1 files changed, 106 insertions, 0 deletions
diff --git a/dom/ipc/TabContext.cpp b/dom/ipc/TabContext.cpp
new file mode 100644
index 0000000000..4344ec221a
--- /dev/null
+++ b/dom/ipc/TabContext.cpp
@@ -0,0 +1,106 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/dom/TabContext.h"
+#include "mozilla/dom/PTabContext.h"
+#include "mozilla/dom/BrowserParent.h"
+#include "mozilla/dom/BrowserChild.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "nsServiceManagerUtils.h"
+
+using namespace mozilla::dom::ipc;
+using namespace mozilla::layout;
+
+namespace mozilla::dom {
+
+TabContext::TabContext()
+    : mInitialized(false),
+      mChromeOuterWindowID(0),
+      mMaxTouchPoints(0) {}
+
+uint64_t TabContext::ChromeOuterWindowID() const {
+  return mChromeOuterWindowID;
+}
+
+bool TabContext::SetTabContext(const TabContext& aContext) {
+  NS_ENSURE_FALSE(mInitialized, false);
+
+  *this = aContext;
+  mInitialized = true;
+
+  return true;
+}
+
+bool TabContext::UpdateTabContextAfterSwap(const TabContext& aContext) {
+  // This is only used after already initialized.
+  MOZ_ASSERT(mInitialized);
+
+  // The only permissable changes are to mChromeOuterWindowID.  All other fields
+  // must match for the change to be accepted.
+
+  mChromeOuterWindowID = aContext.mChromeOuterWindowID;
+  return true;
+}
+
+bool TabContext::SetTabContext(uint64_t aChromeOuterWindowID,
+                               uint32_t aMaxTouchPoints) {
+  NS_ENSURE_FALSE(mInitialized, false);
+
+  mInitialized = true;
+  mChromeOuterWindowID = aChromeOuterWindowID;
+  mMaxTouchPoints = aMaxTouchPoints;
+  return true;
+}
+
+IPCTabContext TabContext::AsIPCTabContext() const {
+  return IPCTabContext(
+      FrameIPCTabContext(mChromeOuterWindowID, mMaxTouchPoints));
+}
+
+MaybeInvalidTabContext::MaybeInvalidTabContext(const IPCTabContext& aParams)
+    : mInvalidReason(nullptr) {
+  uint64_t chromeOuterWindowID = 0;
+  uint32_t maxTouchPoints = 0;
+
+  switch (aParams.type()) {
+    case IPCTabContext::TPopupIPCTabContext: {
+      const PopupIPCTabContext& ipcContext = aParams.get_PopupIPCTabContext();
+
+      chromeOuterWindowID = ipcContext.chromeOuterWindowID();
+      break;
+    }
+    case IPCTabContext::TFrameIPCTabContext: {
+      const FrameIPCTabContext& ipcContext = aParams.get_FrameIPCTabContext();
+
+      chromeOuterWindowID = ipcContext.chromeOuterWindowID();
+      maxTouchPoints = ipcContext.maxTouchPoints();
+      break;
+    }
+    default: {
+      MOZ_CRASH();
+    }
+  }
+
+  if (!mTabContext.SetTabContext(chromeOuterWindowID, maxTouchPoints)) {
+    mInvalidReason = "Couldn't initialize TabContext.";
+  }
+}
+
+bool MaybeInvalidTabContext::IsValid() { return mInvalidReason == nullptr; }
+
+const char* MaybeInvalidTabContext::GetInvalidReason() {
+  return mInvalidReason;
+}
+
+const TabContext& MaybeInvalidTabContext::GetTabContext() {
+  if (!IsValid()) {
+    MOZ_CRASH("Can't GetTabContext() if !IsValid().");
+  }
+
+  return mTabContext;
+}
+
+}  // namespace mozilla::dom