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 "SkStream.h" 14 #include "SkTScopedComPtr.h" 15 16 #include <dwrite.h> 17 18 /** 19 * An SkStream backed by an IDWriteFontFileStream. 20 * This allows Skia code to read an IDWriteFontFileStream. 21 */ 22 class SkDWriteFontFileStream : public SkStream { 23 public: 24 explicit SkDWriteFontFileStream(IDWriteFontFileStream* fontFileStream); 25 virtual ~SkDWriteFontFileStream(); 26 27 virtual bool rewind() SK_OVERRIDE; 28 virtual size_t read(void* buffer, size_t size) SK_OVERRIDE; 29 virtual const void* getMemoryBase() SK_OVERRIDE; 30 31 private: 32 SkTScopedComPtr<IDWriteFontFileStream> fFontFileStream; 33 size_t fPos; 34 const void* fLockedMemory; 35 void* fFragmentLock; 36 }; 37 38 /** 39 * An IDWriteFontFileStream backed by an SkStream. 40 * This allows DirectWrite to read an SkStream. 41 */ 42 class SkDWriteFontFileStreamWrapper : public IDWriteFontFileStream { 43 public: 44 // IUnknown methods 45 virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, void** ppvObject); 46 virtual ULONG STDMETHODCALLTYPE AddRef(); 47 virtual ULONG STDMETHODCALLTYPE Release(); 48 49 // IDWriteFontFileStream methods 50 virtual HRESULT STDMETHODCALLTYPE ReadFileFragment( 51 void const** fragmentStart, 52 UINT64 fileOffset, 53 UINT64 fragmentSize, 54 void** fragmentContext); 55 56 virtual void STDMETHODCALLTYPE ReleaseFileFragment(void* fragmentContext); 57 virtual HRESULT STDMETHODCALLTYPE GetFileSize(UINT64* fileSize); 58 virtual HRESULT STDMETHODCALLTYPE GetLastWriteTime(UINT64* lastWriteTime); 59 60 static HRESULT Create(SkStream* stream, SkDWriteFontFileStreamWrapper** streamFontFileStream); 61 62 private: 63 explicit SkDWriteFontFileStreamWrapper(SkStream* stream); 64 65 ULONG fRefCount; 66 SkAutoTUnref<SkStream> fStream; 67 SkMutex fStreamMutex; 68 }; 69 #endif 70
