List<LinkedList<ControlPoint>> CreateContours(Glyph glyphData, out List<Triangle> triangles)
{
triangles = new List<Triangle>();
var contours = new List<LinkedList<ControlPoint>>();
foreach (List<ControlPoint> contour in glyphData.Contours)
{
if (contour.Count > 1)
{
var innerPoints = new LinkedList<ControlPoint>();
contours.Add(innerPoints);
Triangle firstTriangle = null;
for (int i = 0, a = contour.Count - 1, b = 1; i < contour.Count; a = i, b = (b + 1) % contour.Count, i++)
{
ControlPoint point = contour[i];
if (point.IsOnCurve)
{
innerPoints.AddLast(point);
}
else
{
var pointBefore = contour[a];
if (!pointBefore.IsOnCurve)
{
pointBefore = (pointBefore + point) / 2;
innerPoints.AddLast(pointBefore);
}
var pointAfter = contour[b];
if (!pointAfter.IsOnCurve) pointAfter = (pointAfter + point) / 2;
var triangle = new Triangle(point, pointBefore, pointAfter);
if (i > 0)
triangle.BNode = innerPoints.Last;
else
firstTriangle = triangle;
triangles.Add(triangle);
}
}
if (firstTriangle != null && firstTriangle.BNode == null)
firstTriangle.BNode = contour.Last().IsOnCurve ? innerPoints.Last : innerPoints.First;
}
}
return contours;
}
Glyph[] ParseGlyfTable(Stream stream, BinaryReader reader, TableHeader glyfHeader, TableHeader locaHeader, int glyphCount, bool useLongIndexFormat)
{
stream.Position = locaHeader.Offset;
var glyphOffsets = new long[glyphCount + 1];
Func<long> read = useLongIndexFormat
? new Func<long>(() => (long)reader.ReadUInt32())
: new Func<long>(() => reader.ReadUInt16() * 2L);
for (int i = 0; i < glyphCount + 1; i++)
glyphOffsets[i] = read();
var glyphs = new Glyph[glyphCount];
for (int i = 0; i < glyphCount; i++)
{
if (glyphOffsets[i + 1] - glyphOffsets[i] <= 0)
{
glyphs[i] = Glyph.Empty;
}
else
{
stream.Position = glyfHeader.Offset + glyphOffsets[i];
glyphs[i] = new Glyph(stream, reader);
}
}
return glyphs;
}
public TriangulatedGlyph(Glyph glyphData, TrueTypeFile.HorizontalMetric horizontalMetric)
{
indices = new List<int>();
vertices = new List<Vertex>();
advanceWidth = horizontalMetric.AdvanceWidth;
leftSideBearing = horizontalMetric.LeftSideBearing;
if (glyphData.IsCompound)
{
}
else
{
if (glyphData.Contours.Length == 0)
return;
List<Triangle> triangles;
List<LinkedList<ControlPoint>> contours = CreateContours(glyphData, out triangles);
int count = 0;
bool split;
do
{
split = SplitTriangles(ref triangles);
count++;
} while (split && count < 4);
foreach (var triangle in triangles)
{
ControlPoint p = (triangle.B + triangle.C) / 2;
int windingNumber = GetWindingNumber(p, glyphData);
triangle.IsInside = windingNumber == 0;
if (triangle.IsInside) triangle.Contour.AddAfter(triangle.BNode, triangle.A);
}
PolyTree tree = ClipperHelper.Combine(contours.Select(contour => contour.ToList()).ToList());
int pointIndex = 0;
var inputGeometry = new InputGeometry();
SearchTree(inputGeometry, ref pointIndex, tree);
if (inputGeometry.Count > 0)
{
var mesh = new Mesh();
mesh.Triangulate(inputGeometry);
int highestIndex = 0;
var indexDict = new Dictionary<int, int>();
foreach (TriangleNet.Data.Triangle triangle in mesh.Triangles)
{
int[] newIndices;
List<Vertex> newVertices = IndexVertices(triangle, indexDict, ref highestIndex, out newIndices);
indices.AddRange(newIndices);
vertices.AddRange(newVertices);
}
foreach (var triangle in triangles)
{
indices.Add(vertices.Count);
vertices.Add(new Vertex((float)triangle.B.X, (float)triangle.B.Y, 0, 0, triangle.IsInside));
indices.Add(vertices.Count);
vertices.Add(new Vertex((float)triangle.A.X, (float)triangle.A.Y, 0.5f, 0, triangle.IsInside));
indices.Add(vertices.Count);
vertices.Add(new Vertex((float)triangle.C.X, (float)triangle.C.Y, 1, 1, triangle.IsInside));
}
}
}
}
int GetWindingNumber(ControlPoint p, Glyph glyphData)
{
ControlPoint p2 = new ControlPoint(p.X + 1000, p.Y);
int result = 0;
foreach (var contour in glyphData.Contours)
{
for (int a = contour.Count - 1, b = 0; b < contour.Count; a = b, b++)
{
ControlPoint pa = contour[a];
ControlPoint pb = contour[b];
if (pa.Y > p.Y && pb.Y < p.Y)
{
if (pa.X > p.X && pb.X > p.X)
{
result++;
}
else if ((pa.X > p.X && pb.X < p.X) || (pa.X < p.X && pb.X > p.X))
{
ControlPoint r = p2 - p;
ControlPoint s = pb - pa;
double t = ControlPoint.VectorProduct((pa - p), s) / ControlPoint.VectorProduct(r, s);
double u = ControlPoint.VectorProduct((p - pa), r) / ControlPoint.VectorProduct(s, r);
if (t >= 0 && u >= 0 && u <= 1) result++;
}
}
else if (pa.Y < p.Y && pb.Y > p.Y)
{
if (pa.X > p.X && pb.X > p.X)
{
result--;
}
else if ((pa.X > p.X && pb.X < p.X) || (pa.X < p.X && pb.X > p.X))
{
ControlPoint r = p2 - p;
ControlPoint s = pb - pa;
double t = ControlPoint.VectorProduct((pa - p), s) / ControlPoint.VectorProduct(r, s);
double u = ControlPoint.VectorProduct((p - pa), r) / ControlPoint.VectorProduct(s, r);
if (t >= 0 && u >= 0 && u <= 1) result--;
}
}
}
}
return result;
}
