Add m-esr52 at 52.6.0

1 files changed, 218 insertions, 0 deletions

diff --git a/widget/nsScreenManagerProxy.cpp b/widget/nsScreenManagerProxy.cpp
new file mode 100644
index 000000000..18f400ff5
--- /dev/null
+++ b/widget/nsScreenManagerProxy.cpp
@@ -0,0 +1,218 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * 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 "mozilla/Unused.h"
+#include "mozilla/dom/ContentChild.h"
+#include "nsScreenManagerProxy.h"
+#include "nsServiceManagerUtils.h"
+#include "nsContentUtils.h"
+#include "nsIAppShell.h"
+#include "nsIScreen.h"
+#include "nsIScreenManager.h"
+#include "nsWidgetsCID.h"
+
+static NS_DEFINE_CID(kAppShellCID, NS_APPSHELL_CID);
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::widget;
+
+NS_IMPL_ISUPPORTS(nsScreenManagerProxy, nsIScreenManager)
+
+nsScreenManagerProxy::nsScreenManagerProxy()
+  : mNumberOfScreens(-1)
+  , mSystemDefaultScale(1.0)
+  , mCacheValid(true)
+  , mCacheWillInvalidate(false)
+{
+  bool success = false;
+  Unused << ContentChild::GetSingleton()->SendPScreenManagerConstructor(
+                                            this,
+                                            &mNumberOfScreens,
+                                            &mSystemDefaultScale,
+                                            &success);
+
+  if (!success) {
+    // We're in bad shape. We'll return the default values, but we'll basically
+    // be lying.
+    NS_WARNING("Setting up communications with the parent nsIScreenManager failed.");
+  }
+
+  InvalidateCacheOnNextTick();
+
+  // nsScreenManagerProxy is a service, which will always have a reference
+  // held to it by the Component Manager once the service is requested.
+  // However, nsScreenManagerProxy also implements PScreenManagerChild, and
+  // that means that the manager of the PScreenManager protocol (PContent
+  // in this case) needs to know how to deallocate this actor. We AddRef here
+  // so that in the event that PContent tries to deallocate us either before
+  // or after process shutdown, we don't try to do a double-free.
+  AddRef();
+}
+
+/**
+ * nsIScreenManager
+ **/
+
+NS_IMETHODIMP
+nsScreenManagerProxy::GetPrimaryScreen(nsIScreen** outScreen)
+{
+  InvalidateCacheOnNextTick();
+
+  if (!mPrimaryScreen) {
+    ScreenDetails details;
+    bool success = false;
+    Unused << SendGetPrimaryScreen(&details, &success);
+    if (!success) {
+      return NS_ERROR_FAILURE;
+    }
+
+    mPrimaryScreen = new ScreenProxy(this, details);
+  }
+  NS_ADDREF(*outScreen = mPrimaryScreen);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsScreenManagerProxy::ScreenForId(uint32_t aId, nsIScreen** outScreen)
+{
+  // At this time, there's no need for child processes to query for
+  // screens by ID.
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsScreenManagerProxy::ScreenForRect(int32_t inLeft,
+                                    int32_t inTop,
+                                    int32_t inWidth,
+                                    int32_t inHeight,
+                                    nsIScreen** outScreen)
+{
+  bool success = false;
+  ScreenDetails details;
+  Unused << SendScreenForRect(inLeft, inTop, inWidth, inHeight, &details, &success);
+  if (!success) {
+    return NS_ERROR_FAILURE;
+  }
+
+  RefPtr<ScreenProxy> screen = new ScreenProxy(this, details);
+  NS_ADDREF(*outScreen = screen);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsScreenManagerProxy::ScreenForNativeWidget(void* aWidget,
+                                            nsIScreen** outScreen)
+{
+  // Because ScreenForNativeWidget can be called numerous times
+  // indirectly from content via the DOM Screen API, we cache the
+  // results for this tick of the event loop.
+  TabChild* tabChild = static_cast<TabChild*>(aWidget);
+
+  // Enumerate the cached screen array, looking for one that has
+  // the TabChild that we're looking for...
+  for (uint32_t i = 0; i < mScreenCache.Length(); ++i) {
+      ScreenCacheEntry& curr = mScreenCache[i];
+      if (curr.mTabChild == aWidget) {
+          NS_ADDREF(*outScreen = static_cast<nsIScreen*>(curr.mScreenProxy));
+          return NS_OK;
+      }
+  }
+
+  // Never cached this screen, so we have to ask the parent process
+  // for it.
+  bool success = false;
+  ScreenDetails details;
+  Unused << SendScreenForBrowser(tabChild->GetTabId(), &details, &success);
+  if (!success) {
+    return NS_ERROR_FAILURE;
+  }
+
+  ScreenCacheEntry newEntry;
+  RefPtr<ScreenProxy> screen = new ScreenProxy(this, details);
+
+  newEntry.mScreenProxy = screen;
+  newEntry.mTabChild = tabChild;
+
+  mScreenCache.AppendElement(newEntry);
+
+  NS_ADDREF(*outScreen = screen);
+
+  InvalidateCacheOnNextTick();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsScreenManagerProxy::GetNumberOfScreens(uint32_t* aNumberOfScreens)
+{
+  if (!EnsureCacheIsValid()) {
+    return NS_ERROR_FAILURE;
+  }
+
+  *aNumberOfScreens = mNumberOfScreens;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsScreenManagerProxy::GetSystemDefaultScale(float *aSystemDefaultScale)
+{
+  if (!EnsureCacheIsValid()) {
+    return NS_ERROR_FAILURE;
+  }
+
+  *aSystemDefaultScale = mSystemDefaultScale;
+  return NS_OK;
+}
+
+bool
+nsScreenManagerProxy::EnsureCacheIsValid()
+{
+  if (mCacheValid) {
+    return true;
+  }
+
+  bool success = false;
+  // Kick off a synchronous IPC call to the parent to get the
+  // most up-to-date information.
+  Unused << SendRefresh(&mNumberOfScreens, &mSystemDefaultScale, &success);
+  if (!success) {
+    NS_WARNING("Refreshing nsScreenManagerProxy failed in the parent process.");
+    return false;
+  }
+
+  mCacheValid = true;
+
+  InvalidateCacheOnNextTick();
+  return true;
+}
+
+void
+nsScreenManagerProxy::InvalidateCacheOnNextTick()
+{
+  if (mCacheWillInvalidate) {
+    return;
+  }
+
+  mCacheWillInvalidate = true;
+
+  nsContentUtils::RunInStableState(NewRunnableMethod(this, &nsScreenManagerProxy::InvalidateCache));
+}
+
+void
+nsScreenManagerProxy::InvalidateCache()
+{
+  mCacheValid = false;
+  mCacheWillInvalidate = false;
+
+  if (mPrimaryScreen) {
+    mPrimaryScreen = nullptr;
+  }
+  for (int32_t i = mScreenCache.Length() - 1; i >= 0; --i) {
+    mScreenCache.RemoveElementAt(i);
+  }
+}
+