Screen.orientation lock API implementation for Windows8 and later.

content/browser/screen_orientation/screen_orientation_delegate_win.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/screen_orientation/screen_orientation_delegate_win.h"
+
+#include <windows.h>
+#include "content/public/browser/screen_orientation_provider.h"
+
+namespace content {
+
+ScreenOrientationDelegateWin::ScreenOrientationDelegateWin() {
+  content::ScreenOrientationProvider::SetDelegate(this);
+}
+
+ScreenOrientationDelegateWin::~ScreenOrientationDelegateWin() {
+  content::ScreenOrientationProvider::SetDelegate(nullptr);
+}
+
+bool ScreenOrientationDelegateWin::FullScreenRequired(
+    content::WebContents* web_contents) {
+  return false;
+}
+
+static void GetCurrentDisplaySettings(bool *landscape, bool *flipped) {
+  DEVMODE dm;
+  ZeroMemory(&dm, sizeof(dm));
+  dm.dmSize = sizeof(dm);
+  if (!EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm))
+    return;
+  if (flipped)
+    *flipped = (dm.dmDisplayOrientation == DMDO_270
+                || dm.dmDisplayOrientation == DMDO_180);

[Avi (use Gerrit), 2016/03/02 19:28:20]

Multiple-line if() blocks need {}.

[aleksandar.stojiljkovic, 2016/03/02 19:47:20]

Done.

+  if (landscape)
+    *landscape = (dm.dmPelsWidth > dm.dmPelsHeight);
+}
+
+void ScreenOrientationDelegateWin::Lock(
+    content::WebContents* web_contents,
+    blink::WebScreenOrientationLockType lock_orientation) {
+  ORIENTATION_PREFERENCE prefs = ORIENTATION_PREFERENCE_NONE;
+  bool landscape = true;
+  bool flipped = false;
+  switch (lock_orientation) {
+  case blink::WebScreenOrientationLockPortraitPrimary:
+    prefs = ORIENTATION_PREFERENCE_PORTRAIT;
+    break;
+  case blink::WebScreenOrientationLockPortraitSecondary:
+    prefs = ORIENTATION_PREFERENCE_PORTRAIT_FLIPPED;
+    break;
+  case blink::WebScreenOrientationLockLandscapePrimary:
+    prefs = ORIENTATION_PREFERENCE_LANDSCAPE;
+    break;
+  case blink::WebScreenOrientationLockLandscapeSecondary:
+    prefs = ORIENTATION_PREFERENCE_LANDSCAPE_FLIPPED;
+    break;
+  case blink::WebScreenOrientationLockPortrait:
+    GetCurrentDisplaySettings(&landscape, &flipped);
+    prefs = (flipped && !landscape) ? ORIENTATION_PREFERENCE_PORTRAIT_FLIPPED :
+                                      ORIENTATION_PREFERENCE_PORTRAIT;
+    break;
+  case blink::WebScreenOrientationLockLandscape:
+    GetCurrentDisplaySettings(&landscape, &flipped);
+    prefs = (flipped && landscape) ? ORIENTATION_PREFERENCE_LANDSCAPE_FLIPPED :
+                                     ORIENTATION_PREFERENCE_LANDSCAPE;
+    break;
+  case blink::WebScreenOrientationLockNatural:
+    GetCurrentDisplaySettings(&landscape, &flipped);
+    prefs = landscape ? ORIENTATION_PREFERENCE_LANDSCAPE :
+                        ORIENTATION_PREFERENCE_PORTRAIT;
+    break;
+  case blink::WebScreenOrientationLockAny:
+    GetCurrentDisplaySettings(&landscape, &flipped);
+    if (landscape) {
+      prefs = flipped ? ORIENTATION_PREFERENCE_LANDSCAPE_FLIPPED :
+                        ORIENTATION_PREFERENCE_LANDSCAPE;
+    } else {
+      prefs = flipped ? ORIENTATION_PREFERENCE_PORTRAIT_FLIPPED :
+                        ORIENTATION_PREFERENCE_PORTRAIT;
+    }
+    break;
+  case blink::WebScreenOrientationLockDefault:
+  default:
+    break;

[Avi (use Gerrit), 2016/03/02 19:28:20]

Switch statements need indenting.

https://google.github.io/styleguide/cppguide.html#Loops_and_Switch_Statements

[aleksandar.stojiljkovic, 2016/03/02 19:47:20]

Done.

+  }
+  SetDisplayAutoRotationPreferences(prefs);
+}
+
+bool ScreenOrientationDelegateWin::ScreenOrientationProviderSupported() {
+  AR_STATE autoRotationState;
+  ZeroMemory(&autoRotationState, sizeof(AR_STATE));
+  return (GetAutoRotationState(&autoRotationState)
+          && (autoRotationState == AR_ENABLED));
+}
+
+void ScreenOrientationDelegateWin::Unlock(
+    content::WebContents* web_contents) {
+  SetDisplayAutoRotationPreferences(ORIENTATION_PREFERENCE_NONE);
+}
+
+}  // namespace content