Implementation of dwrite font proxy and removal of dwrite font cache

content/child/dwrite_font_proxy/dwrite_font_proxy_init_win.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/child/dwrite_font_proxy/dwrite_font_proxy_init_win.h"
+
+#include <dwrite.h>
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/debug/alias.h"
+#include "base/win/iat_patch_function.h"
+#include "base/win/windows_version.h"
+#include "content/child/dwrite_font_proxy/dwrite_font_proxy_win.h"
+#include "content/common/font_warmup_win.h"
+#include "skia/ext/fontmgr_default_win.h"
+#include "third_party/WebKit/public/web/win/WebFontRendering.h"
+#include "third_party/skia/include/ports/SkTypeface_win.h"
+
+namespace mswr = Microsoft::WRL;
+
+namespace content {
+
+namespace {
+mswr::ComPtr<DWriteFontCollectionProxy> g_font_collection;
+IPC::Sender* g_sender_override = nullptr;
+
+// Windows-only DirectWrite support. These warm up the DirectWrite paths
+// before sandbox lock down to allow Skia access to the Font Manager service.
+void CreateDirectWriteFactory(IDWriteFactory** factory) {
+  typedef decltype(DWriteCreateFactory)* DWriteCreateFactoryProc;
+  HMODULE dwrite_dll = LoadLibraryW(L"dwrite.dll");
+  // TODO(scottmg): Temporary code to track crash in http://crbug.com/387867.
+  if (!dwrite_dll) {
+    DWORD load_library_get_last_error = GetLastError();
+    base::debug::Alias(&dwrite_dll);
+    base::debug::Alias(&load_library_get_last_error);
+    CHECK(false);
+  }
+
+  // This shouldn't be necessary, but not having this causes breakage in
+  // content_browsertests, and possibly other high-stress cases.
+  PatchServiceManagerCalls();
+
+  DWriteCreateFactoryProc dwrite_create_factory_proc =
+      reinterpret_cast<DWriteCreateFactoryProc>(
+          GetProcAddress(dwrite_dll, "DWriteCreateFactory"));
+  // TODO(scottmg): Temporary code to track crash in http://crbug.com/387867.
+  if (!dwrite_create_factory_proc) {
+    DWORD get_proc_address_get_last_error = GetLastError();
+    base::debug::Alias(&dwrite_create_factory_proc);
+    base::debug::Alias(&get_proc_address_get_last_error);
+    CHECK(false);
+  }
+  CHECK(SUCCEEDED(dwrite_create_factory_proc(
+      DWRITE_FACTORY_TYPE_ISOLATED, __uuidof(IDWriteFactory),
+      reinterpret_cast<IUnknown**>(factory))));
+}
+
+HRESULT STDMETHODCALLTYPE StubFontCollection(IDWriteFactory* factory,
+                                             IDWriteFontCollection** col,
+                                             BOOL checkUpdates) {
+  DCHECK(g_font_collection != nullptr);
+  g_font_collection.CopyTo(col);
+  return S_OK;
+}
+
+// Copied from content/common/font_warmup_win.cc
+void PatchDWriteFactory(IDWriteFactory* factory) {
+  const unsigned int kGetSystemFontCollectionVTableIndex = 3;
+
+  PROC* vtable = *reinterpret_cast<PROC**>(factory);
+  PROC* function_ptr = &vtable[kGetSystemFontCollectionVTableIndex];
+  void* stub_function = &StubFontCollection;
+  base::win::ModifyCode(function_ptr, &stub_function, sizeof(PROC));
+}
+
+// Needed as a function for Bind()
+IPC::Sender* GetSenderOverride() {
+  return g_sender_override;
+}
+
+}  // namespace
+
+void InitializeDWriteFontProxy(
+    const base::Callback<IPC::Sender*(void)>& sender) {
+  mswr::ComPtr<IDWriteFactory> factory;
+
+  CreateDirectWriteFactory(&factory);
+
+  if (g_font_collection == nullptr) {
+    if (g_sender_override != nullptr) {
+      mswr::MakeAndInitialize<DWriteFontCollectionProxy>(
+          &g_font_collection, factory.Get(), base::Bind(&GetSenderOverride));
+    } else {
+      mswr::MakeAndInitialize<DWriteFontCollectionProxy>(&g_font_collection,
+                                                         factory.Get(), sender);
+    }
+  }
+
+  PatchDWriteFactory(factory.Get());
+
+  blink::WebFontRendering::setDirectWriteFactory(factory.Get());
+  SkFontMgr* skia_font_manager = SkFontMgr_New_DirectWrite(factory.Get());
+  SetDefaultSkiaFactory(skia_font_manager);
+}
+
+void UninitializeDWriteFontProxy() {
+  if (g_font_collection != nullptr)
+    g_font_collection->Unregister();
+}
+
+void SetDWriteFontProxySenderForTesting(IPC::Sender* sender) {
+  g_sender_override = sender;
+}
+
+}  // namespace content