child;
 235                         break;
 236                 case QTC_TOP_RIGHT:
 237                         m_quadtree.nodes[new_index].top_right = child;
 238                         break;
 239                 case QTC_BOTTOM_LEFT:
 240                         m_quadtree.nodes[new_index].bottom_left = child;
 241                         break;
 242                 case QTC_BOTTOM_RIGHT:
 243                         m_quadtree.nodes[new_index].bottom_right = child;
 244                         break;
 245                 default:
 246                         Fatal("Tried to add a QuadTree child of invalid type!");
 247         }
 248         return new_index;
 249 }
 250
 251 #endif
 252
 253 void Document::Load(const string & filename)
 254 {
 255         m_objects.bounds.clear();
 256         m_count = 0;
 257         if (filename == "")
 258         {
 259                 Debug("Loaded empty document.");
 260                 return;
 261         }
 262         Debug("Loading document from file \"%s\"", filename.c_str());
 263         FILE * file = fopen(filename.c_str(), "r");
 264         if (file == NULL)
 265                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 266
 267         size_t read;
 268
 269         DocChunkTypes chunk_type;
 270         uint32_t chunk_size;
 271         while (ReadChunkHeader(file, chunk_type, chunk_size))
 272         {
 273                 switch(chunk_type)
 274                 {
 275                 case CT_NUMOBJS:
 276                         read = fread(&m_count, sizeof(m_count), 1, file);
 277                         if (read != 1)
 278                                 Fatal("Failed to read number of objects!");
 279                         Debug("Number of objects: %u", ObjectCount());
 280                         break;
 281                 case CT_OBJTYPES:
 282                         Debug("Object types...");
 283                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 284                         break;
 285                 case CT_OBJBOUNDS:
 286                         Debug("Object bounds...");
 287                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 288                         break;
 289                 case CT_OBJINDICES:
 290                         Debug("Object data indices...");
 291                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 292                         break;
 293                 case CT_OBJBEZIERS:
 294                         Debug("Bezier data...");
 295                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 296                         break;
 297
 298                 case CT_OBJPATHS:
 299                         Debug("Path data...");
 300                         Warn("Not handled because lazy");
 301                         break;
 302                 }
 303         }
 304         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 305 #ifndef QUADTREE_DISABLED
 306         if (m_quadtree.root_id == QUADTREE_EMPTY)
 307         {
 308                 GenBaseQuadtree();
 309         }
 310 #endif
 311 }
 312
 313 unsigned Document::AddPath(unsigned start_index, unsigned end_index, const Colour & fill)
 314 {
 315         Path path(m_objects, start_index, end_index, fill);
 316         unsigned data_index = AddPathData(path);
 317         Rect bounds = path.SolveBounds(m_objects);
 318         unsigned result = Add(PATH, bounds,data_index);
 319         return result;
 320 }
 321
 322 /**
 323  * Add a Bezier using Absolute coords
 324  */
 325 unsigned Document::AddBezier(const Bezier & bezier)
 326 {
 327         Rect bounds = bezier.SolveBounds();
 328         Bezier data = bezier.ToRelative(bounds); // Relative
 329         if (data.ToAbsolute(bounds) != bezier)
 330         {
 331                 Error("%s != %s", data.ToAbsolute(Rect(0,0,1,1)).Str().c_str(),
 332                         bezier.Str().c_str());
 333                 Fatal("ToAbsolute on ToRelative does not give original Bezier");
 334         }
 335         unsigned index = AddBezierData(data);
 336         return Add(BEZIER, bounds, index);
 337 }
 338
 339 unsigned Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 340 {
 341         m_objects.types.push_back(type);
 342         m_objects.bounds.push_back(bounds);
 343         m_objects.data_indices.push_back(data_index);
 344         return (m_count++); // Why can't we just use the size of types or something?
