public FontSize(Font font, int size, string charset)
{
if (font.Disposed)
{
throw new Exception("Cannot get Font data as it is disposed");
}
Font = font;
Size = size;
Scale = font.GetScale(size);
Ascent = font.Ascent * Scale;
Descent = font.Descent * Scale;
LineGap = font.LineGap * Scale;
Height = Ascent - Descent;
LineHeight = Height + LineGap;
for (int i = 0; i < charset.Length; i++)
{
// get font info
var unicode = charset[i];
var glyph = font.GetGlyph(unicode);
if (glyph > 0)
{
unsafe
{
int advance, offsetX, x0, y0, x1, y1;
StbTrueType.stbtt_GetGlyphHMetrics(font.fontInfo, glyph, &advance, &offsetX);
StbTrueType.stbtt_GetGlyphBitmapBox(font.fontInfo, glyph, Scale, Scale, &x0, &y0, &x1, &y1);
int w = (x1 - x0);
int h = (y1 - y0);
// define character
var ch = new Character
{
Unicode = unicode,
Glyph = glyph,
Width = w,
Height = h,
Advance = advance * Scale,
OffsetX = offsetX * Scale,
OffsetY = y0
};
ch.HasGlyph = (w > 0 && h > 0 && StbTrueType.stbtt_IsGlyphEmpty(font.fontInfo, ch.Glyph) == 0);
Charset[unicode] = ch;
}
}
}
}