content/browser/accessibility/browser_accessibility_state_impl_win.cc

   1 // Copyright (c) 2012 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/browser/accessibility/browser_accessibility_state_impl.h"
   6
   7 #include <windows.h>
   8 #include <psapi.h>
   9
  10 #include "base/files/file_path.h"
  11 #include "base/macros.h"
  12 #include "base/metrics/histogram.h"
  13 #include "base/strings/string_util.h"
  14
  15 namespace content {
  16
  17 void BrowserAccessibilityStateImpl::UpdatePlatformSpecificHistograms() {
  18   // NOTE: this method is run from the file thread to reduce jank, since
  19   // there's no guarantee these system calls will return quickly. Be careful
  20   // not to add any code that isn't safe to run from a non-main thread!
  21
  22   AUDIODESCRIPTION audio_description = {0};
  23   audio_description.cbSize = sizeof(AUDIODESCRIPTION);
  24   SystemParametersInfo(SPI_GETAUDIODESCRIPTION, 0, &audio_description, 0);
  25   UMA_HISTOGRAM_BOOLEAN("Accessibility.WinAudioDescription",
  26                         !!audio_description.Enabled);
  27
  28   BOOL win_screen_reader = FALSE;
  29   SystemParametersInfo(SPI_GETSCREENREADER, 0, &win_screen_reader, 0);
  30   UMA_HISTOGRAM_BOOLEAN("Accessibility.WinScreenReader",
  31                         !!win_screen_reader);
  32
  33   STICKYKEYS sticky_keys = {0};
  34   sticky_keys.cbSize = sizeof(STICKYKEYS);
  35   SystemParametersInfo(SPI_GETSTICKYKEYS, 0, &sticky_keys, 0);
  36   UMA_HISTOGRAM_BOOLEAN("Accessibility.WinStickyKeys",
  37                         0 != (sticky_keys.dwFlags & SKF_STICKYKEYSON));
  38
  39   // Get the file paths of all DLLs loaded.
  40   HANDLE process = GetCurrentProcess();
  41   HMODULE* modules = NULL;
  42   DWORD bytes_required;
  43   if (!EnumProcessModules(process, modules, 0, &bytes_required))
  44     return;
  45
  46   scoped_ptr<char[]> buffer(new char[bytes_required]);
  47   modules = reinterpret_cast<HMODULE*>(buffer.get());
  48   DWORD ignore;
  49   if (!EnumProcessModules(process, modules, bytes_required, &ignore))
  50     return;
  51
  52   // Look for DLLs of assistive technology known to work with Chrome.
  53   bool jaws = false;
  54   bool nvda = false;
  55   bool satogo = false;
  56   bool zoomtext = false;
  57   size_t module_count = bytes_required / sizeof(HMODULE);
  58   for (size_t i = 0; i < module_count; i++) {
  59     TCHAR filename[MAX_PATH];
  60     GetModuleFileName(modules[i], filename, arraysize(filename));
  61     base::string16 module_name(base::FilePath(filename).BaseName().value());
  62     if (LowerCaseEqualsASCII(module_name, "fsdomsrv.dll"))
  63       jaws = true;
  64     if (LowerCaseEqualsASCII(module_name, "vbufbackend_gecko_ia2.dll"))
  65       nvda = true;
  66     if (LowerCaseEqualsASCII(module_name, "stsaw32.dll"))
  67       satogo = true;
  68     if (LowerCaseEqualsASCII(module_name, "zslhook.dll"))
  69       zoomtext = true;
  70   }
  71
  72   UMA_HISTOGRAM_BOOLEAN("Accessibility.WinJAWS", jaws);
  73   UMA_HISTOGRAM_BOOLEAN("Accessibility.WinNVDA", nvda);
  74   UMA_HISTOGRAM_BOOLEAN("Accessibility.WinSAToGo", satogo);
  75   UMA_HISTOGRAM_BOOLEAN("Accessibility.WinZoomText", zoomtext);
  76 }
  77
  78 }  // namespace content