michael@0: /*
michael@0:  * Copyright 2012 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #ifndef SkDWriteFontFileStream_DEFINED
michael@0: #define SkDWriteFontFileStream_DEFINED
michael@0: 
michael@0: #include "SkTypes.h"
michael@0: 
michael@0: #include "SkStream.h"
michael@0: #include "SkTScopedComPtr.h"
michael@0: 
michael@0: #include <dwrite.h>
michael@0: 
michael@0: /**
michael@0:  *  An SkStream backed by an IDWriteFontFileStream.
michael@0:  *  This allows Skia code to read an IDWriteFontFileStream.
michael@0:  */
michael@0: class SkDWriteFontFileStream : public SkStreamMemory {
michael@0: public:
michael@0:     explicit SkDWriteFontFileStream(IDWriteFontFileStream* fontFileStream);
michael@0:     virtual ~SkDWriteFontFileStream();
michael@0: 
michael@0:     virtual size_t read(void* buffer, size_t size) SK_OVERRIDE;
michael@0:     virtual bool isAtEnd() const SK_OVERRIDE;
michael@0:     virtual bool rewind() SK_OVERRIDE;
michael@0:     virtual SkDWriteFontFileStream* duplicate() const SK_OVERRIDE;
michael@0:     virtual size_t getPosition() const SK_OVERRIDE;
michael@0:     virtual bool seek(size_t position) SK_OVERRIDE;
michael@0:     virtual bool move(long offset) SK_OVERRIDE;
michael@0:     virtual SkDWriteFontFileStream* fork() const SK_OVERRIDE;
michael@0:     virtual size_t getLength() const SK_OVERRIDE;
michael@0:     virtual const void* getMemoryBase() SK_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:     SkTScopedComPtr<IDWriteFontFileStream> fFontFileStream;
michael@0:     size_t fPos;
michael@0:     const void* fLockedMemory;
michael@0:     void* fFragmentLock;
michael@0: };
michael@0: 
michael@0: /**
michael@0:  *  An IDWriteFontFileStream backed by an SkStream.
michael@0:  *  This allows DirectWrite to read an SkStream.
michael@0:  */
michael@0: class SkDWriteFontFileStreamWrapper : public IDWriteFontFileStream {
michael@0: public:
michael@0:     // IUnknown methods
michael@0:     virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, void** ppvObject);
michael@0:     virtual ULONG STDMETHODCALLTYPE AddRef();
michael@0:     virtual ULONG STDMETHODCALLTYPE Release();
michael@0: 
michael@0:     // IDWriteFontFileStream methods
michael@0:     virtual HRESULT STDMETHODCALLTYPE ReadFileFragment(
michael@0:         void const** fragmentStart,
michael@0:         UINT64 fileOffset,
michael@0:         UINT64 fragmentSize,
michael@0:         void** fragmentContext);
michael@0: 
michael@0:     virtual void STDMETHODCALLTYPE ReleaseFileFragment(void* fragmentContext);
michael@0:     virtual HRESULT STDMETHODCALLTYPE GetFileSize(UINT64* fileSize);
michael@0:     virtual HRESULT STDMETHODCALLTYPE GetLastWriteTime(UINT64* lastWriteTime);
michael@0: 
michael@0:     static HRESULT Create(SkStream* stream, SkDWriteFontFileStreamWrapper** streamFontFileStream);
michael@0: 
michael@0: private:
michael@0:     explicit SkDWriteFontFileStreamWrapper(SkStream* stream);
michael@0: 
michael@0:     ULONG fRefCount;
michael@0:     SkAutoTUnref<SkStream> fStream;
michael@0:     SkMutex fStreamMutex;
michael@0: };
michael@0: #endif