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 #include "transformationtype.h"
   8
   9 #include "stb_truetype.h"
  10
  11 using namespace IPDF;
  12 using namespace std;
  13
  14 //TODO: Make this work for variable sized Reals
  15
  16 // Loads an std::vector<T> of size num_elements from a file.
  17 template<typename T>
  18 static void LoadStructVector(FILE *src_file, size_t num_elems, std::vector<T>& dest)
  19 {
  20         size_t structsread = 0;
  21         dest.resize(num_elems);
  22         structsread = fread(dest.data(), sizeof(T), num_elems, src_file);
  23         if (structsread != num_elems)
  24                 Fatal("Only read %u structs (expected %u)!", structsread, num_elems);
  25 }
  26
  27 // Saves an std::vector<T> to a file. Size must be saves separately.
  28 template<typename T>
  29 static void SaveStructVector(FILE *dst_file, std::vector<T>& src)
  30 {
  31         size_t written = 0;
  32         written = fwrite(src.data(), sizeof(T), src.size(), dst_file);
  33         if (written != src.size())
  34                 Fatal("Only wrote %u structs (expected %u)!", written, src.size());
  35 }
  36
  37 static void WriteChunkHeader(FILE *dst_file, DocChunkTypes type, uint32_t size)
  38 {
  39         size_t written = 0;
  40         written = fwrite(&type, sizeof(type), 1, dst_file);
  41         if (written != 1)
  42                 Fatal("Could not write Chunk header! (ID)");
  43         written = fwrite(&size, sizeof(size), 1, dst_file);
  44         if (written != 1)
  45                 Fatal("Could not write Chunk header (size)!");
  46 }
  47
  48 static bool ReadChunkHeader(FILE *src_file, DocChunkTypes& type, uint32_t& size)
  49 {
  50         if (fread(&type, sizeof(DocChunkTypes), 1, src_file) != 1)
  51                 return false;
  52         if (fread(&size, sizeof(uint32_t), 1, src_file) != 1)
  53                 return false;
  54         return true;
  55 }
  56
  57 void Document::Save(const string & filename)
  58 {
  59         Debug("Saving document to file \"%s\"...", filename.c_str());
  60         FILE * file = fopen(filename.c_str(), "w");
  61         if (file == NULL)
  62                 Fatal("Couldn't open file \"%s\" - %s", filename.c_str(), strerror(errno));
  63
  64         size_t written;
  65         Debug("Number of objects (%u)...", ObjectCount());
  66         WriteChunkHeader(file, CT_NUMOBJS, sizeof(m_count));
  67         written = fwrite(&m_count, sizeof(m_count), 1, file);
  68         if (written != 1)
  69                 Fatal("Failed to write number of objects!");
  70
  71         Debug("Object types...");
  72         WriteChunkHeader(file, CT_OBJTYPES, m_objects.types.size() * sizeof(ObjectType));
  73         SaveStructVector<ObjectType>(file, m_objects.types);
  74
  75         Debug("Object bounds...");
  76         WriteChunkHeader(file, CT_OBJBOUNDS, m_objects.bounds.size() * sizeof(Rect));
  77         SaveStructVector<Rect>(file, m_objects.bounds);
  78
  79         Debug("Object data indices...");
  80         WriteChunkHeader(file, CT_OBJINDICES, m_objects.data_indices.size() * sizeof(unsigned));
  81         SaveStructVector<unsigned>(file, m_objects.data_indices);
  82
  83         Debug("Bezier data...");
  84         WriteChunkHeader(file, CT_OBJBEZIERS, m_objects.beziers.size() * sizeof(uint8_t));
  85         SaveStructVector<Bezier>(file, m_objects.beziers);
  86
  87         int err = fclose(file);
  88         if (err != 0)
  89                 Fatal("Failed to close file \"%s\" - %s", filename.c_str(), strerror(err));
  90
  91         Debug("Successfully saved %u objects to \"%s\"", ObjectCount(), filename.c_str());
  92 }
  93
  94 #ifndef QUADTREE_DISABLED
  95
  96 void Document::GenBaseQuadtree()
  97 {
  98         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QTC_UNKNOWN, 0, ObjectCount(), -1});
  99         m_quadtree.root_id = 0;
 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         case PATH:
 109                 {
 110                 Rect obj_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 111                 if (obj_bounds.x < 0)
 112                 {
 113                         obj_bounds.w += obj_bounds.x;
 114                         obj_bounds.x = 0;
 115                 }
 116                 if (obj_bounds.y < 0)
 117                 {
 118                         obj_bounds.h += obj_bounds.y;
 119                         obj_bounds.y = 0;
 120                 }
 121                 if (obj_bounds.x + obj_bounds.w > 1)
 122                 {
 123                         obj_bounds.w += (1 - (obj_bounds.x + obj_bounds.w));
 124                 }
 125                 if (obj_bounds.y + obj_bounds.h > 1)
 126                 {
 127                         obj_bounds.h += (1 - (obj_bounds.y + obj_bounds.h));
 128                 }
 129                 m_objects.bounds.push_back(obj_bounds);
 130                 m_objects.types.push_back(m_objects.types[object_id]);
 131                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 132                 return 1;
 133                 }
 134         case BEZIER:
 135                 {
 136                 // If we're entirely within the quadtree node, no clipping need occur.
