Support sideloaded fonts via command line option for blink layout_tests

content/public/renderer/render_font_warmup_win.cc

+// Copyright 2014 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/public/renderer/render_font_warmup_win.h"
+
+#include <dwrite.h>
+
+#include "base/logging.h"
+#include "third_party/WebKit/public/web/win/WebFontRendering.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/ports/SkFontMgr.h"
+#include "third_party/skia/include/ports/SkTypeface_win.h"
+
+namespace content {
+
+namespace {
+
+SkFontMgr* g_warmup_fontmgr = NULL;
+
+// 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;
+  DWriteCreateFactoryProc dwrite_create_factory_proc =
+      reinterpret_cast<DWriteCreateFactoryProc>(
+          GetProcAddress(LoadLibraryW(L"dwrite.dll"), "DWriteCreateFactory"));
+  CHECK(dwrite_create_factory_proc);
+  CHECK(SUCCEEDED(
+      dwrite_create_factory_proc(DWRITE_FACTORY_TYPE_ISOLATED,
+                                 __uuidof(IDWriteFactory),
+                                 reinterpret_cast<IUnknown**>(factory))));
+}
+
+}  // namespace
+
+void DoPreSandboxWarmupForTypeface(SkTypeface* typeface) {
+  SkPaint paint_warmup;
+  paint_warmup.setTypeface(typeface);
+  wchar_t glyph = L'S';
+  paint_warmup.measureText(&glyph, 2);
+}
+
+SkFontMgr* GetPreSandboxWarmupFontMgr() {
+  if (!g_warmup_fontmgr) {
+    IDWriteFactory* factory;
+    CreateDirectWriteFactory(&factory);
+    blink::WebFontRendering::setDirectWriteFactory(factory);
+    g_warmup_fontmgr = SkFontMgr_New_DirectWrite(factory);
+  }
+  return g_warmup_fontmgr;
+}
+
+}  // namespace content