The Tor Browser: gfx/skia/trunk/src/utils/win/SkDWriteFontFileStream.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/utils/win/SkDWriteFontFileStream.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/utils/win/SkDWriteFontFileStream.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkTypes.h"
 #include "SkDWriteFontFileStream.h"
 #include "SkHRESULT.h"
 #include "SkTemplates.h"
 #include "SkTFitsIn.h"
 #include "SkTScopedComPtr.h"
 #include <dwrite.h>
 ///////////////////////////////////////////////////////////////////////////////
 //  SkIDWriteFontFileStream
 SkDWriteFontFileStream::SkDWriteFontFileStream(IDWriteFontFileStream* fontFileStream)
     : fFontFileStream(SkRefComPtr(fontFileStream))
     , fPos(0)
     , fLockedMemory(NULL)
     , fFragmentLock(NULL) {
 }
 SkDWriteFontFileStream::~SkDWriteFontFileStream() {
     if (fFragmentLock) {
         fFontFileStream->ReleaseFileFragment(fFragmentLock);
     }
 }
 size_t SkDWriteFontFileStream::read(void* buffer, size_t size) {
     HRESULT hr = S_OK;
     if (NULL == buffer) {
         size_t fileSize = this->getLength();
         if (fPos + size > fileSize) {
             size_t skipped = fileSize - fPos;
             fPos = fileSize;
             return skipped;
         } else {
             fPos += size;
             return size;
         }
     }
     const void* start;
     void* fragmentLock;
     hr = fFontFileStream->ReadFileFragment(&start, fPos, size, &fragmentLock);
     if (SUCCEEDED(hr)) {
         memcpy(buffer, start, size);
         fFontFileStream->ReleaseFileFragment(fragmentLock);
         fPos += size;
         return size;
     }
     //The read may have failed because we asked for too much data.
     size_t fileSize = this->getLength();
     if (fPos + size <= fileSize) {
         //This means we were within bounds, but failed for some other reason.
         return 0;
     }
     size_t read = fileSize - fPos;
     hr = fFontFileStream->ReadFileFragment(&start, fPos, read, &fragmentLock);
     if (SUCCEEDED(hr)) {
         memcpy(buffer, start, read);
         fFontFileStream->ReleaseFileFragment(fragmentLock);
         fPos = fileSize;
         return read;
     }
     return 0;
 }
 bool SkDWriteFontFileStream::isAtEnd() const {
     return fPos == this->getLength();
 }
 bool SkDWriteFontFileStream::rewind() {
     fPos = 0;
     return true;
 }
 SkDWriteFontFileStream* SkDWriteFontFileStream::duplicate() const {
     return SkNEW_ARGS(SkDWriteFontFileStream, (fFontFileStream.get()));
 }
 size_t SkDWriteFontFileStream::getPosition() const {
     return fPos;
 }
 bool SkDWriteFontFileStream::seek(size_t position) {
     size_t length = this->getLength();
     fPos = (position > length) ? length : position;
     return true;
 }
 bool SkDWriteFontFileStream::move(long offset) {
     return seek(fPos + offset);
 }
 SkDWriteFontFileStream* SkDWriteFontFileStream::fork() const {
     SkAutoTUnref<SkDWriteFontFileStream> that(this->duplicate());
     that->seek(fPos);
     return that.detach();
 }
 size_t SkDWriteFontFileStream::getLength() const {
     HRESULT hr = S_OK;
     UINT64 realFileSize = 0;
     hr = fFontFileStream->GetFileSize(&realFileSize);
     if (!SkTFitsIn<size_t>(realFileSize)) {
         return 0;
     }
     return static_cast<size_t>(realFileSize);
 }
 const void* SkDWriteFontFileStream::getMemoryBase() {
     if (fLockedMemory) {
         return fLockedMemory;
     }
     UINT64 fileSize;
     HRNM(fFontFileStream->GetFileSize(&fileSize), "Could not get file size");
     HRNM(fFontFileStream->ReadFileFragment(&fLockedMemory, 0, fileSize, &fFragmentLock),
          "Could not lock file fragment.");
     return fLockedMemory;
 }
 ///////////////////////////////////////////////////////////////////////////////
 //  SkIDWriteFontFileStreamWrapper
 HRESULT SkDWriteFontFileStreamWrapper::Create(SkStream* stream, SkDWriteFontFileStreamWrapper** streamFontFileStream) {
     *streamFontFileStream = new SkDWriteFontFileStreamWrapper(stream);
     if (NULL == streamFontFileStream) {
         return E_OUTOFMEMORY;
     }
     return S_OK;
 }
 SkDWriteFontFileStreamWrapper::SkDWriteFontFileStreamWrapper(SkStream* stream)
     : fRefCount(1), fStream(SkRef(stream)) {
 }
 HRESULT STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::QueryInterface(REFIID iid, void** ppvObject) {
     if (iid == IID_IUnknown || iid == __uuidof(IDWriteFontFileStream)) {
         *ppvObject = this;
         AddRef();
         return S_OK;
     } else {
         *ppvObject = NULL;
         return E_NOINTERFACE;
     }
 }
 ULONG STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::AddRef() {
     return InterlockedIncrement(&fRefCount);
 }
 ULONG STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::Release() {
     ULONG newCount = InterlockedDecrement(&fRefCount);
     if (0 == newCount) {
         delete this;
     }
     return newCount;
 }
 HRESULT STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::ReadFileFragment(
     void const** fragmentStart,
     UINT64 fileOffset,
     UINT64 fragmentSize,
     void** fragmentContext)
 {
     // The loader is responsible for doing a bounds check.
     UINT64 fileSize;
     this->GetFileSize(&fileSize);
     if (fileOffset > fileSize || fragmentSize > fileSize - fileOffset) {
         *fragmentStart = NULL;
         *fragmentContext = NULL;
         return E_FAIL;
     }
     if (!SkTFitsIn<size_t>(fileOffset + fragmentSize)) {
         return E_FAIL;
     }
     const void* data = fStream->getMemoryBase();
     if (NULL != data) {
         *fragmentStart = static_cast<BYTE const*>(data) + static_cast<size_t>(fileOffset);
         *fragmentContext = NULL;
     } else {
         //May be called from multiple threads.
         SkAutoMutexAcquire ama(fStreamMutex);
         *fragmentStart = NULL;
         *fragmentContext = NULL;
         if (!fStream->rewind()) {
             return E_FAIL;
         }
         if (fStream->skip(static_cast<size_t>(fileOffset)) != fileOffset) {
             return E_FAIL;
         }
         SkAutoTMalloc<uint8_t> streamData(static_cast<size_t>(fragmentSize));
         if (fStream->read(streamData.get(), static_cast<size_t>(fragmentSize)) != fragmentSize) {
             return E_FAIL;
         }
         *fragmentStart = streamData.get();
         *fragmentContext = streamData.detach();
     }
     return S_OK;
 }
 void STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::ReleaseFileFragment(void* fragmentContext) {
     sk_free(fragmentContext);
 }
 HRESULT STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::GetFileSize(UINT64* fileSize) {
     *fileSize = fStream->getLength();
     return S_OK;
 }
 HRESULT STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::GetLastWriteTime(UINT64* lastWriteTime) {
     // The concept of last write time does not apply to this loader.
     *lastWriteTime = 0;
     return E_NOTIMPL;
 }

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gfx/skia/trunk/src/utils/win/SkDWriteFontFileStream.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/utils/win/SkDWriteFontFileStream.cpp