 345 }
 346
 347 unsigned Document::AddBezierData(const Bezier & bezier)
 348 {
 349         m_objects.beziers.push_back(bezier);
 350         return m_objects.beziers.size()-1;
 351 }
 352
 353 unsigned Document::AddPathData(const Path & path)
 354 {
 355         m_objects.paths.push_back(path);
 356         return m_objects.paths.size()-1;
 357 }
 358
 359 void Document::DebugDumpObjects()
 360 {
 361         Debug("Objects for Document %p are:", this);
 362         for (unsigned id = 0; id < ObjectCount(); ++id)
 363         {
 364                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 365         }
 366 }
 367
 368 bool Document::operator==(const Document & equ) const
 369 {
 370         return (ObjectCount() == equ.ObjectCount()
 371                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 372                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 373                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 374 }
 375
 376
 377
 378 // Behold my amazing tokenizing abilities
 379 static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
 380 {
 381         token.clear();
 382         while (i < d.size() && iswspace(d[i]))
 383         {
 384                 ++i;
 385         }
 386
 387         while (i < d.size())
 388         {
 389                 if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
 390                 {
 391                         if (token.size() == 0 && !iswspace(d[i]))
 392                         {
 393                                 token += d[i++];
 394                         }
 395                         break;
 396                 }
 397                 token += d[i++];
 398         }
 399         //Debug("Got token \"%s\"", token.c_str());
 400         return token;
 401 }
 402
 403 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
 404 {
 405         string token("");
 406         while (GetToken(d, token, i, delims) == ",");
 407         x = strtod(token.c_str(),NULL);
 408         if (GetToken(d, token, i, delims) != ",")
 409         {
 410                 Fatal("Expected \",\" seperating x,y pair");
 411         }
 412         y = strtod(GetToken(d, token, i, delims).c_str(),NULL);
 413 }
 414
 415 static bool GetKeyValuePair(const string & d, string & key, string & value, unsigned & i, const string & delims = "()[],{}<>;:=")
 416 {
 417         key = "";
 418         string token;
 419         while (GetToken(d, token, i, delims) == ":" || token == ";");
 420         key = token;
 421         if (GetToken(d, token, i, delims) != ":")
 422         {
 423                 Error("Expected \":\" seperating key:value pair");
 424                 return false;
 425         }
 426         value = "";
 427         GetToken(d, value, i, delims);
 428         return true;
 429 }
 430
 431 static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
 432 {
 433         Real x0(x);
 434         x = transform.a * x + transform.c * y + transform.e;
 435         y = transform.b * x0 + transform.d * y + transform.f;
 436 }
 437
 438 void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
 439 {
 440         //Debug("Parsing transform %s", s.c_str());
 441         string token;
 442         string command;
 443         unsigned i = 0;
 444
 445         while (i < s.size())
 446         {
 447                 GetToken(s, command, i);
 448                 if (command == "," || command == "" || command == ":")
 449                 {
 450                         if (i < s.size())
 451                                 GetToken(s, command, i);
 452                         else
 453                                 return;
 454                 }
 455                 //Debug("Token is \"%s\"", command.c_str());
 456
 457                 SVGMatrix delta = {1,0,0,0,1,0};
 458
 459
 460                 assert(GetToken(s,token, i) == "(");
 461                 if (command == "translate")
 462                 {
 463                         GetXYPair(s, delta.e, delta.f, i);
 464                         assert(GetToken(s,token, i) == ")");
 465                 }
 466                 else if (command == "matrix")
 467                 {
 468                         GetXYPair(s, delta.a, delta.b,i);
 469                         GetXYPair(s, delta.c, delta.d,i);
 470                         GetXYPair(s, delta.e, delta.f,i);
 471                         assert(GetToken(s,token, i) == ")");
 472                 }
 473                 else if (command == "scale")
 474                 {
 475                         delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
 476                         GetToken(s, token, i);
 477                         if (token == ",")
 478                         {
 479                                 delta.d = (strtod(GetToken(s,token,i).c_str(), NULL));
 480                                 assert(GetToken(s, token, i) == ")");
 481                         }
 482                         else
 483                         {
 484                                 delta.d = delta.a;
 485                                 assert(token == ")");
 486                         }
 487
 488                 }
