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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "gfxDWriteCommon.h"
#include <unordered_map>
#include "mozilla/Atomics.h"
#include "mozilla/StaticMutex.h"
#include "mozilla/gfx/Logging.h"
class gfxDWriteFontFileStream;
static mozilla::StaticMutex sFontFileStreamsMutex MOZ_UNANNOTATED;
static uint64_t sNextFontFileKey = 0;
static std::unordered_map<uint64_t, gfxDWriteFontFileStream*> sFontFileStreams;
IDWriteFontFileLoader* gfxDWriteFontFileLoader::mInstance = nullptr;
class gfxDWriteFontFileStream final : public IDWriteFontFileStream {
public:
/**
* Used by the FontFileLoader to create a new font stream,
* this font stream is created from data in memory. The memory
* passed may be released after object creation, it will be
* copied internally.
*
* @param aData Font data
*/
gfxDWriteFontFileStream(const uint8_t* aData, uint32_t aLength,
uint64_t aFontFileKey);
~gfxDWriteFontFileStream();
// IUnknown interface
IFACEMETHOD(QueryInterface)(IID const& iid, OUT void** ppObject) {
if (iid == __uuidof(IDWriteFontFileStream)) {
*ppObject = static_cast<IDWriteFontFileStream*>(this);
return S_OK;
} else if (iid == __uuidof(IUnknown)) {
*ppObject = static_cast<IUnknown*>(this);
return S_OK;
} else {
return E_NOINTERFACE;
}
}
IFACEMETHOD_(ULONG, AddRef)() {
MOZ_ASSERT(int32_t(mRefCnt) >= 0, "illegal refcnt");
return ++mRefCnt;
}
IFACEMETHOD_(ULONG, Release)() {
MOZ_ASSERT(0 != mRefCnt, "dup release");
uint32_t count = --mRefCnt;
if (count == 0) {
// Avoid locking unless necessary. Verify the refcount hasn't changed
// while locked. Delete within the scope of the lock when zero.
mozilla::StaticMutexAutoLock lock(sFontFileStreamsMutex);
if (0 != mRefCnt) {
return mRefCnt;
}
delete this;
}
return count;
}
// IDWriteFontFileStream methods
virtual HRESULT STDMETHODCALLTYPE
ReadFileFragment(void const** fragmentStart, UINT64 fileOffset,
UINT64 fragmentSize, OUT void** fragmentContext);
virtual void STDMETHODCALLTYPE ReleaseFileFragment(void* fragmentContext);
virtual HRESULT STDMETHODCALLTYPE GetFileSize(OUT UINT64* fileSize);
virtual HRESULT STDMETHODCALLTYPE GetLastWriteTime(OUT UINT64* lastWriteTime);
size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
return mData.ShallowSizeOfExcludingThis(mallocSizeOf);
}
size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
return mallocSizeOf(this) + SizeOfExcludingThis(mallocSizeOf);
}
private:
FallibleTArray<uint8_t> mData;
mozilla::Atomic<uint32_t> mRefCnt;
uint64_t mFontFileKey;
};
gfxDWriteFontFileStream::gfxDWriteFontFileStream(const uint8_t* aData,
uint32_t aLength,
uint64_t aFontFileKey)
: mFontFileKey(aFontFileKey) {
// If this fails, mData will remain empty. That's OK: GetFileSize()
// will then return 0, etc., and the font just won't load.
if (!mData.AppendElements(aData, aLength, mozilla::fallible_t())) {
NS_WARNING("Failed to store data in gfxDWriteFontFileStream");
}
}
gfxDWriteFontFileStream::~gfxDWriteFontFileStream() {
sFontFileStreams.erase(mFontFileKey);
}
HRESULT STDMETHODCALLTYPE
gfxDWriteFontFileStream::GetFileSize(UINT64* fileSize) {
*fileSize = mData.Length();
return S_OK;
}
HRESULT STDMETHODCALLTYPE
gfxDWriteFontFileStream::GetLastWriteTime(UINT64* lastWriteTime) {
return E_NOTIMPL;
}
HRESULT STDMETHODCALLTYPE gfxDWriteFontFileStream::ReadFileFragment(
const void** fragmentStart, UINT64 fileOffset, UINT64 fragmentSize,
void** fragmentContext) {
// We are required to do bounds checking.
if (fileOffset + fragmentSize > (UINT64)mData.Length()) {
return E_FAIL;
}
// We should be alive for the duration of this.
*fragmentStart = &mData[fileOffset];
*fragmentContext = nullptr;
return S_OK;
}
void STDMETHODCALLTYPE
gfxDWriteFontFileStream::ReleaseFileFragment(void* fragmentContext) {}
HRESULT STDMETHODCALLTYPE gfxDWriteFontFileLoader::CreateStreamFromKey(
const void* fontFileReferenceKey, UINT32 fontFileReferenceKeySize,
IDWriteFontFileStream** fontFileStream) {
if (!fontFileReferenceKey || !fontFileStream) {
return E_POINTER;
}
mozilla::StaticMutexAutoLock lock(sFontFileStreamsMutex);
uint64_t fontFileKey = *static_cast<const uint64_t*>(fontFileReferenceKey);
auto found = sFontFileStreams.find(fontFileKey);
if (found == sFontFileStreams.end()) {
*fontFileStream = nullptr;
return E_FAIL;
}
found->second->AddRef();
*fontFileStream = found->second;
return S_OK;
}
/* static */
HRESULT
gfxDWriteFontFileLoader::CreateCustomFontFile(
const uint8_t* aFontData, uint32_t aLength, IDWriteFontFile** aFontFile,
IDWriteFontFileStream** aFontFileStream) {
MOZ_ASSERT(aFontFile);
MOZ_ASSERT(aFontFileStream);
RefPtr<IDWriteFactory> factory = mozilla::gfx::Factory::GetDWriteFactory();
if (!factory) {
gfxCriticalError()
<< "Failed to get DWrite Factory in CreateCustomFontFile.";
return E_FAIL;
}
sFontFileStreamsMutex.Lock();
uint64_t fontFileKey = sNextFontFileKey++;
RefPtr<gfxDWriteFontFileStream> ffsRef =
new gfxDWriteFontFileStream(aFontData, aLength, fontFileKey);
sFontFileStreams[fontFileKey] = ffsRef;
sFontFileStreamsMutex.Unlock();
RefPtr<IDWriteFontFile> fontFile;
HRESULT hr = factory->CreateCustomFontFileReference(
&fontFileKey, sizeof(fontFileKey), Instance(), getter_AddRefs(fontFile));
if (FAILED(hr)) {
NS_WARNING("Failed to load font file from data!");
return hr;
}
fontFile.forget(aFontFile);
ffsRef.forget(aFontFileStream);
return S_OK;
}
size_t gfxDWriteFontFileLoader::SizeOfIncludingThis(
mozilla::MallocSizeOf mallocSizeOf) const {
size_t sizes = mallocSizeOf(this);
// We are a singleton type that is effective owner of sFontFileStreams.
MOZ_ASSERT(this == mInstance);
for (const auto& entry : sFontFileStreams) {
gfxDWriteFontFileStream* fileStream = entry.second;
sizes += fileStream->SizeOfIncludingThis(mallocSizeOf);
}
return sizes;
}
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