1 files changed, 269 insertions, 0 deletions
diff --git a/gfx/2d/NativeFontResourceDWrite.cpp b/gfx/2d/NativeFontResourceDWrite.cpp
new file mode 100644
index 0000000000..e0b599fa76
--- /dev/null
+++ b/gfx/2d/NativeFontResourceDWrite.cpp
@@ -0,0 +1,269 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "NativeFontResourceDWrite.h"
+#include "UnscaledFontDWrite.h"
+
+#include <unordered_map>
+
+#include "Logging.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/StaticMutex.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+namespace gfx {
+
+static StaticMutex sFontFileStreamsMutex MOZ_UNANNOTATED;
+static uint64_t sNextFontFileKey = 0;
+static std::unordered_map<uint64_t, IDWriteFontFileStream*> sFontFileStreams;
+
+class DWriteFontFileLoader : public IDWriteFontFileLoader {
+ public:
+  DWriteFontFileLoader() {}
+
+  // IUnknown interface
+  IFACEMETHOD(QueryInterface)(IID const& iid, OUT void** ppObject) {
+    if (iid == __uuidof(IDWriteFontFileLoader)) {
+      *ppObject = static_cast<IDWriteFontFileLoader*>(this);
+      return S_OK;
+    } else if (iid == __uuidof(IUnknown)) {
+      *ppObject = static_cast<IUnknown*>(this);
+      return S_OK;
+    } else {
+      return E_NOINTERFACE;
+    }
+  }
+
+  IFACEMETHOD_(ULONG, AddRef)() { return 1; }
+
+  IFACEMETHOD_(ULONG, Release)() { return 1; }
+
+  // IDWriteFontFileLoader methods
+  /**
+   * Important! Note the key here has to be a uint64_t that will have been
+   * generated by incrementing sNextFontFileKey.
+   */
+  virtual HRESULT STDMETHODCALLTYPE CreateStreamFromKey(
+      void const* fontFileReferenceKey, UINT32 fontFileReferenceKeySize,
+      OUT IDWriteFontFileStream** fontFileStream);
+
+  /**
+   * Gets the singleton loader instance. Note that when using this font
+   * loader, the key must be a uint64_t that has been generated by incrementing
+   * sNextFontFileKey.
+   * Also note that this is _not_ threadsafe.
+   */
+  static IDWriteFontFileLoader* Instance() {
+    if (!mInstance) {
+      mInstance = new DWriteFontFileLoader();
+      Factory::GetDWriteFactory()->RegisterFontFileLoader(mInstance);
+    }
+    return mInstance;
+  }
+
+ private:
+  static IDWriteFontFileLoader* mInstance;
+};
+
+class DWriteFontFileStream final : public IDWriteFontFileStream {
+ public:
+  explicit DWriteFontFileStream(uint64_t aFontFileKey);
+
+  /**
+   * 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
+   */
+  bool Initialize(uint8_t* aData, uint32_t aSize);
+
+  // 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)() { return ++mRefCnt; }
+
+  IFACEMETHOD_(ULONG, 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.
+      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);
+
+ private:
+  nsTArray<uint8_t> mData;
+  Atomic<uint32_t> mRefCnt;
+  uint64_t mFontFileKey;
+
+  ~DWriteFontFileStream();
+};
+
+IDWriteFontFileLoader* DWriteFontFileLoader::mInstance = nullptr;
+
+HRESULT STDMETHODCALLTYPE DWriteFontFileLoader::CreateStreamFromKey(
+    const void* fontFileReferenceKey, UINT32 fontFileReferenceKeySize,
+    IDWriteFontFileStream** fontFileStream) {
+  if (!fontFileReferenceKey || !fontFileStream) {
+    return E_POINTER;
+  }
+
+  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;
+}
+
+DWriteFontFileStream::DWriteFontFileStream(uint64_t aFontFileKey)
+    : mRefCnt(0), mFontFileKey(aFontFileKey) {}
+
+DWriteFontFileStream::~DWriteFontFileStream() {
+  sFontFileStreams.erase(mFontFileKey);
+}
+
+bool DWriteFontFileStream::Initialize(uint8_t* aData, uint32_t aSize) {
+  if (!mData.SetLength(aSize, fallible)) {
+    return false;
+  }
+  memcpy(mData.Elements(), aData, aSize);
+  return true;
+}
+
+HRESULT STDMETHODCALLTYPE DWriteFontFileStream::GetFileSize(UINT64* fileSize) {
+  *fileSize = mData.Length();
+  return S_OK;
+}
+
+HRESULT STDMETHODCALLTYPE
+DWriteFontFileStream::GetLastWriteTime(UINT64* lastWriteTime) {
+  return E_NOTIMPL;
+}
+
+HRESULT STDMETHODCALLTYPE DWriteFontFileStream::ReadFileFragment(
+    const void** fragmentStart, UINT64 fileOffset, UINT64 fragmentSize,
+    void** fragmentContext) {
+  // We are required to do bounds checking.
