1 files changed, 70 insertions, 0 deletions
diff --git a/widget/android/ScreenHelperAndroid.cpp b/widget/android/ScreenHelperAndroid.cpp
new file mode 100644
index 0000000000..33c91fe6e0
--- /dev/null
+++ b/widget/android/ScreenHelperAndroid.cpp
@@ -0,0 +1,70 @@
+/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set sw=2 ts=4 expandtab:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ScreenHelperAndroid.h"
+#include "AndroidRect.h"
+#include "nsThreadUtils.h"
+
+#include <mozilla/jni/Refs.h>
+
+#include "AndroidVsync.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/java/GeckoAppShellWrappers.h"
+#include "mozilla/java/ScreenManagerHelperNatives.h"
+#include "mozilla/widget/ScreenManager.h"
+#include "nsXULAppAPI.h"
+
+using namespace mozilla;
+using namespace mozilla::widget;
+
+static ScreenHelperAndroid* gHelper = nullptr;
+
+class ScreenHelperAndroid::ScreenHelperSupport final
+    : public java::ScreenManagerHelper::Natives<ScreenHelperSupport> {
+ public:
+  typedef java::ScreenManagerHelper::Natives<ScreenHelperSupport> Base;
+
+  static void RefreshScreenInfo() { gHelper->Refresh(); }
+};
+
+static already_AddRefed<Screen> MakePrimaryScreen() {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  java::sdk::Rect::LocalRef rect = java::GeckoAppShell::GetScreenSize();
+  LayoutDeviceIntRect bounds = LayoutDeviceIntRect(
+      rect->Left(), rect->Top(), rect->Width(), rect->Height());
+  uint32_t depth = java::GeckoAppShell::GetScreenDepth();
+  float density = java::GeckoAppShell::GetDensity();
+  float dpi = java::GeckoAppShell::GetDpi();
+  auto orientation =
+      hal::ScreenOrientation(java::GeckoAppShell::GetScreenOrientation());
+  uint16_t angle = java::GeckoAppShell::GetScreenAngle();
+  float refreshRate = java::GeckoAppShell::GetScreenRefreshRate();
+  return MakeAndAddRef<Screen>(bounds, bounds, depth, depth, refreshRate,
+                               DesktopToLayoutDeviceScale(density),
+                               CSSToLayoutDeviceScale(1.0f), dpi,
+                               Screen::IsPseudoDisplay::No, orientation, angle);
+}
+
+ScreenHelperAndroid::ScreenHelperAndroid() {
+  MOZ_ASSERT(!gHelper);
+  gHelper = this;
+
+  ScreenHelperSupport::Base::Init();
+
+  Refresh();
+}
+
+ScreenHelperAndroid::~ScreenHelperAndroid() { gHelper = nullptr; }
+
+void ScreenHelperAndroid::Refresh() {
+  AutoTArray<RefPtr<Screen>, 1> screens;
+  screens.AppendElement(MakePrimaryScreen());
+  ScreenManager::Refresh(std::move(screens));
+
+  if (RefPtr<AndroidVsync> vsync = AndroidVsync::GetInstance()) {
+    vsync->OnMaybeUpdateRefreshRate();
+  }
+}