/// <summary>
/// Converts an <see cref="Image" /> (or an object that can be cast to an <see cref="Image" />) to the specified type.
/// </summary>
/// <param name="context">An <see cref="ITypeDescriptorContext" /> that provides a format context. In this converter this parameter is ignored.</param>
/// <param name="culture">A <see cref="CultureInfo" />. In this converter this parameter is ignored.</param>
/// <param name="value">The <see cref="Image" /> to convert.</param>
/// <param name="destinationType">The <see cref="Type" /> to convert the <see cref="Image" /> to.
/// This type converter supports <see cref="Array">byte[]</see> type.</param>
/// <returns>An <see cref="object" /> that represents the converted value.</returns>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType != typeof(byte[]) || !(value is Image))
{
return(base.ConvertTo(context, culture, value, destinationType));
}
// 1.) Metafile: Saving as EMF/WMF (base would save a PNG here)
if (value is Metafile metafile)
{
using (var ms = new MemoryStream())
{
metafile.Save(ms);
return(ms.ToArray());
}
}
// 2.) Icon bitmap: Preserving images at least in one color depth
var bitmap = (Bitmap)value;
if (bitmap.RawFormat.Guid == ImageFormat.Icon.Guid)
{
Bitmap[] images = bitmap.ExtractIconImages();
using (Icon icon = Icons.Combine(images))
{
images.ForEach(i => i.Dispose());
using (var ms = new MemoryStream())
{
icon.Save(ms);
return(ms.ToArray());
}
}
}
// 3.) TIFF: Saving every page
if (bitmap.RawFormat.Guid == ImageFormat.Tiff.Guid)
{
Bitmap[] images = bitmap.ExtractBitmaps();
using (var ms = new MemoryStream())
{
images.SaveAsMultipageTiff(ms);
return(ms.ToArray());
}
}
// 4.) Any other: base works well
return(base.ConvertTo(context, culture, value, destinationType));
}