/// <summary>
/// Generates kerning pairs using HarfBuzz.
/// </summary>
private static void GenerateKerningPairs(FontCharCollection fontChars, Face face, TftConfig config)
{
var font = SharpFont.HarfBuzz.Font.FromFTFace(face);
foreach (var fontChar in fontChars)
{
var lhs = fontChar.Char;
var kerningCharset = FontRenderer.KerningPairCharsets.FirstOrDefault(c => c.Contains(lhs));
if (kerningCharset == null)
{
continue;
}
config.CustomKerningPairs.TryGetValue(lhs, out var customKernings);
var leftGlyphId = face.GetCharIndex(lhs);
foreach (var rhs in kerningCharset)
{
if (customKernings != null && TryGetKerning(rhs, out var kerningPair))
{
fontChar.AddOrReplaceKerningPair(kerningPair.Char, kerningPair.Kerning);
continue;
}
if (!fontChars.Contains(rhs) || fontChar.ContainsKerningFor(rhs))
{
continue;
}
var rightGlyphId = face.GetCharIndex(rhs);
// 0 is undefined character
if (rightGlyphId == 0)
{
continue;
}
var kerningAmount = font.GetHorizontalKerning(leftGlyphId, rightGlyphId) / 64f;
kerningAmount = config.IsSdf ? kerningAmount * config.SdfScale : kerningAmount;
if (kerningAmount != 0)
{
fontChar.KerningPairs = fontChar.KerningPairs ?? new List <KerningPair>();
fontChar.KerningPairs.Add(new KerningPair {
Char = rhs, Kerning = kerningAmount
});
}
}
bool TryGetKerning(char c, out KerningPair kerningPair)
{
foreach (var customKerning in customKernings)
{
if (customKerning.Char == c)
{
kerningPair = customKerning;
return(true);
}
}
kerningPair = default;
return(false);
}
}
}
public Font()
{
CharCollection = new FontCharCollection();
}
public Font(FontCharCollection chars)
{
CharCollection = chars;
}
/// <summary>
/// Generates Tangerine Font.
/// </summary>
/// <param name="config"> Tangerine Font Config. </param>
/// <param name="assetDirectory"> Path to asset directory. </param>
/// <param name="outputPath"> Path for Tangerine Font and it's textures </param>
public static void GenerateFont(TftConfig config, string assetDirectory, string outputPath)
{
var fontCharCollection = new FontCharCollection();
var chars = new CharCache(config.Height, null, fontCharCollection.Textures)
{
Padding = config.Padding,
MinTextureSize = config.TextureSize,
MaxTextureSize = config.TextureSize,
};
var missingCharacters = new List <char>();
var margin = new Vector2(config.Margin * .5f);
foreach (var charSet in config.CharSets)
{
var fontPath = AssetPath.Combine(assetDirectory, charSet.Font);
if (!File.Exists(fontPath))
{
Console.WriteLine($"Missing font: {fontPath}\n Please ensure font existence!!!");
return;
}
var fontData = File.ReadAllBytes(fontPath);
chars.FontRenderer = new FontRenderer(fontData)
{
LcdSupported = false
};
missingCharacters.Clear();
foreach (var c in charSet.Chars)
{
if (config.ExcludeChars.Any(character => character == c))
{
continue;
}
var fontChar = chars.Get(c);
if (fontChar == FontChar.Null)
{
missingCharacters.Add(c);
continue;
}
fontChar.ACWidths += margin;
if (config.IsSdf)
{
fontChar.ACWidths *= config.SdfScale;
fontChar.Height *= config.SdfScale;
fontChar.Width *= config.SdfScale;
fontChar.Padding *= config.SdfScale;
fontChar.VerticalOffset *= config.SdfScale;
if (fontChar.KerningPairs != null)
{
for (int i = 0; i < fontChar.KerningPairs.Count; i++)
{
var pair = fontChar.KerningPairs[i];
pair.Kerning *= config.SdfScale;
fontChar.KerningPairs[i] = pair;
}
}
}
fontCharCollection.Add(fontChar);
}
if (missingCharacters.Count > 0)
{
Console.WriteLine($"Characters: {string.Join("", missingCharacters)} -- are missing in font {charSet.Font}");
}
GenerateKerningPairs(fontCharCollection, chars.FontRenderer.Face, config);
}
if (config.IsSdf)
{
foreach (var texture in fontCharCollection.Textures)
{
SdfConverter.ConvertToSdf(texture.GetPixels(), texture.ImageSize.Width, texture.ImageSize.Height, config.Padding / 2);
}
}
using (var font = new Font(fontCharCollection)) {
SaveAsTft(font, config, assetDirectory, outputPath);
}
}