mozglue/misc/WindowsDpiInitialization.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "mozilla/WindowsDpiInitialization.h"
   6
   7 #include "mozilla/DynamicallyLinkedFunctionPtr.h"
   8 #include "mozilla/WindowsProcessMitigations.h"
   9 #include "mozilla/WindowsVersion.h"
  10
  11 #include <shellscalingapi.h>
  12 #include <windows.h>
  13
  14 namespace mozilla {
  15
  16 typedef HRESULT(WINAPI* SetProcessDpiAwarenessType)(PROCESS_DPI_AWARENESS);
  17 typedef BOOL(WINAPI* SetProcessDpiAwarenessContextType)(DPI_AWARENESS_CONTEXT);
  18
  19 WindowsDpiInitializationResult WindowsDpiInitialization() {
  20   // DPI Awareness can't be used in a Win32k Lockdown process, so there's
  21   // nothing to do
  22   if (IsWin32kLockedDown()) {
  23     return WindowsDpiInitializationResult::Success;
  24   }
  25
  26   // From MSDN:
  27   //  SetProcessDpiAwarenessContext() was added in the Win10 Anniversary Update
  28   //  SetProcessDpiAwareness() was added in Windows 8.1
  29   //  SetProcessDpiAware() was added in Windows Vista
  30   //
  31   //  DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 wasn't added later until
  32   //  the Creators Update, so if it fails we just fall back to
  33   //  DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE
  34   if (IsWin10AnniversaryUpdateOrLater()) {
  35     DynamicallyLinkedFunctionPtr<SetProcessDpiAwarenessContextType>
  36         setProcessDpiAwarenessContext(L"user32.dll",
  37                                       "SetProcessDpiAwarenessContext");
  38     if (!setProcessDpiAwarenessContext) {
  39       return WindowsDpiInitializationResult::
  40           FindSetProcessDpiAwarenessContextFailed;
  41     }
  42
  43     if (!setProcessDpiAwarenessContext(
  44             DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2) &&
  45         !setProcessDpiAwarenessContext(
  46             DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE)) {
  47       return WindowsDpiInitializationResult::
  48           SetProcessDpiAwarenessContextFailed;
  49     }
  50
  51     return WindowsDpiInitializationResult::Success;
  52   } else if (IsWin8Point1OrLater()) {
  53     DynamicallyLinkedFunctionPtr<SetProcessDpiAwarenessType>
  54         setProcessDpiAwareness(L"Shcore.dll", "SetProcessDpiAwareness");
  55     if (!setProcessDpiAwareness) {
  56       return WindowsDpiInitializationResult::FindSetProcessDpiAwarenessFailed;
  57     }
  58
  59     if (FAILED(setProcessDpiAwareness(PROCESS_PER_MONITOR_DPI_AWARE))) {
  60       return WindowsDpiInitializationResult::SetProcessDpiAwarenessFailed;
  61     }
  62
  63     return WindowsDpiInitializationResult::Success;
  64   } else {
  65     if (!SetProcessDPIAware()) {
  66       return WindowsDpiInitializationResult::SetProcessDPIAwareFailed;
  67     }
  68
  69     return WindowsDpiInitializationResult::Success;
  70   }
  71 }
  72
  73 }  // namespace mozilla