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30 ref class FontFileStream;
33 /// Font file loader interface handles loading font file resources of a particular type from a key.
34 /// The font file loader interface is recommended to be implemented by a singleton object.
35 /// IMPORTANT: font file loader implementations must not register themselves with DirectWrite factory
36 /// inside their constructors and must not unregister themselves in their destructors, because
37 /// registration and underregistration operations increment and decrement the object reference count respectively.
38 /// Instead, registration and underregistration of font file loaders with DirectWrite factory should be performed
39 /// outside of the font file loader implementation as a separate step.
41 public interface struct IFontFileLoader
44 /// Creates a font file stream object that encapsulates an open file resource.
45 /// The resource is closed when the last reference to fontFileStream is released.
47 /// <param name="fontFileReferenceKey">Font file reference key that uniquely identifies the font file resource
48 /// within the scope of the font loader being used.</param>
49 /// <param name="fontFileReferenceKeySize">Size of font file reference key in bytes.</param>
51 /// Reference to the newly created font file stream.
53 FontFileStream ^CreateStreamFromKey(IntPtr fontFileReferenceKey, int fontFileReferenceKeySize);
56 class IFontFileLoaderShim : public IDWriteFontFileLoader
59 static IFontFileLoaderShim *CreateInstance(IFontFileLoader ^loader);
61 STDMETHOD(QueryInterface)(REFIID riid, void **ppvObject);
62 STDMETHOD_(ULONG, AddRef)();
63 STDMETHOD_(ULONG, Release)();
65 STDMETHOD(CreateStreamFromKey)(void const *fontFileReferenceKey, UINT32 fontFileReferenceKeySize, IDWriteFontFileStream **fontFileStream);
68 IFontFileLoaderShim(IFontFileLoader ^wrappedInterface);
71 gcroot<IFontFileLoader ^> m_wrappedInterface;