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