src/document.cpp

   1 #include "document.h"
   2 #include "bezier.h"
   3 #include <cstdio>
   4 #include <fstream>
   5
   6 using namespace IPDF;
   7 using namespace std;
   8
   9 //TODO: Make this work for variable sized Reals
  10
  11 // Loads an std::vector<T> of size num_elements from a file.
  12 template<typename T>
  13 static void LoadStructVector(FILE *src_file, size_t num_elems, std::vector<T>& dest)
  14 {
  15         size_t structsread = 0;
  16         dest.resize(num_elems);
  17         structsread = fread(dest.data(), sizeof(T), num_elems, src_file);
  18         if (structsread != num_elems)
  19                 Fatal("Only read %u structs (expected %u)!", structsread, num_elems);
  20 }
  21
  22 // Saves an std::vector<T> to a file. Size must be saves separately.
  23 template<typename T>
  24 static void SaveStructVector(FILE *dst_file, std::vector<T>& src)
  25 {
  26         size_t written = 0;
  27         written = fwrite(src.data(), sizeof(T), src.size(), dst_file);
  28         if (written != src.size())
  29                 Fatal("Only wrote %u structs (expected %u)!", written, src.size());
  30 }
  31
  32 static void WriteChunkHeader(FILE *dst_file, DocChunkTypes type, uint32_t size)
  33 {
  34         size_t written = 0;
  35         written = fwrite(&type, sizeof(type), 1, dst_file);
  36         if (written != 1)
  37                 Fatal("Could not write Chunk header! (ID)");
  38         written = fwrite(&size, sizeof(size), 1, dst_file);
  39         if (written != 1)
  40                 Fatal("Could not write Chunk header (size)!");
  41 }
  42
  43 static bool ReadChunkHeader(FILE *src_file, DocChunkTypes& type, uint32_t& size)
  44 {
  45         if (fread(&type, sizeof(DocChunkTypes), 1, src_file) != 1)
  46                 return false;
  47         if (fread(&size, sizeof(uint32_t), 1, src_file) != 1)
  48                 return false;
  49         return true;
  50 }
  51
  52 void Document::Save(const string & filename)
  53 {
  54         Debug("Saving document to file \"%s\"...", filename.c_str());
  55         FILE * file = fopen(filename.c_str(), "w");
  56         if (file == NULL)
  57                 Fatal("Couldn't open file \"%s\" - %s", filename.c_str(), strerror(errno));
  58
  59         size_t written;
  60         Debug("Number of objects (%u)...", ObjectCount());
  61         WriteChunkHeader(file, CT_NUMOBJS, sizeof(m_count));
  62         written = fwrite(&m_count, sizeof(m_count), 1, file);
  63         if (written != 1)
  64                 Fatal("Failed to write number of objects!");
  65
  66         Debug("Object types...");
  67         WriteChunkHeader(file, CT_OBJTYPES, m_objects.types.size() * sizeof(ObjectType));
  68         SaveStructVector<ObjectType>(file, m_objects.types);
  69
  70         Debug("Object bounds...");
  71         WriteChunkHeader(file, CT_OBJBOUNDS, m_objects.bounds.size() * sizeof(Rect));
  72         SaveStructVector<Rect>(file, m_objects.bounds);
  73
  74         Debug("Object data indices...");
  75         WriteChunkHeader(file, CT_OBJINDICES, m_objects.data_indices.size() * sizeof(unsigned));
  76         SaveStructVector<unsigned>(file, m_objects.data_indices);
  77
  78         Debug("Bezier data...");
  79         WriteChunkHeader(file, CT_OBJBEZIERS, m_objects.beziers.size() * sizeof(uint8_t));
  80         SaveStructVector<Bezier>(file, m_objects.beziers);
  81
  82         int err = fclose(file);
  83         if (err != 0)
  84                 Fatal("Failed to close file \"%s\" - %s", filename.c_str(), strerror(err));
  85
  86         Debug("Successfully saved %u objects to \"%s\"", ObjectCount(), filename.c_str());
  87 }
  88
  89 #ifndef QUADTREE_DISABLED
  90
  91 void Document::GenBaseQuadtree()
  92 {
  93         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QTC_UNKNOWN, 0, ObjectCount()});
  94         m_quadtree.root_id = 0;
  95         GenQuadChild(0, QTC_TOP_LEFT);
  96         GenQuadParent(0, QTC_BOTTOM_RIGHT);
  97 }
  98
  99 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 100 {
 101         QuadTreeIndex new_index = m_quadtree.nodes.size();
 102         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 103
 104         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 105         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 106         {
 107                 if (ContainedInQuadChild(m_objects.bounds[i], type))
 108                 {
 109                         m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[i], type));
 110                         m_objects.types.push_back(m_objects.types[i]);
 111                         m_objects.data_indices.push_back(m_objects.data_indices[i]);
 112                         m_count++;
 113                 }
 114         }
 115         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 116         switch (type)
 117         {
