static FT_Vector GetMidPoint(FT_Vector v1, FT_Vector v2)
{
return(new FT_Vector(
(v1.x + v2.x) / 2,
(v1.y + v2.y) / 2));
}
unsafe internal static void BuildGlyphOutline(FontGlyph fontGlyph, ExportGlyph *exportTypeFace)
{
FT_Outline outline = (*(FT_Outline *)exportTypeFace->outline);
//outline version
//------------------------------
int npoints = outline.n_points;
List <PixelFarm.VectorMath.Vector2> points = new List <PixelFarm.VectorMath.Vector2>(npoints);
int startContour = 0;
int cpoint_index = 0;
int todoContourCount = outline.n_contours;
PixelFarm.Agg.VertexSource.PathWriter ps = new Agg.VertexSource.PathWriter();
fontGlyph.originalVxs = ps.Vxs;
const int resize = 64;
int controlPointCount = 0;
while (todoContourCount > 0)
{
int nextContour = outline.contours[startContour] + 1;
bool isFirstPoint = true;
FT_Vector secondControlPoint = new FT_Vector();
FT_Vector thirdControlPoint = new FT_Vector();
bool justFromCurveMode = false;
//FT_Vector vpoint = new FT_Vector();
for (; cpoint_index < nextContour; ++cpoint_index)
{
FT_Vector vpoint = outline.points[cpoint_index];
byte vtag = outline.tags[cpoint_index];
bool has_dropout = (((vtag >> 2) & 0x1) != 0);
int dropoutMode = vtag >> 3;
if ((vtag & 0x1) != 0)
{
//on curve
if (justFromCurveMode)
{
switch (controlPointCount)
{
case 1:
{
ps.Curve3(secondControlPoint.x / resize, secondControlPoint.y / resize,
vpoint.x / resize, vpoint.y / resize);
}
break;
case 2:
{
ps.Curve4(secondControlPoint.x / resize, secondControlPoint.y / resize,
thirdControlPoint.x / resize, thirdControlPoint.y / resize,
vpoint.x / resize, vpoint.y / resize);
}
break;
default:
{
throw new NotSupportedException();
}
}
controlPointCount = 0;
justFromCurveMode = false;
}
else
{
if (isFirstPoint)
{
isFirstPoint = false;
ps.MoveTo(vpoint.x / resize, vpoint.y / resize);
}
else
{
ps.LineTo(vpoint.x / resize, vpoint.y / resize);
}
if (has_dropout)
{
//printf("[%d] on,dropoutMode=%d: %d,y:%d \n", mm, dropoutMode, vpoint.x, vpoint.y);
}
else
{
//printf("[%d] on,x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
}
}
}
else
{
switch (controlPointCount)
{
case 0:
{ //bit 1 set=> off curve, this is a control point
//if this is a 2nd order or 3rd order control point
if (((vtag >> 1) & 0x1) != 0)
{
//printf("[%d] bzc3rd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
thirdControlPoint = vpoint;
}
else
{
//printf("[%d] bzc2nd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
secondControlPoint = vpoint;
}
}
break;
case 1:
{
if (((vtag >> 1) & 0x1) != 0)
{
//printf("[%d] bzc3rd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
thirdControlPoint = vpoint;
}
else
{
//we already have prev second control point
//so auto calculate line to
//between 2 point
var mid = GetMidPoint(secondControlPoint, vpoint);
//----------
//generate curve3
ps.Curve3(secondControlPoint.x / resize, secondControlPoint.y / resize,
mid.x / resize, mid.y / resize);
//------------------------
controlPointCount--;
//------------------------
//printf("[%d] bzc2nd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
secondControlPoint = vpoint;
}
}
break;
default:
{
throw new NotSupportedException();
}
break;
}
controlPointCount++;
justFromCurveMode = true;
}
}
//--------
//close figure
//if in curve mode
if (justFromCurveMode)
{
switch (controlPointCount)
{
case 0: break;
case 1:
{
ps.Curve3(secondControlPoint.x / resize, secondControlPoint.y / resize,
ps.LastMoveX, ps.LastMoveY);
}
break;
case 2:
{
ps.Curve4(secondControlPoint.x / resize, secondControlPoint.y / resize,
thirdControlPoint.x / resize, thirdControlPoint.y / resize,
ps.LastMoveX, ps.LastMoveY);
}
break;
default:
{ throw new NotSupportedException(); }
}
justFromCurveMode = false;
controlPointCount = 0;
}
ps.CloseFigure();
//--------
startContour++;
todoContourCount--;
}
fontGlyph.flattenVxs = curveFlattener.MakeVxs(fontGlyph.originalVxs);
}