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                 // If we're entirely within the quadtree node, no clipping need occur.
 136                 if (ContainedInQuadChild(m_objects.bounds[object_id], type))
 137                 {
 138                         m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 139                         m_objects.types.push_back(m_objects.types[object_id]);
 140                         m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 141                         return 1;
 142                 }
 143                 Rect clip_bezier_bounds = TransformRectCoordinates(m_objects.bounds[object_id], TransformFromQuadChild(Rect{0,0,1,1}, type));
 144                 std::vector<Bezier> new_curves = m_objects.beziers[m_objects.data_indices[object_id]].ClipToRectangle(clip_bezier_bounds);
 145                 for (size_t i = 0; i < new_curves.size(); ++i)
 146                 {
 147                         Rect new_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 148                         Bezier new_curve_data = new_curves[i].ToAbsolute(TransformToQuadChild(m_objects.bounds[object_id],type));
 149                         new_bounds = new_curve_data.SolveBounds();
 150                         new_curve_data = new_curve_data.ToRelative(new_bounds);
 151                         unsigned index = AddBezierData(new_curve_data);
 152                         m_objects.bounds.push_back(new_bounds);
 153                         m_objects.types.push_back(BEZIER);
 154                         m_objects.data_indices.push_back(index);
 155                 }
 156                 return new_curves.size();
 157                 }
 158         default:
 159                 Debug("Adding %s -> %s", m_objects.bounds[object_id].Str().c_str(), TransformToQuadChild(m_objects.bounds[object_id], type).Str().c_str());
 160                 m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 161                 m_objects.types.push_back(m_objects.types[object_id]);
 162                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 163                 return 1;
 164         }
 165         return 0;
 166 }
 167 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 168 {
 169         QuadTreeIndex new_index = m_quadtree.nodes.size();
 170         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 171
 172         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 173         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 174         {
 175                 if (IntersectsQuadChild(m_objects.bounds[i], type))
 176                 {
 177                         m_count += ClipObjectToQuadChild(i, type);
 178                 }
 179         }
 180         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 181         switch (type)
 182         {
 183                 case QTC_TOP_LEFT:
 184                         m_quadtree.nodes[parent].top_left = new_index;
 185                         break;
 186                 case QTC_TOP_RIGHT:
 187                         m_quadtree.nodes[parent].top_right = new_index;
 188                         break;
 189                 case QTC_BOTTOM_LEFT:
 190                         m_quadtree.nodes[parent].bottom_left = new_index;
 191                         break;
 192                 case QTC_BOTTOM_RIGHT:
 193                         m_quadtree.nodes[parent].bottom_right = new_index;
 194                         break;
 195                 default:
 196                         Fatal("Tried to add a QuadTree child of invalid type!");
 197         }
 198         return new_index;
 199 }
 200
 201 // Reparent a quadtree node, making it the "type" child of a new node.
 202 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 203 {
 204         QuadTreeIndex new_index = m_quadtree.nodes.size();
 205         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
 206
 207         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 208         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 209         {
 210                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 211                 m_objects.types.push_back(m_objects.types[i]);
 212                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 213                 m_count++;
 214         }
 215         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 216         switch (type)
 217         {
 218                 case QTC_TOP_LEFT:
 219                         m_quadtree.nodes[new_index].top_left = child;
 220                         break;
 221                 case QTC_TOP_RIGHT:
 222                         m_quadtree.nodes[new_index].top_right = child;
 223                         break;
 224                 case QTC_BOTTOM_LEFT:
 225                         m_quadtree.nodes[new_index].bottom_left = child;
 226                         break;
 227                 case QTC_BOTTOM_RIGHT:
 228                         m_quadtree.nodes[new_index].bottom_right = child;
 229                         break;
 230                 default:
 231                         Fatal("Tried to add a QuadTree child of invalid type!");
 232         }
 233         return new_index;
 234 }
 235
 236 #endif
 237
 238 void Document::Load(const string & filename)
 239 {
 240         m_objects.bounds.clear();
 241         m_count = 0;
 242         if (filename == "")
 243         {
 244                 Debug("Loaded empty document.");
 245                 return;
 246         }
 247         Debug("Loading document from file \"%s\"", filename.c_str());
 248         FILE * file = fopen(filename.c_str(), "r");
 249         if (file == NULL)
 250                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 251
 252         size_t read;
 253
 254         DocChunkTypes chunk_type;
 255         uint32_t chunk_size;
 256         while (ReadChunkHeader(file, chunk_type, chunk_size))
 257         {
 258                 switch(chunk_type)
 259                 {
 260                 case CT_NUMOBJS:
 261                         read = fread(&m_count, sizeof(m_count), 1, file);
 262                         if (read != 1)
 263                                 Fatal("Failed to read number of objects!");
 264                         Debug("Number of objects: %u", ObjectCount());
 265                         break;
 266                 case CT_OBJTYPES:
 267                         Debug("Object types...");
 268                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 269                         break;
 270                 case CT_OBJBOUNDS:
 271                         Debug("Object bounds...");
 272                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 273                         break;
 274                 case CT_OBJINDICES:
 275                         Debug("Object data indices...");
 276                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 277                         break;
 278                 case CT_OBJBEZIERS:
 279                         Debug("Bezier data...");
 280                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 281                         break;
 282
 283                 case CT_OBJPATHS:
 284                         Debug("Path data...");
 285                         Warn("Not handled because lazy");
 286                         break;
 287                 }
 288         }
 289         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 290 #ifndef QUADTREE_DISABLED
 291         if (m_quadtree.root_id == QUADTREE_EMPTY)
 292         {
 293                 GenBaseQuadtree();
 294         }
 295 #endif
 296 }
 297
 298 unsigned Document::AddPath(unsigned start_index, unsigned end_index, const Colour & fill, const Colour & stroke)
 299 {
 300         Path path(m_objects, start_index, end_index, fill, stroke);
 301         unsigned data_index = AddPathData(path);
 302         Rect bounds = path.SolveBounds(m_objects);
 303         unsigned result = Add(PATH, bounds,data_index);
 304         //Debug("Added path %u -> %u (%u objects) colour {%u,%u,%u,%u}, stroke {%u,%u,%u,%u}", start_index, end_index, (end_index - start_index), fill.r, fill.g, fill.b, fill.a, stroke.r, stroke.g, stroke.b, stroke.a);
 305         return result;
 306 }
 307
 308 /**
 309  * Add a Bezier using Absolute coords
 310  */
 311 unsigned Document::AddBezier(const Bezier & bezier)
 312 {
 313         Rect bounds = bezier.SolveBounds();
 314         Bezier data = bezier.ToRelative(bounds); // Relative
 315         if (data.ToAbsolute(bounds) != bezier)
 316         {
 317                 Warn("%s != %s", data.ToAbsolute(Rect(0,0,1,1)).Str().c_str(),
 318                         bezier.Str().c_str());
 319                 Warn("ToAbsolute on ToRelative does not give original Bezier");
 320         }
 321         unsigned index = AddBezierData(data);
 322         return Add(BEZIER, bounds, index);
 323 }
 324
 325 unsigned Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 326 {
 327         m_objects.types.push_back(type);
 328         m_objects.bounds.push_back(bounds);
 329         m_objects.data_indices.push_back(data_index);
 330         return (m_count++); // Why can't we just use the size of types or something?