 118                 case QTC_TOP_LEFT:
 119                         m_quadtree.nodes[parent].top_left = new_index;
 120                         break;
 121                 case QTC_TOP_RIGHT:
 122                         m_quadtree.nodes[parent].top_right = new_index;
 123                         break;
 124                 case QTC_BOTTOM_LEFT:
 125                         m_quadtree.nodes[parent].bottom_left = new_index;
 126                         break;
 127                 case QTC_BOTTOM_RIGHT:
 128                         m_quadtree.nodes[parent].bottom_right = new_index;
 129                         break;
 130                 default:
 131                         Fatal("Tried to add a QuadTree child of invalid type!");
 132         }
 133         return new_index;
 134 }
 135
 136 // Reparent a quadtree node, making it the "type" child of a new node.
 137 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 138 {
 139         QuadTreeIndex new_index = m_quadtree.nodes.size();
 140         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
 141
 142         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 143         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 144         {
 145                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 146                 m_objects.types.push_back(m_objects.types[i]);
 147                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 148                 m_count++;
 149         }
 150         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 151         switch (type)
 152         {
 153                 case QTC_TOP_LEFT:
 154                         m_quadtree.nodes[new_index].top_left = child;
 155                         break;
 156                 case QTC_TOP_RIGHT:
 157                         m_quadtree.nodes[new_index].top_right = child;
 158                         break;
 159                 case QTC_BOTTOM_LEFT:
 160                         m_quadtree.nodes[new_index].bottom_left = child;
 161                         break;
 162                 case QTC_BOTTOM_RIGHT:
 163                         m_quadtree.nodes[new_index].bottom_right = child;
 164                         break;
 165                 default:
 166                         Fatal("Tried to add a QuadTree child of invalid type!");
 167         }
 168         return new_index;
 169 }
 170
 171 #endif
 172
 173 void Document::Load(const string & filename)
 174 {
 175         m_objects.bounds.clear();
 176         m_count = 0;
 177         if (filename == "")
 178         {
 179                 Debug("Loaded empty document.");
 180                 return;
 181         }
 182         Debug("Loading document from file \"%s\"", filename.c_str());
 183         FILE * file = fopen(filename.c_str(), "r");
 184         if (file == NULL)
 185                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 186
 187         size_t read;
 188
 189         DocChunkTypes chunk_type;
 190         uint32_t chunk_size;
 191         while (ReadChunkHeader(file, chunk_type, chunk_size))
 192         {
 193                 switch(chunk_type)
 194                 {
 195                 case CT_NUMOBJS:
 196                         read = fread(&m_count, sizeof(m_count), 1, file);
 197                         if (read != 1)
 198                                 Fatal("Failed to read number of objects!");
 199                         Debug("Number of objects: %u", ObjectCount());
 200                         break;
 201                 case CT_OBJTYPES:
 202                         Debug("Object types...");
 203                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 204                         break;
 205                 case CT_OBJBOUNDS:
 206                         Debug("Object bounds...");
 207                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 208                         break;
 209                 case CT_OBJINDICES:
 210                         Debug("Object data indices...");
 211                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 212                         break;
 213                 case CT_OBJBEZIERS:
 214                         Debug("Bezier data...");
 215                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 216                         break;
 217                 }
 218         }
 219         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 220 #ifndef QUADTREE_DISABLED
 221         if (m_quadtree.root_id == QUADTREE_EMPTY)
 222         {
 223                 GenBaseQuadtree();
 224         }
 225 #endif
 226 }
 227
 228 void Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 229 {
 230         m_objects.types.push_back(type);
 231         m_objects.bounds.push_back(bounds);
 232         m_objects.data_indices.push_back(data_index);
 233         ++m_count; // Why can't we just use the size of types or something?
