X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=blobdiff_plain;f=src%2Fdocument.cpp;h=f23b4068960f7652474c728cb2ae13cae7234d8a;hp=d745c1548f9818461c15ff8bf75117670991f1c2;hb=4166b2c124b0bc652e9f8e5245488cdd2b86ebf0;hpb=0d33eac5144178de754ad9f53e39463f79a31398

diff --git a/src/document.cpp b/src/document.cpp
index d745c15..f23b406 100644
--- a/src/document.cpp
+++ b/src/document.cpp
@@ -1,10 +1,17 @@
 #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;
 
+//TODO: Make this work for variable sized Reals
+
 // Loads an std::vector<T> of size num_elements from a file.
 template<typename T>
 static void LoadStructVector(FILE *src_file, size_t num_elems, std::vector<T>& dest)
@@ -26,6 +33,26 @@ static void SaveStructVector(FILE *dst_file, std::vector<T>& src)
 		Fatal("Only wrote %u structs (expected %u)!", written, src.size());
 }
 
+static void WriteChunkHeader(FILE *dst_file, DocChunkTypes type, uint32_t size)
+{
+	size_t written = 0;
+	written = fwrite(&type, sizeof(type), 1, dst_file);
+	if (written != 1)
+		Fatal("Could not write Chunk header! (ID)");
+	written = fwrite(&size, sizeof(size), 1, dst_file);
+	if (written != 1)
+		Fatal("Could not write Chunk header (size)!");
+}
+
+static bool ReadChunkHeader(FILE *src_file, DocChunkTypes& type, uint32_t& size)
+{
+	if (fread(&type, sizeof(DocChunkTypes), 1, src_file) != 1)
+		return false;
+	if (fread(&size, sizeof(uint32_t), 1, src_file) != 1)
+		return false;
+	return true;
+}
+
 void Document::Save(const string & filename)
 {
 	Debug("Saving document to file \"%s\"...", filename.c_str());
@@ -35,16 +62,27 @@ void Document::Save(const string & filename)
 
 	size_t written;
 	Debug("Number of objects (%u)...", ObjectCount());
+	WriteChunkHeader(file, CT_NUMOBJS, sizeof(m_count));
 	written = fwrite(&m_count, sizeof(m_count), 1, file);
 	if (written != 1)
 		Fatal("Failed to write number of objects!");
 
 	Debug("Object types...");
+	WriteChunkHeader(file, CT_OBJTYPES, m_objects.types.size() * sizeof(ObjectType));
 	SaveStructVector<ObjectType>(file, m_objects.types);
 
 	Debug("Object bounds...");
+	WriteChunkHeader(file, CT_OBJBOUNDS, m_objects.bounds.size() * sizeof(Rect));
 	SaveStructVector<Rect>(file, m_objects.bounds);
 
+	Debug("Object data indices...");
+	WriteChunkHeader(file, CT_OBJINDICES, m_objects.data_indices.size() * sizeof(unsigned));
+	SaveStructVector<unsigned>(file, m_objects.data_indices);
+	
+	Debug("Bezier data...");
+	WriteChunkHeader(file, CT_OBJBEZIERS, m_objects.beziers.size() * sizeof(uint8_t));
+	SaveStructVector<Bezier>(file, m_objects.beziers);
+
 	int err = fclose(file);
 	if (err != 0)
 		Fatal("Failed to close file \"%s\" - %s", filename.c_str(), strerror(err));
@@ -52,6 +90,90 @@ void Document::Save(const string & filename)
 	Debug("Successfully saved %u objects to \"%s\"", ObjectCount(), filename.c_str());
 }
 
+#ifndef QUADTREE_DISABLED
+
+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);
+	GenQuadParent(0, QTC_BOTTOM_RIGHT);
+}
+
+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 (ContainedInQuadChild(m_objects.bounds[i], type))
+		{
+			m_objects.bounds.push_back(TransformToQuadChild(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[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
+
 void Document::Load(const string & filename)
 {
 	m_objects.bounds.clear();
@@ -67,27 +189,61 @@ void Document::Load(const string & filename)
 		Fatal("Couldn't open file \"%s\"", filename.c_str(), strerror(errno));
 
 	size_t read;
-	read = fread(&m_count, sizeof(m_count), 1, file);
-	if (read != 1)
-		Fatal("Failed to read number of objects!");
-	Debug("Number of objects: %u", ObjectCount());
 
