#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;
{
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
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());
#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)
&& 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;
+
+ //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);
+}
git.ucc.asn.au / ipdf / code.git / blobdiff
UCC git Repository :: git.ucc.asn.au