 331 }
 332
 333 unsigned Document::AddBezierData(const Bezier & bezier)
 334 {
 335         m_objects.beziers.push_back(bezier);
 336         return m_objects.beziers.size()-1;
 337 }
 338
 339 unsigned Document::AddPathData(const Path & path)
 340 {
 341         m_objects.paths.push_back(path);
 342         return m_objects.paths.size()-1;
 343 }
 344
 345 void Document::DebugDumpObjects()
 346 {
 347         Debug("Objects for Document %p are:", this);
 348         for (unsigned id = 0; id < ObjectCount(); ++id)
 349         {
 350                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 351         }
 352 }
 353
 354 bool Document::operator==(const Document & equ) const
 355 {
 356         return (ObjectCount() == equ.ObjectCount()
 357                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 358                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 359                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 360 }
 361
 362
 363
 364 // Behold my amazing tokenizing abilities
 365 static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
 366 {
 367         token.clear();
 368         while (i < d.size() && iswspace(d[i]))
 369         {
 370                 ++i;
 371         }
 372
 373         while (i < d.size())
 374         {
 375                 if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
 376                 {
 377                         if (token.size() == 0 && !iswspace(d[i]))
 378                         {
 379                                 token += d[i++];
 380                         }
 381                         break;
 382                 }
 383                 token += d[i++];
 384         }
 385         //Debug("Got token \"%s\"", token.c_str());
 386         return token;
 387 }
 388
 389 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
 390 {
 391         string token("");
 392         while (GetToken(d, token, i, delims) == ",");
 393         x = strtod(token.c_str(),NULL);
 394         if (GetToken(d, token, i, delims) != ",")
 395         {
 396                 Fatal("Expected \",\" seperating x,y pair");
 397         }
 398         y = strtod(GetToken(d, token, i, delims).c_str(),NULL);
 399 }
 400
 401 static bool GetKeyValuePair(const string & d, string & key, string & value, unsigned & i, const string & delims = "()[],{}<>;:=")
 402 {
 403         key = "";
 404         string token;
 405         while (GetToken(d, token, i, delims) == ":" || token == ";");
 406         key = token;
 407         if (GetToken(d, token, i, delims) != ":")
 408         {
 409                 Error("Expected \":\" seperating key:value pair");
 410                 return false;
 411         }
 412         value = "";
 413         GetToken(d, value, i, delims);
 414         return true;
 415 }
 416
 417 static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
 418 {
 419         Real x0(x);
 420         x = transform.a * x + transform.c * y + transform.e;
 421         y = transform.b * x0 + transform.d * y + transform.f;
 422 }
 423
 424 void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
 425 {
 426         //Debug("Parsing transform %s", s.c_str());
 427         string token;
 428         string command;
 429         unsigned i = 0;
 430
 431         while (i < s.size())
 432         {
 433                 GetToken(s, command, i);
 434                 if (command == "," || command == "" || command == ":")
 435                 {
 436                         if (i < s.size())
 437                                 GetToken(s, command, i);
 438                         else
 439                                 return;
 440                 }
 441                 //Debug("Token is \"%s\"", command.c_str());
 442
 443                 SVGMatrix delta = {1,0,0,0,1,0};
 444
 445
 446                 assert(GetToken(s,token, i) == "(");
 447                 if (command == "translate")
 448                 {
 449                         GetXYPair(s, delta.e, delta.f, i);
 450                         assert(GetToken(s,token, i) == ")");
 451                 }
 452                 else if (command == "matrix")
 453                 {
 454                         GetXYPair(s, delta.a, delta.b,i);
 455                         GetXYPair(s, delta.c, delta.d,i);
 456                         GetXYPair(s, delta.e, delta.f,i);
 457                         assert(GetToken(s,token, i) == ")");
 458                 }
 459                 else if (command == "scale")
 460                 {
 461                         delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
 462                         GetToken(s, token, i);
 463                         if (token == ",")
 464                         {
 465                                 delta.d = (strtod(GetToken(s,token,i).c_str(), NULL));
 466                                 assert(GetToken(s, token, i) == ")");
 467                         }
 468                         else
 469                         {
 470                                 delta.d = delta.a;
 471                                 assert(token == ")");
 472                         }
 473
 474                 }
 475                 else
 476                 {
 477                         Warn("Unrecognised transform \"%s\", using identity", command.c_str());
 478                 }
 479
 480                 //Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 481                 //Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