 489                 else
 490                 {
 491                         Warn("Unrecognised transform \"%s\", using identity", command.c_str());
 492                 }
 493
 494                 //Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 495                 //Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
 496
 497                 SVGMatrix old(transform);
 498                 transform.a = old.a * delta.a + old.c * delta.b;
 499                 transform.c = old.a * delta.c + old.c * delta.d;
 500                 transform.e = old.a * delta.e + old.c * delta.f + old.e;
 501
 502                 transform.b = old.b * delta.a + old.d * delta.b;
 503                 transform.d = old.b * delta.c + old.d * delta.d;
 504                 transform.f = old.b * delta.e + old.d * delta.f + old.f;
 505
 506                 //Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 507         }
 508 }
 509
 510 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
 511 {
 512         //Debug("Parse node <%s>", root.name());
 513
 514
 515         for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
 516         {
 517                 SVGMatrix transform(parent_transform);
 518                 pugi::xml_attribute attrib_trans = child.attribute("transform");
 519                 if (!attrib_trans.empty())
 520                 {
 521                         ParseSVGTransform(attrib_trans.as_string(), transform);
 522                 }
 523
 524
 525
 526                 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
 527                         || strcmp(child.name(), "group") == 0)
 528                 {
 529
 530                         ParseSVGNode(child, transform);
 531                         continue;
 532                 }
 533                 else if (strcmp(child.name(), "path") == 0)
 534                 {
 535                         string d = child.attribute("d").as_string();
 536                         //Debug("Path data attribute is \"%s\"", d.c_str());
 537                         bool closed = false;
 538                         pair<unsigned, unsigned> range = ParseSVGPathData(d, transform, closed);
 539                         if (closed)
 540                         {
 541                                 Colour c(0,0,0,0);
 542                                 string colour_str("");
 543                                 map<string, string> style;
 544                                 if (child.attribute("style"))
 545                                 {
 546                                         ParseSVGStyleData(child.attribute("style").as_string(), style);
 547                                 }
 548
 549                                 // Determine shading colour
 550                                 if (child.attribute("fill"))
 551                                 {
 552                                         colour_str = child.attribute("fill").as_string();
 553                                 }
 554                                 else if (style.find("fill") != style.end())
 555                                 {
 556                                         colour_str = style["fill"];
 557                                 }
 558                                 if (colour_str == "red")
 559                                         c = {1,0,0,1};
 560                                 else if (colour_str == "blue")
 561                                         c = {0,0,1,1};
 562                                 else if (colour_str == "green")
 563                                         c = {0,1,0,1};
 564                                 else if (colour_str == "black")
 565                                         c = {0,0,0,1};
 566                                 else if (colour_str == "white")
 567                                         c = {1,1,1,1};
 568                                 else if (colour_str.size() == 7 && colour_str[0] == '#')
 569                                 {
 570                                         Debug("Parse colour string: \"%s\"", colour_str.c_str());
 571                                         char comp[2] = {colour_str[1], colour_str[2]};
 572                                         c.r = Real(strtoul(comp, NULL, 16))/Real(255);
 573                                         comp[0] = colour_str[3]; comp[1] = colour_str[4];
 574                                         c.g = Real(strtoul(comp, NULL, 16))/Real(255);
 575                                         comp[0] = colour_str[5]; comp[1] = colour_str[6];
 576                                         c.b = Real(strtoul(comp, NULL, 16))/Real(255);
 577                                         c.a = 1;
 578                                         Debug("Colour is: %f, %f, %f, %f", Float(c.r), Float(c.g), Float(c.b), Float(c.a));
 579                                 }
 580
 581                                 // Determin shading alpha
 582                                 if (child.attribute("fill-opacity"))
 583                                 {
 584                                         c.a = child.attribute("fill-opacity").as_float();
 585                                 }