 137                 if (ContainedInQuadChild(m_objects.bounds[object_id], type))
 138                 {
 139                         m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 140                         m_objects.types.push_back(m_objects.types[object_id]);
 141                         m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 142                         return 1;
 143                 }
 144                 Rect clip_bezier_bounds = TransformRectCoordinates(m_objects.bounds[object_id], TransformFromQuadChild(Rect{0,0,1,1}, type));
 145                 std::vector<Bezier> new_curves = m_objects.beziers[m_objects.data_indices[object_id]].ClipToRectangle(clip_bezier_bounds);
 146                 for (size_t i = 0; i < new_curves.size(); ++i)
 147                 {
 148                         Rect new_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
 149                         Bezier new_curve_data = new_curves[i].ToAbsolute(TransformToQuadChild(m_objects.bounds[object_id],type));
 150                         new_bounds = new_curve_data.SolveBounds();
 151                         Debug("New bounds: %s", new_bounds.Str().c_str());
 152                         new_curve_data = new_curve_data.ToRelative(new_bounds);
 153                         unsigned index = AddBezierData(new_curve_data);
 154                         m_objects.bounds.push_back(new_bounds);
 155                         m_objects.types.push_back(BEZIER);
 156                         m_objects.data_indices.push_back(index);
 157                 }
 158                 return new_curves.size();
 159                 }
 160         default:
 161                 Debug("Adding %s -> %s", m_objects.bounds[object_id].Str().c_str(), TransformToQuadChild(m_objects.bounds[object_id], type).Str().c_str());
 162                 m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
 163                 m_objects.types.push_back(m_objects.types[object_id]);
 164                 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
 165                 return 1;
 166         }
 167         return 0;
 168 }
 169 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 170 {
 171         QuadTreeIndex new_index = m_quadtree.nodes.size();
 172         Debug("-------------- Generating Quadtree Node %d (parent %d, type %d) ----------------------", new_index, parent, type);
 173         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0, -1});
 174
 175         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 176         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 177         {
 178                 if (IntersectsQuadChild(m_objects.bounds[i], type))
 179                 {
 180                         m_count += ClipObjectToQuadChild(i, type);
 181                 }
 182         }
 183         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 184         switch (type)
 185         {
 186                 case QTC_TOP_LEFT:
 187                         m_quadtree.nodes[parent].top_left = new_index;
 188                         break;
 189                 case QTC_TOP_RIGHT:
 190                         m_quadtree.nodes[parent].top_right = new_index;
 191                         break;
 192                 case QTC_BOTTOM_LEFT:
 193                         m_quadtree.nodes[parent].bottom_left = new_index;
 194                         break;
 195                 case QTC_BOTTOM_RIGHT:
 196                         m_quadtree.nodes[parent].bottom_right = new_index;
 197                         break;
 198                 default:
 199                         Fatal("Tried to add a QuadTree child of invalid type!");
 200         }
 201         return new_index;
 202 }
 203
 204 // Reparent a quadtree node, making it the "type" child of a new node.
 205 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 206 {
 207         QuadTreeIndex new_index = m_quadtree.nodes.size();
 208         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0, -1});
 209
 210         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 211         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 212         {
 213                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 214                 m_objects.types.push_back(m_objects.types[i]);
 215                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 216                 m_count++;
 217         }
 218         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 219         switch (type)
 220         {
 221                 case QTC_TOP_LEFT:
 222                         m_quadtree.nodes[new_index].top_left = child;
 223                         break;
 224                 case QTC_TOP_RIGHT:
 225                         m_quadtree.nodes[new_index].top_right = child;
 226                         break;
 227                 case QTC_BOTTOM_LEFT:
 228                         m_quadtree.nodes[new_index].bottom_left = child;
 229                         break;
 230                 case QTC_BOTTOM_RIGHT:
 231                         m_quadtree.nodes[new_index].bottom_right = child;
 232                         break;
 233                 default:
 234                         Fatal("Tried to add a QuadTree child of invalid type!");
 235         }
 236         return new_index;
 237 }
 238
 239 #endif
 240
 241 void Document::Load(const string & filename)
 242 {
 243         m_objects.bounds.clear();
 244         m_count = 0;
 245         if (filename == "")
 246         {
 247                 Debug("Loaded empty document.");
 248                 return;
 249         }
 250         Debug("Loading document from file \"%s\"", filename.c_str());
 251         FILE * file = fopen(filename.c_str(), "r");
 252         if (file == NULL)
 253                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 254
 255         size_t read;
 256
 257         DocChunkTypes chunk_type;
 258         uint32_t chunk_size;
 259         while (ReadChunkHeader(file, chunk_type, chunk_size))
 260         {
 261                 switch(chunk_type)
 262                 {
 263                 case CT_NUMOBJS:
