X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=blobdiff_plain;f=src%2Fdocument.cpp;h=24746dc137ea3cc57c196a3205b65c111e7bb0ce;hp=76a534903b05accbd92df9f4f3adcbcea6c1a72b;hb=6dd539966821debd18e0b86ed126742cd81d7fc9;hpb=2db1211c9a24a0cd22da1d3ddcddf564f814fc0a

diff --git a/src/document.cpp b/src/document.cpp
index 76a5349..24746dc 100644
--- a/src/document.cpp
+++ b/src/document.cpp
@@ -1,6 +1,11 @@
 #include "document.h"
 #include "bezier.h"
 #include <cstdio>
+#include <fstream>
+
+#include "../contrib/pugixml-1.4/src/pugixml.cpp"
+
+#include "stb_truetype.h"
 
 using namespace IPDF;
 using namespace std;
@@ -91,6 +96,118 @@ void Document::GenBaseQuadtree()
 {
 	m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QTC_UNKNOWN, 0, ObjectCount()});
 	m_quadtree.root_id = 0;
+	GenQuadChild(0, QTC_TOP_LEFT);
+}
+
+int Document::ClipObjectToQuadChild(int object_id, QuadTreeNodeChildren type)
+{
+	switch (m_objects.types[object_id])
+	{
+	case RECT_FILLED:
+	case RECT_OUTLINE:
+		{
+		Rect obj_bounds = TransformToQuadChild(m_objects.bounds[object_id], type);
+		if (obj_bounds.x < 0)
+		{
+			obj_bounds.w += obj_bounds.x;
+			obj_bounds.x = 0;
+		}
+		if (obj_bounds.y < 0)
+		{
+			obj_bounds.h += obj_bounds.y;
+			obj_bounds.y = 0;
+		}
+		if (obj_bounds.x + obj_bounds.w > 1)
+		{
+			obj_bounds.w += (1 - (obj_bounds.x + obj_bounds.w));
+		}
+		if (obj_bounds.y + obj_bounds.h > 1)
+		{
+			obj_bounds.h += (1 - (obj_bounds.y + obj_bounds.h));
+		}
+		m_objects.bounds.push_back(obj_bounds);
+		m_objects.types.push_back(m_objects.types[object_id]);
+		m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
+		return 1;
+		}
+	case GROUP:
+		break;
+	default:
+		Debug("Adding %s -> %s", m_objects.bounds[object_id].Str().c_str(), TransformToQuadChild(m_objects.bounds[object_id], type).Str().c_str());
+		m_objects.bounds.push_back(TransformToQuadChild(m_objects.bounds[object_id], type));
+		m_objects.types.push_back(m_objects.types[object_id]);
+		m_objects.data_indices.push_back(m_objects.data_indices[object_id]);
+		return 1;
+	}
+	return 0;
+}
+QuadTreeIndex Document::GenQuadChild(QuadTreeIndex parent, QuadTreeNodeChildren type)
+{
+	QuadTreeIndex new_index = m_quadtree.nodes.size();
+	m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, parent, type, 0, 0});
+
+	m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
+	for (unsigned i = m_quadtree.nodes[parent].object_begin; i < m_quadtree.nodes[parent].object_end; ++i)
+	{
+		if (IntersectsQuadChild(m_objects.bounds[i], type))
+		{
+			m_count += ClipObjectToQuadChild(i, type);
+		}
+	}
+	m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
+	switch (type)
+	{
+		case QTC_TOP_LEFT:
+			m_quadtree.nodes[parent].top_left = new_index;
+			break;
+		case QTC_TOP_RIGHT:
+			m_quadtree.nodes[parent].top_right = new_index;
+			break;
+		case QTC_BOTTOM_LEFT:
+			m_quadtree.nodes[parent].bottom_left = new_index;
+			break;
+		case QTC_BOTTOM_RIGHT:
+			m_quadtree.nodes[parent].bottom_right = new_index;
+			break;
+		default:
+			Fatal("Tried to add a QuadTree child of invalid type!");
+	}
+	return new_index;
+}
+
+// Reparent a quadtree node, making it the "type" child of a new node.
