src/document.cpp

   1 #include "document.h"
   2 #include "bezier.h"
   3 #include <cstdio>
   4 #include <fstream>
   5
   6 #include "stb_truetype.h"
   7
   8 using namespace IPDF;
   9 using namespace std;
  10
  11 //TODO: Make this work for variable sized Reals
  12
  13 // Loads an std::vector<T> of size num_elements from a file.
  14 template<typename T>
  15 static void LoadStructVector(FILE *src_file, size_t num_elems, std::vector<T>& dest)
  16 {
  17         size_t structsread = 0;
  18         dest.resize(num_elems);
  19         structsread = fread(dest.data(), sizeof(T), num_elems, src_file);
  20         if (structsread != num_elems)
  21                 Fatal("Only read %u structs (expected %u)!", structsread, num_elems);
  22 }
  23
  24 // Saves an std::vector<T> to a file. Size must be saves separately.
  25 template<typename T>
  26 static void SaveStructVector(FILE *dst_file, std::vector<T>& src)
  27 {
  28         size_t written = 0;
  29         written = fwrite(src.data(), sizeof(T), src.size(), dst_file);
  30         if (written != src.size())
  31                 Fatal("Only wrote %u structs (expected %u)!", written, src.size());
  32 }
  33
  34 static void WriteChunkHeader(FILE *dst_file, DocChunkTypes type, uint32_t size)
  35 {
  36         size_t written = 0;
  37         written = fwrite(&type, sizeof(type), 1, dst_file);
  38         if (written != 1)
  39                 Fatal("Could not write Chunk header! (ID)");
  40         written = fwrite(&size, sizeof(size), 1, dst_file);
  41         if (written != 1)
  42                 Fatal("Could not write Chunk header (size)!");
  43 }
  44
  45 static bool ReadChunkHeader(FILE *src_file, DocChunkTypes& type, uint32_t& size)
  46 {
  47         if (fread(&type, sizeof(DocChunkTypes), 1, src_file) != 1)
  48                 return false;
  49         if (fread(&size, sizeof(uint32_t), 1, src_file) != 1)
  50                 return false;
  51         return true;
  52 }
  53
  54 void Document::Save(const string & filename)
  55 {
  56         Debug("Saving document to file \"%s\"...", filename.c_str());
  57         FILE * file = fopen(filename.c_str(), "w");
  58         if (file == NULL)
  59                 Fatal("Couldn't open file \"%s\" - %s", filename.c_str(), strerror(errno));
  60
  61         size_t written;
  62         Debug("Number of objects (%u)...", ObjectCount());
  63         WriteChunkHeader(file, CT_NUMOBJS, sizeof(m_count));
  64         written = fwrite(&m_count, sizeof(m_count), 1, file);
  65         if (written != 1)
  66                 Fatal("Failed to write number of objects!");
  67
  68         Debug("Object types...");
  69         WriteChunkHeader(file, CT_OBJTYPES, m_objects.types.size() * sizeof(ObjectType));
  70         SaveStructVector<ObjectType>(file, m_objects.types);
  71
  72         Debug("Object bounds...");
  73         WriteChunkHeader(file, CT_OBJBOUNDS, m_objects.bounds.size() * sizeof(Rect));
  74         SaveStructVector<Rect>(file, m_objects.bounds);
  75
  76         Debug("Object data indices...");
  77         WriteChunkHeader(file, CT_OBJINDICES, m_objects.data_indices.size() * sizeof(unsigned));
  78         SaveStructVector<unsigned>(file, m_objects.data_indices);
  79
  80         Debug("Bezier data...");
  81         WriteChunkHeader(file, CT_OBJBEZIERS, m_objects.beziers.size() * sizeof(uint8_t));
  82         SaveStructVector<Bezier>(file, m_objects.beziers);
  83
  84         int err = fclose(file);
  85         if (err != 0)
  86                 Fatal("Failed to close file \"%s\" - %s", filename.c_str(), strerror(err));
  87
  88         Debug("Successfully saved %u objects to \"%s\"", ObjectCount(), filename.c_str());
  89 }
  90
  91 #ifndef QUADTREE_DISABLED
  92
  93 void Document::GenBaseQuadtree()
  94 {
  95         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QTC_UNKNOWN, 0, ObjectCount()});
  96         m_quadtree.root_id = 0;
  97         GenQuadChild(0, QTC_TOP_LEFT);
  98 }
  99
 100 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 101 {
 102         QuadTreeIndex new_index = m_quadtree.nodes.size();
 103         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 104
 105         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 106         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 107         {
 108                 if (ContainedInQuadChild(m_objects.bounds[i], type))
 109                 {
 110                         m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[i], type));
 111                         m_objects.types.push_back(m_objects.types[i]);
 112                         m_objects.data_indices.push_back(m_objects.data_indices[i]);
 113                         m_count++;
 114                 }
 115         }
 116         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 117         switch (type)
 118         {
 119                 case QTC_TOP_LEFT:
 120                         m_quadtree.nodes[parent].top_left = new_index;
 121                         break;
 122                 case QTC_TOP_RIGHT:
 123                         m_quadtree.nodes[parent].top_right = new_index;
 124                         break;
 125                 case QTC_BOTTOM_LEFT:
 126                         m_quadtree.nodes[parent].bottom_left = new_index;
 127                         break;
 128                 case QTC_BOTTOM_RIGHT:
 129                         m_quadtree.nodes[parent].bottom_right = new_index;
 130                         break;
 131                 default:
 132                         Fatal("Tried to add a QuadTree child of invalid type!");
 133         }
 134         return new_index;
 135 }
 136
 137 // Reparent a quadtree node, making it the "type" child of a new node.