 586                                 else if (style.find("fill-opacity") != style.end())
 587                                 {
 588                                         c.a = strtod(style["fill-opacity"].c_str(), NULL);
 589                                 }
 590
 591                                         Debug("fill-opacity is %f", Float(c.a));
 592                                 AddPath(range.first, range.second, c);
 593                         }
 594
 595                 }
 596                 else if (strcmp(child.name(), "line") == 0)
 597                 {
 598                         Real x0(child.attribute("x1").as_float());
 599                         Real y0(child.attribute("y1").as_float());
 600                         Real x1(child.attribute("x2").as_float());
 601                         Real y1(child.attribute("y2").as_float());
 602                         TransformXYPair(x0,y0,transform);
 603                         TransformXYPair(x1,y1,transform);
 604                         AddBezier(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
 605                 }
 606                 else if (strcmp(child.name(), "rect") == 0)
 607                 {
 608                         Real coords[4];
 609                         const char * attrib_names[] = {"x", "y", "width", "height"};
 610                         for (size_t i = 0; i < 4; ++i)
 611                                 coords[i] = child.attribute(attrib_names[i]).as_float();
 612
 613                         Real x2(coords[0]+coords[2]);
 614                         Real y2(coords[1]+coords[3]);
 615                         TransformXYPair(coords[0],coords[1],transform); // x, y, transform
 616                         TransformXYPair(x2,y2,transform);
 617                         coords[2] = x2 - coords[0];
 618                         coords[3] = y2 - coords[1];
 619
 620                         bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
 621                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
 622                 }
 623                 else if (strcmp(child.name(), "circle") == 0)
 624                 {
 625                         Real cx = child.attribute("cx").as_float();
 626                         Real cy = child.attribute("cy").as_float();
 627                         Real r = child.attribute("r").as_float();
 628
 629                         Real x = (cx - r);
 630                         Real y = (cy - r);
 631                         TransformXYPair(x,y,transform);
 632                         Real w = Real(2)*r*transform.a; // width scales
 633                         Real h = Real(2)*r*transform.d; // height scales
 634
 635
 636                         Rect rect(x,y,w,h);
 637                         Add(CIRCLE_FILLED, rect,0);
 638                         Debug("Added Circle %s", rect.Str().c_str());
 639                 }
 640                 else if (strcmp(child.name(), "text") == 0)
 641                 {
 642                         Real x = child.attribute("x").as_float();
 643                         Real y = child.attribute("y").as_float();
 644                         TransformXYPair(x,y,transform);
 645                         Debug("Add text \"%s\"", child.child_value());
 646                         AddText(child.child_value(), 0.05, x, y);
 647                 }
 648         }
 649 }
 650
 651 void Document::ParseSVGStyleData(const string & style, map<string, string> & results)
 652 {
 653         unsigned i = 0;
 654         string key;
 655         string value;
 656         while (i < style.size() && GetKeyValuePair(style, key, value, i))
 657         {
 658                 results[key] = value;
 659         }
 660 }
 661
 662 /**
 663  * Parse an SVG string into a rectangle
 664  */
 665 void Document::ParseSVG(const string & input, const Rect & bounds)
 666 {
 667         using namespace pugi;
 668
 669         xml_document doc_xml;
 670         xml_parse_result result = doc_xml.load(input.c_str());
 671
 672         if (!result)
 673                 Error("Couldn't parse SVG input - %s", result.description());
 674
 675         Debug("Loaded XML - %s", result.description());
 676         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 677         ParseSVGNode(doc_xml, transform);
 678 }
 679
 680 /**
 681  * Load an SVG into a rectangle
 682  */
 683 void Document::LoadSVG(const string & filename, const Rect & bounds)
 684 {
 685         using namespace pugi;
 686
 687         xml_document doc_xml;
 688         ifstream input(filename.c_str(), ios_base::in);
 689         xml_parse_result result = doc_xml.load(input);
 690
 691         if (!result)
 692                 Error("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 693
 694         Debug("Loaded XML - %s", result.description());
 695
 696         input.close();
 697                                                 // a c e, b d f
 698         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 699         ParseSVGNode(doc_xml, transform);
 700 }
 701
 702
 703
 704 // Fear the wrath of the tokenizing svg data
 705 // Seriously this isn't really very DOM-like at all is it?