+QuadTreeIndex Document::GenQuadParent(QuadTreeIndex child, QuadTreeNodeChildren type)
+{
+	QuadTreeIndex new_index = m_quadtree.nodes.size();
+	m_quadtree.nodes.push_back(QuadTreeNode{QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, QUADTREE_EMPTY, -1, QTC_UNKNOWN, 0, 0});
+
+	m_quadtree.nodes[new_index].object_begin = m_objects.bounds.size();
+	for (unsigned i = m_quadtree.nodes[child].object_begin; i < m_quadtree.nodes[child].object_end; ++i)
+	{
+		m_objects.bounds.push_back(TransformFromQuadChild(m_objects.bounds[i], type));
+		m_objects.types.push_back(m_objects.types[i]);
+		m_objects.data_indices.push_back(m_objects.data_indices[i]);
+		m_count++;
+	}
+	m_quadtree.nodes[new_index].object_end = m_objects.bounds.size();
+	switch (type)
+	{
+		case QTC_TOP_LEFT:
+			m_quadtree.nodes[new_index].top_left = child;
+			break;
+		case QTC_TOP_RIGHT:
+			m_quadtree.nodes[new_index].top_right = child;
+			break;
+		case QTC_BOTTOM_LEFT:
+			m_quadtree.nodes[new_index].bottom_left = child;
+			break;
+		case QTC_BOTTOM_RIGHT:
+			m_quadtree.nodes[new_index].bottom_right = child;
+			break;
+		default:
+			Fatal("Tried to add a QuadTree child of invalid type!");
+	}
+	return new_index;
 }
 
 #endif
@@ -139,6 +256,11 @@ void Document::Load(const string & filename)
 			Debug("Bezier data...");
 			LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
 			break;
+			
+		case CT_OBJGROUPS:
+			Debug("Group data...");
+			Warn("Not handled because lazy");
+			break;
 		}
 	}
 	Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
@@ -150,12 +272,51 @@ void Document::Load(const string & filename)
 #endif
 }
 
-void Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
+unsigned Document::AddGroup(unsigned start_index, unsigned end_index)
+{
+	Real xmin = 0; Real ymin = 0; 
+	Real xmax = 0; Real ymax = 0;
+	
+	for (unsigned i = start_index; i <= end_index; ++i)
+	{
+		Rect & objb = m_objects.bounds[i];
+		
+		if (i == start_index || objb.x < xmin)
+			xmin = objb.x;
+		if (i == start_index || (objb.x+objb.w) > xmax)
+			xmax = (objb.x+objb.w);
+			
+		if (i == start_index || objb.y < ymin)
+			ymin = objb.y;
+		if (i == start_index || (objb.y+objb.h) > ymax)
+			ymax = (objb.y+objb.h);
+	}
+	
+	Rect bounds(xmin,ymin, xmax-xmin, ymax-ymin);
+	unsigned result = Add(GROUP, bounds,0);
+	m_objects.groups[m_count-1].first = start_index;
+	m_objects.groups[m_count-1].second = end_index;
+	return result;
+}
+
+/**
+ * Add a Bezier using Absolute coords
+ */
+unsigned Document::AddBezier(const Bezier & bezier)
+{
+	Rect bounds = bezier.SolveBounds();
+	Bezier data = bezier.ToRelative(bounds); // Relative
+	unsigned index = AddBezierData(data);
+	return Add(BEZIER, bounds, index);
+}
+
+unsigned Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 {
 	m_objects.types.push_back(type);
 	m_objects.bounds.push_back(bounds);
 	m_objects.data_indices.push_back(data_index);
-	++m_count; // Why can't we just use the size of types or something?
+	m_objects.groups.push_back(pair<unsigned, unsigned>(data_index, data_index));
+	return (m_count++); // Why can't we just use the size of types or something?
