public static double ToPx(this PrimitiveTerm term, StyleContext context, bool isFont)
{
switch (term.PrimitiveType)
{
case UnitType.Centimeter:
return Math.Round(((float)term.Value) / 2.54 * context.Global.Dpi);
case UnitType.Ems:
return Math.Round(((float)term.Value) * context.FontSizePx);
case UnitType.Exs:
return Math.Round(((float)term.Value) * context.FontSizePx * 0.447265);
case UnitType.Inch:
return Math.Round(((float)term.Value) * context.Global.Dpi);
case UnitType.Millimeter:
return Math.Round(((float)term.Value) / 25.4 * context.Global.Dpi);
case UnitType.Percentage:
return Math.Round(((float)term.Value) * (isFont ? context.FontSizePx : context.ContentWidth) / 100.0);
case UnitType.Number:
case UnitType.Pixel:
return System.Convert.ToDouble(term.Value);
case UnitType.Point:
return Math.Round(((float)term.Value) * 96.0 / 72);
case UnitType.ViewportHeight:
return Math.Round(((float)term.Value) * context.Global.ViewportHeight / 100.0);
case UnitType.ViewportMax:
return Math.Round(((float)term.Value) * Math.Max(context.Global.ViewportWidth, context.Global.ViewportHeight) / 100.0);
case UnitType.ViewportMin:
return Math.Round(((float)term.Value) * Math.Min(context.Global.ViewportWidth, context.Global.ViewportHeight) / 100.0);
case UnitType.ViewportWidth:
return Math.Round(((float)term.Value) * context.Global.ViewportWidth / 100.0);
default:
throw new NotSupportedException();
}
}
private static bool MediaMatches(MediaDefinition d, GlobalStyleContext settings)
{
var context = new StyleContext();
var result = (d.Modifier != MediaTypeModifier.Not && (d.Type & settings.Media) > 0) ||
(d.Modifier == MediaTypeModifier.Not && (d.Type & settings.Media) == 0);
if (result)
{
var width = d.Properties.Where(p => string.Compare(p.Name, "width", StringComparison.OrdinalIgnoreCase) == 0 ||
p.Name.EndsWith("-width", StringComparison.OrdinalIgnoreCase));
var plainProps = width.OfType<MediaPropertyPlain>();
double px;
foreach (var plain in plainProps)
{
px = ToPx(plain.Value as PrimitiveTerm, context, false);
if (plain.Name.StartsWith("max-", StringComparison.OrdinalIgnoreCase) && px > settings.MediaWidth) return false;
if (plain.Name.StartsWith("min-", StringComparison.OrdinalIgnoreCase) && px < settings.MediaWidth) return false;
}
var rangeProps = width.OfType<MediaPropertyRange>();
foreach (var range in rangeProps)
{
if (range.LowerBound != null)
{
px = ToPx(range.LowerBound as PrimitiveTerm, context, false);
if (settings.MediaWidth < px || (settings.MediaWidth == px && !range.LowerCompare.EndsWith("="))) return false;
}
if (range.UpperBound != null)
{
px = ToPx(range.UpperBound as PrimitiveTerm, context, false);
if (settings.MediaWidth > px || (settings.MediaWidth == px && !range.UpperCompare.EndsWith("="))) return false;
}
}
}
return result;
}