private static Dictionary <string, string> BuildFontDictionary()
{
var fontDictionary = new Dictionary <string, string>();
RegistryKey fontsKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts", false);
if (fontsKey == null)
{
return(fontDictionary);
}
string[] valueNames = fontsKey.GetValueNames();
string strFontsFolder = Path.Combine(Directory.GetParent(Environment.GetFolderPath(Environment.SpecialFolder.System)).FullName, "Fonts");
foreach (string fontKey in valueNames)
{
string registryFontFileName = (string)fontsKey.GetValue(fontKey);
if ((registryFontFileName != null) && Path.GetExtension(registryFontFileName).Equals(".ttf", StringComparison.InvariantCultureIgnoreCase))
{
var trueType = new TrueType();
trueType.Load(Path.Combine(strFontsFolder, registryFontFileName));
fontDictionary[trueType.FontFamilyName] = trueType.PostScriptFontName;
}
}
return(fontDictionary);
}
public void Start(int width, int height, bool skipMissing = true)
{
bitmapWidth = width;
bitmapHeight = height;
_bitmap = new byte[width * height];
TrueType.PackPrepare(_context, skipMissing, width, height, width, 1);
_glyphs.Clear();
}
public void Add(
ReadOnlyMemory <byte> fontData,
int fontIndex,
float pixelHeight,
ReadOnlySpan <CharacterRange> ranges)
{
if (fontData.IsEmpty)
{
throw new ArgumentException(nameof(fontData));
}
if (pixelHeight <= 0)
{
throw new ArgumentOutOfRangeException(nameof(pixelHeight));
}
if (ranges.IsEmpty)
{
throw new ArgumentException();
}
var fontInfo = new TrueType.FontInfo();
if (!TrueType.InitFont(fontInfo, fontData, fontIndex))
{
throw new Exception("Failed to init font.");
}
var scale = TrueType.ScaleForPixelHeight(fontInfo, pixelHeight);
TrueType.GetFontVMetrics(fontInfo, out int ascent, out _, out _);
foreach (var range in ranges)
{
if (range.Start > range.End)
{
continue;
}
var charData = new TrueType.PackedChar[range.Size];
TrueType.PackFontRange(
_context, _bitmap, fontData, pixelHeight, range.Start, charData);
for (int i = 0; i < charData.Length; ++i)
{
var yOff = charData[i].offset0.Y;
yOff += ascent * scale.X;
var glyphInfo = new GlyphInfo(
x: charData[i].x0,
y: charData[i].y0,
width: charData[i].x1 - charData[i].x0,
height: charData[i].y1 - charData[i].y0,
xOffset: (int)charData[i].offset0.X,
yOffset: (int)Math.Round(yOff),
xAdvance: (int)Math.Round(charData[i].xadvance));
_glyphs[i + range.Start] = glyphInfo;
}
}
}
internal static extern Error FT_Get_Sfnt_Name(IntPtr face, uint idx, out TrueType.Internal.SfntNameRec aname);
