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      1 /*
      2  * Copyright 2012 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef SkDWriteFontFileStream_DEFINED
      9 #define SkDWriteFontFileStream_DEFINED
     10 
     11 #include "SkTypes.h"
     12 
     13 #include "SkMutex.h"
     14 #include "SkStream.h"
     15 #include "SkTScopedComPtr.h"
     16 
     17 #include <dwrite.h>
     18 
     19 /**
     20  *  An SkStream backed by an IDWriteFontFileStream.
     21  *  This allows Skia code to read an IDWriteFontFileStream.
     22  */
     23 class SkDWriteFontFileStream : public SkStreamMemory {
     24 public:
     25     explicit SkDWriteFontFileStream(IDWriteFontFileStream* fontFileStream);
     26     virtual ~SkDWriteFontFileStream();
     27 
     28     size_t read(void* buffer, size_t size) override;
     29     bool isAtEnd() const override;
     30     bool rewind() override;
     31     SkDWriteFontFileStream* duplicate() const override;
     32     size_t getPosition() const override;
     33     bool seek(size_t position) override;
     34     bool move(long offset) override;
     35     SkDWriteFontFileStream* fork() const override;
     36     size_t getLength() const override;
     37     const void* getMemoryBase() override;
     38 
     39 private:
     40     SkTScopedComPtr<IDWriteFontFileStream> fFontFileStream;
     41     size_t fPos;
     42     const void* fLockedMemory;
     43     void* fFragmentLock;
     44 };
     45 
     46 /**
     47  *  An IDWriteFontFileStream backed by an SkStream.
     48  *  This allows DirectWrite to read an SkStream.
     49  */
     50 class SkDWriteFontFileStreamWrapper : public IDWriteFontFileStream {
     51 public:
     52     // IUnknown methods
     53     virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, void** ppvObject);
     54     virtual ULONG STDMETHODCALLTYPE AddRef();
     55     virtual ULONG STDMETHODCALLTYPE Release();
     56 
     57     // IDWriteFontFileStream methods
     58     virtual HRESULT STDMETHODCALLTYPE ReadFileFragment(
     59         void const** fragmentStart,
     60         UINT64 fileOffset,
     61         UINT64 fragmentSize,
     62         void** fragmentContext);
     63 
     64     virtual void STDMETHODCALLTYPE ReleaseFileFragment(void* fragmentContext);
     65     virtual HRESULT STDMETHODCALLTYPE GetFileSize(UINT64* fileSize);
     66     virtual HRESULT STDMETHODCALLTYPE GetLastWriteTime(UINT64* lastWriteTime);
     67 
     68     static HRESULT Create(SkStreamAsset* stream,
     69                           SkDWriteFontFileStreamWrapper** streamFontFileStream);
     70 
     71 private:
     72     explicit SkDWriteFontFileStreamWrapper(SkStreamAsset* stream);
     73     virtual ~SkDWriteFontFileStreamWrapper() { }
     74 
     75     ULONG fRefCount;
     76     SkAutoTDelete<SkStreamAsset> fStream;
     77     SkMutex fStreamMutex;
     78 };
     79 #endif
     80