/// <summary>
/// Loads the glyphs from a font.
/// </summary>
/// <param name="font">The font.</param>
/// <returns>The <see cref="Task" /> that represents the asynchronous operation.</returns>
private async Task Load(Font font)
{
using (font)
{
var size = (int)Math.Ceiling(font.GetHeight());
var rows = (int)Math.Ceiling(Math.Sqrt(characters.Length));
var columns = (int)Math.Ceiling(characters.Length / (double)rows);
using (var drawing = new Drawing(size * columns, size * rows))
{
await Task.Run(delegate
{
drawing.Draw(g =>
{
var format = new StringFormat
{
Alignment = StringAlignment.Center,
LineAlignment = StringAlignment.Center,
FormatFlags = StringFormatFlags.MeasureTrailingSpaces,
};
g.CompositingMode = CompositingMode.SourceCopy;
g.Clear(Color.FromArgb(1, 255, 255, 255));
g.CompositingMode = CompositingMode.SourceOver;
g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
for (var i = 0; i < characters.Length; i++)
{
var row = i / columns;
var col = i % columns;
g.DrawString(characters[i].ToString(), font, Brushes.White, new RectangleF(col * size, row * size, size, size), format);
}
var kerningInfo = font.GetKerningInfo();
for (var i = 0; i < this.glyphs.Length; i++)
{
var kerning = new float[this.characters.Length];
var spacing = Math.Max(1, size * SpacingFactor);
for (var c = 0; c < this.characters.Length; c++)
{
var info = kerningInfo.GetValueOrDefault(this.characters[i]);
if (info != null)
{
kerning[c] = spacing + info.GetValueOrDefault(this.characters[c]);
}
else
{
kerning[c] = spacing;
}
}
this.glyphs[i] = new BitmapGlyph(this.Texture, this.characters, kerning);
}
this.whitespace.Width = Math.Max(8, size * EscapementFactor);
this.whitespace.Height = size;
});
drawing.Scan(this.glyphs, columns, SpriteScanOptions.ScanHorizontally);
});
drawing.CopyTo(this.Texture.Image);
}
}
}