 }
 
 unsigned Document::AddBezierData(const Bezier & bezier)
@@ -181,3 +342,526 @@ bool Document::operator==(const Document & equ) const
 		&& memcmp(m_objects.data_indices.data(), equ.m_objects.data_indices.data(), ObjectCount() * sizeof(unsigned)) == 0
 		&& memcmp(m_objects.beziers.data(), equ.m_objects.beziers.data(), m_objects.beziers.size() * sizeof(Bezier)) == 0);
 }
+
+
+
+// Behold my amazing tokenizing abilities
+static string & GetToken(const string & d, string & token, unsigned & i, const string & delims = "()[],{}<>;:=")
+{
+	token.clear();
+	while (i < d.size() && iswspace(d[i]))
+	{
+		++i;
+	}
+	
+	while (i < d.size())
+	{
+		if (iswspace(d[i]) || strchr(delims.c_str(),d[i]) != NULL)
+		{
+			if (token.size() == 0 && !iswspace(d[i]))
+			{
+				token += d[i++];
+			}
+			break;	
+		}
+		token += d[i++];
+	}
+	//Debug("Got token \"%s\"", token.c_str());
+	return token;
+}
+
+static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
+{
+	string token("");
+	while (GetToken(d, token, i, delims) == ",");
+	x = strtod(token.c_str(),NULL);
+	if (GetToken(d, token, i, delims) != ",")
+	{
+		Fatal("Expected \",\" seperating x,y pair");
+	}
+	y = strtod(GetToken(d, token, i, delims).c_str(),NULL);
+}
+
+static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
+{
+	Real x0(x);
+	x = transform.a * x + transform.c * y + transform.e;
+	y = transform.b * x0 + transform.d * y + transform.f;
+}
+
+void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
+{
+	//Debug("Parsing transform %s", s.c_str());
+	string token;
+	string command;
+	unsigned i = 0;
+	
+	while (i < s.size())
+	{
+		GetToken(s, command, i);
+		if (command == "," || command == "" || command == ":")
+		{
+			if (i < s.size())
+				GetToken(s, command, i);
+			else
+				return;
+		}
+		//Debug("Token is \"%s\"", command.c_str());
+	
+		SVGMatrix delta = {1,0,0,0,1,0};
+	
+	
+		assert(GetToken(s,token, i) == "(");
+		if (command == "translate")
+		{
+			GetXYPair(s, delta.e, delta.f, i);
+			assert(GetToken(s,token, i) == ")");	
+		}
+		else if (command == "matrix")
+		{
+			GetXYPair(s, delta.a, delta.b,i);
+			GetXYPair(s, delta.c, delta.d,i);
+			GetXYPair(s, delta.e, delta.f,i);
+			assert(GetToken(s,token, i) == ")");	
+		}
+		else if (command == "scale")
+		{
+			delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
+			GetToken(s, token, i);
+			if (token == ",")
+			{
+				delta.d = (strtod(GetToken(s,token,i).c_str(), NULL));
+				assert(GetToken(s, token, i) == ")");
+			}
+			else
+			{
+				delta.d = delta.a;
+				assert(token == ")");
+			}
+			
+		}
+		else
+		{
+			Warn("Unrecognised transform \"%s\", using identity", command.c_str());
+		}
+	
+		//Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
+		//Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
+	
+		SVGMatrix old(transform);
+		transform.a = old.a * delta.a + old.c * delta.b;
+		transform.c = old.a * delta.c + old.c * delta.d;
+		transform.e = old.a * delta.e + old.c * delta.f + old.e;
+	
+		transform.b = old.b * delta.a + old.d * delta.b;
+		transform.d = old.b * delta.c + old.d * delta.d;
+		transform.f = old.b * delta.e + old.d * delta.f + old.f;
+	
+		//Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
+	}
+}
+
+void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
+{
