6 #include "../contrib/pugixml-1.4/src/pugixml.cpp"
8 #include "stb_truetype.h"
13 //TODO: Make this work for variable sized Reals
15 // Loads an std::vector<T> of size num_elements from a file.
17 static void LoadStructVector(FILE *src_file, size_t num_elems, std::vector<T>& dest)
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);
26 // Saves an std::vector<T> to a file. Size must be saves separately.
28 static void SaveStructVector(FILE *dst_file, std::vector<T>& src)
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());
36 static void WriteChunkHeader(FILE *dst_file, DocChunkTypes type, uint32_t size)
39 written = fwrite(&type, sizeof(type), 1, dst_file);
41 Fatal("Could not write Chunk header! (ID)");
42 written = fwrite(&size, sizeof(size), 1, dst_file);
44 Fatal("Could not write Chunk header (size)!");
47 static bool ReadChunkHeader(FILE *src_file, DocChunkTypes& type, uint32_t& size)
49 if (fread(&type, sizeof(DocChunkTypes), 1, src_file) != 1)
51 if (fread(&size, sizeof(uint32_t), 1, src_file) != 1)
56 void Document::Save(const string & filename)
58 Debug("Saving document to file \"%s\"...", filename.c_str());
59 FILE * file = fopen(filename.c_str(), "w");
61 Fatal("Couldn't open file \"%s\" - %s", filename.c_str(), strerror(errno));
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);
68 Fatal("Failed to write number of objects!");
70 Debug("Object types...");
71 WriteChunkHeader(file, CT_OBJTYPES, m_objects.types.size() * sizeof(ObjectType));
72 SaveStructVector<ObjectType>(file, m_objects.types);
74 Debug("Object bounds...");
75 WriteChunkHeader(file, CT_OBJBOUNDS, m_objects.bounds.size() * sizeof(Rect));
76 SaveStructVector<Rect>(file, m_objects.bounds);
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);
82 Debug("Bezier data...");
83 WriteChunkHeader(file, CT_OBJBEZIERS, m_objects.beziers.size() * sizeof(uint8_t));
84 SaveStructVector<Bezier>(file, m_objects.beziers);
86 int err = fclose(file);
88 Fatal("Failed to close file \"%s\" - %s", filename.c_str(), strerror(err));
90 Debug("Successfully saved %u objects to \"%s\"", ObjectCount(), filename.c_str());
93 #ifndef QUADTREE_DISABLED
95 void Document::GenBaseQuadtree()
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);
102 int Document::ClipObjectToQuadChild(int object_id, QuadTreeNodeChildren type)
104 switch (m_objects.types[object_id])
109 Rect obj_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
110 if (obj_bounds.x < 0)
112 obj_bounds.w += obj_bounds.x;
115 if (obj_bounds.y < 0)
117 obj_bounds.h += obj_bounds.y;
120 if (obj_bounds.x + obj_bounds.w > 1)
122 obj_bounds.w += (1 - (obj_bounds.x + obj_bounds.w));
124 if (obj_bounds.y + obj_bounds.h > 1)
126 obj_bounds.h += (1 - (obj_bounds.y + obj_bounds.h));
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]);
136 Debug("Adding %s -> %s", m_objects.bounds[object_id].Str().c_str(), TransformToQuadChild(m_objects.bounds[object_id], type).Str().c_str());
137 m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
138 m_objects.types.push_back(m_objects.types[object_id]);
139 m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
144 QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
146 QuadTreeIndex new_index = m_quadtree.nodes.size();
147 m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
149 m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
150 for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
152 if (IntersectsQuadChild(m_objects.bounds[i], type))
154 m_count += ClipObjectToQuadChild(i, type);
157 m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
161 m_quadtree.nodes[parent].top_left = new_index;
164 m_quadtree.nodes[parent].top_right = new_index;
166 case QTC_BOTTOM_LEFT:
167 m_quadtree.nodes[parent].bottom_left = new_index;
169 case QTC_BOTTOM_RIGHT:
170 m_quadtree.nodes[parent].bottom_right = new_index;
173 Fatal("Tried to add a QuadTree child of invalid type!");
178 // Reparent a quadtree node, making it the "type" child of a new node.
