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         GenQuadNode(0, QTC_TOP_LEFT);
  96 }
  97
  98 QuadTreeIndex Document::GenQuadNode(QuadTreeIndex parent, QuadTreeNodeChildren type)
  99 {
 100         QuadTreeIndex new_index = m_quadtree.nodes.size();
 101         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 102
 103         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 104         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 105         {
 106                 if (ContainedInQuadChild(m_objects.bounds[i], type))
 107                 {
 108                         m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[i], type));
 109                         m_objects.types.push_back(m_objects.types[i]);
 110                         m_objects.data_indices.push_back(m_objects.data_indices[i]);
 111                         m_count++;
 112                 }
 113         }
 114         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 115         switch (type)
 116         {
 117                 case QTC_TOP_LEFT:
 118                         m_quadtree.nodes[parent].top_left = new_index;
 119                         break;
 120                 case QTC_TOP_RIGHT:
 121                         m_quadtree.nodes[parent].top_right = new_index;
 122                         break;
 123                 case QTC_BOTTOM_LEFT:
 124                         m_quadtree.nodes[parent].bottom_left = new_index;
 125                         break;
 126                 case QTC_BOTTOM_RIGHT:
 127                         m_quadtree.nodes[parent].bottom_right = new_index;
 128                         break;
 129                 default:
 130                         Fatal("Tried to add a QuadTree child of invalid type!");
 131         }
 132         return new_index;
 133 }
 134
 135 #endif
 136
 137 void Document::Load(const string & filename)
 138 {
 139         m_objects.bounds.clear();
 140         m_count = 0;
 141         if (filename == "")
 142         {
 143                 Debug("Loaded empty document.");
 144                 return;
 145         }
 146         Debug("Loading document from file \"%s\"", filename.c_str());
 147         FILE * file = fopen(filename.c_str(), "r");
 148         if (file == NULL)
 149                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 150
 151         size_t read;
 152
 153         DocChunkTypes chunk_type;
 154         uint32_t chunk_size;
 155         while (ReadChunkHeader(file, chunk_type, chunk_size))
 156         {
 157                 switch(chunk_type)
 158                 {
 159                 case CT_NUMOBJS:
 160                         read = fread(&m_count, sizeof(m_count), 1, file);
 161                         if (read != 1)
 162                                 Fatal("Failed to read number of objects!");
 163                         Debug("Number of objects: %u", ObjectCount());
 164                         break;
 165                 case CT_OBJTYPES:
 166                         Debug("Object types...");
 167                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 168                         break;
 169                 case CT_OBJBOUNDS:
 170                         Debug("Object bounds...");
 171                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 172                         break;
 173                 case CT_OBJINDICES:
 174                         Debug("Object data indices...");
 175                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 176                         break;
 177                 case CT_OBJBEZIERS:
 178                         Debug("Bezier data...");
 179                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 180                         break;
 181                 }
 182         }
 183         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 184 #ifndef QUADTREE_DISABLED
 185         if (m_quadtree.root_id == QUADTREE_EMPTY)
 186         {
 187                 GenBaseQuadtree();
 188         }
 189 #endif
 190 }
 191
 192 void Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 193 {
 194         m_objects.types.push_back(type);
 195         m_objects.bounds.push_back(bounds);
 196         m_objects.data_indices.push_back(data_index);
 197         ++m_count; // Why can't we just use the size of types or something?