+	//Debug("Parse node <%s>", root.name());
+
+		
+	for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
+	{
+		SVGMatrix transform(parent_transform);	
+		pugi::xml_attribute attrib_trans = child.attribute("transform");
+		if (!attrib_trans.empty())
+		{
+			ParseSVGTransform(attrib_trans.as_string(), transform);
+		}
+		
+		if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
+			|| strcmp(child.name(), "group") == 0)
+		{
+			
+			ParseSVGNode(child, transform);
+			continue;
+		}
+		else if (strcmp(child.name(), "path") == 0)
+		{
+			string d = child.attribute("d").as_string();
+			Debug("Path data attribute is \"%s\"", d.c_str());
+			pair<unsigned, unsigned> range = ParseSVGPathData(d, transform);
+			AddGroup(range.first, range.second);
+			
+		}
+		else if (strcmp(child.name(), "line") == 0)
+		{
+			Real x0(child.attribute("x1").as_float());
+			Real y0(child.attribute("y1").as_float());
+			Real x1(child.attribute("x2").as_float());
+			Real y1(child.attribute("y2").as_float());
+			TransformXYPair(x0,y0,transform);
+			TransformXYPair(x1,y1,transform);
+			AddBezier(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
+		}
+		else if (strcmp(child.name(), "rect") == 0)
+		{
+			Real coords[4];
+			const char * attrib_names[] = {"x", "y", "width", "height"};
+			for (size_t i = 0; i < 4; ++i)
+				coords[i] = child.attribute(attrib_names[i]).as_float();
+			
+			Real x2(coords[0]+coords[2]);
+			Real y2(coords[1]+coords[3]);
+			TransformXYPair(coords[0],coords[1],transform); // x, y, transform
+			TransformXYPair(x2,y2,transform);
+			coords[2] = x2 - coords[0];
+			coords[3] = y2 - coords[1];
+			
+			bool outline = !(child.attribute("fill") && strcmp(child.attribute("fill").as_string(),"none") != 0);
+			Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0], coords[1], coords[2], coords[3]),0);
+		}
+		else if (strcmp(child.name(), "circle") == 0)
+		{
+			Real cx = child.attribute("cx").as_float();
+			Real cy = child.attribute("cy").as_float();
+			Real r = child.attribute("r").as_float();
+			
+			Real x = (cx - r);
+			Real y = (cy - r);
+			TransformXYPair(x,y,transform);
+			Real w = Real(2)*r*transform.a; // width scales
+			Real h = Real(2)*r*transform.d; // height scales
+			
+			
+			Rect rect(x,y,w,h);
+			Add(CIRCLE_FILLED, rect,0);
+			Debug("Added Circle %s", rect.Str().c_str());			
+		}
+		else if (strcmp(child.name(), "text") == 0)
+		{
+			Real x = child.attribute("x").as_float();
+			Real y = child.attribute("y").as_float();
+			TransformXYPair(x,y,transform);
+			Debug("Add text \"%s\"", child.child_value());
+			AddText(child.child_value(), 0.05, x, y);
+		}
+	}
+}
+
+/**
+ * Load an SVG into a rectangle
+ */
+void Document::LoadSVG(const string & filename, const Rect & bounds)
+{
+	using namespace pugi;
+	
+	xml_document doc_xml;
+	ifstream input(filename.c_str(), ios_base::in);
+	xml_parse_result result = doc_xml.load(input);
+	
+	if (!result)
+		Fatal("Couldn't load \"%s\" - %s", filename.c_str(), result.description());
+		
+	Debug("Loaded XML - %s", result.description());
+	
+	input.close();
+						// a c e, b d f
+	SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
+	ParseSVGNode(doc_xml, transform);
+}
+
+
+
+// Fear the wrath of the tokenizing svg data
+// Seriously this isn't really very DOM-like at all is it?
