chrome/app/chrome_exe_main_win.cc

   1 // Copyright (c) 2011 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 <windows.h>
   6 #include <tchar.h>
   7
   8 #include <string>
   9
  10 #include "base/at_exit.h"
  11 #include "base/command_line.h"
  12 #include "base/files/file_path.h"
  13 #include "base/logging.h"
  14 #include "base/win/windows_version.h"
  15 #include "chrome/app/client_util.h"
  16 #include "chrome/browser/chrome_process_finder_win.h"
  17 #include "chrome/browser/policy/policy_path_parser.h"
  18 #include "chrome/common/chrome_constants.h"
  19 #include "chrome/common/chrome_paths_internal.h"
  20 #include "chrome/common/chrome_switches.h"
  21 #include "chrome_elf/chrome_elf_main.h"
  22 #include "components/startup_metric_utils/startup_metric_utils.h"
  23 #include "content/public/common/result_codes.h"
  24 #include "ui/gfx/win/dpi.h"
  25
  26 namespace {
  27
  28 void CheckSafeModeLaunch() {
  29   unsigned short k1 = ::GetAsyncKeyState(VK_CONTROL);
  30   unsigned short k2 = ::GetAsyncKeyState(VK_MENU);
  31   const unsigned short kPressedMask = 0x8000;
  32   if ((k1 & kPressedMask) && (k2 & kPressedMask))
  33     ::SetEnvironmentVariableA(chrome::kSafeModeEnvVar, "1");
  34 }
  35
  36 // List of switches that it's safe to rendezvous early with. Fast start should
  37 // not be done if a command line contains a switch not in this set.
  38 // Note this is currently stored as a list of two because it's probably faster
  39 // to iterate over this small array than building a map for constant time
  40 // lookups.
  41 const char* const kFastStartSwitches[] = {
  42   switches::kProfileDirectory,
  43   switches::kShowAppList,
  44 };
  45
  46 bool IsFastStartSwitch(const std::string& command_line_switch) {
  47   for (size_t i = 0; i < arraysize(kFastStartSwitches); ++i) {
  48     if (command_line_switch == kFastStartSwitches[i])
  49       return true;
  50   }
  51   return false;
  52 }
  53
  54 bool ContainsNonFastStartFlag(const CommandLine& command_line) {
  55   const CommandLine::SwitchMap& switches = command_line.GetSwitches();
  56   if (switches.size() > arraysize(kFastStartSwitches))
  57     return true;
  58   for (CommandLine::SwitchMap::const_iterator it = switches.begin();
  59        it != switches.end(); ++it) {
  60     if (!IsFastStartSwitch(it->first))
  61       return true;
  62   }
  63   return false;
  64 }
  65
  66 bool AttemptFastNotify(const CommandLine& command_line) {
  67   if (ContainsNonFastStartFlag(command_line))
  68     return false;
  69
  70   base::FilePath user_data_dir;
  71   if (!chrome::GetDefaultUserDataDirectory(&user_data_dir))
  72     return false;
  73   policy::path_parser::CheckUserDataDirPolicy(&user_data_dir);
  74
  75   HWND chrome = chrome::FindRunningChromeWindow(user_data_dir);
  76   if (!chrome)
  77     return false;
  78   return chrome::AttemptToNotifyRunningChrome(chrome, true) ==
  79       chrome::NOTIFY_SUCCESS;
  80 }
  81
  82 // Duplicated from Win8.1 SDK ShellScalingApi.h
  83 typedef enum PROCESS_DPI_AWARENESS {
  84     PROCESS_DPI_UNAWARE = 0,
  85     PROCESS_SYSTEM_DPI_AWARE = 1,
  86     PROCESS_PER_MONITOR_DPI_AWARE = 2
  87 } PROCESS_DPI_AWARENESS;
  88
  89 typedef enum MONITOR_DPI_TYPE {
  90     MDT_EFFECTIVE_DPI = 0,
  91     MDT_ANGULAR_DPI = 1,
  92     MDT_RAW_DPI = 2,
  93     MDT_DEFAULT = MDT_EFFECTIVE_DPI
  94 } MONITOR_DPI_TYPE;
  95
  96 // Win8.1 supports monitor-specific DPI scaling.