 138 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 139 {
 140         QuadTreeIndex new_index = m_quadtree.nodes.size();
 141         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
 142
 143         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 144         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 145         {
 146                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 147                 m_objects.types.push_back(m_objects.types[i]);
 148                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 149                 m_count++;
 150         }
 151         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 152         switch (type)
 153         {
 154                 case QTC_TOP_LEFT:
 155                         m_quadtree.nodes[new_index].top_left = child;
 156                         break;
 157                 case QTC_TOP_RIGHT:
 158                         m_quadtree.nodes[new_index].top_right = child;
 159                         break;
 160                 case QTC_BOTTOM_LEFT:
 161                         m_quadtree.nodes[new_index].bottom_left = child;
 162                         break;
 163                 case QTC_BOTTOM_RIGHT:
 164                         m_quadtree.nodes[new_index].bottom_right = child;
 165                         break;
 166                 default:
 167                         Fatal("Tried to add a QuadTree child of invalid type!");
 168         }
 169         return new_index;
 170 }
 171
 172 #endif
 173
 174 void Document::Load(const string & filename)
 175 {
 176         m_objects.bounds.clear();
 177         m_count = 0;
 178         if (filename == "")
 179         {
 180                 Debug("Loaded empty document.");
 181                 return;
 182         }
 183         Debug("Loading document from file \"%s\"", filename.c_str());
 184         FILE * file = fopen(filename.c_str(), "r");
 185         if (file == NULL)
 186                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 187
 188         size_t read;
 189
 190         DocChunkTypes chunk_type;
 191         uint32_t chunk_size;
 192         while (ReadChunkHeader(file, chunk_type, chunk_size))
 193         {
 194                 switch(chunk_type)
 195                 {
 196                 case CT_NUMOBJS:
 197                         read = fread(&m_count, sizeof(m_count), 1, file);
 198                         if (read != 1)
 199                                 Fatal("Failed to read number of objects!");
 200                         Debug("Number of objects: %u", ObjectCount());
 201                         break;
 202                 case CT_OBJTYPES:
 203                         Debug("Object types...");
 204                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 205                         break;
 206                 case CT_OBJBOUNDS:
 207                         Debug("Object bounds...");
 208                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 209                         break;
 210                 case CT_OBJINDICES:
 211                         Debug("Object data indices...");
 212                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 213                         break;
 214                 case CT_OBJBEZIERS:
 215                         Debug("Bezier data...");
 216                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 217                         break;
 218                 }
 219         }
 220         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 221 #ifndef QUADTREE_DISABLED
 222         if (m_quadtree.root_id == QUADTREE_EMPTY)
 223         {
 224                 GenBaseQuadtree();
 225         }
 226 #endif
 227 }
 228
 229 void Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 230 {
 231         m_objects.types.push_back(type);
 232         m_objects.bounds.push_back(bounds);
 233         m_objects.data_indices.push_back(data_index);
 234         ++m_count; // Why can't we just use the size of types or something?
