337 lines
12 KiB
C++
337 lines
12 KiB
C++
//$$INSERT legal.txt
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#include "PreCompiled.h"
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#include <iostream>
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#include <fstream>
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#include <string>
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#include <sstream>
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#include <cstdio>
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#include <cstdlib>
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#include <stdexcept>
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#include <vector>
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#include <BRepBuilderAPI_MakeEdge.hxx>
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#include <BRepBuilderAPI_MakeWire.hxx>
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#include <Geom_BezierCurve.hxx>
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#include <gp_Pnt.hxx>
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#include <TopoDS_Edge.hxx>
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#include <TopoDS_Wire.hxx>
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#include <TColStd_Array1OfReal.hxx>
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#include <TColStd_Array1OfInteger.hxx>
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#include <TColgp_Array1OfPnt.hxx>
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#include "TopoShape.h"
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#include "TopoShapePy.h"
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#include "TopoShapeEdgePy.h"
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#include "TopoShapeWirePy.h"
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_OUTLINE_H
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#include FT_GLYPH_H
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#include FT_TYPES_H
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#include "FT2FC.h"
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using namespace Part;
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typedef unsigned long UNICHAR; // ul is FT2's codepoint type <=> Py_UNICODE2/4
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//typedef std::vector <std::vector <TopoShapeWirePy*> > FT2FCRET;
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typedef PyObject* FT2FCRET;
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// Private function prototypes
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//std::vector<TopoShapeWirePy*> getGlyphContours();
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PyObject* getGlyphContours(FT_Face FTFont, UNICHAR currchar, int PenPos, float Scale);
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FT_Vector getKerning(FT_Face FTFont, UNICHAR lc, UNICHAR rc);
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TopoShapeWirePy* edgesToWire(std::vector<TopoDS_Edge> Edges);
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// get string's wires (contours) in FC/OCC coords
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//FT2FCRET FT2FC(const Py_UNICODE *pustring,
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PyObject* FT2FC(const Py_UNICODE *pustring,
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const size_t length,
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const char *FontPath,
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const char *FontName,
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const float stringheight, // fc coords
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const int tracking) { // fc coords
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FT_Library FTLib;
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FT_Face FTFont;
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FT_Error error;
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FT_Long FaceIndex = 0; // some fonts have multiple faces
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FT_Vector kern;
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FT_UInt FTLoadFlags = FT_LOAD_DEFAULT | FT_LOAD_NO_BITMAP;
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std::string FontSpec;
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std::stringstream ErrorMsg;
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float scalefactor;
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UNICHAR prevchar = 0, currchar = 0;
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int cadv,PenPos = 0, PyErr;
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size_t i;
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// std::vector<TopoShapeWirePy*> CharWires;
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// FT2FCRET Ret;
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PyObject *WireList, *CharList;
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error = FT_Init_FreeType(&FTLib);
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if(error) {
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ErrorMsg << "FT_Init_FreeType failed: " << error;
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throw std::runtime_error(ErrorMsg.str());
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}
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std::string tmpPath = FontPath; // can't concat const char*
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std::string tmpName = FontName;
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FontSpec = tmpPath + tmpName;
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// FT does not return an error if font file not found?
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std::ifstream is;
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is.open (FontSpec.c_str());
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if (!is) {
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ErrorMsg << "Font file not found: " << FontSpec;
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throw std::runtime_error(ErrorMsg.str());
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}
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// maybe boost::filesystem::exists for x-platform??
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error = FT_New_Face(FTLib,FontSpec.c_str(),FaceIndex, &FTFont);
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if(error) {
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ErrorMsg << "FT_New_Face failed: " << error;
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throw std::runtime_error(ErrorMsg.str());
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}
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//TODO: check that FTFont is scalable? only relevant for hinting etc?
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// FT2 blows up if char size is not set to some non-zero value.
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// This sets size to 48 point. Magic.
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error = FT_Set_Char_Size(FTFont,
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0, /* char_width in 1/64th of points */
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48*64, /* char_height in 1/64th of points */
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0, /* horizontal device resolution */
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0 ); /* vertical device resolution */
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if(error) {
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ErrorMsg << "FT_Set_Char_Size failed: " << error;
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throw std::runtime_error(ErrorMsg.str());
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}
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scalefactor = float(stringheight/FTFont->height);
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CharList = PyList_New(0);
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for (i=0; i<length; i++) {
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currchar = pustring[i];
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error = FT_Load_Char(FTFont,
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currchar,
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FTLoadFlags);
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if(error) {
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ErrorMsg << "FT_Load_Char failed: " << error;
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throw std::runtime_error(ErrorMsg.str());
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}
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cadv = FTFont->glyph->advance.x;
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kern = getKerning(FTFont,prevchar,currchar);
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PenPos += kern.x;
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// CharWires = getGlyphContours(FTFont,currchar,PenPos, scalefactor);
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WireList = getGlyphContours(FTFont,currchar,PenPos, scalefactor);
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// if (CharWires.empty()) // whitespace char
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if (!PyList_Size(WireList)) // empty ==> whitespace
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std::cout << "char " << i << " = " << hex << std::showbase << currchar << " has no wires! " << std::endl;
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else
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// Ret.push_back(CharWires);
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PyErr = PyList_Append(CharList, WireList); //add error check
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// not entirely happy with tracking solution. It's specified in FC units,
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// so we have to convert back to font units to use it here. We could
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// lose some accuracy. Hard to put it into FT callbacks since tracking
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// only affects position of chars 2 - n. Don't want to loop 2x through wires.
