public GlyphTypefaceImpl(Typeface typeface)
{
Typeface = TypefaceCache.Get(typeface.FontFamily, typeface.Weight, typeface.Style).SKTypeface;
Face = new Face(GetTable)
{
UnitsPerEm = Typeface.UnitsPerEm
};
Font = new Font(Face);
Font.SetFunctionsOpenType();
Font.GetScale(out var xScale, out _);
DesignEmHeight = (short)xScale;
if (!Font.TryGetHorizontalFontExtents(out var fontExtents))
{
Font.TryGetVerticalFontExtents(out fontExtents);
}
Ascent = -fontExtents.Ascender;
Descent = -fontExtents.Descender;
LineGap = fontExtents.LineGap;
if (Font.OpenTypeMetrics.TryGetPosition(OpenTypeMetricsTag.UnderlineOffset, out var underlinePosition))
{
UnderlinePosition = underlinePosition;
}
if (Font.OpenTypeMetrics.TryGetPosition(OpenTypeMetricsTag.UnderlineSize, out var underlineThickness))
{
UnderlineThickness = underlineThickness;
}
if (Font.OpenTypeMetrics.TryGetPosition(OpenTypeMetricsTag.StrikeoutOffset, out var strikethroughPosition))
{
StrikethroughPosition = strikethroughPosition;
}
if (Font.OpenTypeMetrics.TryGetPosition(OpenTypeMetricsTag.StrikeoutSize, out var strikethroughThickness))
{
StrikethroughThickness = strikethroughThickness;
}
}
public FormattedTextImpl(
string text,
Typeface typeface,
double fontSize,
TextAlignment textAlignment,
TextWrapping wrapping,
Size constraint,
IReadOnlyList <FormattedTextStyleSpan> spans)
{
Text = text ?? string.Empty;
// Replace 0 characters with zero-width spaces (200B)
Text = Text.Replace((char)0, (char)0x200B);
var entry = TypefaceCache.Get(typeface.FontFamily, typeface.Weight, typeface.Style);
_paint = new SKPaint
{
TextEncoding = SKTextEncoding.Utf16,
IsStroke = false,
IsAntialias = true,
LcdRenderText = true,
SubpixelText = true,
Typeface = entry.SKTypeface,
TextSize = (float)fontSize,
TextAlign = textAlignment.ToSKTextAlign()
};
//currently Skia does not measure properly with Utf8 !!!
//Paint.TextEncoding = SKTextEncoding.Utf8;
_wrapping = wrapping;
_constraint = constraint;
if (spans != null)
{
foreach (var span in spans)
{
if (span.ForegroundBrush != null)
{
SetForegroundBrush(span.ForegroundBrush, span.StartIndex, span.Length);
}
}
}
Rebuild();
}
public Typeface GetTypeface(FontFamily fontFamily, FontWeight fontWeight, FontStyle fontStyle)
{
return(TypefaceCache.Get(fontFamily.Name, fontWeight, fontStyle).Typeface);
}