public HRESULT GetCurrentFontFile(out IDWriteFontFile fontFile)
{
DWriteFontFile file;
try
{
file = _enumerator.Current;
}
catch (Exception e)
{
ComError.SetError(e.GetAllMessages());
fontFile = null;
return(HRESULTS.DISP_E_EXCEPTION);
}
if (file is DWriteFontStreamFile sf && sf.FilePath != null)
{
using (var mem = new ComMemory(Marshal.SizeOf <long>()))
{
if (sf.LastWriteTime.HasValue)
{
Marshal.WriteInt64(mem.Pointer, sf.LastWriteTime.Value.ToFileTime());
}
var ptr = sf.LastWriteTime.HasValue ? mem.Pointer : IntPtr.Zero;
return(_factory.CreateFontFileReference(sf.FilePath, ptr, out fontFile));
}
}
var stream = new FontFileStream(file);
_loader.AddStream(stream);
return(_factory.CreateCustomFontFileReference(stream.Key, (uint)stream.KeySize, _loader, out fontFile));
}
public HRESULT MoveNext(out bool hasCurrentFile)
{
try
{
hasCurrentFile = _enumerator.MoveNext();
return(HRESULTS.S_OK);
}
catch (Exception e)
{
ComError.SetError(e.GetAllMessages());
hasCurrentFile = false;
return(HRESULTS.DISP_E_EXCEPTION);
}
}
HRESULT IDWriteFontCollectionLoader.CreateEnumeratorFromKey(IDWriteFactory factory, IntPtr collectionKey, uint collectionKeySize, out IDWriteFontFileEnumerator fontFileEnumerator)
{
var func = EnumerableFunc;
if (func == null)
{
fontFileEnumerator = null;
ComError.SetError(nameof(EnumerableFunc) + " was not set.");
return(HRESULTS.DISP_E_EXCEPTION);
}
byte[] key;
if (collectionKey == IntPtr.Zero || collectionKeySize == 0)
{
key = null;
}
else
{
key = new byte[collectionKeySize];
Marshal.Copy(collectionKey, key, 0, (int)collectionKeySize);
}
var enumerable = func(factory, key);
if (enumerable == null)
{
fontFileEnumerator = null;
ComError.SetError(nameof(EnumerableFunc) + " returned nothing.");
return(HRESULTS.DISP_E_EXCEPTION);
}
var enumerator = enumerable.GetEnumerator();
if (enumerator == null)
{
fontFileEnumerator = null;
ComError.SetError(nameof(EnumerableFunc) + " returned a null enumerator.");
return(HRESULTS.DISP_E_EXCEPTION);
}
fontFileEnumerator = new FontFileEnumerator(factory, _loader, enumerator);
return(HRESULTS.S_OK);
}
HRESULT IDWriteFontFileStream.ReadFileFragment(out IntPtr fragmentStart, ulong fileOffset, ulong fragmentSize, out IntPtr fragmentContext)
{
fragmentStart = IntPtr.Zero;
fragmentContext = IntPtr.Zero;
var bytes = _file.ReadFileFragment((long)fileOffset, (int)fragmentSize, out var read);
if (bytes.IsEmpty() || read == 0)
{
return(HRESULTS.E_FAIL);
}
if (read < 0 || read > bytes.Length)
{
ComError.SetError("Invalid ReadFileFragment implementation.");
return(HRESULTS.DISP_E_EXCEPTION);
}
fragmentContext = Marshal.AllocHGlobal(read);
fragmentStart = fragmentContext;
Marshal.Copy(bytes, 0, fragmentContext, read);
return(HRESULTS.S_OK);
}