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