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..3092ba3e22
--- /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;
+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;
+}