-	Debug("Object types...");
-	LoadStructVector<ObjectType>(file, ObjectCount(), m_objects.types);
-	
-	Debug("Object bounds...");
-	LoadStructVector<Rect>(file, ObjectCount(), m_objects.bounds);
-	
+	DocChunkTypes chunk_type;
+	uint32_t chunk_size;
+	while (ReadChunkHeader(file, chunk_type, chunk_size))
+	{
+		switch(chunk_type)
+		{
+		case CT_NUMOBJS:
+			read = fread(&m_count, sizeof(m_count), 1, file);
+			if (read != 1)
+				Fatal("Failed to read number of objects!");
+			Debug("Number of objects: %u", ObjectCount());
+			break;
+		case CT_OBJTYPES:
+			Debug("Object types...");
+			LoadStructVector<ObjectType>(file, chunk_size/sizeof(ObjectType), m_objects.types);
+			break;
+		case CT_OBJBOUNDS:
+			Debug("Object bounds...");
+			LoadStructVector<Rect>(file, chunk_size/sizeof(Rect), m_objects.bounds);
+			break;
+		case CT_OBJINDICES:
+			Debug("Object data indices...");
+			LoadStructVector<unsigned>(file, chunk_size/sizeof(unsigned), m_objects.data_indices);
+			break;
+		case CT_OBJBEZIERS:
+			Debug("Bezier data...");
+			LoadStructVector<Bezier>(file, chunk_size/sizeof(Bezier), m_objects.beziers);
+			break;
+		}
+	}
 	Debug("Successfully loaded %u objects from \"%s\"", ObjectCount(), filename.c_str());
+#ifndef QUADTREE_DISABLED
+	if (m_quadtree.root_id == QUADTREE_EMPTY)
+	{
+		GenBaseQuadtree();
+	}
+#endif
 }
 
-void Document::Add(ObjectType type, const Rect & bounds)
+void Document::Add(ObjectType type, const Rect & bounds, unsigned data_index)
 {
 	m_objects.types.push_back(type);
 	m_objects.bounds.push_back(bounds);
-	m_count++;
+	m_objects.data_indices.push_back(data_index);
+	++m_count; // Why can't we just use the size of types or something?
 }
 
+unsigned Document::AddBezierData(const Bezier & bezier)
+{
+	m_objects.beziers.push_back(bezier);
+	return m_objects.beziers.size()-1;
+}
+
+
 void Document::DebugDumpObjects()
 {
 	Debug("Objects for Document %p are:", this);
@@ -99,5 +255,385 @@ void Document::DebugDumpObjects()
 
