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         GenQuadParent(0, QTC_BOTTOM_RIGHT);
  99 }
 100
 101 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
 102 {
 103         QuadTreeIndex new_index = m_quadtree.nodes.size();
 104         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
 105
 106         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 107         for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
 108         {
 109                 if (ContainedInQuadChild(m_objects.bounds[i], type))
 110                 {
 111                         m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[i], type));
 112                         m_objects.types.push_back(m_objects.types[i]);
 113                         m_objects.data_indices.push_back(m_objects.data_indices[i]);
 114                         m_count++;
 115                 }
 116         }
 117         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 118         switch (type)
 119         {
 120                 case QTC_TOP_LEFT:
 121                         m_quadtree.nodes[parent].top_left = new_index;
 122                         break;
 123                 case QTC_TOP_RIGHT:
 124                         m_quadtree.nodes[parent].top_right = new_index;
 125                         break;
 126                 case QTC_BOTTOM_LEFT:
 127                         m_quadtree.nodes[parent].bottom_left = new_index;
 128                         break;
 129                 case QTC_BOTTOM_RIGHT:
 130                         m_quadtree.nodes[parent].bottom_right = new_index;
 131                         break;
 132                 default:
 133                         Fatal("Tried to add a QuadTree child of invalid type!");
 134         }
 135         return new_index;
 136 }
 137
 138 // Reparent a quadtree node, making it the "type" child of a new node.
 139 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
 140 {
 141         QuadTreeIndex new_index = m_quadtree.nodes.size();
 142         m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
 143
 144         m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
 145         for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
 146         {
 147                 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
 148                 m_objects.types.push_back(m_objects.types[i]);
 149                 m_objects.data_indices.push_back(m_objects.data_indices[i]);
 150                 m_count++;
 151         }
 152         m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
 153         switch (type)
 154         {
 155                 case QTC_TOP_LEFT:
 156                         m_quadtree.nodes[new_index].top_left = child;
 157                         break;
 158                 case QTC_TOP_RIGHT:
 159                         m_quadtree.nodes[new_index].top_right = child;
 160                         break;
 161                 case QTC_BOTTOM_LEFT:
 162                         m_quadtree.nodes[new_index].bottom_left = child;
 163                         break;
 164                 case QTC_BOTTOM_RIGHT:
 165                         m_quadtree.nodes[new_index].bottom_right = child;
 166                         break;
 167                 default:
 168                         Fatal("Tried to add a QuadTree child of invalid type!");
 169         }
 170         return new_index;
 171 }
 172
 173 #endif
 174
 175 void Document::Load(const string & filename)
 176 {
 177         m_objects.bounds.clear();
 178         m_count = 0;
 179         if (filename == "")
 180         {
 181                 Debug("Loaded empty document.");
 182                 return;
 183         }
 184         Debug("Loading document from file \"%s\"", filename.c_str());
 185         FILE * file = fopen(filename.c_str(), "r");
 186         if (file == NULL)
 187                 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 188
 189         size_t read;
 190
 191         DocChunkTypes chunk_type;
 192         uint32_t chunk_size;
 193         while (ReadChunkHeader(file, chunk_type, chunk_size))
 194         {
 195                 switch(chunk_type)
 196                 {
 197                 case CT_NUMOBJS:
 198                         read = fread(&m_count, sizeof(m_count), 1, file);
 199                         if (read != 1)
 200                                 Fatal("Failed to read number of objects!");
 201                         Debug("Number of objects: %u", ObjectCount());
 202                         break;
 203                 case CT_OBJTYPES:
 204                         Debug("Object types...");
 205                         LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
 206                         break;
 207                 case CT_OBJBOUNDS:
 208                         Debug("Object bounds...");
 209                         LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
 210                         break;
 211                 case CT_OBJINDICES:
 212                         Debug("Object data indices...");
 213                         LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
 214                         break;
 215                 case CT_OBJBEZIERS:
 216                         Debug("Bezier data...");
 217                         LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 218                         break;
 219                 }
 220         }
 221         Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
 222 #ifndef QUADTREE_DISABLED
 223         if (m_quadtree.root_id == QUADTREE_EMPTY)
 224         {
 225                 GenBaseQuadtree();
 226         }
 227 #endif
 228 }
 229
 230 void Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 231 {
 232         m_objects.types.push_back(type);
 233         m_objects.bounds.push_back(bounds);
 234         m_objects.data_indices.push_back(data_index);
 235         ++m_count; // Why can't we just use the size of types or something?
