content/public/renderer/render_font_warmup_win.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/public/renderer/render_font_warmup_win.h"
   6
   7 #include <dwrite.h>
   8
   9 #include "base/logging.h"
  10 #include "third_party/WebKit/public/web/win/WebFontRendering.h"
  11 #include "third_party/skia/include/core/SkPaint.h"
  12 #include "third_party/skia/include/ports/SkFontMgr.h"
  13 #include "third_party/skia/include/ports/SkTypeface_win.h"
  14
  15 namespace content {
  16
  17 namespace {
  18
  19 SkFontMgr* g_warmup_fontmgr = NULL;
  20
  21 // Windows-only DirectWrite support. These warm up the DirectWrite paths
  22 // before sandbox lock down to allow Skia access to the Font Manager service.
  23 void CreateDirectWriteFactory(IDWriteFactory** factory) {
  24   typedef decltype(DWriteCreateFactory)* DWriteCreateFactoryProc;
  25   DWriteCreateFactoryProc dwrite_create_factory_proc =
  26       reinterpret_cast<DWriteCreateFactoryProc>(
  27           GetProcAddress(LoadLibraryW(L"dwrite.dll"), "DWriteCreateFactory"));
  28   CHECK(dwrite_create_factory_proc);
  29   CHECK(SUCCEEDED(
  30       dwrite_create_factory_proc(DWRITE_FACTORY_TYPE_ISOLATED,
  31                                  __uuidof(IDWriteFactory),
  32                                  reinterpret_cast<IUnknown**>(factory))));
  33 }
  34
  35 }  // namespace
  36
  37 void DoPreSandboxWarmupForTypeface(SkTypeface* typeface) {
  38   SkPaint paint_warmup;
  39   paint_warmup.setTypeface(typeface);
  40   wchar_t glyph = L'S';
  41   paint_warmup.measureText(&glyph, 2);
  42 }
  43
  44 SkFontMgr* GetPreSandboxWarmupFontMgr() {
  45   if (!g_warmup_fontmgr) {
  46     IDWriteFactory* factory;
  47     CreateDirectWriteFactory(&factory);
  48     blink::WebFontRendering::setDirectWriteFactory(factory);
  49     g_warmup_fontmgr = SkFontMgr_New_DirectWrite(factory);
  50   }
  51   return g_warmup_fontmgr;
  52 }
  53
  54 }  // namespace content