 264                         read = fread(&m_count, sizeof(m_count), 1, file);
 265                         if (read != 1)
 266                                 Fatal("Failed to read number of objects!");
 267                         Debug("Number of objects: %u", ObjectCount());
 268                         break;
 269                 case CT_OBJTYPES:
 270                         Debug("Object types...");
 271                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 272                         break;
 273                 case CT_OBJBOUNDS:
 274                         Debug("Object bounds...");
 275                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 276                         break;
 277                 case CT_OBJINDICES:
 278                         Debug("Object data indices...");
 279                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 280                         break;
 281                 case CT_OBJBEZIERS:
 282                         Debug("Bezier data...");
 283                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 284                         break;
 285
 286                 case CT_OBJPATHS:
 287                         Debug("Path data...");
 288                         Warn("Not handled because lazy");
 289                         break;
 290                 }
 291         }
 292         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 293 #ifndef QUADTREE_DISABLED
 294         if (m_quadtree.root_id == QUADTREE_EMPTY)
 295         {
 296                 GenBaseQuadtree();
 297         }
 298 #endif
 299 }
 300
 301 unsigned Document::AddPath(unsigned start_index, unsigned end_index, const Colour & fill, const Colour & stroke)
 302 {
 303         Path path(m_objects, start_index, end_index, fill, stroke);
 304         unsigned data_index = AddPathData(path);
 305         Rect bounds = path.SolveBounds(m_objects);
 306         unsigned result = Add(PATH, bounds,data_index);
 307         m_objects.paths[data_index].m_index = result;
 308         //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);
 309         return result;
 310 }
 311
 312 /**
 313  * Add a Bezier using Absolute coords
 314  */
 315 unsigned Document::AddBezier(const Bezier & bezier)
 316 {
 317         Rect bounds = bezier.SolveBounds();
 318         Bezier data = bezier.ToRelative(bounds); // Relative
 319         if (data.ToAbsolute(bounds) != bezier)
 320         {
 321                 Warn("%s != %s", data.ToAbsolute(bounds).Str().c_str(),
 322                         bezier.Str().c_str());
 323                 Warn("ToAbsolute on ToRelative does not give original Bezier");
 324         }
 325         unsigned index = AddBezierData(data);
 326         return Add(BEZIER, bounds, index);
 327 }
 328
 329 unsigned Document::Add(ObjectType type, const Rect & bounds, unsigned data_index, QuadTreeIndex qti)
 330 {
 331         m_objects.types.push_back(type);
 332         m_objects.bounds.push_back(bounds);
 333         m_objects.data_indices.push_back(data_index);
 334 #ifndef QUADTREE_DISABLED
 335         if (qti != -1)
 336         {
 337                 if (m_count == m_quadtree.nodes[qti].object_end+1)
 338                 {
 339                         m_quadtree.nodes[qti].object_end++;
 340                 }
 341                 else
 342                 {
 343                         QuadTreeIndex overlay = m_quadtree.nodes.size();
 344                         m_quadtree.nodes.push_back(m_quadtree.nodes[qti]);
 345                         m_quadtree.nodes[overlay].object_begin = m_count;
 346                         m_quadtree.nodes[overlay].object_end = m_count+1;
 347                         m_quadtree.nodes[qti].next_overlay = overlay;
 348                 }
 349         }
 350 #endif
 351         return (m_count++); // Why can't we just use the size of types or something?
 352 }
 353
 354 unsigned Document::AddBezierData(const Bezier & bezier)
 355 {
 356         m_objects.beziers.push_back(bezier);
 357         return m_objects.beziers.size()-1;
 358 }
 359
 360 unsigned Document::AddPathData(const Path & path)
 361 {
 362         m_objects.paths.push_back(path);
 363         return m_objects.paths.size()-1;
 364 }
 365
 366 void Document::DebugDumpObjects()
 367 {
 368         Debug("Objects for Document %p are:", this);
 369         for (unsigned id = 0; id < ObjectCount(); ++id)
 370         {
 371                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 372         }
 373 }
 374
 375 bool Document::operator==(const Document & equ) const
 376 {
 377         return (ObjectCount() == equ.ObjectCount()
 378                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 379                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 380                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 381 }
 382
 383
 384
 385 // Behold my amazing tokenizing abilities
 386 static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
 387 {
 388         token.clear();
 389         while (i < d.size() && iswspace(d[i]))
 390         {
 391                 ++i;
 392         }
 393
 394         while (i < d.size())
 395         {
 396                 if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
 397                 {
 398                         if (token.size() == 0 && !iswspace(d[i]))
 399                         {
 400                                 token += d[i++];
 401                         }
 402                         break;
 403                 }
 404                 token += d[i++];
 405         }
 406         //Debug("Got token \"%s\"", token.c_str());
 407         return token;
 408 }
 409
 410 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
 411 {
 412         string token("");
 413         while (GetToken(d, token, i, delims) == ",");
 414         x = RealFromStr(token);
 415         if (GetToken(d, token, i, delims) != ",")
 416         {
 417                 Fatal("Expected \",\" seperating x,y pair");
 418         }
 419         y = RealFromStr(GetToken(d,token,i,delims));
 420 }
 421
 422 static bool GetKeyValuePair(const string & d, string & key, string & value, unsigned & i, const string & delims = "()[],{}<>;:=")