179 QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
181 QuadTreeIndex new_index = m_quadtree.nodes.size();
182 m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
184 m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
185 for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
187 m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
188 m_objects.types.push_back(m_objects.types[i]);
189 m_objects.data_indices.push_back(m_objects.data_indices[i]);
192 m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
196 m_quadtree.nodes[new_index].top_left = child;
199 m_quadtree.nodes[new_index].top_right = child;
201 case QTC_BOTTOM_LEFT:
202 m_quadtree.nodes[new_index].bottom_left = child;
204 case QTC_BOTTOM_RIGHT:
205 m_quadtree.nodes[new_index].bottom_right = child;
208 Fatal("Tried to add a QuadTree child of invalid type!");
215 void Document::Load(const string & filename)
217 m_objects.bounds.clear();
221 Debug("Loaded empty document.");
224 Debug("Loading document from file \"%s\"", filename.c_str());
225 FILE * file = fopen(filename.c_str(), "r");
227 Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
231 DocChunkTypes chunk_type;
233 while (ReadChunkHeader(file, chunk_type, chunk_size))
238 read = fread(&m_count, sizeof(m_count), 1, file);
240 Fatal("Failed to read number of objects!");
241 Debug("Number of objects: %u", ObjectCount());
244 Debug("Object types...");
245 LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
248 Debug("Object bounds...");
249 LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
252 Debug("Object data indices...");
253 LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
256 Debug("Bezier data...");
257 LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
261 Debug("Group data...");
262 Warn("Not handled because lazy");
266 Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
267 #ifndef QUADTREE_DISABLED
268 if (m_quadtree.root_id == QUADTREE_EMPTY)
275 unsigned Document::AddGroup(unsigned start_index, unsigned end_index)
277 Real xmin = 0; Real ymin = 0;
278 Real xmax = 0; Real ymax = 0;
280 for (unsigned i = start_index; i <= end_index; ++i)
282 Rect & objb = m_objects.bounds[i];
284 if (i == start_index || objb.x < xmin)
286 if (i == start_index || (objb.x+objb.w) > xmax)
287 xmax = (objb.x+objb.w);
289 if (i == start_index || objb.y < ymin)
291 if (i == start_index || (objb.y+objb.h) > ymax)
292 ymax = (objb.y+objb.h);
295 Rect bounds(xmin,ymin, xmax-xmin, ymax-ymin);
296 unsigned result = Add(GROUP, bounds,0);
297 m_objects.groups[m_count-1].first = start_index;
298 m_objects.groups[m_count-1].second = end_index;
303 * Add a Bezier using Absolute coords
305 unsigned Document::AddBezier(const Bezier & bezier)
307 Rect bounds = bezier.SolveBounds();
308 Bezier data = bezier.ToRelative(bounds); // Relative
309 unsigned index = AddBezierData(data);
310 return Add(BEZIER, bounds, index);
313 unsigned Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
315 m_objects.types.push_back(type);
316 m_objects.bounds.push_back(bounds);
317 m_objects.data_indices.push_back(data_index);
318 m_objects.groups.push_back(pair<unsigned, unsigned>(data_index, data_index));
319 return (m_count++); // Why can't we just use the size of types or something?
322 unsigned Document::AddBezierData(const Bezier & bezier)
324 m_objects.beziers.push_back(bezier);
325 return m_objects.beziers.size()-1;
329 void Document::DebugDumpObjects()
331 Debug("Objects for Document %p are:", this);
332 for (unsigned id = 0; id < ObjectCount(); ++id)
334 Debug("%u. \tType: %u\tBounds: %s", id, m_objects.types[id], m_objects.bounds[id].Str().c_str());
338 bool Document::operator==(const Document & equ) const
340 return (ObjectCount() == equ.ObjectCount()
341 && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
342 && memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
343 && memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
348 // Behold my amazing tokenizing abilities
349 static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
352 while (i < d.size() && iswspace(d[i]))
359 if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
361 if (token.size() == 0 && !iswspace(d[i]))
369 //Debug("Got token \"%s\"", token.c_str());
373 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
376 while (GetToken(d, token, i, delims) == ",");
377 x = strtod(token.c_str(),NULL);
378 if (GetToken(d, token, i, delims) != ",")
380 Fatal("Expected \",\" seperating x,y pair");
382 y = strtod(GetToken(d, token, i, delims).c_str(),NULL);
385 static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
