/// <summary>
/// Creates a bitmap for each character in the font.
/// Characters that the font does not include will not be assigned a bitmap.
/// </summary>
private void CreateBitmaps()
{
characters = new Dictionary <char, PixelSet>();
ImageSurface surface = new ImageSurface(Format.RGB24, 1, 1);
Context context = new Context(surface);
context.SelectFontFace(FontName, FontSlant.Normal, FontWeight.Normal);
context.SetFontSize(Font.Size);
TextExtents ext = context.TextExtents("@");
int charW = (int)Math.Ceiling(ext.Width);
int charH = (int)Math.Ceiling(ext.Height);
context.Dispose();
surface.Dispose();
surface = new ImageSurface(Format.RGB24, charW, charH);
context = new Context(surface);
PixelSet missingChar = null;
for (int i = 0; i < asciiString.Length; i++)
{
// Render one character into a PixelSet
string asciiChar = string.Empty + asciiString[i];
context.SelectFontFace(FontName, FontSlant.Normal, FontWeight.Normal);
context.SetFontSize(Font.Size);
context.SetSourceRGB(0.067, 0.067, 0.067);
context.Paint();
context.SetSourceRGB(1, 1, 1);
ext = context.TextExtents(asciiChar);
context.MoveTo(ext.XBearing, ext.YBearing * -1);
context.ShowText(asciiChar);
PixelSet ch = new PixelSet(surface);
// Filter out characters the font doesn't include
// The first character is always unprintable, and serves as
// a reference for what unprintable characters look like in this font
if (i == 0)
{
missingChar = ch;
continue;
}
else if (ch == missingChar)
{
continue;
}
characters.Add(asciiString[i], ch);
}
context.Dispose();
surface.Dispose();
// Add the space manually if it wasn't included
if (!characters.ContainsKey(' '))
{
var en = characters.Values.GetEnumerator();
en.MoveNext();
characters.Add(' ', new PixelSet(en.Current.Width, en.Current.Height));
}
}
/// <summary>
/// Inverts the color of a PixelSet.
/// </summary>
/// <returns>Inverted PixelSet</returns>
public PixelSet Invert()
{
PixelSet p = new PixelSet(Width, Height);
for (uint x = 0; x < Width; x++)
{
for (uint y = 0; y < Height; y++)
{
p.Pixels[0, x][y] = (byte)(255 - pixels[0, x][y]);
p.Pixels[1, x][y] = (byte)(255 - pixels[1, x][y]);
p.Pixels[2, x][y] = (byte)(255 - pixels[2, x][y]);
}
}
return(p);
}
/// <summary>
/// Gets a list of all PixelSets that are associated to characters.
/// </summary>
/// <returns>Array of PixelSets</returns>
public PixelSet[] GetCharacterPixels()
{
PixelSet[] chars = new PixelSet[characters.Count];
characters.Values.CopyTo(chars, 0);
return(chars);
}
