public void Build()
{
if (!_isDirty || _text == null || _font == null)
{
return;
}
if (_vbuffer == null)
{
_vbuffer = new VertexBuffer(VertexFormat.PositionColorUV);
}
if (_ibuffer == null)
{
_ibuffer = new IndexBuffer();
}
var i = 0;
TextRun run = null;
var lines = new List <List <TextRun> >();
var line = new List <TextRun>();
//var nestedRuns = new Stack<TextRun>();
//var nestedTags = new Stack<string>();
lines.Add(line);
run = new TextRun(_font, i, _kerning, _color);
line.Add(run);
var trim = false;
while (i < _text.Length)
{
if (char.IsLowSurrogate(_text, i))
{
i++;
continue;
}
if (trim)
{
if (char.IsWhiteSpace(_text, i))
{
i++;
continue;
}
else
{
trim = false;
}
}
var c = char.ConvertToUtf32(_text, i++);
if (c == '\n')
{
run.End = i;
line = new List <TextRun>();
lines.Add(line);
run = new TextRun(run, i);
line.Add(run);
continue;
}
else if (c < 32)
{
continue;
}
var ch = run.Font[c];
if (ch == null)
{
ch = run.Font['?'];
if (ch == null)
{
ch = run.Font[' '];
if (ch == null)
{
continue;
}
}
}
run.Push(ch);
if (_width > 0f && line.Sum(tr => tr.Width) > _width)
{
int count;
var back = run.FindBreak(out count);
if (i - back <= run.Start)
{
if (line.Count > 1)
{
line.RemoveAt(line.Count - 1);
line = new List <TextRun>();
lines.Add(line);
line.Add(run);
trim = true;
continue;
}
else
{
back = 1;
}
}
i -= back - count;
run.Pop(back);
line = new List <TextRun>();
lines.Add(line);
run = new TextRun(run, i);
line.Add(run);
trim = true;
}
}
run.End = i;
_actualSize.X = lines.Max(l => l.Sum(tr => tr.Width));
_actualSize.Y = lines.Sum(l => l.Max(tr => tr.Height) + _leading);
var vertices = new List <float>();
var indices = new List <int>();
var y = 0f;
for (i = lines.Count - 1; i >= 0; --i)
{
var tl = lines[i];
var x = 0f;
if (_halign == HorizontalAlignment.Right)
{
x = _width - tl.Sum(tr => tr.Width);
}
else if (_halign == HorizontalAlignment.Center)
{
x = Mathf.Floor((_width - tl.Sum(tr => tr.Width)) / 2f);
}
foreach (var tr in tl)
{
tr.Build(vertices, indices, new Vector3(x, y + (tr.Font.LineHeight - tr.Font.Base), 0f));
x += tr.Width;
}
y += tl.Max(tr => tr.Height) + _leading;
}
_vbuffer.Data = vertices.ToArray();
_vbuffer.Commit();
_ibuffer.Data = indices.ToArray();
_ibuffer.Commit();
_isDirty = false;
}