Wrap SkStreams in IStreams instead of copying data around.

http://codereview.appspot.com/4630062/


git-svn-id: http://skia.googlecode.com/svn/trunk@1694 2bbb7eff-a529-9590-31e7-b0007b416f81

2 files changed, 297 insertions, 0 deletions

diff --git a/src/utils/win/SkAutoCoInitialize.cpp b/src/utils/win/SkAutoCoInitialize.cpp
new file mode 100644
index 0000000000..7249341993
--- /dev/null
+++ b/src/utils/win/SkAutoCoInitialize.cpp
@@ -0,0 +1,34 @@
+/*
+    Copyright 2011 Google Inc.
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+ */
+
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+#include <ole2.h>
+#include "SkAutoCoInitialize.h"
+
+AutoCoInitialize::AutoCoInitialize() :
+    fHR(
+        CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE)
+    )
+{ }
+
+AutoCoInitialize::~AutoCoInitialize() {
+    if (SUCCEEDED(this->fHR)) {
+        CoUninitialize();
+    }
+}
+
+HRESULT AutoCoInitialize::getHR() { return this->fHR; }
diff --git a/src/utils/win/SkIStream.cpp b/src/utils/win/SkIStream.cpp
new file mode 100644
index 0000000000..29e1c87d53
--- /dev/null
+++ b/src/utils/win/SkIStream.cpp
@@ -0,0 +1,263 @@
+/*
+    Copyright 2011 Google Inc.
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+ */
+
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+#include <ole2.h>
+#include "SkIStream.h"
+#include "SkStream.h"
+
+/**
+ * SkBaseIStream
+ */
+SkBaseIStream::SkBaseIStream() : _refcount(1) { }
+SkBaseIStream::~SkBaseIStream() { }
+
+HRESULT STDMETHODCALLTYPE SkBaseIStream::QueryInterface(REFIID iid
+                                                      , void ** ppvObject)
+{
+    if (NULL == ppvObject) {
+        return E_INVALIDARG;
+    }
+    if (iid == __uuidof(IUnknown)
+        || iid == __uuidof(IStream)
+        || iid == __uuidof(ISequentialStream))
+    {
+        *ppvObject = static_cast<IStream*>(this);
+        AddRef();
+        return S_OK;
+    } else {
+        *ppvObject = NULL;
+        return E_NOINTERFACE; 
+    }
+}
+
+ULONG STDMETHODCALLTYPE SkBaseIStream::AddRef(void) {
+    return (ULONG)InterlockedIncrement(&_refcount);
+}
+
+ULONG STDMETHODCALLTYPE SkBaseIStream::Release(void) {
+    ULONG res = (ULONG) InterlockedDecrement(&_refcount);
+    if (0 == res) {
+        delete this;
+    }
+    return res;
+}
+
+// ISequentialStream Interface
+HRESULT STDMETHODCALLTYPE SkBaseIStream::Read(void* pv
+                                            , ULONG cb
+                                            , ULONG* pcbRead)
+{ return E_NOTIMPL; }
+
+HRESULT STDMETHODCALLTYPE SkBaseIStream::Write(void const* pv
+                                             , ULONG cb
+                                             , ULONG* pcbWritten)
+{ return E_NOTIMPL; }
+
+// IStream Interface
+HRESULT STDMETHODCALLTYPE SkBaseIStream::SetSize(ULARGE_INTEGER) 
+{ return E_NOTIMPL; }
+
+HRESULT STDMETHODCALLTYPE SkBaseIStream::CopyTo(IStream*
+                                              , ULARGE_INTEGER
+                                              , ULARGE_INTEGER*
+                                              , ULARGE_INTEGER*)
+{ return E_NOTIMPL; }
+
+HRESULT STDMETHODCALLTYPE SkBaseIStream::Commit(DWORD)
+{ return E_NOTIMPL; }
+
+HRESULT STDMETHODCALLTYPE SkBaseIStream::Revert(void)
+{ return E_NOTIMPL; }
+
+HRESULT STDMETHODCALLTYPE SkBaseIStream::LockRegion(ULARGE_INTEGER
+                                                  , ULARGE_INTEGER
+                                                  , DWORD)
+{ return E_NOTIMPL; }
+
+HRESULT STDMETHODCALLTYPE SkBaseIStream::UnlockRegion(ULARGE_INTEGER
+                                                    , ULARGE_INTEGER
+                                                    , DWORD)
+{ return E_NOTIMPL; }
+
+HRESULT STDMETHODCALLTYPE SkBaseIStream::Clone(IStream **)
+{ return E_NOTIMPL; }
+
+HRESULT STDMETHODCALLTYPE SkBaseIStream::Seek(LARGE_INTEGER liDistanceToMove
+                                            , DWORD dwOrigin
+                                            , ULARGE_INTEGER* lpNewFilePointer)
+{ return E_NOTIMPL; }
+
+HRESULT STDMETHODCALLTYPE SkBaseIStream::Stat(STATSTG* pStatstg
+                                            , DWORD grfStatFlag)