 482
 483                 SVGMatrix old(transform);
 484                 transform.a = old.a * delta.a + old.c * delta.b;
 485                 transform.c = old.a * delta.c + old.c * delta.d;
 486                 transform.e = old.a * delta.e + old.c * delta.f + old.e;
 487
 488                 transform.b = old.b * delta.a + old.d * delta.b;
 489                 transform.d = old.b * delta.c + old.d * delta.d;
 490                 transform.f = old.b * delta.e + old.d * delta.f + old.f;
 491
 492                 //Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 493         }
 494 }
 495
 496 inline Colour ParseColourString(const string & colour_str)
 497 {
 498         Colour c(0,0,0,0);
 499         if (colour_str == "red")
 500                 c = {255,0,0,255};
 501         else if (colour_str == "blue")
 502                 c = {0,0,255,255};
 503         else if (colour_str == "green")
 504                 c = {0,255,0,255};
 505         else if (colour_str == "black")
 506                 c = {0,0,0,255};
 507         else if (colour_str == "white")
 508                 c = {255,255,255,255};
 509         else if (colour_str.size() == 7 && colour_str[0] == '#')
 510         {
 511                 Debug("Parse colour string: \"%s\"", colour_str.c_str());
 512                 char comp[3] = {colour_str[1], colour_str[2], '\0'};
 513                 c.r = strtoul(comp, NULL, 16);
 514                 comp[0] = colour_str[3]; comp[1] = colour_str[4];
 515                 c.g = strtoul(comp, NULL, 16);
 516                 comp[0] = colour_str[5]; comp[1] = colour_str[6];
 517                 c.b = strtoul(comp, NULL, 16);
 518                 c.a = 255;
 519                 Debug("Colour is: %u, %u, %u, %u", c.r, c.g, c.b, c.a);
 520         }
 521         return c;
 522 }
 523
 524 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
 525 {
 526         //Debug("Parse node <%s>", root.name());
 527
 528
 529         for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
 530         {
 531                 SVGMatrix transform(parent_transform);
 532                 pugi::xml_attribute attrib_trans = child.attribute("transform");
 533                 if (!attrib_trans.empty())
 534                 {
 535                         ParseSVGTransform(attrib_trans.as_string(), transform);
 536                 }
 537
 538
 539
 540                 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
 541                         || strcmp(child.name(), "group") == 0)
 542                 {
 543
 544                         ParseSVGNode(child, transform);
 545                         continue;
 546                 }
 547                 else if (strcmp(child.name(), "path") == 0)
 548                 {
 549                         string d = child.attribute("d").as_string();
 550                         //Debug("Path data attribute is \"%s\"", d.c_str());
 551                         bool closed = false;
 552                         pair<unsigned, unsigned> range = ParseSVGPathData(d, transform, closed);
 553                         if (true)//(closed)
 554                         {
 555
 556                                 string colour_str("");
 557                                 map<string, string> style;
 558                                 if (child.attribute("style"))
 559                                 {
 560                                         ParseSVGStyleData(child.attribute("style").as_string(), style);
 561                                 }
 562
 563                                 // Determine shading colour
 564                                 if (child.attribute("fill"))
 565                                 {
 566                                         colour_str = child.attribute("fill").as_string();
 567                                 }
 568                                 else if (style.find("fill") != style.end())
 569                                 {
 570                                         colour_str = style["fill"];
 571                                 }
 572                                 Colour fill = ParseColourString(colour_str);
 573                                 Colour stroke = fill;
 574
 575                                 if (child.attribute("stroke"))
 576                                 {
 577                                         colour_str = child.attribute("stroke").as_string();
 578                                         stroke = ParseColourString(colour_str);
 579                                 }
 580                                 else if (style.find("stroke") != style.end())
 581                                 {
 582                                         colour_str = style["stroke"];
 583                                         stroke = ParseColourString(colour_str);
 584                                 }
 585
 586
 587                                 // Determin shading alpha
 588                                 if (child.attribute("fill-opacity"))
 589                                 {
 590                                         fill.a = 255*child.attribute("fill-opacity").as_float();
 591                                 }
 592                                 else if (style.find("fill-opacity") != style.end())
 593                                 {
 594                                         fill.a = 255*strtod(style["fill-opacity"].c_str(), NULL);
