src/document.cpp

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