 423 {
 424         key = "";
 425         string token;
 426         while (GetToken(d, token, i, delims) == ":" || token == ";");
 427         key = token;
 428         if (GetToken(d, token, i, delims) != ":")
 429         {
 430                 Error("Expected \":\" seperating key:value pair");
 431                 return false;
 432         }
 433         value = "";
 434         GetToken(d, value, i, delims);
 435         return true;
 436 }
 437
 438 static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
 439 {
 440         Real x0(x);
 441         x = transform.a * x + transform.c * y + transform.e;
 442         y = transform.b * x0 + transform.d * y + transform.f;
 443 }
 444
 445 void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
 446 {
 447         //Debug("Parsing transform %s", s.c_str());
 448         string token;
 449         string command;
 450         unsigned i = 0;
 451
 452         while (i < s.size())
 453         {
 454                 GetToken(s, command, i);
 455                 if (command == "," || command == "" || command == ":")
 456                 {
 457                         if (i < s.size())
 458                                 GetToken(s, command, i);
 459                         else
 460                                 return;
 461                 }
 462                 //Debug("Token is \"%s\"", command.c_str());
 463
 464                 SVGMatrix delta = {1,0,0,0,1,0};
 465
 466
 467                 assert(GetToken(s,token, i) == "(");
 468                 if (command == "translate")
 469                 {
 470                         GetXYPair(s, delta.e, delta.f, i);
 471                         assert(GetToken(s,token, i) == ")");
 472                 }
 473                 else if (command == "matrix")
 474                 {
 475                         GetXYPair(s, delta.a, delta.b,i);
 476                         GetXYPair(s, delta.c, delta.d,i);
 477                         GetXYPair(s, delta.e, delta.f,i);
 478                         assert(GetToken(s,token, i) == ")");
 479                 }
 480                 else if (command == "scale")
 481                 {
 482                         delta.a = RealFromStr(GetToken(s,token,i));
 483                         GetToken(s, token, i);
 484                         if (token == ",")
 485                         {
 486                                 delta.d = RealFromStr(GetToken(s,token,i));
 487                                 assert(GetToken(s, token, i) == ")");
 488                         }
 489                         else
 490                         {
 491                                 delta.d = delta.a;
 492                                 assert(token == ")");
 493                         }
 494
 495                 }
 496                 else
 497                 {
 498                         Warn("Unrecognised transform \"%s\", using identity", command.c_str());
 499                 }
 500
 501                 //Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 502                 //Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
 503
 504                 SVGMatrix old(transform);
 505                 transform.a = old.a * delta.a + old.c * delta.b;
 506                 transform.c = old.a * delta.c + old.c * delta.d;
 507                 transform.e = old.a * delta.e + old.c * delta.f + old.e;
 508
 509                 transform.b = old.b * delta.a + old.d * delta.b;
 510                 transform.d = old.b * delta.c + old.d * delta.d;
 511                 transform.f = old.b * delta.e + old.d * delta.f + old.f;
 512
 513                 //Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
 514         }
 515 }
 516
 517 inline Colour ParseColourString(const string & colour_str)
 518 {
 519         Colour c(0,0,0,0);
 520         if (colour_str == "red")
 521                 c = {255,0,0,255};
 522         else if (colour_str == "blue")
 523                 c = {0,0,255,255};
 524         else if (colour_str == "green")
 525                 c = {0,255,0,255};
 526         else if (colour_str == "black")
 527                 c = {0,0,0,255};
 528         else if (colour_str == "white")
 529                 c = {255,255,255,255};
 530         else if (colour_str.size() == 7 && colour_str[0] == '#')
 531         {
 532                 //Debug("Parse colour string: \"%s\"", colour_str.c_str());
 533                 char comp[3] = {colour_str[1], colour_str[2], '\0'};
 534                 c.r = strtoul(comp, NULL, 16);
 535                 comp[0] = colour_str[3]; comp[1] = colour_str[4];
 536                 c.g = strtoul(comp, NULL, 16);
 537                 comp[0] = colour_str[5]; comp[1] = colour_str[6];
 538                 c.b = strtoul(comp, NULL, 16);
 539                 c.a = 255;
 540                 //Debug("Colour is: %u, %u, %u, %u", c.r, c.g, c.b, c.a);
 541         }
 542         return c;
 543 }
 544
 545 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
 546 {
 547         //Debug("Parse node <%s>", root.name());
 548
 549
 550         // Centre the SVGs
 551         if (strcmp(root.name(),"svg") == 0)
 552         {
 553                 Real ww = RealFromStr(root.attribute("width").as_string());
 554                 Real hh = RealFromStr(root.attribute("height").as_string());
 555                 parent_transform.e -= parent_transform.a * ww/Real(2);
 556                 parent_transform.f -= parent_transform.d * hh/Real(2);
 557         }
 558
 559         for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
 560         {
 561                 SVGMatrix transform(parent_transform);
 562                 pugi::xml_attribute attrib_trans = child.attribute("transform");
 563                 if (!attrib_trans.empty())
 564                 {
 565                         ParseSVGTransform(attrib_trans.as_string(), transform);
 566                 }
 567
 568
 569
 570                 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
 571                         || strcmp(child.name(), "group") == 0)
 572                 {
 573