 198 }
 199
 200 unsigned Document::AddBezierData(const Bezier & bezier)
 201 {
 202         m_objects.beziers.push_back(bezier);
 203         return m_objects.beziers.size()-1;
 204 }
 205
 206
 207 void Document::DebugDumpObjects()
 208 {
 209         Debug("Objects for Document %p are:", this);
 210         for (unsigned id = 0; id < ObjectCount(); ++id)
 211         {
 212                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 213         }
 214 }
 215
 216 bool Document::operator==(const Document & equ) const
 217 {
 218         return (ObjectCount() == equ.ObjectCount()
 219                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 220                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 221                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 222 }
 223
 224
 225 #include "../contrib/pugixml-1.4/src/pugixml.hpp"
 226 #include "../contrib/pugixml-1.4/src/pugixml.cpp"
 227
 228 /**
 229  * Load an SVG into a rectangle
 230  */
 231 void Document::LoadSVG(const string & filename, const Rect & bounds)
 232 {
 233         using namespace pugi;
 234
 235         xml_document doc_xml;
 236         ifstream input(filename.c_str(), ios_base::in);
 237         xml_parse_result result = doc_xml.load(input);
 238
 239         if (!result)
 240                 Fatal("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 241
 242         Debug("Loaded XML - %s", result.description());
 243
 244         input.close();
 245
 246         // Combine all SVG tags into one thing because lazy
 247         for (xml_node svg : doc_xml.children("svg"))
 248         {
 249                 Real width = svg.attribute("width").as_float() * bounds.w;
 250                 Real height = svg.attribute("width").as_float() * bounds.h;
 251
 252
 253                 // Rectangles
 254                 Real coords[4];
 255                 const char * attrib_names[] = {"x", "y", "width", "height"};
 256                 for (pugi::xml_node rect : svg.children("rect"))
 257                 {
 258                         for (size_t i = 0; i < 4; ++i)
 259                                 coords[i] = rect.attribute(attrib_names[i]).as_float();
 260
 261                         bool outline = !(rect.attribute("fill"));
 262                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0]/width + bounds.x, coords[1]/height + bounds.y, coords[2]/width, coords[3]/height),0);
 263                         Debug("Added rectangle");
 264                 }
 265
 266                 // Circles
 267                 for (pugi::xml_node circle : svg.children("circle"))
 268                 {
 269                         Real cx = circle.attribute("cx").as_float();
 270                         Real cy = circle.attribute("cy").as_float();
 271                         Real r = circle.attribute("r").as_float();
 272
 273                         Real x = (cx - r)/width + bounds.x;
 274                         Real y = (cy - r)/height + bounds.y;
 275                         Real w = 2*r/width;
 276                         Real h = 2*r/height;
 277
 278                         Rect rect(x,y,w,h);
 279                         Add(CIRCLE_FILLED, rect,0);
 280                         Debug("Added Circle %s", rect.Str().c_str());
 281
 282                 }
 283
 284                 // paths
 285                 for (pugi::xml_node path : svg.children("path"))
 286                 {
 287
 288                         string d = path.attribute("d").as_string();
 289                         Debug("Path data attribute is \"%s\"", d.c_str());
 290                         AddPathFromString(d, Rect(bounds.x,bounds.y,width,height));
 291
 292                 }
 293         }
 294
 295         //Fatal("Done");
 296
 297
 298
 299 }
 300
 301 // Behold my amazing tokenizing abilities
 302 static string & GetToken(const string & d, string & token, unsigned & i)
 303 {
 304         token.clear();
 305         while (i < d.size() && iswspace(d[i]))
 306         {
 307                 ++i;
 308         }
 309
 310         while (i < d.size())
 311         {
 312                 if (d[i] == ',' || (isalpha(d[i]) && d[i] != 'e') || iswspace(d[i]))
 313                 {
 314                         if (token.size() == 0 && !iswspace(d[i]))
 315                         {
 316                                 token += d[i++];
 317                         }
 318                         break;
 319                 }
 320                 token += d[i++];
 321         }
 322         Debug("Got token \"%s\"", token.c_str());
 323         return token;
 324 }
 325
 326
 327 // Fear the wrath of the tokenizing svg data
 328 // Seriously this isn't really very DOM-like at all is it?