 bool Document::operator==(const Document & equ) const
 {
-	return (ObjectCount() == equ.ObjectCount() && memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0);
+	return (ObjectCount() == equ.ObjectCount() 
+		&& memcmp(m_objects.bounds.data(), equ.m_objects.bounds.data(), ObjectCount() * sizeof(Rect)) == 0
+		&& 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);
+}
+
+
+
+
+void Document::ParseSVGNode(pugi::xml_node & root, const Rect & bounds, Real & width, Real & height)
+{
+	Debug("Parse node <%s>", root.name());
+	pugi::xml_attribute attrib_w = root.attribute("width");
+	pugi::xml_attribute attrib_h = root.attribute("height");
+	if (!attrib_w.empty())
+		width = attrib_w.as_float() * bounds.w;
+	if (!attrib_h.empty())
+		height = attrib_h.as_float() * bounds.h;
+			
+	for (pugi::xml_node child = root.first_child(); child; child = child.next_sibling())
+	{
+
+		
+		if (strcmp(child.name(), "svg") == 0 || strcmp(child.name(),"g") == 0
+			|| strcmp(child.name(), "group") == 0)
+		{
+			//TODO: Handle translates etc here
+			ParseSVGNode(child, bounds, width, height);
+			continue;
+		}
+		else if (strcmp(child.name(), "path") == 0)
+		{
+			string d = child.attribute("d").as_string();
+			Debug("Path data attribute is \"%s\"", d.c_str());
+			ParseSVGPathData(d, Rect(bounds.x,bounds.y,width,height));
+		}
+		else if (strcmp(child.name(), "line") == 0)
+		{
+			Real x0(child.attribute("x1").as_float()/width + bounds.x);
+			Real y0(child.attribute("y1").as_float()/height + bounds.y);
+			Real x1(child.attribute("x2").as_float()/width + bounds.x);
+			Real y1(child.attribute("y2").as_float()/height + bounds.y);
+			unsigned index = AddBezierData(Bezier(x0,y0,x1,y1,x1,y1,x1,y1));
+			Add(BEZIER, Rect(0,0,1,1), index);
+		}
+		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();
+			
+			bool outline = !(child.attribute("fill"));
+			Add(outline?RECT_OUTLINE:RECT_FILLED, Rect(coords[0]/width + bounds.x, coords[1]/height + bounds.y, coords[2]/width, coords[3]/height),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)/width + bounds.x; 
+			Real y = (cy - r)/height + bounds.y; 
+			Real w = Real(2)*r/width; 
+			Real h = Real(2)*r/height;
+			
+			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()/width + bounds.x;
+			Real y = child.attribute("y").as_float()/height + bounds.y;
+			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();
+	Real width(1);
+	Real height(1);
+	ParseSVGNode(doc_xml, bounds,width,height);
+}
+
+// Behold my amazing tokenizing abilities
+static string & GetToken(const string & d, string & token, unsigned & i)
+{
+	token.clear();
+	while (i < d.size() && iswspace(d[i]))
+	{
+		++i;
+	}
+	
+	while (i < d.size())
+	{
+		if (d[i] == ',' || (isalpha(d[i]) && d[i] != 'e') || iswspace(d[i]))
+		{
+			if (token.size() == 0 && !iswspace(d[i]))
+			{
+				token += d[i++];
+			}
+			break;	
+		}
+		token += d[i++];
+	}
+	//Debug("Got token \"%s\"", token.c_str());
+	return token;
+}
+
+
+// Fear the wrath of the tokenizing svg data
+// Seriously this isn't really very DOM-like at all is it?
+void Document::ParseSVGPathData(const string & d, const Rect & bounds)
+{
+	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;
+	
+	while (i < d.size() && GetToken(d, token, i).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).c_str(),NULL)) / bounds.w;
+			assert(GetToken(d,token,i) == ",");
+			Real dy = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.h;
+			
+			x[0] = (relative) ? x[0] + dx : dx;
+			y[0] = (relative) ? y[0] + dy : dy;
+			
+
+			
+			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).c_str(),NULL))/bounds.w;
+			assert(GetToken(d,token,i) == ",");
+			Real dy = Real(strtod(GetToken(d,token,i).c_str(),NULL))/bounds.h;
+			
+			x[1] = (relative) ? x[0] + dx : dx;
+			y[1] = (relative) ? y[0] + dy : dy;
+			
+			dx = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.w;
+			assert(GetToken(d,token,i) == ",");
+			dy = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.h;
+			
+			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).c_str(),NULL)) / bounds.w;
+				assert(GetToken(d,token,i) == ",");
+				dy = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.h;
+				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);
+			}
+			
+			unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
+			Add(BEZIER,Rect(0,0,1,1),index);
+			
+			
+			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] = x[3];
+			y[0] = y[3];
+
+			
+		}
+		else if (command == "l" || command == "L")
+		{
+			Debug("Construct lineto command");
+		
+			Real dx = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.w;
+			assert(GetToken(d,token,i) == ",");
+			Real dy = Real(strtod(GetToken(d,token,i).c_str(),NULL)) / bounds.h;
+			
+			x[1] = (relative) ? x[0] + dx : dx;
+			y[1] = (relative) ? y[0] + dy : dy;
+			
+			x[2] = x[1];
+			y[2] = y[1];
+			
+			x[3] = x[1];
+			y[3] = y[1];
+
+			unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
+			Add(BEZIER,Rect(0,0,1,1),index);
+			
+			Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
+			
+			x[0] = x[3];
+			y[0] = y[3];
+
+		}
+		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;
+			
+			unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
+			Add(BEZIER,Rect(0,0,1,1),index);
+			
+			Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
+			
+			x[0] = x[3];
+			y[0] = y[3];
+			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;
+	}
+}
+
+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);
+	for (unsigned i = 0; i < text.size(); ++i)
+	{
+		if (text[i] == '\n')
+		{
+			y += 0.5*scale;
+			x = x0;
+		}
+		if (!isprint(text[i]))
+			continue;
+			
+		AddFontGlyphAtPoint(&m_font, text[i], font_scale, x, y);
+		x += 0.5*scale;
+	}
+}
+
+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);
+
+	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;
+		unsigned bezier_index;
+		switch(instructions[i].type)
+		{
+		// Move To
+		case STBTT_vmove:
+			break;
+		// Line To
+		case STBTT_vline:
+			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));
+			Add(BEZIER,Rect(0,0,1,1),bezier_index);
+			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)
+			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,
+						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));
+			Add(BEZIER,Rect(0,0,1,1),bezier_index);
+			break;
+		}
+	}
+
+	stbtt_FreeShape(font, instructions);
 }