388 x = transform.a * x + transform.c * y + transform.e;
389 y = transform.b * x0 + transform.d * y + transform.f;
392 void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
394 //Debug("Parsing transform %s", s.c_str());
401 GetToken(s, command, i);
402 if (command == "," || command == "" || command == ":")
405 GetToken(s, command, i);
409 //Debug("Token is \"%s\"", command.c_str());
411 SVGMatrix delta = {1,0,0,0,1,0};
414 assert(GetToken(s,token, i) == "(");
415 if (command == "translate")
417 GetXYPair(s, delta.e, delta.f, i);
418 assert(GetToken(s,token, i) == ")");
420 else if (command == "matrix")
422 GetXYPair(s, delta.a, delta.b,i);
423 GetXYPair(s, delta.c, delta.d,i);
424 GetXYPair(s, delta.e, delta.f,i);
425 assert(GetToken(s,token, i) == ")");
427 else if (command == "scale")
429 delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
430 GetToken(s, token, i);
433 delta.d = (strtod(GetToken(s,token,i).c_str(), NULL));
434 assert(GetToken(s, token, i) == ")");
439 assert(token == ")");
445 Warn("Unrecognised transform \"%s\", using identity", command.c_str());
448 //Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
449 //Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
451 SVGMatrix old(transform);
452 transform.a = old.a * delta.a + old.c * delta.b;
453 transform.c = old.a * delta.c + old.c * delta.d;
454 transform.e = old.a * delta.e + old.c * delta.f + old.e;
456 transform.b = old.b * delta.a + old.d * delta.b;
457 transform.d = old.b * delta.c + old.d * delta.d;
458 transform.f = old.b * delta.e + old.d * delta.f + old.f;
460 //Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
464 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
466 //Debug("Parse node <%s>", root.name());
469 for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
471 SVGMatrix transform(parent_transform);
472 pugi::xml_attribute attrib_trans = child.attribute("transform");
473 if (!attrib_trans.empty())
475 ParseSVGTransform(attrib_trans.as_string(), transform);
478 if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
479 || strcmp(child.name(), "group") == 0)
482 ParseSVGNode(child, transform);
485 else if (strcmp(child.name(), "path") == 0)
487 string d = child.attribute("d").as_string();
488 Debug("Path data attribute is \"%s\"", d.c_str());
489 pair<unsigned, unsigned> range = ParseSVGPathData(d, transform);
490 AddGroup(range.first, range.second);
493 else if (strcmp(child.name(), "line") == 0)
495 Real x0(child.attribute("x1").as_float());
496 Real y0(child.attribute("y1").as_float());
497 Real x1(child.attribute("x2").as_float());
498 Real y1(child.attribute("y2").as_float());
499 TransformXYPair(x0,y0,transform);
500 TransformXYPair(x1,y1,transform);
501 AddBezier(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
503 else if (strcmp(child.name(), "rect") == 0)
506 const char * attrib_names[] = {"x", "y", "width", "height"};
507 for (size_t i = 0; i < 4; ++i)
508 coords[i] = child.attribute(attrib_names[i]).as_float();
510 Real x2(coords[0]+coords[2]);
511 Real y2(coords[1]+coords[3]);
512 TransformXYPair(coords[0],coords[1],transform); // x, y, transform
513 TransformXYPair(x2,y2,transform);
514 coords[2] = x2 - coords[0];
515 coords[3] = y2 - coords[1];
517 bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
518 Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
520 else if (strcmp(child.name(), "circle") == 0)
522 Real cx = child.attribute("cx").as_float();
523 Real cy = child.attribute("cy").as_float();
524 Real r = child.attribute("r").as_float();
528 TransformXYPair(x,y,transform);
529 Real w = Real(2)*r*transform.a; // width scales
530 Real h = Real(2)*r*transform.d; // height scales
534 Add(CIRCLE_FILLED, rect,0);
535 Debug("Added Circle %s", rect.Str().c_str());
537 else if (strcmp(child.name(), "text") == 0)
539 Real x = child.attribute("x").as_float();
540 Real y = child.attribute("y").as_float();
541 TransformXYPair(x,y,transform);
542 Debug("Add text \"%s\"", child.child_value());
543 AddText(child.child_value(), 0.05, x, y);
549 * Load an SVG into a rectangle
551 void Document::LoadSVG(const string & filename, const Rect & bounds)
553 using namespace pugi;
555 xml_document doc_xml;
556 ifstream input(filename.c_str(), ios_base::in);
557 xml_parse_result result = doc_xml.load(input);
560 Fatal("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
562 Debug("Loaded XML - %s", result.description());
566 SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
567 ParseSVGNode(doc_xml, transform);
572 // Fear the wrath of the tokenizing svg data
573 // Seriously this isn't really very DOM-like at all is it?