 329 void Document::AddPathFromString(const string & d, const Rect & bounds)
 330 {
 331         Real x[4] = {0,0,0,0};
 332         Real y[4] = {0,0,0,0};
 333
 334         string token("");
 335         string command("m");
 336
 337         Real x0(0);
 338         Real y0(0);
 339
 340         unsigned i = 0;
 341         unsigned prev_i = 0;
 342
 343         bool start = false;
 344
 345         while (i < d.size() && GetToken(d, token, i).size() > 0)
 346         {
 347                 if (isalpha(token[0]))
 348                         command = token;
 349                 else
 350                 {
 351                         i = prev_i; // hax
 352                         if(command == "")
 353                                 command = "L";
 354                 }
 355
 356                 bool relative = islower(command[0]);
 357
 358                 if (command == "m" || command == "M")
 359                 {
 360                         Debug("Construct moveto command");
 361                         Real dx = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.w;
 362                         assert(GetToken(d,token,i) == ",");
 363                         Real dy = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.h;
 364
 365                         x[0] = (relative) ? x[0] + dx : dx;
 366                         y[0] = (relative) ? y[0] + dy : dy;
 367
 368
 369
 370                         Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 371                         command = (command == "m") ? "l" : "L";
 372                 }
 373                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 374                 {
 375                         Debug("Construct curveto command");
 376                         Real dx = strtod(GetToken(d,token,i).c_str(),NULL)/bounds.w;
 377                         assert(GetToken(d,token,i) == ",");
 378                         Real dy = strtod(GetToken(d,token,i).c_str(),NULL)/bounds.h;
 379
 380                         x[1] = (relative) ? x[0] + dx : dx;
 381                         y[1] = (relative) ? y[0] + dy : dy;
 382
 383                         dx = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.w;
 384                         assert(GetToken(d,token,i) == ",");
 385                         dy = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.h;
 386
 387                         x[2] = (relative) ? x[0] + dx : dx;
 388                         y[2] = (relative) ? y[0] + dy : dy;
 389
 390                         if (command != "q" && command != "Q")
 391                         {
 392                                 dx = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.w;
 393                                 assert(GetToken(d,token,i) == ",");
 394                                 dy = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.h;
 395                                 x[3] = (relative) ? x[0] + dx : dx;
 396                                 y[3] = (relative) ? y[0] + dy : dy;
 397                         }
 398                         else
 399                         {
 400                                 x[3] = x[2];
 401                                 y[3] = y[2];
 402                         }
 403
 404                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 405                         Add(BEZIER,Rect(0,0,1,1),index);
 406
 407
 408                         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]));
 409
 410                         x[0] = x[3];
 411                         y[0] = y[3];
 412
 413
 414                 }
 415                 else if (command == "l" || command == "L")
 416                 {
 417                         Debug("Construct lineto command");
 418
 419                         Real dx = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.w;
 420                         assert(GetToken(d,token,i) == ",");
 421                         Real dy = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.h;
 422
 423                         x[1] = (relative) ? x0 + dx : dx;
 424                         y[1] = (relative) ? y0 + dy : dy;
 425
 426                         x[2] = x[1];
 427                         y[2] = y[1];
 428
 429                         x[3] = x[1];
 430                         y[3] = y[1];
 431
 432                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 433                         Add(BEZIER,Rect(0,0,1,1),index);
 434
 435                         Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 436
 437                         x[0] = x[3];
 438                         y[0] = y[3];
 439
 440                 }
 441                 else if (command == "z" || command == "Z")
 442                 {
 443                         Debug("Construct returnto command");
 444                         x[1] = x0;
 445                         y[1] = y0;
 446                         x[2] = x0;
 447                         y[2] = y0;
 448                         x[3] = x0;
 449                         y[3] = y0;
 450
 451                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 452                         Add(BEZIER,Rect(0,0,1,1),index);
 453
 454                         Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 455
 456                         x[0] = x[3];
 457                         y[0] = y[3];
 458                         command = "m";
 459                 }
 460                 else
 461                 {
 462                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 463                         command = "m";
 464                 }
 465
 466                 if (!start)
 467                 {
 468                         x0 = x[0];
 469                         y0 = y[0];
 470                         start = true;
 471                 }
 472                 prev_i = i;
 473         }
 474 }