+  if (fileOffset + fragmentSize > mData.Length()) {
+    return E_FAIL;
+  }
+
+  // truncate the 64 bit fileOffset to size_t sized index into mData
+  size_t index = static_cast<size_t>(fileOffset);
+
+  // We should be alive for the duration of this.
+  *fragmentStart = &mData[index];
+  *fragmentContext = nullptr;
+  return S_OK;
+}
+
+void STDMETHODCALLTYPE
+DWriteFontFileStream::ReleaseFileFragment(void* fragmentContext) {}
+
+/* static */
+already_AddRefed<NativeFontResourceDWrite> NativeFontResourceDWrite::Create(
+    uint8_t* aFontData, uint32_t aDataLength) {
+  RefPtr<IDWriteFactory> factory = Factory::GetDWriteFactory();
+  if (!factory) {
+    gfxWarning() << "Failed to get DWrite Factory.";
+    return nullptr;
+  }
+
+  sFontFileStreamsMutex.Lock();
+  uint64_t fontFileKey = sNextFontFileKey++;
+  RefPtr<DWriteFontFileStream> ffsRef = new DWriteFontFileStream(fontFileKey);
+  if (!ffsRef->Initialize(aFontData, aDataLength)) {
+    sFontFileStreamsMutex.Unlock();
+    gfxWarning() << "Failed to create DWriteFontFileStream.";
+    return nullptr;
+  }
+  sFontFileStreams[fontFileKey] = ffsRef;
+  sFontFileStreamsMutex.Unlock();
+
+  RefPtr<IDWriteFontFile> fontFile;
+  HRESULT hr = factory->CreateCustomFontFileReference(
+      &fontFileKey, sizeof(fontFileKey), DWriteFontFileLoader::Instance(),
+      getter_AddRefs(fontFile));
+  if (FAILED(hr)) {
+    gfxWarning() << "Failed to load font file from data!";
+    return nullptr;
+  }
+
+  BOOL isSupported;
+  DWRITE_FONT_FILE_TYPE fileType;
+  DWRITE_FONT_FACE_TYPE faceType;
+  UINT32 numberOfFaces;
+  hr = fontFile->Analyze(&isSupported, &fileType, &faceType, &numberOfFaces);
+  if (FAILED(hr) || !isSupported) {
+    gfxWarning() << "Font file is not supported.";
+    return nullptr;
+  }
+
+  RefPtr<NativeFontResourceDWrite> fontResource =
+      new NativeFontResourceDWrite(factory, fontFile.forget(), ffsRef.forget(),
+                                   faceType, numberOfFaces, aDataLength);
+  return fontResource.forget();
+}
+
+already_AddRefed<UnscaledFont> NativeFontResourceDWrite::CreateUnscaledFont(
+    uint32_t aIndex, const uint8_t* aInstanceData,
+    uint32_t aInstanceDataLength) {
+  if (aIndex >= mNumberOfFaces) {
+    gfxWarning() << "Font face index is too high for font resource.";
+    return nullptr;
+  }
+
+  IDWriteFontFile* fontFile = mFontFile;
+  RefPtr<IDWriteFontFace> fontFace;
+  if (FAILED(mFactory->CreateFontFace(mFaceType, 1, &fontFile, aIndex,
+                                      DWRITE_FONT_SIMULATIONS_NONE,
+                                      getter_AddRefs(fontFace)))) {
+    gfxWarning() << "Failed to create font face from font file data.";
+    return nullptr;
+  }
+
+  RefPtr<UnscaledFont> unscaledFont = new UnscaledFontDWrite(fontFace, nullptr);
+
+  return unscaledFont.forget();
+}
+
+}  // namespace gfx
+}  // namespace mozilla