public LineHeightSpan(TextPaint?paint, double lineHeight)
{
_lineHeight = lineHeight;
var fm = paint?.GetFontMetricsInt();
_ascent = fm?.Ascent ?? 1;
_descent = fm?.Descent ?? 1;
}
private float GetSpacingAdd(TextPaint paint)
{
if (_lineHeight == 0f)
{
return(0f);
}
// Use integer font metrics to match StaticLayout's usage and avoid pixel rounding errors
var fmi = paint.GetFontMetricsInt();
var baseLineHeight = fmi.Descent - fmi.Ascent;
float spacingOffset = _lineHeight - baseLineHeight;
if (_lineStackingStrategy == LineStackingStrategy.MaxHeight)
{
//If LineStackingStrategy is MaxHeight, don't apply negative spacing
spacingOffset = Math.Max(0f, spacingOffset);
}
return(spacingOffset);
}