 706 pair<unsigned, unsigned> Document::ParseSVGPathData(const string & d, const SVGMatrix & transform, bool & closed)
 707 {
 708         closed = false;
 709         Real x[4] = {0,0,0,0};
 710         Real y[4] = {0,0,0,0};
 711
 712         string token("");
 713         string command("m");
 714
 715         Real x0(0);
 716         Real y0(0);
 717
 718         unsigned i = 0;
 719         unsigned prev_i = 0;
 720
 721         bool start = false;
 722
 723
 724         static string delims("()[],{}<>;:=LlHhVvmMqQzZcC");
 725
 726         pair<unsigned, unsigned> range(m_count, m_count);
 727
 728         while (i < d.size() && GetToken(d, token, i, delims).size() > 0)
 729         {
 730                 if (isalpha(token[0]))
 731                         command = token;
 732                 else
 733                 {
 734                         i = prev_i; // hax
 735                         if(command == "")
 736                                 command = "L";
 737                 }
 738
 739                 bool relative = islower(command[0]);
 740
 741                 if (command == "m" || command == "M")
 742                 {
 743                         //Debug("Construct moveto command");
 744                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 745                         assert(GetToken(d,token,i,delims) == ",");
 746                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 747
 748                         x[0] = (relative) ? x[0] + dx : dx;
 749                         y[0] = (relative) ? y[0] + dy : dy;
 750
 751                         x0 = x[0];
 752                         y0 = y[0];
 753                         //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 754                         command = (command == "m") ? "l" : "L";
 755                 }
 756                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 757                 {
 758                         //Debug("Construct curveto command");
 759                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 760                         assert(GetToken(d,token,i,delims) == ",");
 761                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 762
 763                         x[1] = (relative) ? x[0] + dx : dx;
 764                         y[1] = (relative) ? y[0] + dy : dy;
 765
 766                         dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 767                         assert(GetToken(d,token,i,delims) == ",");
 768                         dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 769
 770                         x[2] = (relative) ? x[0] + dx : dx;
 771                         y[2] = (relative) ? y[0] + dy : dy;
 772
 773                         if (command != "q" && command != "Q")
 774                         {
 775                                 dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 776                                 assert(GetToken(d,token,i,delims) == ",");
 777                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 778                                 x[3] = (relative) ? x[0] + dx : dx;
 779                                 y[3] = (relative) ? y[0] + dy : dy;
 780                         }
 781                         else
 782                         {
 783                                 x[3] = x[2];
 784                                 y[3] = y[2];
 785                                 Real old_x1(x[1]), old_y1(y[1]);
 786                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 787                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 788                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 789                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 790                         }
 791
 792                         Real x3(x[3]);
 793                         Real y3(y[3]);
 794                         for (int j = 0; j < 4; ++j)
 795                                 TransformXYPair(x[j],y[j], transform);
 796
 797                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 798
 799                         //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]));
 800
 801                         x[0] = x3;
 802                         y[0] = y3;
 803
 804
 805                 }
 806                 else if (command == "l" || command == "L" || command == "h" || command == "H" || command == "v" || command == "V")
 807                 {
 808                         //Debug("Construct lineto command, relative %d", relative);
 809
 810                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 811                         Real dy;
 812                         if (command == "l" || command == "L")
 813                         {
 814                                 assert(GetToken(d,token,i,delims) == ",");
 815                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 816                         }
 817                         else if (command == "v" || command == "V")
 818                         {
 819                                 swap(dx,dy);
 820                         }
 821
 822                         x[1] = (relative) ? x[0] + dx : dx;
 823                         y[1] = (relative) ? y[0] + dy : dy;
 824                         if (command == "v" || command == "V")
 825                         {
 826                                 x[1] = x[0];
 827                         }
 828                         else if (command == "h" || command == "H")
 829                         {
 830                                 y[1] = y[0];
 831                         }
 832
 833                         Real x1(x[1]);
 834                         Real y1(y[1]);
 835
 836                         TransformXYPair(x[0],y[0],transform);
 837                         TransformXYPair(x[1],y[1],transform);
 838
 839
 840                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
 841
 842                         //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 843
 844                         x[0] = x1;
 845                         y[0] = y1;
 846
 847                 }
 848                 else if (command == "z" || command == "Z")
