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