 236 }
 237
 238 unsigned Document::AddBezierData(const Bezier & bezier)
 239 {
 240         m_objects.beziers.push_back(bezier);
 241         return m_objects.beziers.size()-1;
 242 }
 243
 244
 245 void Document::DebugDumpObjects()
 246 {
 247         Debug("Objects for Document %p are:", this);
 248         for (unsigned id = 0; id < ObjectCount(); ++id)
 249         {
 250                 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
 251         }
 252 }
 253
 254 bool Document::operator==(const Document & equ) const
 255 {
 256         return (ObjectCount() == equ.ObjectCount()
 257                 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
 258                 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 259                 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 260 }
 261
 262
 263 #include "../contrib/pugixml-1.4/src/pugixml.hpp"
 264 #include "../contrib/pugixml-1.4/src/pugixml.cpp"
 265
 266 /**
 267  * Load an SVG into a rectangle
 268  */
 269 void Document::LoadSVG(const string & filename, const Rect & bounds)
 270 {
 271         using namespace pugi;
 272
 273         xml_document doc_xml;
 274         ifstream input(filename.c_str(), ios_base::in);
 275         xml_parse_result result = doc_xml.load(input);
 276
 277         if (!result)
 278                 Fatal("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
 279
 280         Debug("Loaded XML - %s", result.description());
 281
 282         input.close();
 283
 284         // Combine all SVG tags into one thing because lazy
 285         for (xml_node svg : doc_xml.children("svg"))
 286         {
 287                 Real width = svg.attribute("width").as_float() * bounds.w;
 288                 Real height = svg.attribute("width").as_float() * bounds.h;
 289
 290
 291                 // Rectangles
 292                 Real coords[4];
 293                 const char * attrib_names[] = {"x", "y", "width", "height"};
 294                 for (pugi::xml_node rect : svg.children("rect"))
 295                 {
 296                         for (size_t i = 0; i < 4; ++i)
 297                                 coords[i] = rect.attribute(attrib_names[i]).as_float();
 298
 299                         bool outline = !(rect.attribute("fill"));
 300                         Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0]/width + bounds.x, coords[1]/height + bounds.y, coords[2]/width, coords[3]/height),0);
 301                         Debug("Added rectangle");
 302                 }
 303
 304                 // Circles
 305                 for (pugi::xml_node circle : svg.children("circle"))
 306                 {
 307                         Real cx = circle.attribute("cx").as_float();
 308                         Real cy = circle.attribute("cy").as_float();
 309                         Real r = circle.attribute("r").as_float();
 310
 311                         Real x = (cx - r)/width + bounds.x;
 312                         Real y = (cy - r)/height + bounds.y;
 313                         Real w = 2*r/width;
 314                         Real h = 2*r/height;
 315
 316                         Rect rect(x,y,w,h);
 317                         Add(CIRCLE_FILLED, rect,0);
 318                         Debug("Added Circle %s", rect.Str().c_str());
 319
 320                 }
 321
 322                 // paths
 323                 for (pugi::xml_node path : svg.children("path"))
 324                 {
 325
 326                         string d = path.attribute("d").as_string();
 327                         Debug("Path data attribute is \"%s\"", d.c_str());
 328                         AddPathFromString(d, Rect(bounds.x,bounds.y,width,height));
 329
 330                 }
 331         }
 332
 333         //Fatal("Done");
 334
 335
 336
 337 }
 338
 339 // Behold my amazing tokenizing abilities
 340 static string & GetToken(const string & d, string & token, unsigned & i)
 341 {
 342         token.clear();
 343         while (i < d.size() && iswspace(d[i]))
 344         {
 345                 ++i;
 346         }
 347
 348         while (i < d.size())
 349         {
 350                 if (d[i] == ',' || (isalpha(d[i]) && d[i] != 'e') || iswspace(d[i]))
 351                 {
 352                         if (token.size() == 0 && !iswspace(d[i]))
 353                         {
 354                                 token += d[i++];
 355                         }
 356                         break;
 357                 }
 358                 token += d[i++];
 359         }
 360         Debug("Got token \"%s\"", token.c_str());
 361         return token;
 362 }
 363
 364
 365 // Fear the wrath of the tokenizing svg data
 366 // Seriously this isn't really very DOM-like at all is it?