 849                 {
 850                         //Debug("Construct returnto command");
 851                         x[1] = x0;
 852                         y[1] = y0;
 853                         x[2] = x0;
 854                         y[2] = y0;
 855                         x[3] = x0;
 856                         y[3] = y0;
 857
 858                         Real x3(x[3]);
 859                         Real y3(y[3]);
 860                         for (int j = 0; j < 4; ++j)
 861                                 TransformXYPair(x[j],y[j], transform);
 862
 863                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 864                         //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 865
 866                         x[0] = x3;
 867                         y[0] = y3;
 868                         command = "m";
 869                         closed = true;
 870                 }
 871                 else
 872                 {
 873                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 874                         command = "m";
 875                 }
 876
 877                 if (!start)
 878                 {
 879                         x0 = x[0];
 880                         y0 = y[0];
 881                         start = true;
 882                 }
 883                 prev_i = i;
 884         }
 885         return range;
 886 }
 887
 888 void Document::SetFont(const string & font_filename)
 889 {
 890         if (m_font_data != NULL)
 891         {
 892                 free(m_font_data);
 893         }
 894
 895         FILE *font_file = fopen(font_filename.c_str(), "rb");
 896         fseek(font_file, 0, SEEK_END);
 897         size_t font_file_size = ftell(font_file);
 898         fseek(font_file, 0, SEEK_SET);
 899         m_font_data = (unsigned char*)malloc(font_file_size);
 900         size_t read = fread(m_font_data, 1, font_file_size, font_file);
 901         if (read != font_file_size)
 902         {
 903                 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
 904         }
 905         fclose(font_file);
 906         stbtt_InitFont(&m_font, m_font_data, 0);
 907 }
 908
 909 void Document::AddText(const string & text, Real scale, Real x, Real y)
 910 {
 911         if (m_font_data == NULL)
 912         {
 913                 Warn("No font loaded");
 914                 return;
 915         }
 916
 917         Real x0(x);
 918         //Real y0(y);
 919         int ascent = 0, descent = 0, line_gap = 0;
 920         stbtt_GetFontVMetrics(&m_font, &ascent, &descent, &line_gap);
 921         float font_scale = scale / (float)(ascent - descent);
 922         Real y_advance = Real(font_scale) * Real(ascent - descent + line_gap);
 923         for (unsigned i = 0; i < text.size(); ++i)
 924         {
 925                 if (text[i] == '\n')
 926                 {
 927                         y += y_advance;
 928                         x = x0;
 929                 }
 930                 if (!isprint(text[i]))
 931                         continue;
 932
 933                 int advance_width = 0, left_side_bearing = 0, kerning = 0;
 934                 stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
 935                 if (i >= 1)
 936                 {
 937                         kerning = stbtt_GetCodepointKernAdvance(&m_font, text[i-1], text[i]);
 938                 }
 939                 x += Real(font_scale) * Real(kerning);
 940                 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
 941                 x += Real(font_scale) * Real(advance_width);
 942         }
 943 }
 944
 945 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 946 {
 947         int glyph_index = stbtt_FindGlyphIndex(font, character);
 948
 949         // Check if there is actully a glyph to render.
 950         if (stbtt_IsGlyphEmpty(font, glyph_index))
 951         {
 952                 return;
 953         }
 954
 955         stbtt_vertex *instructions;
 956         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 957
 958         Real current_x(0), current_y(0);
 959         unsigned start_index = m_count;
 960         unsigned end_index = m_count;
 961         for (int i = 0; i < num_instructions; ++i)
 962         {
 963                 // TTF uses 16-bit signed ints for coordinates:
 964                 // with the y-axis inverted compared to us.
 965                 // Convert and scale any data.
 966                 Real inst_x = Real(instructions[i].x)*scale;
 967                 Real inst_y = Real(instructions[i].y)*-scale;
 968                 Real inst_cx = Real(instructions[i].cx)*scale;
 969                 Real inst_cy = Real(instructions[i].cy)*-scale;
 970                 Real old_x(current_x), old_y(current_y);
 971                 current_x = inst_x;
 972                 current_y = inst_y;
 973
 974                 switch(instructions[i].type)
 975                 {
 976                 // Move To
 977                 case STBTT_vmove:
 978                         break;
 979                 // Line To
 980                 case STBTT_vline:
 981                         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));
 982                         break;
 983                 // Quadratic Bezier To:
 984                 case STBTT_vcurve:
 985                         // Quadratic -> Cubic:
 986                         // - Endpoints are the same.
 987                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
 988                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
 989                         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,
 990                                                 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));
 991                         break;
 992                 }
 993         }
 994
 995         if (start_index < m_count && end_index < m_count)
 996         {
 997                 AddPath(start_index, end_index);
 998         }
 999         Debug("Added Glyph \"%c\" at %f %f, scale %f", (char)character, Float(x), Float(y), Float(scale));
1000
1001         stbtt_FreeShape(font, instructions);
1002 }