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/child/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/SkFontMgr.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))));
}

}  // namespace

void InitializeDWriteFontProxy() {
  mswr::ComPtr<IDWriteFactory> factory;

  CreateDirectWriteFactory(&factory);

  if (!g_font_collection) {
    mswr::MakeAndInitialize<DWriteFontCollectionProxy>(
        &g_font_collection, factory.Get(), g_sender_override);
  }

  sk_sp<SkFontMgr> skia_font_manager(
      SkFontMgr_New_DirectWrite(factory.Get(), g_font_collection.Get()));
  blink::WebFontRendering::setSkiaFontManager(skia_font_manager.get());

  // Add an extra ref for SetDefaultSkiaFactory, which keeps a ref but doesn't
  // addref.
  skia_font_manager->ref();
  SetDefaultSkiaFactory(skia_font_manager.get());
}

void UninitializeDWriteFontProxy() {
  if (g_font_collection)
    g_font_collection->Unregister();
}

void SetDWriteFontProxySenderForTesting(IPC::Sender* sender) {
  g_sender_override = sender;
}

}  // namespace content