1 files changed, 129 insertions, 0 deletions
diff --git a/widget/android/ScreenHelperAndroid.cpp b/widget/android/ScreenHelperAndroid.cpp
new file mode 100644
index 0000000000..4242bfcdaa
--- /dev/null
+++ b/widget/android/ScreenHelperAndroid.cpp
@@ -0,0 +1,129 @@
+/* -*- 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 "mozilla/Atomics.h"
+#include "mozilla/java/GeckoAppShellWrappers.h"
+#include "mozilla/java/ScreenManagerHelperNatives.h"
+#include "mozilla/widget/ScreenManager.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 int32_t AddDisplay(int32_t aDisplayType, int32_t aWidth,
+                            int32_t aHeight, float aDensity) {
+    static Atomic<uint32_t> nextId;
+
+    uint32_t screenId = ++nextId;
+    NS_DispatchToMainThread(
+        NS_NewRunnableFunction(
+            "ScreenHelperAndroid::ScreenHelperSupport::AddDisplay",
+            [aDisplayType, aWidth, aHeight, aDensity, screenId] {
+              MOZ_ASSERT(NS_IsMainThread());
+
+              gHelper->AddScreen(
+                  screenId, static_cast<DisplayType>(aDisplayType),
+                  LayoutDeviceIntRect(0, 0, aWidth, aHeight), aDensity);
+            })
+            .take());
+    return screenId;
+  }
+
+  static void RemoveDisplay(int32_t aScreenId) {
+    NS_DispatchToMainThread(
+        NS_NewRunnableFunction(
+            "ScreenHelperAndroid::ScreenHelperSupport::RemoveDisplay",
+            [aScreenId] {
+              MOZ_ASSERT(NS_IsMainThread());
+
+              gHelper->RemoveScreen(aScreenId);
+            })
+            .take());
+  }
+};
+
+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();
+  RefPtr<Screen> screen = new Screen(bounds, bounds, depth, depth,
+                                     DesktopToLayoutDeviceScale(density),
+                                     CSSToLayoutDeviceScale(1.0f), dpi);
+  return screen.forget();
+}
+
+ScreenHelperAndroid::ScreenHelperAndroid() {
+  MOZ_ASSERT(!gHelper);
+  gHelper = this;
+
+  ScreenHelperSupport::Base::Init();
+
+  Refresh();
+}
+
+ScreenHelperAndroid::~ScreenHelperAndroid() { gHelper = nullptr; }
+
+/* static */
+ScreenHelperAndroid* ScreenHelperAndroid::GetSingleton() { return gHelper; }
+
+void ScreenHelperAndroid::Refresh() {
+  mScreens.Remove(0);
+
+  AutoTArray<RefPtr<Screen>, 1> screenList;
+  RefPtr<Screen> screen = MakePrimaryScreen();
+  if (screen) {
+    mScreens.Put(0, screen);
+  }
+
+  for (auto iter = mScreens.ConstIter(); !iter.Done(); iter.Next()) {
+    screenList.AppendElement(iter.Data());
+  }
+
+  ScreenManager& manager = ScreenManager::GetSingleton();
+  manager.Refresh(std::move(screenList));
+}
+
+void ScreenHelperAndroid::AddScreen(uint32_t aScreenId,
+                                    DisplayType aDisplayType,
+                                    LayoutDeviceIntRect aRect, float aDensity) {
+  MOZ_ASSERT(aScreenId > 0);
+  MOZ_ASSERT(!mScreens.Get(aScreenId, nullptr));
+
+  RefPtr<Screen> screen =
+      new Screen(aRect, aRect, 24, 24, DesktopToLayoutDeviceScale(aDensity),
+                 CSSToLayoutDeviceScale(1.0f), 160.0f);
+
+  mScreens.Put(aScreenId, screen);
+  Refresh();
+}
+
+void ScreenHelperAndroid::RemoveScreen(uint32_t aScreenId) {
+  mScreens.Remove(aScreenId);
+  Refresh();
+}
+
+already_AddRefed<Screen> ScreenHelperAndroid::ScreenForId(uint32_t aScreenId) {
+  RefPtr<Screen> screen = mScreens.Get(aScreenId);
+  return screen.forget();
+}