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Diffstat (limited to '')
| -rw-r--r-- | gfx/thebes/gfxDWriteCommon.cpp | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/gfx/thebes/gfxDWriteCommon.cpp b/gfx/thebes/gfxDWriteCommon.cpp new file mode 100644 index 0000000000..ee81f15680 --- /dev/null +++ b/gfx/thebes/gfxDWriteCommon.cpp @@ -0,0 +1,204 @@ +/* -*- 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; +} |