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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     ~SkDWriteFontFileStream() override;
     27 
     28     size_t read(void* buffer, size_t size) override;
     29     bool isAtEnd() const override;
     30     bool rewind() override;
     31     size_t getPosition() const override;
     32     bool seek(size_t position) override;
     33     bool move(long offset) override;
     34     size_t getLength() const override;
     35     const void* getMemoryBase() override;
     36 
     37     std::unique_ptr<SkDWriteFontFileStream> duplicate() const {
     38         return std::unique_ptr<SkDWriteFontFileStream>(this->onDuplicate());
     39     }
     40     std::unique_ptr<SkDWriteFontFileStream> fork() const {
     41         return std::unique_ptr<SkDWriteFontFileStream>(this->onFork());
     42     }
     43 
     44 private:
     45     SkDWriteFontFileStream* onDuplicate() const override;
     46     SkDWriteFontFileStream* onFork() const override;
     47 
     48     SkTScopedComPtr<IDWriteFontFileStream> fFontFileStream;
     49     size_t fPos;
     50     const void* fLockedMemory;
     51     void* fFragmentLock;
     52 };
     53 
     54 /**
     55  *  An IDWriteFontFileStream backed by an SkStream.
     56  *  This allows DirectWrite to read an SkStream.
     57  */
     58 class SkDWriteFontFileStreamWrapper : public IDWriteFontFileStream {
     59 public:
     60     // IUnknown methods
     61     virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, void** ppvObject);
     62     virtual ULONG STDMETHODCALLTYPE AddRef();
     63     virtual ULONG STDMETHODCALLTYPE Release();
     64 
     65     // IDWriteFontFileStream methods
     66     virtual HRESULT STDMETHODCALLTYPE ReadFileFragment(
     67         void const** fragmentStart,
     68         UINT64 fileOffset,
     69         UINT64 fragmentSize,
     70         void** fragmentContext);
     71 
     72     virtual void STDMETHODCALLTYPE ReleaseFileFragment(void* fragmentContext);
     73     virtual HRESULT STDMETHODCALLTYPE GetFileSize(UINT64* fileSize);
     74     virtual HRESULT STDMETHODCALLTYPE GetLastWriteTime(UINT64* lastWriteTime);
     75 
     76     static HRESULT Create(SkStreamAsset* stream,
     77                           SkDWriteFontFileStreamWrapper** streamFontFileStream);
     78 
     79 private:
     80     explicit SkDWriteFontFileStreamWrapper(SkStreamAsset* stream);
     81     virtual ~SkDWriteFontFileStreamWrapper() { }
     82 
     83     ULONG fRefCount;
     84     std::unique_ptr<SkStreamAsset> fStream;
     85     SkMutex fStreamMutex;
     86 };
     87 #endif
     88