 235 }
 236
 237 unsigned Document::AddBezierData(const Bezier & bezier)
 238 {
 239         m_objects.beziers.push_back(bezier);
 240         return m_objects.beziers.size()-1;
 241 }
 242
 243
 244 void Document::DebugDumpObjects()
 245 {
 246         Debug("Objects for Document %p are:", this);
 247         for (unsigned id = 0; id < ObjectCount(); ++id)
 248         {
 249                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 250         }
 251 }
 252
 253 bool Document::operator==(const Document & equ) const
 254 {
 255         return (ObjectCount() == equ.ObjectCount()
 256                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 257                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 258                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 259 }
 260
 261
 262 #include "../contrib/pugixml-1.4/src/pugixml.hpp"
 263 #include "../contrib/pugixml-1.4/src/pugixml.cpp"
 264
 265 /**
 266  * Load an SVG into a rectangle
 267  */
 268 void Document::LoadSVG(const string & filename, const Rect & bounds)
 269 {
 270         using namespace pugi;
 271
 272         xml_document doc_xml;
 273         ifstream input(filename.c_str(), ios_base::in);
 274         xml_parse_result result = doc_xml.load(input);
 275
 276         if (!result)
 277                 Fatal("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 278
 279         Debug("Loaded XML - %s", result.description());
 280
 281         input.close();
 282
 283         // Combine all SVG tags into one thing because lazy
 284         for (xml_node svg : doc_xml.children("svg"))
 285         {
 286                 Real width = Real(svg.attribute("width").as_float()) * bounds.w;
 287                 Real height = Real(svg.attribute("width").as_float()) * bounds.h;
 288
 289
 290                 // Rectangles
 291                 Real coords[4];
 292                 const char * attrib_names[] = {"x", "y", "width", "height"};
 293                 for (pugi::xml_node rect : svg.children("rect"))
 294                 {
 295                         for (size_t i = 0; i < 4; ++i)
 296                                 coords[i] = rect.attribute(attrib_names[i]).as_float();
 297
 298                         bool outline = !(rect.attribute("fill"));
 299                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0]/width + bounds.x, coords[1]/height + bounds.y, coords[2]/width, coords[3]/height),0);
 300                         Debug("Added rectangle");
 301                 }
 302
 303                 // Circles
 304                 for (pugi::xml_node circle : svg.children("circle"))
 305                 {
 306                         Real cx = circle.attribute("cx").as_float();
 307                         Real cy = circle.attribute("cy").as_float();
 308                         Real r = circle.attribute("r").as_float();
 309
 310                         Real x = (cx - r)/width + bounds.x;
 311                         Real y = (cy - r)/height + bounds.y;
 312                         Real w = Real(2)*r/width;
 313                         Real h = Real(2)*r/height;
 314
 315                         Rect rect(x,y,w,h);
 316                         Add(CIRCLE_FILLED, rect,0);
 317                         Debug("Added Circle %s", rect.Str().c_str());
 318
 319                 }
 320
 321                 // paths
 322                 for (pugi::xml_node path : svg.children("path"))
 323                 {
 324
 325                         string d = path.attribute("d").as_string();
 326                         Debug("Path data attribute is \"%s\"", d.c_str());
 327                         AddPathFromString(d, Rect(bounds.x,bounds.y,width,height));
 328
 329                 }
 330         }
 331
 332         //Fatal("Done");
 333
 334
 335
 336 }
 337
 338 // Behold my amazing tokenizing abilities
 339 static string & GetToken(const string & d, string & token, unsigned & i)
 340 {
 341         token.clear();
 342         while (i < d.size() && iswspace(d[i]))
 343         {
 344                 ++i;
 345         }
 346
 347         while (i < d.size())
 348         {
 349                 if (d[i] == ',' || (isalpha(d[i]) && d[i] != 'e') || iswspace(d[i]))
 350                 {
 351                         if (token.size() == 0 && !iswspace(d[i]))
 352                         {
 353                                 token += d[i++];
 354                         }
 355                         break;
 356                 }
 357                 token += d[i++];
 358         }
 359         Debug("Got token \"%s\"", token.c_str());
 360         return token;
 361 }
 362
 363
 364 // Fear the wrath of the tokenizing svg data
 365 // Seriously this isn't really very DOM-like at all is it?
 366 void Document::AddPathFromString(const string & d, const Rect & bounds)
 367 {
 368         Real x[4] = {0,0,0,0};
 369         Real y[4] = {0,0,0,0};
 370
 371         string token("");
 372         string command("m");
 373
 374         Real x0(0);
 375         Real y0(0);
 376
 377         unsigned i = 0;
 378         unsigned prev_i = 0;
 379
 380         bool start = false;
 381
 382         while (i < d.size() && GetToken(d, token, i).size() > 0)
 383         {
 384                 if (isalpha(token[0]))
 385                         command = token;
 386                 else
 387                 {
 388                         i = prev_i; // hax
 389                         if(command == "")
 390                                 command = "L";
 391                 }
 392
 393                 bool relative = islower(command[0]);
 394
 395                 if (command == "m" || command == "M")
 396                 {
 397                         Debug("Construct moveto command");
 398                         Real dx = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.w;
 399                         assert(GetToken(d,token,i) == ",");
 400                         Real dy = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.h;
 401
 402                         x[0] = (relative) ? x[0] + dx : dx;
 403                         y[0] = (relative) ? y[0] + dy : dy;
 404
 405
 406
 407                         Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 408                         command = (command == "m") ? "l" : "L";
 409                 }
 410                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 411                 {
 412                         Debug("Construct curveto command");
 413                         Real dx = Real(strtod(GetToken(d,token,i).c_str(),NULL))/bounds.w;
 414                         assert(GetToken(d,token,i) == ",");
 415                         Real dy = Real(strtod(GetToken(d,token,i).c_str(),NULL))/bounds.h;