 574                         ParseSVGNode(child, transform);
 575                         continue;
 576                 }
 577                 else if (strcmp(child.name(), "path") == 0)
 578                 {
 579                         string d = child.attribute("d").as_string();
 580                         //Debug("Path data attribute is \"%s\"", d.c_str());
 581                         bool closed = false;
 582                         pair<unsigned, unsigned> range = ParseSVGPathData(d, transform, closed);
 583                         if (true && range.first < m_count && range.second < m_count)//(closed)
 584                         {
 585
 586                                 string colour_str("");
 587                                 map<string, string> style;
 588                                 if (child.attribute("style"))
 589                                 {
 590                                         ParseSVGStyleData(child.attribute("style").as_string(), style);
 591                                 }
 592
 593                                 // Determine shading colour
 594                                 if (child.attribute("fill"))
 595                                 {
 596                                         colour_str = child.attribute("fill").as_string();
 597                                 }
 598                                 else if (style.find("fill") != style.end())
 599                                 {
 600                                         colour_str = style["fill"];
 601                                 }
 602                                 Colour fill = ParseColourString(colour_str);
 603                                 Colour stroke = fill;
 604
 605                                 if (child.attribute("stroke"))
 606                                 {
 607                                         colour_str = child.attribute("stroke").as_string();
 608                                         stroke = ParseColourString(colour_str);
 609                                 }
 610                                 else if (style.find("stroke") != style.end())
 611                                 {
 612                                         colour_str = style["stroke"];
 613                                         stroke = ParseColourString(colour_str);
 614                                 }
 615
 616
 617                                 // Determin shading alpha
 618                                 if (child.attribute("fill-opacity"))
 619                                 {
 620                                         fill.a = 255*child.attribute("fill-opacity").as_float();
 621                                 }
 622                                 else if (style.find("fill-opacity") != style.end())
 623                                 {
 624                                         fill.a = 255*strtod(style["fill-opacity"].c_str(), NULL);
 625                                 }
 626                                 if (child.attribute("stroke-opacity"))
 627                                 {
 628                                         stroke.a = 255*child.attribute("stroke-opacity").as_float();
 629                                 }
 630                                 else if (style.find("stroke-opacity") != style.end())
 631                                 {
 632                                         stroke.a = 255*strtod(style["stroke-opacity"].c_str(), NULL);
 633                                 }
 634                                 AddPath(range.first, range.second, fill, stroke);
 635                         }
 636
 637                 }
 638                 else if (strcmp(child.name(), "line") == 0)
 639                 {
 640                         Real x0(child.attribute("x1").as_float());
 641                         Real y0(child.attribute("y1").as_float());
 642                         Real x1(child.attribute("x2").as_float());
 643                         Real y1(child.attribute("y2").as_float());
 644                         TransformXYPair(x0,y0,transform);
 645                         TransformXYPair(x1,y1,transform);
 646                         AddBezier(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
 647                 }
 648                 else if (strcmp(child.name(), "rect") == 0)
 649                 {
 650                         Real coords[4];
 651                         const char * attrib_names[] = {"x", "y", "width", "height"};
 652                         for (size_t i = 0; i < 4; ++i)
 653                                 coords[i] = child.attribute(attrib_names[i]).as_float();
 654
 655                         Real x2(coords[0]+coords[2]);
 656                         Real y2(coords[1]+coords[3]);
 657                         TransformXYPair(coords[0],coords[1],transform); // x, y, transform
 658                         TransformXYPair(x2,y2,transform);
 659                         coords[2] = x2 - coords[0];
 660                         coords[3] = y2 - coords[1];
 661
 662                         bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
 663                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
 664                 }
 665                 else if (strcmp(child.name(), "circle") == 0)
 666                 {
 667                         Real cx = child.attribute("cx").as_float();
 668                         Real cy = child.attribute("cy").as_float();
 669                         Real r = child.attribute("r").as_float();
 670
 671                         Real x = (cx - r);
 672                         Real y = (cy - r);
 673                         TransformXYPair(x,y,transform);
 674                         Real w = Real(2)*r*transform.a; // width scales
 675                         Real h = Real(2)*r*transform.d; // height scales
 676
 677
 678                         Rect rect(x,y,w,h);
 679                         Add(CIRCLE_FILLED, rect,0);
 680                         Debug("Added Circle %s", rect.Str().c_str());
 681                 }
 682                 else if (strcmp(child.name(), "text") == 0)
 683                 {
