/// <summary>
/// Returns the vertical metrics based on the current text style.<br/>
/// Measured values are returned in local coordinate space.
/// </summary>
public static void TextMetrics(this Nvg nvg, out float ascender, out float descender, out float lineh)
{
Fontstash fons = nvg.fontManager.Fontstash;
State state = nvg.stateStack.CurrentState;
float scale = nvg.fontManager.GetFontScale() * nvg.pixelRatio.DevicePxRatio;
float invscale = 1.0f / scale;
if (state.FontId == Fontstash.INVALID)
{
ascender = descender = lineh = -1.0f;
return;
}
fons.SetSize(state.FontSize * scale);
fons.SetSpacing(state.LetterSpacing * scale);
fons.SetBlur(state.FontBlur * scale);
fons.SetAlign((int)state.TextAlign);
fons.SetFont(state.FontId);
fons.VertMetrics(out ascender, out descender, out lineh);
ascender *= invscale;
descender *= invscale;
lineh *= invscale;
}
