public SKTypeface GetTypeFace(Typeface typeface)
{
var styleSlant = SKFontStyleSlant.Upright;
switch (typeface.Style)
{
case FontStyle.Italic:
styleSlant = SKFontStyleSlant.Italic;
break;
case FontStyle.Oblique:
styleSlant = SKFontStyleSlant.Oblique;
break;
}
if (!_fontFamilies.TryGetValue(typeface.FontFamily.Name, out var fontFamily))
{
return(TypefaceCache.GetTypeface(TypefaceCache.DefaultFamilyName, typeface.Style, typeface.Weight));
}
var weight = (SKFontStyleWeight)typeface.Weight;
var key = new FontKey(weight, styleSlant);
return(fontFamily.GetOrAdd(key, GetFallback(fontFamily, key)));
}
public FormattedTextImpl(string text, string fontFamilyName, double fontSize, FontStyle fontStyle,
TextAlignment textAlignment, FontWeight fontWeight, TextWrapping wrapping)
{
_text = text ?? string.Empty;
// Replace 0 characters with zero-width spaces (200B)
_text = _text.Replace((char)0, (char)0x200B);
var typeface = TypefaceCache.GetTypeface(fontFamilyName, fontStyle, fontWeight);
_paint = new SKPaint();
//currently Skia does not measure properly with Utf8 !!!
//Paint.TextEncoding = SKTextEncoding.Utf8;
_paint.TextEncoding = SKTextEncoding.Utf16;
_paint.IsStroke = false;
_paint.IsAntialias = true;
_paint.Typeface = typeface;
_paint.TextSize = (float)fontSize;
_paint.TextAlign = textAlignment.ToSKTextAlign();
_wrapping = wrapping;
Rebuild();
}
public static FormattedTextImpl Create(string text, string fontFamilyName, double fontSize, FontStyle fontStyle,
TextAlignment textAlignment, FontWeight fontWeight)
{
var typeface = TypefaceCache.GetTypeface(fontFamilyName, fontStyle, fontWeight);
FormattedTextImpl instance = new FormattedTextImpl(text);
instance.Paint.Typeface = typeface;
instance.Paint.TextSize = (float)fontSize;
instance.Paint.TextAlign = textAlignment.ToSKTextAlign();
instance.Rebuild();
return(instance);
}
public FormattedTextImpl(
string text,
Typeface typeface,
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 skiaTypeface = TypefaceCache.GetTypeface(
typeface?.FontFamilyName ?? "monospace",
typeface?.Style ?? FontStyle.Normal,
typeface?.Weight ?? FontWeight.Normal);
_paint = new SKPaint();
//currently Skia does not measure properly with Utf8 !!!
//Paint.TextEncoding = SKTextEncoding.Utf8;
_paint.TextEncoding = SKTextEncoding.Utf16;
_paint.IsStroke = false;
_paint.IsAntialias = true;
_paint.LcdRenderText = true;
_paint.SubpixelText = true;
_paint.Typeface = skiaTypeface;
_paint.TextSize = (float)(typeface?.FontSize ?? 12);
_paint.TextAlign = textAlignment.ToSKTextAlign();
_paint.BlendMode = SKBlendMode.Src;
_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 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 FormattedTextImpl(
string text,
Typeface typeface,
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);
SKTypeface skiaTypeface = TypefaceCache.Default;
if (typeface.FontFamily.Key != null)
{
var typefaces = SKTypefaceCollectionCache.GetOrAddTypefaceCollection(typeface.FontFamily);
skiaTypeface = typefaces.GetTypeFace(typeface);
}
else
{
if (typeface.FontFamily.FamilyNames.HasFallbacks)
{
foreach (var familyName in typeface.FontFamily.FamilyNames)
{
skiaTypeface = TypefaceCache.GetTypeface(
familyName,
typeface.Style,
typeface.Weight);
if (skiaTypeface != TypefaceCache.Default)
{
break;
}
}
}
else
{
skiaTypeface = TypefaceCache.GetTypeface(
typeface.FontFamily.Name,
typeface.Style,
typeface.Weight);
}
}
_paint = new SKPaint();
//currently Skia does not measure properly with Utf8 !!!
//Paint.TextEncoding = SKTextEncoding.Utf8;
_paint.TextEncoding = SKTextEncoding.Utf16;
_paint.IsStroke = false;
_paint.IsAntialias = true;
_paint.LcdRenderText = true;
_paint.SubpixelText = true;
_paint.Typeface = skiaTypeface;
_paint.TextSize = (float)typeface.FontSize;
_paint.TextAlign = textAlignment.ToSKTextAlign();
_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);
}