 595                                 }
 596                                 if (child.attribute("stroke-opacity"))
 597                                 {
 598                                         stroke.a = 255*child.attribute("stroke-opacity").as_float();
 599                                 }
 600                                 else if (style.find("stroke-opacity") != style.end())
 601                                 {
 602                                         stroke.a = 255*strtod(style["stroke-opacity"].c_str(), NULL);
 603                                 }
 604                                 AddPath(range.first, range.second, fill, stroke);
 605                         }
 606
 607                 }
 608                 else if (strcmp(child.name(), "line") == 0)
 609                 {
 610                         Real x0(child.attribute("x1").as_float());
 611                         Real y0(child.attribute("y1").as_float());
 612                         Real x1(child.attribute("x2").as_float());
 613                         Real y1(child.attribute("y2").as_float());
 614                         TransformXYPair(x0,y0,transform);
 615                         TransformXYPair(x1,y1,transform);
 616                         AddBezier(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
 617                 }
 618                 else if (strcmp(child.name(), "rect") == 0)
 619                 {
 620                         Real coords[4];
 621                         const char * attrib_names[] = {"x", "y", "width", "height"};
 622                         for (size_t i = 0; i < 4; ++i)
 623                                 coords[i] = child.attribute(attrib_names[i]).as_float();
 624
 625                         Real x2(coords[0]+coords[2]);
 626                         Real y2(coords[1]+coords[3]);
 627                         TransformXYPair(coords[0],coords[1],transform); // x, y, transform
 628                         TransformXYPair(x2,y2,transform);
 629                         coords[2] = x2 - coords[0];
 630                         coords[3] = y2 - coords[1];
 631
 632                         bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
 633                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
 634                 }
 635                 else if (strcmp(child.name(), "circle") == 0)
 636                 {
 637                         Real cx = child.attribute("cx").as_float();
 638                         Real cy = child.attribute("cy").as_float();
 639                         Real r = child.attribute("r").as_float();
 640
 641                         Real x = (cx - r);
 642                         Real y = (cy - r);
 643                         TransformXYPair(x,y,transform);
 644                         Real w = Real(2)*r*transform.a; // width scales
 645                         Real h = Real(2)*r*transform.d; // height scales
 646
 647
 648                         Rect rect(x,y,w,h);
 649                         Add(CIRCLE_FILLED, rect,0);
 650                         Debug("Added Circle %s", rect.Str().c_str());
 651                 }
 652                 else if (strcmp(child.name(), "text") == 0)
 653                 {
 654                         Real x = child.attribute("x").as_float();
 655                         Real y = child.attribute("y").as_float();
 656                         TransformXYPair(x,y,transform);
 657                         Debug("Add text \"%s\"", child.child_value());
 658                         AddText(child.child_value(), 0.05, x, y);
 659                 }
 660         }
 661 }
 662
 663 void Document::ParseSVGStyleData(const string & style, map<string, string> & results)
 664 {
 665         unsigned i = 0;
 666         string key;
 667         string value;
 668         while (i < style.size() && GetKeyValuePair(style, key, value, i))
 669         {
 670                 results[key] = value;
 671         }
 672 }
 673
 674 /**
 675  * Parse an SVG string into a rectangle
 676  */
 677 void Document::ParseSVG(const string & input, const Rect & bounds)
 678 {
 679         using namespace pugi;
 680
 681         xml_document doc_xml;
 682         xml_parse_result result = doc_xml.load(input.c_str());
 683
 684         if (!result)
 685                 Error("Couldn't parse SVG input - %s", result.description());
 686
 687         Debug("Loaded XML - %s", result.description());
 688         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 689         ParseSVGNode(doc_xml, transform);
 690 }
 691
 692 /**
 693  * Load an SVG into a rectangle
 694  */
 695 void Document::LoadSVG(const string & filename, const Rect & bounds)
 696 {
 697         using namespace pugi;
 698
 699         xml_document doc_xml;
 700         ifstream input(filename.c_str(), ios_base::in);
 701         xml_parse_result result = doc_xml.load(input);
 702
 703         if (!result)
 704                 Error("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 705
 706         Debug("Loaded XML - %s", result.description());
 707
 708         input.close();
 709                                                 // a c e, b d f
 710         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 711         ParseSVGNode(doc_xml, transform);
 712 }
 713
 714
 715
 716 // Fear the wrath of the tokenizing svg data
 717 // Seriously this isn't really very DOM-like at all is it?