  97 bool SetProcessDpiAwarenessWrapper(PROCESS_DPI_AWARENESS value) {
  98   typedef HRESULT(WINAPI *SetProcessDpiAwarenessPtr)(PROCESS_DPI_AWARENESS);
  99   SetProcessDpiAwarenessPtr set_process_dpi_awareness_func =
 100       reinterpret_cast<SetProcessDpiAwarenessPtr>(
 101           GetProcAddress(GetModuleHandleA("user32.dll"),
 102                           "SetProcessDpiAwarenessInternal"));
 103   if (set_process_dpi_awareness_func) {
 104     HRESULT hr = set_process_dpi_awareness_func(value);
 105     if (SUCCEEDED(hr)) {
 106       VLOG(1) << "SetProcessDpiAwareness succeeded.";
 107       return true;
 108     } else if (hr == E_ACCESSDENIED) {
 109       LOG(ERROR) << "Access denied error from SetProcessDpiAwareness. "
 110           "Function called twice, or manifest was used.";
 111     }
 112   }
 113   return false;
 114 }
 115
 116 // This function works for Windows Vista through Win8. Win8.1 must use
 117 // SetProcessDpiAwareness[Wrapper]
 118 BOOL SetProcessDPIAwareWrapper() {
 119   typedef BOOL(WINAPI *SetProcessDPIAwarePtr)(VOID);
 120   SetProcessDPIAwarePtr set_process_dpi_aware_func =
 121       reinterpret_cast<SetProcessDPIAwarePtr>(
 122       GetProcAddress(GetModuleHandleA("user32.dll"),
 123                       "SetProcessDPIAware"));
 124   return set_process_dpi_aware_func &&
 125     set_process_dpi_aware_func();
 126 }
 127
 128
 129 void EnableHighDPISupport() {
 130   if (!SetProcessDpiAwarenessWrapper(PROCESS_SYSTEM_DPI_AWARE)) {
 131     SetProcessDPIAwareWrapper();
 132   }
 133 }
 134
 135 }  // namespace
 136
 137 #if !defined(ADDRESS_SANITIZER)
 138 int APIENTRY wWinMain(HINSTANCE instance, HINSTANCE prev, wchar_t*, int) {
 139 #else
 140 // The AddressSanitizer build should be a console program as it prints out stuff
 141 // on stderr.
 142 int main() {
 143   HINSTANCE instance = GetModuleHandle(NULL);
 144 #endif
 145   startup_metric_utils::RecordExeMainEntryTime();
 146
 147   // Signal Chrome Elf that Chrome has begun to start.
 148   SignalChromeElf();
 149
 150   // Initialize the commandline singleton from the environment.
 151   CommandLine::Init(0, NULL);
 152   // The exit manager is in charge of calling the dtors of singletons.
 153   base::AtExitManager exit_manager;
 154
 155   // We don't want to set DPI awareness on Vista because we don't support
 156   // DirectWrite there. GDI fonts are kerned very badly, so better to leave
 157   // DPI-unaware and at effective 1.0. See also ShouldUseDirectWrite().
 158   if (base::win::GetVersion() > base::win::VERSION_VISTA)
 159     EnableHighDPISupport();
 160
 161   if (AttemptFastNotify(*CommandLine::ForCurrentProcess()))
 162     return 0;
 163
 164   CheckSafeModeLaunch();
 165
 166   // Load and launch the chrome dll. *Everything* happens inside.
 167   MainDllLoader* loader = MakeMainDllLoader();
 168   int rc = loader->Launch(instance);
 169   loader->RelaunchChromeBrowserWithNewCommandLineIfNeeded();
 170   delete loader;
 171   return rc;
 172 }