 416
 417                         x[1] = (relative) ? x[0] + dx : dx;
 418                         y[1] = (relative) ? y[0] + dy : dy;
 419
 420                         dx = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.w;
 421                         assert(GetToken(d,token,i) == ",");
 422                         dy = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.h;
 423
 424                         x[2] = (relative) ? x[0] + dx : dx;
 425                         y[2] = (relative) ? y[0] + dy : dy;
 426
 427                         if (command != "q" && command != "Q")
 428                         {
 429                                 dx = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.w;
 430                                 assert(GetToken(d,token,i) == ",");
 431                                 dy = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.h;
 432                                 x[3] = (relative) ? x[0] + dx : dx;
 433                                 y[3] = (relative) ? y[0] + dy : dy;
 434                         }
 435                         else
 436                         {
 437                                 x[3] = x[2];
 438                                 y[3] = y[2];
 439                                 Real old_x1(x[1]), old_y1(y[1]);
 440                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 441                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 442                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 443                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 444                         }
 445
 446                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 447                         Add(BEZIER,Rect(0,0,1,1),index);
 448
 449
 450                         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]));
 451
 452                         x[0] = x[3];
 453                         y[0] = y[3];
 454
 455
 456                 }
 457                 else if (command == "l" || command == "L")
 458                 {
 459                         Debug("Construct lineto command");
 460
 461                         Real dx = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.w;
 462                         assert(GetToken(d,token,i) == ",");
 463                         Real dy = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.h;
 464
 465                         x[1] = (relative) ? x[0] + dx : dx;
 466                         y[1] = (relative) ? y[0] + dy : dy;
 467
 468                         x[2] = x[1];
 469                         y[2] = y[1];
 470
 471                         x[3] = x[1];
 472                         y[3] = y[1];
 473
 474                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 475                         Add(BEZIER,Rect(0,0,1,1),index);
 476
 477                         Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 478
 479                         x[0] = x[3];
 480                         y[0] = y[3];
 481
 482                 }
 483                 else if (command == "z" || command == "Z")
 484                 {
 485                         Debug("Construct returnto command");
 486                         x[1] = x0;
 487                         y[1] = y0;
 488                         x[2] = x0;
 489                         y[2] = y0;
 490                         x[3] = x0;
 491                         y[3] = y0;
 492
 493                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 494                         Add(BEZIER,Rect(0,0,1,1),index);
 495
 496                         Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 497
 498                         x[0] = x[3];
 499                         y[0] = y[3];
 500                         command = "m";
 501                 }
 502                 else
 503                 {
 504                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 505                         command = "m";
 506                 }
 507
 508                 if (!start)
 509                 {
 510                         x0 = x[0];
 511                         y0 = y[0];
 512                         start = true;
 513                 }
 514                 prev_i = i;
 515         }
 516 }
 517
 518 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 519 {
 520         int glyph_index = stbtt_FindGlyphIndex(font, character);
 521
 522         // Check if there is actully a glyph to render.
 523         if (stbtt_IsGlyphEmpty(font, glyph_index))
 524         {
 525                 return;
 526         }
 527
 528         stbtt_vertex *instructions;
 529         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 530
 531         Real current_x(0), current_y(0);
 532
 533         for (int i = 0; i < num_instructions; ++i)
 534         {
 535                 // TTF uses 16-bit signed ints for coordinates:
 536                 // with the y-axis inverted compared to us.
 537                 // Convert and scale any data.
 538                 Real inst_x = Real(instructions[i].x)*scale;
 539                 Real inst_y = Real(instructions[i].y)*-scale;
 540                 Real inst_cx = Real(instructions[i].cx)*scale;
 541                 Real inst_cy = Real(instructions[i].cy)*-scale;
 542                 Real old_x(current_x), old_y(current_y);
 543                 current_x = inst_x;
 544                 current_y = inst_y;
 545                 unsigned bezier_index;
 546                 switch(instructions[i].type)
 547                 {
 548                 // Move To
 549                 case STBTT_vmove:
 550                         break;
 551                 // Line To
 552                 case STBTT_vline:
 553                         bezier_index = AddBezierData(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));
 554                         Add(BEZIER,Rect(0,0,1,1),bezier_index);
 555                         break;
 556                 // Quadratic Bezier To:
 557                 case STBTT_vcurve:
 558                         // Quadratic -> Cubic:
 559                         // - Endpoints are the same.
 560                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
 561                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
 562                         bezier_index = AddBezierData(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,
 563                                                 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));
 564                         Add(BEZIER,Rect(0,0,1,1),bezier_index);
 565                         break;
 566                 }
 567         }
 568
 569         stbtt_FreeShape(font, instructions);
 570 }