 367 void Document::AddPathFromString(const string & d, const Rect & bounds)
 368 {
 369         Real x[4] = {0,0,0,0};
 370         Real y[4] = {0,0,0,0};
 371
 372         string token("");
 373         string command("m");
 374
 375         Real x0(0);
 376         Real y0(0);
 377
 378         unsigned i = 0;
 379         unsigned prev_i = 0;
 380
 381         bool start = false;
 382
 383         while (i < d.size() && GetToken(d, token, i).size() > 0)
 384         {
 385                 if (isalpha(token[0]))
 386                         command = token;
 387                 else
 388                 {
 389                         i = prev_i; // hax
 390                         if(command == "")
 391                                 command = "L";
 392                 }
 393
 394                 bool relative = islower(command[0]);
 395
 396                 if (command == "m" || command == "M")
 397                 {
 398                         Debug("Construct moveto command");
 399                         Real dx = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.w;
 400                         assert(GetToken(d,token,i) == ",");
 401                         Real dy = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.h;
 402
 403                         x[0] = (relative) ? x[0] + dx : dx;
 404                         y[0] = (relative) ? y[0] + dy : dy;
 405
 406
 407
 408                         Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
 409                         command = (command == "m") ? "l" : "L";
 410                 }
 411                 else if (command == "c" || command == "C" || command == "q" || command == "Q")
 412                 {
 413                         Debug("Construct curveto command");
 414                         Real dx = strtod(GetToken(d,token,i).c_str(),NULL)/bounds.w;
 415                         assert(GetToken(d,token,i) == ",");
 416                         Real dy = strtod(GetToken(d,token,i).c_str(),NULL)/bounds.h;
 417
 418                         x[1] = (relative) ? x[0] + dx : dx;
 419                         y[1] = (relative) ? y[0] + dy : dy;
 420
 421                         dx = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.w;
 422                         assert(GetToken(d,token,i) == ",");
 423                         dy = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.h;
 424
 425                         x[2] = (relative) ? x[0] + dx : dx;
 426                         y[2] = (relative) ? y[0] + dy : dy;
 427
 428                         if (command != "q" && command != "Q")
 429                         {
 430                                 dx = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.w;
 431                                 assert(GetToken(d,token,i) == ",");
 432                                 dy = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.h;
 433                                 x[3] = (relative) ? x[0] + dx : dx;
 434                                 y[3] = (relative) ? y[0] + dy : dy;
 435                         }
 436                         else
 437                         {
 438                                 x[3] = x[2];
 439                                 y[3] = y[2];
 440                                 Real old_x1(x[1]), old_y1(y[1]);
 441                                 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
 442                                 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
 443                                 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
 444                                 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
 445                         }
 446
 447                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 448                         Add(BEZIER,Rect(0,0,1,1),index);
 449
 450
 451                         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]));
 452
 453                         x[0] = x[3];
 454                         y[0] = y[3];
 455
 456
 457                 }
 458                 else if (command == "l" || command == "L")
 459                 {
 460                         Debug("Construct lineto command");
 461
 462                         Real dx = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.w;
 463                         assert(GetToken(d,token,i) == ",");
 464                         Real dy = strtod(GetToken(d,token,i).c_str(),NULL) / bounds.h;
 465
 466                         x[1] = (relative) ? x[0] + dx : dx;
 467                         y[1] = (relative) ? y[0] + dy : dy;
 468
 469                         x[2] = x[1];
 470                         y[2] = y[1];
 471
 472                         x[3] = x[1];
 473                         y[3] = y[1];
 474
 475                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 476                         Add(BEZIER,Rect(0,0,1,1),index);
 477
 478                         Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 479
 480                         x[0] = x[3];
 481                         y[0] = y[3];
 482
 483                 }
 484                 else if (command == "z" || command == "Z")
 485                 {
 486                         Debug("Construct returnto command");
 487                         x[1] = x0;
 488                         y[1] = y0;
 489                         x[2] = x0;
 490                         y[2] = y0;
 491                         x[3] = x0;
 492                         y[3] = y0;
 493
 494                         unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
 495                         Add(BEZIER,Rect(0,0,1,1),index);
 496
 497                         Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
 498
 499                         x[0] = x[3];
 500                         y[0] = y[3];
 501                         command = "m";
 502                 }
 503                 else
 504                 {
 505                         Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
 506                         command = "m";
 507                 }
 508
 509                 if (!start)
 510                 {
 511                         x0 = x[0];
 512                         y0 = y[0];
 513                         start = true;
 514                 }
 515                 prev_i = i;
 516         }
 517 }
 518
 519 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
 520 {
 521         int glyph_index = stbtt_FindGlyphIndex(font, character);
 522
 523         // Check if there is actully a glyph to render.
 524         if (stbtt_IsGlyphEmpty(font, glyph_index))
 525         {
 526                 return;
 527         }
 528
 529         stbtt_vertex *instructions;
 530         int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
 531
 532         Real current_x(0), current_y(0);
 533
 534         for (int i = 0; i < num_instructions; ++i)
 535         {
 536                 // TTF uses 16-bit signed ints for coordinates:
 537                 // with the y-axis inverted compared to us.
 538                 // Convert and scale any data.
 539                 Real inst_x = Real(instructions[i].x)*scale;
 540                 Real inst_y = Real(instructions[i].y)*-scale;
 541                 Real inst_cx = Real(instructions[i].cx)*scale;
 542                 Real inst_cy = Real(instructions[i].cy)*-scale;
 543                 Real old_x(current_x), old_y(current_y);
 544                 current_x = inst_x;
 545                 current_y = inst_y;
 546                 unsigned bezier_index;
 547                 switch(instructions[i].type)
 548                 {
 549                 // Move To
 550                 case STBTT_vmove:
 551                         break;
 552                 // Line To
 553                 case STBTT_vline:
 554                         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));
 555                         Add(BEZIER,Rect(0,0,1,1),bezier_index);
 556                         break;
 557                 // Quadratic Bezier To:
 558                 case STBTT_vcurve:
 559                         // Quadratic -> Cubic:
 560                         // - Endpoints are the same.
 561                         // - cubic1 = quad0+(2/3)*(quad1-quad0)
 562                         // - cubic2 = quad2+(2/3)*(quad1-quad2)
 563                         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,
 564                                                 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));
 565                         Add(BEZIER,Rect(0,0,1,1),bezier_index);
 566                         break;
 567                 }
 568         }
 569
 570         stbtt_FreeShape(font, instructions);
 571 }