+pair<unsigned, unsigned> Document::ParseSVGPathData(const string & d, const SVGMatrix & transform)
+{
+	Real x[4] = {0,0,0,0};
+	Real y[4] = {0,0,0,0};
+	
+	string token("");
+	string command("m");
+	
+	Real x0(0);
+	Real y0(0);
+	
+	unsigned i = 0;
+	unsigned prev_i = 0;
+	
+	bool start = false;
+	
+
+	static string delims("()[],{}<>;:=LlHhVvmMqQzZcC");
+
+	pair<unsigned, unsigned> range(m_count, m_count);
+	
+	while (i < d.size() && GetToken(d, token, i, delims).size() > 0)
+	{
+		if (isalpha(token[0]))
+			command = token;
+		else
+		{
+			i = prev_i; // hax
+			if(command == "")
+				command = "L";
+		}
+		
+		bool relative = islower(command[0]);
+			
+		if (command == "m" || command == "M")
+		{
+			//Debug("Construct moveto command");
+			Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
+			assert(GetToken(d,token,i,delims) == ",");
+			Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
+			
+			x[0] = (relative) ? x[0] + dx : dx;
+			y[0] = (relative) ? y[0] + dy : dy;
+			
+			x0 = x[0];
+			y0 = y[0];
+			//Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
+			command = (command == "m") ? "l" : "L";
+		}
+		else if (command == "c" || command == "C" || command == "q" || command == "Q")
+		{
+			//Debug("Construct curveto command");
+			Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
+			assert(GetToken(d,token,i,delims) == ",");
+			Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
+			
+			x[1] = (relative) ? x[0] + dx : dx;
+			y[1] = (relative) ? y[0] + dy : dy;
+			
+			dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
+			assert(GetToken(d,token,i,delims) == ",");
+			dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
+			
+			x[2] = (relative) ? x[0] + dx : dx;
+			y[2] = (relative) ? y[0] + dy : dy;
+			
+			if (command != "q" && command != "Q")
+			{
+				dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
+				assert(GetToken(d,token,i,delims) == ",");
+				dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
+				x[3] = (relative) ? x[0] + dx : dx;
+				y[3] = (relative) ? y[0] + dy : dy;
+			}
+			else
+			{
+				x[3] = x[2];
+				y[3] = y[2];
+				Real old_x1(x[1]), old_y1(y[1]);
+				x[1] = x[0] + Real(2) * (old_x1 - x[0])/ Real(3);
+				y[1] = y[0] + Real(2) * (old_y1 - y[0])/ Real(3);
+				x[2] = x[3] + Real(2) * (old_x1 - x[3])/ Real(3);
+				y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
+			}
+			
+			Real x3(x[3]);
+			Real y3(y[3]);
+			for (int j = 0; j < 4; ++j)
+				TransformXYPair(x[j],y[j], transform);
+
+			range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
+			
+			//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]));
+			
+			x[0] = x3;
+			y[0] = y3;
+
+			
+		}
+		else if (command == "l" || command == "L" || command == "h" || command == "H" || command == "v" || command == "V")
+		{
+			Debug("Construct lineto command, relative %d", relative);
+		
+			Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
+			Real dy;
+			if (command == "l" || command == "L")
+			{
+				assert(GetToken(d,token,i,delims) == ",");
+				dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
+			}
+			else if (command == "v" || command == "V")
+			{
+				swap(dx,dy);
+			}
+			
+			x[1] = (relative) ? x[0] + dx : dx;
+			y[1] = (relative) ? y[0] + dy : dy;
+			if (command == "v" || command == "V")
+			{
+				x[1] = x[0];
+			}
+			else if (command == "h" || command == "H")
+			{
+				y[1] = y[0];
+			}
+			
+			Real x1(x[1]);
+			Real y1(y[1]);
+			
+			TransformXYPair(x[0],y[0],transform);
+			TransformXYPair(x[1],y[1],transform);
+
+
+			range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
+			
+			//Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
+			
+			x[0] = x1;
+			y[0] = y1;
+
+		}
+		else if (command == "z" || command == "Z")
+		{
+			//Debug("Construct returnto command");
+			x[1] = x0;
+			y[1] = y0;
+			x[2] = x0;