574 pair<unsigned, unsigned> Document::ParseSVGPathData(const string & d, const SVGMatrix & transform)
576 Real x[4] = {0,0,0,0};
577 Real y[4] = {0,0,0,0};
591 static string delims("()[],{}<>;:=LlHhVvmMqQzZcC");
593 pair<unsigned, unsigned> range(m_count, m_count);
595 while (i < d.size() && GetToken(d, token, i, delims).size() > 0)
597 if (isalpha(token[0]))
606 bool relative = islower(command[0]);
608 if (command == "m" || command == "M")
610 //Debug("Construct moveto command");
611 Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
612 assert(GetToken(d,token,i,delims) == ",");
613 Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
615 x[0] = (relative) ? x[0] + dx : dx;
616 y[0] = (relative) ? y[0] + dy : dy;
618 //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
619 command = (command == "m") ? "l" : "L";
621 else if (command == "c" || command == "C" || command == "q" || command == "Q")
623 //Debug("Construct curveto command");
624 Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
625 assert(GetToken(d,token,i,delims) == ",");
626 Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
628 x[1] = (relative) ? x[0] + dx : dx;
629 y[1] = (relative) ? y[0] + dy : dy;
631 dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
632 assert(GetToken(d,token,i,delims) == ",");
633 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
635 x[2] = (relative) ? x[0] + dx : dx;
636 y[2] = (relative) ? y[0] + dy : dy;
638 if (command != "q" && command != "Q")
640 dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
641 assert(GetToken(d,token,i,delims) == ",");
642 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
643 x[3] = (relative) ? x[0] + dx : dx;
644 y[3] = (relative) ? y[0] + dy : dy;
650 Real old_x1(x[1]), old_y1(y[1]);
651 x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
652 y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
653 x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
654 y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
659 for (int j = 0; j < 4; ++j)
660 TransformXYPair(x[j],y[j], transform);
662 range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
664 //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]));
671 else if (command == "l" || command == "L" || command == "h" || command == "H" || command == "v" || command == "V")
673 Debug("Construct lineto command, relative %d", relative);
675 Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
677 if (command == "l" || command == "L")
679 assert(GetToken(d,token,i,delims) == ",");
680 dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
682 else if (command == "v" || command == "V")
687 x[1] = (relative) ? x[0] + dx : dx;
688 y[1] = (relative) ? y[0] + dy : dy;
689 if (command == "v" || command == "V")
693 else if (command == "h" || command == "H")
701 TransformXYPair(x[0],y[0],transform);
702 TransformXYPair(x[1],y[1],transform);
705 range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
707 //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
713 else if (command == "z" || command == "Z")
715 //Debug("Construct returnto command");
725 for (int j = 0; j < 4; ++j)
726 TransformXYPair(x[j],y[j], transform);
728 range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
729 //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
737 Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
752 void Document::SetFont(const string & font_filename)
754 if (m_font_data != NULL)
759 FILE *font_file = fopen("DejaVuSansMono.ttf", "rb");
760 fseek(font_file, 0, SEEK_END);
761 size_t font_file_size = ftell(font_file);
762 fseek(font_file, 0, SEEK_SET);
763 m_font_data = (unsigned char*)malloc(font_file_size);
764 size_t read = fread(m_font_data, 1, font_file_size, font_file);
765 if (read != font_file_size)
767 Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
770 stbtt_InitFont(&m_font, m_font_data, 0);
773 void Document::AddText(const string & text, Real scale, Real x, Real y)
775 if (m_font_data == NULL)
777 Warn("No font loaded");
781 float font_scale = stbtt_ScaleForPixelHeight(&m_font, scale);
784 int ascent = 0, descent = 0, line_gap = 0;
785 stbtt_GetFontVMetrics(&m_font, &ascent, &descent, &line_gap);
786 Real y_advance = Real(font_scale) * Real(ascent - descent + line_gap);
787 for (unsigned i = 0; i < text.size(); ++i)
794 if (!isprint(text[i]))
797 int advance_width = 0, left_side_bearing = 0, kerning = 0;
798 stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
801 kerning = stbtt_GetCodepointKernAdvance(&m_font, text[i-1], text[i]);
803 x += Real(font_scale) * Real(left_side_bearing + kerning);
804 AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
805 x += Real(font_scale) * Real(advance_width);
809 void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
811 int glyph_index = stbtt_FindGlyphIndex(font, character);
813 // Check if there is actully a glyph to render.
814 if (stbtt_IsGlyphEmpty(font, glyph_index))
819 stbtt_vertex *instructions;
820 int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
822 Real current_x(0), current_y(0);
823 unsigned start_index = m_count;
824 unsigned end_index = m_count;
825 for (int i = 0; i < num_instructions; ++i)
827 // TTF uses 16-bit signed ints for coordinates:
828 // with the y-axis inverted compared to us.
829 // Convert and scale any data.
830 Real inst_x = Real(instructions[i].x)*scale;
831 Real inst_y = Real(instructions[i].y)*-scale;
832 Real inst_cx = Real(instructions[i].cx)*scale;
833 Real inst_cy = Real(instructions[i].cy)*-scale;
834 Real old_x(current_x), old_y(current_y);
838 switch(instructions[i].type)
845 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));
847 // Quadratic Bezier To:
849 // Quadratic -> Cubic:
850 // - Endpoints are the same.
851 // - cubic1 = quad0+(2/3)*(quad1-quad0)
852 // - cubic2 = quad2+(2/3)*(quad1-quad2)
853 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,
854 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));
859 if (start_index < m_count && end_index < m_count)
861 AddGroup(start_index, end_index);
864 stbtt_FreeShape(font, instructions);