 684                         Real x = child.attribute("x").as_float();
 685                         Real y = child.attribute("y").as_float();
 686                         TransformXYPair(x,y,transform);
 687                         Debug("Add text \"%s\"", child.child_value());
 688                         AddText(child.child_value(), 0.05, x, y);
 689                 }
 690         }
 691 }
 692
 693 void Document::ParseSVGStyleData(const string & style, map<string, string> & results)
 694 {
 695         unsigned i = 0;
 696         string key;
 697         string value;
 698         while (i < style.size() && GetKeyValuePair(style, key, value, i))
 699         {
 700                 results[key] = value;
 701         }
 702 }
 703
 704 /**
 705  * Parse an SVG string into a rectangle
 706  */
 707 void Document::ParseSVG(const string & input, const Rect & bounds)
 708 {
 709         using namespace pugi;
 710
 711         xml_document doc_xml;
 712         xml_parse_result result = doc_xml.load(input.c_str());
 713
 714         if (!result)
 715                 Error("Couldn't parse SVG input - %s", result.description());
 716
 717         Debug("Loaded XML - %s", result.description());
 718         SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
 719         ParseSVGNode(doc_xml, transform);
 720 }
 721
 722 /**
 723  * Load an SVG into a rectangle
 724  */
 725 void Document::LoadSVG(const string & filename, const Rect & bounds)
 726 {
 727         using namespace pugi;
 728
 729         xml_document doc_xml;
 730         ifstream input(filename.c_str(), ios_base::in);
 731         xml_parse_result result = doc_xml.load(input);
 732
 733         if (!result)
 734                 Error("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 735
 736         Debug("Loaded XML from \"%s\" - %s", filename.c_str(), result.description());
 737
 738         input.close();
 739                                                 // a c e, b d f
 740         SVGMatrix transform = {bounds.w,0 ,bounds.x, 0,bounds.h,bounds.y};
 741         ParseSVGNode(doc_xml, transform);
 742 }
 743
 744
 745
 746 // Fear the wrath of the tokenizing svg data
 747 // Seriously this isn't really very DOM-like at all is it?
 748 pair<unsigned, unsigned> Document::ParseSVGPathData(const string & d, const SVGMatrix & transform, bool & closed)
 749 {
 750         closed = false;
 751         Real x[4] = {0,0,0,0};
 752         Real y[4] = {0,0,0,0};
 753
 754         string token("");
 755         string command("m");
 756
 757         Real x0(0);
 758         Real y0(0);
 759
 760         unsigned i = 0;
 761         unsigned prev_i = 0;
 762
 763         bool start = false;
 764
 765
 766         static string delims("()[],{}<>;:=LlHhVvmMqQzZcC");
 767
 768         pair<unsigned, unsigned> range(m_count, m_count);
 769
 770         while (i < d.size() && GetToken(d, token, i, delims).size() > 0)
 771         {
 772                 if (isalpha(token[0]))
 773                         command = token;
 774                 else
 775                 {
 776                         i = prev_i; // hax
 777                         if(command == "")
 778                                 command = "L";
 779                 }
 780
 781                 bool relative = islower(command[0]);
 782
 783                 if (command == "m" || command == "M")
 784                 {
 785                         //Debug("Construct moveto command");
 786                         Real dx = RealFromStr(GetToken(d,token,i,delims));
 787                         assert(GetToken(d,token,i,delims) == ",");
 788                         Real dy = RealFromStr(GetToken(d,token,i,delims));
 789
 790                         x[0] = (relative) ? x[0] + dx : dx;
 791                         y[0] = (relative) ? y[0] + dy : dy;
 792
 793                         x0 = x[0];
 794                         y0 = y[0];
 795                         //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 796                         command = (command == "m") ? "l" : "L";
 797                 }
 798                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 799                 {
 800                         //Debug("Construct curveto command");
 801                         Real dx = RealFromStr(GetToken(d,token,i,delims));
 802                         assert(GetToken(d,token,i,delims) == ",");
 803                         Real dy = RealFromStr(GetToken(d,token,i,delims));
 804
 805                         x[1] = (relative) ? x[0] + dx : dx;
 806                         y[1] = (relative) ? y[0] + dy : dy;
 807
 808                         dx = RealFromStr(GetToken(d,token,i,delims));
 809                         assert(GetToken(d,token,i,delims) == ",");
 810                         dy = RealFromStr(GetToken(d,token,i,delims));
 811
 812                         x[2] = (relative) ? x[0] + dx : dx;
 813                         y[2] = (relative) ? y[0] + dy : dy;
 814
 815                         if (command != "q" && command != "Q")
 816                         {
 817                                 dx = RealFromStr(GetToken(d,token,i,delims));
 818                                 assert(GetToken(d,token,i,delims) == ",");
 819                                 dy = RealFromStr(GetToken(d,token,i,delims));
 820                                 x[3] = (relative) ? x[0] + dx : dx;
 821                                 y[3] = (relative) ? y[0] + dy : dy;
 822                         }
 823                         else
 824                         {
 825                                 x[3] = x[2];
 826                                 y[3] = y[2];
 827                                 Real old_x1(x[1]), old_y1(y[1]);
 828                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 829                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 830                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 831                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 832                         }
 833
 834                         Real x3(x[3]);
 835                         Real y3(y[3]);
 836                         for (int j = 0; j < 4; ++j)