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PenPos += cadv + int(tracking/scalefactor);
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prevchar = currchar;
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}
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error = FT_Done_FreeType(FTLib);
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if(error) {
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ErrorMsg << "FT_Done_FreeType failed: " << error;
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throw std::runtime_error(ErrorMsg.str());
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}
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return(CharList);
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}
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//********** FT Decompose callbacks and data defns
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// FT Decomp Context for 1 char
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struct FTDC_Ctx {
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// std::vector<TopoShapeWirePy*> TWires;
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PyObject* WireList;
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std::vector<TopoDS_Edge> Edges;
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UNICHAR currchar;
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int penpos;
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float scalefactor;
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FT_Vector LastVert;
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};
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// move_cb called for start of new contour. pt is xy of contour start.
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// p points to the context where we remember what happened previously (last point, etc)
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static int move_cb(const FT_Vector* pt, void* p) {
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FTDC_Ctx* dc = (FTDC_Ctx*) p;
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int PyErr;
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if (!dc->Edges.empty()){
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TopoShapeWirePy* newwire;
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newwire = edgesToWire(dc->Edges);
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// dc->TWires.push_back(newwire);
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PyErr = PyList_Append(dc->WireList, newwire); // add error check
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dc->Edges.clear();
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}
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dc->LastVert.x = pt->x + dc->penpos;
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dc->LastVert.y = pt->y;
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return 0;
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}
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// line_cb called for line segment in the current contour: line(LastVert -- pt)
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static int line_cb(const FT_Vector* pt, void* p) {
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FTDC_Ctx* dc = (FTDC_Ctx*) p;
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// convert font coords to FC/OCC coords
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float v1x = dc->scalefactor * dc->LastVert.x;
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float v1y = dc->scalefactor * dc->LastVert.y;
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float v2x = dc->scalefactor * (pt->x + dc->penpos);
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float v2y = dc->scalefactor * pt->y;
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gp_Pnt v1(v1x, v1y, 0);
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gp_Pnt v2(v2x, v2y, 0);
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BRepBuilderAPI_MakeEdge makeEdge(v1,v2);
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TopoDS_Edge edge = makeEdge.Edge();
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dc->Edges.push_back(edge);
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dc->LastVert.x = pt->x + dc->penpos;
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dc->LastVert.y = pt->y;
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return 0;
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}
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// quad_cb called for quadratic (conic) BCurve segment in the current contour
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// (ie V-C-V in TTF fonts). BCurve(LastVert -- pt0 -- pt1)
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static int quad_cb(const FT_Vector* pt0, const FT_Vector* pt1, void* p) {
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FTDC_Ctx* dc = (FTDC_Ctx*) p;
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TColgp_Array1OfPnt Poles(1,3);
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// convert font coords to FC/OCC coords
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float v1x = dc->scalefactor * dc->LastVert.x;
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float v1y = dc->scalefactor * dc->LastVert.y;
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float c1x = dc->scalefactor * (pt0->x + dc->penpos);
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float c1y = dc->scalefactor * pt0->y;
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float v2x = dc->scalefactor * (pt1->x + dc->penpos);
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float v2y = dc->scalefactor * pt1->y;
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gp_Pnt v1(v1x, v1y, 0);
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gp_Pnt c1(c1x, c1y, 0);
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gp_Pnt v2(v2x, v2y, 0);
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Poles.SetValue(1, v1);
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Poles.SetValue(2, c1);
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Poles.SetValue(3, v2);
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// "new" bcseg? need to free this, but don't know when. does makeedge need it forever? or just for creation?
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// how to delete a "handle"? memory leak?