+			y[2] = y0;
+			x[3] = x0;
+			y[3] = y0;
+			
+			Real x3(x[3]);
+			Real y3(y[3]);
+			for (int j = 0; j < 4; ++j)
+				TransformXYPair(x[j],y[j], transform);
+
+			range.second = AddBezier(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
+			//Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
+			
+			x[0] = x3;
+			y[0] = y3;
+			command = "m";
+		}
+		else
+		{
+			Warn("Unrecognised command \"%s\", set to \"m\"", command.c_str());
+			command = "m";
+		}
+		
+		if (!start)
+		{
+			x0 = x[0];
+			y0 = y[0];
+			start = true;
+		}
+		prev_i = i;
+	}
+	return range;
+}
+
+void Document::SetFont(const string & font_filename)
+{
+	if (m_font_data != NULL)
+	{
+		free(m_font_data);
+	}
+	
+	FILE *font_file = fopen("DejaVuSansMono.ttf", "rb");
+	fseek(font_file, 0, SEEK_END);
+	size_t font_file_size = ftell(font_file);
+	fseek(font_file, 0, SEEK_SET);
+	m_font_data = (unsigned char*)malloc(font_file_size);
+	size_t read = fread(m_font_data, 1, font_file_size, font_file);
+	if (read != font_file_size)
+	{
+		Fatal("Failed to read font data from \"%s\" - Read %u bytes expected %u - %s", font_filename.c_str(), read, font_file_size, strerror(errno));
+	}
+	fclose(font_file);
+	stbtt_InitFont(&m_font, m_font_data, 0);
+}
+
+void Document::AddText(const string & text, Real scale, Real x, Real y)
+{
+	if (m_font_data == NULL)
+	{
+		Warn("No font loaded");
+		return;
+	}
+		
+	float font_scale = stbtt_ScaleForPixelHeight(&m_font, scale);
+	Real x0(x);
+	//Real y0(y);
+	int ascent = 0, descent = 0, line_gap = 0;
+	stbtt_GetFontVMetrics(&m_font, &ascent, &descent, &line_gap);
+	Real y_advance = Real(font_scale) * Real(ascent - descent + line_gap);
+	for (unsigned i = 0; i < text.size(); ++i)
+	{
+		if (text[i] == '\n')
+		{
+			y += y_advance;
+			x = x0;
+		}
+		if (!isprint(text[i]))
+			continue;
+			
+		int advance_width = 0, left_side_bearing = 0, kerning = 0;
+		stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
+		if (i > 1)
+		{
+			kerning = stbtt_GetCodepointKernAdvance(&m_font, text[i-1], text[i]);
+		}
+		x += Real(font_scale) * Real(left_side_bearing + kerning);
+		AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
+		x += Real(font_scale) * Real(advance_width);
+	}
+}
+
+void Document::AddFontGlyphAtPoint(stbtt_fontinfo *font, int character, Real scale, Real x, Real y)
+{
+	int glyph_index = stbtt_FindGlyphIndex(font, character);
+
+	// Check if there is actully a glyph to render.
+	if (stbtt_IsGlyphEmpty(font, glyph_index))
+	{
+		return;
+	}
+
+	stbtt_vertex *instructions;
+	int num_instructions = stbtt_GetGlyphShape(font, glyph_index, &instructions);
+
+	Real current_x(0), current_y(0);
+	unsigned start_index = m_count;
+	unsigned end_index = m_count;
+	for (int i = 0; i < num_instructions; ++i)
+	{
+		// TTF uses 16-bit signed ints for coordinates:
+		// with the y-axis inverted compared to us.
+		// Convert and scale any data.
+		Real inst_x = Real(instructions[i].x)*scale;
+		Real inst_y = Real(instructions[i].y)*-scale;
+		Real inst_cx = Real(instructions[i].cx)*scale;
+		Real inst_cy = Real(instructions[i].cy)*-scale;
+		Real old_x(current_x), old_y(current_y);
+		current_x = inst_x;
+		current_y = inst_y;
+		
+		switch(instructions[i].type)
+		{
+		// Move To
+		case STBTT_vmove:
+			break;
+		// Line To
+		case STBTT_vline:
+			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));
+			break;
+		// Quadratic Bezier To:
+		case STBTT_vcurve:
+			// Quadratic -> Cubic:
+			// - Endpoints are the same.
+			// - cubic1 = quad0+(2/3)*(quad1-quad0)
+			// - cubic2 = quad2+(2/3)*(quad1-quad2)
+			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,
+						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));
+			break;
+		}
+	}
+	
+	if (start_index < m_count && end_index < m_count)
+	{
+		AddGroup(start_index, end_index);
+	}
+
+	stbtt_FreeShape(font, instructions);
+}