 718 pair<unsigned, unsigned> Document::ParseSVGPathData(const string & d, const SVGMatrix & transform, bool & closed)
 719 {
 720         closed = false;
 721         Real x[4] = {0,0,0,0};
 722         Real y[4] = {0,0,0,0};
 723
 724         string token("");
 725         string command("m");
 726
 727         Real x0(0);
 728         Real y0(0);
 729
 730         unsigned i = 0;
 731         unsigned prev_i = 0;
 732
 733         bool start = false;
 734
 735
 736         static string delims("()[],{}<>;:=LlHhVvmMqQzZcC");
 737
 738         pair<unsigned, unsigned> range(m_count, m_count);
 739
 740         while (i < d.size() && GetToken(d, token, i, delims).size() > 0)
 741         {
 742                 if (isalpha(token[0]))
 743                         command = token;
 744                 else
 745                 {
 746                         i = prev_i; // hax
 747                         if(command == "")
 748                                 command = "L";
 749                 }
 750
 751                 bool relative = islower(command[0]);
 752
 753                 if (command == "m" || command == "M")
 754                 {
 755                         //Debug("Construct moveto command");
 756                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 757                         assert(GetToken(d,token,i,delims) == ",");
 758                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 759
 760                         x[0] = (relative) ? x[0] + dx : dx;
 761                         y[0] = (relative) ? y[0] + dy : dy;
 762
 763                         x0 = x[0];
 764                         y0 = y[0];
 765                         //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 766                         command = (command == "m") ? "l" : "L";
 767                 }
 768                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 769                 {
 770                         //Debug("Construct curveto command");
 771                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 772                         assert(GetToken(d,token,i,delims) == ",");
 773                         Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 774
 775                         x[1] = (relative) ? x[0] + dx : dx;
 776                         y[1] = (relative) ? y[0] + dy : dy;
 777
 778                         dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 779                         assert(GetToken(d,token,i,delims) == ",");
 780                         dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 781
 782                         x[2] = (relative) ? x[0] + dx : dx;
 783                         y[2] = (relative) ? y[0] + dy : dy;
 784
 785                         if (command != "q" && command != "Q")
 786                         {
 787                                 dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 788                                 assert(GetToken(d,token,i,delims) == ",");
 789                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 790                                 x[3] = (relative) ? x[0] + dx : dx;
 791                                 y[3] = (relative) ? y[0] + dy : dy;
 792                         }
 793                         else
 794                         {
 795                                 x[3] = x[2];
 796                                 y[3] = y[2];
 797                                 Real old_x1(x[1]), old_y1(y[1]);
 798                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 799                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 800                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 801                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 802                         }
 803
 804                         Real x3(x[3]);
 805                         Real y3(y[3]);
 806                         for (int j = 0; j < 4; ++j)
 807                                 TransformXYPair(x[j],y[j], transform);
 808
 809                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 810
 811                         //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]));
 812
 813                         x[0] = x3;
 814                         y[0] = y3;
 815
 816
 817                 }
 818                 else if (command == "l" || command == "L" || command == "h" || command == "H" || command == "v" || command == "V")
 819                 {
 820                         //Debug("Construct lineto command, relative %d", relative);
 821
 822                         Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 823                         Real dy;
 824                         if (command == "l" || command == "L")
 825                         {
 826                                 assert(GetToken(d,token,i,delims) == ",");
 827                                 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
 828                         }
 829                         else if (command == "v" || command == "V")
 830                         {
 831                                 swap(dx,dy);
 832                         }
 833
 834                         x[1] = (relative) ? x[0] + dx : dx;
 835                         y[1] = (relative) ? y[0] + dy : dy;
 836                         if (command == "v" || command == "V")
 837                         {
 838                                 x[1] = x[0];
 839                         }
 840                         else if (command == "h" || command == "H")
 841                         {
 842                                 y[1] = y[0];
 843                         }
 844
 845                         Real x1(x[1]);
 846                         Real y1(y[1]);
 847
 848                         TransformXYPair(x[0],y[0],transform);
 849                         TransformXYPair(x[1],y[1],transform);
 850
 851
 852                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
 853
 854                         //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 855
 856                         x[0] = x1;
 857                         y[0] = y1;
 858
 859                 }