 837                                 TransformXYPair(x[j],y[j], transform);
 838
 839                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 840
 841                         //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]));
 842
 843                         x[0] = x3;
 844                         y[0] = y3;
 845
 846
 847                 }
 848                 else if (command == "l" || command == "L" || command == "h" || command == "H" || command == "v" || command == "V")
 849                 {
 850                         //Debug("Construct lineto command, relative %d", relative);
 851
 852                         Real dx = RealFromStr(GetToken(d,token,i,delims));
 853                         Real dy = 0;
 854                         if (command == "l" || command == "L")
 855                         {
 856                                 assert(GetToken(d,token,i,delims) == ",");
 857                                 dy = RealFromStr(GetToken(d,token,i,delims));
 858                         }
 859                         else if (command == "v" || command == "V")
 860                         {
 861                                 swap(dx,dy);
 862                         }
 863
 864                         x[1] = (relative) ? x[0] + dx : dx;
 865                         y[1] = (relative) ? y[0] + dy : dy;
 866                         if (command == "v" || command == "V")
 867                         {
 868                                 x[1] = x[0];
 869                         }
 870                         else if (command == "h" || command == "H")
 871                         {
 872                                 y[1] = y[0];
 873                         }
 874
 875                         Real x1(x[1]);
 876                         Real y1(y[1]);
 877
 878                         TransformXYPair(x[0],y[0],transform);
 879                         TransformXYPair(x[1],y[1],transform);
 880
 881
 882                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
 883
 884                         //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 885
 886                         x[0] = x1;
 887                         y[0] = y1;
 888
 889                 }
 890                 else if (command == "z" || command == "Z")
 891                 {
 892                         //Debug("Construct returnto command");
 893                         x[1] = x0;
 894                         y[1] = y0;
 895                         x[2] = x0;
 896                         y[2] = y0;
 897                         x[3] = x0;
 898                         y[3] = y0;
 899
 900                         Real x3(x[3]);
 901                         Real y3(y[3]);
 902                         for (int j = 0; j < 4; ++j)
 903                                 TransformXYPair(x[j],y[j], transform);
 904
 905                         range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 906                         //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 907
 908                         x[0] = x3;
 909                         y[0] = y3;
 910                         command = "m";
 911                         closed = true;
 912                 }
 913                 else
 914                 {
 915                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 916                         command = "m";
 917                 }
 918
 919                 if (!start)
 920                 {
 921                         x0 = x[0];
 922                         y0 = y[0];
 923                         start = true;
 924                 }
 925                 prev_i = i;
 926         }
 927         return range;
 928 }
 929
 930 void Document::SetFont(const string & font_filename)
 931 {
 932         if (m_font_data != NULL)
 933         {
 934                 free(m_font_data);
 935         }
 936
 937         FILE *font_file = fopen(font_filename.c_str(), "rb");
 938         fseek(font_file, 0, SEEK_END);
 939         size_t font_file_size = ftell(font_file);
 940         fseek(font_file, 0, SEEK_SET);
 941         m_font_data = (unsigned char*)malloc(font_file_size);
 942         size_t read = fread(m_font_data, 1, font_file_size, font_file);
 943         if (read != font_file_size)
 944         {
 945                 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
 946         }
 947         fclose(font_file);
 948         stbtt_InitFont(&m_font, m_font_data, 0);
 949 }
 950
 951 void Document::AddText(const string & text, Real scale, Real x, Real y)
 952 {
 953         if (m_font_data == NULL)
 954         {
 955                 Warn("No font loaded");
 956                 return;
 957         }
 958
 959         Real x0(x);
 960         //Real y0(y);
 961         int ascent = 0, descent = 0, line_gap = 0;
 962         stbtt_GetFontVMetrics(&m_font, &ascent, &descent, &line_gap);
 963         Real font_scale = scale;
 964         font_scale /= Real(ascent - descent);
 965         Real y_advance = Real(font_scale) * Real(ascent - descent + line_gap);
 966         for (unsigned i = 0; i < text.size(); ++i)
 967         {
 968                 if (text[i] == '\n')
 969                 {
 970                         y += y_advance;
 971                         x = x0;
 972                 }
 973                 if (!isprint(text[i]))
 974                         continue;
 975
 976                 int advance_width = 0, left_side_bearing = 0, kerning = 0;
 977                 stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
 978                 if (i >= 1)
 979                 {
 980                         kerning = stbtt_GetCodepointKernAdvance(&m_font, text[i-1], text[i]);
 981                 }
 982                 x += font_scale * Real(kerning);
 983                 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
 984                 x += font_scale * Real(advance_width);
 985         }
 986 }
 987
 988 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 989 {
 990         int glyph_index = stbtt_FindGlyphIndex(font, character);
 991
 992         // Check if there is actully a glyph to render.
