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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.
*/
#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 {
SkAutoTDelete<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(SkStreamAsset* stream,
SkDWriteFontFileStreamWrapper** streamFontFileStream)
{
*streamFontFileStream = new SkDWriteFontFileStreamWrapper(stream);
if (NULL == streamFontFileStream) {
return E_OUTOFMEMORY;
}
return S_OK;
}
SkDWriteFontFileStreamWrapper::SkDWriteFontFileStreamWrapper(SkStreamAsset* stream)
: fRefCount(1), fStream(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 (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->seek(static_cast<size_t>(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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