/// <summary>
/// Creates a reference to an application-specific font file resource.
/// </summary>
/// <param name="factory">A reference to a DirectWrite factory <see cref="Factory"/></param>
/// <param name="fontFileReferenceKey">A font file reference key that uniquely identifies the font file resource during the lifetime of fontFileLoader.</param>
/// <param name="fontFileReferenceKeySize">The size of the font file reference key in bytes.</param>
/// <param name="fontFileLoader">The font file loader that will be used by the font system to load data from the file identified by fontFileReferenceKey.</param>
/// <remarks>
/// This function is provided for cases when an application or a document needs to use a private font without having to install it on the system. fontFileReferenceKey has to be unique only in the scope of the fontFileLoader used in this call.
/// </remarks>
/// <unmanaged>HRESULT IDWriteFactory::CreateCustomFontFileReference([In, Buffer] const void* fontFileReferenceKey,[None] int fontFileReferenceKeySize,[None] IDWriteFontFileLoader* fontFileLoader,[Out] IDWriteFontFile** fontFile)</unmanaged>
public FontFile(Factory factory, IntPtr fontFileReferenceKey, int fontFileReferenceKeySize, FontFileLoader fontFileLoader)
{
factory.CreateCustomFontFileReference(fontFileReferenceKey, fontFileReferenceKeySize, fontFileLoader, this);
}