 860                 else if (command == "z" || command == "Z")
 861                 {
 862                         //Debug("Construct returnto command");
 863                         x[1] = x0;
 864                         y[1] = y0;
 865                         x[2] = x0;
 866                         y[2] = y0;
 867                         x[3] = x0;
 868                         y[3] = y0;
 869
 870                         Real x3(x[3]);
 871                         Real y3(y[3]);
 872                         for (int j = 0; j < 4; ++j)
 873                                 TransformXYPair(x[j],y[j], transform);
 874
 875                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 876                         //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 877
 878                         x[0] = x3;
 879                         y[0] = y3;
 880                         command = "m";
 881                         closed = true;
 882                 }
 883                 else
 884                 {
 885                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 886                         command = "m";
 887                 }
 888
 889                 if (!start)
 890                 {
 891                         x0 = x[0];
 892                         y0 = y[0];
 893                         start = true;
 894                 }
 895                 prev_i = i;
 896         }
 897         return range;
 898 }
 899
 900 void Document::SetFont(const string & font_filename)
 901 {
 902         if (m_font_data != NULL)
 903         {
 904                 free(m_font_data);
 905         }
 906
 907         FILE *font_file = fopen(font_filename.c_str(), "rb");
 908         fseek(font_file, 0, SEEK_END);
 909         size_t font_file_size = ftell(font_file);
 910         fseek(font_file, 0, SEEK_SET);
 911         m_font_data = (unsigned char*)malloc(font_file_size);
 912         size_t read = fread(m_font_data, 1, font_file_size, font_file);
 913         if (read != font_file_size)
 914         {
 915                 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
 916         }
 917         fclose(font_file);
 918         stbtt_InitFont(&m_font, m_font_data, 0);
 919 }
 920
 921 void Document::AddText(const string & text, Real scale, Real x, Real y)
 922 {
 923         if (m_font_data == NULL)
 924         {
 925                 Warn("No font loaded");
 926                 return;
 927         }
 928
 929         Real x0(x);
 930         //Real y0(y);
 931         int ascent = 0, descent = 0, line_gap = 0;
 932         stbtt_GetFontVMetrics(&m_font, &ascent, &descent, &line_gap);
 933         Real font_scale = scale;
 934         font_scale /= Real(ascent - descent);
 935         Real y_advance = Real(font_scale) * Real(ascent - descent + line_gap);
 936         for (unsigned i = 0; i < text.size(); ++i)
 937         {
 938                 if (text[i] == '\n')
 939                 {
 940                         y += y_advance;
 941                         x = x0;
 942                 }
 943                 if (!isprint(text[i]))
 944                         continue;
 945
 946                 int advance_width = 0, left_side_bearing = 0, kerning = 0;
 947                 stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
 948                 if (i >= 1)
 949                 {
 950                         kerning = stbtt_GetCodepointKernAdvance(&m_font, text[i-1], text[i]);
 951                 }
 952                 x += font_scale * Real(kerning);
 953                 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
 954                 x += font_scale * Real(advance_width);
 955         }
 956 }
 957
 958 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 959 {
 960         int glyph_index = stbtt_FindGlyphIndex(font, character);
 961
 962         // Check if there is actully a glyph to render.
 963         if (stbtt_IsGlyphEmpty(font, glyph_index))
 964         {
 965                 return;
 966         }
 967
 968         stbtt_vertex *instructions;
 969         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 970
 971         Real current_x(0), current_y(0);
 972         unsigned start_index = m_count;
 973         unsigned end_index = m_count;
 974         for (int i = 0; i < num_instructions; ++i)
 975         {
 976                 // TTF uses 16-bit signed ints for coordinates:
 977                 // with the y-axis inverted compared to us.
 978                 // Convert and scale any data.
 979                 Real inst_x = Real(instructions[i].x)*scale;
 980                 Real inst_y = Real(instructions[i].y)*-scale;
 981                 Real inst_cx = Real(instructions[i].cx)*scale;
 982                 Real inst_cy = Real(instructions[i].cy)*-scale;
 983                 Real old_x(current_x), old_y(current_y);
 984                 current_x = inst_x;
 985                 current_y = inst_y;
 986
 987                 switch(instructions[i].type)
 988                 {
 989                 // Move To
 990                 case STBTT_vmove:
 991                         break;
 992                 // Line To
 993                 case STBTT_vline:
 994                         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));
 995                         break;
 996                 // Quadratic Bezier To:
 997                 case STBTT_vcurve:
 998                         // Quadratic -> Cubic:
 999                         // - Endpoints are the same.
1000                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
1001                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
1002                         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,
1003                                                 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));
1004                         break;
1005                 }
1006         }
1007
1008         if (start_index < m_count && end_index < m_count)
1009         {
1010                 AddPath(start_index, end_index);
1011         }
1012         //Debug("Added Glyph \"%c\" at %f %f, scale %f", (char)character, Float(x), Float(y), Float(scale));
1013
1014         stbtt_FreeShape(font, instructions);
1015 }