components/html_viewer/global_state.cc

   1 // Copyright 2015 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 "components/html_viewer/global_state.h"
   6
   7 #include <string>
   8
   9 #include "base/bind.h"
  10 #include "base/command_line.h"
  11 #include "base/i18n/icu_util.h"
  12 #include "base/logging.h"
  13 #include "components/html_viewer/blink_platform_impl.h"
  14 #include "components/html_viewer/media_factory.h"
  15 #include "components/scheduler/renderer/renderer_scheduler.h"
  16 #include "gin/v8_initializer.h"
  17 #include "mojo/application/public/cpp/application_impl.h"
  18 #include "mojo/logging/init_logging.h"
  19 #include "third_party/WebKit/public/web/WebKit.h"
  20 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
  21 #include "ui/base/resource/resource_bundle.h"
  22 #include "ui/base/ui_base_paths.h"
  23 #include "ui/mojo/init/ui_init.h"
  24 #include "v8/include/v8.h"
  25
  26 #if defined(OS_LINUX) && !defined(OS_ANDROID)
  27 #include "components/font_service/public/cpp/font_loader.h"
  28 #endif
  29
  30 namespace html_viewer {
  31
  32 namespace {
  33
  34 // Disables support for (unprefixed) Encrypted Media Extensions.
  35 const char kDisableEncryptedMedia[] = "disable-encrypted-media";
  36
  37 // Prevents creation of any output surface.
  38 const char kIsHeadless[] = "is-headless";
  39
  40 // Specifies the flags passed to JS engine.
  41 const char kJavaScriptFlags[] = "js-flags";
  42
  43 size_t kDesiredMaxMemory = 20 * 1024 * 1024;
  44
  45 // Paths resources are loaded from.
  46 const char kResourceResourcesPak[] = "html_viewer.pak";
  47 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
  48 const char kResourceNativesBlob[] = "natives_blob.bin";
  49 const char kResourceSnapshotBlob[] = "snapshot_blob.bin";
  50 #endif
  51
  52 std::set<std::string> GetResourcePaths() {
  53   std::set<std::string> paths;
  54   paths.insert(kResourceResourcesPak);
  55 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
  56   paths.insert(kResourceNativesBlob);
  57   paths.insert(kResourceSnapshotBlob);
  58 #endif
  59   return paths;
  60 }
  61
  62 }  // namespace
  63
  64 GlobalState::GlobalState(mojo::ApplicationImpl* app)
  65     : app_(app),
  66       resource_loader_(app->shell(), GetResourcePaths()),
  67       is_headless_(
  68           base::CommandLine::ForCurrentProcess()->HasSwitch(kIsHeadless)),
  69       did_init_(false),
  70       device_pixel_ratio_(1.f),
  71       discardable_memory_allocator_(kDesiredMaxMemory),
  72       compositor_thread_("compositor thread") {
  73   if (is_headless_)
  74     InitIfNecessary(gfx::Size(1024, 1024), 1.f);
  75 }
  76
  77 GlobalState::~GlobalState() {
  78   if (blink_platform_) {
  79     renderer_scheduler_->Shutdown();
  80     blink::shutdown();
  81   }
  82 }
  83
  84 void GlobalState::InitIfNecessary(const gfx::Size& screen_size_in_pixels,
  85                                   float device_pixel_ratio) {
  86   if (did_init_)
  87     return;
  88
  89   DCHECK_NE(0.f, device_pixel_ratio);
  90
  91   did_init_ = true;
  92   device_pixel_ratio_ = device_pixel_ratio;
  93   screen_size_in_pixels_ = screen_size_in_pixels;
  94
  95   if (!resource_loader_.BlockUntilLoaded()) {
  96     // Assume on error we're being shut down.
  97     app_->Quit();
  98     return;
  99   }
 100
 101 #if defined(OS_LINUX) && !defined(OS_ANDROID)
 102   SkFontConfigInterface::SetGlobal(new font_service::FontLoader(app_));
 103 #endif
 104
 105   ui_init_.reset(
 106       new ui::mojo::UIInit(screen_size_in_pixels, device_pixel_ratio));
 107   base::DiscardableMemoryAllocator::SetInstance(&discardable_memory_allocator_);
 108
 109   renderer_scheduler_ = scheduler::RendererScheduler::Create();
 110   blink_platform_.reset(new BlinkPlatformImpl(app_, renderer_scheduler_.get()));
 111 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
 112   gin::V8Initializer::LoadV8SnapshotFromFD(
 113       resource_loader_.ReleaseFile(kResourceSnapshotBlob).TakePlatformFile(),
 114       0u, 0u);
 115   gin::V8Initializer::LoadV8NativesFromFD(
 116       resource_loader_.ReleaseFile(kResourceNativesBlob).TakePlatformFile(), 0u,
 117       0u);
 118 #endif
 119   blink::initialize(blink_platform_.get());
 120   base::i18n::InitializeICUWithFileDescriptor(
 121       resource_loader_.GetICUFile().TakePlatformFile(),
 122       base::MemoryMappedFile::Region::kWholeFile);
 123
 124   ui::RegisterPathProvider();
 125
 126   mojo::logging::InitLogging();
 127
 128   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 129
 130   if (command_line->HasSwitch(kDisableEncryptedMedia))
 131     blink::WebRuntimeFeatures::enableEncryptedMedia(false);
 132
 133   if (!is_headless_) {
 134     base::File pak_file = resource_loader_.ReleaseFile(kResourceResourcesPak);
 135     base::File pak_file_2 = pak_file.Duplicate();
 136     ui::ResourceBundle::InitSharedInstanceWithPakFileRegion(
 137         pak_file.Pass(), base::MemoryMappedFile::Region::kWholeFile);
 138     // TODO(sky): why is this always using 100?
 139     ui::ResourceBundle::GetSharedInstance().AddDataPackFromFile(
 140       pak_file_2.Pass(), ui::SCALE_FACTOR_100P);
 141   }
 142
 143   compositor_thread_.Start();
 144
 145   media_factory_.reset(
 146       new MediaFactory(compositor_thread_.task_runner(), app_->shell()));
 147
 148   if (command_line->HasSwitch(kJavaScriptFlags)) {
 149     std::string flags(command_line->GetSwitchValueASCII(kJavaScriptFlags));
 150     v8::V8::SetFlagsFromString(flags.c_str(), static_cast<int>(flags.size()));
 151   }
 152 }
 153
 154 }  // namespace html_viewer