Revert of Remove font cache code

content/child/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/child/font_warmup_win.h"
 
 #include <dwrite.h>
 #include <stdint.h>
 #include <map>
 
 #include "base/debug/alias.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/numerics/safe_math.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/synchronization/lock.h"
 #include "base/sys_byteorder.h"
 #include "base/trace_event/trace_event.h"
 #include "base/win/iat_patch_function.h"
 #include "base/win/windows_version.h"
+#include "content/public/common/dwrite_font_platform_win.h"
 #include "ppapi/shared_impl/proxy_lock.h"
 #include "skia/ext/fontmgr_default_win.h"
 #include "skia/ext/refptr.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 {
 
 // The Skia font manager, used for the life of the process (leaked at the end).
 SkFontMgr* g_warmup_fontmgr = nullptr;
 
@@ skipping 51 matching lines @@
                                        DWORD flags,
                                        void* server_sid,
                                        void* message,
                                        DWORD* buffer_length,
                                        void* out_message_attributes,
                                        void* in_message_attributes,
                                        void* time_out) {
   return STATUS_ACCESS_DENIED;
 }
 
+// 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);
+  }
+
+  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))));
+}
+
 // Class to fake out a DC or a Font object. Maintains a reference to a
 // SkTypeFace to emulate the simple operation of a DC and Font.
 class FakeGdiObject : public base::RefCountedThreadSafe<FakeGdiObject> {
  public:
   FakeGdiObject(uint32_t magic, void* handle)
       : handle_(handle), magic_(magic) {}
 
   void set_typeface(const skia::RefPtr<SkTypeface>& typeface) {
     typeface_ = typeface;
   }
@@ skipping 297 matching lines @@
 
   patched = g_iat_patch_start_service.Patch(
       L"dwrite.dll", service_provider_dll, "StartServiceW", StartServiceWPatch);
   DCHECK(patched == 0);
 
   patched = g_iat_patch_nt_connect_port.Patch(
       L"dwrite.dll", "ntdll.dll", "NtAlpcConnectPort", NtALpcConnectPortPatch);
   DCHECK(patched == 0);
 }
 
+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);
+
+    g_warmup_fontmgr =
+        SkFontMgr_New_DirectWrite(factory, GetCustomFontCollection(factory));
+    blink::WebFontRendering::setSkiaFontManager(g_warmup_fontmgr);
+  }
+  return g_warmup_fontmgr;
+}
+
 GdiFontPatchData* PatchGdiFontEnumeration(const base::FilePath& path) {
-  if (!g_warmup_fontmgr)
+  if (ShouldUseDirectWriteFontProxyFieldTrial() && !g_warmup_fontmgr)
     g_warmup_fontmgr = SkFontMgr_New_DirectWrite();
+  // If not using the font proxy, we assume |g_warmup_fontmgr| is already
+  // initialized before this function is called.
   DCHECK(g_warmup_fontmgr);
   return new GdiFontPatchDataImpl(path);
 }
 
 size_t GetEmulatedGdiHandleCountForTesting() {
   return g_fake_gdi_object_factory.Get().GetObjectCount();
 }
 
 void ResetEmulatedGdiHandlesForTesting() {
   g_fake_gdi_object_factory.Get().ResetObjectHandles();
 }
 
 void SetPreSandboxWarmupFontMgrForTesting(SkFontMgr* fontmgr) {
   g_warmup_fontmgr = fontmgr;
 }
 
+void WarmupDirectWrite() {
+  TRACE_EVENT0("startup", "content::WarmupDirectWrite");
+
+  // The objects used here are intentionally not freed as we want the Skia
+  // code to use these objects after warmup.
+  SetDefaultSkiaFactory(GetPreSandboxWarmupFontMgr());
+
+  // We need to warm up *some* font for DirectWrite. Note that we don't use
+  // a monospace as would be nice in an attempt to avoid a small startup time
+  // regression, see http://crbug.com/463613.
+  skia::RefPtr<SkTypeface> hud_typeface = skia::AdoptRef(
+      GetPreSandboxWarmupFontMgr()->legacyCreateTypeface("Times New Roman", 0));
+  DoPreSandboxWarmupForTypeface(hud_typeface.get());
+}
+
 }  // namespace content