 234 }
 235
 236 unsigned Document::AddBezierData(const Bezier & bezier)
 237 {
 238         m_objects.beziers.push_back(bezier);
 239         return m_objects.beziers.size()-1;
 240 }
 241
 242
 243 void Document::DebugDumpObjects()
 244 {
 245         Debug("Objects for Document %p are:", this);
 246         for (unsigned id = 0; id < ObjectCount(); ++id)
 247         {
 248                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 249         }
 250 }
 251
 252 bool Document::operator==(const Document & equ) const
 253 {
 254         return (ObjectCount() == equ.ObjectCount()
 255                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 256                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 257                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 258 }
 259
 260
 261 #include "../contrib/pugixml-1.4/src/pugixml.hpp"
 262 #include "../contrib/pugixml-1.4/src/pugixml.cpp"
 263
 264 /**
 265  * Load an SVG into a rectangle
 266  */
 267 void Document::LoadSVG(const string & filename, const Rect & bounds)
 268 {
 269         using namespace pugi;
 270
 271         xml_document doc_xml;
 272         ifstream input(filename.c_str(), ios_base::in);
 273         xml_parse_result result = doc_xml.load(input);
 274
 275         if (!result)
 276                 Fatal("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 277
 278         Debug("Loaded XML - %s", result.description());
 279
 280         input.close();
 281
 282         // Combine all SVG tags into one thing because lazy
 283         for (xml_node svg = doc_xml.child("svg"); svg; svg = svg.next_sibling("svg"))
 284         {
 285                 Real width = svg.attribute("width").as_float() * bounds.w;
 286                 Real height = svg.attribute("width").as_float() * bounds.h;
 287
 288
 289                 // Rectangles
 290                 Real coords[4];
 291                 const char * attrib_names[] = {"x", "y", "width", "height"};
 292                 for (pugi::xml_node rect = svg.child("rect"); rect; rect = rect.next_sibling("rect"))
 293                 {
 294                         for (size_t i = 0; i < 4; ++i)
 295                                 coords[i] = rect.attribute(attrib_names[i]).as_float();
 296
 297                         bool outline = !(rect.attribute("fill"));
 298                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0]/width + bounds.x, coords[1]/height + bounds.y, coords[2]/width, coords[3]/height),0);
 299                         Debug("Added rectangle");
 300                 }
 301
 302                 // Circles
 303                 for (pugi::xml_node circle = svg.child("circle"); circle; circle = circle.next_sibling("circle"))
 304                 {
 305                         Real cx = circle.attribute("cx").as_float();
 306                         Real cy = circle.attribute("cy").as_float();
 307                         Real r = circle.attribute("r").as_float();
 308
 309                         Real x = (cx - r)/width + bounds.x;
 310                         Real y = (cy - r)/height + bounds.y;
 311                         Real w = 2*r/width;
 312                         Real h = 2*r/height;
 313
 314                         Rect rect(x,y,w,h);
 315                         Add(CIRCLE_FILLED, rect,0);
 316                         Debug("Added Circle %s", rect.Str().c_str());
 317
 318                 }
 319
 320                 // paths
 321                 for (pugi::xml_node path = svg.child("path"); path; path = path.next_sibling("path"))
 322                 {
 323
 324                         string d = path.attribute("d").as_string();
 325                         Debug("Path data attribute is \"%s\"", d.c_str());
 326                         AddPathFromString(d, Rect(bounds.x,bounds.y,width,height));
 327
 328                 }
 329         }
 330
 331         //Fatal("Done");
 332
 333
 334
 335 }
 336
 337 // Behold my amazing tokenizing abilities
 338 static string & GetToken(const string & d, string & token, unsigned & i)
 339 {
 340         token.clear();
 341         while (i < d.size() && iswspace(d[i]))
 342         {
 343                 ++i;
 344         }
 345
 346         while (i < d.size())
 347         {
 348                 if (d[i] == ',' || (isalpha(d[i]) && d[i] != 'e') || iswspace(d[i]))
 349                 {
 350                         if (token.size() == 0 && !iswspace(d[i]))
 351                         {
 352                                 token += d[i++];
 353                         }
 354                         break;
 355                 }
 356                 token += d[i++];
 357         }
 358         Debug("Got token \"%s\"", token.c_str());
 359         return token;
 360 }
 361
 362
 363 // Fear the wrath of the tokenizing svg data
 364 // Seriously this isn't really very DOM-like at all is it?