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Handle(Geom_BezierCurve) bcseg = new Geom_BezierCurve(Poles);
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BRepBuilderAPI_MakeEdge makeEdge(bcseg, v1, v2);
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TopoDS_Edge edge = makeEdge.Edge();
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dc->Edges.push_back(edge);
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dc->LastVert.x = pt1->x + dc->penpos;
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dc->LastVert.y = pt1->y;
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return 0;
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}
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// cubic_cb called for cubic BCurve segment in the current contour (ie V-C-C-V in
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// Type 1 fonts). BCurve(LastVert -- pt0 -- pt1 -- pt2)
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static int cubic_cb(const FT_Vector* pt0, const FT_Vector* pt1, const FT_Vector* pt2, void* p) {
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FTDC_Ctx* dc = (FTDC_Ctx*) p;
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TColgp_Array1OfPnt Poles(1,4);
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// convert font coords to FC/OCC coords
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float v1x = dc->scalefactor * dc->LastVert.x;
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float v1y = dc->scalefactor * dc->LastVert.y;
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float c1x = dc->scalefactor * (pt0->x + dc->penpos);
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float c1y = dc->scalefactor * pt0->y;
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float c2x = dc->scalefactor * (pt1->x + dc->penpos);
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float c2y = dc->scalefactor * pt1->y;
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float v2x = dc->scalefactor * (pt2->x + dc->penpos);
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float v2y = dc->scalefactor * pt2->y;
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gp_Pnt v1(v1x, v1y, 0);
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gp_Pnt c1(c1x, c1y, 0);
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gp_Pnt c2(c2x, c2y, 0);
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gp_Pnt v2(v2x, v2y, 0);
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Poles.SetValue(1, v1);
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Poles.SetValue(2, c1);
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Poles.SetValue(3, c2);
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Poles.SetValue(4, v2);
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Handle(Geom_BezierCurve) bcseg = new Geom_BezierCurve(Poles); // new? need to free this?
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BRepBuilderAPI_MakeEdge makeEdge(bcseg, v1, v2);
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TopoDS_Edge edge = makeEdge.Edge();
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dc->Edges.push_back(edge);
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dc->LastVert.x = pt2->x + dc->penpos;
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dc->LastVert.y = pt2->y;
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return 0;
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}
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// FT Callbacks structure
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static FT_Outline_Funcs FTcbFuncs = {
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(FT_Outline_MoveToFunc)move_cb,
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(FT_Outline_LineToFunc)line_cb,
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(FT_Outline_ConicToFunc)quad_cb,
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(FT_Outline_CubicToFunc)cubic_cb,
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0, 0 // not needed for FC
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};
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//
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//********** FT2FC Helpers
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// get glyph outline in wires
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//std::vector<TopoShapeWirePy*> getGlyphContours(FT_Face FTFont, UNICHAR currchar, int PenPos, float Scale) {
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PyObject* getGlyphContours(FT_Face FTFont, UNICHAR currchar, int PenPos, float Scale) {
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FT_Error error = 0;
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std::stringstream ErrorMsg;
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FTDC_Ctx ctx;
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int PyErr;
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ctx.currchar = currchar;
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ctx.penpos = PenPos;
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ctx.scalefactor = Scale;
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ctx.WireList = PyList_New(0);
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error = FT_Outline_Decompose(&FTFont->glyph->outline,
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&FTcbFuncs,
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&ctx);
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if(error) {
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ErrorMsg << "FT_Decompose failed: " << error;
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throw std::runtime_error(ErrorMsg.str());
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}
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// make the last twire
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if (!ctx.Edges.empty()){
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// ctx.TWires.push_back(edgesToWire(ctx.Edges));
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PyErr = PyList_Append(ctx.WireList, edgesToWire(ctx.Edges)); // add error check
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}
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// return(ctx.TWires);
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return(ctx.WireList);
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}
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// get kerning values for this char pair
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//TODO: should check FT_HASKERNING flag?
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FT_Vector getKerning(FT_Face FTFont, UNICHAR lc, UNICHAR rc) {
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FT_Vector retXY;
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FT_Error error;
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std::stringstream ErrorMsg;
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FT_Vector ftKern;
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FT_UInt lcx = FT_Get_Char_Index(FTFont, lc);
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FT_UInt rcx = FT_Get_Char_Index(FTFont, rc);
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error = FT_Get_Kerning(FTFont,lcx,rcx,FT_KERNING_DEFAULT,&ftKern);
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if(error) {
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ErrorMsg << "FT_Get_Kerning failed: " << error;
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throw std::runtime_error(ErrorMsg.str());
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}
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retXY.x = ftKern.x;
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retXY.y = ftKern.y;
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return(retXY);
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}
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// Make a TopoDS_Wire from a list of TopoDS_Edges
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TopoShapeWirePy* edgesToWire(std::vector<TopoDS_Edge> Edges) {
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TopoDS_Wire occwire;
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std::vector<TopoDS_Edge>::iterator iEdge;
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// if Edges.empty() ????
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BRepBuilderAPI_MakeWire mkWire;
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for (iEdge = Edges.begin(); iEdge != Edges.end(); ++iEdge){
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mkWire.Add(*iEdge);
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}
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// if(mkWire.Done()) ???
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occwire = mkWire.Wire();
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TopoShapeWirePy* newwire = new TopoShapeWirePy(new TopoShape (occwire));
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return(newwire);
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}
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