 993         if (stbtt_IsGlyphEmpty(font, glyph_index))
 994         {
 995                 return;
 996         }
 997
 998         stbtt_vertex *instructions;
 999         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
1000
1001         Real current_x(0), current_y(0);
1002         unsigned start_index = m_count;
1003         unsigned end_index = m_count;
1004         for (int i = 0; i < num_instructions; ++i)
1005         {
1006                 // TTF uses 16-bit signed ints for coordinates:
1007                 // with the y-axis inverted compared to us.
1008                 // Convert and scale any data.
1009                 Real inst_x = Real(instructions[i].x)*scale;
1010                 Real inst_y = Real(instructions[i].y)*-scale;
1011                 Real inst_cx = Real(instructions[i].cx)*scale;
1012                 Real inst_cy = Real(instructions[i].cy)*-scale;
1013                 Real old_x(current_x), old_y(current_y);
1014                 current_x = inst_x;
1015                 current_y = inst_y;
1016
1017                 switch(instructions[i].type)
1018                 {
1019                 // Move To
1020                 case STBTT_vmove:
1021                         break;
1022                 // Line To
1023                 case STBTT_vline:
1024                         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));
1025                         break;
1026                 // Quadratic Bezier To:
1027                 case STBTT_vcurve:
1028                         // Quadratic -> Cubic:
1029                         // - Endpoints are the same.
1030                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
1031                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
1032                         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,
1033                                                 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));
1034                         break;
1035                 }
1036         }
1037
1038         if (start_index < m_count && end_index < m_count)
1039         {
1040                 AddPath(start_index, end_index);
1041         }
1042         //Debug("Added Glyph \"%c\" at %f %f, scale %f", (char)character, Float(x), Float(y), Float(scale));
1043
1044         stbtt_FreeShape(font, instructions);
1045 }
1046
1047 void Document::TransformObjectBounds(const SVGMatrix & transform)
1048 {
1049         for (unsigned i = 0; i < m_count; ++i)
1050         {
1051                 TransformXYPair(m_objects.bounds[i].x, m_objects.bounds[i].y, transform);
1052                 m_objects.bounds[i].w *= transform.a;
1053                 m_objects.bounds[i].h *= transform.d;
1054         }
1055 }
1056
1057 void Document::TranslateObjects(const Real & dx, const Real & dy, ObjectType type)
1058 {
1059         #ifdef TRANSFORM_BEZIERS_TO_PATH
1060                 for (unsigned i = 0; i < m_objects.paths.size(); ++i)
1061                 {
1062                         Path & p = m_objects.paths[i];
1063                         p.m_bounds.x += dx;
1064                         p.m_bounds.y += dy;
1065                 }
1066                 return;
1067         #endif
1068
1069         for (unsigned i = 0; i < m_count; ++i)
1070         {
1071                 if (type == NUMBER_OF_OBJECT_TYPES || m_objects.types[i] == type)
1072                 {
1073                         m_objects.bounds[i].x += dx;
1074                         m_objects.bounds[i].y += dy;
1075                 }
1076         }
1077 }
1078
1079 void Document::ScaleObjectsAboutPoint(const Real & x, const Real & y, const Real & scale_amount, ObjectType type)
1080 {
1081         #ifdef TRANSFORM_BEZIERS_TO_PATH
1082                 for (unsigned i = 0; i < m_objects.paths.size(); ++i)
1083                 {
1084                         Path & p = m_objects.paths[i];
1085                         p.m_bounds.w /= scale_amount;
1086                         p.m_bounds.h /= scale_amount;
1087                         p.m_bounds.x -= x;
1088                         p.m_bounds.x /= scale_amount;
1089                         p.m_bounds.x += x;
1090                         p.m_bounds.y -= y;
1091                         p.m_bounds.y /= scale_amount;
1092                         p.m_bounds.y += y;
1093                 }
1094                 return;
1095         #endif
1096
1097         for (unsigned i = 0; i < m_count; ++i)
1098         {
1099                 if (type != NUMBER_OF_OBJECT_TYPES && m_objects.types[i] != type)
1100                         continue;
1101
1102                 m_objects.bounds[i].w /= scale_amount;
1103                 m_objects.bounds[i].h /= scale_amount;
1104                 //m_objects.bounds[i].x = x + (m_objects.bounds[i].x-x)/scale_amount;
1105                 //m_objects.bounds[i].y = y + (m_objects.bounds[i].y-x)/scale_amount;
1106                 m_objects.bounds[i].x -= x;
1107                 m_objects.bounds[i].x /= scale_amount;
1108                 m_objects.bounds[i].x += x;
1109
1110                 m_objects.bounds[i].y -= y;
1111                 m_objects.bounds[i].y /= scale_amount;
1112                 m_objects.bounds[i].y += y;
1113         }
1114
1115 }
1116
1117