 365 void Document::AddPathFromString(const string & d, const Rect & bounds)
 366 {
 367         Real x[4] = {0,0,0,0};
 368         Real y[4] = {0,0,0,0};
 369
 370         string token("");
 371         string command("m");
 372
 373         Real x0(0);
 374         Real y0(0);
 375
 376         unsigned i = 0;
 377         unsigned prev_i = 0;
 378
 379         bool start = false;
 380
 381         while (i < d.size() && GetToken(d, token, i).size() > 0)
 382         {
 383                 if (isalpha(token[0]))
 384                         command = token;
 385                 else
 386                 {
 387                         i = prev_i; // hax
 388                         if(command == "")
 389                                 command = "L";
 390                 }
 391
 392                 bool relative = islower(command[0]);
 393
 394                 if (command == "m" || command == "M")
 395                 {
 396                         Debug("Construct moveto command");
 397                         Real dx = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.w;
 398                         assert(GetToken(d,token,i) == ",");
 399                         Real dy = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.h;
 400
 401                         x[0] = (relative) ? x[0] + dx : dx;
 402                         y[0] = (relative) ? y[0] + dy : dy;
 403
 404
 405
 406                         Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 407                         command = (command == "m") ? "l" : "L";
 408                 }
 409                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 410                 {
 411                         Debug("Construct curveto command");
 412                         Real dx = strtod(GetToken(d,token,i).c_str(),NULL)/bounds.w;
 413                         assert(GetToken(d,token,i) == ",");
 414                         Real dy = strtod(GetToken(d,token,i).c_str(),NULL)/bounds.h;
 415
 416                         x[1] = (relative) ? x[0] + dx : dx;
 417                         y[1] = (relative) ? y[0] + dy : dy;
 418
 419                         dx = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.w;
 420                         assert(GetToken(d,token,i) == ",");
 421                         dy = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.h;
 422
 423                         x[2] = (relative) ? x[0] + dx : dx;
 424                         y[2] = (relative) ? y[0] + dy : dy;
 425
 426                         if (command != "q" && command != "Q")
 427                         {
 428                                 dx = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.w;
 429                                 assert(GetToken(d,token,i) == ",");
 430                                 dy = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.h;
 431                                 x[3] = (relative) ? x[0] + dx : dx;
 432                                 y[3] = (relative) ? y[0] + dy : dy;
 433                         }
 434                         else
 435                         {
 436                                 x[3] = x[2];
 437                                 y[3] = y[2];
 438                         }
 439
 440                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 441                         Add(BEZIER,Rect(0,0,1,1),index);
 442
 443
 444                         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]));
 445
 446                         x[0] = x[3];
 447                         y[0] = y[3];
 448
 449
 450                 }
 451                 else if (command == "l" || command == "L")
 452                 {
 453                         Debug("Construct lineto command");
 454
 455                         Real dx = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.w;
 456                         assert(GetToken(d,token,i) == ",");
 457                         Real dy = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.h;
 458
 459                         x[1] = (relative) ? x0 + dx : dx;
 460                         y[1] = (relative) ? y0 + dy : dy;
 461
 462                         x[2] = x[1];
 463                         y[2] = y[1];
 464
 465                         x[3] = x[1];
 466                         y[3] = y[1];
 467
 468                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 469                         Add(BEZIER,Rect(0,0,1,1),index);
 470
 471                         Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 472
 473                         x[0] = x[3];
 474                         y[0] = y[3];
 475
 476                 }
 477                 else if (command == "z" || command == "Z")
 478                 {
 479                         Debug("Construct returnto command");
 480                         x[1] = x0;
 481                         y[1] = y0;
 482                         x[2] = x0;
 483                         y[2] = y0;
 484                         x[3] = x0;
 485                         y[3] = y0;
 486
 487                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 488                         Add(BEZIER,Rect(0,0,1,1),index);
 489
 490                         Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 491
 492                         x[0] = x[3];
 493                         y[0] = y[3];
 494                         command = "m";
 495                 }
 496                 else
 497                 {
 498                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 499                         command = "m";
 500                 }
 501
 502                 if (!start)
 503                 {
 504                         x0 = x[0];
 505                         y0 = y[0];
 506                         start = true;
 507                 }
 508                 prev_i = i;
 509         }
 510 }