Files
create/src/Mod/Part/App/FT2FC.cpp
2013-03-22 09:38:32 -04:00

337 lines
12 KiB
C++

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