+{ return E_NOTIMPL; }
+
+
+/**
+ * SkIStream
+ */
+SkIStream::SkIStream(SkStream* stream, bool unrefOnRelease)
+    : SkBaseIStream()
+    , fSkStream(stream)
+    , fUnrefOnRelease(unrefOnRelease)
+{ }
+
+SkIStream::~SkIStream() {
+    if (NULL != this->fSkStream && fUnrefOnRelease) {
+        this->fSkStream->unref();
+    }
+}
+
+HRESULT SkIStream::CreateFromSkStream(SkStream* stream
+                                    , bool unrefOnRelease
+                                    , IStream ** ppStream)
+{
+    *ppStream = new SkIStream(stream, unrefOnRelease);
+    return S_OK;
+}
+
+// ISequentialStream Interface
+HRESULT STDMETHODCALLTYPE SkIStream::Read(void* pv, ULONG cb, ULONG* pcbRead) {
+    *pcbRead = this->fSkStream->read(pv, cb);
+    return (*pcbRead == cb) ? S_OK : S_FALSE;
+}
+
+HRESULT STDMETHODCALLTYPE SkIStream::Write(void const* pv
+                                         , ULONG cb
+                                         , ULONG* pcbWritten)
+{
+    return STG_E_CANTSAVE;
+}
+
+// IStream Interface
+HRESULT STDMETHODCALLTYPE SkIStream::Seek(LARGE_INTEGER liDistanceToMove
+                                        , DWORD dwOrigin
+                                        , ULARGE_INTEGER* lpNewFilePointer)
+{
+    if (lpNewFilePointer != NULL) {
+        (*lpNewFilePointer).QuadPart = NULL;
+    }
+        
+    HRESULT hr = S_OK;
+    switch(dwOrigin) {
+    case STREAM_SEEK_SET: {
+        if (!this->fSkStream->rewind()) {
+            hr = E_FAIL;
+        } else {
+            size_t skipped = this->fSkStream->skip(
+                liDistanceToMove.QuadPart
+            );
+            if (skipped != liDistanceToMove.QuadPart) {
+                hr = E_FAIL;
+            }
+        }
+        break;
+    }
+    case STREAM_SEEK_CUR: {
+        size_t skipped = this->fSkStream->skip(liDistanceToMove.QuadPart);
+        if (skipped != liDistanceToMove.QuadPart) {
+            hr = E_FAIL;
+        }
+        break;
+    }
+    case STREAM_SEEK_END: {
+        if (!this->fSkStream->rewind()) {
+            hr = E_FAIL;
+        } else {
+            size_t skipped = this->fSkStream->skip(
+                this->fSkStream->getLength() + liDistanceToMove.QuadPart
+            );
+            if (skipped != liDistanceToMove.QuadPart) {
+                hr = E_FAIL;
+            }
+        }
+        break;
+    }
+    default:
+        hr = STG_E_INVALIDFUNCTION;
+        break;
+    }
+    
+    return hr;
+}
+
+HRESULT STDMETHODCALLTYPE SkIStream::Stat(STATSTG* pStatstg
+                                        , DWORD grfStatFlag)
+{
+    if (0 == grfStatFlag & STATFLAG_NONAME) {
+        return STG_E_INVALIDFLAG;
+    }
+    pStatstg->pwcsName = NULL;
+    pStatstg->cbSize.QuadPart = this->fSkStream->getLength();
+    pStatstg->clsid = CLSID_NULL;
+    pStatstg->type = STGTY_STREAM;
+    pStatstg->grfMode = STGM_READ;
+    return S_OK;
+}
+
+
+/**
+ * SkIWStream
+ */
+SkWIStream::SkWIStream(SkWStream* stream)
+    : SkBaseIStream()
+    , fSkWStream(stream)
+{ }
+
+SkWIStream::~SkWIStream() {
+    if (NULL != this->fSkWStream) {
+        this->fSkWStream->flush();
+    }
+}
+
+HRESULT SkWIStream::CreateFromSkWStream(SkWStream* stream
+                                      , IStream ** ppStream)
+{
+    *ppStream = new SkWIStream(stream);
+    return S_OK;
+}
+
+// ISequentialStream Interface
+HRESULT STDMETHODCALLTYPE SkWIStream::Write(void const* pv
+                                          , ULONG cb
+                                          , ULONG* pcbWritten)
+{
+    HRESULT hr = S_OK;
+    bool wrote = this->fSkWStream->write(pv, cb);
+    if (wrote) {
+        *pcbWritten = cb;
+    } else {
+        *pcbWritten = 0;
+        hr = S_FALSE;
+    }
+    return hr;
+}
+
+// IStream Interface
+HRESULT STDMETHODCALLTYPE SkWIStream::Stat(STATSTG* pStatstg
+                                         , DWORD grfStatFlag)
+{
+    if (0 == grfStatFlag & STATFLAG_NONAME) {
+        return STG_E_INVALIDFLAG;
+    }
+    pStatstg->pwcsName = NULL;
+    pStatstg->cbSize.QuadPart = 0;
+    pStatstg->clsid = CLSID_NULL;
+    pStatstg->type = STGTY_STREAM;
+    pStatstg->grfMode = STGM_WRITE;
+    return S_OK;
+}