Béziers magically work with the QuadTree (sometimes)
[ipdf/code.git] / 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 }

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